TY - JOUR
T1 - PH-induced release of polyanions from multilayer films
AU - Kharlampieva, Eugenia
AU - Ankner, John F.
AU - Rubinstein, Michael
AU - Sukhishvili, Svetlana A.
PY - 2008/3/27
Y1 - 2008/3/27
N2 - We discovered pH-induced selective desorption and readsorption of weakly acidic polymers from polyacid or polybase layer-by-layer films. In situ attenuated total reflection Fourier transform infrared spectroscopy confirms the selectivity of polyacid release and shows that film response is caused by pH-induced charge imbalance. Experimentally the characteristic time of chain release τ scales with molar mass M as M1.1±0.1. A new theoretical model of "sticky gel electrophoresis" of entangled polyacids agrees with experiments and predicts τ∼MH, where H is film thickness. Neutron reflectivity shows that polyacid release results in disordering of the film structure.
AB - We discovered pH-induced selective desorption and readsorption of weakly acidic polymers from polyacid or polybase layer-by-layer films. In situ attenuated total reflection Fourier transform infrared spectroscopy confirms the selectivity of polyacid release and shows that film response is caused by pH-induced charge imbalance. Experimentally the characteristic time of chain release τ scales with molar mass M as M1.1±0.1. A new theoretical model of "sticky gel electrophoresis" of entangled polyacids agrees with experiments and predicts τ∼MH, where H is film thickness. Neutron reflectivity shows that polyacid release results in disordering of the film structure.
UR - http://www.scopus.com/inward/record.url?scp=41549112044&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.100.128303
DO - 10.1103/PhysRevLett.100.128303
M3 - Article
AN - SCOPUS:41549112044
SN - 0031-9007
VL - 100
JO - Physical Review Letters
JF - Physical Review Letters
IS - 12
M1 - 128303
ER -