Comparison of the Mechanical Properties of Self-Assembled Langmuir Monolayers of Nanoparticles and Phospholipids

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• 作者：Siheng Sean You ; Rossen Rashkov ; Pongsakorn Kanjanaboos ; Ignacio Calderon ; Mati Meron ; Heinrich M. Jaeger ; Binhua Lin
• 刊名：Langmuir
• 出版年：2013
• 出版时间：September 17, 2013
• 年：2013
• 卷：29
• 期：37
• 页码：11751-11757
• 全文大小：379K
• 年卷期：v.29,no.37(September 17, 2013)
• ISSN：1520-5827

文摘

Nanoparticles with hydrophobic capping ligands and amphiphilic phospholipids are both found to self-assemble into monolayer films when deposited on the air/water interface. By separately measuring the anisotropic stress response of these films under uniaxial compression, we obtain both the 2D compressive and shear moduli of a range of different thin nanoparticle and phospholipid films. The compressive moduli of both nanoparticle and lipid films in the solid phase are on the same order of magnitude, whereas the shear moduli of the lipid films are found to be significantly lower. Additionally, the moduli of the nanoparticle films depended substantially on the polydispersity of the constituent particles鈥攂roader size distribution lowered the stiffness of the nanoparticle film.