Elastomeric Conductive Ipn From Polyaniline And Fullerene-Based Networks

1995 ◽  
Vol 413 ◽  
Author(s):  
Lee Y. Wang ◽  
Long Y. Chiang ◽  
C. S. Kuo ◽  
J. G. Lin ◽  
C. Y. Huang
Keyword(s):  
Ammonium Persulfate ◽  
Cross Linking ◽  
Synthetic Method ◽  
Near Surface ◽  
Bulk Properties ◽  
Ambient Temperatures ◽  
Polyurethane Networks ◽  
New Material ◽  
Conductive Polyaniline ◽  
Polyhydroxylated Fullerenes

ABSTRACTPolyhydroxylated fullerenes were utilized as an efficient hyper cross-linking agent in the synthesis of polyurethane networks. The resultant elastomers exhibited greatly enhanced thermal stability in comparison with those of the corresponding linear polyurethane and analogous elastomers, which were cross-linked by 1,1,1- tris(hydroxymethyl)ethane. A synthetic method leading to the preparation of a thin layer of conductive polyaniline/polyurethane IPN at the near surface of a fullerenol- based elastomeric substrate was demonstrated, using aqueous ammonium persulfate as an oxidizing agent in the presence of HCI. This new material exhibits a conductivity of 2.0 S/cm at ambient temperatures with the retention of most bulk properties of the parent elastomer, such as elongation and tensile strength at break.

Optoelectronic Properties of Plasma CVD a-Si:H Modified by Filament-Generated Atomic H

1992 ◽  
Vol 258 ◽  
Author(s):  
Y.M. Li ◽  
I. An ◽  
M. Gunes ◽  
R.M. Dawson ◽  
R.W. Collins ◽  
...  
Keyword(s):  
Film Thickness ◽  
Real Time ◽  
Chemical Potential ◽  
Defect Density ◽  
Plasma Deposition ◽  
Plasma Cvd ◽  
Near Surface ◽  
Optical Gap ◽  
New Material ◽  
Control Samples

ABSTRACTWe have studied a-Si:H prepared by alternating plasma deposition with atomic H treatments performed with a heated W filament. Real time spectroscopie ellipsometry provides the evolution of film thickness, optical gap, and a measure of the fraction of Si-Si bonds broken in the near-surface (200 Å) during H-exposure of single films. This information guided us to the desired parameters for the H-treatments. Here, we concentrate on a weak hydrogenation regime characterized by minimal etching, a higher H content by 2 at.%, and a larger optical gap by 0.02 eV for the growth/hydrogenation structures in comparison to continuously deposited control samples. This new material has shown an improvement in the defect density in the light-soaked state in comparison to the control samples. This may result from stabilization of the Si structure due to an increase in the H chemical potential in the a-Si:H.

Preparation of Highly Conductive Polyaniline in Carbamide Aqueous Solution Using SnCl4 as Initiator

2012 ◽  
Vol 476-478 ◽  
pp. 2205-2208 ◽  
Author(s):  
Guan Nan Lin ◽  
Qun Yu ◽  
Wei Wang ◽  
Gui Bao Wang
Keyword(s):  
Aqueous Solution ◽  
Ammonium Persulfate ◽  
Conductivity Measurements ◽  
X Ray ◽  
New Class ◽  
Vis Spectroscopy ◽  
Polymerization System ◽  
Novel Method ◽  
Conductive Polyaniline ◽  
Hydrolysis Of

In this paper, we demonstrated a novel method for the preparation of highly conductive polyaniline (PANI) compounded with Sn(OH)4. We obtained the PANI directly in the oxidation polymerization system via simultaneous reaction of aniline (using ammonium persulfate, APS as oxidant) and SnCl4 in carbamide aqueous solution. The resulting PANI was compounded with Sn(OH)4 had been characterized by FTIR, UV-Vis spectroscopy, X-ray diffractometry, thermal analysis, scanning electron microscope and conductivity measurements, and the results showed that PANI was in well doped state due to the hydrolysis of APS and the complex between PANI and Sn(OH)4. We are sure this alkali-guided polymerization to obtain conductive PANI will lead to the preparation of a new class of PANI composites.

scholarly journals Synthesis and Characterization of Chemically Cross-Linked CMC/Acrylamide Hydrogels

