摘要：Nanoscale charge heterogeneity is often invoked to explain colloid attachment to grain surfaces in the presence of repulsive energy barriers, yet characterizing its direct impact on the detected spatial variation of colloid-surface interactions through spectroscopy remains unexplored. To gain deeper insights into how intrinsic charge heterogeneity impacts colloid-surface adhesion forces, we measured the spatial distribution of adhesion forces between carboxylated polystyrene latex microspheres and hydrophilic silica substrates in an aqueous solution across different NaCl concentrations (SC) using colloid-probe atomic force microscope (AFM). Trends of mean measured adhesion force with SC were compared to predictions from DLVO and extended DLVO (xDLVO) theories. The xDLVO framework successfully captured the observed trend with NaCl concentration via the impact of NaCl concentration on the repulsive hydration force. Incorporating nanoscale charge heterogeneity into colloid-surface interaction simulations reproduced the experimentally-observed variation around the mean, highlighting the prominent contribution of charge heterogeneity to observed spatial variation of adhesion forces. ? 2025 Elsevier B.V.

ISSN号：0927-7757

卷、期、页：卷722

发表日期：2025-10-05

影响因子：0.000000

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Colloids and Surfaces A: Physicochemical and Engineering Aspects

参与作者：威廉约翰逊,帕兹米诺,游振江

通讯作者：袁璐

第一作者：杨钰龙,袁伟峰

论文类型：期刊论文

论文概要：杨钰龙,袁伟峰,威廉约翰逊,帕兹米诺,袁璐,游振江，Probing spatial variation in AFM-measured adhesion: Implication of distributed nanoscale charge heterogeneity，Colloids and Surfaces A: Physicochemical and Engineering Aspects，2025，卷722

论文题目：Probing spatial variation in AFM-measured adhesion: Implication of distributed nanoscale charge heterogeneity