Effects of Vesicle Size and Shape on Static and Dynamic Light Scattering Measurements

Langmuir ◽  
2003 ◽  
Vol 19 (18) ◽  
pp. 7488-7497 ◽  
Author(s):  
Jeremy Pencer ◽  
F. Ross Hallett
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Vesicle Size ◽  
Size And Shape ◽  
Scattering Measurements

scholarly journals Size and Shape of Human Fibrinogen in Solution

1977 ◽  
Author(s):  
V. Hofmann ◽  
P.W. Straub ◽  
T. Binkert ◽  
E. Serrallach ◽  
W. Känzig ◽  
...  
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Analytical Ultracentrifugation ◽  
Rotational Diffusion ◽  
Axial Ratio ◽  
Major Axis ◽  
Fluorescence Depolarization ◽  
Human Fibrinogen ◽  
Size And Shape ◽  
Rotational Diffusion Coefficients

In order to obtain information on size and shape of the fibrinogen molecule in solution the translational diffusion coefficient (DT), the rotational diffusion coefficients (DR⊥ and DR//) and the sedimentation coefficients (S) have been measured on human fibrinogen with a clottaoility above 95%. The methods used were dynamic light scattering, nanosecond fluorescence depolarization and analytical ultracentrifugation. Dynamic light scattering yields DT = 2.0 ± 3% x 10-7 cm2sec–1 at a concentration of 7 mg/ml in 0.15 M Tris-NaCl, pH 7.4. DT is strongly dependent on concentration, being 3.4 ± 10% × 10-7 cm2 sec-1 at 0.1 mg/ml. The rotation along the minor axis as measured with the same method is DR = // 1.5 × 106 sec-1 at 0.1 mg/ml. The rotation along the major axis as measured on fibrinogen labeled with dansylchloride is DR// = 1.5 x106 sec–1. S is also strongly dependent on concentration, being 7.9 S at 0.1 mg/ml, 8.1 S at 1 mg/ml and 6.6 S at 10 mg/ml.These results fit with an elongated molecule having an axial ratio of 7. They are compatible with a MW of 340’000 only for concentrations above 2 mg/ml, while at lower concentrations (0.1 mg/ml) they agree with a MW of approximately half the accepted value.

scholarly journals Sulfonitric Treatment of Multiwalled Carbon Nanotubes and Their Dispersibility in Water

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2442 ◽  
Author(s):  
Hui Liu ◽  
Jianfeng Wang ◽  
Jiachen Wang ◽  
Suping Cui
Keyword(s):  
Carbon Nanotubes ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Multiwalled Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
Oxidation Degree ◽  
Multiwalled Carbon ◽  
X Ray ◽  
Scattering Measurements ◽  
Ft Ir

In this study, Multiwalled carbon nanotubes (MWCNTs) were oxidized by a mixture of sulfuric acid and nitric acid (V:V = 3:1) at 70 °C for 1, 2, and 4 h, respectively. The oxidized MWCNTs were characterized by N2 adsorption, Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), thermal gravimetric analysis (TGA), and Raman spectroscopy to determine the oxidation degree. The dispersion of the MWCNTs was investigated by UV-vis-NIR, SEM, and dynamic light scattering measurements. Results show that sulfonitric treatment increased the surface area and total pore volume and reduced the average pore diameter of MWCNTs. The treatment promoted the formation of oxidized species on the surface MWCNTs, as identified by FT-IR, TGA, and X-ray photoelectron spectroscopy measurements, and more oxygen-containing functional groups were generated when treatment time was extended. Moreover, a general relationship between oxidation degree and dispersibility of MWCNTs in water was established. UV-vis-NIR and dynamic light scattering measurements and SEM images revealed that MWCNTs with higher oxidation degree showed better dispersibility in water.

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