Exploring the transition of polydopamine-shelled perfluorohexane emulsion droplets into microbubbles using small- and ultra-small-angle neutron scattering

2021 ◽  
Vol 23 (16) ◽  
pp. 9843-9850
Author(s):  
Mark Louis P. Vidallon ◽  
Luke W. Giles ◽  
Simon Crawford ◽  
Alexis I. Bishop ◽  
Rico F. Tabor ◽  
...  
Keyword(s):  
Phase Transition ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Colloidal Systems ◽  
Perfluorocarbon Emulsion ◽  
Emulsion Droplets

Perfluorocarbon emulsion droplets are interesting colloidal systems with applications in biomedicine. This work describes the use of small- and ultra-small-angle neutron scattering in studying their heat-induced phase transition into microbubbles.

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).

scholarly journals Simultaneous light and small-angle neutron scattering on aggregating concentrated colloidal suspensions

2003 ◽  
Vol 36 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Sara Romer ◽  
Claus Urban ◽  
Vladimir Lobaskin ◽  
Frank Scheffold ◽  
Anna Stradner ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Dynamic Properties ◽  
Sol Gel ◽  
Colloidal Suspensions ◽  
Gel Point ◽  
Local Dynamic ◽  
Colloidal Systems ◽  
High Concentration

A new sample environment has been developed in order to perform light and small-angle neutron scattering (SANS) simultaneously on colloidal systems. The combination of SANS and diffusing wave spectroscopy (DWS) is of particular use in the high-concentration regime. DWS provides information on the local dynamic properties of the individual particles, whereas SANS gives access to the structural properties on similar length scales. The combination of both methods thus allows one to obtain structural and dynamic information over a very large range of length and time scales. Using this new setup, the onset of aggregation and the sol–gel transition in concentrated destabilized polystyrene sphere suspensions have been investigated. At the gel point, a dramatic change of the particle dynamics from diffusion to a subdiffusive arrested motion is observed. However, while the DWS measurements indicate that dramatic changes in the local dynamics occur over a long period, the SANS pattern quickly reaches its final appearance. The SANS experiments thus indicate that a fluid-like structure is arrested in the course of the gel formation. The data are found to be in good qualitative agreement with computer simulations.

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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