Self-Assembly Optical Components

2003 ◽  
Vol 771 ◽  
Author(s):  
Pavel I. Lazarev ◽  
Michael V. Paukshto ◽  
Elena N. Sidorenko
Keyword(s):  
Optical Properties ◽  
Self Assembly ◽  
Crystalline State ◽  
Liquid Crystalline ◽  
Film Deposition ◽  
X Ray Diffraction ◽  
Optical Components ◽  
Crystal Film ◽  
Solid Film ◽  
Thin Crystal

AbstractWe report a new method of Thin Crystal Film deposition. In the present paper we describe the method of crystallization, structure, and optical properties of Bisbenzimidazo[2,1-a:1',2',b']anthra[2,1,9-def:6,5,10-d'e'f']-diisoquinoline-6,9-dion (mixture with cis-isomer) (abbreviated DBI PTCA) sulfonation product. The Thin Crystal Film has a thickness of 200-1000 nm, with anisotropic optical properties such as refraction and absorption indices. X-ray diffraction data evidences a lyotropic liquid crystalline state in liquid phase and crystalline state in solid film. Anisotropic optical properties of the film make it useful in optical devices, e.g. liquid crystal displays.

X-ray diffraction evidence for decreased lipid fluidity in senescent membranes from cotyledons

1976 ◽  
Vol 54 (10) ◽  
pp. 1074-1078 ◽  
Author(s):  
B. D. McKersie ◽  
J. E. Thompson ◽  
J. K. Brandon
Keyword(s):  
Crystalline State ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
Membrane Function ◽  
X Ray ◽  
Hydrocarbon Chains ◽  
Sharp Band ◽  
Microsomal Membranes ◽  
Diffraction Patterns

Smooth microsomal membranes were isolated from bean cotyledons at various intervals after planting. Wide-angle x-ray diffraction patterns were recorded at room temperature from oriented specimens of the membranes. Patterns for membranes from 2-day-old cotyledons featured a broad lipid reflection centered about a Bragg spacing of 4.6 Å. This diffraction band derives from the apolar hydrocarbon chains of the membrane phospholipid, and its diffuse nature indicates that these hydrocarbons are in a disordered liquid–crystalline state. By day 4 in the germination sequence a faint sharp band superimposed on the broad lipid reflection was discernable at a Bragg spacing of 4.15 Å. This sharp reflection represents lipid in an ordered, crystalline state and derives from a close hexagonal packing of the hydrocarbon chains. During the later stages of germination the 4.15-Å reflection intensified to the point of becoming very pronounced in patterns for membranes from 9-day-old cotyledons. These patterns also displayed a sharp but weaker reflection at 3.75 Å, which derives from an orthorhombic packing of the hydrocarbon chains in crystalline lipid. By 9 days of age the cotyledons were extensively senescent and beginning to abscise.The data indicate that senescence of membranes involves a phase change whereby the proportion of crystalline to liquid– crystalline lipid progressively increases. This changed physical state of the lipid represents a substantial decrease in membrane fluidity and may well contribute to loss of membrane function in senescing membranes.

scholarly journals Effect of In-Incorporation and Annealing on CuxSe Thin Films

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3810
Author(s):  
Algimantas Ivanauskas ◽  
Remigijus Ivanauskas ◽  
Ingrida Ancutiene
Keyword(s):  
Optical Properties ◽  
Dendritic Structure ◽  
Thin Film Deposition ◽  
Nitrogen Atmosphere ◽  
Copper Selenide ◽  
Film Deposition ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ionic Adsorption ◽  
Selenide Thin Film

A study of indium-incorporated copper selenide thin-film deposition on a glass substrate using the successive ionic adsorption and reaction method (SILAR) and the resulting properties is presented. The films were formed using these steps: selenization in the solution of diseleniumtetrathionate acid, treatment with copper(II/I) ions, incorporation of indium(III), and annealing in an inert nitrogen atmosphere. The elemental and phasal composition, as well as the morphological and optical properties of obtained films were determined. X-ray diffraction data showed a mixture of various compounds: Se, Cu0.87Se, In2Se3, and CuInSe2. The obtained films had a dendritic structure, agglomerated and not well-defined grains, and a film thickness of ~90 μm. The band gap values of copper selenide were 1.28–1.30 eV and increased after indium-incorporation and annealing. The optical properties of the formed films correspond to the optical properties of copper selenide and indium selenide semiconductors.

