One-pot spontaneous formation of submicron hexane-dispersible silica particles with the aid of amphiphilic reaction solvent
One-pot spontaneous formation of submicron hexane-dispersible silica particles with the aid of amphiphilic reaction solvent
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两亲性反应溶剂一锅法自发形成亚微米己烷分散二氧化硅颗粒
DOI：
10.1016/j.colsurfa.2018.05.053
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Kurumada Kenichi
中科院分区：
文献类型：
--
作者：
Yamauchi Noriko;Yachi Takehiro;Kurumada Kenichi
以正硅酸乙酯（TEOS）和己基三甲氧基硅烷（HTMS）为原料，二乙胺为催化剂，采用刘易斯碱性两亲性反应溶剂，制备了疏水性亚微米杂化SiO2粒子。所获得的杂化二氧化硅颗粒以初级颗粒分散体的形式稳定地分散在非极性溶剂如己烷中。溶剂二乙胺不仅用作硅烷醇缩聚的催化剂，而且在整个形成过程中用作疏水性杂化二氧化硅颗粒的初级颗粒分散的上级分散剂。在二乙胺中加入TEOS、HTMS和水后，超声处理30 s促进颗粒成核。然后，在核的分散体保持静止24 h后，自发形成均匀尺寸的亚微米疏水杂化二氧化硅颗粒。杂化二氧化硅颗粒的表面变得越来越疏水。这是因为表面附近的非极性侧基（己基）密度较高，这是由于三官能HTMS的反应性低于四官能TEOS的反应性。使用二乙胺的优点总结如下：1）由于二乙胺强烈催化硅烷醇缩合，颗粒表面彻底疏水化。2)由于疏水化颗粒与二乙胺具有良好的亲和性，因此杂化二氧化硅颗粒保持稳定地分散在其中。此外，即使在杂化二氧化硅颗粒风干后，它们也以分散的初级颗粒的形式再分散在己烷中。
Hydrophobic submicron hybrid silica particles were spontaneously formed in the mixture of tetraethylorthosilicate (TEOS) and hexyltrimethoxysilane (HTMS) dissolved in diethylamine, which works as a catalytic Lewis basic amphiphilic reaction solvent. The obtained hybrid silica particles were stably dispersed in non-polar solvent such as hexane in the form of the primary-particle dispersion. The solvent diethylamine functioned not only as the catalyst for the silanol polycondensation but also as a superior dispersant for the primary-particle dispersion of the hydrophobic hybrid silica particles throughout the formation process. After the addition of TEOS, HTMS and water in diethylamine, the particle nucleation was promoted the ultrasonication for 30 s. Then, the uniform-sized submicron hydrophobic hybrid silica particles were spontaneously formed after the dispersion of the nuclear was kept still for 24 h. The surface of the hybrid silica particles became increasingly hydrophobic. This is because of the higher density of the non-polar pendant groups (hexyl groups) in the vicinity of the surface, which results from the lower reactivity of trifunctional HTMS than that of tetrafunctional TEOS. The merits of using diethylamine are summarized as follows; 1) Since diethylamine strongly catalyzes silanol condensation, the particle surface was thoroughly hydrophobized. 2) Since the hydrophobized particle had good affinity with diethylamine, the hybrid silica particles remained stably dispersed in it. Furthermore, even after the hybrid silica particles are air-dried, they are redispersed in hexane in the form of the primary-particle dispersed.
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使用与不同密度的 C_1 和 C_18 配体键合的硅胶进行反相液相色谱中的表面扩散。
DOI：
--
发表时间：
2007
期刊：
Talanta 71
影响因子：
--
作者：
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通讯作者：
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DOI：
10.1016/j.colsurfa.2016.08.041
发表时间：
2016
期刊：
Colloids and Surfaces A: Physicochemical and Engineering Aspects
影响因子：
--
作者：
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通讯作者：
K. Kurumada
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影响因子：
3.9
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
Kim, Bonghwan