Vlad Socoliuc

Romanian Academy

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Co-Authors

L. Vékás

Romanian Academy

Rodica Turcu

National Institute for Research and Development of Isotopic and Molecular Technologies

Daniela Susan-Resiga

West University of Timişoara

Elena-Alina Moacă

Victor Babeș University of Medicine and Pharmacy Timișoara

Oana Marinică

Polytechnic University of Timişoara

Etelka Tombácz

University of Pannonia

Florica Bălănean

Romanian Academy

Laurentiu Popescu

Institute of Space Science - INFLPR Subsidiary

МВ

М. В. Авдеев

Joint Institute for Nuclear Research

Cornelia Păcurariu

Polytechnic University of Timişoara

Cooperative Institutions

Victor Babeș University of Medicine and Pharmacy Timișoara

Romanian Academy

Polytechnic University of Timişoara

West University of Timişoara

Centre National de la Recherche Scientifique

National Institute for Research and Development of Isotopic and Molecular Technologies

University of Cyprus

Institutul de Chimie Macromoleculară Petru Poni

Grigore T. Popa University of Medicine and Pharmacy

Babeș-Bolyai University

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Investigation of Cubic and Spherical IONPs’ Rheological Characteristics and Aggregation Patterns from the Perspective of Magnetic Targeting

Magnetochemistry (2023)

Maria C. Ioncica Sulalit Bandyopadhyay Nesrine Bali Vlad Socoliuc S. I. Bernad

Based on our prior research, we synthesized iron-oxide nanoparticles (IONPs) in two shapes (spherical and cubic) and sized them for the current inquiry. This research examined the magnetic, rheological, and sedimentation properties of the suspensions containing PEG-coated IONPs, considering that both produced particles are intended to be employed for magnetic targeting applications. The saturation magnetization of both IONPs was lower than the magnetite domain magnetization of 92 emu/g due to the surfactant and the dead surface magnetic layer. Under each investigated magnetic field (0, 34 and 183 mT), the shear viscosity behaviour of the MNP suspensions of both kinds was comparable. Shear thinning behaviour was seen for both particle suspensions in the low shear rate area (0.1 s−1 to 1 s−1). The rheological curves from this paper show that the suspensions present a higher viscosity at lower shear rates for spherical and cubic PEG-coated nanoparticles when a magnetic field is applied. The aggregation behaviour demonstrates that cubic-shaped IONPs are more stable throughout time, with hydrodynamic diameter measurements showing a relatively slow variation of the DLS size distribution from 250 nm to 210 nm in the first 600 s; contrarily, the hydrodynamic diameter of spherical IONPs fluctuated significantly, from 855 nm to 460 nm. Another key finding relates to the sedimentation profile, specifically that PEG-coated IONPs with spherical shapes have a stronger tendency to sediment than those with cubic forms, which are more stable.

Sedimentation

Saturation (graph theory)

10.3390/magnetochemistry9040099

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Citations (5)

Imagistic Analysis of Dental Adhesives Loaded with Nanoparticles Used on Teeth Sealing of Pits and Fissures with Resin Based Materials

Materiale Plastice (2019)

Roxana Oancea Cristian Zaharia A Somorjai Gabor Cosmin Sinescu Marius Mioc

Recent assessments show an increase in the incidence of tooth decay. In addition to prophylactic treatments using fluoride and diet focused on low sugar consumption, application of sealing materials to the teeth surfaces is the best protection against the appearance of dental caries on both temporary and permanent teeth.Tooth sealing applied using conventional method, plus the application of adhesive systems can lead to noticeable results over time.An increased thickness of the adhesive layer may lead to microinfiltration and implicitly to a failure of the dental caries protection therapy.Loading the dental adhesive with magnetic nanoparticles and applying it to the surface of the teeth with the help of a the magnetic field attempts to reduce and uniformize the thickness of the adhesive layer, which can lead to a reduced decrease in the occurrence of dental caries under the sealing materials for pit and fissures on the occlusal surfaces.

10.37358/mp.19.2.5205

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Citations (3)

Superparamagnetic Composites Based on Ionic Resin Beads/CaCO₃/Magnetite

Chemistry - A European Journal (2016)

Ion Bunia Vlad Socoliuc L. Vékás Florica Doroftei Cristian-Dragoş Varganici

Abstract The preparation of superparamagnetic composites obtained by CaCO 3 mineralization from supersaturate aqueous solutions is presented. The preparation was conducted in the presence of oleic acid stabilized magnetite nanoparticles as a water‐based magnetic fluid and insoluble templates as gel‐like cross‐linked polymeric beads. The presence of the magnetic particles in the composites provides a facile way for external manipulation using a permanent magnet, thus allowing the separation and extraction of magnetically modified materials. Two ion exchangers based on divinylbenzene/ethyl acrylate/acrylonitrile cross‐linked copolymer—a cation ion exchanger (CIE) and an amphoteric ion exchanger (AIE)—were used, as well as different addition orders of magnetite and CaCO 3 crystals growth precursors. The morphology of the composites was investigated by SEM, the polymorphs content by X‐ray diffraction, and the thermal stability by thermogravimetric analysis. Polymer, CaCO 3 , and magnetite in the composite particles were shown to be present by energy dispersive X‐ray (EDX), XPS, and TEM. The sorption capacity for Cu II ions was tested, as compared to samples prepared without magnetite.

