Hydrophobic and hydrophilic behavior of micelle-templated mesoporous silica

被引：108

作者：

Cauvel, A

Brunel, D

DiRenzo, F

Garrone, E

Fubini, B

机构：

[1] ENSCM,UMR 5618 CNRS,LAB MAT CATALYT & CATALYSE CHIM ORGAN,F-34296 MONTPELLIER 5,FRANCE

[2] UNIV TURIN,DIPARTIMENTO CHIM INORGAN CHIM FIS & CHIM MAT,I-10125 TURIN,ITALY

来源：

LANGMUIR | 1997年 / 13卷 / 10期

关键词：

D O I：

10.1021/la962059i

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Adsorption of water on M41s systems has been studied by means of microcalorimetry and IR spectroscopy. After thermal treatment at only 423 K, the samples show two types of surface patches, one hydrophobic (characterized by isolated silanols not interacting with water) and the other highly hydrophilic (showing the highest heat of reversible adsorption observed so far for the H2O/SiO2 system). Thermal treatment at 1023 K causes an extensive dehydration, partially recovered by dissociative adsorption. Both the propensity for silanol condensation (and the opposite reaction of hydrolysis of siloxane bridges) and the very high heat of reversible adsorption are related to the structural properties of M41s.

引用

页码：2773 / 2778

页数：6

共 25 条

[1] MESOPOROUS ALUMINOSILICATE MCM-41 AS A CONVENIENT ACID CATALYST FOR FRIEDEL-CRAFTS ALKYLATION OF A BULKY AROMATIC COMPOUND WITH CINNAMYL ALCOHOL [J].