Electrochemical synthesis

Xem 1-12 trên 12 kết quả Electrochemical synthesis
  • Metal nanoparticles are certain to be the building blocks of the next generation of electronic, optoelectronic and chemical sensing devices. The physical limits imposed by top-down methods such as photo- and electron- beam lithography dictate that the synthesis and assembly of functional nanoscale materials will become the province of chemists.

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  • are not limited to: the wide range of oxidation and reduction reactions possible, the possibility of reaching very high levels of product purity and selectivity, and significantly less energy requirement. The process of electropolymerization leads to simple and reproducible formations of polymer films, which led to a broad material diversity of applications. Nowadays, electrochemistry plays an important role in a wide number of fundamental research and applied areas.

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  • In recent years, great focus has been placed upon polymer thin films. These polymer thin films are important in many technological applications, ranging from coatings and adhesives to organic electronic devices, including sensors and detectors. Polymers can be prepared using chemical and/or electrochemical methods of polymerization. There are a few advantages of electrosynthesis over chemical methods.

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  • DWTs are constantly used to solve and treat more and more advanced problems. The DWT algorithms were initially based on the compactly supported conjugate quadrature filters (CQFs). However, a drawback in CQFs is due to the nonlinear phase effects such as spatial dislocations in multi-scale analysis. This is avoided in biorthogonal discrete wavelet transform (BDWT) algorithms, where the scaling and wavelet filters are symmetric and linear phase. The biorthogonal filters are usually constructed by a ladder-type network called lifting scheme.

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  • Tribasic lead sulfate Ž3BS. and tetrabasic lead sulfate Ž4BS., used as precursors of the positive active material in the leadracid batteries, were prepared by a new method: reactive grinding. The effects of various experimental parameters Žstoichiometry, hygrometry of the starting compounds, duration of mechanical treatment. upon the nature and morphological features of the resulting phase were investigated.

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  • This volume, of a two volume set on ionic liquids, focuses on the applications of ionic liquids in a growing range of areas. Throughout the 1990s, it seemed that most of the attention in the area of ionic liquids applications was directed toward their use as solvents for organic and transition-metal-catalyzed reactions. Certainly, this interest continues on to the present date, but the most innovative uses of ionic liquids span a much more diverse field than just synthesis.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Synthesis and Electrochemical Sensing Toward Heavy Metals of Bunch-like Bismuth Nanostructures

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  • The oxide reduction diffusion (ORD) procedure has recently been applied in synthesizing hydrogen storage materials AB5 for Ni-MH batteries. Starting from metal hydroxides and La oxalat precursor, superfine powder alloys LaNi5, LaNi4.5Co0.5 and LaNi3.87Mn1.13 were obtained by this “soft-chemistry” route. Chemical composition, structure and morphology of alloy phases were examined by different analysis techniques such as AAS, EPMA, X-ray and TEM. The H2-absorption and desorption behavior of crystalline products was determined by Sieverts’ method.

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  • Sol-gel process, a most usefully and effectively process, has a lot of advantage for preparation of a variety of advanced materials in various structures and sizes, via polymerization of metal and semiconductor hydroxides or via hydrolysis and condensation of their alkoxides, since in nucleophilic substitution (SN) reaction and nucleophilic addition (AN) reaction, the substituent with thelargest partial negative charge,is the nucleophile, and in SN reactions the substituent with the largest positive charge, + , is theleaving group or nucleofugal.

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  • Zhou et al. Nanoscale Research Letters 2011, 6:364 http://www.nanoscalereslett.com/content/6/1/364 NANO EXPRESS Open Access Electro-synthesis of novel nanostructured PEDOT films and their application as catalyst support Cuifeng Zhou1, Zongwen Liu1*, Yushan Yan2, Xusheng Du3*, Yiu-Wing Mai3 and Simon Ringer1 Abstract Poly(3,4-ethylenedioxythiophene) (PEDOT) films doped with nitric and chlorine ions have been electrochemically deposited simply by a one-step electrochemical method in an aqueous media in the absence of any surfactant.

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  • This study is focused on the synthesis of a polyindole doped by indole-3 butyric acid (PI-IBA). IR analyze indicated that the linkage positions of indole involves the position 2 and 3 of the monomer and the insertion of IBA in the polymer backbone. Polyindole IBA doped was incorporated into epoxy resin for protection anticorrosion of carbon steel. The electrochemical impedance measurements show a significantly improvement of protective properties in presence of PI-IBA in comparison with pure epoxy and epoxy containing polyindole coating.

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  • The synthesis and involvement of H2O2 during the early stages of melano-genesis involving the oxidations of DOPA and dopamine (diphenolase activity) were established by two sensitive and specific electrochemical detection systems. Catalase-treated reaction mixtures showed diminished rates of H2O2 production during the autoxidation and tyrosinase-mediated oxidation of both diphenols.

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