pH-induced release of polyanions from multilayer films.
pH-induced release of polyanions from multilayer films.
复制标题
pH 诱导的聚阴离子从多层膜中释放。
DOI：
--
复制
发表时间：
2008
影响因子：
8.6
通讯作者：
S. Sukhishvili
中科院分区：
文献类型：
--
作者：
E. Kharlampieva;J. Ankner;M. Rubinstein;S. Sukhishvili
我们发现了pH诱导的弱酸性聚合物从多酸或多碱层层膜的选择性解吸和再吸附。原位衰减全反射傅里叶变换红外光谱证实了多酸释放的选择性，并表明膜响应是由pH引起的电荷不平衡引起的。实验上，链释放的特征时间τ与摩尔质量M成比例，即M（1.1+/-0.1）。一个新的理论模型的“粘性凝胶电泳”的纠缠多酸同意实验和预测τ约MH，其中H是膜厚度。中子反射率表明，多酸释放的结果在膜结构的无序。
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 tau scales with molar mass M as M(1.1+/-0.1). A new theoretical model of "sticky gel electrophoresis" of entangled polyacids agrees with experiments and predicts tau approximately MH, where H is film thickness. Neutron reflectivity shows that polyacid release results in disordering of the film structure.