@article{MTMT:34634659, title = {SPIONs: Superparamagnetic iron oxide-based nanoparticles for the delivery of microRNAi-therapeutics in cancer}, url = {https://m2.mtmt.hu/api/publication/34634659}, author = {Kara, Goknur and Ozpolat, Bulent}, doi = {10.1007/s10544-024-00698-y}, journal-iso = {BIOMED MICRODEVICES}, journal = {BIOMEDICAL MICRODEVICES}, volume = {26}, unique-id = {34634659}, issn = {1387-2176}, keywords = {miRNA; RNAi; Targeted cancer therapy; Superparamagnetic iron oxide nanoparticles}, year = {2024}, eissn = {1572-8781} } @article{MTMT:33885128, title = {Mass-production of water-based ferrofluids capable of developing spike-like structures}, url = {https://m2.mtmt.hu/api/publication/33885128}, author = {Jara, Denisse and Veiga, Lionel S. and Garate, Octavio and Ybarra, Gabriel and Tancredi, Pablo}, doi = {10.1016/j.jmmm.2023.170622}, journal-iso = {J MAGN MAGN MATER}, journal = {JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS}, volume = {572}, unique-id = {33885128}, issn = {0304-8853}, abstract = {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.}, keywords = {CITRATE; FERROFLUIDS; Iron oxide nanoparticles; magnetic colloids; Water -based ferrofluids}, year = {2023}, eissn = {1873-4766} } @article{MTMT:33931149, title = {Theory analyses and applications of magnetic fluids in sealing}, url = {https://m2.mtmt.hu/api/publication/33931149}, author = {Li, Decai and Li, Yanwen and Li, Zixian and Wang, Yuming}, doi = {10.1007/s40544-022-0676-8}, journal-iso = {FRICTION}, journal = {FRICTION}, unique-id = {33931149}, issn = {2223-7690}, abstract = {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.}, keywords = {Magnetic fluid; sealing mechanism; static sealing; rotary sealing; reciprocating sealing}, year = {2023}, eissn = {2223-7704} } @article{MTMT:33931150, title = {The effect of microparticles/nanoparticles surface modification on the magnetorheological fluid properties: A review}, url = {https://m2.mtmt.hu/api/publication/33931150}, author = {Rabbani, Yahya and Hajinajaf, Nima and Shariaty-Niassar, Mojtaba}, doi = {10.1177/1045389X221147667}, journal-iso = {J INTEL MAT SYST STR}, journal = {JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES}, unique-id = {33931150}, issn = {1045-389X}, abstract = {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.}, keywords = {NANOPARTICLES; surface modification; Microparticles; CORE-SHELL; Magnetorheological fluid}, year = {2023}, eissn = {1530-8138} } @article{MTMT:33587864, title = {Physicochemical properties of mixed oil-based and bilayer-stabilized magnetic fluids}, url = {https://m2.mtmt.hu/api/publication/33587864}, author = {Upadhyay, R.V. and Raj, K. and Parekh, K.H. and Pisuwala, M.S.}, doi = {10.1007/s11696-023-02672-z}, journal-iso = {CHEM PAP / CHEM ZVESTI}, journal = {CHEMICAL PAPERS / CHEMICKÉ ZVESTI}, volume = {77}, unique-id = {33587864}, issn = {2585-7290}, year = {2023}, eissn = {1336-9075}, pages = {2871-2883} } @article{MTMT:33394612, title = {Nanomagnet Bioconjugates with anti-CRP Polyclonal Antibodies as Nanobioprobes for Enhanced Impedimetric Detection of CRP}, url = {https://m2.mtmt.hu/api/publication/33394612}, author = {Adesina, Abiola and Adeniyi, Omotayo and Mashazi, Philani}, doi = {10.1002/elan.202200059}, journal-iso = {ELECTROANAL}, journal = {ELECTROANALYSIS}, unique-id = {33394612}, issn = {1040-0397}, abstract = {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).