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yangb16

新虫 (小有名气)

[求助] DOSY测的扩散系数和粒径的公式 已有1人参与

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xiaoqiuqiu20

木虫之王 (文学泰斗)

usa

【答案】应助回帖

感谢参与,应助指数 +1
Diffusion coefficient, D
D = (1/f)kT

f - frictional coefficient
k, T, - Boltzman constant, absolute temperature

f = 6p h r

h - viscosity
r - radius of sphere
The value for f calculated for a sphere is a minimal value; asymmetric shape of molecule or non-elastic interaction with solvent (e.g. hydration) will increase f.

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2楼2021-02-21 20:53:12
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yangb16

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2楼: Originally posted by xiaoqiuqiu20 at 2021-02-21 20:53:12
Diffusion coefficient, D
D = (1/f)kT

f - frictional coefficient
k, T, - Boltzman constant, absolute temperature

f = 6p h r

h - viscosity
r - radius of sphere
The value for f calculated f ...

非常感谢

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3楼2021-02-21 22:19:38
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