欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
利用差示扫描量热法测量了丙三醇水溶液Tg前后的比热容，通过曲线拟合获得AGF模型参数，研究结果表明，该模型很好地预测了（Tg＋20K）以下体系的结构松弛时间,协同重排活化能（△μ’）和协同重排域尺寸（z·）的分析结果表明，只有选择比聚合物大得多的某一协同重排位形数，用AGF方法得到的z·才具有物理意义。作为材料常数的△μ＇随体系水含量的增加而逐渐降低，用Donth方法得到的丙三醇水溶液的协同重排域长度尺度（§CRR）随着水含量的增加逐渐降低，且其变化趋势可与△μ＇的分析结果相符．但用AGF方法和D0nth方法得到的协同重排域寸不能统一。
英文摘要：
In order to examine the validity of entropically based nonlinear Adam-Gibbs equation（AGF） on the describing of cooperative relaxation of H-bond molecular liquid, differential scanning calorimetry （ DSC ） was employed to obtain the specific heat capacities of glycerol aqueous solutions in the temperature range of 118-218 K. Curve fitting technology was used to obtain the AGF model parameters. The results indicate that AGF formula can be used to predict the relaxation time below （ Tg＋20 K）. The temperature-invariant activation energies（△μ＇） and the sizes of cooperatively rearranging region （z＊） were analyzed via AGF model and Johari＇ s method. Physically reasonable z ＊ can only be obtained when larger values of configuration numbers （ W＊ ） were chosen. The values of △μ＇ decreased with increasing water content in the glass. The length scales of the cooperative rearranging region（§CRR） were also estimated from the temperature fluctuation theory proposed by Donth. It was found that the §CRR decreased from 3.01 to 2.06 nm when the fraction of glycerol decreased from 1 to 0. 6 in the solutions. The values of z ＊ obtained by using Johari＇s methods is 3.47 for glycerol, which is significantly less than the number of molecules estimated by Donth＇ method（583） in the CRR.
同期刊论文项目
同项目期刊论文
Entropy generation theory for characterizing the freezing and thawing injury of biological materials
Numerical study on freezing-thawing phase change heat transfer in biological tissue embedded with tw
Composition dependence of the Adam-Gibbs cooperative relaxation parameters in glycerol aqueous solut
Flow boiling of liquid nitrogen in micro-tubes: Part II–Heat transfer characteristics and critical h
Experimental study and analysis of mechanical properties of frozen rabbit aorta by fracture mechanic
Effects of glycerol pretreatment
on recovery and antioxidant
enzyme activities of lyophilized red bl
Numerical study on the effects of large blood vessels on 3-D tissue temperature profiles during cryo
3-D Numerical study on the Induced Heating Effects of embedded Micro/Nanoparticles on Human Body Sub
Water permeability parameters of dermal fibroblast employed in tissue engineering in subzero tempera
Effects of freezing rates and dimethyl sulfoxide concentrations on thermal expansion of rabbit aorta
Freezing osteoblast cells attached to hydroxyapative discs and glass coverslips: Mechanisms of damge
Cryopreservation of tissue-engineered dermal replacement in Me2SO toxicity study and effects of conc
Study of heat shock response of human umbilical vein endothelial cells (HUVECs) using cDNA microarra
Energy-Based Diagnostic and Treatment Techniques—— Possible Applications for Early Detection and Tre
Single-phase pressure drop and heat transfer characteristics of turbulent liquid nitrogen flow in mi
Flow boiling of liquid nitrogen in micro-tubes: Part I–The onset of nucleate boiling, two-phase flow
Immunologic Response Induced by Synergistic Effect of Alternate Cooling and Heating of Breast Cancer
Numerical simulation of selective freezing of target biological tissues following injection of solut
Disclosure of the significant thermal effects of large blood vessels during cryosurgery through infr
Selective freezing of target biological tissues through injection of solutions with specific thermal
Numerical Study on Freezing Heat Transfer in cryosurgery with embedding Two Cryoprobes in Biological
Cellular response of Murine Osteoblasts to Cryopreservation: the influence of attachment to Hydroxya
位置：