scholarly journals Particle aggregation mechanisms in ionic liquids

2014 ◽  
Vol 16 (20) ◽  
pp. 9515-9524 ◽  
Author(s):  
Istvan Szilagyi ◽  
Tamas Szabo ◽  
Anthony Desert ◽  
Gregor Trefalt ◽  
Tamas Oncsik ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Light Scattering ◽  
Particle Aggregation ◽  
Time Resolved

Time-resolved light scattering techniques reveal that viscous and solvation stabilization is relevant in ionic liquids and their water mixtures.

scholarly journals Surfactant mediated particle aggregation in nonpolar solvents

2019 ◽  
Vol 21 (35) ◽  
pp. 18866-18876 ◽  
Author(s):  
Mojtaba Farrokhbin ◽  
Biljana Stojimirović ◽  
Marco Galli ◽  
Mohsen Khajeh Aminian ◽  
Yannick Hallez ◽  
...  
Keyword(s):  
Light Scattering ◽  
Aggregation Behavior ◽  
Particle Aggregation ◽  
Time Resolved ◽  
Nonpolar Solvents

The aggregation behavior of particles in nonpolar media is studied with time-resolved light scattering.

A Time-Resolved Low-Angle Light Scattering Apparatus. Application to Phase Separation Problems in Polymer Systems

2001 ◽  
Vol 66 (6) ◽  
pp. 973-982 ◽  
Author(s):  
Čestmír Koňák ◽  
Jaroslav Holoubek ◽  
Petr Štěpánek
Keyword(s):  
Phase Separation ◽  
Light Scattering ◽  
Signal To Noise Ratio ◽  
Scattered Light ◽  
Ccd Camera ◽  
Time Resolved ◽  
Polymer Systems ◽  
Software Analysis ◽  
Phase Separation Kinetics ◽  
Small Angle Light Scattering

A time-resolved small-angle light scattering apparatus equipped with azimuthal integration by means of a conical lens or software analysis of scattering patterns detected with a CCD camera was developed. Averaging allows a significant reduction of the signal-to-noise ratio of scattered light and makes this technique suitable for investigation of phase separation kinetics. Examples of applications to time evolution of phase separation in concentrated statistical copolymer solutions and dissolution of phase-separated domains in polymer blends are given.

scholarly journals Lateral association and elongation of vimentin intermediate filament proteins: A time-resolved light-scattering study

2016 ◽  
Vol 113 (40) ◽  
pp. 11152-11157 ◽  
Author(s):  
Carlos G. Lopez ◽  
Oliva Saldanha ◽  
Klaus Huber ◽  
Sarah Köster
Keyword(s):  
Light Scattering ◽  
Quantitative Model ◽  
Radius Of Gyration ◽  
Time Resolved ◽  
Intermediate Filament Proteins ◽  
Hierarchical Assembly ◽  
Lateral Association ◽  
Cytoskeletal Filament ◽  
Longitudinal Association ◽  
Scattering Study

Vimentin intermediate filaments (IFs) are part of a family of proteins that constitute one of the three filament systems in the cytoskeleton, a major contributor to cell mechanics. One property that distinguishes IFs from the other cytoskeletal filament types, actin filaments and microtubules, is their highly hierarchical assembly pathway, where a lateral association step is followed by elongation. Here we present an innovative technique to follow the elongation reaction in solution and in situ by time-resolved static and dynamic light scattering, thereby precisely capturing the relevant time and length scales of seconds to minutes and 60–600 nm, respectively. We apply a quantitative model to our data and succeed in consistently describing the entire set of data, including particle mass, radius of gyration, and hydrodynamic radius during longitudinal association.

Time-resolved light scattering study on the gelation process of poly(N-isopropyl acrylamide

Polymer ◽  
1998 ◽  
Vol 39 (13) ◽  
pp. 2769-2775 ◽  
Author(s):  
Tomohisa Norisuye ◽  
Mitsuhiro Shibayama ◽  
Shunji Nomura
Keyword(s):  
Light Scattering ◽  
Time Resolved ◽  
Gelation Process ◽  
Isopropyl Acrylamide ◽  
Scattering Study

Time-Resolved Small Angle X-Ray Scattering and Dynamic Light Scattering Studies of Sol-Gel Transition in Gelatin

1988 ◽  
Vol 143 ◽  
Author(s):  
Dan Q. Wu ◽  
Benjamin Chu
Keyword(s):  
Light Scattering ◽  
Cross Section ◽  
Sol Gel ◽  
Slow Mode ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Saxs Intensity ◽  
Sol Gel Transition ◽  
Gel Transition

AbstractStructural and dynamical properties of an aqueous gelatin solution (5 wt%, 0.1M NaCi, pH=7) in a sol-gel transition were studied by time-resolved small angle x-ray scattering (SAXS) and dynamic light scattering (DLS) after quenching the gelatin sol at ∼45”C to 11°C. SAXS intensity measurements suggested the presence of gel fibrils which grew initially in cross-section. The average cross-section of the gel fibrils reached a constant value after an initial growth period of ∼800 sec. Further increase in SAXS intensity could be attributed to the increase in the length of the gel fibrils. Photon correlation, on the other hand, clearly showed two relaxation modes in both the sol and the gel (∼1 hr after the quenching process) states: a fast cooperative diffusion mode which remained constant from the sol to the gel state after correction for the temperature dependence of solvent viscosity; and a slow mode that could be attributed to the self-diffusion of the “free” gelatin chains and aggregates. The slow mode contribution to the time correlation function was reduced from ∼40% in sol to ∼20% in gel signaling a decrease but not the elimination of “free” particles in the gel network. The decrease in the intensity contribution by the slow mode is, however, accompanied by a large increase in the characteristic line-width distribution.

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