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化学学报
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化学学报 ›› 2012, Vol. 70 ›› Issue (07): 938-942.DOI: 10.6023/A1111144 上一篇    

研究简报

尺寸效应对氧化锌微/纳体系热力学性质的影响

范高超a, 黄在银a,b, 陈洁a, 马玉洁a   

  1. a 广西民族大学化学与生态工程学院 南宁 530006;
    b 广西壮族自治区林产化学品开发与应用重点实验室 南宁 530006
  • 投稿日期:2011-11-14 修回日期:2011-12-17 发布日期:2012-03-05
  • 通讯作者: 黄在银
  • 基金资助:

    国家自然科学基金(No. 20963001)、广西自然科学基金(Nos. 0832078, 0991085)和广西区研究生科研创新项目(No. 2011106080817M366)资助.

Impact of Size Effects on the Thermodynamic Properties of Zinc Oxide Micro/nano System

Fan Gaochaoa, Huang Zaiyina,b, Chen Jiea, Ma Yujiea   

  1. a College of Chemistry & Ecological Engineering, Guangxi University for Nationalities, Nanning 530006;
    b Key Laboratory of Forest Chemicals Development and Application of Guangxi Zhuang Autonomous Region, Nanning 530006
  • Received:2011-11-14 Revised:2011-12-17 Published:2012-03-05
  • Supported by:

    Project was supported by the National Natural Science Foundation of China (No. 20963001), Guangxi Natural Science Foundation of China (Nos. 0832078 and 0991085) and Innovation Project of Guangxi Graduate Education (No. 2011106080817M366).

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采用微乳液水热辅助法合成了三种不同尺寸的手榴弹状ZnO 微/纳结构. 通过设计热化学循环, 建立了纳米ZnO与块体ZnO体系热力学性质之间的关系. 并结合微量热技术对不同尺寸ZnO微/纳体系的热力学性质进行了计算. 结果表明, 尺寸效应对微/纳体系热力学性质有显著的影响: 随着反应物尺度的减小, 体系的标准摩尔反应焓、标准摩尔反应Gibbs 自由能、标准摩尔反应熵均降低, 而材料自身的标准摩尔生成焓、标准摩尔生成Gibbs 自由能、标准摩尔熵均增加.

关键词: 热力学性质, 微量热技术, 纳米ZnO, 尺寸效应, 微乳液法

Grenade-like ZnO micro/nano structures with three different sizes were prepared by microemulsion- mediated hydrothermal route. Through designing a thermochemical cycle, the relationship between thermodynamic properties of nano ZnO and bulk ZnO systems was built. Combined with microcalorimetry, thermodynamic properties of the ZnO micro/nano systems with different sizes were calculated. The results revealed that size effect has significant influences on thermodynamic properties of micro/nano systems. Along with the size of reactants decreasing, the standard molar enthalpy of reaction, standard molar Gibbs free energy of reaction and standard molar entropy of reaction of micro/nano systems decreased, but the standard molar enthalpy of formation, standard molar Gibbs free energy of formation and standard molar entropy of themselves increased.

Key words: thermodynamic properties, microcalorimetry, nano ZnO, size effect, microemulsion method