scholarly journals Fabrication Of Colloidal Clusters Decorated With Dye Molecules For Potential Application As Photonic Molecules

2015 ◽  
Vol 60 (2) ◽  
pp. 1221-1225
Author(s):  
Y.-S. Cho
Keyword(s):  
Self Assembly ◽  
Fluorescent Dyes ◽  
Sol Gel ◽  
Dye Molecules ◽  
Silica Microspheres ◽  
Stöber Method ◽  
Emulsion Droplets ◽  
Colloidal Clusters ◽  
Oil In Water ◽  
Photonic Molecules

AbstractIn this study, colloidal clusters decorated with fluorescent dyes were fabricated by evaporation-driven self-assembly using emulsion droplets as confining geometries. Silica microspheres were synthesized by Stober method followed by the modification with dye molecules through additional surface sol-gel reaction for the formation of thin silica shell. The surface of the resultant dye-doped silica microspheres was modified with hydrophobic silane coupling agent to disperse the particle suspension in organic solvent such as hexane. The fluorescent silica microspheres were self-assembled inside oil-in-water emulsions by evaporation-driven self-assembly for the formation of colloidal clusters, potentially applicable for photonic molecules. The clusters with fluorescent emission were observed using confocal microscope.

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.

Compressible colloidal clusters from Pickering emulsions and their DNA functionalization

2018 ◽  
Vol 54 (60) ◽  
pp. 8328-8331 ◽  
Author(s):  
In-Seong Jo ◽  
Joon Suk Oh ◽  
Shin-Hyun Kim ◽  
David J. Pine ◽  
Gi-Ra Yi
Keyword(s):  
Pickering Emulsions ◽  
Polymer Particles ◽  
Water Emulsion ◽  
Crosslinked Polymer ◽  
Emulsion Droplets ◽  
Colloidal Clusters ◽  
Oil In Water ◽  
Oil In Water Emulsion ◽  
Dna Functionalization

Colloidal clusters were prepared by assembling azide-functionalized non-crosslinked polymer particles using fluorinated oil-in-water emulsion droplets.

scholarly journals Preparation and characterization of quercetin-loaded silica microspheres stabilized by combined multiple emulsion and sol-gel processes

2015 ◽  
Vol 21 (1-1) ◽  
pp. 85-94 ◽  
Author(s):  
Young Kim ◽  
Dong Lee ◽  
Eun Jung ◽  
Jun Bae ◽  
Sang Lee ◽  
...  
Keyword(s):  
Wide Spectrum ◽  
Sol Gel ◽  
Solvent System ◽  
Silica Microspheres ◽  
Oil In Water ◽  
Phase Medium ◽  
Novel Method ◽  
Outer Water ◽  
Gel Processing

Despite exhibiting a wide spectrum of cosmeceutical properties, flavonoids and related compounds have some limitations related to their stability and solubility in distilledwater. In this project, we prepared silica microspheres using a novel method that uses polyol-in-oil-in-water (P/O/W) emulsion and sol-gel methods as techniques for stabilizing quercetin. A stable microsphere suspension was successfully preparedusing a mixed solvent system comprising a polyol-phase medium for performing the sol-gel processing of tetraethyl orthosilicate (TEOS) as an inorganic precursor with outer water phase. The morphology of the microsphere was evaluated using a scanning electron microscope (SEM), which showed a characteristic spherical particle shape with a smooth surface. Furthermore, SEM/EDSanalysis of a representative microsphere demonstrated that the inner structure of the silica microspheres was filled with quercetin. The mean diameter of the microsphere was in the range 20.6-35.0 ?m, and the encapsulation efficiency ranged from 17.8% to 27.5%. The free and encapsulated quercetin samples were incubated in separateaqueous solutions at 25 and 42?C for 28 days. The residualcontent of the quercetin encapsulated by silica microspheres was 82% at 42?C. In contrast, that of the free quercetin stored at 42?C decreased to ~24%.

scholarly journals Specific and reversible DNA-directed self-assembly of oil-in-water emulsion droplets

2012 ◽  
Vol 109 (50) ◽  
pp. 20320-20325 ◽  
Author(s):  
M. Hadorn ◽  
E. Boenzli ◽  
K. T. Sorensen ◽  
H. Fellermann ◽  
P. Eggenberger Hotz ◽  
...  
Keyword(s):  
Self Assembly ◽  
Water Emulsion ◽  
Emulsion Droplets ◽  
Oil In Water ◽  
Oil In Water Emulsion

Electrophoretic Self-Assembly of Sol-Gel Derived Silica Microspheres

2007 ◽  
Vol 124-126 ◽  
pp. 599-602 ◽  
Author(s):  
Rong Fuh Louh ◽  
Eric Huang
Keyword(s):  
Photonic Crystals ◽  
Self Assembly ◽  
Sol Gel ◽  
Tetraethyl Orthosilicate ◽  
Silica Microspheres ◽  
Sol Gel Process ◽  
Layered Pattern ◽  
Fcc Structure

Monosized silica microspheres (100−500 nm) were prepared by a sol-gel process by using tetraethyl orthosilicate precursor. A well-dispersed suspension was obtained by adjusting suspension to be weakly basic for a better yield of electrophoretic self-assembly (EPSA). A perfect EPSA behavior of silica microspheres into the layered pattern with the FCC structure was created. EPSA technique has been demonstrated as a simple and effective route to make numerous templates, which are associated with 3-D structures of silica microspheres in asymmetric geometries, for design of photonic crystals.

