Understanding the self-assembly of charged nanoparticles at the water/oil interface

被引:181
作者
Reincke, Francois
Kegel, Willem K.
Zhang, Hao
Nolte, Marc
Wang, Dayang [1 ]
Vanmaekelbergh, Daniel
Mohwald, Helmuth
机构
[1] Max Planck Colloids & Interfaces, D-14424 Potsdam, Germany
[2] Univ Utrecht, Vant Hoff Lab Phys & Colloid Chem, NL-3508 TA Utrecht, Netherlands
关键词
D O I
10.1039/b604535a
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 present a thermodynamic evaluation of the self-assembly of charged nanometer-sized particles at the water/oil interface. The chemical potentials of the nanoparticles in the bulk (aqueous) phase and at the water/oil interface are calculated taking into account interfacial energies, van der Waals interactions, and electrostatic repulsions. An isotherm of the interfacial particle density as a function of the surface charge density on the particles is obtained and compared with experimental results on gold and CdTe nanoparticles self-assembled at the water/heptane interface. Our model provides a semi-quantitative explanation for the spontaneous self-assembly of several types of metallic and semiconducting charged nanoparticles upon reduction of their surface charge.
引用
收藏
页码:3828 / 3835
页数:8
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