Use of Pulsed Streaming Potential with a Prepared Cationic Polyelectrolyte Layer to Detect Deposition Kinetics of Graphene Oxide and Consequences of Particle Size Differences

Lei Zhao; Lizhi Zhao; Shenghong Yang; Xianglu Peng; Jing Wu; Lei Bian; Xiayan Wang; Qiaosheng Pu

doi:10.1021/acs.analchem.6b02342

Use of Pulsed Streaming Potential with a Prepared Cationic Polyelectrolyte Layer to Detect Deposition Kinetics of Graphene Oxide and Consequences of Particle Size Differences

Anal Chem. 2016 Nov 1;88(21):10437-10444. doi: 10.1021/acs.analchem.6b02342. Epub 2016 Oct 14.

Authors

Lei Zhao¹, Lizhi Zhao¹, Shenghong Yang¹, Xianglu Peng¹, Jing Wu¹, Lei Bian¹, Xiayan Wang², Qiaosheng Pu¹

Affiliations

¹ State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University , Lanzhou, Gansu 730000, China.
² Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, Beijing University of Technology , Beijing 100124, China.

PMID: 27696821
DOI: 10.1021/acs.analchem.6b02342

Abstract

The deposition kinetics of graphene oxide (GO) onto poly(ethylene imine) (PEI) layer was characterized in situ with pulsed streaming potential (SP) measurement, and it was found that the initial rate constant (k_i) was dependent on the size of GO with same surface charge density at a fixed concentration under controlled experimental conditions. Assuming the deposition was controlled by diffusion at the initial stage, k_i is proportional to R_h^-2/3, where R_h is the hydrodynamic radius. By flushing a GO solution through a capillary coated with PEI, the initial change rate of relative SP (dE_r/dt) was obtained in 20 s and k_i was measured with five different concentrations in about 2 min. Three GO samples of different sizes obtained from the same batch of raw material were characterized with pulsed SP to get k_i values, and their sizes were verified with atomic force microscopy and dynamic light scattering. The experimental results are consistent with the predicted effects of the size of NPs on their deposition kinetics.

Publication types

Research Support, Non-U.S. Gov't