scholarly journals A periodic dodecagonal supertiling by self-assembly of star-shaped molecules in the liquid crystalline state

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Marco Poppe ◽  
Changlong Chen ◽  
Silvio Poppe ◽  
Feng Liu ◽  
Carsten Tschierske
Keyword(s):  
Self Assembly ◽  
Crystalline State ◽  
Liquid Crystalline ◽  
Liquid Crystalline State

Morphology and Conductivity of Self-Assembled Pyrene-Perylenetetracarboxylic Diimide Dyad

2014 ◽  
Vol 936 ◽  
pp. 911-914
Author(s):  
Yan Shi ◽  
Xi You Li
Keyword(s):  
Self Assembly ◽  
Mass Spectra ◽  
Fluorescence Spectra ◽  
Ambient Light ◽  
X Ray Diffraction ◽  
X Ray ◽  
H Nmr ◽  
Maldi Tof Mass Spectra ◽  
Solid Film ◽  
Xrd Techniques

One perylenetetracarboxylic diimide (PDI) derivatives (PDI 1) linked with pyrene by flexible chain at the bay positions was synthesized and the molecular structure was characterized by 1H NMR, MALDI-TOF mass spectra as well as elemental analysis. The molecular self-assembly were prepared from solution via a slow evaporation of solvent. The properties of these molecular aggregates were studied by electronic absorption and fluorescence spectra. The morphologies and structures were examined by scanning electronic microscopy (SEM) and X-ray diffraction (XRD) techniques. The conducting properties were evaluated by currentvoltage (IV) measurements. The results revealed highly ordered structure for these molecular self-assembly. The thin solid film fabricated from these molecular self-assembly show an electric conductivity as high as 4.85 × 10-4 S cm-1 under the ambient light, which means this compound might be used as a semiconductor in nanoelectronics.

Desymmetrization of 3,3′-Bis(acylamino)-2,2′-bipyridine-Based Discotics: The High Fidelity of Their Self-Assembly Behavior in the Liquid-Crystalline State and in Solution

2010 ◽  
Vol 16 (7) ◽  
pp. 2258-2271 ◽  
Author(s):  
Michel H. C. J. van Houtem ◽  
Rafael Martín-Rapún ◽  
Jef A. J. M. Vekemans ◽  
E. W. Meijer
Keyword(s):  
Self Assembly ◽  
Crystalline State ◽  
Liquid Crystalline ◽  
High Fidelity ◽  
Liquid Crystalline State ◽  
Assembly Behavior

Thermally stable iridescent colors of a new low-molecular-weight cholesteric compound in the solid state and the application to fullcolor recording

1997 ◽  
Vol 488 ◽  
Author(s):  
Nobuyuki Tamaoki ◽  
Alexander V. Parfenov ◽  
Atsushi Masaki ◽  
Hiro Matsuda
Keyword(s):  
Liquid Crystalline ◽  
Phase Measurement ◽  
Optical Rotation ◽  
Visible Region ◽  
X Ray Diffraction ◽  
Cooling Process ◽  
Rapid Cooling ◽  
Solid Films ◽  
Solid Film ◽  
Rotation Dispersion

AbstractWe synthesized a series of new di-cholesteryl esters of several diacids. One of the compounds containing both of a diyne unit and long alkylene units, in the form of a thin solid film, showed stable iridescent colours in the visible region after rapid cooling process from the temperature of the cholesteric liquid crystalline phase. Measurement of selective reflectance of visible light, X-ray diffraction, optical rotation dispersion of the solid films proved that the films remained the cholesteric ordering of the molecules. The cholesteric structure in the solid films were completely stable at room temperature. The colour of the solid film was totally, partially or in imagewise manner changed into selected colours by adjusting the temperature of the surface just before the rapid cooling process. The property of this compound can be applicable to memory media with high density using the spectrum of light, or to thermosensitive full-colour recording materials.

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