Gaussian curvature modulus of an amphiphilic monolayer
Gaussian curvature modulus of an amphiphilic monolayer
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两亲单层的高斯曲率模量
DOI：
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
J. Seddon
中科院分区：
文献类型：
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作者：
R. Templer;B. J. Khoo;J. Seddon
本文用曲率偏离优选值的偏差重新表示了两亲单层弯曲的Helfrich解析。利用该表达式和两亲体对界面弯曲响应的简单模型，证明了高斯曲率模量与平均曲率模量之比（κ G /κ）的值有严格的限制。我们通过测量由1-单油、二油基磷脂酰胆碱和二油基磷脂酰乙醇胺组成的体系中逆双连续立方中间相在水中的膨胀行为来估计κ G /κ。估计值为-0.75±0.08，与我们的模型设定的-1 < κ G /κ < 0的限值一致。这是第一个在逆双连续立方相上做出的决定，该相足够膨胀，处于一阶曲率弹性能量学应该足以描述中间相的状态，从而提供可靠的κ G /κ估计。
In this paper the Helfrich ansatz for bending an amphiphilic monolayer is re-expressed in terms of the deviations in curvature away from a preferred value. Using this expression and a simple model of the response of amphiphiles to interfacial bending, it is demonstrated that there are strict limits to the value of the ratio of the Gaussian curvature modulus to the mean curvature modulus (κ G /κ). We have made an estimate of κ G /κ from measurements of the swelling behavior in water of inverse bicontinuous cubic mesophases in a system composed of 1-monoolein, dioleoylphosphatidylcholine, and dioleoylphosphatidylethanolamine. The estimate, -0.75 ± 0.08, is in agreement with the limits set by our model of -1 < κ G /κ < 0. This determination is the first to be made on an inverse bicontinuous cubic phase which is sufficiently swollen to be in a regime where first-order curvature elastic energetics should be sufficient to describe the state of the mesophase and hence provide a reliable estimate of κ G /κ.
影响因子：
3.4
作者：
CHUNG, H;CAFFREY, M
通讯作者：
CAFFREY, M