Two-step single-reactor synthesis of oleic acid- or undecylenic acid-stabilized magnetic nanoparticles by thermal decomposition

• Mykhailo Nahorniak,
• Pamela Pasetto,
• Jean-Marc Greneche,
• Volodymyr Samaryk,
• Sandy Auguste,
• Anthony Rousseau,
• Nataliya Nosova and
• Serhii Varvarenko

Beilstein J. Nanotechnol. 2023, 14, 11–22, doi:10.3762/bjnano.14.2

• of maghemite nanoparticles. These observations agree with the result of the present study, confirming the monodisperse nature of the maghemite nanoparticles obtained. The TMU-V nanoparticle sample was also measured at 300 and 77 K (Figure 6), and the profiles differ from those observed for the TMO-I

Applications of superparamagnetic iron oxide nanoparticles in drug and therapeutic delivery, and biotechnological advancements

• Maria Suciu,
• Corina M. Ionescu,
• Alexandra Ciorita,
• Septimiu C. Tripon,
• Dragos Nica,
• Hani Al-Salami and
• Lucian Barbu-Tudoran

Beilstein J. Nanotechnol. 2020, 11, 1092–1109, doi:10.3762/bjnano.11.94

• reported no cytotoxicity, when not stimulated, and 15% cell viability in vitro and tumor reduction in vivo when activated by a laser. Horák and collaborators [169] used the toxicity of free Fe ions for antitumor activity. The authors synthesized maghemite nanoparticles covered with poly(N,N

Magnetic properties of biofunctionalized iron oxide nanoparticles as magnetic resonance imaging contrast agents

• Natalia E. Gervits,
• Andrey A. Gippius,
• Alexey V. Tkachev,
• Evgeniy I. Demikhov,
• Sergey S. Starchikov,
• Igor S. Lyubutin,
• Alexander L. Vasiliev,
• Vladimir P. Chekhonin,
• Maxim A. Abakumov,
• Alevtina S. Semkina and
• Alexander G. Mazhuga

Beilstein J. Nanotechnol. 2019, 10, 1964–1972, doi:10.3762/bjnano.10.193

• Mössbauer spectra are given in Table 2. For comparison, in Figure 9 we plot the 57Fe ZF-NMR spectrum of maghemite nanoparticles of about 10 nm in diameter measured at 4.2 K in [27] (blue dashed line) along with our spectra. The qualitative similarity of the two experimental spectra is obvious, especially

• coated nanoparticles. Experimental ZF-NMR spectrum of 57Fe nuclei measured at 4.2 K in our metal nanoparticles (MNPs). Open circles and green spheres correspond to our samples of the uncoated and HSA-coated nanoparticles, respectively. The blue dashed line is the spectrum of maghemite nanoparticles

• adopted from [27]; the red dashed line is the spectrum of maghemite nanoparticles adopted from [28]. Hyperfine parameters for two magnetic sextets calculated from the Mössbauer spectra at 10 K. Hhf is the magnetic hyperfine field at iron nuclei, Hmax is the value at the maximum of the field in the

Scavenging of reactive oxygen species by phenolic compound-modified maghemite nanoparticles

• Małgorzata Świętek,
• Yi-Chin Lu,
• Rafał Konefał,
• Liliana P. Ferreira,
• M. Margarida Cruz,
• Yunn-Hwa Ma and
• Daniel Horák

Beilstein J. Nanotechnol. 2019, 10, 1073–1088, doi:10.3762/bjnano.10.108

• . In conclusion, the high cellular uptake and the antioxidant properties associated with the phenolic moieties in the modified particles allow for a potential application in biomedical areas. Keywords: antioxidants; chitosan; maghemite nanoparticles; oxidative stress; phenolic compound; Introduction

Tungsten disulfide-based nanocomposites for photothermal therapy

• Tzuriel Levin,
• Hagit Sade,
• Rina Ben-Shabbat Binyamini,
• Maayan Pour,
• Iftach Nachman and
• Jean-Paul Lellouche

Beilstein J. Nanotechnol. 2019, 10, 811–822, doi:10.3762/bjnano.10.81

• magnetite nanoparticles into γ-maghemite (mag) nanoparticles. The cerium ion attaches to the nanoparticle, producing surface defects (an Fe–O–[CeLn] bond is formed). The cerium-doped maghemite nanoparticles are more stable than the non-doped ones, which tend to aggregate. In addition to the stabilization

• −1 may be assigned to C–O stretching vibrations. The peaks at around 1400 cm−1 and 1540 cm−1 are assigned to symmetric and asymmetric stretching vibrations of carboxylate [O–C–O]− ions. The positions of the peaks indicate attachment of the polymer ligand to the surface of the maghemite nanoparticles

