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Effect of inorganic-organic composite coating on the dispersion of silicon carbide nanoparticles in non-aqueous medium

机译：无机-有机复合涂层对碳化硅纳米粒子在非水介质中分散的影响

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摘要

In order to disperse silicon carbide (SiC) nanoparticles homogeneously in a non-aqueous medium, the surface of SiC nanoparticles needs to be modified via surface organic functionalization. A method of SiC nanoparticle surface modification by grafting of polyacetals via inorganic-organic composite coating was developed. The resulting graft percentage of up to 10.5 percent was much higher than that of direct grafting. The inorganic-organic composite coating on a SiC nanoparticle surface led to an almost complete decomposition of the secondary structure of the agglomerates and the formation of the primary structure. Dispersibility of the modified version was studied by using a transmission electron microscope (TEM) and size distribution analyser. The sedimentation experiments showed that the coated SiC nanoparticles exhibited good suspension stability in butanone. The composition of the inorganic-organic composite coating on the SiC nanoparticles was investigated by energy dispersive x-ray analyses (EDX), hydrogen nuclear magnetic resonance ( H NMR) and Fourier-transformed infrared spectroscopy (FT-IR). This work provides a novel concept of surface grafting modification for non-oxide nanoparticles to improve their dispersibility in non-aqueous medium.
机译：为了将碳化硅（SiC）纳米颗粒均匀地分散在非水介质中，需要通过表面有机功能化对SiC纳米颗粒的表面进行改性。提出了一种通过无机-有机复合涂层接枝聚缩醛对SiC纳米粒子进行表面改性的方法。所得的接枝率高达10.5％，远高于直接接枝率。 SiC纳米颗粒表面上的无机-有机复合涂层导致附聚物的二级结构几乎完全分解并形成一级结构。通过使用透射电子显微镜（TEM）和尺寸分布分析仪研究了改进版的分散性。沉降实验表明，包覆的SiC纳米颗粒在丁酮中具有良好的悬浮稳定性。通过能量色散X射线分析（EDX），氢核磁共振（H NMR）和傅立叶变换红外光谱（FT-IR）研究了SiC纳米颗粒上无机-有机复合涂层的组成。这项工作为非氧化物纳米粒子提供了一种表面接枝改性的新概念，以改善其在非水介质中的分散性。

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