Langmuir films of dipalmitoyl phosphatidylethanolamine grafted poly(ethylene glycol). In-situ evidence of surface aggregation at the air-water interface
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- 作者：Eduardo M. Clop ; Natalia A. Corvalá ; n ; Marí ; a A. Perillo ; mperillo@unc.edu.ar" class="auth_mail" title="E-mail the corresponding author
- 关键词：Polymer grafted lipids ; PE-PEG ; Mixing behavior ; Langmuir films ; PM-IRRAS ; BAM ; EFM ; Surface aggregation
- 刊名：Colloids and Surfaces B: Biointerfaces
- 出版年：2016
- 出版时间：1 December 2016
- 年：2016
- 卷：148
- 期：Complete
- 页码：640-649
- 全文大小：2154 K
文摘
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π-area compression isotherms showed two 2D-transitions, t1 (∼6 mN/m) and t2 (∼30 mN/m).
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Polymer chains with threshold lengths show interfacial desorption and compaction at t1.
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PE-PEG5000, steric hindrance in PEG tail avoids hydrocarbon chains condensation at t2.
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In-situ BAM/EFM revealed budding structures/2D-domains in PE-PEGn films with n ≥ 1000.
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The PEG layer behaves as a compact and thick dependent electrical insulator.