}, keywords = {electrochemical impedance spectroscopy; Immunosensor; C-reactive protein (CRP); oriented antibody; magnetic-silica antibody nanobioprobes}, year = {2022}, eissn = {1521-4109}, orcid-numbers = {Mashazi, Philani/0000-0003-4815-6146} } @article{MTMT:33098853, title = {Magnetoresponsive Functionalized Nanocomposite Aggregation Kinetics and Chain Formation at the Targeted Site during Magnetic Targeting}, url = {https://m2.mtmt.hu/api/publication/33098853}, author = {Bernad, Sandor I. and Socoliuc, Vlad and Susan-Resiga, Daniela and Crăciunescu, Izabell and Turcu, Rodica and Csákiné Tombácz, Etelka and Vékás, Ladislau and Ioncica, Maria C. and Bernad, Elena S.}, doi = {10.3390/pharmaceutics14091923}, journal-iso = {PHARMACEUTICS}, journal = {PHARMACEUTICS}, volume = {14}, unique-id = {33098853}, issn = {1999-4923}, abstract = {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.}, year = {2022}, eissn = {1999-4923}, orcid-numbers = {Bernad, Sandor I./0000-0002-0617-5376; Socoliuc, Vlad/0000-0003-0529-1911; Csákiné Tombácz, Etelka/0000-0002-2068-0459; Vékás, Ladislau/0000-0002-8553-4049; Bernad, Elena S./0000-0003-1084-2714} } @article{MTMT:33931151, title = {Interaction of doxorubicin delivered by superparamagnetic iron oxide nanoparticles with DNA}, url = {https://m2.mtmt.hu/api/publication/33931151}, author = {Dukhopelnykov, E. V. and Blyzniuk, Yu. N. and Skuratovska, A. A. and Bereznyak, E. G. and Gladkovskaya, N. A.}, doi = {10.1016/j.colsurfb.2022.112815}, journal-iso = {COLLOID SURFACE B}, journal = {COLLOIDS AND SURFACES B: BIOINTERFACES}, volume = {219}, unique-id = {33931151}, issn = {0927-7765}, abstract = {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.}, keywords = {DNA; doxorubicin; nanocarrier; Superparamagnetic iron oxide nanoparticles; binding parameters}, year = {2022}, eissn = {1873-4367} } @article{MTMT:32841133, title = {Using small-angle scattering to guide functional magnetic nanoparticle design}, url = {https://m2.mtmt.hu/api/publication/32841133}, author = {Honecker, D. and Bersweiler, M. and Erokhin, S. and Berkov, D. and Chesnel, K. and Venero, D.A. and Qdemat, A. and Disch, S. and Jochum, J.K. and Michels, A. and Bender, P.}, doi = {10.1039/d1na00482d}, journal-iso = {NANOSCALE ADV}, journal = {NANOSCALE ADVANCES}, volume = {4}, unique-id = {32841133}, issn = {2516-0230}, year = {2022}, eissn = {2516-0230}, pages = {1026-1059} } @article{MTMT:32767794, title = {Ferrofluids and bio-ferrofluids: looking back and stepping forward}, url = {https://m2.mtmt.hu/api/publication/32767794}, author = {Socoliuc, V. and Avdeev, M. V. and Kuncser, V. and Turcu, Rodica and Csákiné Tombácz, Etelka and Vékás, L.}, doi = {10.1039/D1NR05841J}, journal-iso = {NANOSCALE}, journal = {NANOSCALE}, volume = {14}, unique-id = {32767794}, issn = {2040-3364}, year = {2022}, eissn = {2040-3372}, pages = {4786-4886}, orcid-numbers = {Turcu, Rodica/0000-0002-6355-8381; Csákiné Tombácz, Etelka/0000-0002-2068-0459; Vékás, L./0000-0002-8553-4049} } @article{MTMT:33224839, title = {Enhancement of the Catalytic Performance and Operational Stability of Sol-Gel-Entrapped Cellulase by Tailoring the Matrix Structure and Properties}, url = {https://m2.mtmt.hu/api/publication/33224839}, author = {Vasilescu, Corina and Marc, Simona and Hulka, Iosif and Paul, Cristina}, doi = {10.3390/gels8100626}, journal-iso = {GELS-BASEL}, journal = {GELS (BASEL)}, volume = {8}, unique-id = {33224839}, abstract = {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.