Light-induced structural evolution of photoswitchable carbohydrate-based surfactant micelles

2015 ◽  
Vol 51 (25) ◽  
pp. 5509-5512 ◽  
Author(s):  
Rico F. Tabor ◽  
Matthew J. Pottage ◽  
Christopher J. Garvey ◽  
Brendan L. Wilkinson
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Structural Changes ◽  
Structural Evolution ◽  
Time Resolved ◽  
Surfactant Micelles ◽  
First Time ◽  
Over Time

We report the light-induced structural evolution of photoswitchable carbohydrate-based surfactant micelles using time-resolved small-angle neutron scattering (TR-SANS), monitoring the structural changes in micellisation in situ over time and demonstrating for the first time the course and implications of this process.

scholarly journals Deswelling of microfibril bundles in drying wood studied by small-angle neutron scattering and molecular dynamics

Cellulose ◽  
2021 ◽  
Author(s):  
Aleksi Zitting ◽  
Antti Paajanen ◽  
Lauri Rautkari ◽  
Paavo A. Penttilä
Keyword(s):  
Molecular Dynamics ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Structural Changes ◽  
Md Simulations ◽  
Cellulose Microfibrils ◽  
Dynamic Vapor Sorption ◽  
Time Resolved ◽  
Constant Rate

Abstract Structural changes of cellulose microfibrils and microfibril bundles in unmodified spruce cell wall due to drying in air were investigated using time-resolved small-angle neutron scattering (SANS). The scattering analysis was supported with dynamic vapor sorption (DVS) measurements to quantify the macroscopic drying kinetics. Molecular dynamics (MD) simulations were carried out to aid in understanding the molecular-level wood-water interactions during drying. Both SANS experiments and simulations support the notion that individual cellulose microfibrils remain relatively unaffected by drying. There is, however, a significant decrease in fibril-to-fibril distances in microfibril bundles. Both scattering and DVS experiments showed two distinct drying regions: constant-rate drying and falling-rate drying. This was also supported by the MD simulation results. The shrinking of the fibril bundles starts at the boundary of these two regions, which is accompanied by a strong decrease in the diffusivity of water in between the microfibrils. Graphic abstract

KWS-1 high-resolution small-angle neutron scattering instrument at JCNS: current state

2015 ◽  
Vol 48 (1) ◽  
pp. 61-70 ◽  
Author(s):  
Artem V. Feoktystov ◽  
Henrich Frielinghaus ◽  
Zhenyu Di ◽  
Sebastian Jaksch ◽  
Vitaliy Pipich ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Grazing Incidence ◽  
Current State ◽  
Sample Position ◽  
Heavy Loads ◽  
First Time

The KWS-1 small-angle neutron scattering (SANS) instrument operated by the Jülich Centre for Neutron Science (JCNS) at the research reactor FRM II of the Heinz Maier-Leibnitz Zentrum in Garching near Munich has been recently upgraded. The KWS-1 instrument was updated, from its active collimation apertures to the detector cabling. Most of the parts of the instrument were installed for the first time, including a broadband polarizer, a large-cross-section radio-frequency spin flipper, a chopper and neutron lenses. A custom-designed hexapod in the sample position allows heavy loads and precise sample positioning in the beam for conventional SANS experiments as well as for grazing-incidence SANS under applied magnetic field. With the foreseenin situpolarization analysis the main scientific topic of the instrument tends towards magnetism. The performance of the polarizer and flipper was checked with a polarized3He cell at the sample position. The results of these checks and a comparison of test measurements on a ferrofluid in a magnetic field with polarized and nonpolarized neutrons are presented.

scholarly journals Low-temperature dynamics of magnetic colloids studied by time-resolved small-angle neutron scattering

2008 ◽  
Vol 77 (18) ◽  
Author(s):  
A. Wiedenmann ◽  
U. Keiderling ◽  
M. Meissner ◽  
D. Wallacher ◽  
R. Gähler ◽  
...  
Keyword(s):  
Low Temperature ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Time Resolved ◽  
Temperature Dynamics ◽  
Magnetic Colloids

Correlation between the geometrical shape and growth behaviour of surfactant micelles investigated with small-angle neutron scattering

Soft Matter ◽  
2014 ◽  
Vol 10 (46) ◽  
pp. 9362-9372 ◽  
Author(s):  
L. M. Bergström ◽  
I. Grillo
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Geometrical Shape ◽  
Growth Behaviour ◽  
Surfactant Micelles

Growth behaviour and how it is related to the geometrical shape of mixed CTAB/SOS micelles has been investigated with SANS.

An in situ small angle neutron scattering study of expanded graphite under a uniaxial stress

Carbon ◽  
2013 ◽  
Vol 57 ◽  
pp. 460-469 ◽  
Author(s):  
Félix Balima ◽  
Vittoria Pischedda ◽  
Sylvie Le Floch ◽  
Annie Brûlet ◽  
Peter Lindner ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Expanded Graphite ◽  
Uniaxial Stress ◽  
Scattering Study ◽  
Neutron Scattering Study
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