Enhanced Electroluminescence of Urethane Containing Processable Polythiophene Derivative by Addition of Dye Molecules

2000 ◽  
Vol 660 ◽  
Author(s):  
Amarjeet Kaur ◽  
Mario J. Cazeca ◽  
Kethinni G. Chittibabu ◽  
Jayant Kumar ◽  
Sukant K. Tripathy
Keyword(s):  
Fluorescent Dyes ◽  
Visible Region ◽  
Dye Molecules ◽  
Flat Panel Display ◽  
Large Area ◽  
Good Efficiency ◽  
Display Devices ◽  
Yellow Color ◽  
Organic Electroluminescent ◽  
Important Approach

ABSTRACTOrganic electroluminescent (EL) diodes based on fluorescent dyes and conducting polymers have attracted the interest of researchers, mainly because of their emission in the visible region and for application to large area portable flat panel display devices, driven at low voltages. Therefore, for the development of higher efficiency polymer EL diodes, the optimal combination of the merits of organic fluorescent dye molecules with that of conjugated polymer is an important approach. We report electroluminescence studies of polymer light emitting diodes (p-LEDs) fabricated with poly[2-(3-thienyl)ethanol n-butoxy carbonylmethyl urethane] (PURET) and its composite with 4-dicyanomethylene-2-methyl-6-(p-dimethylaminostyryl)-4H pyran (DCM) dye. These materials have been chosen in view of the fact that PURET exhibits a small overlap between emission and absorption spectra whereas DCM has a good efficiency of trapping both electrons as well as holes. Polyaniline has been utilized as hole injecting layer whereas tris-8-hydroxyquinoline-aluminum as electron injecting layer. Enhanced electroluminescence with bright yellow color has been observed in p-LEDs by the addition of dye.

Sol–gel synthesis of 2-dimensional TiO2: self-assembly of Ti–oxoalkoxy–acetate complexes by carboxylate ligand directed condensation

2021 ◽  
Author(s):  
Ruohong Sui ◽  
Connor E. Deering ◽  
Rohen Prinsloo ◽  
Christopher B. Lavery ◽  
Nancy Chou ◽  
...  
Keyword(s):  
Self Assembly ◽  
Sol Gel ◽  
Carboxylate Ligand ◽  
Sol Gel Synthesis ◽  
First Time

2-Dimensional TiO2 is synthesized for the first time by a sol–gel self-assembly of Ti–oxoalkoxy–acetate complexes.

Direct Observation of Splitting in Oil-In-Water-In-Oil Emulsion Droplets via a Microchannel Mimicking Membrane Pores

Langmuir ◽  
2017 ◽  
Vol 33 (49) ◽  
pp. 14087-14092 ◽  
Author(s):  
Kazuki Akamatsu ◽  
Koki Minezaki ◽  
Masumi Yamada ◽  
Minoru Seki ◽  
Shin-ichi Nakao
Keyword(s):  
Direct Observation ◽  
Oil Emulsion ◽  
Membrane Pores ◽  
Emulsion Droplets ◽  
Oil In Water ◽  
Water In Oil Emulsion

Development of temporal spectroscopic properties for Xerogel matrices doped with Rhodamine 6G dye

Open Physics ◽  
2006 ◽  
Vol 4 (3) ◽  
Author(s):  
Abbas Al-Wattar ◽  
Baha Chiad ◽  
Wesam Twej ◽  
Sarmed Al-Awadi
Keyword(s):  
Fluorescence Spectra ◽  
Rhodamine 6G ◽  
Sol Gel ◽  
Blue Shift ◽  
Spectroscopic Properties ◽  
Dye Molecules ◽  
Absorption And Fluorescence Spectra ◽  
Silica Network ◽  
Sol Gel Process ◽  
Two Parameters

AbstractThe solid host of a laser dye modifies its spectroscopic properties with respect to its liquid host. During the Sol-Gel process the dye molecules suffer from changing their environment. Two parameters affect this matter, the change in the concentration due to the evaporation of the solvent (drying) and the caging of dye molecules inside the pores or attachment to the silica network. Rhodamine 6G absorption and fluorescence spectra with different concentrations, during Sol-Gel time processing, have been studied. Both, absorption and fluorescence spectra of the dye in the solid host, for different concentrations, show a blue-shift relative to its liquid phase.

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