The Experts below are selected from a list of 44781 Experts worldwide ranked by ideXlab platform
Charles R. Martin - One of the best experts on this subject based on the ideXlab platform.
-
Template Synthesis of Nano Test Tubes
Nano Letters, 2004Co-Authors: Rahela Gašparac, Punit Kohli, Miguel O. Mota, Lacramioara Trofin, Charles R. MartinAbstract:We have been investigating potential biomedical and biotechnological applications of Template-synthesized nanotubes. One application we envision for these nanotubes is as vehicles for delivery of drugs, DNA, proteins or other biomolecules. The nanotubes that we have prepared previously have been open on both ends − like pipes. For the biomolecule deliver application, it would be best to have nanotubes that are closed on one end and open on the other − nano test tubes. This test tube geometry would allow for convenient filling of the nanotube with the biomolecule of interest, and by applying a cap to the open end, the biomolecule could be kept “bottled-up” inside until it is ready to be delivered. We describe here a simple modification of the Template-Synthesis method that allows for the preparation of nano test tubes. Prototype silica nano test tubes are described here. We show that the outside diameter of these test tubes is determined by the pore diameter in the Template membrane used and that the lengt...
-
Template Synthesis of bismuth telluride nanowires
Advanced Materials, 1999Co-Authors: Shawn A Sapp, Brinda B Lakshmi, Charles R. MartinAbstract:Abstract : We report the fabrication of thermoelectric bismuth telluride nanowires using the Template Synthesis method. A simple electrodeposition procedure was used to produce the nanowires within the pores of an alumina filtration membrane. The resulting bismuth telluride/alumina composite membranes constitute an array of thermoelectric nanowires surrounded by a thermally and electrically insulating matrix. The individual bismuth telluride nanowires can be isolated by removal of the Template membrane. These nanowires were characterized and found to be composed of stoichiometric bismuth telluride.
-
sol gel Template Synthesis of semiconductor oxide micro and nanostructures
Chemistry of Materials, 1997Co-Authors: Brinda B Lakshmi, Charles J Patrissi, Charles R. MartinAbstract:The Template method for synthesizing nanostructures involves the Synthesis of the desired material within the pores of a nanoporous membrane or other solid. Our work has involved using porous alumina and polymeric filter membranes as the Templates. Fibrils or tubules of the desired material are formed within each pore of the Template membrane. A number of synthetic methods have been used to synthesize these nanostructures. This paper reviews sol−gel Template Synthesis: the use of sol−gel chemistry to synthesize semiconductor oxide micro- and nanostructures within the pores of micro- and nanoporous membranes. For example, TiO2 nanotubules and nanofibers of the anatase form have been synthesized. The high surface area offered by these TiO2 nanostructures has been used for photodecomposition of salicylic acid in sunlight. Enzyme immobilization by stannous bridges inside the TiO2 tubes has also been studied. In addition, V2O5 fibrous electrode materials have been prepared by this method and Li intercalation ...
-
Template Synthesis of electronically conductive polymer nanostructures
Accounts of Chemical Research, 1995Co-Authors: Charles R. MartinAbstract:Abstract : Nanochemistry is an emerging subdiscipline in the chemical and materials sciences that deals with the development of methods for synthesizing nanoscopic bits of a desired material and with chemical and other investigations of the nanomaterial obtained. My research group has been exploring a general method, called "Template-Synthesis," for preparing nanomaterials. This method entails synthesizing the desired material within the pores of a nanoporous membrane. The membranes employed have cylindrical pores of uniform diameter. In essence, we view each of these pores as a "nanobeaker" in which a piece of the desired material is synthesized. We have used this method to prepare nanostructures composed of electronically conductive polymers, metals, semiconductors, and other materials. In this Accounts article, I discuss my work on Template Synthesis of electronically conductive polymer nanostructures. I will show that these conductive polymer nanostructures have interesting and unusual electronic properties and that these nanostructures provide an opportunity for exploring how molecular and supermolecular structure affect conductivity in conductive polymers.
-
Template-Synthesis: A Method for Enhancing the Ionic and Electronic Conductivity in Electronically Conductive Polymers
Electrochimica Acta, 1992Co-Authors: Charles R. Martin, Leon S. Van Dyke, Zhihua CaiAbstract:Abstract : Template-Synthesis entails the Synthesis of an electronically conductive polymer (or other material) within the pores of a microporous membrane. The membranes used have cylindrica pores of equivalent pore diameter; as a result, polymeric fibers are obtained, where the diameters of the fibers are determined by the diameter of the pores in the Template membrane. We show in this paper that Template-synthesized polypyrrole fibers show faster rates of charge transport, during electrochemical undoping, and dramatically higher electronic conductivitie than conventional forms (e.g. electrochemically-synthesized film) of this polymer.