2020 ◽  
Vol 32 (5) ◽  
pp. 1109-1115
Author(s):  
Shivakumara Lachakkal Rudrappa ◽  
Sudhir Ramaswamy Iliger ◽  
Demappa Thippaiah
Keyword(s):  
Room Temperature ◽  
Aluminum Sulfate ◽  
Ammonium Persulfate ◽  
Sem Analysis ◽  
Cross Linking ◽  
Swelling Behaviour ◽  
Buffer Solutions ◽  
Aluminium Sulfate ◽  
Chemical Cross Linking

Carboxymethyl cellulose/poly(acrylamide) (CMC/Amm) hydrogels were synthesized by the chemical cross-linking method. Ammonium persulfate used as an initiator, while aluminium sulfate used as a cross-linking agent. The structure and morphology of the hydrogels were characterized by FTIR and scanning electron microscopy (SEM) analysis. The swelling behaviour of the hydrogels can be studied by using acids (CH3COOH, HCl and HClO4) and also in the pH of the buffer solutions at different temperature (room temperature, 30 and 37 ºC) was studied. Swelling of hydrogels increased with an increase in the concentration of aluminum sulfate up to 20 %, above 20 % it has found to be decreased. The effect of four series of cationic different concentrated salt solutions on the swelling had found to be the following order K+ > Na+ > Ca2+ > Mg2+.

Synthesis and Properties of Thermo- and pH-Sensitive Poly[(Sodium Humate)-(N-Isopropylacrylamide)-(Acrylic Acid)] Intelligent Hydrogel

2013 ◽  
Vol 781-784 ◽  
pp. 536-541
Author(s):  
Xiao Mi Zhou ◽  
Xiao Ran Sun ◽  
Guang Yue Li
Keyword(s):  
Acrylic Acid ◽  
Suspension Polymerization ◽  
Ammonium Persulfate ◽  
Continuous Phase ◽  
Ph Sensitive ◽  
Cross Linking ◽  
Swelling Ratio ◽  
Inverse Suspension Polymerization ◽  
Sensitive Characteristics ◽  
Intelligent Hydrogel

A novel intelligent hydrogel of poly(Humic acid - Nisopropylacrylamide - Acrylic acid) (P(NIPAAm-HA-AA)) was prepared at 70°C by inverse suspension polymerization. The reactions include uses N,N-methylene-bis-acrylamide (MBA) as a cross-linking agent, ammonium persulfate (KPS) as an initiator, cyclohexane as a continuous phase and span-65 as dispersant. The influence such as concentration of monomers and cross-linking agent, mole fraction of span-65 in mixed monomers, and temperature of polymerization on the property of resulting P(NIPAAm-HA-AA) hydrogels was investigated in detail. Fourier transform infrared (FTIR) demonstrated that NIPAAm, HA and AA was synthetized successfully. The results showed that the swelling ratio (SR) of modified hydrogel was improved significantly with the dosage of NIPAAm. It was also observed that the thermosensitive and pH sensitive characteristics was strongly affected by concentrations of NIPAAm. At last, we choose NIPAAm: HA=0.3.

Cross-linking of poly(vinyl alcohol) with N,N′-methylene bisacrylamide via a radical reaction to prepare pervaporation membranes

RSC Advances ◽  
2015 ◽  
Vol 5 (26) ◽  
pp. 19859-19864 ◽  
Author(s):  
Junjun Li ◽  
Lin Zhang ◽  
Jin Gu ◽  
Yuping Sun ◽  
Xiaosheng Ji
Keyword(s):  
Vinyl Alcohol ◽  
Radical Reaction ◽  
Ammonium Persulfate ◽  
Hydroxyl Group ◽  
Poly Vinyl Alcohol ◽  
Cross Linking

To retain the hydroxyl group of PVA, ammonium persulfate (APS) was used to initiate the polymerization of hydrogen on the PVA chain. Instead of hydroxyl-based cross-linking, the generated PVA macromolecule radicals were cross-linked with MBA to prepare PVA membranes.