}, keywords = {Cellulase; CATALYTIC PERFORMANCE; CELLULOSE HYDROLYSIS; Reusability; Sol–gel entrapment; magnetic nanobiocatalysts}, year = {2022}, eissn = {2310-2861} } @article{MTMT:33394615, title = {Fe3O4-Mg(OH)(2) nanocomposite as a scavenger for silver nanoparticles: Rational design, facile synthesis, and enhanced performance}, url = {https://m2.mtmt.hu/api/publication/33394615}, author = {Yin, Wei and Liu, Meng and Wang, Yu-Han and Huang, Yang and Zhao, Tian-Lei and Yao, Qi-Zhi and Fu, Sheng-Quan and Zhou, Gen-Tao}, doi = {10.1016/j.envres.2022.113292}, journal-iso = {ENVIRON RES}, journal = {ENVIRONMENTAL RESEARCH}, volume = {212}, unique-id = {33394615}, issn = {0013-9351}, abstract = {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.}, keywords = {REMOVAL; silver nanoparticle; Engineered nanomaterial; Emerging pollutant; Fe3O4-Mg(OH)(2) nanocomposite}, year = {2022}, eissn = {1096-0953} } @article{MTMT:32242054, title = {Development and characterization of magnetic iron oxide nanoparticles using microwave for the combustion reaction ignition, as possible candidates for biomedical applications}, url = {https://m2.mtmt.hu/api/publication/32242054}, author = {Căpraru, A. and Moacă, E.-A. and Păcurariu, C. and Ianoş, R. and Lazău, R. and Barbu-Tudoran, L.}, doi = {10.1016/j.powtec.2021.08.093}, journal-iso = {POWDER TECHNOL}, journal = {POWDER TECHNOLOGY}, volume = {394}, unique-id = {32242054}, issn = {0032-5910}, year = {2021}, eissn = {1873-328X}, pages = {1026-1038} } @article{MTMT:33394621, title = {Size Effect of Fe3O4 Nanoparticles on Magnetism and Dispersion Stability of Magnetic Nanofluid}, url = {https://m2.mtmt.hu/api/publication/33394621}, author = {Chen, Fang and Ilyas, Nasir and Liu, Xiaobing and Li, Zhenggui and Yan, Shengnan and Fu, Hao}, doi = {10.3389/fenrg.2021.780008}, journal-iso = {FRONT ENERGY RES}, journal = {FRONTIERS IN ENERGY RESEARCH}, volume = {9}, unique-id = {33394621}, issn = {2296-598X}, abstract = {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.}, keywords = {MAGNETISM; Heat Transfer; Dispersion stability; Magnetic nanofluids; Fe3O4 nanoparticle size}, year = {2021}, eissn = {2296-598X} } @article{MTMT:32242056, title = {Tunable order in colloids of hard magnetic hexaferrite nanoplatelets}, url = {https://m2.mtmt.hu/api/publication/32242056}, author = {Eliseev, A.A. and Trusov, L.A. and Anokhin, E.O. and Chumakov, A.P. and Korolev, V.V. and Sleptsova, A.E. and Boesecke, P. and Pryakhina, V.I. and Shur, V.Y. and Kazin, P.E. and Eliseev, A.A.}, doi = {10.1007/s12274-021-3572-z}, journal-iso = {NANO RES}, journal = {NANO RESEARCH}, volume = {1}, unique-id = {32242056}, issn = {1998-0124}, year = {2021}, eissn = {1998-0000} } @article{MTMT:33394623, title = {Chiral Magneto-Optical Properties of Supra-Assembled Fe3O4 Nanoparticles}, url = {https://m2.mtmt.hu/api/publication/33394623}, author = {Maqbool, Qysar and Jung, Arum and Won, Sojeong and Cho, Jinhan and Son, Jeong Gon and Yeom, Bongjun}, doi = {10.1021/acsami.1c16954}, journal-iso = {ACS APPL MATER INTER}, journal = {ACS APPLIED MATERIALS & INTERFACES}, volume = {13}, unique-id = {33394623}, issn = {1944-8244}, abstract = {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.