Multi-region to single region shear thinning transitions in drying PEDOT:PSS dispersions: contributions from charge density fluctuations

被引:16
作者
Ashok, Piramuthu Raja R. [1 ]
Thomas, Mathew Shaji [1 ]
Varughese, Susy [1 ]
机构
[1] Indian Inst Technol, Dept Chem Engn, Madras 600036, Tamil Nadu, India
关键词
PEDOT/PSS FILMS; HARD-SPHERES; CONDUCTIVITY; MORPHOLOGY; DEPENDENCE; SOLVENTS; RHEOLOGY; SALT;
D O I
10.1039/c5sm01000d
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The multiple shear thinning behaviour observed in dispersions of the conducting polymer, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS), in water during the drying process is explored. PEDOT:PSS dispersions in water can be non-stoichiometric polyelectrolyte complexes (PECs) with free polyanion (PSS) chains resulting in scrambled egg conformations. They also behave as charged colloidal particles. The behaviour of PEDOT: PSS dispersions as PECs and charged colloidal systems during drying is analyzed using rheology and TEM, zeta potential, conductivity, pH, dynamic light scattering (DLS) and rheo-small angle light scattering (rheo-SALS) information. The rheological behaviour is found to have significant contributions from conformational changes in the PEDOT:PSS PEC due to charge density fluctuations affecting the electrostatic persistence length, l(e). A low concentration regime with multiple shear thinning behaviour and a high concentration regime with single shear thinning behaviour were observed. The PEC behavior of PEDOT:PSS is further explored by charge neutralizing the dispersions with salts.
引用
收藏
页码:8441 / 8451
页数:11
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