Ion electrolytic flexible composite from poly(ethylene oxide) and E8 nematic liquid crystals

2019 ◽  
Author(s):  
Georgi B. Hadjichristov ◽  
Yordan G. Marinov ◽  
Alexander G. Petrov ◽  
Hari Krishna Koduru ◽  
Nicola Scaramuzza
Keyword(s):  
Liquid Crystals ◽  
Ethylene Oxide ◽  
Nematic Liquid Crystals ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

scholarly journals Ion-Conducting Flexible Thin Films of Composites from Poly(ethylene oxide) and Nematic Liquid Crystals E8—Characterization by Impedance and Dielectric Relaxation Spectroscopy

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4465
Author(s):  
Georgi B. Hadjichristov ◽  
Todor E. Vlakhov ◽  
Yordan G. Marinov ◽  
Nicola Scaramuzza
Keyword(s):  
Thin Films ◽  
Liquid Crystals ◽  
Ethylene Oxide ◽  
Dielectric Relaxation ◽  
Electrical Impedance ◽  
Nematic Liquid Crystals ◽  
Molecular Organization ◽  
Poly Ethylene Oxide ◽  
Ion Conducting ◽  
Poly Ethylene

Complex electrical impedance and dielectric spectroscopy were applied to study the dielectric relaxations and their thermal behavior in ion-conducting composites/complexes from polymer poly(ethylene oxide) (PEO) and E8 nematic liquid crystals (LCs), at the compositional ratio PEO:E8 = 70:30 wt%. Flexible thin films of PEO/E8 with a thickness of 150 μm were inspected, as well as such films from Na+ ion-conducting electrolyte PEO/E8/NaIO4 with the same PEO:E8 compositional ratio, but additionally containing 10 wt.% from the salt sodium metaperiodate (NaIO4) as a dopant of Na+ ions. The molecular dynamics, namely the dielectric relaxation of PEO/E8 and PEO/E8/NaIO4, were characterized through analyses of complex impedance and dielectric spectra measured in the frequency range of 1 Hz–1 MHz, under variation of temperature from below to above the glass-transition temperature of these composites. The relaxation and polarization of dipole formations in PEO/E8 and PEO/E8/NaIO4 were evidenced and compared in terms of both electrical impedance and dielectric response depending on temperature. The results obtained for molecular organization, molecular relaxation dynamics, and electric polarization in the studied ion-conducting polymer/LC composites/complexes can be helpful in the optimization of their structure and performance, and are attractive for applications in flexible organic electronics, energy storage devices, and mechatronics.

Polymer functionalized nanoparticles in liquid crystals: combining PDLCs with LC nanocomposites

Soft Matter ◽  
2018 ◽  
Vol 14 (42) ◽  
pp. 8580-8589
Author(s):  
Safiya Allie ◽  
Ignacio Hegoburu ◽  
Min Jeong Shin ◽  
Jung Young Jung ◽  
Violeta Toader ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Liquid Crystals ◽  
Ethylene Oxide ◽  
Phase Behaviour ◽  
Functionalized Nanoparticles ◽  
Functionalized Gold Nanoparticles ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Phase behaviour of poly(ethylene oxide) (PEO) and PEO functionalized gold nanoparticles blended with 5CB is characterized and thermodynamically modelled.

Controlled Synthesis of Zinc Selenide Nanostructures using Oil-Water-Amphiphilic Block Copolymer Liquid Crystals

2006 ◽  
Vol 942 ◽  
Author(s):  
Georgios N. Karanikolos ◽  
Paschalis Alexandridis ◽  
T. J. Mountziaris
Keyword(s):  
Liquid Crystals ◽  
Block Copolymer ◽  
Ethylene Oxide ◽  
Quantum Wells ◽  
Shape Control ◽  
Lyotropic Liquid Crystals ◽  
Free Standing ◽  
Irreversible Reaction ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

ABSTRACTA technique for simultaneous size and shape control of compound semiconductor nanostructures using poly (ethylene oxide)-poly (propylene oxide)-poly (ethylene oxide) block copolymer/water/p-xylene lyotropic liquid crystals as templates is reported. Luminescent quantum dots of ZnSe were grown in the spherical domains of reverse (water-in-oil) cubic liquid crystals, hollow nanospheres and hollow nanotubes were grown around the dispersed spherical and cylindrical oil domains of the normal (oil-in-water) cubic and hexagonal phases respectively, and free-standing quantum wells (nanoplates or nanolaminates) were grown in the lamellar liquid crystals. The ZnSe nuclei were formed at room temperature by a spontaneous and irreversible reaction between zinc acetate that was dissolved in the water phase, and hydrogen selenide that was allowed to diffuse into the liquid crystalline templates. The nanostructures were characterized by HR-TEM, XRD, and optical spectroscopy. The shape of the nanocrystals can be controlled by selecting the structure of the templating phase. The size of the nanocrystals can be controlled by the size of the nanodomains and the concentration of the zinc precursor in them.