}, keywords = {CHIRALITY; MAGNETITE; Magnetic circular dichroism; magneto-optical property; supra-assembly}, year = {2021}, eissn = {1944-8252}, pages = {54301-54307}, orcid-numbers = {Maqbool, Qysar/0000-0003-3245-8780; Son, Jeong Gon/0000-0003-3473-446X; Yeom, Bongjun/0000-0001-8914-0947} } @article{MTMT:33309479, title = {Isoscattering point in SANS contrast variation study of aqueous magnetic fluids}, url = {https://m2.mtmt.hu/api/publication/33309479}, author = {Tomchuk, Oleksandr V and Bulavin, Leonid A. and Avdeev, Mikhail V}, doi = {10.1080/1539445X.2021.1995424}, journal-iso = {SOFT MATER}, journal = {SOFT MATERIALS}, unique-id = {33309479}, issn = {1539-445X}, abstract = {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.}, keywords = {MAGNETIC FLUIDS; Small-angle neutron scattering; isoscattering point}, year = {2021}, eissn = {1539-4468}, orcid-numbers = {Tomchuk, Oleksandr V/0000-0001-8806-6861} } @article{MTMT:32241961, title = {Temperature-dependent fractal structure of particle clusters in aqueous ferrofluids by small-angle scattering}, url = {https://m2.mtmt.hu/api/publication/32241961}, author = {Tomchuk, O.V. and Avdeev, M.V. and Aksenov, V.L. and Shulenina, A.V. and Ivankov, O.I. and Ryukhtin, V. and Vékás, L. and Bulavin, L.A.}, doi = {10.1016/j.colsurfa.2020.126090}, journal-iso = {COLLOID SURFACE A}, journal = {COLLOIDS AND SURFACES A : PHYSICOCHEMICAL AND ENGINEERING ASPECTS}, volume = {613}, unique-id = {32241961}, issn = {0927-7757}, year = {2021}, eissn = {1873-4359} } @article{MTMT:32276685, title = {Soft solution in situ synthesis of chitosan/iron oxide nanocomposites and their magnetic properties}, url = {https://m2.mtmt.hu/api/publication/32276685}, author = {Vaewbundit, Sukanda and Siriphannon, Punnama}, doi = {10.1039/d1sm00381j}, journal-iso = {SOFT MATTER}, journal = {SOFT MATTER}, volume = {17}, unique-id = {32276685}, issn = {1744-683X}, abstract = {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.}, year = {2021}, eissn = {1744-6848}, pages = {6238-6247} } @article{MTMT:33394628, title = {Dependence of the Viscosity of Magnetic Fluids on the Concentration of Magnetic Particles, Temperature, and a Magnetic Field}, url = {https://m2.mtmt.hu/api/publication/33394628}, author = {Zaripov, A. K. and Ubaidi, A.}, doi = {10.1134/S0036024421100320}, journal-iso = {RUSS J PHYS CHEM A+}, journal = {RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A}, volume = {95}, unique-id = {33394628}, issn = {0036-0244}, abstract = {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.}, keywords = {magnetic field; Statistical theory; Magnetic fluid; magneto-viscosity}, year = {2021}, eissn = {1531-863X}, pages = {2141-2147} } @article{MTMT:32078294, title = {From single-core nanoparticles in ferrofluids to multi-core magnetic nanocomposites: Assembly strategies, structure, and magnetic behavior}, url = {https://m2.mtmt.hu/api/publication/32078294}, author = {Krasia-Christoforou, T. and Socoliuc, V. and Knudsen, K.D. and Csákiné Tombácz, Etelka and Turcu, R. and Vékás, L.