• taken, and the values given include the average result and the standard deviation. Magnetization spectra of WS2-NTs, CAN-mag, and WS2-NT-CM, taken at 10 K. Inset is the magnetization spectra of WS2-NTs. ICP results for CAN-maghemite nanoparticles before and after conjugation to WS2 nanotubes. CAN

Cytotoxicity of doxorubicin-conjugated poly[N-(2-hydroxypropyl)methacrylamide]-modified γ-Fe₂O₃ nanoparticles towards human tumor cells

• Zdeněk Plichta,
• Yulia Kozak,
• Rostyslav Panchuk,
• Viktoria Sokolova,
• Matthias Epple,
• Lesya Kobylinska,
• Pavla Jendelová and
• Daniel Horák

Beilstein J. Nanotechnol. 2018, 9, 2533–2545, doi:10.3762/bjnano.9.236

• using a magnetic field allowing for easy separation and/or targeted delivery in the organism [26]. In this report, citrate-treated maghemite nanoparticles and a novel PHPMA-based surface coating were used to ensure biocompatibility, minimal immunogenicity and to provide reactive functional groups for

Photocatalysis applications of some hybrid polymeric composites incorporating TiO₂ nanoparticles and their combinations with SiO₂/Fe₂O₃

• Andreea Laura Chibac,
• Tinca Buruiana,
• Violeta Melinte and
• Emil C. Buruiana

Beilstein J. Nanotechnol. 2017, 8, 272–286, doi:10.3762/bjnano.8.30

• nanocatalysts. Keywords: hybrid polymer composites; maghemite nanoparticles; photocatalysis; TiO2 nanoparticles; UV–visible irradiation; Introduction Over the last years, titania nanomaterials have attracted a lot of attention as they have found numerous applications in the field of dye-sensitized solar cells

• , namely: nanocrystalline TiO2, TiO2 with Si–O–Si sequences (TiO2/SiO2), TiO2 with maghemite nanoparticles (TiO2/Fe2O3), and TiO2 with Si–O–Si and maghemite (TiO2/SiO2/Fe2O3). For the preparation of these composites premade nanoparticles were dispersed into urethane dimethacrylate followed by

• , inset), sustains the formation of TiO2 NPs where some small maghemite particles (about 2 to 5 nm) can be seen. The XRD pattern for the TiO2 nanoparticles linked through Si–O–Si sequences and combined with maghemite nanoparticles (Figure 1d) displays the characteristic reflection peaks for anatase, even

An efficient recyclable magnetic material for the selective removal of organic pollutants

• Clément Monteil,
• Nathalie Bar,
• Agnès Bee and
• Didier Villemin

Beilstein J. Nanotechnol. 2016, 7, 1447–1453, doi:10.3762/bjnano.7.136

• magnetic core. Polyethylenimine is phosphonated at different percentages by a one-step process and used to coat maghemite nanoparticles. It selectively extracts high amounts of cationic and anionic contaminants over a wide range of pH values, depending on the adjustable number of phosphonate groups

• preparation and conditions of the studies The novelty of this contribution consists in the use of PEI with phosphonic groups allowing a solid grafting of PEI on the maghemite nanoparticles, by the formation of strong covalent P–O–Fe bonds. The presence of these negative phosphonic groups ensures the stability

• millimetre-sized beads in which many maghemite nanoparticles are often incorporated in a polymeric network. Interpretation of the pH-responsive pollutant extraction To understand these results, a diagram predicting the specific interactions between particles and dyes according to the pH value is showed in

Improved biocompatibility and efficient labeling of neural stem cells with poly(L-lysine)-coated maghemite nanoparticles

• Igor M. Pongrac,
• Marina Dobrivojević,
• Lada Brkić Ahmed,
• Michal Babič,
• Miroslav Šlouf,
• Daniel Horák and
• Srećko Gajović

Beilstein J. Nanotechnol. 2016, 7, 926–936, doi:10.3762/bjnano.7.84

• . Their properties can be modified by coating with different biocompatible polymers. To test if a coating polymer, poly(L-lysine), can improve the biocompatibility of nanoparticles applied to neural stem cells, poly(L-lysine)-coated maghemite nanoparticles were prepared and characterized. We evaluated

• intracellular uptake of iron oxide in neural stem cells. The methyl thiazolyl tetrazolium assay and the calcein acetoxymethyl ester/propidium iodide assay demonstrated that poly(L-lysine)-coated maghemite nanoparticles scored better than nanomag®-D-spio in cell labeling efficiency, viability and proliferation

