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排序方式: 共有128条查询结果,搜索用时 281 毫秒
51.
52.
Transformation reactions provide a facile route to synthesise block copolymers that cannot be made from a single polymerisation mode. A variety of transformation reactions involving free radical, cationic, anionic, group transfer, Ziegler–Natta and metathesis are known. In this article, transformation reaction involving metathesis polymerisation is reviewed. 相似文献
53.
Gurusamy Manivannan Pichai Maruthamuthu 《Journal of polymer science. Part A, Polymer chemistry》1986,24(12):3393-3398
The kinetics of polymerization of acrylonitrile initiated by peroxomonosulphate (PMS) has been carried out in the temperature range 45–60°C at constant ionic strength of 0.50 mol dm?3 under deaerated conditions. The rate of polymerization Rp has been investigated at various concentrations of monomer and initiator. The effects of [monomer], [initiator], [H+], ionic strength, temperature, and reducing agents (organic and inorganic substrates) on the rate of polymerization have been observed. Activation energy was found to be 15.2 kcal mol?1. 相似文献
54.
Electrochemical Biosensor Utilizing Supramolecular Association of Enzyme on Sol−gel Matrix Embedded Gold Nanoparticles Supported Reduced Graphene Oxide−cyclodextrin Nanocomposite
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Herein we present β‐cyclodextrin (CD)‐functionalized reduced graphene oxide (RGO) nanosheets supported on silicate sol‐gel matrix‐embedded gold nanoparticles (Au NPs) modified electrode as a new affinity binding nanocomposite. The modified electrode is fabricated through layer‐by‐layer drop casting followed by immobilization of chemically modified enzyme conjugate (horse radish peroxidase (HRP)?adamantane carboxylic acid (ADA)). This affinity system is based on the supramolecular association between CDs and HRP?ADA and is mimicking the biological avidin?biotin interactions. CDs‐functionalized RGO (RGO?CD) functions as a macrocyclic host to form stable supramolecular inclusion complexes with enzyme conjugate. Besides Au NPs improve the interfacial interaction with RGO?CD nanosheets, and thus exhibit synergistic electrocatalytic effect toward H2O2 reduction in the presence of 1 mM hydroquinone. 相似文献
55.
Dhanuskodi S Manivannan S Philip J 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2008,69(4):1207-1212
Semiorganic 1-methyl-2,6-dimethyl-4-hydroxypyridinium chloride monohydrate (MDMPCl.H(2)O) and bromide monohydrate (MDMPBr.H(2)O) salts have been synthesized. Single crystals of MDMPCl.H(2)O and MDMPBr.H(2)O were grown by the slow evaporation method from aqueous solution at constant temperatures 30 and 32 degrees C respectively. The grown crystals were characterized by elemental analysis, FT-IR and FT-NMR techniques and their molecular structures were elucidated. Thermogravimetric, differential thermal analyses and differential scanning calorimetry reveal the presence of water molecules in the crystal lattices and thermal stabilities. Optical transmittance windows in aqueous solution were found as 300-1100 nm using UV-vis-NIR spectrophotometer. 相似文献
56.
Jaleel CA Gopi R Manivannan P Gomathinayagam M Sridharan R Panneerselvam R 《Colloids and surfaces. B, Biointerfaces》2008,62(2):312-318
The variations in antioxidant potentials and indole alkaloid content were studied in the present investigation, in two varieties (rosea and alba) of Catharanthus roseus, an important herb used in traditional as well as modern medicine, exposed to water deficit stress. The antioxidant and alkaloid profiles were estimated from root, stem, leaf, flowers and pods. The antioxidant potentials were examined in terms of non-enzymatic antioxidant molecules and activities of antioxidant enzymes. The non-enzymatic antioxidant molecules studied were ascorbic acid (AA), -tocopherol (-toc) and reduced glutathione (GSH). The estimated antioxidant enzymes were superoxide dismutase (SOD), ascorbate peroxidase (APX), catalase (CAT), peroxidase (POX) and polyphenol oxidase (PPO). The antioxidant concentrations and activities of antioxidant enzymes were high under water deficit stress in all parts of the plants. Indole alkaloid content was high in the roots of rosea variety in response to stress when compared to alba variety. 相似文献
57.
Controlled nanosized TiO2 particles of 4–10 nm were synthesized by a simple hydrolysis method followed by calcination at different temperatures. These
particles were investigated using X-ray diffraction (XRD), Photoacoustic/Fourier transform infrared (PA/FTIR) spectroscopy,
Raman spectroscopy and electron spin resonance (ESR) spectroscopy to understand their structural properties. X-ray diffraction
studies confirmed the anatase phase of the particles where as the PA/FTIR revealed the bands around 1,500 and 3,300 cm−1 due to –OH bands. ESR spectroscopic investigations carried out from 5 to 300 K indicated the presence of an ESR line at g = 2.00 emerging from radical species. It is significant to note that the intensity of the ESR line decreased as the particle
size increased. 相似文献
58.
Kumar A. Mohan Parameshwaran R. Rajasekar R. Moganapriya C. Manivannan R. 《Mechanics of Composite Materials》2022,58(1):97-112
Mechanics of Composite Materials - The drilling is a very important machining process to increase the joining efficiency of assembled parts. In this review, the consolidation of various composite... 相似文献
59.
Karunarathne K. A. Janani K. Perera Kumudu S. Vidanapathirana Kamal P. Pitawela Jagath C. 《Journal of Solid State Electrochemistry》2019,23(7):2165-2171
Journal of Solid State Electrochemistry - Super capacitors have emerged as a promising substitute for batteries and conventional capacitors which have played a key role as energy storage devices.... 相似文献
60.
S. Muralisankar A. Manivannan P. Balasubramaniam 《Communications in Nonlinear Science & Numerical Simulation》2012,17(10):3876-3893
In this paper, the robust stability for uncertain neutral stochastic system with Takagi–Sugeno (T–S) fuzzy model and Markovian jumping parameters (MJPs) are investigated. The jumping parameters considered here are generated from a continuous-time discrete-state homogeneous Markov process, which are governed by a Markov process with discrete and finite-state space. Some novel sufficient conditions are derived to guarantee the asymptotic stability of the equilibrium point in the mean square. By utilizing the Lyapunov–Krasovskii functional, stochastic analysis theory, some free weighting matrices and linear matrix inequality (LMI) technique, the upper bound of time-varying delay is obtained by using Matlab® control toolbox. Finally, some numerical examples are given to show the effectiveness of the obtained results. 相似文献