Temperature and Morphology Effect on Surface Thermodynamic Functions of Ag3PO4 Microcrystals†

doi:10.7503/cjcu20150011

Chem. J. Chinese Universities ›› 2015, Vol. 36 ›› Issue (7): 1385.doi: 10.7503/cjcu20150011

• Physical Chemistry • Previous Articles Next Articles

Temperature and Morphology Effect on Surface Thermodynamic Functions of Ag₃PO₄ Microcrystals^†

LIU Zuojiao¹, FAN Gaochao¹, HE Liangming², DIAO Kaisheng¹, HUANG Zaiyin^1,^3,^4,^*(), TAN Xuecai^1,^3,⁴

1. College of Chemistry and Chemical Engineering,Nanning 530008, China 2. Faculty of Science,3. Key Laboratory of Forest Chemistry and Engineering,4. Guangxi Colleges and Universities Key Laboratory of Food Safety and Pharmaceutical Analytical Chemistry,Guangxi University for Nationalities, Nanning 530008, China
2. Faculty of Science,Nanning 530008, China3. Key Laboratory of Forest Chemistry and Engineering,4. Guangxi Colleges and Universities Key Laboratory of Food Safety and Pharmaceutical Analytical Chemistry,Guangxi University for Nationalities, Nanning 530008, China
3. Key Laboratory of Forest Chemistry and Engineering, Nanning 530008, China
4. Guangxi Colleges and Universities Key Laboratory of Food Safety and Pharmaceutical Analytical Chemistry,Guangxi University for Nationalities, Nanning 530008, China

Received:2015-01-07 Online:2015-07-10 Published:2015-06-17
Contact: HUANG Zaiyin E-mail:hzy210@163.com
Supported by:
† Supported by the Nationcal Natural Science Foundation of China(Nos.20963001, 21273050), the Graduate Education Innovation Program of Guangxi, China(No;YCSW2012065) and the High-level Innovation Team and Outstanding Scholar Project of Guangxi Higher Education Institutes, China

Abstract

Abstract:

Different morphologies of Ag₃PO₄ microcrystals, such as dodecahedrons, cubes, and tetrapods, were synthesized by ion-exchange method at room temperature. Based on the essential difference between thermodynamic properties of nano and bulk Ag₃PO₄, the equations for acquiring molar surface thermodynamic functions of nano Ag₃PO₄ were derived via combining the basic theory of chemical thermodynamics with thermokinetic principle. According to the derived equations, molar surface thermodynamic properties such as molar surface Gibbs free energy, molar surface enthalpy and molar surface entropy of the prepared Ag₃PO₄ microcrystals were gained by in-situ microcalorimetry. Moreover, the temperature and morphology effect on these obtained surface thermodynamic functions were discussed. The results revealed that the surface thermodynamic functions of tetrapod Ag₃PO₄ were maximum, followed by cube and dodecahedron Ag₃PO₄. Along with the increase of the temperature, molar surface enthalpy and molar surface entropy increased, whereas molar surface Gibbs free energy decreased.

Key words: Ag3PO4, Morphology effect, Microcalorimetry, Surface thermodynamics

CLC Number:

TrendMD:

LIU Zuojiao, FAN Gaochao, HE Liangming, DIAO Kaisheng, HUANG Zaiyin, TAN Xuecai. Temperature and Morphology Effect on Surface Thermodynamic Functions of Ag₃PO₄ Microcrystals^†[J]. Chem. J. Chinese Universities, 2015, 36(7): 1385.

Figures/Tables 3

Fig.1 SEM images of the prepared Ag3PO4 with morphologies of tetrapods(A), cubes(B) and dodecahedrons(C), respectively

Table 1 Logarithmic values of rate constants for Ag3PO4 reaction systems at different temperatures

T/K	lnk_{nano, tetrapods}	lnk_{nano, cubes}	lnk_{nano, dodecahedrons}	lnk_bulk
298.15	-5.629	-5.694	-5.730	-5.824
303.15	-5.580	-5.641	-5.674	-5.729
308.15	-5.517	-5.582	-5.615	-5.660
313.15	-5.463	-5.524	-5.558	-5.597
318.15	-5.421	-5.479	-5.501	-5.527

Fig.2 Curves of molar surface thermodynamic functions vs. temperature(A) Sms-T; (B) Hms-T; (A) Gms-T. a. Dodecahedrons; b. tetrapods; c. cubes.

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Temperature and Morphology Effect on Surface Thermodynamic Functions of Ag₃PO₄ Microcrystals^†

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