“…The saturation magnetization was determined to be 8.7 emu/g, lower than that of bulk γ-Fe 2 O 3 (76 emu/g). The decrease of the saturation magnetization has also been observed in previous reports about γ-Fe 2 O 3 nanocrystals, , which can be attributed to their nanoscale dimension as well as their low weight content in the product. 8 Room-temperature magnetic loop of ZnO/ZnS nanoribbons decorated by γ-Fe 2 O 3 clusters.…”
This manuscript presents the preparation and characterization of polycrystalline ZnO/ZnS nanoribbons decorated by γ-Fe 2 O 3 clusters. The weight percentages of ZnO, ZnS, and γ-Fe 2 O 3 in the product were 22.2, 69.3, and 8.5%, respectively. The nanoribbons were synthesized by a two-step, solution-based method. First, porous ZnO/ZnS microspheres were solvothermally prepared. Then, Fe 2+ and Fe 3+ ions were transferred into the microspheres due to their porous property and good adsorption ability. Finally, a mineralizer such as ethylenediamine or aqueous ammonia or urea was introduced into the system to promote the mineralization of Fe 2+ and Fe 3+ ions as well as the transformation of microspheres into nanoribbons. Through tracing the morphology evolution of porous microspheres to nanoribbons by transmission electron microscopy, the growth of the nanoribbons is clarified to be dominated by a dissolution-reconstruction mechanism. The measurements of the optical and magnetic properties revealed that these nanoribbons are bifunctional and have integrated the photoluminescent effect of ZnO and ZnS and the ferromagnetism of γ-Fe 2 O 3 .
“…The saturation magnetization was determined to be 8.7 emu/g, lower than that of bulk γ-Fe 2 O 3 (76 emu/g). The decrease of the saturation magnetization has also been observed in previous reports about γ-Fe 2 O 3 nanocrystals, , which can be attributed to their nanoscale dimension as well as their low weight content in the product. 8 Room-temperature magnetic loop of ZnO/ZnS nanoribbons decorated by γ-Fe 2 O 3 clusters.…”
This manuscript presents the preparation and characterization of polycrystalline ZnO/ZnS nanoribbons decorated by γ-Fe 2 O 3 clusters. The weight percentages of ZnO, ZnS, and γ-Fe 2 O 3 in the product were 22.2, 69.3, and 8.5%, respectively. The nanoribbons were synthesized by a two-step, solution-based method. First, porous ZnO/ZnS microspheres were solvothermally prepared. Then, Fe 2+ and Fe 3+ ions were transferred into the microspheres due to their porous property and good adsorption ability. Finally, a mineralizer such as ethylenediamine or aqueous ammonia or urea was introduced into the system to promote the mineralization of Fe 2+ and Fe 3+ ions as well as the transformation of microspheres into nanoribbons. Through tracing the morphology evolution of porous microspheres to nanoribbons by transmission electron microscopy, the growth of the nanoribbons is clarified to be dominated by a dissolution-reconstruction mechanism. The measurements of the optical and magnetic properties revealed that these nanoribbons are bifunctional and have integrated the photoluminescent effect of ZnO and ZnS and the ferromagnetism of γ-Fe 2 O 3 .
“…In general, they are all responsible for a wide variety of anomalous magnetic properties with respect to those of the bulk material such as a reduction of the saturation magnetization (i.e. being smaller than 85 emu/g for bulk maghemite), high coercivity, elongation of the hysteresis loops with high closure fields, high values of the differential susceptibility [47][48][49][50], etc.…”
“…A avaliação e a influência do suporte, em relação à área superficial e ao tamanho de poros evidencia que elevadas áreas e estruturas mesoporosas favorecem a reação de SFT, dado o fato de permitirem maior dispersão do metal e acesso dos reagentes e produtos aos poros do catalisador (Griboval-Constanta et al, 2002). A partir da descoberta dos materiais mesoporosos chamados de família M41S, novos sólidos mesoporosos têm sido sintetizados, expandindo significativamente seus potenciais de aplicação em diversos campos, entre eles, a sílica mesoporosa com estrutura hexagonal altamente ordenada chamada de SBA-15, tem se destacado nos últimos tempos (Jung et al, 2004). Diante da necessidade de novas rotas de produção de peneiras moleculares, a cinza da casca de arroz, produto de resíduos sólidos da indústria de geração de energia, mostra-se promissora como subsídio à síntese de materiais mesoporosos.…”
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