Ion Specific Surface Charge Density of SBA-15 Mesoporous Silica

被引：79
|
作者：
Salis, Andrea [1 ,2 ]
Parsons, Drew F. [3 ]
Bostrom, Mathias [1 ,2 ,4 ]
Medda, Luca [1 ,2 ]
Barse, Brajesh [1 ,2 ,5 ]
Ninham, Barry W. [3 ]
Monduzzi, Maura [1 ,2 ]
机构：
[1] Univ Cagliari, Dept Chem Sci, CNBS, I-09042 Monserrato, Italy
[2] CSGI, I-09042 Monserrato, Italy
[3] Australian Natl Univ, Res Sch Phys Sci & Engn, Canberra, ACT 0200, Australia
[4] Linkoping Univ, Dept Phys Chem & Biol, Div Theory & Modeling, SE-58183 Linkoping, Sweden
[5] NIPER, Dept Pharmaceut Technol Biotechnol, Sas Nagar 160062, Punjab, India
来源：
LANGMUIR | 2010年 / 26卷 / 04期
基金：
瑞典研究理事会;
关键词：
ENZYMATIC-ACTIVITY; BASIS-SETS; HOFMEISTER; LIPASE; ADSORPTION; HYDRATION; BINDING; WATER; PH;
D O I：
10.1021/la902721a
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Potentiometric titrations were used to estimate the surface charge density of SBA-15 mesoporous silica in different salt solutions. It was found that Surface charge depends both on cation type, following a Hofmeister series (Cs+ < Guanidinium(+) < K+ < Na+ < Li+), and on salt concentration (in the range 0.05-1 M). The Surface charge series is reproduced by theoretical calculations performed using a modified Poisson-Boltzmann equation that includes ionic dispersion forces with ab initio ion polarizabilities and hydrated ions. The hydration model assigns an explicit hydration shell to kosmotropic (strong hydrated) ions only. The Hofmeister series appears to be due to the combination of ion-surface dispersion interactions and ion hydration.
引用
收藏
页码：2484 / 2490
页数：7
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