ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT"Command surfaces" of Langmuir-Blodgett films. Photoregulations liquid crystal alignment by molecularly tailored surface azobenzene layersTakahiro Seki, Masako Sakuragi, Yuji Kawanishi, Takashi Tamaki, Ryoichi Fukuda, Kunihiro Ichimura, and Yasuzo SuzukiCite this: Langmuir 1993, 9, 1, 211–218Publication Date (Print):January 1993Publication History Published online1 May 2002Published inissue 1 January 1993https://doi.org/10.1021/la00025a041RIGHTS &...

Direct observation of black holes is one the grand challenges in astronomy. If there are supercompact objects which possess unstable circular orbits photons, however, it may be difficult to distinguish them from by observing photons. As a model objects, we consider gravastar (gravitational-vacuum-star) was originally proposed Mazur and Mottola. For definiteness, adopt spherical thin-shell developed Visser Wiltshire, connects interior de Sitter geometry exterior Schwarzschild geometry. We...

Abstract We report the synthesis of block and alternating thiophene/phenylene co‐oligomers that is based either on Suzuki coupling reaction or Grignard reaction. These schemes enable us to obtain target compounds at reasonably high yields. The resulting materials have been fully characterized through solid‐state 13 C nmr Fourier‐transform ir as well 1 H nmr. Of these, are particularly useful in characterizing higher molecular weight, since those difficult dissolve organic solvents.

We construct static and spherically symmetric black hole solutions in the Einstein-Euler-Heisenberg (EEH) system which is considered as an effective action of a superstring theory. electrically charged, magnetically charged dyon solutions. can solve analytically for case. find that they have some remarkable properties about causality thermodynamics depending on coupling constant EH theory $a$ $b$, though central singularity Schwarzschild hole.

During blood coagulation alpha 2-plasmin inhibitor (alpha 2PI) is cross-linked with fibrin by an activated fibrin-stabilizing factor (FSFa) plasma transglutaminase, XIII). When 2PI was treated FSFa in the absence of acceptor amino groups, lost more than 90% its capacity to be because hydrolysis gamma-carboxamides FSFa-susceptible glutamine residues. Chemical modifications inhibitor's lysine epsilon-amino groups did not affect cross-linking fibrin, whereas same chemical fibrinogen resulted a...

Nick and Al join forces: The nickel-catalyzed [3+2] cycloaddition between the title compounds gives cyclopentene derivatives in presence of Me2AlCl. organoaluminum reagent activates carbonyl group cyclopropyl ketone through coordination oxygen atom to aluminum, stabilizes reaction intermediate by chloride nickel. cod=1,5-cyclooctadiene, THF=tetrahydrofuran.

Abstract We report the synthesis of phenyl‐capped oligothiophenes via improved synthetic schemes. These schemes are based on Grignard coupling reaction and enable us to obtain target compounds at high yields. The resulting materials have been fully characterized through nmr ir spectroscopies. analysis is particularly useful in characterizing higher molecular weight, since those difficult dissolve organic solvent. also show an improvement preparation halogenated (oligo)thiophenes that used as...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical induction and modulation of nematic homogeneous alignment by the polarization photochromism surface azobenzenesYuji Kawanishi, Takashi Tamaki, Masako Sakuragi, Takahiro Seki, Yasuzo Suzuki, Kunihiro IchimuraCite this: Langmuir 1992, 8, 11, 2601–2604Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November...

Asymmetric dialkyl disulfides with a para-substituted azobenzene (i.e., 4-substituted 4'-(12-(dodecyldithio)dodecyloxy)azobenzenes) produced photoresponsive self-assembled monolayers (SAMs) on gold (111) surfaces. Infrared reflection absorption (IR-RA) spectroscopy and ultraviolet (UV) visible (vis) light gave information the molecular orientational order of adsorbates in SAMs. The photoreactivity was investigated using dynamic contact-angle measurements Wilhelmy-type surface balance....

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFactors affecting photoinduced alignment regulation of cyclohexanecarboxylate-type nematic liquid crystals by azobenzene molecular filmsKoso Aoki, Takahiro Seki, Yasuzo Suzuki, Takashi Tamaki, Akira Hosoki, and Kunihiro IchimuraCite this: Langmuir 1992, 8, 3, 1007–1013Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March...

