نتایج جستجو برای: precursors
تعداد نتایج: 39041 فیلتر نتایج به سال:
Here we present our experimental results in synthesizing Au-Cu nano-particles with tunable localized surface plasmon resonance frequency through wet-chemical at temperature room. The reaction is performed in the presence of ascorbic acid as a reducing agent and polyvinyl pyrrolidone as capping agent via four different procedures: (1) mixture of 90% HAuCl4 and 10% CuSO4.5H2O precursors, (2) mixt...
Hematopoietic thymocyte precursors: IV. Enrichment of the precursors and evidence for heterogeneity.
Copper-manganese oxide catalysts are prepared with an atomic ratio of Cu/Mn=2/1 using a coprecipitation procedure under air atmosphere. The time of aging, i.e., the time that precipitate remains in contact with the precipitating medium, has been varied from 0 (for unaged precursor) to 300 minutes and the effect of precipitate aging time in each atmosphere upon the structure and morphology of di...
In this research, sol-gel bioactive glass in SiO2 �-P2O5 ? CaO - Na2O system using common nitrate precursors was investigated. Some parameters like water/alcohol/TEOS ratio, type of catalyst (acid or alkali) and temperature of heat treatment were also studied. Various precursors such as acetates, carbonates and chlorides were utilized to introduce Ca and Na in glass composition. Characterizatio...
CrN/Cu composite powders were synthesized by employing a novel two-step technique. Firstly, the Cr2O3+CuO precursors were prepared by the solution combustion synthesis (SCS) method using cupric nitrate, urea, and chromium nitrate as initial materials. Subsequently, the SCS precursors were calcined at 850 °C in NH3 for 6 h, and transformed to CrN/Cu composite powders. The composite powders consi...
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