In this paper,chemical co-precipitation method was employed to synthesize Fe3O4 nanoparticles which can be well dispersed in water by using citric acid as a surfactant.Afterwards,by using Fe3O4 nanoparticles as seeds ...In this paper,chemical co-precipitation method was employed to synthesize Fe3O4 nanoparticles which can be well dispersed in water by using citric acid as a surfactant.Afterwards,by using Fe3O4 nanoparticles as seeds in a Triton X-100/hexanol/cyclohexane/water reverse microemulsion system,the core-shell structural Fe3O4@SiO2 nanocomposite particles were prepared via hydrolysis and condensation of tetraethyl orthosilicate(TEOS) under the catalysis of alkali.The effects of different stirring methods and the concentration of TEOS on the morphology of Fe3O4@SiO2 nanoparticles were investigated.The results show that the mechanical stirring can effectively control the morphology of composite nanoparticles to form a good dispersion and spherical morphology of core-shell nanoparticles.With the increase of TEOS concentration,the thickness of the SiO2 shell increases,and the morphology of the composite particles becomes more uniform.展开更多
采用化学共沉积方法分别制备不含添加剂和含0.5%(质量分数)Cu O、Bi2O3、In2O3添加剂的Ag Sn O2(12)粉末,经等静压、烧结、挤压、拉拔至Φ1.38 mm规格线材后最终制成3×0.8+1.5×1.5规格的铆钉型触头,对线材硬度、电阻率、抗拉...采用化学共沉积方法分别制备不含添加剂和含0.5%(质量分数)Cu O、Bi2O3、In2O3添加剂的Ag Sn O2(12)粉末,经等静压、烧结、挤压、拉拔至Φ1.38 mm规格线材后最终制成3×0.8+1.5×1.5规格的铆钉型触头,对线材硬度、电阻率、抗拉强度、断后伸长率及其制打的铆钉型触头表面质量进行了检测和分析。展开更多
文摘In this paper,chemical co-precipitation method was employed to synthesize Fe3O4 nanoparticles which can be well dispersed in water by using citric acid as a surfactant.Afterwards,by using Fe3O4 nanoparticles as seeds in a Triton X-100/hexanol/cyclohexane/water reverse microemulsion system,the core-shell structural Fe3O4@SiO2 nanocomposite particles were prepared via hydrolysis and condensation of tetraethyl orthosilicate(TEOS) under the catalysis of alkali.The effects of different stirring methods and the concentration of TEOS on the morphology of Fe3O4@SiO2 nanoparticles were investigated.The results show that the mechanical stirring can effectively control the morphology of composite nanoparticles to form a good dispersion and spherical morphology of core-shell nanoparticles.With the increase of TEOS concentration,the thickness of the SiO2 shell increases,and the morphology of the composite particles becomes more uniform.
文摘采用化学共沉积方法分别制备不含添加剂和含0.5%(质量分数)Cu O、Bi2O3、In2O3添加剂的Ag Sn O2(12)粉末,经等静压、烧结、挤压、拉拔至Φ1.38 mm规格线材后最终制成3×0.8+1.5×1.5规格的铆钉型触头,对线材硬度、电阻率、抗拉强度、断后伸长率及其制打的铆钉型触头表面质量进行了检测和分析。
