TY - JOUR AU - Kara, Goknur AU - Ozpolat, Bulent TI - SPIONs: Superparamagnetic iron oxide-based nanoparticles for the delivery of microRNAi-therapeutics in cancer JF - BIOMEDICAL MICRODEVICES J2 - BIOMED MICRODEVICES VL - 26 PY - 2024 IS - 1 PG - 15 SN - 1387-2176 DO - 10.1007/s10544-024-00698-y UR - https://m2.mtmt.hu/api/publication/34634659 ID - 34634659 LA - English DB - MTMT ER - TY - JOUR AU - Jara, Denisse AU - Veiga, Lionel S. AU - Garate, Octavio AU - Ybarra, Gabriel AU - Tancredi, Pablo TI - Mass-production of water-based ferrofluids capable of developing spike-like structures JF - JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS J2 - J MAGN MAGN MATER VL - 572 PY - 2023 PG - 8 SN - 0304-8853 DO - 10.1016/j.jmmm.2023.170622 UR - https://m2.mtmt.hu/api/publication/33885128 ID - 33885128 AB - Ferrofluids are among the most popular and engaging materials related to the nanotechnology field, with ap-plications ranging from studies of basic science phenomena to educational and outreach activities. Therefore, there is a continuous interest in the synthesis strategies used to fabricate these systems, especially those that can lead to simple procedures able to be reproduced under a wide spectrum of laboratory conditions. The ferrofluids described in this work are systems composed of iron oxide nanoparticles synthesized by the coprecipitation method and functionalized with citrate molecules to ensure the dispersion in an aqueous me-dium. During the experimental work we evaluated different operations and synthesis conditions, in order to arrive to a unique procedure that optimizes the functionalization results and the scaling potential. The optimized synthesis route has two main features that are worth to highlight. The first is the possibility of using readily available commercial products as chemical precursors; the second is the overall reduction of the procedure difficulties, as we show that several operations that are usually used in similar reports can be avoided, such as sonication, centrifugation, dialysis, inert atmospheres of Ar/N2 or heating of large volumes of liquid. Both fea-tures can be included in the synthesis route without compromising the ferrofluid quality. The procedure can be used to successfully prepare nearly 30 g of functionalized nanoparticles per synthesis batch. Furthermore, this production has the potential to increase due to the absence of significant limitations in the scaling process. We show that the synthesized nanoparticles can produce a stable colloid even at extremely high concentrations (above 50% wt), leading to the formation of ferrofluids that can develop static peak patterns, known as Rose-nsweig instabilities, when exposed to an external magnetic field. In turn, we show that the extent of these dis-turbances can be modified both with the concentration of nanoparticles and with the surface tension of the ferrofluid, as expected for this type of system. LA - English DB - MTMT ER - TY - JOUR AU - Li, Decai AU - Li, Yanwen AU - Li, Zixian AU - Wang, Yuming TI - Theory analyses and applications of magnetic fluids in sealing JF - FRICTION J2 - FRICTION PY - 2023 PG - 23 SN - 2223-7690 DO - 10.1007/s40544-022-0676-8 UR - https://m2.mtmt.hu/api/publication/33931149 ID - 33931149 AB - Magnetic fluids are the suspensions composed of magnetic nanoparticles, surfactants, and non-magnetic carrier liquids. Magnetic fluids are widely used in various fields, especially in sealing, because of their excellent features, including rapid magnetic response, flexible flow ability, tunable magneto-viscous effect, and reliable self-repairing capability. Here, we provide an in-depth, comprehensive insight into the theoretical analyses and diverse applications of magnetic fluids in sealing from three categories: static sealing, rotary sealing, and reciprocating sealing. We summarize the magnetic fluid sealing mechanisms and the development of magnetic fluid seals from 1960s to the present, particularly focusing on the recent progress of magnetic fluid seals. Although magnetic fluid sealing technology has been commercialized and industrialized, many difficulties still exist in its applications. At the end of the review, the present challenges and future prospects in the progress of magnetic fluid seals are also outlined. LA - English DB - MTMT ER - TY - JOUR AU - Rabbani, Yahya AU - Hajinajaf, Nima AU - Shariaty-Niassar, Mojtaba TI - The effect of microparticles/nanoparticles surface modification on the magnetorheological fluid properties: A review JF - JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES J2 - J INTEL MAT SYST STR PY - 2023 PG - 24 SN - 1045-389X DO - 10.1177/1045389X221147667 UR - https://m2.mtmt.hu/api/publication/33931150 ID - 33931150 AB - Magnetorheological fluids are considered smart materials since their properties change significantly when exposed to a magnetic field, making them interesting for a variety of industries. These fluids are composed of three main components: dispersed particles, carrier fluid, and additives. The latter of which has been the subject of various studies. Therefore, this paper reviews the characteristics and parameters of the particles dispersed in additives and their impact on fluid rheological properties and stability. Also, the surface modification of magnetic and non-magnetic micro and nanoparticles have been investigated. A detailed review of previous studies has been carried out to examine