Rotatoelectricity in cholesteric side-chain liquid single crystal elastomers

2006 ◽  
Vol 125 (19) ◽  
pp. 194704 ◽  
Author(s):  
Andreas M. Menzel ◽  
Helmut R. Brand
Keyword(s):  
Single Crystal ◽  
Side Chain

An irreversible phase transition in 1-n-butylindeno[2,1-c]pyran-3,9-dione

2012 ◽  
Vol 68 (10) ◽  
pp. o413-o416 ◽  
Author(s):  
Andrei S. Batsanov ◽  
Judith A. K. Howard ◽  
Na Wu ◽  
Zhen Yang ◽  
Todd B. Marder
Keyword(s):  
Phase Transition ◽  
Ambient Temperature ◽  
Single Crystal ◽  
Title Compound ◽  
Room Temperature ◽  
Side Chain ◽  
Compound C ◽  
Planar Conformation ◽  
Triclinic Phase ◽  
Out Of Plane

At ambient temperature, the title compound, C16H14O3, is triclinic, with then-butyl side chain disordered in an out-of-plane orientation. On cooling below 240 K, it converts into a different triclinic phase with an ordered planar conformation and denser packing, which is retained on warming to room temperature. The transition (occasionally) proceeds from single crystal to single crystal.

Effect of co-monomers' relative concentration on self-assembling behaviour of side-chain liquid crystalline elastomers

RSC Advances ◽  
2014 ◽  
Vol 4 (83) ◽  
pp. 44056-44064 ◽  
Author(s):  
Valentina Domenici ◽  
Jerneja Milavec ◽  
Alexej Bubnov ◽  
Damian Pociecha ◽  
Blaž Zupančič ◽  
...  
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Liquid Crystalline ◽  
Relative Concentration ◽  
Side Chain ◽  
Self Assembling

A new series of liquid single crystal elastomers having a nematic–SmA and a direct isotropic–SmA phase transition.

Mycalone: a New Steroidal Lactone From a Southern Australian Marine Sponge, Mycale sp.

1996 ◽  
Vol 49 (6) ◽  
pp. 715 ◽  
Author(s):  
SJ Rochfort ◽  
RW Gable ◽  
RJ Capon
Keyword(s):  
Single Crystal ◽  
Marine Sponge ◽  
Structure Determination ◽  
Spectroscopic Analysis ◽  
Side Chain ◽  
X Ray ◽  
Steroidal Lactone

Mycalone (1), a new steroid incorporating a novel six- membered lactone side chain, has been isolated fram a southern Australian marine sponge, Mycale sp. The gross structure for mycalone (1) was secured by spectroscopic analysis, and the stereochemistry established by a single-crystal X-ray structure determination.

Revised Absolute Configurations of Latifolic Acid and the Pyrrolizidine Alkaloid Latifoline

1988 ◽  
Vol 41 (11) ◽  
pp. 1781 ◽  
Author(s):  
JN Roitman ◽  
RY Wong
Keyword(s):  
Carboxylic Acid ◽  
Single Crystal ◽  
Pyrrolizidine Alkaloid ◽  
Crystallographic Analysis ◽  
Side Chain ◽  
X Ray ◽  
The Absolute ◽  
Absolute Stereochemistry

The absolute stereochemistry of (+)- latifolk acid has been determined by single-crystal X-ray crystallographic analysis to be (2S,3R,4R)-3- hydroxy-2,4-dimethyl-5-oxotetrahydrofuran-3-carboxylic acid. The configuration of the three chiral centres is opposite to that presently recorded in the literature. Accordingly, the configuration of the pyrrolizidine alkaloid, latifoline, which includes a latifolic acid side chain, must be revised.

Interplay between nematic ordering and thermomechanical response in a side-chain liquid single crystal elastomer containing pendant azomesogen units

Polymer ◽  
2009 ◽  
Vol 50 (20) ◽  
pp. 4837-4844 ◽  
Author(s):  
Valentina Domenici ◽  
Gabriela Ambrožič ◽  
Martin Čopič ◽  
Andrija Lebar ◽  
Irena Drevenšek-Olenik ◽  
...  
Keyword(s):  
Single Crystal ◽  
Side Chain ◽  
Thermomechanical Response ◽  
Nematic Ordering

Infra-red dichroism and chain orientation in crystalline ribonuclease

1952 ◽  
Vol 211 (1107) ◽  
pp. 490-499 ◽  
Keyword(s):  
Single Crystal ◽  
Diffraction Pattern ◽  
Side Chain ◽  
Side Chains ◽  
X Ray Diffraction ◽  
Chain Orientation ◽  
X Ray ◽  
Infra Red ◽  
Oriented Parallel ◽  
Polypeptide Chains

Dichroism has been observed in the infra-red spectrum of a single crystal of ribonuclease. The dichroism suggests that the crystal contains folded polypeptide chains whose direction is mainly along or near that of the c axis, in agreement with conclusions arrived at by Carlisle & Scouloudi from consideration of the X-ray diffraction pattern. A band ascribed to the N—H vibration of the amide groups in the side chains has been found to be dichroic, and this appears to show that the plane of the NH 2 group in the side chain amides is oriented parallel to the b axis of the crystal.

A Preparation of High Resolution Standards for Electron Microscopy. Part II

1971 ◽  
Vol 29 ◽  
pp. 160-161
Author(s):  
Akira Tanaka ◽  
David F. Harling
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Carbon Black ◽  
Single Crystal ◽  
Dark Field ◽  
Graphitized Carbon Black ◽  
Graphitized Carbon ◽  
Dark Field Imaging ◽  
Crystal Films ◽  
Micro Holes

In the previous paper, the author reported on a technique for preparing vapor-deposited single crystal films as high resolution standards for electron microscopy. The present paper is intended to describe the preparation of several high resolution standards for dark field microscopy and also to mention some results obtained from these studies. Three preparations were used initially: 1.) Graphitized carbon black, 2.) Epitaxially grown particles of different metals prepared by vapor deposition, and 3.) Particles grown epitaxially on the edge of micro-holes formed in a gold single crystal film.The authors successfully obtained dark field micrographs demonstrating the 3.4Å lattice spacing of graphitized carbon black and the Au single crystal (111) lattice of 2.35Å. The latter spacing is especially suitable for dark field imaging because of its preparation, as in 3.), above. After the deposited film of Au (001) orientation is prepared at 400°C the substrate temperature is raised, resulting in the formation of many square micro-holes caused by partial evaporation of the Au film.

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