Thermal and spectral features of nickel compounds synthesized within the pores of photonic crystals based on SiO 2статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Авторы:
Zakharov A.N. ,
Maiorova A.F. ,
Kharlanov A.N. ,
Kalmykov K.B.
Журнал:
Russian Journal of Physical Chemistry A
Том:
85
Номер:
10
Год издания:
2011
Издательство:
Pleiades Publishing, Ltd
Местоположение издательства:
Road Town, United Kingdom
Первая страница:
1679
Последняя страница:
1688
DOI:
10.1134/S0036024411100335
Аннотация:
Nanoparticles of NiC 2O 4 2H 2O were obtained within the interspheric voids of synthetic opal polycrystalline samples based on SiO 2. The thermal decomposition of NiC 2O 4 · 2H 2O inclusions within the pores of crystallites was studied by means of thermal gravimetry and differential scanning calorimetry under static conditions in atmospheres of He and air. The efficient activation energy of dehydration (180 ± 10 kJ mol -1) and dehydration enthalpy of nickel oxalate crystalline hydrate (69.9 kJ mol -1) within the pores of pho-tonic crystals based on SiO 2 were calculated. Pyrolysis of the nickel oxalate led to the formation of NiO nano-particles within the voids and on the external surface of the photonic crystallites. The behavior of polycrys-talline samples of the photonic crystals in a medium of immersion liquids was studied. It was shown that the partial population of the interspheric pores of photonic crystals with NiC 2O 4 · 2H 2O, NiO, and Ni that diffuse visible light do not lead to a total loss of light conductivity in the immersion medium. The diffuse reflection spectra of a sample of photonic crystals populated with NiC 2O 4 · 2H 2O and NiO phases were recorded. A sample of photonic crystals with inclusions of metallic nickel particles exhibiting magnetic properties was obtained by treating nickel oxide-containing synthetic opal based on SiO 2 with molecular hydrogen. © 2011 Pleiades Publishing, Ltd.
Добавил в систему:
Калмыков Константин Борисович