Oxidation of nanodiamonds and modulation of their assembly in polymer-based nanohybrids by field-inducement
Oxidation of nanodiamonds and modulation of their assembly in polymer-based nanohybrids by field-inducement
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DOI：
10.1007/s10853-013-7228-6
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发表时间：
2013-06-01
影响因子：
4.5
通讯作者：
Niihara, Koichi
中科院分区：
文献类型：
--
作者：
Cho, Hong-Baek;Son Thanh Nguyen;Niihara, Koichi
在聚合物基纳米杂化膜中进行了密集排列的氧化纳米金刚石（OxNDs）线性组装。将预聚聚酯和氧化钕的均匀悬浮液放置在聚酰胺间隔物上，并施加电场，以便在混合物交联之前诱导填料的重新定位和组装。OxNDs很容易悬浮，形成不同厚度的OxNDs线性组合（LAOxNDs），垂直于薄膜表面排列。具有线性LAOxNDs组件的纳米杂化膜在保持聚氧化物的电绝缘性能的同时，表现出了热导率的适度增加。本文从物理性质的变化出发，阐述了预聚物基体中LAOxNDs的场致制备和结构变化机理。目前的空气氧化工艺和场致应用在提高聚合物基杂化材料的物理性能方面是简单而有效的，因此在纳米复合材料的制造和调制方面具有应用潜力。
Linear assembly of densely packed oxidized nanodiamonds (OxNDs) was performed in polymer-based nanohybrid films. A homogeneous suspension of the pre-polymer polyepoxide and OxNDs was placed onto a polyamide spacer and subjected to an electric field in order to induce the relocation and assembly of the fillers before the mixture became cross-linked. The OxNDs suspended readily, forming linear assemblies of OxNDs (LAOxNDs) of varying thicknesses, aligned perpendicular to the film surfaces. Nanohybrid films with linear assemblies of LAOxNDs exhibited a moderate increase in thermal conductivity while maintaining the electrical insulation properties of the polyepoxide. Mechanisms for the field-induced fabrication and the structural variation of LAOxNDs in the pre-polymer matrix are elucidated in relation to the variations in physical properties. The present air oxidation process and field-induced application are simple but effective in enhancing the physical properties of polymer-based hybrids, and hence, has the potential for applying in the fabrication and modulation of nanocomposite materials.