scholarly journals CO2 in Lyotropic Liquid Crystals: Monoethanolamine-Facilitated Uptake and Swelling

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 883 ◽  
Author(s):  
Sandra Rodríguez-Fabià ◽  
Jens Norrman ◽  
Johan Sjöblom ◽  
Kristofer Paso
Keyword(s):  
Liquid Crystals ◽  
Ethylene Oxide ◽  
Liquid Crystalline ◽  
Carbon Capture And Storage ◽  
Phase Region ◽  
Lyotropic Liquid Crystals ◽  
Crystalline Phases ◽  
Liquid Crystalline Phases ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Ternary systems consisting of amphiphilic block copolymers/water/monoethanolamine (MEA) have been studied as potential solvents for carbon capture and storage (CCS). The phase behavior of two poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) copolymers with average compositions (EO)8(PO)47(EO)8 (L92) and (EO)3(PO)50(EO)3 (L81) have been investigated by cross-polarized visual observation and small angle X-ray scattering (SAXS). The respective ternary phase diagrams have been studied for systems containing MEA and the equivalent systems containing CO2-loaded MEA. The presence of MEA loaded with CO2 hinders self-association, preventing the formation of liquid crystalline phases. One-phase liquid crystalline regions were found at low MEA concentrations (below 20 wt %) in L92. In the case of L81, only one one-phase region consisting of coexisting lamellar and disordered aggregates was found at 5 wt % MEA. The swelling of the liquid crystalline phases with MEA was investigated along designated dilution lines. The lattice parameters of L92 liquid crystals decrease upon addition of MEA, whereas L81 aggregates show the opposite behavior.

The Structure of Radiation Cross-Linked Poly (ethylene oxide) Gels

1971 ◽  
Vol 29 ◽  
pp. 76-77
Author(s):  
C. E. Cluthe ◽  
G. G. Cocks
Keyword(s):  
Molecular Weight ◽  
Ethylene Oxide ◽  
Parallel Plate ◽  
Average Molecular Weight ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Nitrogen Gas ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Initial Viscosity

Aqueous solutions of a 1 weight-per cent poly (ethylene oxide) (PEO) were degassed under vacuum, transferred to a parallel plate viscometer under a nitrogen gas blanket, and exposed to Co60 gamma radiation. The Co60 source was rated at 4000 curies, and the dose ratewas 3.8x105 rads/hr. The poly (ethylene oxide) employed in the irradiations had an initial viscosity average molecular weight of 2.1 x 106.The solutions were gelled by a free radical reaction with dosages ranging from 5x104 rads to 4.8x106 rads.

Preparation of Organized Mesoporous Silica from Sodium Metasilicate Solutions in Alkaline Medium Using Nonionic Surfactants

2003 ◽  
Vol 68 (10) ◽  
pp. 2019-2031 ◽  
Author(s):  
Markéta Zukalová ◽  
Jiří Rathouský ◽  
Arnošt Zukal
Keyword(s):  
Mesoporous Silica ◽  
Ethylene Oxide ◽  
Sodium Metasilicate ◽  
Spherical Particles ◽  
Structure Directing Agent ◽  
Inorganic Species ◽  
Poly Ethylene Oxide ◽  
Acidic Conditions ◽  
Poly Ethylene ◽  
Hydrolysis Of

A new procedure has been developed, which is based on homogeneous precipitation of organized mesoporous silica from an aqueous solution of sodium metasilicate and a nonionic poly(ethylene oxide) surfactant serving as a structure-directing agent. The decrease in pH, which induces the polycondensation of silica, is achieved by hydrolysis of ethyl acetate. Owing to the complexation of Na+ cations by poly(ethylene oxide) segments, assembling of the mesostructure appears to occur under electrostatic control by the S0Na+I- pathway, where S0 and I- are surfactant and inorganic species, respectively. As the complexation of Na+ cations causes extended conformation of poly(ethylene oxide) segments, the pore size and pore volume of organized mesoporous silica increase in comparison with materials prepared under neutral or acidic conditions. The assembling of particles can be fully separated from their solidification, which results in the formation of highly regular spherical particles of mesoporous silica.

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