本研究分別利用四碳醇、八碳醇及十六碳醇對二氧化矽粒子表面進行改質，以控制二氧化矽粒子表面的親疏水性，並探討表面經改質之二氧化矽粒子與聚二甲基矽氧烷（PDMS）在氣/液界面上所形成之混合Langmuir層的行為，以及其混合Langmuir-Blodgett（LB）膜的形態。
實驗結果顯示表面經四碳醇改質之二氧化矽粒子（C4H9-SiO2）與PDMS所形成的混合Langmuir層，其表面壓-每粒子佔據面積等溫線與二氧化矽粒子Langmuir層的等溫線相較有左移的趨勢。這可能是因為C4H9-SiO2表面的疏水性較弱，在壓縮混合Langmuir層的過程中有粒子的損失所造成的。而表面經八碳醇或十六碳醇改質之二氧化矽粒子（C8H17-SiO2或C16H33-SiO2），表面則具有較強的疏水性，當其與PDMS形成混合Langmuir層時，因PDMS的存在使得等溫線的lift-off point往右偏移。
利用LB沉積技術將氣液界面上的Langmuir層轉移至玻璃基板上，並以掃描式電子顯微鏡進行分析。結果顯示可在基板上製備出具有高表面覆蓋率的C4H9-SiO2/PDMS混合LB膜，由於其粒子間的吸引力較小，因此在混合Langmuir層中並未出現相分離的情形。對C8H17-SiO2/PDMS混合系統而言，可能因為粒子間的作用力較大，所以在壓縮混合Langmuir層的過程中出現相分離的情形，且使得PDMS被擠出粒子層，所形成之LB膜則有較多的空洞結構。C16H33-SiO2/PDMS混合LB膜的表面形態與C16H33-SiO2的類似，此時混合Langmuir層應處於相分離的狀態，且當PDMS被擠出氣液界面時，似乎就聚集在C16H33-SiO2粒子層的不均勻結構周圍。

In this study, the surface hydrophobicity of silica particles was controlled through surface modification by butanol, octanol, and hexadecanol, respectively. The Langmuir layer behavior and Langmuir-Blodgett (LB) film morphology of the mixed silica particle/poly(dimethylsiloxane) (PDMS) systems were then investigated.
Experimental results demonstrated that for the mixed Langmuir layer of PDMS and silica particles with surface modification by butanol, the surface pressure-area per particle isotherm shifted to the left in comparison with that of a silica particle Langmuir layer. This probably resulted from a loss of particles during the compression stage due to the less hydrophobic characteristic of the silica particle surface. Strong hydrophobic surface characteristic was found for silica particles with surface modification by octanol or hexadecanol. For the mixed Langmuir layer of PDMS with the more hydrophobic silica particles, the lift-off point of the isotherm shifted to the right in the presence of PDMS.
The Langmuir layers at the air/liquid interface were transferred onto glass substrates by the Langmuir-Blogett (LB) deposition technique, and the LB films were analyzed by scanning electron microscopy (SEM). It was found that a mixed C4H9-SiO2/PDMS LB film with a high surface coverage could be fabricated on a glass substrate. Since only a weak interaction was available between particles, no phase separation occurred in the mixed Langmuir layer. For the mixed C8H17-SiO2/PDMS system, strong interactions between particles might result in phase separation in the mixed layer with the PDMS expulsion during the compression stage, and a LB film with more holes was obtained. The surface morphology of a mixed C16H33-SiO2/PDMS LB film was similar to that of a C16H33-SiO2 LB film. It appeared that a phase separation occurred in the mixed Langmuir layer and PDMS molecules aggregated around the inhomogeneous structures of the C16H33-SiO2 layer when they were expelled from the air/liquid interface.

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