硅碳烷树枝状液晶的研究

A liquid crystalline carbosilane dendrimer has been synthesized in successive steps, resulting in the formation of defined, unimolecular compound. 12 AZO-meso-units were attached on its periphery and it has a three dimentional, tree-like, starburst structure.Its phase behavior was K64 Sx115 SA123N138I. Compared with its AZO-meso-unit, 4-nitro-4’- (llydroxyhexyl)-azobenzene, whose phase behavior was K122N132I, its phase range was enlarged about 64 ℃ and two more liquid crystalline phases SA Sx were found.

香橼中β-胡萝卜素含量的反相高效液相色谱测定

用反相高效液相色谱对香橼中的β -胡萝卜素进行了测定 ,所用方法快速、便捷 ,回收率在 ( 10 6.8± 0 .70 ) % 。

少量液相对Sm(Co_余Fe_(0.22)Cu_(0.08)Zr_(0.025))_(7.22)烧结磁体的影响

分析了少量液相[Sm60% (质量分数 ) +Co40% (质量分数 )]对Sm(Co 余Fe0.22Cu0.08Zr0.025) 7.22烧结磁体的磁性能、相结构、微结构的影响。研究表明 :少量液相的加入 ,磁体相结构大致不变 ,磁体晶界尺寸变大 ,同时在晶界处有Cu元素富集 ,使得胞状组织中边界相的Cu含量减少,导致磁体的矫顽力急剧下降 ,因而导致了磁体室温磁性能的下降。