Diffusion of oxygen in water and hydrocarbons using an electron spin resonance spin-label technique.
Diffusion of oxygen in water and hydrocarbons using an electron spin resonance spin-label technique.
复制标题
使用电子自旋共振自旋标记技术在水和碳氢化合物中扩散氧气。
DOI：
10.1016/s0006-3495(84)84217-4
复制
发表时间：
1984
影响因子：
3.4
通讯作者：
Hyde,JS
中科院分区：
文献类型：
--
作者：
Subczynski,WK;Hyde,JS
带自旋标签的溶解氧分子双分子碰撞率的Smoluchowski方程得出的氧在水中的扩散常数值与Stokes-Einstein方程（D∞T/eta，其中eta是宏观粘度）和用常规方法得到的已发表值一致。在相互作用距离为4.5 A时，每次相遇发生海森堡交换的概率接近1。在混合烃（橄榄油，石蜡油）和仲丁基苯中，D无限大（T/），其中介于0.5和1之间。氧在碳氢化合物中的扩散速度比根据宏观粘度预测的要快10到100倍。氧气在模型和生物膜中的扩散也有类似的结果。平行测量自旋标签的旋转扩散与氧的平动扩散几乎没有相关性。自旋标签和氧之间的偶极相互作用，除了在最高粘度的极限之外，似乎可以忽略不计。
The Smoluchowski equation for the bimolecular collision rate of dissolved oxygen molecules with spin labels yielded values for the diffusion constant of oxygen in water that are in agreement with the Stokes-Einstein equation (D infinity T/eta, where eta is the macroscopic viscosity) and with published values obtained by conventional methods. Heisenberg exchange at an interaction distance of 4.5 A occurs with a probability close to one for each encounter. In mixed hydrocarbons (olive oil, paraffin oils) and sec-butyl benzene, D infinity (T/eta)rho, where rho lies between 0.5 and 1. Oxygen diffuses in the hydrocarbons between 10 and 100 times more rapidly than predicted from the macroscopic viscosity. Similar results would be expected for diffusion of oxygen in model and biological membranes. Parallel measurements of rotational diffusion of the spin labels show little correlation with measurements of translational diffusion of oxygen. Dipolar interactions between spin labels and oxygen appear negligible except in the limit of highest viscosities.