摘要
The chemical grafting of thiol terminated poly（sodium styrenesulfonate） （HS-PSSS） chains from sodium nitrate （NaNO3） salt solution to a gold surface was investigated with a quartz crystal microbalance with dissipation monitoring （QCM-D） in different salt concentrations, It was found that at low salt concentration grafting density of HS-PSSS was low and the grafted chains adopted a mushroom conformation. With the increase of salt concentration polyelectrolyte chains underwent a transition toward coiled state due to reduction of electrostatic repulsion and as a result more chains were grafted on the surface, When the grafting density reached a certain limit after which further grafting caused repulsion between already grafted HS-PSSS chains and as a result grafted chains adopted a brush conformation.
The chemical grafting of thiol terminated poly（sodium styrenesulfonate） （HS-PSSS） chains from sodium nitrate （NaNO3） salt solution to a gold surface was investigated with a quartz crystal microbalance with dissipation monitoring （QCM-D） in different salt concentrations, It was found that at low salt concentration grafting density of HS-PSSS was low and the grafted chains adopted a mushroom conformation. With the increase of salt concentration polyelectrolyte chains underwent a transition toward coiled state due to reduction of electrostatic repulsion and as a result more chains were grafted on the surface, When the grafting density reached a certain limit after which further grafting caused repulsion between already grafted HS-PSSS chains and as a result grafted chains adopted a brush conformation.
基金
financially supported by the Higher Education Commission(HEC) of Pakistan under the indigenous PhD scholarship program
