An adapted Coffey model for studying susceptibility losses in interacting magnetic nanoparticles

• Mihaela Osaci and
• Matteo Cacciola

Beilstein J. Nanotechnol. 2015, 6, 2173–2182, doi:10.3762/bjnano.6.223

• basis for practical magnetic hyperthermia than small nanoparticles [6]. Usually, the magnetite nanoparticles used in hyperthermia have a diameter above 53 nm but below the diameter above which objects are no more considered to be “nano” (100 or 200 nm, according to the bibliographic sources). Actually

• , magnetite is considered the most favourable material in magnetic hyperthermia. At about 30 nm particle diameter the behaviour of magnetite nanoparticles changes from single-domain to multi-domain state [7], representing the critical dimension of magnetite-based nanoparticles. The tendency for agglomeration

Thermal treatment of magnetite nanoparticles

• Beata Kalska-Szostko,
• Urszula Wykowska,
• Dariusz Satula and
• Per Nordblad

Beilstein J. Nanotechnol. 2015, 6, 1385–1396, doi:10.3762/bjnano.6.143

• /bjnano.6.143 Abstract This paper presents the results of a thermal treatment process for magnetite nanoparticles in the temperature range of 50–500 °C. The tested magnetite nanoparticles were synthesized using three different methods that resulted in nanoparticles with different surface characteristics

• stability properties were compared. In this study, two sets of unmodified magnetite nanoparticles were used where crystallinity was as determinant of the series. For the third type of particles, a Ag shell was added. By comparing the coated and uncoated particles, the influence of the metallic layer on the

• cannot be made [16]. In this paper, tests of three different kinds of magnetite nanoparticles and their behavior at higher temperatures starting from 50 °C up to 500 °C have been selected. Some changes in differential scanning calorimetry (DSC) cycles have been observed in our previous measurements [21

Multifunctional layered magnetic composites

• Maria Siglreitmeier,
• Baohu Wu,
• Tina Kollmann,
• Martin Neubauer,
• Gergely Nagy,
• Dietmar Schwahn,
• Vitaliy Pipich,
• Damien Faivre,
• Dirk Zahn,
• Andreas Fery and
• Helmut Cölfen

Beilstein J. Nanotechnol. 2015, 6, 134–148, doi:10.3762/bjnano.6.13

• Potsdam, Germany 10.3762/bjnano.6.13 Abstract A fabrication method of a multifunctional hybrid material is achieved by using the insoluble organic nacre matrix of the Haliotis laevigata shell infiltrated with gelatin as a confined reaction environment. Inside this organic scaffold magnetite nanoparticles

• oxide mineral phases incorporated into a protein–polysaccharide matrix. Especially, magnetite nanoparticles that are present in large amounts (ca. 70 wt %) at the tooth cap, covering the cutting surface, are responsible for the outstanding mechanical performance [5]. There are many approaches to produce

• nacre scaffold [3]. Inside this organic gelatin matrix we synthesize magnetite nanoparticles to form a highly mineralized organic–inorganic hybrid body. The resulting material should mimic the fracture resistance of nacre and the hardness and abrasion resistance of the chiton teeth. Results and

Nanoencapsulation of ultra-small superparamagnetic particles of iron oxide into human serum albumin nanoparticles

• Matthias G. Wacker,
• Mahmut Altinok,
• Stephan Urfels and
• Johann Bauer

Beilstein J. Nanotechnol. 2014, 5, 2259–2266, doi:10.3762/bjnano.5.235

• molecules [14]. Since the HSA molecule is negatively charged during desolvation process, positively charged compounds demonstrate a high affinity to the matrix material [13]. Therefore, magnetite nanoparticles have been modified in order to increase charge–charge interactions between USPIO and the matrix

• = 6 nm). Additionally, the specific (mass dependant) magnetization of the particles was determined at a temperature of 300 K (Figure 2). Surface modification of magnetite nanoparticles Iron oxide nanoparticles were chemically modified by using a combination of citrate and tetramethylammonium hydroxide