the effects of various parameters such as types of coatings, coating layers, coating thickness, density change, and change in magnetic saturation, on the stability and rheological properties of MR fluids. LA - English DB - MTMT ER - TY - JOUR AU - Upadhyay, R.V. AU - Raj, K. AU - Parekh, K.H. AU - Pisuwala, M.S. TI - Physicochemical properties of mixed oil-based and bilayer-stabilized magnetic fluids JF - CHEMICAL PAPERS / CHEMICKÉ ZVESTI J2 - CHEM PAP / CHEM ZVESTI VL - 77 PY - 2023 SP - 2871 EP - 2883 PG - 13 SN - 2585-7290 DO - 10.1007/s11696-023-02672-z UR - https://m2.mtmt.hu/api/publication/33587864 ID - 33587864 LA - English DB - MTMT ER - TY - JOUR AU - Adesina, Abiola AU - Adeniyi, Omotayo AU - Mashazi, Philani TI - Nanomagnet Bioconjugates with anti-CRP Polyclonal Antibodies as Nanobioprobes for Enhanced Impedimetric Detection of CRP JF - ELECTROANALYSIS J2 - ELECTROANAL PY - 2022 PG - 12 SN - 1040-0397 DO - 10.1002/elan.202200059 UR - https://m2.mtmt.hu/api/publication/33394612 ID - 33394612 AB - Selective purification of biological materials for their detection in complex sample matrix is a general challenge for many researchers working in the field of diagnostics. Magnetic nanoparticles functionalized with biological molecules that impart biomolecular selectivity are therefore of major interest as capture probes thus allowing for magnetic separations. Nanoparticles can also be used for the enhanced detection of biomarkers. In this work, an ultrasensitive sandwich-based impedimetric immunosensor was fabricated for the detection of C-reactive protein antigen (CRPAg). Stable and oriented immobilization of anti-CRP monoclonal antibody was achieved onto electrografted phenylethylamine derivatized with succinic anhydride and phenylboronic acid via carbodiimide chemistry. The detection of CRPAg was achieved using Electrochemical Impedance Spectroscopy (EIS). The enhancement of the impedance charge-transfer resistance (R-CT) signal was achieved using the sandwich approach. The anti-CRP polyclonal antibody was immobilized in an oriented manner onto magnetic nanoparticles functionalized with phenylboronic acid. The increase in the change in charge-transfer resistance (Delta R-CT) values was linearly proportional to the concentration of CRPAg in the range 10 to 200 ng mL(-1) covering the clinical range for CRPAg detection and with a detection limit of 0.34 ng mL(-1). LA - English DB - MTMT ER - TY - JOUR AU - Bernad, Sandor I. AU - Socoliuc, Vlad AU - Susan-Resiga, Daniela AU - Crăciunescu, Izabell AU - Turcu, Rodica AU - Csákiné Tombácz, Etelka AU - Vékás, Ladislau AU - Ioncica, Maria C. AU - Bernad, Elena S. TI - Magnetoresponsive Functionalized Nanocomposite Aggregation Kinetics and Chain Formation at the Targeted Site during Magnetic Targeting JF - PHARMACEUTICS J2 - PHARMACEUTICS VL - 14 PY - 2022 IS - 9 SN - 1999-4923 DO - 10.3390/pharmaceutics14091923 UR - https://m2.mtmt.hu/api/publication/33098853 ID - 33098853 N1 - ISSN:1999-4923 AB - Drug therapy for vascular disease has been promoted to inhibit angiogenesis in atherosclerotic plaques and prevent restenosis following surgical intervention. This paper investigates the arterial depositions and distribution of PEG-functionalized magnetic nanocomposite clusters (PEG_MNCs) following local delivery in a stented artery model in a uniform magnetic field produced by a regionally positioned external permanent magnet; also, the PEG_MNCs aggregation or chain formation in and around the implanted stent. The central concept is to employ one external permanent magnet system, which produces enough magnetic field to magnetize and guide the magnetic nanoclusters in the stented artery region. At room temperature (25 °C), optical microscopy of the suspension model’s aggregation process was carried out in the external magnetic field. According to the optical microscopy pictures, the PEG_MNC particles form long linear aggregates due to dipolar magnetic interactions when there is an external magnetic field. During magnetic particle targeting, 20 mL of the model suspensions are injected (at a constant flow rate of 39.6 mL/min for the period of 30 s) by the syringe pump in the mean flow (flow velocity is Um = 0.25 m/s, corresponding to the Reynolds number of Re = 232) into the stented artery model. The PEG_MNC clusters are attracted by the magnetic forces (generated by the permanent external magnet) and captured around the stent struts and the bottom artery wall before and inside the implanted stent. The colloidal interaction among the MNC clusters was investigated by calculating the electrostatic repulsion, van der Waals and magnetic dipole-dipole energies. The current work offers essential details about PEG_MNCs aggregation and chain structure development in the presence of an external magnetic field and the process underlying this structure formation. LA - English DB - MTMT ER - TY - JOUR AU - Dukhopelnykov, E. V. AU - Blyzniuk, Yu. N. AU - Skuratovska, A. A. AU - Bereznyak, E. G. AU - Gladkovskaya, N. A. TI - Interaction of doxorubicin delivered by superparamagnetic iron oxide nanoparticles with DNA JF - COLLOIDS AND SURFACES B: BIOINTERFACES J2 - COLLOID SURFACE B VL - 219 PY - 2022 PG - 7 SN - 0927-7765 DO - 10.1016/j.colsurfb.2022.112815 UR - https://m2.mtmt.hu/api/publication/33931151 ID - 33931151 AB - We studied the interaction of superparamagnetic iron oxide nanoparticles (SPIONs), covered by trisodium citrate, with