}, doi = {10.3390/nano10112178}, journal-iso = {NANOMATERIALS-BASEL}, journal = {NANOMATERIALS}, volume = {10}, unique-id = {32078294}, year = {2020}, eissn = {2079-4991}, orcid-numbers = {Csákiné Tombácz, Etelka/0000-0002-2068-0459} } @article{MTMT:31501702, title = {Ferrofluid Microdroplet Splitting for Population-Based Microfluidics and Interfacial Tensiometry}, url = {https://m2.mtmt.hu/api/publication/31501702}, author = {Latikka, Mika and Backholm, Matilda and Baidya, Avijit and Ballesio, Alberto and Serve, Amandine and Beaune, Gregory and Timonen, Jaakko V. I and Pradeep, Thalappil and Ras, Robin H. A.}, doi = {10.1002/advs.202000359}, journal-iso = {ADV SCI}, journal = {ADVANCED SCIENCE}, volume = {7}, unique-id = {31501702}, abstract = {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.}, keywords = {magnetic fields; magnetic nanoparticles; Microfluidics; FERROFLUIDS; INTERFACIAL TENSION; fluid dynamics}, year = {2020}, eissn = {2198-3844}, orcid-numbers = {Ras, Robin H. A./0000-0002-2076-242X} } @article{MTMT:32241971, title = {Structural characterization of aqueous magnetic fluids with nanomagnetite of different origin stabilized by sodium oleate}, url = {https://m2.mtmt.hu/api/publication/32241971}, author = {Nagornyi, A.V. and Shlapa, Y.Y. and Avdeev, M.V. and Solopan, S.O. and Belous, A.G. and Shulenina, A.V. and Ivankov, O.I. and Bulavin, L.A.}, doi = {10.1016/j.molliq.2020.113430}, journal-iso = {J MOL LIQ}, journal = {JOURNAL OF MOLECULAR LIQUIDS}, volume = {312}, unique-id = {32241971}, issn = {0167-7322}, year = {2020}, eissn = {1873-3166} } @article{MTMT:33307429, title = {Layering of magnetic nanoparticles at amorphous magnetic templates with perpendicular anisotropy}, url = {https://m2.mtmt.hu/api/publication/33307429}, author = {Saini, A. and Borchers, J.A. and George, S. and Maranville, B.B. and Krycka, K.L. and Dura, J.A. and Theis-Bröhl, K. and Wolff, M.}, doi = {10.1039/d0sm01088j}, journal-iso = {SOFT MATTER}, journal = {SOFT MATTER}, volume = {16}, unique-id = {33307429}, issn = {1744-683X}, year = {2020}, eissn = {1744-6848}, pages = {7676-7684} } @article{MTMT:32078295, title = {Magnetic nanoparticle systems for nanomedicine—a materials science perspective}, url = {https://m2.mtmt.hu/api/publication/32078295}, author = {Socoliuc, V. and Peddis, D. and Petrenko, V.I. and Avdeev, M.V. and Susan-Resiga, D. and Szabó, Tamás and Turcu, R. and Csákiné Tombácz, Etelka and Vékás, L.}, doi = {10.3390/magnetochemistry6010002}, journal-iso = {MAGNETOCHEMISTRY}, journal = {MAGNETOCHEMISTRY}, volume = {6}, unique-id = {32078295}, year = {2020}, eissn = {2312-7481}, orcid-numbers = {Szabó, Tamás/0000-0001-8182-640X; Csákiné Tombácz, Etelka/0000-0002-2068-0459} } @article{MTMT:31622904, title = {The concept of fractals in the structural analysis of nanosystems: A retrospective look and prospects}, url = {https://m2.mtmt.hu/api/publication/31622904}, author = {Tomchuk, OV}, doi = {10.15407/ujpe65.8.709}, journal-iso = {UKR J PHYS}, journal = {UKRAINIAN JOURNAL OF PHYSICS}, volume = {65}, unique-id = {31622904}, issn = {2071-0186}, year = {2020}, eissn = {2071-0194}, pages = {709-728} } @article{MTMT:31735612, title = {Colloidal Stability of Aqueous Ferrofluids at 10 T}, url = {https://m2.mtmt.hu/api/publication/31735612}, author = {van Silfhout, Alex M. and Engelkamp, Hans and Erne, Ben H.