Influence of co-solvent hydroxyl group number on properties of water-based conductive carbon pastes--颗粒学报PARTICUOLOGY

Hua, C., Li, X., Shen, L., Lei, H., Guo, X., Liu, Z., . . . Chen, C.-M. (2017). Influence of co-solvent hydroxyl group number on properties of water-based conductive carbon pastes. Particuology, 33, 35-41. https://doi.org/10.1016/j.partic.2016.10.005

Influence of co-solvent hydroxyl group number on properties of water-based conductive carbon pastes

Chengjie Hua ^{a b}, Xiaoming Li ^b, Lijuan Shen ^a, Hong Lei ^b, Xiaoqian Guo^b, Zhuo Liu ^b, Qingqiang Kong ^b, Lijing Xie ^b, Cheng-Meng Chen ^b *

a School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
b CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

10.1016/j.partic.2016.10.005

Volume 33, August 2017, Pages 35-41

Received 19 August 2016, Revised 8 October 2016, Accepted 15 October 2016, Available online 18 March 2017, Version of Record 13 June 2017.

E-mail: ccm@sxicc.ac.cn

Highlights

• Rheological behaviors of water-based conductive pastes were adjusted by using alcohol co-solvents.

• Paste’s viscosity was increased with the number of hydroxyl groups for the co-solvent.

• Co-solvent with two hydroxyl groups was the best in inducing Marangoni flow.

• The balance between convective and Marangoni flow should be kept during drying.

• Interconnected carbon black particles provided high conductivity for printed pattern.

Abstract

A series of water-based conductive carbon pastes were prepared by wet ball milling, followed by vacuum defoaming using isopropyl alcohol, propylene glycol or glycerin as co-solvents. Screen printing was then used to prepare conductive patterns. To determine the influence of co-solvent hydroxyl group number on the properties of water-based conductive carbon pastes, the rheological properties of the pastes and the surface morphologies and conductivities of the printed patterns were characterized. The results show that paste viscosity increased with the number of hydroxyl groups and the latter also affected thixotropy. In addition, the boiling points and surface tensions of the co-solvents increased consistently with hydroxyl group number, affecting the hydrodynamic flow. The conductive carbon paste created using propylene glycol as a co-solvent was the best for screen printing because of its weak coffee-ring effect and appropriate rheological properties, resulting in a smooth coating surface and uniform deposition of the fillers. The resistivity of the pattern printed using paste PG, containing the closest packing of conductive carbon black particles, was 0.44 Ω cm.

Graphical abstract

Keywords

Water-based conductive carbon paste; Alcohol co-solvent; Screen printing; Rheological property; Marangoni flow

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