Tuning the structure, thermal stability and rheological properties of liquid crystal phases via the addition of silica nanoparticles

2019 ◽  
Vol 21 (46) ◽  
pp. 25649-25657 ◽  
Author(s):  
Joshua B. Marlow ◽  
Thomas M. McCoy ◽  
Cat Q. Ho ◽  
Liliana de Campo ◽  
Robert Knott ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Liquid Crystal ◽  
Light Microscopy ◽  
Surface Chemistry ◽  
Silica Nanoparticles ◽  
Rheological Properties ◽  
Small Angle ◽  
Angle Scattering ◽  
Liquid Crystal System ◽  
Crystal Phases

The effects of adding silica nanoparticles of varying size and surface chemistry to a liquid crystal system were analysed using small-angle scattering and polarising light microscopy, with varying temperature and applied shear.

Liquid Crystals in Ternary Polyoxyethylene Trisiloxane Surfactant - Silicone Oil - H2O System

1996 ◽  
Vol 425 ◽  
Author(s):  
X. Li ◽  
R. M. Hill ◽  
L. E. Scriven ◽  
H. T. Davis
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Small Angle ◽  
Silicone Oil ◽  
Head Group ◽  
X Ray ◽  
X Ray Scattering ◽  
Crystal Phases ◽  
Liquid Crystal Phases ◽  
Ray Scattering

AbstractPolyethylene trisiloxane surfactants M(D′En)M (n=6, 8, 10, 12) self assemble into sheet-like structure and form various lyotropic cubic, hexagonal and lamellar liquid crystal phases in ternary trisiloxane surfactant - silicone oil - water systems. Small angle X-ray scattering (SAXS) was used to identify and characterize the liquid crystal phases. Cyclic octamethylcyclotetrasiloxane (D4), decamethyl-cyclopentasiloxane(D5) and short linear decamethyltetrasiloxane (MD2M) silicone oils facilitate the formation of liquid crystals. The structures in liquid crystals (LC) progress from zero curvature lamellar liquid crystals to higher curvature cubic liquid crystals with increasing the surfactant hydrophilic head group size. The effects of surfactant and oil concentration on the lamellar bilayer thickness and molecular packing were studied with small angle X-ray scattering.

Observation of blue phase in chiral nematic liquid crystal and its stabilization by silica nanoparticles

2016 ◽  
Vol 30 (05) ◽  
pp. 1650011 ◽  
Author(s):  
Arshdeep Singh ◽  
Praveen Malik ◽  
Divya Jayoti
Keyword(s):  
Thermal Stability ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Binary Mixture ◽  
Silica Nanoparticles ◽  
Formation Process ◽  
Temperature Range ◽  
Chiral Nematic ◽  
Blue Phase ◽  
Thermal Stability Of

In the present work, we report the blue phase (BP) in a binary mixture of cholesteryl nonanoate (CN) and N-(4-ethoxybenzylidene)-4-butylaniline (EBBA). The mixture exhibits BP over a temperature range of 2.3 K at optimum composition (50:50) of liquid crystals (LCs). The effect of silica nanoparticles (SNPs) doping on thermal stability of BPs has also been demonstrated and nearly 6 K wide BP temperature range was achieved at 0.5 wt.% of SNPs. A porous type texture was also observed during the BP formation process in the doped samples.

scholarly journals Self assembled monolayer of silica nanoparticles with improved order by drop casting

RSC Advances ◽  
2020 ◽  
Vol 10 (31) ◽  
pp. 18339-18347
Author(s):  
Asma Qdemat ◽  
Emmanuel Kentzinger ◽  
Johan Buitenhuis ◽  
Ulrich Rücker ◽  
Marina Ganeva ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silica Nanoparticles ◽  
Small Angle ◽  
Grazing Incidence ◽  
Small Angle Scattering ◽  
Large Area ◽  
Self Assembled Monolayer ◽  
Angle Scattering ◽  
Self Assembled

Grazing incidence small angle scattering and electron microscopy have been used to show a large area monolayers with improved order.

Combining surface chemistry modification and in situ small-angle scattering characterization to understand and optimize the biological behavior of nanomedicines

2020 ◽  
Vol 8 (30) ◽  
pp. 6438-6450
Author(s):  
Marine Le Goas ◽  
Tom Roussel ◽  
Maria Kalbazova ◽  
David Carrière ◽  
Elodie Barruet ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Structural Transformation ◽  
Small Angle ◽  
Small Angle Scattering ◽  
Biological Behavior ◽  
Biologically Relevant ◽  
Angle Scattering ◽  
Surface Chemistry Modification

Monitoring structural transformation and quantity of NPs in biologically relevant environments with small-angle scattering techniques.

scholarly journals Improving the rheological properties and thermal stability of water-based drilling fluid using biogenic silica nanoparticles

2021 ◽  
Vol 7 ◽  
pp. 6162-6171
Author(s):  
Mojtaba Mirzaasadi ◽  
Vahid Zarei ◽  
Marischa Elveny ◽  
S.M. Alizadeh ◽  
Vali Alizadeh ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Silica Nanoparticles ◽  
Rheological Properties ◽  
Biogenic Silica ◽  
Drilling Fluid ◽  
Water Based ◽  
Stability Of Water ◽  
Thermal Stability Of
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