A NEW ORGANIC/INORGANIC HYBRID WITH HIGH ELECTRORHEOLOGICAL ACTIVITY

2002 ◽  
Vol 16 (17n18) ◽  
pp. 2454-2460 ◽  
Author(s):  
X. P. ZHAO ◽  
X. DUAN
Keyword(s):  
Activation Energy ◽  
Shear Stress ◽  
Necessary Conditions ◽  
Sol Gel ◽  
Root Temperature ◽  
Sedimentation Stability ◽  
Inorganic Hybrid ◽  
Active Particles ◽  
Static Shear

In-situ sol-gel method to prepare colloidal hybrids of surfactant modified polysucchride and titanium oxide has been presented, and experiments indicated these highly ER active particles exhibited a remarkable ER effect. The static shear stress can be up to 37 k Pa (shear rate 5 S -1) under DC field of 4 kV/mm at root temperature, well above that of simple blends of starch and TiO 2. In the meanwhile, temperature dependence and sedimentation stability were also greatly improved. Based on recent experimental facts, we find that dielectric properties and surface (interface) activity are two necessary conditions fulfilling the requirement of high ER activity. Adequate grinding of particles with oil can effectively enhance the shear stress, which may be owed to the decline of the activation energy needed for restructuring. It has provided us a new horizon for preparation of excellent ER materials and further studies should be continued to make.

Synthesis and Intermolecularly Mediated Assembly of Organic Pigment in Hybrid Coating Films

1998 ◽  
Vol 519 ◽  
Author(s):  
Y. Yan ◽  
Z. Duan ◽  
D.-G. Chen ◽  
S. Ray Chaudhuri
Keyword(s):  
Sol Gel ◽  
Hybrid Coating ◽  
Hypsochromic Shift ◽  
Hybrid Films ◽  
Coating Films ◽  
Organic Pigment ◽  
Inorganic Hybrid ◽  
Matrix Interactions ◽  
Sol Gel Process

AbstractThe insoluble, strongly hydrogen bonded organic pigment of 3,6-bis-(4-chlorphenyl)-l,4- diketopyrrolo [3,4-c] pyrrole was transiently blocked by adding carbamate groups, and consequently incorporated into organic-inorganic hybrid matrices by a sol-gel process. The homo- (pigment-pigment) and hetero-intermolecular (pigment-matrix) interactions were found to control both the assembly and dispersion of pigment molecules in the hybrid coating films. A weaker interaction between matrices and pigment molecules results in aggregation of the carbamate pigment in the methyl-silicate films. A stronger interaction forms a homogenous dispersion and coloration of the phenyl-silicate films. The as-prepared methyl- and phenylsilicate films doped with the organic pigment were distinguished by a morphology change and a blue (hypsochromic) shift in absorption from 550 to 460 nm. Thermal treatment can remove the carbamate groups and in-situ form the organic pigment in the hybrid films.

Wood-Based Nanocomposite Derived by in Situ Formation of Organic–Inorganic Hybrid Polymer within Wood via a Sol–Gel Method

2017 ◽  
Vol 9 (10) ◽  
pp. 9070-9078 ◽  
Author(s):  
Xiaoying Dong ◽  
Xiao Zhuo ◽  
Jie Wei ◽  
Gang Zhang ◽  
Yongfeng Li
Keyword(s):  
Sol Gel ◽  
Hybrid Polymer ◽  
Inorganic Hybrid ◽  
Gel Method ◽  
Sol Gel Method ◽  
In Situ Formation

Fabrication of transparent polymer-inorganic hybrid material

2005 ◽  
Vol 876 ◽  
Author(s):  
S. Li ◽  
M. S. Toprak ◽  
Y. S Jo ◽  
D. K. Kim ◽  
M. Muhammed
Keyword(s):  
Hybrid Materials ◽  
Hybrid Material ◽  
Zinc Acetate ◽  
Zinc Acetate Dihydrate ◽  
Sol Gel ◽  
Shielding Effect ◽  
Complexing Agent ◽  
Inorganic Hybrid ◽  
Zinc Compound

AbstractPolymer-inorganic hybrid materials composed of polymethyl methacrylate (PMMA) and zinc compounds were prepared by sol-gel in-situ transition polymerization of zinc complex in PMMA matrix. Zinc acetate dihydrate dissolved in ethanol was used as the inorganic precursor. Monoethanolamine (MEA) acted as a complexing agent to control the hydrolysis of zinc acetate to produce a zinc compound network, and then PMMA, formed in-situ through a radical polymerization, were chemically bonded to the forming zinc compound network to realize a hybrid material. Transparent homogenous hybrid materials with slight colours from pink to yellow were fabricated by varying the composition. TEM, FT-IR were employed to investigate structural and physical properties. The UV-shielding effect was evaluated by UV-VIS. The low content of zinc (around 0.02 wt%) and the fine particle size rendered it visibly transparent and capable of greatly attenuating UV radiation in the full UV range.

The Preparation and Characterization of Organic–Inorganic Hybrid Material Amino Monolithic Column for Capillary Electro Chromatography

2011 ◽  
Vol 130-134 ◽  
pp. 410-413 ◽  
Author(s):  
Bao Hui Li ◽  
Bao Juan Tian
Keyword(s):  
Hybrid Material ◽  
Monolithic Column ◽  
Sol Gel ◽  
Inorganic Hybrid ◽  
Inorganic Hybrid Material ◽  
Capillary Electro

In this paper a novel hybrid organic–inorganic amino hybrid material monolithic column for capillary electro chromatography (CEC) is preparation and characterization. The amido hybrid material monolithic column was prepared in situ co-condensation of tetraethoxysilane (TEOS) with 3-aminoproplytriethoxysilane (3-APTES) via sol-gel procedure. The all kinds of factors that effect the morphology of monolith column were investigated. The results showed that the structure of monolithic column could be adjusted easily through altering the composition of sol solution.

Synthesis and Oxidation Kinetics of Sol-Gel and Sputtered Tantalum Nitride Thin Films

1995 ◽  
Vol 410 ◽  
Author(s):  
Gerald T. Kraus ◽  
Cory S. Oldweiler ◽  
Emmanuel P. Giannelis
Keyword(s):  
Thin Films ◽  
Activation Energy ◽  
Oxidation Kinetics ◽  
Sol Gel ◽  
Tantalum Nitride ◽  
Sputtered Films ◽  
Parabolic Oxidation ◽  
Sol Gel Films ◽  
Kinetics Of

ABSTRACTTantalum nitride thin films were produced by nitridation of sol-gel tantala thin films. The oxidation kinetics and the activation energy for oxidation were investigated and compared to those of sputtered tantalum nitride thin films. Data was gathered from in situ sheet resistance measurements taken between 550 and 720 K. Sol-gel films exhibited parabolic oxidation kinetics and had an activation energy of 1.9 eV. Sputtered films displayed quartic oxidation kinetics at lower temperatures tending toward cubic kinetics at higher temperatures and had an activation energy of 1.6 eV.

Structural, Thermal, and Thermomechanical Behaviors of Phenolic-Inorganic Hybrid Composites

2000 ◽  
Vol 628 ◽  
Author(s):  
Samuel Amanuel ◽  
Vivak M. Malhotra
Keyword(s):  
Hybrid Composites ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Dynamic Mechanical Analyzer ◽  
Scanning Calorimetry ◽  
Inorganic Hybrid ◽  
Phenolic Polymer ◽  
Frictional Materials ◽  
Gel Technique

ABSTRACTIn pursuit of our goal of forming organic-inorganic hybrid frictional materials, we produced two types of composites, i.e., conventional and hybrid. We formed conventional composites by dispersing fly ash, montmorillonite clay, or pre-formed nano-sized silica particles in phenolic matrix. Hybrid composites were fabricated from sol-gel technique using tetramethylor-thosilicate-phenolic mixtures. We subjected our samples to X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), in-situ transmission-Fourier transform infrared (ISTA-FTIR), and dynamic mechanical analyzer (DMA) measurements at 40°C < T < 310°C. Our results suggested that the curing behavior of the phenolic polymer was affected by the concentration of the silica and hybrid composites manifested mechanical properties, which were substantially different from that of conventional composites.

