Molecular orientation and multilayer formation in the adsorbed film of 1H,1H,10H,10H-perfluorodecane-1,10-diol at the hexane/water interface; temperature effect on the adsorption of fluoroalkane-diol
Molecular orientation and multilayer formation in the adsorbed film of 1H,1H,10H,10H-perfluorodecane-1,10-diol at the hexane/water interface; temperature effect on the adsorption of fluoroalkane-diol
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1H,1H,10H,10H-全氟癸烷-1,10-二醇在己烷/水界面吸附膜的分子取向和多层形成；
DOI：
10.1021/jp077456o
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发表时间：
2008
影响因子：
3.7
通讯作者：
M. Aratono
中科院分区：
文献类型：
--
作者：
T. Takiue;T. Fukuda;D. Murakami;Hideaki Inomata;Hiroyasu Sakamoto;H. Matsubara;M. Aratono
通过测定界面张力的温度依赖性和热力学数据分析，研究了1H，1H，10 H，10 H-全氟癸烷-1，10-二醇（FC-10 diol）在正己烷/水界面上的吸附，以了解疏水链两端的两个羟基和疏水链的刚性对氟碳醇在界面上吸附的影响。界面张力随温度和浓度的变化曲线显示出对应于吸附FC 10二元醇膜中相变的折点。界面压力-平均吸附分子面积曲线显示了由两个不连续变化连接的三种状态。第一相变后的面积值非常接近FC 10二醇分子沿其主轴沿着的计算横截面积，因此FC 10二醇分子形成分子取向平行于界面的凝聚单层。另一个值得注意的点是，在第二相变点之后的值进一步减小到0.12 nm 2，这比氟碳链的横截面积0.28 nm 2小得多，随着界面压力的增加。这表明FC 10二醇分子自发地堆积并在第二相变上方连续地形成多层。此外，偏摩尔熵和能量变化的吸附在膨胀和凝聚态进行了评估和比较的1H，1H，2 H，-2 H-全氟癸醇（TFC 10 OH），它几乎垂直于界面的方向。除了本体溶液中两个羟基与正己烷的接触外，还用界面处的偏摩尔熵和能量对FC 10二醇在界面处的平行取向引起的下列因素的依赖性解释了结果;（a）两个羟基与水分子的氢键，（B）两个彼此面对的羟基之间的氢键，和（c）碳氟化合物链-水接触。吸附的FC 10二醇膜由因素a和B稳定，其压倒了由因素c引起的能量缺点。此外，还将多层膜中吸附As的熵变与假设凝聚单层膜堆积形成多层膜时计算的Δs cal进行了比较。有人认为，与第一个凝聚单层相比，FC 10二醇分子在多层膜中的堆积并不那么致密，因此多层膜并不是简单地由凝聚单层的堆积形成的。
The adsorption of lH,lH,10H,10H-perfluorodecane-1,10-diol (FC 10 diol) at the hexane/water interface was investigated by the measurement of temperature dependence of interfacial tension and the thermodynamic data analysis in order to know the effect of two hydroxyl groups at both ends of the hydrophobic chain and the rigidity of the hydrophobic chain on the adsorption of fluorocarbon alcohol at the interface. The curves of interfacial tension versus temperature and concentration show break points corresponding to the phase transitions in the adsorbed FC 10 diol film. The interfacial pressure versus mean area per adsorbed molecule curve shows three kinds of states connected by two discontinuous changes. The area value after the first phase transition is very close to the calculated cross-sectional area of the FC 10 diol molecule along its major axis, and thus the FC 10 diol molecules form a condensed monolayer with molecular orientation parallel to the interface. Another noticeable point is that the value after the second phase transition point decreases furthermore to 0.12 nm 2 , which is much smaller than the cross-sectional area of the fluorocarbon chain, 0.28 nm 2 , with increasing interfacial pressure. This suggests that FC 10 diol molecules pile spontaneously and successively form a multilayer above the second phase transition. Furthermore, the partial molar entropy and energy change of adsorption in the expanded and condensed states were evaluated and compared to those of 1H,1H,2H,-2H-perfluorodecanol (TFC 10 OH), which orients almost perpendicular to the interface. In addition to the contact of two hydroxyl groups with hexane in the bulk solution, the results are explained by the dependence of partial molar entropy and energy at the interface on the following factors resulting from the parallel orientation of FC 10 diol at the interface; (a) hydrogen bonding of two hydroxyl groups with water molecules, (b) hydrogen bonding between two hydroxyl groups facing each other, and (c) the fluorocarbon chain-water contact. The adsorbed FC 10 diol film is stabilized by factors a and b, which overwhelm the energetic disadvantage caused by factor c. Furthermore, the entropy change of adsorption As in the multilayer is compared to the Δs cal calculated on the assumption that the condensed monolayer piles to form the multilayer. It was suggested that FC 10 diol molecules are not so densely packed in the multilayer compared to the first condensed monolayer and therefore the multilayer is not simply formed by the piling of condensed monolayers.
水油界面表面活性剂排序和界面相的 X 射线研究
DOI：
--
发表时间：
2006
期刊：
Journal of Dispersion Science and Technology 27
影响因子：
--
作者：
S.V.Pingali;T.Takiue et al.
通讯作者：
T.Takiue et al.
w-氢化对氟壬醇在己烷/水界面吸附的影响：温度对氟壬醇吸附的影响。
DOI：
--
发表时间：
2005
期刊：
J.Phys.Chem.B 109
影响因子：
--
作者：
T.Takiue;D.Murakami;T.Tamura;H.Sakamoto;H.Matsubara;M.Aratono
通讯作者：
M.Aratono
油/水界面吉布斯膜中域的形成
DOI：
--
发表时间：
2011
期刊：
影响因子：
--
作者：
坂川慎之助;高崎裕加;A.Sabarudin;梅村知也;中野雅由;T. Takiue
通讯作者：
T. Takiue