Swelling in water of a layered alkali silicate, octosilicate, modified with a sulfonic acid group

Yusuke Ide, Go Ozaki, Makoto Ogawa*

*この研究の対応する著者

研究成果: Article査読

32 被引用数 (Scopus)

抄録

A layered alkali silicate, octosilicate (Na2Si8O 17 ·nH2O), was functionalized with sulfonic acid to impart swelling ability in water. To immobilize the sulfonic acid group on octosilicate, (3-mercaptopropyl)trimethox- ysilane was attached in the interlayer space and subsequently oxidized. Surface coverage with the sulfonic acid group (0.7, 1.3, and 1.7 groups per Si8O17) was controlled by changing the added amount of the silane coupling reagent (0.7,1.3, and 2.0 groups per Si8O17). The sulfonated octosilicates hydrated to expand the interlayer space, where the degree of expansion varied with the surface coverage of sulfonic acid. For the sulfonated octosilicate with the lowest surface coverage (0.7 group per Si8O17), the remaining interlayer silanol group was efficiently grafted with the trimethylsilyl group to expand the interlayer space further upon hydration. The effect of the electrolyte concentration on the hydration of the sulfonated octosilicates was investigated to find that with the increase in NaCl concentration the basal spacing decreased. The sulfonated and trimethylsilylated octosilicates were dispersed in water to form colloidal suspensions with varied transparency.

本文言語English
ページ(範囲)5276-5281
ページ数6
ジャーナルLangmuir
25
9
DOI
出版ステータスPublished - 2009 5月 5

ASJC Scopus subject areas

  • 電気化学
  • 凝縮系物理学
  • 表面および界面
  • 材料科学(全般)
  • 分光学

フィンガープリント

「Swelling in water of a layered alkali silicate, octosilicate, modified with a sulfonic acid group」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル