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.

scholarly journals CO2 in Lyotropic Liquid Crystals: Phase Equilibria Behavior and Rheology

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 309 ◽  
Author(s):  
Sandra Rodríguez-Fabià ◽  
Jens Norrman ◽  
Hanna K. Knuutila ◽  
Johan Sjöblom ◽  
Kristofer Paso
Keyword(s):  
Ethylene Oxide ◽  
Carbon Capture ◽  
Liquid Crystalline ◽  
Hexagonal Phase ◽  
Carbon Capture And Storage ◽  
Lyotropic Liquid Crystals ◽  
Co2 Absorption ◽  
Co2 Partial Pressure ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

The CO2 absorption of liquid crystalline phases of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (Pluronic L92, (EO)8(PO)47(EO)8), monoethanolamine (MEA), and water, with a composition of 60% L92/10% MEA/30% water has been investigated to assess potential use in carbon capture and storage applications. Vapor–liquid equilibrium data of the liquid crystalline system with CO2 was recorded up to a CO2 partial pressure of 6 bar, where a loading of 38.6 g CO2/kg sample was obtained. Moreover, the phase transitions occurring during the loading process were investigated by small angle X-ray scattering (SAXS), presenting a transition from lamellar + hexagonal phase to hexagonal (at 25 °C). In addition, the rheology of samples with varying loadings was also studied, showing that the viscosity increases with increasing CO2-loading until the phase transition to hexagonal phase is completed. Finally, thermal stability experiments were performed, and revealed that L92 does not contribute to MEA degradation.

scholarly journals Colloidal Lyotropic Liquid Crystalline Phases of Two-Dimensional Nanoparticles of Layered Hybrid Organic-Inorganic Metal Halide Perovskites

2021 ◽  
Author(s):  
PEI-XI WANG
Keyword(s):  
Liquid Crystals ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Metal Halide ◽  
Lyotropic Liquid Crystals ◽  
Two Dimensional ◽  
Halide Anion ◽  
Crystalline Phases ◽  
Liquid Crystalline Phases ◽  
Halide Perovskites

Lyotropic liquid crystals are fluids with macroscopic anisotropic structures formed by the self-assembly of nonspherically-symmetric mesogenic molecules or nanoparticles. Here, lyotropic liquid crystalline phases with discotic-nematic orderings were observed in colloidal dispersions of hexagonal-shaped nanoplatelets of two-dimensional layered hybrid organic-inorganic metal halide perovskites (with formula A<sub>2</sub>BX<sub>4</sub> where A<sup>1+</sup> is an organic ammonium cation, B<sup>2+</sup> is a divalent metal cation, and X<sup>1-</sup> is a halide anion) synthesized via microcrystallization by mixing precursor solutions with antisolvents containing surfactants, which showed semiconducting properties such as blue to green photoluminescence. As nanocrystalline perovskites are compositionally (transition metals like manganese, copper or europium as octahedral unit centers, mixed halides, organic spacers with chirality, etc.), microscopic structurally (three-, two-, or one-dimensional), and geometrically (nanosheets or nanorods) adjustable, liquid crystals with different phase behaviors and physical features (e.g., paramagnetism) may be systematically developed using this method.<br>

scholarly journals Colloidal Lyotropic Liquid Crystalline Phases of Two-Dimensional Nanoparticles of Layered Hybrid Organic-Inorganic Metal Halide Perovskites

2021 ◽  
Author(s):  
PEI-XI WANG
Keyword(s):  
Liquid Crystals ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Metal Halide ◽  
Lyotropic Liquid Crystals ◽  
Two Dimensional ◽  
Halide Anion ◽  
Crystalline Phases ◽  
Liquid Crystalline Phases ◽  
Halide Perovskites

Lyotropic liquid crystals are fluids with macroscopic anisotropic structures formed by the self-assembly of nonspherically-symmetric mesogenic molecules or nanoparticles. Here, lyotropic liquid crystalline phases with discotic-nematic orderings were observed in colloidal dispersions of hexagonal-shaped nanoplatelets of two-dimensional layered hybrid organic-inorganic metal halide perovskites (with formula A<sub>2</sub>BX<sub>4</sub> where A<sup>1+</sup> is an organic ammonium cation, B<sup>2+</sup> is a divalent metal cation, and X<sup>1-</sup> is a halide anion) synthesized via microcrystallization by mixing precursor solutions with antisolvents containing surfactants, which showed semiconducting properties such as blue to green photoluminescence. As nanocrystalline perovskites are compositionally (transition metals like manganese, copper or europium as octahedral unit centers, mixed halides, organic spacers with chirality, etc.), microscopic structurally (three-, two-, or one-dimensional), and geometrically (nanosheets or nanorods) adjustable, liquid crystals with different phase behaviors and physical features (e.g., paramagnetism) may be systematically developed using this method.<br>

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 Y-shaped tricatenar azobenzenes – functional liquid crystals with synclinic–anticlinic transitions and spontaneous helix formation

2020 ◽  
Vol 8 (37) ◽  
pp. 12902-12916 ◽  
Author(s):  
Mohamed Alaasar ◽  
Silvio Poppe ◽  
Yu Cao ◽  
Changlong Chen ◽  
Feng Liu ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Mirror Symmetry ◽  
Liquid Crystalline ◽  
Crystalline Phases ◽  
Helix Formation ◽  
Liquid Crystalline Phases ◽  
Bicontinuous Cubic

The photoisomerizable functional azobenzene unit is organized in synclinic hexatic, anticlinic smectic and bicontinuous cubic liquid crystalline phases as well as in achiral or mirror symmetry broken isotropic network liquids.

scholarly journals The Effects of Size and Shape Dispersity on the Phase Behavior of Nanomesogen Lyotropic Liquid Crystals

Crystals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 715
Author(s):  
Fatima Hamade ◽  
Sadat Kamal Amit ◽  
Mackenzie B. Woods ◽  
Virginia A. Davis
Keyword(s):  
Phase Behavior ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Lyotropic Liquid Crystals ◽  
Crystalline Phases ◽  
Size And Shape ◽  
Liquid Crystalline Phases ◽  
Complex Architectures ◽  
Anisotropic Nanomaterials ◽  
New Applications

Self-assembly of anisotropic nanomaterials into fluids is a key step in producing bulk, solid materials with controlled architecture and properties. In particular, the ordering of anisotropic nanomaterials in lyotropic liquid crystalline phases facilitates the production of films, fibers, and devices with anisotropic mechanical, thermal, electrical, and photonic properties. While often considered a new area of research, experimental and theoretical studies of nanoscale mesogens date back to the 1920s. Through modern computational, synthesis, and characterization tools, there are new opportunities to design liquid crystalline phases to achieve complex architectures and enable new applications in opto-electronics, multifunctional textiles, and conductive films. This review article provides a brief review of the liquid crystal phase behavior of one dimensional nanocylinders and two dimensional nanoplatelets, a discussion of investigations on the effects of size and shape dispersity on phase behavior, and outlook for exploiting size and shape dispersity in designing materials with controlled architectures.

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