O. V. Mikhailov - One of the best experts on this subject based on the ideXlab platform.
-
Soft Template Synthesis of aza- and thiazametalmacrocyclic compounds in thin gelatin films
European Chemical Bulletin, 2014Co-Authors: O. V. MikhailovAbstract:The problems concerned with the processes of Template Synthesis of 3 d -element aza- and thiazametalmacrocyclic complexes that happen in nano reactors on the basis of thin films metalhexacya-noferrate(II) gelatin-immobilized matrix implants under their contact with water solutions containing various (N,O,S)-donor atomic ligands and organic compounds having one or two carbonyl groups have been considered. It was noted that, in a series of cases, the variety of metalmacrocyclic compounds obtained at Template Synthesis in such specific conditions considerably differs from that of metalmacrocycles formed at the conditions traditional for chemical Synthesis.
-
On Template Synthesis in the ternary system Ni(II)-thiosemicarbazide-diacetyl
Russian Journal of Inorganic Chemistry, 2013Co-Authors: O. V. Mikhailov, M. A. Kazymova, Denis V. ChachkovAbstract:A new complexation process in the ternary system Ni(II)-hydrazinomethanethioamide (thiosemicarbazide)-2,3-butanedione (diacetyl) has been studied. Complexation occurs in an aqueous ethanol solution and in nickel(II) hexacyanoferrate(II) gelatin-immobilized matrix systems. It has been shown that, under these conditions, the process involves the “self-assembly” (Template Synthesis) of Ni(II) macrotricyclic complexes with a new chelating ligand—4,5-dimethyl-1,8-dimercapto-2,3,6,7-tetraaza-1,3,5,7-octatet-raene-1,8-diamine with the (NSSN) coordination of donor atoms to the metal atom.
-
Mild Template Synthesis in the iron(III)-ethanedithioamide-1,2-formaldehyde triple system on a K[Fe2(CN)6] gelatin-immobilized matrix
Journal of Coordination Chemistry, 2009Co-Authors: O. V. Mikhailov, Denis V. ChachkovAbstract:Complexation of FeIII, in the form of K[Fe2(CN)6] gelatin-immobilized matrix, in contact with aqueous-alkaline solutions (pH ∼ 12) containing ethanedithioamide-1,2 and formaldehyde, has been studied. Template Synthesis leading to a chelate FeIII coordination compound with a tetradentate N,N,S,S-donor ligand identified as 4,4,6-trimethyl-1,9-diamino-1,9-dimercapto-3,7-diazanon-3-en-2,8-dithione and hydroxy co-ligand occurs under these specific conditions. Ethanedithioamide-1,2 and formaldehyde are the ligand synthons in the process studied.
-
Soft Template Synthesis in the cobalt(III)–1,2-diaminoethane-1,2-dithione–propanone triple system on a K[CoFe(CN)_6]-gelatin-immobilized matrix
Transition Metal Chemistry, 2008Co-Authors: O. V. Mikhailov, Marina A. KazymovaAbstract:Complexation of Co^III, in the form of K[CoFe(CN)_6]-gelatin-immobilized matrix, in contact with aqueous-alkaline solutions (pH ∼ 12) containing 1,2-diaminoethane-1,2-dithione and propanone, has been studied. Template Synthesis leading to a chelate Co^III coordination compound with a tetradentate N , N , S , S -donor ligand identified as 4,4,6-trimethyl-1,9-diamino-1,9-dimercapto-3,7-diazanon-3-en-2,8-dithione and hydroxy co-ligand occurs under these specific conditions. 1,2-Diaminoethane-1,2-dithione and propanone are the ligand synthons in this process.
-
soft Template Synthesis in the cobalt iii 1 2 diaminoethane 1 2 dithione propanone triple system on a k cofe cn 6 gelatin immobilized matrix
Transition Metal Chemistry, 2008Co-Authors: O. V. Mikhailov, Marina A. KazymovaAbstract:Complexation of CoIII, in the form of K[CoFe(CN)6]-gelatin-immobilized matrix, in contact with aqueous-alkaline solutions (pH ∼ 12) containing 1,2-diaminoethane-1,2-dithione and propanone, has been studied. Template Synthesis leading to a chelate CoIII coordination compound with a tetradentate N,N,S,S-donor ligand identified as 4,4,6-trimethyl-1,9-diamino-1,9-dimercapto-3,7-diazanon-3-en-2,8-dithione and hydroxy co-ligand occurs under these specific conditions. 1,2-Diaminoethane-1,2-dithione and propanone are the ligand synthons in this process.
