排序方式: 共有15条查询结果,搜索用时 312 毫秒
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M. R. Gafurov T. B. Biktagirov G. V. Mamin D. V. Shurtakova E. S. Klimashina V. I. Putlyaev S. B. Orlinskii 《Physics of the Solid State》2016,58(3):469-474
The effect of codoping of hydroxyapatite (HAP) nanocrystals with average sizes of 35 ± 15 nm during “wet” synthesis by CO32? carbonate anions and Mn2+ cations on relaxation characteristics (for the times of electron spin–spin relaxation) of the NO32? nitrate radical anion has been studied. By the example of HAP, it has been demonstrated that the electron paramagnetic resonance (EPR) is an efficient method for studying anion–cation (co)doping of nanoscale particles. It has been shown experimentally and by quantummechanical calculations that simultaneous introduction of several ions can be energetically more favorable than their separate inclusion. Possible codoping models have been proposed, and their energy parameters have been calculated. 相似文献
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Preobrazhensky I. I. Tikhonov A. A. Klimashina E. S. Evdokimov P. V. Putlyaev V. I. 《Russian Chemical Bulletin》2020,69(8):1601-1603
Hydrogels filled with CaHPO4 · 2H2O and Ca8(HPO4)2(PO4)4 · 5H2O were synthesized from the acrylate derivatives of poly(ethylene glycol) by the photopolymerization method. The swelling behaviour of the filled and unfilled hydrogels in water was studied. The solubility of the photoinitiator in water and in the monomers was estimated.
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Yavkin BV Mamin GV Orlinskii SB Gafurov MR Salakhov MKh Biktagirov TB Klimashina ES Putlayev VI Tretyakov YD Silkin NI 《Physical chemistry chemical physics : PCCP》2012,14(7):2246-2249
W-band pulsed EPR and ENDOR investigations of X-ray irradiated nanoparticles of synthetic hydroxyapatite Ca(9)Pb(PO(4))(6)(OH)(2) are performed. It is shown that in the investigated species lead ions probably replace the Ca(1) position in the hydroxyapatite structure. 相似文献
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M. Gafurov T. Biktagirov B. Yavkin G. Mamin Y. Filippov E. Klimashina V. Putlayev S. Orlinskii 《JETP Letters》2014,99(4):196-203
Synthesized by the wet chemical precipitation technique, hydroxyapatite (HAp) powders with the sizes of the crystallites of 20–50 nm and 1 μm were analyzed by different analytical methods. By means of electron paramagnetic resonance (EPR) it is shown that during the synthesis process nitrate anions from the reagents (byproducts) could incorporate into the HAp structure. The relaxation times and EPR parameters of the stable axially symmetric NO 3 2? paramagnetic centers detected after X-ray irradiation are measured with high accuracy. Analyses of high-frequency (95 GHz) electron-nuclear double resonance spectra from 1H and 31P nuclei and ab initio density functional theory calculations allow suggesting that the paramagnetic centers and nitrate anions as the precursors of NO 3 2? radicals preferably occupy PO 4 3? site in the HAp structure. 相似文献
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