Time-resolved light scattering and FTIR spectroscopic studies on blends of polypropylene grafted with maleic anhydride and zinc salt of sulfonated EPDM lonomer

2000 ◽  
Vol 40 (8) ◽  
pp. 1816-1824 ◽  
Author(s):  
Chang-Sik Ha ◽  
Young-Wook Cho ◽  
Won-Jei Cho ◽  
Youngkyoo Kim ◽  
Takashi Inoue
Keyword(s):  
Light Scattering ◽  
Maleic Anhydride ◽  
Spectroscopic Studies ◽  
Zinc Salt ◽  
Time Resolved

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.

scholarly journals Spectroscopic Studies of Dual Fluorescence in 2-(4-Fluorophenylamino)-5-(2,4-dihydroxybenzeno)-1,3,4-thiadiazole: Effect of Molecular Aggregation in a Micellar System

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2861 ◽  
Author(s):  
Grzegorz Czernel ◽  
Arkadiusz Matwijczuk ◽  
Dariusz Karcz ◽  
Andrzej Górecki ◽  
Agnieszka Niemczynowicz ◽  
...  
Keyword(s):  
Light Scattering ◽  
Fluorescence Spectra ◽  
Single Photon ◽  
Spectroscopic Studies ◽  
Fluorescence Probes ◽  
Molecular Aggregation ◽  
Micellar System ◽  
Dual Fluorescence ◽  
Fluorescence Measurements ◽  
Ionic Detergent

The article presents the results of spectroscopic studies focused on a selected compound from the 1,3,4-thiadiazole group—2-(4-fluorophenylamino)-5-(2,4-dihydroxybenzeno)-1,3,4-thia-diazole (FABT)—in a micellar system formed by Triton X-100, a non-ionic detergent. Fluorescence measurements revealed the phenomenon of dual fluorescence whose emergence is related to the particular molecular organisation of the compound, which depends both on the concentration of the detergent and, most of all, the concentration of the compound itself. Dual fluorescence of FABT in a micellar system was observed for the compound dissolved in a methanol aqueous system, i.e., an environment wherein the dual fluorescence of the compound had never been reported before. Based on the interpretation of UV-Vis electronic absorption, resonance light scattering (RLS), emission and excitation fluorescence spectra, as well as measurements of dynamic light scattering (DLS) and Principal Component Analysis (PCA), we were able to relate the occurrence of this effect to the process of molecular aggregation taking place between FABT molecules in the micellar system in question. Results of fluorescence spectra measurements and time-correlated single photon counting (TCSPC) indicate that dual fluorescence occurs at detergent concentrations necessary to form micellar systems, which in turn facilitate the process of aggregation of FABT molecules. The correlation between the observed fluorescence effects and the previous measurements performed for analogues from this group suggests the possibility of charge transfer (CT) within the range of detergent concentrations wherein the aforementioned fluorescence effects are observed. It ought to be emphasised that this type of fluorescence effects are relatively easy to induce, which predisposes this groups of fluorophores as ideal fluorescence probes in the context of biological samples.

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 spectroscopic studies of a FXR discharge

1968 ◽  
Vol 213 (3) ◽  
pp. 215-226 ◽  
Author(s):  
J. E. Persson ◽  
S. K. HÄndel ◽  
A. Englund ◽  
A. Dejke
Keyword(s):  
Spectroscopic Studies ◽  
Time Resolved
Sign in / Sign up

Export Citation Format

Share Document