}, doi = {10.1021/acs.jpclett.0c01804}, journal-iso = {J PHYS CHEM LETT}, journal = {JOURNAL OF PHYSICAL CHEMISTRY LETTERS}, volume = {11}, unique-id = {31735612}, issn = {1948-7185}, abstract = {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.}, year = {2020}, pages = {5908-5912}, orcid-numbers = {Engelkamp, Hans/0000-0001-9920-0536} } @article{MTMT:31735614, title = {Magnetic Sedimentation Velocities and Equilibria in Dilute Aqueous Ferrofluids}, url = {https://m2.mtmt.hu/api/publication/31735614}, author = {van Silfhout, Alex M. and Engelkamp, Hans and Erne, Ben H.}, doi = {10.1021/acs.jpcb.0c06795}, journal-iso = {J PHYS CHEM B}, journal = {JOURNAL OF PHYSICAL CHEMISTRY B}, volume = {124}, unique-id = {31735614}, issn = {1520-6106}, abstract = {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.}, year = {2020}, eissn = {1520-5207}, pages = {7989-7998}, orcid-numbers = {Engelkamp, Hans/0000-0001-9920-0536} } @inproceedings{MTMT:32242057, title = {Synthesis of fe3o4 magnetic nanoparticles in a helical microreactor}, url = {https://m2.mtmt.hu/api/publication/32242057}, author = {Wang, D. and Lqbal, M. and Zhu, M.}, volume = {842 KEM}, unique-id = {32242057}, year = {2020}, pages = {174-181} } @article{MTMT:31101569, title = {Binding Parameters of Magnetite Nanoparticles Interaction with Anticancer Drug Doxorubicin}, url = {https://m2.mtmt.hu/api/publication/31101569}, author = {Bereznyak, Ekaterina G. and Dukhopelnikov, Evgen V. and Pesina, Daryna A. and Gladkovskaya, Natalia A. and Vakula, Arthur S. and Kalmykova, Tatyana D. and Tarapov, Sergey I. and Polozov, Stanislav D. and Krasnoselsky, Nikolay V. and Belous, Anatoliy G. and Solopan, Sergey A.}, doi = {10.1007/s12668-019-00614-2}, journal-iso = {BIONANOSCI}, journal = {BIONANOSCIENCE}, volume = {9}, unique-id = {31101569}, issn = {2191-1630}, abstract = {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.}, keywords = {doxorubicin; Magnetite Nanoparticles; Vis spectroscopy; Ferromagnetic resonance; binding parameters}, year = {2019}, eissn = {2191-1649}, pages = {406-413} } @article{MTMT:31101567, title = {Enhanced saturation magnetization and stability of magnetic nanofluids based on FeCo@CoFe2O4 nanoparticles}, url = {https://m2.mtmt.hu/api/publication/31101567}, author = {Guan, Rongzhang and Wang, Junzhang and Bian, Xiufang and Yu, Mengchun and Yang, Yinghui and Yuan, Chao and Wang, Chao and Lu, Dujiang}, doi = {10.1088/2053-1591/ab555c}, journal-iso = {MATER RES EXPRESS}, journal = {MATERIALS RESEARCH EXPRESS}, volume = {6}, unique-id = {31101567}, abstract = {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.}, keywords = {STABILITY; Viscosity; magnetic properties; Core-shell structure; Magnetic nanofluids}, year = {2019}, eissn = {2053-1591} } @article{MTMT:31101568, title = {Magnetic detection of nanoparticle sedimentation in magnetized ferrofluids}, url = {https://m2.mtmt.hu/api/publication/31101568}, author = {van Silfhout, Alex and Erne, Ben}, doi = {10.1016/j.jmmm.2018.10.010}, journal-iso = {J MAGN MAGN MATER}, journal = {JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS}, volume = {472}, unique-id = {31101568}, issn = {0304-8853}, abstract = {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.}, keywords = {magnetic nanoparticles; FERROFLUIDS; Sedimentation; COLLOIDAL STABILITY; X-ray transmission}, year = {2019}, eissn = {1873-4766}, pages = {53-58}, orcid-numbers = {van Silfhout, Alex/0000-0002-1666-6259} }