Measure of Surface Potential at the Aqueous-Oxide Nanoparticle Interface by XPS from a Liquid Microjet

被引：65

作者：

Brown, Matthew. A. ^{[1
,2
]}

Redondo, Amaia Beloqui ^{[1
]}

Sterrer, Martin ^{[3
]}

Winter, Bernd ^{[4
,5
]}

Pacchioni, Gianfranco ^{[6
]}

Abbas, Zareen ^{[7
]}

van Bokhoven, Jeroen A. ^{[1
,2
]}

机构：

[1] ETH, Inst Chem & Bioengn, CH-8093 Zurich, Switzerland

[2] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[3] MPG, Fritz Haber Inst, Dept Chem Phys, D-14195 Berlin, Germany

[4] Helmholtz Zentrum Berlin Mat & Energie, D-12489 Berlin, Germany

[5] BESSY, D-12489 Berlin, Germany

[6] Univ Milano Bicocca, Dipartimento Sci Mat, I-20125 Milan, Italy

[7] Univ Gothenburg, Dept Chem & Mol Biol, SE-41296 Gothenburg, Sweden

来源：

NANO LETTERS | 2013年 / 13卷 / 11期

基金：

欧洲研究理事会;

关键词：

Colloid; amorphous silica; solid-liquid interface; surface chemistry; pH; binding energy shift; WATER INTERFACE; CHARGE DENSITY; IN-SITU; QUARTZ; PHOTOEMISSION; PARTICLES; MOLECULES; LEVEL; MODEL;

D O I：

10.1021/nl402957y

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We show that the surface potential at a water oxide nanoparticle (NP) interface, long considered an immeasurable direct quantity, can be measured by X-ray photoelectron spectroscopy (XPS) from a liquid microjet. This new method does not require a priori knowledge of the particles' surface structure or of the ion distribution throughout the electrical double layer for its interpretation and can be applied to any colloidal suspension independent of composition, particle size and shape, and solvent. We demonstrate the application for aqueous suspensions of 9 nm colloidal silica (SiO2) at pH 0.3 and 10.0, where the surface potential changes from positive to negative. The experimental results are compared with calculated surface potentials based on Guoy-Chapman theory and are shown to be in good agreement.

引用

页码：5403 / 5407

页数：5

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