scholarly journals Light scattering from colloidal aggregates on a hierarchy of length scales

2021 ◽  
Author(s):  
Frank Scheffold ◽  
Pavel Yazhgur ◽  
Geoffroy Aubry ◽  
Luis Froufe
Keyword(s):  
Light Scattering ◽  
Length Scales ◽  
Colloidal Aggregates

Structural Investigation of a Surfactant-Templated Silica Aerogel by Small-angle Scattering

1998 ◽  
Vol 520 ◽  
Author(s):  
Thomas P. Riekerlt ◽  
Mark T. Anderson ◽  
Patricia S. Sawyer ◽  
Shrish Rane ◽  
Gregory Beaucage
Keyword(s):  
Light Scattering ◽  
Small Angle ◽  
Silica Aerogel ◽  
Large Scale ◽  
Structural Investigation ◽  
Structural Information ◽  
Structural Features ◽  
Length Scales ◽  
X Ray ◽  
Angle Scattering

ABSTRACTThe structure of a surfactant-templated silica aerogel is studied by small-angle x-ray and light scattering. By combining the two techniques, we obtain structural information on length scales from Ångstroms to 0.1 millimeters. For this sample, we find five structural features, including the morphology of large scale aggregates.

scholarly journals Structure of PEP–PEO block copolymer micelles: exploiting the complementarity of small-angle X-ray scattering and static light scattering

2011 ◽  
Vol 44 (3) ◽  
pp. 473-482 ◽  
Author(s):  
Grethe Vestergaard Jensen ◽  
Qing Shi ◽  
María J. Hernansanz ◽  
Cristiano L. P. Oliveira ◽  
G. Roshan Deen ◽  
...  
Keyword(s):  
Light Scattering ◽  
Block Copolymer ◽  
Small Angle ◽  
Static Light Scattering ◽  
Length Scales ◽  
X Ray ◽  
X Ray Scattering ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles ◽  
Poly Ethylene

The structure of large block copolymer micelles is traditionally determined by small-angle neutron scattering (SANS), covering a large range of scattering vectors and employing contrast variation to determine the overall micelle morphology as well as the internal structure on shorter length scales. The present work shows that the same information can be obtained by combining static light scattering (SLS) and small-angle X-ray scattering (SAXS), which provide information on, respectively, large and short length scales. Micelles of a series of block copolymers of poly(ethylene propylene)-b-poly(ethylene oxide) (PEP–PEO) in a 70% ethanol solution are investigated. The polymers have identical PEP blocks of 5.0 kDa and varying PEO blocks of 2.8–49 kDa. The SLS contrasts of PEP and PEO are similar, providing a homogeneous contrast, making SLS ideal for determining the overall micelle morphology. The SAXS contrasts of the two components are very different, allowing for resolution of the internal micelle structure. A core–shell model with a PEP core and PEO corona is fitted simultaneously to the SAXS and SLS data using the different contrasts of the two blocks for each technique. With increasing PEO molecular weight, a transition from cylindrical to spherical micelles is observed. This transition cannot be identified from the SAXS data alone, but only from the SLS data.

scholarly journals From nuclei to micro-structure in colloidal crystallization: Investigating intermediate length scales by small angle laser light scattering

2015 ◽  
Vol 143 (6) ◽  
pp. 064903 ◽  
Author(s):  
Richard Beyer ◽  
Markus Franke ◽  
Hans Joachim Schöpe ◽  
Eckhard Bartsch ◽  
Thomas Palberg
Keyword(s):  
Light Scattering ◽  
Small Angle ◽  
Laser Light ◽  
Laser Light Scattering ◽  
Micro Structure ◽  
Length Scales ◽  
Colloidal Crystallization

scholarly journals Modifying the structure and flow behaviour of aqueous montmorillonite suspensions with surfactant

2013 ◽  
Vol 371 (1988) ◽  
pp. 20120262 ◽  
Author(s):  
Yannan Cui ◽  
Claire L. Pizzey ◽  
Jeroen S. van Duijneveldt
Keyword(s):  
Light Scattering ◽  
Sol Gel ◽  
Colloidal Suspensions ◽  
Scattering Data ◽  
Length Scales ◽  
Number Of Factors ◽  
Concentric Cylinders ◽  
Large Length ◽  
Sol Gel Transition ◽  
Gel Transition

Colloidal suspensions of plate-like particles undergo a variety of phase transitions. The predicted isotropic/nematic transition is often pre-empted by a sol/gel transition, especially in suspensions of the most commonly used natural swelling clay montmorillonite (MMT). A number of factors, including charge interactions, flexibility and salt concentration, may contribute to this competition. In this study, the effect of surfactant adsorption on suspensions of MMT was studied using rheology, small-angle X-ray scattering, static light scattering and optical microscopy. The addition of a polyetheramine surfactant reduced the moduli of the system and shifted the sol/gel transition to a much higher clay concentration, compared with suspensions of bare clay particles. Yet, scattering data revealed no change in suspension structure on length scales up to around a micrometre. Primary aggregates remain at this length scale and no nematic phase is formed. There is, however, a change in structure at large length scales (of order 20 μm) where light scattering indicates the presence of string-like aggregates that disappear on addition of surfactant. Microscope images of dried suspensions also revealed a string-like structure. The dried strings show strong birefringence and may consist of concentric cylinders, self-assembled from clay sheets.

Collision induced hyper-Rayleigh light scattering in CCl4

1996 ◽  
Vol 88 (3) ◽  
pp. 683-691 ◽  
Author(s):  
P. KAATZ ◽  
D.P. SHELTON
Keyword(s):  
Light Scattering ◽  
Rayleigh Light Scattering ◽  
Rayleigh Light
Sign in / Sign up

Export Citation Format

Share Document