Cyclopropanecarboxaldehyde (1 a), cyclopropyl methyl ketone b), and phenyl c) were reacted with [Ni(cod)(2)] (cod = 1,5-cyclooctadiene) PBu(3) at 100 degrees C to give eta(2)-enonenickel complexes (2 a-c). In the presence of PCy(3) (Cy cyclohexyl), 1 a b corresponding mu-eta(2):eta(1)-enonenickel (3 a, 3 b). However, reaction c under same conditions gave mixture cyclopentane derivatives (4 c, 4 c'), that is, [3+2] cycloaddition product (E)-1-phenylbut-2-en-1-one, an isomer c. catalytic...

Organolithium reagents are often too unstable to use due being highly reactive. This limits their application in organic synthesis. review highlights our approach various synthetic reactions mediated by organolithium based on flash chemistry conducted flow reactors, especially utilizing space-integration of the reactions. The high reactivity organolithiums renders them use, thereby limiting approaches for Flash

A high-performance micro-patterned polarizing element has successfully been fabricated by in-plane anisotropic alignment of a chromonic lyotropic liquid crystal. Although the fabrication method is quite simple, orientational order obtained high enough for practical usage. The Figure shows microscopy image two crossed elements.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical alignment regulation of a nematic liquid crystal by Langmuir-Blodgett layers azobenzene polymers as "command surfaces"Takahiro Seki, Takashi Tamaki, Yasuzo Suzuki, Yuji Kawanishi, Kunihiro Ichimura, and Koso AokiCite this: Macromolecules 1989, 22, 8, 3505–3506Publication Date (Print):August 1, 1989Publication History Published online1 May 2002Published inissue 1 August...

Abstract Anthracene-1- or 2-sulfonic and 2-carboxylic acids were found to form one host-two guest inclusion complexes with γ-cyclodextrin in aqueous solutions. The complex formation greatly enhanced the photodimerization of these anthracenes.

The characterization of single-molecule structures could provide significant insights into the operation mechanisms functional devices. Structural transformation via isomerization has been extensively employed to implement device functionalities. Although identification recently achieved using near-field spectroscopy, discrimination between isomeric forms remains challenging. Further, structure–function relationship at scale unclear. Herein, we report observation spiropyran in a junction...

We construct static and spherically symmetric particle-like black hole solutions with magnetic or electric charge in the Einstein-Born-Infeld-dilaton system, which is a generalization of Einstein-Maxwell-dilaton (EMD) system Einstein-Born-Infeld (EBI) system. They have remarkable properties are not seen for corresponding EBI EMD

Abstract The effects of intermolecular and intramolecular triplet quenchers sensitizers on the photochromism nitrospiropyran have been examined in order to clarify role state (3A*) as well that excited singlet (1A*). rates photocoloration fatigue were significantly affected: retarded both rates, while former but enhanced latter rate. It can be concluded more than 90% total amount photomerocyanin is generated from 1A* photostationary proceeds mainly through 3A*.

We derive analytic solutions of a chameleon scalar field $\ensuremath{\phi}$ that couples to nonrelativistic matter in the weak gravitational background spherically symmetric body, paying particular attention mass ${m}_{A}$ inside body. The standard thin-shell profile is recovered by taking limit ${m}_{A}{r}_{c}\ensuremath{\rightarrow}\ensuremath{\infty}$, where ${r}_{c}$ radius show existence ``no-shell'' nearly frozen whole interior which does not necessarily correspond ``zero-shell''...

We reconsider spherically symmetric black hole solutions in Einstein-Aether theory with the condition that this has identical parametrized post-Newtonian parameters as those for general relativity, which is main difference from previous research. In contrast study, we allow superluminal propagation of a spin-0 Aether-gravity wave mode. As result, obtain holes having ``horizon'' inside an event horizon. singularity at horizon since it concealed by If such configuration, kinetic term Aether...

We study the field profile of a scalar $\phi$ that couples to matter fluid (dubbed chameleon field) in relativistic gravitational background spherically symmetric spacetime. Employing linear expansion terms potential $\Phi_c$ at surface compact object with constant density, we derive thin-shell both inside and outside object, as well resulting effective coupling matter, analytically. also carry out numerical simulations for class inverse power-law potentials $V(\phi)=M^{4+n} \phi^{-n}$ by...