Lyotropic Liquid Crystalline Phases of Anisotropic Nanoparticles of Organic-Inorganic Metal Halide Perovskites: Photoluminescence from Self-Assembled Ordered Microstructures of Semiconductors

2021 ◽  
Author(s):  
Pei-Xi Wang
Keyword(s):  
Liquid Crystalline ◽  
Metal Halide ◽  
Simple Method ◽  
Crystalline Phases ◽  
Anisotropic Nanoparticles ◽  
Liquid Crystalline Phases ◽  
Halide Perovskites ◽  
Self Assembled ◽  
Ordered Microstructures

A simple method (could be completed within 60 minutes at 298 K) was developed to transform layered organic-inorganic metal halide perovskites into colloidal lyotropic liquid crystalline dispersions with microscopic structural...

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>

scholarly journals Liquid crystalline behaviour of self-assembled LAPONITE®/PLL–PEG nanocomposites

Soft Matter ◽  
2018 ◽  
Vol 14 (15) ◽  
pp. 2782-2788 ◽  
Author(s):  
P. Xu ◽  
Y. Lan ◽  
Z. Xing ◽  
E. Eiser
Keyword(s):  
Liquid Crystalline ◽  
Crystalline Phases ◽  
Liquid Crystalline Phases ◽  
Self Assembled

By coating the flat faces of LAPONITE® disks with the comb-like polymer PLL–PEG we can fully suppress their aging in water and access their liquid-crystalline phases.

Liquid Crystalline Phases in N-(4-n-alkylbenzylidene)-4′-n-alkylanilines

1976 ◽  
Vol 31 (7) ◽  
pp. 786-792 ◽  
Author(s):  
Jürgen Nehring ◽  
Maged A. Osman
Keyword(s):  
Low Temperatures ◽  
Liquid Crystalline ◽  
Transition Temperatures ◽  
Simple Method ◽  
Crystalline Phases ◽  
Density Measurements ◽  
Liquid Crystalline Phases

Abstract The mesomorphic behavior of N-(4-n-alkylbenzylidene)-4′-n-alkylanilines is investigated and nematic as well as smectic-B phases are found at comparatively low temperatures. Long aliphatic substituents on the aldehyde side of the molecule favor the smectic-B phase. Observations on smectic-B textures, transition enthalpies and density measurements are reported. The simple method used to determine transition temperatures despite impure samples can also be applied to other compounds, e. g. yielding 21.6 - 47.5 °C for the nematic range of MBBA.

Influence of Internal Structure and Composition of Liquid Crystalline Phases on Topical Delivery of Paclitaxel

2011 ◽  
Vol 100 (4) ◽  
pp. 1444-1455 ◽  
Author(s):  
Jaclyn M. Hosmer ◽  
Soo H. Shin ◽  
Adwoa Nornoo ◽  
Haian Zheng ◽  
Luciana B. Lopes
Keyword(s):  
Internal Structure ◽  
Liquid Crystalline ◽  
Topical Delivery ◽  
Crystalline Phases ◽  
Liquid Crystalline Phases
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