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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Surface Modification of Silicon Carbide Nanoparticles by Azo Radical Initiators
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Surface Modification of Silicon Carbide Nanoparticles by Azo Radical Initiators

机译：偶氮自由基引发剂对碳化硅纳米粒子的表面改性

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摘要

The surface of silicon carbide (SiC) nanoparticles was modified with three types of azo radical initiators: 2,2'-azobisisobutyronitrile (AIBN), 2,2'-azobis(2-methylpropionamidine)dihydrochloride (AMPA), and 2,2'-azobis[N-(2-carboxyethyl)-2-methylpropionamidine)n-hydrate (ACMPA). The radical species generated from the azo initiators successfully reacted with the unsaturated hydrocarbons on the surface of SiC nanoparticles. Consequently, the hydrophobic SiC surface became hydrophilic, and the dispersion stability of SiC nanoparticles in aqueous solution improved significantly. Further, it was found that the stability of SiC nanoparticles in aqueous solution under various pH values could be controlled by the structure of the azo radical initiators. When SiC nanoparticles reacted with AIBN and were further hydrolyzed by NaOH aqueous solution, since carboxyl groups were introduced on their surface, their stability improved at pH ≥5. Contrarily, when SiC nanoparticles were modified with AMP A, amine groups were formed on the SiC surface so that SiC nanoparticles were stabilized at pH ≤3. When SiC nanoparticles were modified by ACMPA, which consists of both amine groups and carboxyl groups, the modified SiC nanoparticles possessed amphoteric properties; the SiC nanoparticles were stabilized at pH 3 and 11. It was deduced that modifying SiC nanoparticles with azo radical initiators is a significant method for tuning the surface properties of SiC nanoparticles.
机译：用三种类型的偶氮自由基引发剂改性了碳化硅（SiC）纳米颗粒的表面：2,2'-偶氮二异丁腈（AIBN），2,2'-偶氮二（2-甲基丙ion）二盐酸盐（AMPA）和2,2' -偶氮双[N-（2-羧乙基）-2-甲基丙ion）n-水合物（ACMPA）。由偶氮引发剂产生的自由基物种成功地与SiC纳米颗粒表面上的不饱和烃反应。因此，疏水性SiC表面变为亲水性，并且SiC纳米颗粒在水溶液中的分散稳定性显着提高。此外，发现可以通过偶氮自由基引发剂的结构控制SiC纳米颗粒在各种pH值下在水溶液中的稳定性。当SiC纳米颗粒与AIBN反应并被NaOH水溶液进一步水解时，由于羧基被引入其表面，因此在pH≥5时其稳定性得到改善。相反，当用AMP A改性SiC纳米颗粒时，在SiC表面形成了胺基，使SiC纳米颗粒在pH≤3时稳定。当由胺基和羧基组成的ACMPA改性SiC纳米颗粒时，改性的SiC纳米颗粒具有两性。结果表明，SiC纳米颗粒的pH值稳定在3和11。用偶氮自由基引发剂改性SiC纳米颗粒是调节SiC纳米颗粒表面性能的重要方法。

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