title: First-order conformation transition of single poly(2-vinylpyridine) molecules in aqueous solutions.
abstract: By measuring diffusion rate, the conformation change of single poly(2-vinylpyridine) chain in aqueous solution was studied by fluorescence correlation spectroscopy. The data showed a stepwise change of hydrodynamic radius when pH value was tuned, reflecting a sign of first-order conformation transition, and a continuous change was found at varying salt concentration.
authors.affiliation: Beijing National Laboratory of Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China.
authors.forename: Shengqin
authors.initials: S
authors.lastname: Wang
authors.forename: Jiang
authors.initials: J
authors.lastname: Zhao
mesh_terms: D006863:Hydrogen-Ion Concentration; D008968:Molecular Conformation; D011145:Polyvinyls / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry; D012996:Solutions; D014867:Water / Q000737:chemistry*
chemical_list: D011145:Polyvinyls; D012996:Solutions; D014867:Water; C058671:poly(2-vinylpyridine); D012965:Sodium Chloride