Changes in thermal and electrical properties of bone as a result of 1 MGy-dose γ-irradiation
Changes in thermal and electrical properties of bone as a result of 1 MGy-dose γ-irradiation
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DOI：
10.1016/s0141-8130(03)00071-0
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发表时间：
2003-11-01
影响因子：
8.2
通讯作者：
Jaroszyk, F
中科院分区：
文献类型：
--
作者：
Kubisz, L;Mielcarek, S;Jaroszyk, F
通过差示扫描量热法（DSC）测定电导率和热性能的温度依赖性，可以分析骨中的电荷和热传输过程，骨是复杂的胶原-羟基磷灰石（HAP）-水系统。通过高剂量的伽马辐射对骨结构的修饰改变了骨的电和热特性。骨的电导率（σ）随着连续加热运行而降低。通过胶原大分子主链的断裂解释了在辐照样品中观察到的σ的降低。辐照降低了骨的水化水平，其变性温度，并增加了变性过程的焓和熵。(C)2003年由Elsevier B. V.出版
Determination of temperature dependencies of electric conductivity and thermal properties by differential scanning calorimetry (DSC) allow to analyse the processes of charge and heat transport in the bone being a complex collagen-hydroxyapatite (HAP)-water system. Modification of the bone structure by high doses of gamma-radiation changes the electrical and thermal properties of the bone. Electrical conductivity (sigma) of the bone decreases with consecutive heating runs. The decrease in sigma observed for irradiated samples was explained by the scission of the main chain of collagen macromolecule. Irradiation decreased the hydration level in the bone, its denaturation temperature and increased both enthalpy and entropy of the denaturation process. (C) 2003 Published by Elsevier B.V.