doxorubicin (DOX) and DNA using the spectrophotometric method. We calculated the binding parameters in the binary (DOX-SPION and SPION-DNA) and the ternary (DOX-SPION-DNA) systems. Our studies showed that the nanoparticles do not interact with DNA. We also observed that one nanoparticle loads rather a large number of DOX molecules with a quite high binding constant value (k(DOX-SPION) = 1.2 x 10(4) M-1). The DNA addition to the DOX-SPION system induces DOX release from the SPION surface and the formation of DOX-DNA complexes. The presence of nanoparticles has almost no effect on the constant of doxorubicin binding to DNA (k(DOX-DNA) approximate to 3 x 10(4) M-1). At high DNA concentrations, almost all DOX molecules bind to DNA. Accordingly, the use of SPIONs as DOX carriers does not require an increased drug dose to achieve a therapeutic effect. Thus, SPIONs are perspective nanocarriers for DOX delivery. LA - English DB - MTMT ER - TY - JOUR AU - Honecker, D. AU - Bersweiler, M. AU - Erokhin, S. AU - Berkov, D. AU - Chesnel, K. AU - Venero, D.A. AU - Qdemat, A. AU - Disch, S. AU - Jochum, J.K. AU - Michels, A. AU - Bender, P. TI - Using small-angle scattering to guide functional magnetic nanoparticle design JF - NANOSCALE ADVANCES J2 - NANOSCALE ADV VL - 4 PY - 2022 IS - 4 SP - 1026 EP - 1059 PG - 34 SN - 2516-0230 DO - 10.1039/d1na00482d UR - https://m2.mtmt.hu/api/publication/32841133 ID - 32841133 N1 - Export Date: 24 January 2024 LA - English DB - MTMT ER - TY - JOUR AU - Socoliuc, V. AU - Avdeev, M. V. AU - Kuncser, V. AU - Turcu, Rodica AU - Csákiné Tombácz, Etelka AU - Vékás, L. TI - Ferrofluids and bio-ferrofluids: looking back and stepping forward JF - NANOSCALE J2 - NANOSCALE VL - 14 PY - 2022 IS - 13 SP - 4786 EP - 4886 PG - 101 SN - 2040-3364 DO - 10.1039/D1NR05841J UR - https://m2.mtmt.hu/api/publication/32767794 ID - 32767794 N1 - Romanian Academy - Timisoara Branch, Laboratory of Magnetic Fluids, Center for Fundamental and Advanced Technical Research, Mihai Viteazu Ave. 24, Timisoara, 300223, Romania Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Joliot-Curie Str. 6, Moscow Reg., Dubna, 141980, Russian Federation National Institute of Materials Physics, Bucharest-Magurele, 77125, Romania National Institute for Research and Development of Isotopic and Molecular Technologies (INCDTIM), Donat Str. 67-103, Cluj-Napoca, 400293, Romania University of Szeged, Department of Food Engineering, Faculty of Engineering, Moszkvai krt. 5-7, Szeged, H-6725, Hungary University of Pannonia - Soós Ernő Water Technology Research and Development Center, Zrínyi M. str. 18, Nagykanizsa, H-8800, Hungary Politehnica University of Timisoara, Research Center for Complex Fluids Systems Engineering, Mihai Viteazul Ave. 1, Timisoara, 300222, Romania Cited By :12 Export Date: 24 March 2023 Correspondence Address: Avdeev, M.V.; Frank Laboratory of Neutron Physics, Joliot-Curie Str. 6, Moscow Reg., Russian Federation; email: avd@dubna.ru Correspondence Address: Tombácz, E.; University of Szeged, Moszkvai krt. 5-7, Hungary; email: E.Tombacz@chem.u-szeged.hu Correspondence Address: Vékás, L.; Romanian Academy - Timisoara Branch, Mihai Viteazu Ave. 24, Romania; email: vekas.ladislau@gmail.com LA - English DB - MTMT ER - TY - JOUR AU - Vasilescu, Corina AU - Marc, Simona AU - Hulka, Iosif AU - Paul, Cristina TI - Enhancement of the Catalytic Performance and Operational Stability of Sol-Gel-Entrapped Cellulase by Tailoring the Matrix Structure and Properties JF - GELS (BASEL) J2 - GELS-BASEL VL - 8 PY - 2022 IS - 10 PG - 28 SN - 2310-2861 DO - 10.3390/gels8100626 UR - https://m2.mtmt.hu/api/publication/33224839 ID - 33224839 AB - Commercial cellulase Cellic CTec2 was immobilized by the entrapment technique in sol-gel matrices, and sol-gel entrapment with deposition onto magnetic nanoparticles, using binary or ternary systems of silane precursors with alkyl- or aryl-trimethoxysilanes, at different molar ratios. Appropriate tailoring of the sol-gel matrix allowed for the enhancement of the catalytic efficiency of the cellulase biocatalyst, which was then evaluated in the hydrolysis reaction of Avicel microcrystalline cellulose. A correlation between the catalytic activity with the properties of the sol-gel matrix of the nanobiocatalysts was observed using several characterization methods: scanning electron microscopy (SEM), fluorescence microscopy (FM), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA/DTA). The homogeneous distribution of the enzymes in the sol-gel matrix and the mass loss profile as a function of temperature were highlighted. The influence of temperature and pH of the reaction medium on the catalytic performance of the nanobiocatalysts as well as the operational stability under optimized reaction conditions were also investigated; the immobilized biocatalysts proved their superiority in comparison to the native cellulase. The magnetic cellulase biocatalyst with the highest efficiency was reused in seven successive batch hydrolysis cycles of microcrystalline cellulose with remanent activity values that were over 40%, thus we obtained promising results for scaling-up the process. LA - English DB - MTMT ER - TY - JOUR AU - Yin, Wei AU - Liu, Meng AU - Wang, Yu-Han AU - Huang, Yang AU - Zhao, Tian-Lei AU - Yao, Qi-Zhi AU - Fu, Sheng-Quan AU - Zhou, Gen-Tao TI - Fe3O4-Mg(OH)(2) nanocomposite as a scavenger for silver nanoparticles: Rational design, facile synthesis, and enhanced