• , Germany). Magnetite particles were friendly provided by Merck KGaA (Darmstadt, Germany). All reagents were of analytical grade and used as received. Characterization of magnetite nanoparticles by powder X-ray diffraction The PXRD pattern of the dried magnetite nanoparticles was measured by using a Stoe

Imaging the intracellular degradation of biodegradable polymer nanoparticles

• Anne-Kathrin Barthel,
• Martin Dass,
• Melanie Dröge,
• Jens-Michael Cramer,
• Daniela Baumann,
• Markus Urban,
• Katharina Landfester,
• Volker Mailänder and
• Ingo Lieberwirth

Beilstein J. Nanotechnol. 2014, 5, 1905–1917, doi:10.3762/bjnano.5.201

• nanoparticles marked with a fluorescent dye for fluorescence-based measurements, and additionally decorated with magnetite nanoparticles on the surface [17]. Hydrolysis of the PLLA releases the magnetite nanoparticles, serving as an indicator for PLLA degradation. As a model cellular system, mesenchymal stem

• were composed of poly(L-lactic acid) (PLLA), decorated with approximately 25 nm-sized magnetite nanoparticles, prepared by combining miniemulsion and emulsion–solvent evaporation techniques. The particles were labeled with the fluorescent dye, N-(2,6-diisopropylphenyl)perylene-3,4-dicarboximide (PMI

PEGylated versus non-PEGylated magnetic nanoparticles as camptothecin delivery system

• Paula M. Castillo,
• Mario de la Mata,
• Maria F. Casula,
• José A. Sánchez-Alcázar and
• Ana P. Zaderenko

Beilstein J. Nanotechnol. 2014, 5, 1312–1319, doi:10.3762/bjnano.5.144

• succinic acid as stabilizing agent during the synthesis of magnetite nanoparticles decorates their surface with acid molecules. Nevertheless, the amount of succinic acid that has been attached to the surface is low, as can be judged from the IR data available [41]. Given that the amount of succinic linkers

• on the nanoparticle surface limits the uptake of PEG, it is crucial to ensure higher amounts of carboxylic groups on the nanoparticle surface. In order to increase the acid coating, we have investigated a different approach which relies on the direct incubation of previously synthesized magnetite

• nanoparticles with the acid in aqueous medium, instead of including it into the co-precipitation reaction medium. By this approach we were able to obtain USM-Suc nanoparticles whose surface is densely covered with carboxylic acid. Figure 4 shows the FTIR spectra of USM-Suc and succinic acid in the most commonly

Antimicrobial nanospheres thin coatings prepared by advanced pulsed laser technique

• Alina Maria Holban,
• Valentina Grumezescu,
• Alexandru Mihai Grumezescu,
• Bogdan Ştefan Vasile,
• Roxana Truşcă,
• Rodica Cristescu,
• Gabriel Socol and
• Florin Iordache

Beilstein J. Nanotechnol. 2014, 5, 872–880, doi:10.3762/bjnano.5.99

• by the readings of three values/experimental variants. Two-way ANOVA and Tukey’s multiple comparison tests were used for revealing significant differences among the analyzed groups. Results and Discussion The morphology and size of magnetite nanoparticles was analyzed by TEM. We confirmed the

• initial phase and during biofilm maturation. S. aureus (Figure 7) biofilms were significantly impaired at all tested points of time, while P. aeruginosa (Figure 8) biofilms are especially affected after 24 and 48 h of incubation. Even though magnetite nanoparticles displayed a great antimicrobial effect

• ) bacteria strains. Moreover, the obtained nano-coatings showed a good biocompatibility and facilitated the normal development of human endothelial cells. These nanosystems may be used as efficient alternatives in treating and preventing bacterial infections. Keywords: antimicrobial; chitosan; magnetite