Facile preparation of a polysiloxane-based hybrid composite with highly-oriented boron nitride nanosheets and an unmodified surface
Facile preparation of a polysiloxane-based hybrid composite with highly-oriented boron nitride nanosheets and an unmodified surface
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DOI：
10.1016/j.compscitech.2010.05.012
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发表时间：
2010-10-31
影响因子：
9.1
通讯作者：
Niihara, Koichi
中科院分区：
文献类型：
--
作者：
Cho, Hong-Baek;Nakayama, Tadachika;Niihara, Koichi
提出了一种利用纳米脉冲宽度电场制备含氮化硼纳米片的聚硅氧烷基杂化复合薄膜的简便方法。BN纳米片在电场作用下呈现各向异性取向，尽管具有较宽的带隙，但不需要在表面涂覆金属纳米颗粒。BN在预聚聚硅氧烷混合物中超声分散。在通过聚合固化混合物之前，将均匀悬浮液浇铸在玻璃垫片上，并施加直流电场或纳米脉冲宽度的电场。x射线衍射（XRD）和扫描电子显微镜（SEM）结果表明，聚硅氧烷基体中的BN纳米片沿电场方向排列具有较高的各向异性，且垂直于膜面。通过紫外可见光谱法测量薄膜样品的透光率，结果表明，纳米脉冲宽度电场制备的复合材料比未使用电场制备的复合材料透光率明显提高。(c) 2010 Elsevier Ltd.版权所有。
A facile technique was developed to fabricate polysiloxane-based hybrid composite films containing boron nitride (BN) nanosheets using a nanopulse-width electric field. BN nanosheets assumed anisotrophic alignment under the electric field, without requiring surface coating with metallic nano particles despite the wide band gap. BN was dispersed by sonication in a pre-polymer polysiloxane mixture. The homogeneous suspension was cast on a glass spacer and subjected to either a DC electric field or a nanopulse-width electric field before the mixture was cured through polymerization. X-ray diffraction (XRD) and scanning electron microscopy (SEM) revealed that BN nanosheets in the polysiloxane matrix were aligned with high anisotropy to the electric field direction, which was perpendicular to the film plane. The transmittance of the film samples, measured by UV-visible spectrometry, indicated that the composite, prepared using a nanopulse-width electric field manifested a significantly improved transmittance, compared with composites prepared without using the electric field. (c) 2010 Elsevier Ltd. All rights reserved.