溶液蒸发法左旋葡聚糖单晶生长的研究
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摘要
根据平衡法测量左旋葡聚糖(LG)在四氢呋喃溶剂中的溶解度,以溶液蒸发法在四氢呋喃溶剂中首次生长出LG单晶,并对其生长质量进行了表征。结果表明:(1)在303 K以下温区,左旋葡聚糖在四氢呋喃溶剂中具有较小的温度系数,适用于溶液蒸发法生长单晶;(2)生长出尺寸为0. 85 cm×0. 35 cm×0. 4 cm单晶,晶体结构为正交晶系;(3)通过金相显微镜、拉曼光谱和X射线衍射分析表明,LG单晶质量较好。
The solubility of LG in tetrahydrofuran solvent was measured by weighing method,The growth experiment of LG single crystal in tetrahydrofuran solvent was carried out by using constant temperature solvent evaporation method,and the grown single crystal was characterized. The results show that( 1)there is a the smaller temperature coefficient of solubility below 303 K,which is suitable for the growth of single crystals by Solution evaporation method.( 2) the LG single crystal size which was 0. 85 cm × 0. 35 cm × 0. 4 cm was obtained,and the lattice structure of LG crystals is orthorhombic system.( 3) the metallographic microscope observation,XRD analysis and Raman spectra show that the crystal has good quality.
The solubility of LG in tetrahydrofuran solvent was measured by weighing method,The growth experiment of LG single crystal in tetrahydrofuran solvent was carried out by using constant temperature solvent evaporation method,and the grown single crystal was characterized. The results show that( 1)there is a the smaller temperature coefficient of solubility below 303 K,which is suitable for the growth of single crystals by Solution evaporation method.( 2) the LG single crystal size which was 0. 85 cm × 0. 35 cm × 0. 4 cm was obtained,and the lattice structure of LG crystals is orthorhombic system.( 3) the metallographic microscope observation,XRD analysis and Raman spectra show that the crystal has good quality.
引文
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[2] Bauer T,Khler M,Lunkenheimer P,et al. Relaxation dynamics and ionic conductivity in a fragile plastic crystal[J]. Journal of Chemical Physics,2010,133(14):144509.
[3] Pardo L C,Lunkenheimer P,Loidl A. Alpha and beta relaxation dynamics of a fragile plastic crystal[J]. Journal of Chemical Physics,2006,124(12):124911-124911-7.
[4] Michl M,Bauer T,Lunkenheimer P. Cooperativity and heterogeneity in plastic crystals studied by nonlinear dielectric spectroscopy[J]. Physical Review Letters,2015,114(6):067601.
[5] Shahin M,Murthy S S N. Glass transition phenomena in the crystalline phase of hexa-substituted benzenes[J]. Journal of Chemical Physics,2003,118(118):7495-7503.
[6] Brand R,Lunkenheimer P,Loidl A. Relaxation dynamics in plastic crystals[J]. Journal of Chemical Physics,2002,116(23):10386-10401.
[7] Martínez-García J C,Tamarit J L,Rzoska S J. Universal critical-like scaling of dynamics in plastic crystals[J]. Journal of Non-Crystalline Solids,2011,357(2):329-333.
[8] Elpidio T,Johari G P. Structural fluctuations and orientational glass of levoglucosan-High stability against ordering and absence of structural glass[J]. Journal of Chemical Physics,2015,142(10):139.
[9]刘涉江.溶液法制备不同晶形碳酸钙的研究[D].天津:河北工业大学,2002.
[10]张克从,张乐惠.晶体生长科学与技术(上册)[M].北京:北京科学出版社,1997.
[11]于跃娟.不同过饱和度下ADP晶体的生长与缺陷研究[D].青岛:青岛大学,2012.
[12]常新安,王希敏,张克从. KADP晶体生长研究[J].人工晶体学报,1995(4):304-309.
[13]李云南.溶液过饱和度和氘化程度对KDP/DKDP晶体光学性能影响的研究[D].济南:山东大学,2005.