期刊文献+
共找到1篇文章
< 1 >
每页显示 20 50 100
Preparation and Characterization of SiO2-coated 2,4-H exa diyn- 1,6-bis( ethylurea ) Mic rocapsules
1
作者 CHENG Huan ZHU Guangming 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2014年第3期431-436,共6页
A novel kind of time-temperature indicator, SiO2-coated 2,4-hexadiyn-1,6-bis(ethylurea) microcapsules, has been fabricated by coating SiO2 on 2,4-hexadiyn-1,6-bis(ethylurea). This kind of microcapsules is a model ... A novel kind of time-temperature indicator, SiO2-coated 2,4-hexadiyn-1,6-bis(ethylurea) microcapsules, has been fabricated by coating SiO2 on 2,4-hexadiyn-1,6-bis(ethylurea). This kind of microcapsules is a model hydrophilic indicator, its stability is improved. And temperature-induced color change is irreversible even under varying irradiation. The influences of ammonia, tetraethyl orthosilicate(TEOS) and temperature on the product have been investigated. 2,4-Hexadiyn-1,6-bis(ethylurea) and the coated particles have been characterized by means of elemental analysis, mass spectrum, FTIR and Raman spectra and DSC, SEM, TEM and DLS analyses. The results indicate that 2,4-hexadiyn-1,6-bis(ethylurea)/SiO2 ratios, ammonia concentration and temperature could modulate the monodis- persity and size of the microcapsules. The experiments indicate that when the molar ratio of 2,4-hexadiyn- 1,6-bis(ethylurea)/SiO2/ammonia is 1:3:3.5 and temperature is 40℃ , the obtained microcapsules are well coated with the best monodispersity. Such sustained-release and hydrophilic microcapsules have very good prospects as a novel time-temoerature chromatic indicator. 展开更多
关键词 2 4-Hexadiyn-1 6-bis(ethylurea sio2 2 4-Hexadiyn-1 6-bis(ethylurea)/sio2 microcapsule
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部