Phase Transition Dynamics and Microstructure Evolution in a Crystalline Surfactant Mesophase Using Time-Dependent Small-Angle Neutron Scattering

Langmuir ◽  
2003 ◽  
Vol 19 (15) ◽  
pp. 6329-6332 ◽  
Author(s):  
Blake Simmons ◽  
Vivek Agarwal ◽  
Mohit Singh ◽  
Gary McPherson ◽  
Vijay John ◽  
...  
Keyword(s):  
Phase Transition ◽  
Neutron Scattering ◽  
Microstructure Evolution ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Time Dependent ◽  
Transition Dynamics

Necklace-like microstructure in shallow-quenched aqueous solutions of poly(n-isopropylacrylamide), detected by advanced small-angle neutron scattering methods

Soft Matter ◽  
2019 ◽  
Vol 15 (4) ◽  
pp. 671-682 ◽  
Author(s):  
Satoshi Koizumi ◽  
Masahiko Annaka ◽  
Dietmar Schwahn
Keyword(s):  
Phase Transition ◽  
Aqueous Solutions ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Volume Phase Transition ◽  
Volume Phase ◽  
Isopropyl Acrylamide

The microstructure of aqueous poly(N-isopropyl acrylamide) (PNIPA) gel and solution was investigated by small-angle neutron scattering (SANS) in the vicinity of the gel volume phase transition at TV (= 34 °C).

Small-angle neutron scattering characterization of processing/microstructure relationships in the sintering of crystalline and glassy ceramics

1991 ◽  
Vol 6 (12) ◽  
pp. 2706-2715 ◽  
Author(s):  
G.G. Long ◽  
S. Krueger ◽  
R.A. Gerhardt ◽  
R.A. Page
Keyword(s):  
Neutron Scattering ◽  
Microstructure Evolution ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Average Pore Size ◽  
Unit Surface Area ◽  
Average Pore ◽  
Sintering Mechanisms ◽  
Alpha Alumina

Small-angle neutron scattering measurements were used to examine the pore microstructure evolution of glassy silica and polycrystalline alpha-alumina as a function of sintering. It was shown that the two major sintering mechanisms, viscous flow and surface and volume diffusion, lead to very different microstructure evolution signatures in terms of the average pore size as a function of density. However, with respect to topology, the evolution of the porosity per unit surface area as a function of density is remarkably similar in the two systems.

A Small-Angle Neutron Scattering Investigation of the TDMAO Micelle System at High Hydrostatic Pressure

1997 ◽  
Vol 30 (5) ◽  
pp. 739-743 ◽  
Author(s):  
N. Gorski ◽  
J. Kalus ◽  
A. I. Kuklin ◽  
L. S. Smirnov
Keyword(s):  
Phase Transition ◽  
Neutron Scattering ◽  
Phase Ii ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Accurate Determination ◽  
Structural Phase ◽  
Phase Behaviour ◽  
Transition Line ◽  
Pressure Phase

The phase behaviour and phase transition of the tetradecyldimethylaminoxide micellar system TDMAO/ D2O have been investigated by small-angle neutron scattering (SANS) at temperatures T between 287 and 325 K, pressures up to P = 842 MPa and at TDMAO concentrations of 55 and 102 mmol l−1. A pressure-induced structural (shape) phase transition was observed for the whole pressure versus temperature range, with a slope of the transition line of dTm /dP ≃ 0.31° MPa−1. The reversibility and reproducibility of this phase change were tested. The SANS experiments showed a pressure-induced structural phase transition from a low-pressure phase (i), where rod-like micelles with a radius of R = 1.94 ± 0.03 nm were present, to a high-pressure phase (ii). An accurate determination of the structure of phase (ii) has not been possible up to now. In phase (ii), a discrete correlation peak in the Q range 1.8–2.2 nm−1 was found.

Rheology, birefringence, and small-angle neutron scattering in a charged micellar system: Evidence of a shear-induced phase transition

1997 ◽  
Vol 56 (2) ◽  
pp. 1869-1878 ◽  
Author(s):  
E. Cappelaere ◽  
J. F. Berret ◽  
J. P. Decruppe ◽  
R. Cressely ◽  
P. Lindner
Keyword(s):  
Phase Transition ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Micellar System
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