Light Scattering of Particles Embedded in Soft Hydrogel

1995 ◽  
Vol 60 (10) ◽  
pp. 1719-1727 ◽  
Author(s):  
Minmin Tian ◽  
Zdeněk Tuzar ◽  
Petr Munk
Keyword(s):  
Particle Size ◽  
Light Scattering ◽  
Block Copolymer ◽  
Molar Mass ◽  
Second Virial Coefficient ◽  
Narrow Particle Size Distribution ◽  
Radius Of Gyration ◽  
Structure Information ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

This study is concerned with soft polyacrylamide gels in which are embedded either polystyrene latexes or block copolymer micelles with polystyrene cores and poly(methacrylic acid) shells. We have found that light scattering provides useful structure information about the systems. For polystyrene latexes, both molar mass and radius of gyration do not change during the embedding in the hydrogel; for block copolymer micelles, molar mass does not change, while the size decreases upon immobilization. In all cases, the second virial coefficient is very small and overshadowed by the turbidity of the sample. For large particles with narrow particle size distribution, a combination of Guinier and Zimm plots has been used for obtaining the particle size and molar mass.

Fluorometric and Ultraviolet−Visible Absorption Study of Poly(methacrylic acid) Shells of High-Molar-Mass Block Copolymer Micelles†

Langmuir ◽  
1999 ◽  
Vol 15 (12) ◽  
pp. 4185-4193 ◽  
Author(s):  
Miroslav Štěpánek ◽  
Klára Podhájecká ◽  
Karel Procházka ◽  
Yue Teng ◽  
Stephen E. Webber
Keyword(s):  
Block Copolymer ◽  
Methacrylic Acid ◽  
Molar Mass ◽  
Absorption Study ◽  
Visible Absorption ◽  
High Molar Mass ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

Light scattering evidence of selective protein fouling on biocompatible block copolymer micelles

Nanoscale ◽  
2012 ◽  
Vol 4 (15) ◽  
pp. 4504 ◽  
Author(s):  
Fernando C. Giacomelli ◽  
Petr Stepánek ◽  
Vanessa Schmidt ◽  
Eliézer Jäger ◽  
Alessandro Jäger ◽  
...  
Keyword(s):  
Light Scattering ◽  
Block Copolymer ◽  
Protein Fouling ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

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.

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