Light-induced pattern formation of colloidal particle suspensions driven by optical feedback

2021 ◽  
Author(s):  
Valeriia Bobkova ◽  
Alexander Goenner ◽  
Cornelia Denz
Keyword(s):  
Pattern Formation ◽  
Colloidal Particle ◽  
Optical Feedback ◽  
Particle Suspensions

Slot coating flows of non-colloidal particle suspensions

AIChE Journal ◽  
2016 ◽  
Vol 63 (3) ◽  
pp. 1122-1131 ◽  
Author(s):  
Diego M. Campana ◽  
Luis D. Valdez Silva ◽  
Marcio S. Carvalho
Keyword(s):  
Colloidal Particle ◽  
Particle Suspensions ◽  
Coating Flows ◽  
Slot Coating

Rheological Study of Two-Dimensional Very Anisometric Colloidal Particle Suspensions: From Shear-Induced Orientation to Viscous Dissipation

Langmuir ◽  
2013 ◽  
Vol 29 (17) ◽  
pp. 5315-5324 ◽  
Author(s):  
A. M. Philippe ◽  
C. Baravian ◽  
V. Bezuglyy ◽  
J. R. Angilella ◽  
F. Meneau ◽  
...  
Keyword(s):  
Viscous Dissipation ◽  
Colloidal Particle ◽  
Two Dimensional ◽  
Particle Suspensions ◽  
Rheological Study

THE LIQUID CRYSTAL LIGHT VALVE WITH OPTICAL FEEDBACK: A CASE STUDY IN PATTERN FORMATION

2000 ◽  
Vol 09 (02) ◽  
pp. 183-204 ◽  
Author(s):  
F. T. ARECCHI ◽  
S. BOCCALETTI ◽  
S. DUCCI ◽  
E. PAMPALONI ◽  
P. L. RAMAZZA ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Pattern Formation ◽  
Spatial Patterns ◽  
Optical System ◽  
Nonlinear Optical ◽  
Optical Feedback ◽  
Pattern Selection ◽  
Basic Principles ◽  
Light Valve

A nonlinear optical system, consisting of a liquid crystal light valve with feedback, can display an enormous variety of spatial patterns. Starting from the basic principles of operation, we review several physical configurations enlighting the specificity of each one and the mechanism by which it leads to certain rules of pattern selection.

scholarly journals Experimental spatial rogue patterns in an optical feedback system

2010 ◽  
Vol 10 (12) ◽  
pp. 2727-2732 ◽  
Author(s):  
V. Odent ◽  
M. Taki ◽  
E. Louvergneaux
Keyword(s):  
Pattern Formation ◽  
Optical Feedback ◽  
Modulational Instability ◽  
Feedback System ◽  
Probability Density Functions ◽  
Kerr Medium ◽  
Density Functions ◽  
Long Tail ◽  
One Dimensional ◽  
Highly Nonlinear

Abstract. We study pattern formation in an optical system composed of a Kerr medium subjected to optical feedback but in a regime very far from the modulational instability threshold. In this highly nonlinear regime, the dynamics is turbulent and the associated one-dimensional patterns depict rare and intense localized optical peaks. We analyse numerically and experimentally the statistics and features of these intense optical peaks and show that their probability density functions (PDF) have a long tail indicating the occurrence of rogue events.

scholarly journals H2O/D2O Contrast Variation for Ultra-Small-Angle Neutron Scattering to Minimize Multiple Scattering Effects of Colloidal Particle Suspensions

2018 ◽  
Vol 2 (3) ◽  
pp. 37 ◽  
Author(s):  
Akira Otsuki ◽  
Liliana de Campo ◽  
Christopher Garvey ◽  
Christine Rehm
Keyword(s):  
Neutron Scattering ◽  
Multiple Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Colloidal Particle ◽  
Scattered Intensity ◽  
Particle Suspensions ◽  
Scattering Effects ◽  
Multiple Scattering Effects ◽  
Q Values

This study investigated the use of solvent contrast (H2O/D2O ratio) as a means to optimize the ultra-small-angle neutron scattering (USANS) signal. By optimizing the signal, it was possible to reduce the undesirable effects of coherent multiple scattering while still maintaining a measurable scattered intensity. This result will further enable the use of USANS as a probe of the interactions between colloidal particles and their structures within concentrated suspensions as well as particle dispersion/aggregation. As a model system, we prepared silica colloidal particle suspensions at different solid concentrations. USANS curves were measured using the classical Bonse–Hart double crystal diffractometer while varying the scattering length density of the aqueous phase, thus varying the contrast to the silica particles. As a means of assessing the impact of multiple scattering effects on different q-values, we analyzed the scattered intensity at different contrasts at three different q values. The data were then used to determine the match point of the silica particle suspensions from the expected square root dependence of the scattered intensity with solvent composition, to analyze any differences associated with the solid concentration change, and to determine the optimum H2O/D2O ratio in terms of high transmission (TSAS > 80%) and high enough scattering intensity associated with the contrast of the system. Through this investigation series, we confirmed that adjusting the contrast of the solvent (H2O/D2O) is a good methodology to reduce multiple scattering while maintaining a strong enough scattering signal from a concentrated suspension of silica particles for both USANS and rheometric USANS (rheo-USANS) experiments.

Modulational-induced optical pattern formation in a passive optical-feedback system

1990 ◽  
Vol 7 (6) ◽  
pp. 1039 ◽  
Author(s):  
R. Indik ◽  
J. V. Moloney ◽  
H. Adachihara ◽  
C. Lizarraga ◽  
R. Northcutt ◽  
...  
Keyword(s):  
Pattern Formation ◽  
Optical Feedback ◽  
Feedback System ◽  
Optical Pattern
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