期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 260, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2020.124050
关键词
Cadmium sulfide nanospheres; Particle size effect; Temperature effect; Solubility method; Surface thermodynamic function; Prescribed thermodynamic function
资金
- National Natural Science Foundation of China, China [21873022]
- Basic Ability Improvement Project of Young and Middle-Aged Teachers in Guangxi Universities, China [2017KY0167, 2018KY0165]
- Scientific Research Project of Guangxi University for Nationalities, China [2017MDYB007]
- National Natural Science Foundation of Guangxi, China [2017JJA120714y]
- Experimental Technology Innovation and Laboratory Management Research Project of Guangxi University for Nationalities, China [2016 -MDSY008]
Spherical cadmium sulfide (CdS) nanoparticles with different particle sizes were synthesized and characterized in terms of surface thermodynamic functions. The results showed an inverse relationship between particle size and surface thermodynamic functions, as well as an increase in these functions with temperature.
Spherical cadmium sulfide (CdS), with five kinds of particle size ranging from 31 nm to 117 nm were synthesized by microemulsion method. The phase composition and morphology of CdS were characterized by field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD), respectively. Based on solution thermodynamic theory, combined with thermochemical cycle theory and thermodynamic theory, the theoretical models and the relationships between molar surface thermodynamic functions and partial mole surface thermodynamic functions of spherical nanomaterials with different particle sizes were deduced and established. The law and reason of particle size and temperature effects on surface thermodynamic function for cadmium sulfide nanospheres, as well as particle size effects on the prescribed thermodynamic function, were discussed. Results show that the ratio of partial molar surface thermodynamic functions to molar surface thermodynamic functions of CdS nanospheres (G(NP)(s) : G(m)(s), H-NP(s) : H-m(s), S-NP(s) : S-m(s))have the value of 2:3. The reciprocal of particle size is linearly proportional to the molar surface thermodynamic functions, which agreed well with the theoretical thermodynamic models of spherical nanoparticles. With the same particle size, G(m)(s), S-m(s) and H-m(s) all increase as temperature increases. At 298.15 K, the absolute value of Delta(f)G(m)(b,theta) and Delta H-f(m)n,theta both increase while S-m(n,theta) decreases with the particle size of CdS nanospheres increase.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据