performance JF - ENVIRONMENTAL RESEARCH J2 - ENVIRON RES VL - 212 PY - 2022 PG - 11 SN - 0013-9351 DO - 10.1016/j.envres.2022.113292 UR - https://m2.mtmt.hu/api/publication/33394615 ID - 33394615 AB - Silver nanoparticles (AgNPs) are considered as emerging contaminants because of their high toxicity and increasing environmental impact. Removal of discharged AgNPs from water is crucial for mitigating the health and environmental risks. However, developing facile, economical, and environment-friendly approaches remains challenging. Herein, an Fe3O4-Mg(OH)(2 )nanocomposite, as a novel magnetic scavenger for AgNPs, was prepared by loading Fe3O4 nanoparticles on Mg(OH)(2) nanoplates in a one-pot synthesis. Batch removal experiments revealed that the maximum removal capacities for the two model AgNPs (citrate-or polyvinylpyrrolidone-coated AgNPs) were 476 and 442 mg/g, respectively, corresponding to partition coefficients 8.03 and 4.89 mg/g/mu M. Removal feasibilities over a wide pH range of 5-11 and in real water matrices and scavenger reusability with five cycles were also confirmed. Both Fe(3)O(4 & nbsp;)and Mg(OH)(2) components contributed to the removal; however, their nanocomposites exhibited an enhanced performance because of the high specific surface area and pore volume. Chemical adsorption and electrostatic attraction between the coatings on the AgNPs and the two components in the nanocomposite was considered to be responsible for the removal. Overall, the facile synthesis, convenient magnetic separation, and high removal performance highlight the great potential of the Fe3O4-Mg(OH)(2) nanocomposite for practical applications. LA - English DB - MTMT ER - TY - JOUR AU - Căpraru, A. AU - Moacă, E.-A. AU - Păcurariu, C. AU - Ianoş, R. AU - Lazău, R. AU - Barbu-Tudoran, L. TI - Development and characterization of magnetic iron oxide nanoparticles using microwave for the combustion reaction ignition, as possible candidates for biomedical applications JF - POWDER TECHNOLOGY J2 - POWDER TECHNOL VL - 394 PY - 2021 SP - 1026 EP - 1038 PG - 13 SN - 0032-5910 DO - 10.1016/j.powtec.2021.08.093 UR - https://m2.mtmt.hu/api/publication/32242054 ID - 32242054 N1 - Politehnica University Timisoara, Faculty of Industrial Chemistry and Environmental Engineering, 6th Pîrvan Blv., Timisoara, RO-300223, Romania “Victor Babes” University of Medicine and Pharmacy Timisoara, Faculty of Pharmacy, 2nd Eftimie Murgu Square, Timisoara, RO-300041, Romania Research Centre for Pharmaco-Toxicological Evaluation, “Victor Babeș” University of Medicine and Pharmacy, 2nd Eftimie Murgu Square, Timișoara, 300041, Romania Electron Microscopy Laboratory “Prof. C. Craciun”, Faculty of Biology & Geology, “Babes-Bolyai” University, 5-7 Clinicilor Street, Cluj-Napoca, RO-400006, Romania Electron Microscopy Integrated Laboratory, National Institute for R&D of Isotopic and Molecular Technologies, 67-103 Donat Street, Cluj-Napoca, RO-400293, Romania Export Date: 27 September 2021 CODEN: POTEB Correspondence Address: Moacă, E.-A.; “Victor Babes” University of Medicine and Pharmacy Timisoara, 2nd Eftimie Murgu Square, Romania; email: alina.moaca@umft.ro Correspondence Address: Păcurariu, C.; Politehnica University Timisoara, 6th Pîrvan Blv., Romania; email: cornelia.pacurariu@upt.ro LA - English DB - MTMT ER - TY - JOUR AU - Chen, Fang AU - Ilyas, Nasir AU - Liu, Xiaobing AU - Li, Zhenggui AU - Yan, Shengnan AU - Fu, Hao TI - Size Effect of Fe3O4 Nanoparticles on Magnetism and Dispersion Stability of Magnetic Nanofluid JF - FRONTIERS IN ENERGY RESEARCH J2 - FRONT ENERGY RES VL - 9 PY - 2021 PG - 9 SN - 2296-598X DO - 10.3389/fenrg.2021.780008 UR - https://m2.mtmt.hu/api/publication/33394621 ID - 33394621 AB - It is well known that magnetic nanofluids are widely applied in various fields ranging from heat transfer to miniature cooling, and from damping to sealing, due to the mobility and magnetism under magnetic field. Herein, the PFPE-oil based magnetic nanofluids with superior magnetization and dispersion stability were obtained via regulating reaction temperature. The structures of particles were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The size effects of particles on the magnetism and coating effect of particles, and on the stability and saturation magnetization of the fluids were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM) and density instrument, respectively. The results indicate that the impurity phase FeOOH only appear in the sample prepared at 18 degrees C and the average size of Fe3O4 nanoparticles reduces from 120 to 20 nm with raising reaction temperature. The saturation magnetization of Fe3O4 particles increases firstly and then reduces with increasing particle size, which is affected by the thickness of magnetic dead layer and impurity phase FeOOH. The Fe3O4 particles could be chemically coated by PFPE-acids, and the coated mass is a little affected by particle size. The stability of the nanofluids lowers while the saturation magnetization increases firstly and then decrease with increasing particle size. At reaction temperature of 60 degrees C, Fe3O4 particles of 25 nm and the nanofluids with superior stability and saturation magnetization were obtained. Our results indicate that the control of nanoparticles size by regulating reaction temperature can be a useful strategy for preparing magnetic nanofluids with desirable properties for various potential applications. LA - English