The thermotropic phase transitions layer compound in the perovskite type （n-C）10)H)21)NH3)2ZnCl4 and （n-C）18)H)37)NH3)2ZnCl4 were synthesized and, at the same time, a series of mixtures C10Zn/C18Zn were prepared. ...The thermotropic phase transitions layer compound in the perovskite type （n-C）10)H)21)NH3)2ZnCl4 and （n-C）18)H)37)NH3)2ZnCl4 were synthesized and, at the same time, a series of mixtures C10Zn/C18Zn were prepared. The experimental binary phase diagram of C10Zn/C18Zn was established by means of differential scanning calorimetry （DSC） and X-ray diffraction. In the phase diagram, compound （n-C）10)H)21)NH3)（n-C）21)H)37)NH3)ZnCl4 and two eutectoid invariants were observed; two eutectoid temperatures are about 53 ℃ and 58 ℃. Contrasting with other similar systems, there are three noticeable solid solution ranges at the left and right boundary and middle of the phase diagram.展开更多
Latent heat storage performance of a layered perovskite-type compound, 1-C14H29NH3）2ZnCl4（C14Zn）,embedded in a series of silica gel（SG） with pore sizes of d = 15–200 nm is investigated using differential scannin...Latent heat storage performance of a layered perovskite-type compound, 1-C14H29NH3）2ZnCl4（C14Zn）,embedded in a series of silica gel（SG） with pore sizes of d = 15–200 nm is investigated using differential scanning calorimetry（DSC）, and powder X-ray diffractions（XRD）. C14Zn in the nanopores of silica gel shows size-dependent phase transition temperature, enthalpy change and supercooling. They have a stable transition temperature and heat capacity at each size in a short-term thermal cycling. Similar Xray diffraction patterns are observed for the nano-sized and the bulk C（14）Zn. The encapsulation of a phase change material in nanopores is a new way of tuning its thermal energy storage properties for a wider range of temperature regulation.展开更多
文摘The thermotropic phase transitions layer compound in the perovskite type （n-C）10)H)21)NH3)2ZnCl4 and （n-C）18)H)37)NH3)2ZnCl4 were synthesized and, at the same time, a series of mixtures C10Zn/C18Zn were prepared. The experimental binary phase diagram of C10Zn/C18Zn was established by means of differential scanning calorimetry （DSC） and X-ray diffraction. In the phase diagram, compound （n-C）10)H)21)NH3)（n-C）21)H)37)NH3)ZnCl4 and two eutectoid invariants were observed; two eutectoid temperatures are about 53 ℃ and 58 ℃. Contrasting with other similar systems, there are three noticeable solid solution ranges at the left and right boundary and middle of the phase diagram.
基金financial support from National Natural Science Found of China (No. 21273138)
文摘Latent heat storage performance of a layered perovskite-type compound, 1-C14H29NH3）2ZnCl4（C14Zn）,embedded in a series of silica gel（SG） with pore sizes of d = 15–200 nm is investigated using differential scanning calorimetry（DSC）, and powder X-ray diffractions（XRD）. C14Zn in the nanopores of silica gel shows size-dependent phase transition temperature, enthalpy change and supercooling. They have a stable transition temperature and heat capacity at each size in a short-term thermal cycling. Similar Xray diffraction patterns are observed for the nano-sized and the bulk C（14）Zn. The encapsulation of a phase change material in nanopores is a new way of tuning its thermal energy storage properties for a wider range of temperature regulation.
