[其他] 求助

starwu

有没有哪位好心人能告诉我任意一种罗丹明染料分子的体积大小。或者是大约的直径。
万分感谢！！！！

[ 本帖最后由 starwu 于 2008-9-24 21:16 编辑 ]

starwu

帮帮忙吧

starwu

1.罗丹明6G:   Rhodamine 6G( C28H31N2O3Cl)  分子量：479.01

2.罗丹明123: Rhodamine 123   2-(6-Amino-3-imino-3H-xanthen-9-yl)benzoic acid methyl ester (C21H17ClN2O3)   分子量: 380.8
3.罗丹明B:   Rhodamine B  Rhodamine O Tetraethylrhodamine : C28H31ClN2O3   分子量: 479.01

Tracer	mol. wt.	Size (nm)
Albumin	70,000	8
FITC-dextran-3	3,000	2,4
FITC-dextran-20	20,000	6,4
FITC-dextran-70	70,000	11,6
FITC-dextran-150	150,000	17,4
FITC-dextran-2000	2,000,000	10-30
Rhodamine dye B
Sodium fluorescein	376	0, 5

so, 我想应该不会超过1 nm.
我找便了文献都没有有关的内容，我要疯了。

[ 本帖最后由 starwu 于 2008-9-25 13:02 编辑 ]

starwu

The diffusion coefficient of a particle is in turn determined by two properties: the viscosity of the solvent, η, and the hydrodynamic radius of the particle, R. This relationship is described by the Einstein equation below:
D=KT/6*PI*η*R

where K is the Boltzmann constant (1.38x10-23 J/K), T is the temperature, and the particle is assumed to be spherical.
From the well-determined diffusion coefficient of Rhodamine 6G in water, 2.8x10-6 cm2/sec (η = 1.0 cP at 20°C), we can calculate that Rh(R6G) = 7.7x10-10 m.


AM I RIGHT

starwu

我想用它来作为追踪粒子，试验验证我理论计算出的mesh size是否合理。
就是不知道能不能装进我的孔里。