ミセルの構造と水性水分
Joshua A Long1, Blake M Rankin1, Dor Ben-Amotz1
1Department of Chemistry, Purdue University , West Lafayette, Indiana 47907, United States.
Journal of the American Chemical Society
|July 30, 2015
まとめ
水は表面活性物質のミセルに深く浸透し 過去のモデルに挑戦します タンパク質に似た複雑な構造を示唆している.
科学分野:
- 物理化学
- 超分子化学
- スペクトロスコーピー
背景:
- 菌糸体は,水溶液中の表面活性物質によって形成される,至るところに存在する自己組み立て構造です.
- ミセルの内部水分と表面構造を理解することは,アプリケーションにとって不可欠ですが,依然として困難です.
- 以前のモデルでは,より硬く,水分が少ない核を想定していました.
研究 の 目的:
- 異なる鎖長とヘッドグループを持つ表面活性物質ミセルの水酸化を調査する.
- 水がミケルの内部に浸透する程度を測定する.
- ミセル内の溶解した分子の微環境を特徴づける.
主な方法:
- 多変数曲線解像度の組み合わせラマン光譜法 (Raman-MCR)
- 異なるアニファティック鎖長とアニオン (カルボキシラート) またはカチオン (トリメチルアモニウム) ヘッドグループを持つ表面活性物質の探査
- 臨界ミセル濃度 (CMC) 以下のシステムとそれ以上のシステムを研究した.
主要な成果:
- ヘッドグループ近くの最初の数個の炭素を超えて,ミセルの内部に重要な水の浸透を示した.
- 溶解したデュテラート n-ヘクサンは 乾燥した油っぽい環境を示す振動の C-D 周波数シフトを示した
- 溶解したベンゼンの局所化はヘッドグループ電荷に敏感であることが判明した.
結論:
- ミケルの水性核は,水性非極性腔を持つ波紋表面に囲まれています.
- 表面活性物質の鎖の長さに伴い,これらの水分化空洞の深さは増加する.
- これらの発見は,以前考えられていたよりもミセル構造が複雑でタンパク質に似ていることを示唆しています.
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