• labeling makes poly(L-lysine)-coated maghemite nanoparticles appropriate candidates for future neural stem cell in vivo tracking studies. Keywords: dextran; maghemite; nanoparticles; neural stem cells; poly(L-lysine); Introduction Stem cell-based therapy is a developing area of regenerative medicine with

Surface coating affects behavior of metallic nanoparticles in a biological environment

• Darija Domazet Jurašin,
• Marija Ćurlin,
• Ivona Capjak,
• Tea Crnković,
• Marija Lovrić,
• Michal Babič,
• Daniel Horák,
• Ivana Vinković Vrček and
• Srećko Gajović

Beilstein J. Nanotechnol. 2016, 7, 246–262, doi:10.3762/bjnano.7.23

• of metallic NP transformation. Our results highlight the importance of physicochemical characterization and stability evaluation of metallic NPs in a variety of biological systems including as many NP properties as possible. Keywords: biological fluids; colloidal stability; maghemite; nanoparticles

• using ultracentrifugation. Three different maghemite nanoparticles (γ-Fe2O3NPs), uncoated, coated with poly(L-lysine) and D-mannose, were prepared by coprecipitation of FeCl2 and FeCl3 using ammonium hydroxide, followed by the oxidation of the resulting magnetite with sodium hypochlorite [46][47]. The

• ) sulfosuccinate (AOT), poly(vinylpyrrolidone) (PVP), Brij 35 (Brij), Tween 20 (Tween), bovine serum albumin (BSA), poly(L-lysine) (PLL), cetyltrimethylammonium bromide (CTA) and D-mannose (MAN). Summarized effects of different coating agents on the stability of silver and maghemite nanoparticles in model

Influence of surface-modified maghemite nanoparticles on in vitro survival of human stem cells

• Michal Babič,
• Daniel Horák,
• Lyubov L. Lukash,
• Tetiana A. Ruban,
• Yurii N. Kolomiets,
• Svitlana P. Shpylova and
• Oksana A. Grypych

Beilstein J. Nanotechnol. 2014, 5, 1732–1737, doi:10.3762/bjnano.5.183

• report is to describe the labeling of human fibroblast-like cells with new surface-modified superparamagnetic maghemite nanoparticles both before and after their surface coating with D-mannose or poly(N,N-dimethylacrylamide) and to determine the survival of the cells. Possible cytotoxic effects of the

• ,N-dimethylacrylamide (DMAAm) in the presence of maghemite nanoparticles using 4,4'-azobis(4-cyanovaleric acid) initiator. The particles were examined with a JEOL JEM 200 CX transmission electron microscope (TEM; Tokyo, Japan) to determine the particle size and polydispersity; at least 500 particles

Manipulation of isolated brain nerve terminals by an external magnetic field using D-mannose-coated γ-Fe₂O₃ nano-sized particles and assessment of their effects on glutamate transport

• Tatiana Borisova,
• Natalia Krisanova,
• Arsenii Borуsov,
• Roman Sivko,
• Ludmila Ostapchenko,
• Michal Babic and
• Daniel Horak

Beilstein J. Nanotechnol. 2014, 5, 778–788, doi:10.3762/bjnano.5.90

• Molecular Probes (USA); Ficoll 400, L-[14C]glutamate, aqueous counting scintillant (ACS) were from Amersham (UK). Analytical grade salts were from Sigma-Aldrich (USA). Synthesis of D-mannose-coated superparamagnetic maghemite nanoparticles An aqueous solution of 0.2 M FeCl3 (100 mL) was mixed with of 0.5 M

Uniform excitations in magnetic nanoparticles

• Steen Mørup,
• Cathrine Frandsen and
• Mikkel Fougt Hansen

Beilstein J. Nanotechnol. 2010, 1, 48–54, doi:10.3762/bjnano.1.6

• = 2 T. [Reprinted with permission from Lefmann, K.; Bødker, F.; Klausen, S. N.; Hansen, M. F.; Clausen, K. N.; Lindgård, P.-A.; Mørup, S. A neutron scattering study of spin precession in ferrimagnetic maghemite nanoparticles Europhys. Lett. 2001, 54, 526–532. Copyright (2001) by EDP Sciences.] The

• with increasing temperature. At low temperatures the relative area of the inelastic peaks in zero applied field is given by [23] When magnetic fields are applied at 200 K, the inelastic peaks are shifted to higher energies, and their relative intensity decreases as for ferrimagnetic maghemite

• nanoparticles (Figure 4). The energy of the uniform excitations in antiferromagnetic materials, Equation 16, was derived assuming that the antiferromagnetic material had zero net magnetization, but nanoparticles of antiferromagnetic materials usually have a magnetic moment because of uncompensated spins, for