Effects of Membrane Defects and Polymer Hydrophobicity on Networking Kinetics of Vesicles
The kinetics of clustering unilamellar vesicles induced by inverse Pluronics [poly(propylene oxide)m–poly(ethylene oxide)n–poly(propylene oxide)m, POm–EOn–POm] was investigated via experiments and molecular dynamic simulations. Two important factors for controlling the networking kinetics are the membrane defects, presumably located at the interfacial region between two lipid domains induced by acyl chain mismatch, and the polymer hydrophobicity. As expected, the clustering rate increases significantly with increasing bilayer defects on the membrane where the insertion of PPO is likely to take place because of the reduced energy barrier for the insertion of PO. The hydrophobic interaction between the PO blocks and membranes with the defects region dictates the “anchoring” kinetics, which is controlled by the association–dissociation of PO with the lipid membrane. As a result, the dependence of clustering rate on polymer concentration is strongly influenced by the hydrophobicity of the PO blocks. Neverthel...
Yan Xia; Hyun-Sook Jang; Zhiqiang Shen; Geoffrey D. Bothun; Ying Li; Mu-Ping Nieh
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Rohm and Haas Powder Coatings is delighted to announce that its Reading, Pennsylvania, facility is the first site in the world to receive the RCMS® Site Certification awarded by the American Chemical Council (ACC).
When Raj Gupta, Chairman and CEO of Rohm and Haas Company, became Chairman ... more