溶解法测定纳米AgCl 的热力学函数
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摘要
为进一步丰富纳米热力学函数研究,采用微乳液法可控制备了纳米氯化银,利用X-射线衍射技术和场发射扫描电镜技术对其物相组成及形貌结构进行了表征。基于纳米溶解热力学理论,进一步得到了纳米AgCl的溶解热力学函数和表面热力学函数。计算了纳米AgCl的规定热力学函数,Δ_fH~θ_m为-115.35 kJ/mol,Δ_fG~θ_m为-105.38 kJ/mol,S~θ_m为121.89 J/(mol·K)。纳米AgCl溶解吉布斯自由能随温度呈正相关,表面吉布斯自由能与温度呈负相关。
In order to further enrich the nano-thermodynamic function, the nano-silver chloride was prepared by micro-emulsion method, and the composition and the morphology of the nano-silver chloride were characterized by the X-ray diffraction technique and the field-emission scanning electron microscope technique. Based on the nano-dissolution thermodynamic theory, the dissolution thermodynamic function and the surface thermodynamic function of the nano-AgCl were obtained. And then the thermodynamic functions of the nano-AgCl were calculated. The results showed that, the Δ_fH~θ_m was-115.35 kJ/mol,Δ_fG~θ_m was-105.38 kJ/mol,S~θ_m was 121.89 J/(mol·K). The free energy of Gibbs free energy was positively correlated with the temperature, and the free energy of surface Gibbs free energy was negatively correlated with the temperature.
In order to further enrich the nano-thermodynamic function, the nano-silver chloride was prepared by micro-emulsion method, and the composition and the morphology of the nano-silver chloride were characterized by the X-ray diffraction technique and the field-emission scanning electron microscope technique. Based on the nano-dissolution thermodynamic theory, the dissolution thermodynamic function and the surface thermodynamic function of the nano-AgCl were obtained. And then the thermodynamic functions of the nano-AgCl were calculated. The results showed that, the Δ_fH~θ_m was-115.35 kJ/mol,Δ_fG~θ_m was-105.38 kJ/mol,S~θ_m was 121.89 J/(mol·K). The free energy of Gibbs free energy was positively correlated with the temperature, and the free energy of surface Gibbs free energy was negatively correlated with the temperature.
引文
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[3] POLSHETTIWAR V,VARMA R S.Green chemistry by nano-catalysis[J].Green Chemistry,2010,12(5):743-754.
[4] YANG C C,MAI Y W.Thermodynamics at the nanoscale:A new approach to the investigation of unique physicochemical properties of nanomaterials[J].Materials Science & Engineering R,2014,79(1):1-40.
[5] 万婷,陈洁,肖明,等.硫化镉纳米管的制备及其原位生长的热力学研究[J].广西大学学报(自然科学版),2017,42(3):1197-1202.
[6] 张娟.粒径和形貌对纳米颗粒吸附热力学和动力学的影响[D].太原:太原理工大学,2017.
[7] HU L,PENG Q,LI Y.Selective synthesis of Co3O4 nanocrystal with different shape and crystal plane effect on catalytic property for methane combustion[J].Journal of the American Chemical Society,2008,130(48):16136-16137.
[8] 肖立柏.粒径对纳米粒子热分解动力学的影响[D].太原:太原理工大学,2009.
[9] XIANG M.Young measure solutions for afourth-order wave equation with variable growth[J].Boundary Value Problems,2015,2015(1):123.
[10] DOUILLARD J M,ZOUNGRANA T,PARTYKA S.Surface gibbs free energy of minerals:some values[J].Journal of Petroleum Science and Engineering,1995,14(1-2):51-57.
[11] BROUGHTON J Q,GILMER G H.Molecular dynamics investigation of the crystal-fluid interface.VI.Excess surface free energies of crystal-liquid systems[J].The Journal of chemical physics,1986,84(10):5759-5768.
[12] VAN DE WALLE C G,NEUGEBAUER J.First-principles surface phase diagram for hydrogen on GaN surfaces[J].Physical review letters,2002,88(6):066103.
[13] 覃方红,邱江源,肖碧源,等.基于溶解热力学原理对纳米卤化银的研究[J].高等学校化学学报,2018,39(10):2214-2220.
[14] 覃方红,吕勇,张美婷,等.基于溶解度法研究纳米AgI的表面热力学函数及规定热力学函数[J].华中师范大学学报(自然科学版),2018,52(4):496-502.
[15] ABBASI A R,MORSALI A.Synthesis and characterization of AgCl nanoparticles under various solvents by ultrasound method[J].Journal of inorganic and organometallic polymers and materials,2013,23(2):286-292.
[16] 庄元其,徐秀珍,杨林楚.照相染料在氯化银晶体上光谱增感作用的计时电位法研究[J].华东理工大学学报,1991(3):307-312.
[17] 曹亮,王作宁,古莉娜.纳米氯化银光催化降解亚甲基蓝性能的研究[J].安徽化工,2012,38(6):13-16.
[18] 郑允权,郭养浩,饶强,等.纳米氯化银/壳聚糖抗菌敷料的制备及功能评价[J].材料科学与工程学报,2016,34(2):188-191.
[19] 李静.氯化银纳米粒子的制备及其表面改性的研究[D].长春:吉林大学,2007.
[20] 傅献彩,沈文霞,姚天扬.物理化学(第四版).下册[M].北京:高等教育出版社,1990.
[21] 黄在银,范高超.化学热力学方法及其纳米物理化学应用[M].北京:科学出版社,2016.
[22] XUE Y Q,YANG X C,CUI Z X,et al.The effect of microdroplet size on the surface tension and Tolman length[J].Journal of Physical Chemistry B,2011,115(1):109-112.
[23] J.A.迪安.兰氏化学手册[M].北京:科学出版社,1991.