DB - MTMT ER - TY - JOUR AU - Eliseev, A.A. AU - Trusov, L.A. AU - Anokhin, E.O. AU - Chumakov, A.P. AU - Korolev, V.V. AU - Sleptsova, A.E. AU - Boesecke, P. AU - Pryakhina, V.I. AU - Shur, V.Y. AU - Kazin, P.E. AU - Eliseev, A.A. TI - Tunable order in colloids of hard magnetic hexaferrite nanoplatelets JF - NANO RESEARCH J2 - NANO RES VL - 1 PY - 2021 SN - 1998-0124 DO - 10.1007/s12274-021-3572-z UR - https://m2.mtmt.hu/api/publication/32242056 ID - 32242056 N1 - Faculty of Chemistry, Moscow State University, Leninskie Gory 1b3, Moscow, 119991, Russian Federation Department of Materials Science, MSU-BIT University, Shenzhen, 517182, China Faculty of Materials Science, Moscow State University, Leninskie Gory 1b73, Moscow, 119991, Russian Federation European Synchrotron Radiation Facility, Avenue des Martyrs 71, Grenoble, 38043, France School of Natural Sciences and Mathematics, Ural Federal University, Lenin Ave 51, Ekaterinburg, 620000, Russian Federation Export Date: 27 September 2021 Correspondence Address: Eliseev, A.A.; Faculty of Chemistry, Leninskie Gory 1b3, Russian Federation; email: artem.a.eliseev@gmail.com LA - English DB - MTMT ER - TY - JOUR AU - Maqbool, Qysar AU - Jung, Arum AU - Won, Sojeong AU - Cho, Jinhan AU - Son, Jeong Gon AU - Yeom, Bongjun TI - Chiral Magneto-Optical Properties of Supra-Assembled Fe3O4 Nanoparticles JF - ACS APPLIED MATERIALS & INTERFACES J2 - ACS APPL MATER INTER VL - 13 PY - 2021 IS - 45 SP - 54301 EP - 54307 PG - 7 SN - 1944-8244 DO - 10.1021/acsami.1c16954 UR - https://m2.mtmt.hu/api/publication/33394623 ID - 33394623 AB - Research on the chiral magneto-optical properties of inorganic nanomaterials has enabled novel applications in advanced optical and electronic devices. However, the corresponding chiral magneto-optical responses have only been studied under strong magnetic fields of >= 1 T, which limits the wider application of these novel materials. In this paper, we report on the enhanced chiral magneto-optical activity of supra-assembled Fe3O4 magnetite nanoparticles in the visible range at weak magnetic fields of 1.5 mT. The spherical supra-assembled particles with a diameter of similar to 90 nm prepared by solvothermal synthesis had single-crystal-like structures, which resulted from the oriented attachment of nanograins. They exhibited superparamagnetic behavior even with a relatively large supraparticle diameter that exceeded the size limit for superparamagnetism. This can be attributed to the small size of nanograins with a diameter of similar to 12 nm that constitute the suprastructured particles. Magnetic circular dichroism (MCD) measurements at magnetic fields of 1.5 mT showed distinct chiral magneto-optical activity from charge transfer transitions of magnetite in the visible range. For the supraparticles with lower crystallinity, the MCD peaks in the 250-550 nm range assigned as the ligand-to-metal charge transfer (LMCT) and the inter-sublattice charge transfer (ISCT) show increased intensities in comparison to those with higher crystallinity samples. On the contrary, the higher crystallinity sample shows higher MCD intensities near 600-700 nm for the intervalence charge transfer (IVCT) transition. The differences in MCD responses can be attributed to the crystallinity determined by the reaction time, lattice distortion near grain boundaries of the constituent nanocrystals, and dipolar interactions in the supra-assembled structures. LA - English DB - MTMT ER - TY - JOUR AU - Tomchuk, Oleksandr V AU - Bulavin, Leonid A. AU - Avdeev, Mikhail V TI - Isoscattering point in SANS contrast variation study of aqueous magnetic fluids JF - SOFT MATERIALS J2 - SOFT MATER PY - 2021 PG - 6 SN - 1539-445X DO - 10.1080/1539445X.2021.1995424 UR - https://m2.mtmt.hu/api/publication/33309479 ID - 33309479 AB - Small-angle neutron scattering (SANS) is widely used in structural analysis of complex liquid dispersions. An essential feature of SANS experiments for such systems is hydrogen/deuterium isotopic substitution in liquid media, which makes it possible to change the neutron scattering length density of the solvents, thus providing the basis for the contrast variation technique. In some cases, for dispersed particles with near-spherical symmetry, one can observe in the scattering curves specific points at which the scattered intensity is independent of the scattering contrast between dispersed particles and solvent. These points are referred to as 'isoscattering points' and in monodisperse solutions related to the particle size. Here, we report this effect for rather polydisperse (above 40%) magnetic fluids with core-shell particles in a liquid medium (water). It is shown that the effective isoscattering point can be analyzed to some extent for polydisperse systems, which gives additional possibilities for structural characterization of complex solutions via SANS. LA - English DB - MTMT ER - TY - JOUR AU - Tomchuk, O.V. AU - Avdeev, M.V. AU - Aksenov, V.L. AU - Shulenina, A.V. AU - Ivankov, O.I. AU - Ryukhtin, V. AU - Vékás, L. AU - Bulavin, L.A. TI - Temperature-dependent fractal structure of particle clusters in aqueous ferrofluids by small-angle scattering JF - COLLOIDS AND SURFACES A : PHYSICOCHEMICAL AND ENGINEERING ASPECTS J2 - COLLOID SURFACE A VL - 613 PY - 2021 SN - 0927-7757 DO - 10.1016/j.colsurfa.2020.126090 UR - https://m2.mtmt.hu/api/publication/32241961 ID - 32241961 LA - English DB - MTMT ER - TY - JOUR AU - Vaewbundit, Sukanda AU - Siriphannon, Punnama TI - Soft solution in situ synthesis of chitosan/iron oxide nanocomposites and their magnetic properties JF - SOFT MATTER J2 - SOFT MATTER VL - 17 PY - 2021 IS - 25 SP - 6238 EP - 6247 PG - 10 SN - 1744-683X DO - 10.1039/d1sm00381j UR - https://m2.mtmt.hu/api/publication/32276685 ID - 32276685 AB - Chitosan/iron oxide nanocomposites (CS/IO) were synthesized by using soft solution in situ synthesis. An aqueous mixture of iron(II), iron(III) and chitosan was added drop by drop to a solution of a sodium tripolyphosphate crosslinker with stirring for 30 min, resulting in in situ ionically crosslinked chitosan, with incorporated Fe2+ and Fe3+ (CS/Fe2+Fe3+). The CS/Fe2+Fe3+ precursors were then treated in alkaline solution by two different methods, i.e. hydrothermal and refluxing, where the Fe2+ and Fe3+ ions reacted to form quasi-spherical magnetite-maghemite nanocrystals in the constrained space of the crosslinked chitosan CS/IO nanocomposites. The pressurized hydrothermal system promoted the growth of iron oxide nanocrystals, leading to slightly larger crystallites (3.9-4.3 nm), compared to 3.9 nm from the refluxing system. The iron oxide crystallites also became smaller with increased cross-linking density of the chitosan matrix. The resultant CS/IO nanocomposites exhibited superparamagnetism with M-max in the range of 9.6-15 emu g(-1) and low coercivity and magnetic remanence. In addition, they showed high cell viability, 82-96%, indicating them as potential candidates for medical applications. LA - English DB - MTMT ER - TY - JOUR AU - Zaripov, A. K. AU - Ubaidi, A. TI - Dependence of the Viscosity of Magnetic Fluids on the Concentration of Magnetic Particles, Temperature, and a Magnetic Field JF - RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A J2 - RUSS J PHYS CHEM A+ VL - 95 PY - 2021 IS - 10 SP - 2141 EP - 2147 PG - 7 SN - 0036-0244 DO - 10.1134/S0036024421100320 UR - https://m2.mtmt.hu/api/publication/33394628 ID - 33394628 AB - Dependences of the viscosities of magnetic fluids based on kerosene and water on the concentration, temperature, and the strength of an external magnetic field are investigated using an analytical expression for the shear viscosity coefficient, obtained via nonequilibrium statistical theory. Calculations based on the expression for the shear viscosity coefficient show that viscosity grows nonlinearly along with concentration and falls as the temperature rises, in agreement with experiments. Allowing for dipole-dipole interaction between magnetic particles and their interaction with an external magnetic field, a magnetoviscous effect is revealed in the studied magnetic fluids, and qualitative agreement is reached between calculations and experimental data. LA - English DB - MTMT ER - TY - JOUR AU - Krasia-Christoforou, T. AU - Socoliuc, V. AU - Knudsen, K.D. AU - Csákiné Tombácz, Etelka AU - Turcu, R. AU - Vékás, L. TI - From single-core nanoparticles in ferrofluids to multi-core magnetic nanocomposites: Assembly strategies, structure, and magnetic behavior JF - NANOMATERIALS J2 - NANOMATERIALS-BASEL VL - 10 PY - 2020 IS - 11 PG - 67 SN - 2079-4991 DO - 10.3390/nano10112178 UR - https://m2.mtmt.hu/api/publication/32078294 ID - 32078294 N1 - Department of Mechanical and Manufacturing Engineering, University of Cyprus, 75, Kallipoleos Avenue, P.O. Box 20537, Nicosia, 1678, Cyprus Laboratory of Magnetic Fluids, Center for Fundamental and Advanced Technical Research, Romanian Academy-Timisoara Branch, Mihai Viteazul Ave. 24, Timisoara, 300223, Romania Department for Neutron Materials Characterization, Institute for Energy Technology (IFE), Kjeller, 2027, Norway Soós Ernő Water Technology Research and Development Center, University of Pannonia, H-8800 Zrínyi M. str. 18., Nagykanizsa, Hungary Department of Physics of Nanostructured Systems, National Institute for Research and Development of Isotopic and Molecular Technologies, Donat Str. 67-103, Cluj-Napoca, 400293, Romania Cited By :12 Export Date: 18 November 2022 Correspondence Address: Turcu, R.; Department of Physics of Nanostructured Systems, Donat Str. 67-103, Romania; email: rodica.turcu@itim-cj.ro LA - English DB - MTMT ER - TY - JOUR AU - Latikka, Mika AU - Backholm, Matilda AU - Baidya, Avijit AU - Ballesio, Alberto AU - Serve, Amandine AU - Beaune, Gregory AU - Timonen, Jaakko V. I AU - Pradeep, Thalappil AU - Ras, Robin H. A. TI - Ferrofluid Microdroplet Splitting for Population-Based Microfluidics and Interfacial Tensiometry JF - ADVANCED SCIENCE J2 - ADV SCI VL - 7 PY - 2020 IS - 14 PG - 8 SN - 2198-3844 DO - 10.1002/advs.202000359 UR - https://m2.mtmt.hu/api/publication/31501702 ID - 31501702 AB - Ferrofluids exhibit a unique combination of liquid properties and strong magnetic response, which leads to a rich variety of interesting functional properties. Here, the magnetic-field-induced splitting of ferrofluid droplets immersed in an immiscible liquid is presented, and related fascinating dynamics and applications are discussed. A magnetic field created by a permanent magnet induces instability on a mother droplet, which divides into two daughter droplets in less than 0.1 s. During the splitting process, the droplet undergoes a Plateau-Rayleigh-like instability, which is investigated using high-speed imaging. The dynamics of the resulting satellite droplet formation is shown to depend on the roughness of the supporting surface. Further