scholarly journals Polymetalates based organic-inorganic nanocomposites

1994 ◽  
Vol 3 (3) ◽  
pp. 189-197 ◽  
Author(s):  
P. Judeinstein ◽  
H. Schmidt
Keyword(s):  
Inorganic Nanocomposites

Structure and properties of polyimide-containing organo-inorganic nanocomposites

2019 ◽  
Vol 41 (3) ◽  
pp. 167-172
Author(s):  
T.A. Shantalii ◽  
◽  
S.D. Nesin ◽  
K.S. Dragan ◽  
I.L. Karpova ◽  
...  
Keyword(s):  
Structure And Properties ◽  
Inorganic Nanocomposites

Thermal stability of organic-inorganic nanocomposites based on system of dimethacrylate-tetraethoxysilane and their kinetic features

2016 ◽  
Vol 38 (3) ◽  
pp. 211-217
Author(s):  
G.I. Khovanets’ ◽  
◽  
O.Y. Makido ◽  
V.V. Kochubey ◽  
Y.G. Medvedevskikh ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Inorganic Nanocomposites ◽  
Thermal Stability Of ◽  
Kinetic Features

Phase behavior of block copolymer/inorganic nanocomposites

2008 ◽  
Vol 64 (a1) ◽  
pp. C146-C146
Author(s):  
P. Thiyagarajan ◽  
V. Pol ◽  
D. Bohnsack ◽  
C.-T. Lo ◽  
B. Lee ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Phase Behavior ◽  
Inorganic Nanocomposites

Morphological Investigations of Organic/Inorganic Nanocomposites Fabricated to Achieve Controlled Dispersion at High Loadings

2011 ◽  
Vol 1312 ◽  
Author(s):  
Andrew J. Duncan ◽  
Andrew B. Schoch ◽  
Christopher S. Gold ◽  
Joseph L. Lenhart ◽  
Frederick L. Beyer
Keyword(s):  
Surface Modification ◽  
Block Copolymer ◽  
Hierarchical Structure ◽  
Sio2 Nanoparticles ◽  
Nanocomposite Materials ◽  
Aggregation State ◽  
Twin Screw ◽  
Inorganic Nanocomposites ◽  
Morphological Investigations

ABSTRACTRealization of property enhancements inherent to the presence of nanoparticles continues to be a challenge for the production of bulk nanocomposite materials with commercially available techniques. This study combines twin-screw compounding with surface modification of SiO2 nanoparticles to enable targeted dispersion in a SEBS block copolymer. Production of these composites with high levels of well-dispersed particulates aims to leverage aggregation for production of hierarchical structure. The aggregation state of the particles as well as the level of order in the block copolymer morphology was determined through USAXS and TEM. Particles coated with ligands miscible with the end-blocks of the BCP (minority component) increased dispersion at all loading levels observed up to 10 vol%. Ligands employed to increase miscibility of the nanoparticle with the mid-block (majority component) resulted in large aggregates for all loadings without disturbance of the BCP morphology.

Random Lasers Based on Organic-Inorganic Hybrids

2002 ◽  
Vol 726 ◽  
Author(s):  
E.P. Giannelis ◽  
A. Stasinopoulos ◽  
M. Psyllaki ◽  
G. Zacharakis ◽  
R. N. Das ◽  
...  
Keyword(s):  
Polymer Matrix ◽  
Light Trapping ◽  
Fluorescence Emission ◽  
Laser Action ◽  
Threshold Value ◽  
Flat Panel Displays ◽  
Inorganic Nanocomposites ◽  
Modified Zno Nanoparticles ◽  
Surface Modified ◽  
Strong Scattering

