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Alicja Nejman Anna Baranowska-Korczyc Katarzyna Ranoszek-Soliwoda Izabela Jasiska Grzegorz Celichowski Magorzata Cielak 《Molecules (Basel, Switzerland)》2022,27(6)
New functionalization methods of meta- and para-aramid fabrics with silver nanowires (AgNWs) and two silanes (3-aminopropyltriethoxysilane (APTES)) and diethoxydimethylsilane (DEDMS) were developed: a one-step method (mixture) with AgNWs dispersed in the silane mixture and a two-step method (layer-by-layer) in which the silanes mixture was applied to the previously deposited AgNWs layer. The fabrics were pre-treated in a low-pressure air radio frequency (RF) plasma and subsequently coated with polydopamine. The modified fabrics acquired hydrophobic properties (contact angle ΘW of 112–125°). The surface free energy for both modified fabrics was approximately 29 mJ/m2, while for reference, meta- and para-aramid fabrics have a free energy of 53 mJ/m2 and 40 mJ/m2, respectively. The electrical surface resistance (Rs) was on the order of 102 Ω and 104 Ω for the two-step and one-step method, respectively. The electrical volume resistance (Rv) for both modified fabrics was on the order of 102 Ω. After UV irradiation, the Rs did not change for the two-step method, and for the one-step method, it increased to the order of 1010 Ω. The specific strength values were higher by 71% and 63% for the meta-aramid fabric and by 102% and 110% for the para-aramid fabric for the two-step and one-step method, respectively, compared to the unmodified fabrics after UV radiation. 相似文献
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Anna Baranowska-Korczyc Anna Reszka Kamil Sobczak Bo?ena Sikora Piotr Dziawa Marta Aleszkiewicz ?ukasz K?opotowski Wojciech Paszkowicz Piotr D?u?ewski Bogdan J. Kowalski Tomasz A. Kowalewski Maciej Sawicki Danek Elbaum Krzysztof Fronc 《Journal of Sol-Gel Science and Technology》2012,61(3):494-500
We demonstrate structural and room temperature magnetic properties of Fe doped ZnO nanofibers (NFs) obtained by electrospinning followed by calcination. The observed NFs, formed from crystalographically oriented, approximately 4.5?nm particles conglomerates, were approximately 200?nm in diameter. The reported synthesis of room temperature ferromagnetic Fe doped ZnO NFs is both facile and economical, and is therefore suggested as a generic method of fabricating biocompatible magnetic materials. The major substrates selected for the NFs synthesis (Zn, Fe) comprised of relatively low toxicity materials. Incorporating 10% Fe into ZnO does not modify the wurtzite crystal structure of the host material. No evidence of impurity phase was detected by either X-ray or electron diffraction. Magnetometry studies and Magnetic Force Microscopy imaging reveal a local ferromagnetic order that persists up to room temperature. We suggest that the observed phenomenon is either due to a mechanism mediated by presence of oxygen vacancies and/or is related to iron-rich precipitates. 相似文献
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Sikora Bożena Fronc Krzysztof Kaminska Izabela Baranowska-Korczyc Anna Sobczak Kamil Dłużewski Piotr Elbaum Danek 《Journal of Sol-Gel Science and Technology》2012,61(1):197-205
We have studied the synthesis of ZnO nanostructures over a wide range of parameters to determine the kinetics of the nanocrystals
growth. The initial rapid nucleation and growth is kinetically controlled, the subsequent ZnO nanocrystals growth is thermodynamically
controlled through the diffusion limited Ostwald coarsening. The ZnO coarsening rates increased with number of alcohol’s alkyl
group carbons and temperature increase, pointing to importance of the solvent viscosity, dielectric constants, surface energy
and the bulk solubility. The results are consistent with the Lifshitz–Slyozov–Wagner model. For all alcohols, in the NaOH
induced reaction, a lower activation energy was observed compared to the aqueous reaction. A lower ZnO solubility, obtained
by the water synthesis could be responsible for these observations. Our results point to the importance of the reactant selection
in controlling the kinetics of the nanostructure formation, their size and the nature of the surface defects responsible for
their luminescence. 相似文献
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