Self-assembly of amphiphilic fluorescent dyes showing aggregate-induced enhanced emission: temperature dependence of molecular alignment and intermolecular interaction in aqueous environment

2009 ◽  
pp. 5832 ◽  
Author(s):  
Takashi Hirose ◽  
Kenji Matsuda
Keyword(s):  
Temperature Dependence ◽  
Intermolecular Interaction ◽  
Self Assembly ◽  
Fluorescent Dyes ◽  
Molecular Alignment ◽  
Aqueous Environment

scholarly journals Transformation between elastic dipoles, quadrupoles, octupoles, and hexadecapoles driven by surfactant self-assembly in nematic emulsion

2021 ◽  
Vol 7 (25) ◽  
pp. eabg0377
Author(s):  
Bohdan Senyuk ◽  
Ali Mozaffari ◽  
Kevin Crust ◽  
Rui Zhang ◽  
Juan J. de Pablo ◽  
...  
Keyword(s):  
Self Assembly ◽  
Molecular Alignment ◽  
Smart Windows ◽  
Equilibrium Dynamics ◽  
Fundamental Science ◽  
Pair Interactions ◽  
Isotropic Fluid

Emulsions comprising isotropic fluid drops within a nematic host are of interest for applications ranging from biodetection to smart windows, which rely on changes of molecular alignment structures around the drops in response to chemical, thermal, electric, and other stimuli. We show that absorption or desorption of trace amounts of common surfactants can drive continuous transformations of elastic multipoles induced by the droplets within the uniformly aligned nematic host. Out-of-equilibrium dynamics of director structures emerge from a controlled self-assembly or desorption of different surfactants at the drop-nematic interfaces, with ensuing forward and reverse transformations between elastic dipoles, quadrupoles, octupoles, and hexadecapoles. We characterize intertransformations of droplet-induced surface and bulk defects, probe elastic pair interactions, and discuss emergent prospects for fundamental science and applications of the reconfigurable nematic emulsions.

Fabrication of molecular alignment at the specific sites on Cu(111) surfaces using self-assembly phenomena

2000 ◽  
Vol 445 (1) ◽  
pp. L58-L63 ◽  
Author(s):  
Masashi Furukawa ◽  
Hiroyuki Tanaka ◽  
Ken-ichi Sugiura ◽  
Yoshiteru Sakata ◽  
Tomoji Kawai
Keyword(s):  
Self Assembly ◽  
Molecular Alignment

Ferromagnetic Intermolecular Interaction and Crystal Structure of α-Nitronyl Nitroxide

1989 ◽  
Vol 173 ◽  
Author(s):  
Kunio Awaga ◽  
Tamotsu Inabe ◽  
Yusei Maruyama
Keyword(s):  
Crystal Structure ◽  
Temperature Dependence ◽  
Intermolecular Interaction ◽  
Magnetic Coupling ◽  
Two Dimensional ◽  
Nitronyl Nitroxide ◽  
Magnetic Susceptibilities ◽  
X Ray ◽  
Nitronyl Nitroxides ◽  
Coulomb Attraction

ABSTRACTThe temperature dependence of the magnetic susceptibilities for several ±-nitronyl nitroxides have been measured. It is found that the intermolecular magnetic coupling in these radical crystals changes from antiferromagnetic to ferromagnetic depending on the substituents at ±-position. X-Ray crystal analysis and MO calculation have been carried out on the ferromagnetic ±-nitronyl nitroxide, 2-(4-nitrophenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxy 3-oxide, revealing a two-dimensional ferromagnetic network linked by the Nδ+...0δ− Coulomb attraction.

Investigations of New Self-Assembled Multilayer Thin Films Based on Alternately Adsorbed Layers of Polyelectrolytes and Functional Dye Molecules

1995 ◽  
Vol 413 ◽  
Author(s):  
Dongsik Yoo ◽  
Jin-kyu Lee ◽  
M. F. Rubner
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Self Assembly ◽  
Fluorescent Dyes ◽  
Multilayer Thin Films ◽  
Layer By Layer ◽  
Dye Molecules ◽  
Ph Indicator ◽  
Light Emitting ◽  
Thin Film Devices

ABSTRACTThe layer-by-layer self-assembly of a number of different functional dye molecules has been accomplished via the alternate spontaneous adsorption of polyelectrolytes and ionic dyes from dilute solutions. Multilayer thin films containing such functional dyes as pH indicator dyes, infrared absorbing dyes, porphyrin dyes and various fluorescent dyes have been successfully fabricated and their electrical and opt, 2al properties examined. Multilayers containing a newly synthesized ionic ruthenium based polypryidyl dye have been utilized to fabricate light emitting thin film devices with high brightness (ca. 100 cd/m2) at voltages in the range of 5–10 volts. These new light emitting thin film devices exhibit excellent stability when compared to devices based on conjugated polymers such PPV. The fabrication and device evaluation of new heterostructure thin films based on this new light emitting dye as well as the properties of other multilayer thin films containing dye molecules are presented.

scholarly journals Self-assembly of tholins in environments simulating Titan liquidospheres: implications for formation of primitive coacervates on Titan

2013 ◽  
Vol 12 (4) ◽  
pp. 282-291 ◽  
Author(s):  
Jun Kawai ◽  
Seema Jagota ◽  
Takeo Kaneko ◽  
Yumiko Obayashi ◽  
Yoshitaka Yoshimura ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Self Assembly ◽  
Aqueous Ammonia ◽  
Aqueous Environment ◽  
Plasma Discharges ◽  
Atmospheric Gases ◽  
Polar Solvents ◽  
Average Temperature ◽  
Magnetosphere Of Saturn ◽  
Complex Organic

AbstractTitan, the largest satellite of Saturn, has a thick atmosphere containing nitrogen and methane. A variety of organic compounds have been detected in the atmosphere, most likely produced when atmospheric gases are exposed to ultraviolet light, electrons captured by the magnetosphere of Saturn and cosmic rays. The Cassini/Huygens probe showed that the average temperature on the surface of Titan is 93.7 K, with lakes of liquid ethane and methane. Sub-surface mixtures of liquid ammonia and water may also be present. We have synthesized complex organic compounds (tholins) by exposing a mixture of nitrogen and methane to plasma discharges, and investigated their interactions with several different liquids that simulate Titan's liquidosphere. We found that coacervates formed when tholins were extracted in non-polar solvents followed by exposure to aqueous ammonia solutions. The results suggest that coacervates can self-assemble in Titan's liquidosphere which have the potential to undergo further chemical evolution. Similar processes are likely to occur in the early evolution of habitable planets when tholin-like compounds undergo phase separation into microscopic structures dispersed in a suitable aqueous environment.

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