Thermodynamic functions of the ZnO nanoweeds

被引：14

作者：

Fan, Gaochao ^{[1
]}

Jiang, Junying ^{[1
]}

Li, Yanfen ^{[1
]}

Huang, Zaiyin ^{[1
,2
]}

机构：

[1] Guangxi Univ Nationalities, Coll Chem & Ecol Engn, Nanning 530006, Peoples R China

[2] Key Lab Forest Chem Dev & Applicat Guangxi Zhuang, Nanning 530006, Peoples R China

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2011年 / 130卷 / 03期

关键词：

Nanostructures; Thermodynamic properties; Chemical synthesis; Surfaces; NANOTHERMODYNAMICS; NANOWIRE; ARRAYS; NANOPARTICLES; EMISSION; EXCESS;

D O I：

10.1016/j.matchemphys.2011.08.066

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

ZnO nanoweeds were prepared by a simple microemulsion-mediated hydrothermal route. SEM observation revealed that each weed consisted of several nanowires which were about 1 mu m in length and 40 nm in diameter. In order to associate thermodynamic functions of nano ZnO with bulk ZnO, a novel thermochemical cycle was designed. Combined with in situ microcalorimetry, the standard molar enthalpy of formation, standard molar Gibbs free energy of formation and standard molar entropy of the obtained products at 298.15K were successfully acquired as (-319.10 +/- 0.42) kJ mol(-1), (-318.53 +/- 0.03) kJ mol(-1) and (54.85 +/- 1.02) J mol(-1) K(-1), respectively. It can be concluded that the striking differences between thermodynamic functions of nano ZnO and bulk ZnO can be rooted to surface effect of nano material. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：839 / 842

页数：4

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