Failure of Debye-Hückel Screening in Low-Charge Colloidal Suspensions

Colloids and Interfaces

Shafiq, Mohamad Danial¹  Waggett, Franceska² 

[1] Author to whom correspondence should be addressed;School of Chemistry, University of Bristol, Bristol BS8 1TS, UK

关键词: electrostatics;    DLVO;    optical manipulation;   

DOI  :  10.3390/colloids2040051

学科分类：物理化学和理论化学

来源: mdpi

【 摘 要 】

Derjaguin–Landau–Verwey–Overbeek (DLVO) theory remains the cornerstone of colloid stability. Electrostatic interactions dominate van der Waals attractions at large colloid-colloid separations h, unless strongly screened. Under these conditions, the potential U ( h ) between charged colloids is expected to be exponentially screened, U ( h ) ∼ exp ( − κ h ) / h, withκ− 1 =λ Dwhere λ D is the classical Debye-Hückel screening length. By measuring the force between individual charged particles at dilute electrolyte concentrations (

【 授权许可】

CC BY