Superparamagnetism

Magnetite Nanoparticles

10.1002/chem.201603779

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Citations (5)

The effect of long time exposure to light of a water-based ferrofluid on its low frequency complex magnetic permeability

Journal of Magnetism and Magnetic Materials (2020)

Vlad Socoliuc C.N. Marin

Ferrofluid

Photoelectric effect

10.1016/j.jmmm.2020.167635

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Citations (2)

Clustering in Water Based Magnetic Nanofluids: Investigations by Light Scattering Methods

AIP conference proceedings (2010)

Vlad Socoliuc Elena-Alina Moacă Camelia Podaru Andreea Dobra Camelia Daia

Nanosized magnetite particles, with mean physical diameter of about 7 nm, obtained by chemical coprecipitation procedure were dispersed in water carrier by applying sterical stabilization of particles in order to prevent their aggregation and to ensure colloidal stability of the systems. Different chain length (C12, C14, C18) carboxylic acids (lauric (LA), myristic (MA) and oleic (OA)) were used for double layer coating of magnetite nanoparticles. Structural and magnetic properties were investigated by electron microscopy (TEM), dynamical and static light scattering (DLS, SLS) and magnetometry (VSM) to evaluate the role of chain length and of the saturated/unsaturated nature of surfactant layers. Also investigated were two water based magnetic nanocomposites obtained by encapsulating the magnetic nanoparticles in polymers with different functional properties.

Coprecipitation

10.1063/1.3530065

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Pullulan: A versatile coating agent for superparamagnetic iron oxide nanoparticles

Journal of Applied Polymer Science (2015)

Sergiu Coseri Alina Spatareanu Liviu Săcărescu Vlad Socoliuc Ioan Sorin Stratulat

ABSTRACT Ultrasmall superparamagnetic iron oxide (Fe 3 O 4 ) nanoparticles coated by biocompatible pullulan (Pu‐USPIO) with sizes below 10 nm and having a magnetite core and a hydrophilic outer shell of pullulan were prepared. The formed Pu‐USPIOs were thoroughly characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, atomic force microscopy, and small‐angle X‐ray scattering experiments. The content of magnetic nanoparticles embedded into the pullulan matrix was determined by thermogravimetric analysis. Vibrating sample magnetometry analysis was used to evaluate the magnetic properties of the Pu‐USPIO samples. Because of the presence of pullulan, these nanoparticles could be conditioned in many versatile forms, from a clear solution to magnetic films, for potential applications, including magnetic hyperthermia mediators. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 42926.

Pullulan

Superparamagnetism

Thermogravimetric analysis

Iron oxide nanoparticles

Ferumoxytol

10.1002/app.42926

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Citations (18)

Synthesis and Characterization of Bioactive Magnetic Nanoparticles from the Perspective of Hyperthermia Applications

Magnetochemistry (2022)

Elena-Alina Moacă Vlad Socoliuc Dana Stoian Claudia Watz Daniela Flondor

Magnetic iron oxide nanoparticles were obtained for the first time via the green chemistry approach, starting from two aqueous extracts of wormwood (Artemisia absinthium L.), both leaf and stems. In order to obtain magnetic nanoparticles suitable for medical purposes, more precisely with hyperthermia inducing features, a synthesis reaction was conducted, both at room temperature (25 °C) and at 80 °C, and with two formulations of the precipitation agent. Both the quality and stability of the synthesized magnetic iron oxide nanoparticles were physiochemically characterized: phase composition (X-ray powder diffraction (XRD)), thermal behavior (thermogravimetry (TG) and differential scanning calorimetry (DSC)), electron microscopy (scanning (SEM) and transmission (TEM)), and magnetic properties (DC and HF-AC). The magnetic investigation of the as-obtained magnetic iron oxide nanoparticles revealed that the synthesis at 80 °C using a mixture of NaOH and NH3(aq) increases their diameter and implicitly enhances their specific absorption rate (SAR), a mandatory parameter for practical applications in hyperthermia.

Iron oxide nanoparticles

Magnetic hyperthermia

Thermogravimetry

10.3390/magnetochemistry8110145

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Citations (10)

Synthesis and characterization of γ-Fe2O3/SiO2 composites as possible candidates for magnetic paper manufacture

Ceramics International (2014)

Cornelia Păcurariu Elena-Alina Moacă Robert Ianoș Oana Marinică Ciprian-Valentin Mihali

Maghemite

Coprecipitation

Superparamagnetism

10.1016/j.ceramint.2014.09.031

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Citations (30)

Agglomerate formation in moderately concentrated ferrofluids from static magneto-optical measurements

Journal of Magnetism and Magnetic Materials (1999)

Vlad Socoliuc M. Raşa Victor Sofonea D. Bica L Osvath

Ferrofluid

Agglomerate

Micrography

10.1016/s0304-8853(98)00251-0

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Citations (43)

Calcium Carbonate–Magnetite–Chondroitin Sulfate Composite Microparticles with Enhanced pH Stability and Superparamagnetic Properties

Crystal Growth & Design (2013)

Marcela Mihai Vlad Socoliuc Florica Doroftei Elena‐Laura Ursu Magdalena Aflori

The CaCO3 microparticle growth from supersaturated aqueous solutions in the presence of oleic acid stabilized magnetite nanoparticles as a water-based magnetic fluid and a natural strong–weak polyanion, chondroitin sulfate A, has been investigated. The study follows the microparticle formation characteristics under different relative CaCO3–magnetite–polymer ratios. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to provide high resolution on particle morphology and distribution of magnetite in the composites and flow particle image analysis (FPIA) to evidence their mean size and circularity, whereas X-ray diffraction (XRD) and Raman spectroscopy were used to determine polymorph type and crystallite characteristics. Polymer and magnetite presence in the composite particles was evidenced by energy dispersive X-ray (EDX), TEM, particle charge density, and ζ potential. The magnetic properties of the obtained microparticles were also investigated. The pH stability of the new composites, given by the presence of acid oleic stabilized magnetite nanoparticles and polymer, has been followed by ζ potential variation.

Superparamagnetism

Microparticle

10.1021/cg400511d

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Citations (15)