AbstractLaser action is demonstrated in organic/inorganic nanocomposites consisting of pristine and surface-modified ZnO nanoparticles dispersed in an optically inert polymer matrix. The semiconductor particles feature simultaneously gain behavior and strong scattering ability, whereas the polymer matrix provides better processability and mechanical robustness. When excited by a laser pulse of appropriately short duration (pico- to nanoseconds), the composites give off fluorescence emission, which is strongly amplified as a result of light trapping due to multiple scattering. This laser action is manifested as a dramatic increase in the emitted light intensity accompanied by a significant spectral and temporal narrowing above a threshold value of the pumping laser intensity. Applications may include brighter flat-panel displays, inexpensive lasers for communications, military countermeasures, and lasers for search and rescue operations.

scholarly journals OLIGOMERIC SILSESQUIOXANES COMBINING AZO- AND FLUORESCENT DYES IN ORGANIC SHELL

2019 ◽  
Vol 85 (4) ◽  
pp. 71-80
Author(s):  
Mariana Gumenna ◽  
Nina Klimenko ◽  
Alexandr Stryutsky ◽  
Alexandr Shevchuk ◽  
Viktor Kravchenko ◽  
...  
Keyword(s):  
Absorption Band ◽  
Rhodamine B ◽  
Fluorescent Dyes ◽  
Hydroxyl Groups ◽  
Uv Spectrum ◽  
Absorption Bands ◽  
Organic Shell ◽  
Similar Band ◽  
Inorganic Nanocomposites ◽  
Epoxy Groups

A method for the synthesis of reactive oligomeric silsesquioxanes, combining fragments of azo dye 4-(phenylazo)phenol and fluorescent dye Rhodamine B in various proportions in an organic shell was developed. These compounds were obtained by the reaction between the oligosilsesquioxane nanoparticles consisting of a mixture of linear, branched, ladder and polyhedral structures with epoxy groups in an organic frame (OSS–Ep) and the dyes. The structure of the synthesized substances was characterized by the methods of IR and 1H NMR spectroscopy. The UV-Vis spectra of OSS–Pp–Rh in DMF solution contain absorption bands characteristic of both acidic (560 and 350 nm) and lactone (in the range of 318–326 nm) forms of Rhodamine B. The absorption band of 4-(phenylazo) phenol fragments corresponding to π−π* transition is observed at 348 nm and overlaps the absorption band of Rhodamine B at 350 nm.The intensity of the absorption bands of fragments of various dyes depends on their content in organic frame of the silsesquioxane core. The intensity of the absorption bands at 348 nm and at 560 nm increases with an increase in the content of 4-(phenylazo)phenol and Rhodamine B correspondingly.It should be noted that when using DMF as a solvent the absorption band corresponding to acidic form of Rhodamine B at 560 nm in the UV-Vis spectra of the compounds obtained is more intense than similar band in the spectrum of the original Rhodamine B. Therefore, the attachment of Rhodamine B to the silsesquioxane core of oligomeric silsesquioxanes mixture does not have a significant effect on the position of absorption maxima in the UV-spectrum and prevents dye’s fragments from converting to the colorless lactone form. In the fluorescence spectra of OSS–Pp–Rh obtained using DMF as a solvent a peak at λ max = 592 nm (λex= 520 nm) is observed. The position of the fluorescence peak and its intensity in the spectra at the same optical density of the medium practically do not depend on the ratio of fragments of 4-(phenylazo)phenol and Rhodamine B in organic frame of OSS–Pp–Rh.  The combination of two different chromophores in organic shell of the silsesquioxane core broadens the range of absorbed light and the change of their ratio allows to adjust the absorption intensity in a certain area. The presence of hydroxyl groups makes it possible to introduce the obtained compounds into the composition of polymeric organic-inorganic nanocomposites by covalent bonding.

Organic/inorganic nanocomposites of ZnO/CuO/chitosan with improved properties

2016 ◽  
Vol 178 ◽  
pp. 88-97 ◽  
Author(s):  
Xingfa Ma ◽  
Bo Zhang ◽  
Qin Cong ◽  
Xiaochun He ◽  
Mingjun Gao ◽  
...  
Keyword(s):  
Inorganic Nanocomposites
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