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Kinetics of Polymer Desorption from Colloids Probed by Aggregation-Induced Emission Fluorophore

Author:
Yan, Feng, Zhu, Zhichao, Dong, Xiaobiao, Wang, Chao, Meng, Xiaohui, Xie, Yue, Zhang, Guanxin, Qiu, Dong
Source:
Langmuir 2018 v.34 no.24 pp. 7006-7010
ISSN:
1520-5827
Subject:
adsorption, colloids, desorption, fluorescent dyes, models, molecular weight, polyethylene glycol, silica
Abstract:
Polymer adsorption and desorption are fundamental in many industrial and biomedical applications. Here, we introduce a new method to monitor the polymer desorption kinetics in situ based on the behavior of aggregation-induced emission. Poly(ethylene oxide) and colloidal silica (SiO₂) were used as a model system. It was found that the aggregation-induced emission method could be successfully used to determine the polymer desorption kinetics, and the polymer desorption followed the first-order kinetics. It was also found that the polymer desorption rate constant decreased with the increasing molecular weight, which could be described by a power law function kd ≈ M–⁰.²⁸, close to that of the adsorption rate constant.
Agid:
6071624