increasing the field results in additional splitting events and self-assembly of microdroplet populations, which can be magnetically actuated. The effects of magnetization and interfacial tension are systematically investigated by varying magnetic nanoparticles and surfactant concentrations, and a variety of outcomes from labyrinthine patterns to discrete droplets are observed. As the splitting process depends on interfacial tension, the droplet splitting can be used as a measure for interfacial tension as low as 0.1 mN m(-1). Finally, a population-based digital microfluidics concept based on the self-assembled microdroplets is presented. LA - English DB - MTMT ER - TY - JOUR AU - Nagornyi, A.V. AU - Shlapa, Y.Y. AU - Avdeev, M.V. AU - Solopan, S.O. AU - Belous, A.G. AU - Shulenina, A.V. AU - Ivankov, O.I. AU - Bulavin, L.A. TI - Structural characterization of aqueous magnetic fluids with nanomagnetite of different origin stabilized by sodium oleate JF - JOURNAL OF MOLECULAR LIQUIDS J2 - J MOL LIQ VL - 312 PY - 2020 SN - 0167-7322 DO - 10.1016/j.molliq.2020.113430 UR - https://m2.mtmt.hu/api/publication/32241971 ID - 32241971 N1 - Export Date: 24 January 2024 CODEN: JMLID LA - English DB - MTMT ER - TY - JOUR AU - Saini, A. AU - Borchers, J.A. AU - George, S. AU - Maranville, B.B. AU - Krycka, K.L. AU - Dura, J.A. AU - Theis-Bröhl, K. AU - Wolff, M. TI - Layering of magnetic nanoparticles at amorphous magnetic templates with perpendicular anisotropy JF - SOFT MATTER J2 - SOFT MATTER VL - 16 PY - 2020 IS - 33 SP - 7676 EP - 7684 PG - 9 SN - 1744-683X DO - 10.1039/d0sm01088j UR - https://m2.mtmt.hu/api/publication/33307429 ID - 33307429 LA - English DB - MTMT ER - TY - JOUR AU - Socoliuc, V. AU - Peddis, D. AU - Petrenko, V.I. AU - Avdeev, M.V. AU - Susan-Resiga, D. AU - Szabó, Tamás AU - Turcu, R. AU - Csákiné Tombácz, Etelka AU - Vékás, L. TI - Magnetic nanoparticle systems for nanomedicine—a materials science perspective JF - MAGNETOCHEMISTRY J2 - MAGNETOCHEMISTRY VL - 6 PY - 2020 IS - 1 PG - 36 SN - 2312-7481 DO - 10.3390/magnetochemistry6010002 UR - https://m2.mtmt.hu/api/publication/32078295 ID - 32078295 LA - English DB - MTMT ER - TY - JOUR AU - Tomchuk, OV TI - The concept of fractals in the structural analysis of nanosystems: A retrospective look and prospects JF - UKRAINIAN JOURNAL OF PHYSICS J2 - UKR J PHYS VL - 65 PY - 2020 IS - 8 SP - 709 EP - 728 PG - 20 SN - 2071-0186 DO - 10.15407/ujpe65.8.709 UR - https://m2.mtmt.hu/api/publication/31622904 ID - 31622904 LA - English DB - MTMT ER - TY - JOUR AU - van Silfhout, Alex M. AU - Engelkamp, Hans AU - Erne, Ben H. TI - Colloidal Stability of Aqueous Ferrofluids at 10 T JF - JOURNAL OF PHYSICAL CHEMISTRY LETTERS J2 - J PHYS CHEM LETT VL - 11 PY - 2020 IS - 15 SP - 5908 EP - 5912 PG - 5 SN - 1948-7185 DO - 10.1021/acs.jpclett.0c01804 UR - https://m2.mtmt.hu/api/publication/31735612 ID - 31735612 AB - Magnetic density separation is an emerging recycling technology by which several different waste materials-from plastic products, electronics, or other-can be sorted in a single continuous processing step. Larger-scale installations will require ferrofluids that remain stable at several teslas, high magnetic fields at which colloidal stability was not investigated before. Here we optically monitor the concentration profile of iron oxide nanoparticles in aqueous ferrofluids at a field of 10 T and a gradient of 100 T/m. The sedimentation velocities and equilibrium concentration profiles inform on maintenance or breakdown of colloidal stability, which depends on the concentration and magnetic coupling energy of the nanoparticles. Comparison with results obtained with a small neodymium magnet indicate that stability at moderate fields is predictive of stability at much higher fields, which facilitates the development of new ferrofluids dedicated to magnetic density separation. LA - English DB - MTMT ER - TY - JOUR AU - van Silfhout, Alex M. AU - Engelkamp, Hans AU - Erne, Ben H. TI - Magnetic Sedimentation Velocities and Equilibria in Dilute Aqueous Ferrofluids JF - JOURNAL OF PHYSICAL CHEMISTRY B J2 - J PHYS CHEM B VL - 124 PY - 2020 IS - 36 SP - 7989 EP - 7998 PG - 10 SN - 1520-6106 DO - 10.1021/acs.jpcb.0c06795 UR - https://m2.mtmt.hu/api/publication/31735614 ID - 31735614 AB - Dilute ferrofluids have important applications in the separation of materials via magnetic levitation. However, dilute ferrofluids pose an additional challenge compared to concentrated ones. Migration of the magnetic nanoparticles toward a magnet is not well counteracted by a buildup of an osmotic pressure gradient, and consequently, homogeneity of the fluid is gradually lost. Here, we investigate this phenomenon by measuring and numerically modeling time-dependent concentration profiles in aqueous ferrofluids in the field of a neodymium magnet and at 10 T in a Bitter magnet. The numerical model incorporates magnetic, frictional, and osmotic forces on the particles and takes into account the polydispersity of the particles and the spatial dependence of the magnetic field. The magnetic sedimentation rate in our most stable ferrofluids can be understood in terms of the magnetophoresis of separate nanoparticles, a best-case scenario when it comes to applications. LA - English DB - MTMT ER - TY - CHAP AU - Wang, D. AU - Lqbal, M. AU - Zhu, M. ED - Xin, S. TI - Synthesis of fe3o4 magnetic nanoparticles in a helical microreactor VL - 842 KEM PB - Trans Tech Publications SN - 9783035716511 T3 - Key engineering materials, ISSN 1013-9826 ; 842 KEM. PY - 2020 SP - 174 EP - 181 PG - 8 UR - https://m2.mtmt.hu/api/publication/32242057 ID - 32242057 N1 - College of Chemical and Biological Engineering, Zhejiang University, Zhejiang, 310027, China Institute of Zhejiang University-Quzhou, 78 Jiuhua Boulevard North, Quzhou, 324000, China Export Date: 27 September 2021 CODEN: KEMAE Correspondence Address: Lqbal, M.; College of Chemical and Biological Engineering, China; email: mikuop@gmail.com LA - English DB - MTMT ER - TY - JOUR AU - Bereznyak, Ekaterina G. AU - Dukhopelnikov, Evgen V. AU - Pesina, Daryna A. AU - Gladkovskaya, Natalia A. AU - Vakula, Arthur S. AU - Kalmykova, Tatyana D. AU - Tarapov, Sergey I. AU - Polozov, Stanislav D. AU - Krasnoselsky, Nikolay V. AU - Belous, Anatoliy G. AU - Solopan, Sergey A. TI - Binding Parameters of Magnetite Nanoparticles Interaction with Anticancer Drug Doxorubicin JF - BIONANOSCIENCE J2 - BIONANOSCI VL - 9 PY - 2019 IS - 2 SP - 406 EP - 413 PG - 8 SN - 2191-1630 DO - 10.1007/s12668-019-00614-2 UR - https://m2.mtmt.hu/api/publication/31101569 ID - 31101569 AB - Magnetic nanoparticles have received great interest for their use in cancer diagnostics and therapy. They can be loaded with the chemotherapeutic agents and used for the targeted delivery to the tumor and the retention of the drugs there under the external magnetic field. In the present paper, we investigated the interaction between magnetic Fe3O4 nanoparticles, both bare and coated with trisodium citrate, and anticancer drug doxorubicin in the base and acidic forms, respectively. The changes in the drug absorption spectra in the visible region and the shift of ferromagnetic resonance spectra taking place at the drug-nanoparticle interaction were analyzed. The spectrophotometric titration data were processed using the Langmuir model of equilibrium binding. For both systems, we report the calculated thermodynamic binding parameters including the drug-nanoparticle binding constants and binding site sizes. We show that in order to interact with the doxorubicin molecules in acidic form, the surface of the nanoparticles needs to be modified with trisodium citrate which provides their surface with the negative charge. At the same time, the bare magnetite nanoparticles are able to interact with the base form of the drug. The comparison of the binding parameters in both systems has shown that the nanoparticle-citrate-doxorubicin system is more promising in terms of biomedical application. LA - English DB - MTMT ER - TY - JOUR AU - Guan, Rongzhang AU - Wang, Junzhang AU - Bian, Xiufang AU - Yu, Mengchun AU - Yang, Yinghui AU - Yuan, Chao AU - Wang, Chao AU - Lu, Dujiang TI - Enhanced saturation magnetization and stability of magnetic nanofluids based on FeCo@CoFe2O4 nanoparticles JF - MATERIALS RESEARCH EXPRESS J2 - MATER RES EXPRESS VL - 6 PY - 2019 IS - 12 PG - 12 SN - 2053-1591 DO - 10.1088/2053-1591/ab555c UR - https://m2.mtmt.hu/api/publication/31101567 ID - 31101567 AB - Low saturation magnetization and poor stability caused by agglomeration and sedimentation are two main factors restricting practical applications of magnetic nanofluids (MNFs). Here, we synthesized FeCo@CoFe2O4 core-shell particles using a simple one-step polyol method and prepared of octane-based MNFs with high saturation magnetization and excellent stability. The FeCo@CoFe2O4 particles have regular spherical morphology with homogeneous diameter of about 13 nm. The saturation magnetization of FeCo@CoFe2O4 particles is 102 emu g(?1), which is almost twice as much as that of CoFe2O4 particles. Besides, the MNFs with FeCo@CoFe2O4 particles are superparamagnetic and their saturation magnetization is 7.24 emu g(?1). FeCo@CoFe2O4 MNFs exhibit stronger magnetic responsiveness than that of CoFe2O4 MNFs, which reaches 5175.74 cP under an external magnetic field of 534 Gs. Moreover, under an external magnetic field of 200 mT, the MNFs with FeCo@CoFe2O4 particles exhibit excellent stability and their magnetic weights decrease by 0.149 g for 289 h, which makes these MNFs have potential to apply in long-term use and magnetoviscous fields. LA - English DB - MTMT ER - TY - JOUR AU - van Silfhout, Alex AU - Erne, Ben TI - Magnetic detection of nanoparticle sedimentation in magnetized ferrofluids JF - JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS J2 - J MAGN MAGN MATER VL - 472 PY - 2019 SP - 53 EP - 58 PG - 6 SN - 0304-8853 DO - 10.1016/j.jmmm.2018.10.010 UR - https://m2.mtmt.hu/api/publication/31101568 ID - 31101568 AB - Colloidal stability in external magnetic field is crucial for applications of ferrofluids. Here, we introduce a magnetic analysis approach to monitor how rapidly magnetic nanoparticles are pulled out of the liquid in an external magnetic field gradient. The motion of the sedimentation front is deduced from the time-dependent field produced by a column of ferrofluid placed on a permanent magnet. Citrate-stabilized nanoparticles in a homemade aqueous ferrofluid are found to sediment at the rate expected of single nanoparticles. More rapid sedimentation occurs in two other types of ferrofluid, indicating that our magnetic sedimentation analysis method can differentiate ferrofluids with respect to their in-field colloidal stability. Our method is further validated by comparison with time-dependent X-ray transmission profiles. LA - English DB - MTMT ER -