Epoxidized Natural Rubber / Silica Nanoscale Organic-Inorganic Hybrid Composites Prepared by Sol-Gel Technique

2004 ◽  
Vol 77 (5) ◽  
pp. 830-846 ◽  
Author(s):  
Abhijit Bandyopadhyay ◽  
Mousumi De Sarkar ◽  
Anil K. Bhowmick
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Hybrid Composites ◽  
Sol Gel ◽  
Hybrid Nanocomposites ◽  
Dicumyl Peroxide ◽  
Inorganic Hybrid ◽  
Gel Technique ◽  
Rubber Phase

Abstract Epoxidized natural rubber (ENR) / silica organic-inorganic hybrid nanocomposites were prepared by using a sol-gel technique. Tetraethoxysilane was used as the precursor for the in-situ generation of silica. The choice of ENR as a matrix was made because of its polar nature which can interact with the in-situ generated silica. The sol-gel reaction was carried out at room temperature by dissolving the rubber in tetrahydrofuran solvent using hydrochloric acid as the catalyst. The resultant composite films appeared transparent up to 50 wt% of tetraethoxysilane loading. Dispersion of the discrete silica particles having dimensions of 15 – 100 nm was observed through transmission electron microscope. Scanning electron microscopic studies did not produce any evidence for formation of silica network within the bulk of the composite. Infrared spectroscopic studies indicated the occurrence of chemical interaction within the rubber /silica organic-inorganic interfaces which was further supported by the insolubility of the respective samples in tetrahydrofuran under the ambient conditions. Mechanical reinforcement within the hybrid nanocomposites, both at high and low temperature regions, was demonstrated through dynamic mechanical analysis. The composites exhibited superior tensile strength and tensile moduli compared to the gum rubber samples. Further reinforcement was noticed when the rubber phase in the nanocomposites was cured with either benzoyl peroxide or dicumyl peroxide. The dicumyl peroxide cured hybrid composites displayed 112% improvement in tensile strength over the control crosslinked rubber sample, probably due to synergisms of nanosilica reinforcement and crosslinking of the rubber phase in the hybrids.

scholarly journals Organic–inorganic hybrid coating materials derived from renewable soybean oil and amino silanes

RSC Advances ◽  
2020 ◽  
Vol 10 (27) ◽  
pp. 15881-15887
Author(s):  
Xuyang Luo ◽  
Fei Gao ◽  
Fengbiao Chen ◽  
Qian Cheng ◽  
Jinze Zhao ◽  
...  
Keyword(s):  
Soybean Oil ◽  
Sol Gel ◽  
Hybrid Coating ◽  
Coating Material ◽  
Coating Materials ◽  
Inorganic Hybrid ◽  
One Step ◽  
Gel Technique

A novel coating material was synthesized in one-step comprising two reactions (an amine–acetoacetate reaction and an in situ sol–gel technique).

Super-tough, anti-fatigue, self-healable, anti-fogging, and UV shielding hybrid hydrogel prepared via simultaneous dual in situ sol–gel technique and radical polymerization

2019 ◽  
Vol 7 (45) ◽  
pp. 7162-7175 ◽  
Author(s):  
Juan Du ◽  
Xiaohong She ◽  
Wenli Zhu ◽  
Qiaoling Yang ◽  
Huaju Zhang ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Mechanical Performance ◽  
Sol Gel ◽  
Hybrid Hydrogel ◽  
Inorganic Hybrid ◽  
Uv Shielding ◽  
Gel Technique

A hydrogel crosslinked by hierarchical inorganic hybrid crosslinks via simultaneous in situ sol–gel technique and radical polymerization exhibits excellent mechanical performance.

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