The Preparation of Calcium Carbonate Modified High Water-Absorbing Resin

2014 ◽  
Vol 1035 ◽  
pp. 296-302
Author(s):  
Qi Shi ◽  
Qing Luo Meng ◽  
Nong Wang
Keyword(s):  
Calcium Carbonate ◽  
Acrylic Acid ◽  
Dry Weight ◽  
High Water ◽  
Ammonium Persulfate ◽  
Sodium Acrylate ◽  
Cross Linking ◽  
Optimum Process ◽  
Process Conditions ◽  
Modified Resin

The poly (sodium acrylate/acrylic acid) water-absorbing resin was prepared by aqueous solution polymerization with acrylic acid (AA) as the monomer, calcium carbonate as the modified additives, N, N-methylene double acrylamide (NMBA) as cross-linking agent, ammonium persulfate (APS)/sodium sulfite oxidation reduction type initiator. It was found that the adsorption performance of absorbent resin modified by calcium carbonate strengthened obviously. Orthogonal and single factor experiment were used to establish the optimum parameters related to the product preparation. The best process conditions on water-absorbing properties of the modified resin was obtained. Using 150mL acrylic acid as a benchmark, the result show the optimum process conditions: the reaction temperature is 55°C, the mass fraction of monomer is 20%, the neutralization degree is 45%, modified additive dosage is 10 g, the dosage of cross-linking agent is 0.1%, and the initiator dosage is 2.0%, respectively. After made under the optimum process conditions, the water-absorbing rate of the modified resin was 676.6 times the dry weight.

scholarly journals New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Alexander P. M. Place ◽  
Lila V. H. Rodgers ◽  
Pranav Mundada ◽  
Basil M. Smitham ◽  
Mattias Fitzpatrick ◽  
...  
Keyword(s):  
Quantum Computing ◽  
Quantum Systems ◽  
Two Dimensional ◽  
Dynamical Decoupling ◽  
Bulk Properties ◽  
New Material ◽  
Science Building ◽  
Quantum Science ◽  
The Way

AbstractThe superconducting transmon qubit is a leading platform for quantum computing and quantum science. Building large, useful quantum systems based on transmon qubits will require significant improvements in qubit relaxation and coherence times, which are orders of magnitude shorter than limits imposed by bulk properties of the constituent materials. This indicates that relaxation likely originates from uncontrolled surfaces, interfaces, and contaminants. Previous efforts to improve qubit lifetimes have focused primarily on designs that minimize contributions from surfaces. However, significant improvements in the lifetime of two-dimensional transmon qubits have remained elusive for several years. Here, we fabricate two-dimensional transmon qubits that have both lifetimes and coherence times with dynamical decoupling exceeding 0.3 milliseconds by replacing niobium with tantalum in the device. We have observed increased lifetimes for seventeen devices, indicating that these material improvements are robust, paving the way for higher gate fidelities in multi-qubit processors.

Analytical electron microscopy of TiB2 implanted with 1 MeV nickel

1983 ◽  
Vol 41 ◽  
pp. 66-67
Author(s):  
P. S. Sklad ◽  
P. Anqelini ◽  
M. B. Lewis ◽  
J. T. Houston ◽  
C. J. McHargue
Keyword(s):  
Concentration Level ◽  
Analytical Electron Microscopy ◽  
Surface Region ◽  
Near Surface ◽  
Energetic Ions ◽  
Nickel Ions ◽  
X Ray ◽  
Ambient Temperatures ◽  
Analytical Electron ◽  
Argon Ion

Recently a series of studies has been undertaken to determine the effect of ion implantation on the properties of structural ceramics. In the technique energetic ions impinge on the surface of the material displacing atoms, creating various types of point defects, and finally come to rest in the near-surface region. Because of the nature of these processes it is possible to introduce an element into the substrate to a concentration level much higher than normal equilibrium would allow. The present study is concerned with the microstructure produced by implanting TiB2 with 1 MeV nickel ions.Polycrystalline samples of TiB2 were implanted at ambient temperatures with 1 MeV Ni+ ions to a fluence of 1 × 1017 ions/cm2. The implanted samples were cut into pieces approximately 1 mm × 2 mm × 5 mm and pairs were glued together with the implanted surfaces facing each other. Slices ∼250 μm thick were then cut, mechanically polished to ∼75 μm, mounted on copper washers, and argon ion milled. This procedure allowed examination of the implanted layer in cross section. The TEM specimens were then examined in a JEM 120CX equipped with a Kevex 5100 x-ray energy dispersive spectroscopy (EDS) system interfaced to a PDP-11/34 computer and peripherals.

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