Tuning the Interaction of Nanoparticles from Repulsive to Attractive by Pressure

被引：19

作者：

Schroer, Martin A. ^{[1
,2
,6
]}

Schulz, Florian ^{[2
,3
]}

Lehmkuehler, Felix ^{[1
,2
]}

Moeller, Johannes ^{[4
]}

Smith, Andrew J. ^{[5
]}

Lange, Holger ^{[2
,3
]}

Vossmeyer, Tobias ^{[3
]}

Gruebel, Gerhard ^{[1
,2
]}

机构：

[1] Deutsches Elektronen Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany

[2] Hamburg Ctr Ultrafast Imaging CUI, Luruper Chaussee 149, D-22761 Hamburg, Germany

[3] Univ Hamburg, Inst Phys Chem, Grindelallee 117, D-20146 Hamburg, Germany

[4] ESRF, CS 40220, F-38043 Grenoble 9, France

[5] Diamond Light Source Ltd, Diamond House,Sci & Innovat Campus, Didcot, Oxon, England

[6] DESY, European Mol Biol Lab EMBL Hamburg, Notkestr 85, D-22607 Hamburg, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2016年 / 120卷 / 35期

关键词：

2ND VIRIAL-COEFFICIENT; GOLD NANOPARTICLES; COLLOIDAL DISPERSIONS; PARTICLES; SUSPENSIONS; STABILITY; ADHESION; MODEL;

D O I：

10.1021/acs.jpcc.6b06847

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report a high pressure small-angle X-ray scattering (SAXS) study on concentrated aqueous suspensions of gold nanoparticles coated with a poly(ethylene glycol) (PEG)-based ligand shell. Analyzing the experimental SAXS data with a liquid-state theory approach, we find a pressure induced transition of the interparticle interactions from repulsive to attractive in the pressure range from 1 to 4000 bar that also depends on the particle concentration: This transition is related to structural changes of the ligand shell which is compressed with increasing pressure. Our study highlights the important, yet unexplored role of pressure for the interaction of nanoparticle systems.

引用

页码：19856 / 19861

页数：6

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