Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Analytical chemistry (Washington), 2016-11, Vol.88 (21), p.10437-10444

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.