Oleg V. Mikhailov - One of the best experts on this subject based on the ideXlab platform.
-
Molecular structure design and soft Template Synthesis of aza-, oxaaza- and thiaazamacrocyclic metal chelates in the gelatin matrix
Arabian Journal of Chemistry, 2017Co-Authors: Oleg V. MikhailovAbstract:The data about of soft Template Synthesis proceeding in gelatin matrices in [3d-element M(II) ion – (N,S)- or (N,O,S)-ambidentate ligson – mono- or dicarbonyl ligson] systems, have been considered and discussed. The chemical nature of the final products of Template Synthesis formed under these specific conditions, has been compared with the chemical nature of the final products formed by Template Synthesis in solutions. It has been noted that in many cases, the nature and chemical composition of these products differ substantially. Specific features of the DFT calculated molecular structures of the macrocyclic compounds that can be formed due to the Template Synthesis in the systems indicated above, have been discussed, too. The review covers the period 1990–2015.
-
Sol–gel technology and Template Synthesis in thin gelatin films
Journal of Sol-Gel Science and Technology, 2014Co-Authors: Oleg V. MikhailovAbstract:Processes of sol–gel technology of Template Synthesis of 3d-element metal macrocyclic complexes that occurs in thin films of metalhexacyanoferrate(II) gelatin-immobilized matrix implants under their contact with water solutions containing various (N,O,S)-donor atomic and (C=O) containing organic compounds, have been discussed. It was noted that, in a series of cases, sol–gel technology of Template Synthesis in the given specific conditions allows to realize such metal macrocyclic complexes formation processes that are not typical at the complexing in solutions or solid phase.
-
On the Possibility of Template Synthesis in the Ternary System of Vanadium(IV)-Dithiooxamide-Formaldehyde
Russian Journal of General Chemistry, 2009Co-Authors: Denis V. Chachkov, Oleg V. MikhailovAbstract:With application of hybride method of density functional B3LYP with the 6–31G(d) basis set we calculated geometric parameters of macrocyclic complexes formed at the Template reactions in the system V(IV)-dithiooxamide-formaldehyde of dioxovanadium(IV). The complexes are formed by tetradentate chelate ligands by means of (NNSS)- and (NNNN)-coordination of donor centers. Atomic coordinates and bond lengths of the formed complexes are listed. The values of enthalpy and Gibbs energy of the formation of the complexes are calculated and it is resumed that the Template Synthesis in such system can be realized at the complex formation in gelatin-immobilized matrix only.
-
Template Synthesis into gelatin-immobilized matrix as perspective method of obtaining supramolecular macroheterocyclic compounds
Macroheterocycles, 2008Co-Authors: Oleg V. Mikhailov, Marina A. Kazymova, Denis V. ChachkovAbstract:Template Synthesis processes proceeding for M ion – ligand synthon I – ligand synthon II triple systems (M= Co, Ni, Cu) into solutions and gelatin-immobilized matrix, have been obtained and analyzed. It has been shown that final results of these processes are distinguished extremely considerably. The distinction predicted has been displayed by examples of Template Synthesis for some M– (N,S)-,(N,O,S)-ambidentate ligand synthon – (C=O)-containing ligand synthon in water-ethanol solutions and metalhexacyanoferrate gelatin-immobilized matrix implantates. The quantumchemical calculation of structures of macrocyclic coordination compounds formed as a result of Template processes, has been carried out with using DFT B3LYP method.
-
Template Synthesis in the nickel ii thiocarbohydrazide propanone triple system
Transition Metal Chemistry, 2005Co-Authors: Oleg V. Mikhailov, Marina A. Kazymova, Tatyana A. Shumilova, Galina A Chmutova, Svetlana S. SolovievaAbstract:The complexing process proceeding in the Ni II –thiocarbohydrazide (H2N–H–NC(=S)–NH–NH2)–propanone triple system in EtOH solution and nickel(II)hexacyanoferrate(II) gelatin-immobilized matrix has been studied. It has been found that in the first case, Template Synthesis leading, as a minimum, to formation of three coordination compounds of Ni II with (N,N,S,S)-donor tetradentate ligands having NiL 1 , NiL 2 and NiL 3 compositions where L 1 is 4,6,6-trimethyl-2,3,7,8-tetraazanonen-3-di(thiohydrazide)-1,9, L 2 is 4,6,6,12-tetrametyl-1,9-dithio-2,3,7,8,10,11-hexaazatridekadien-3,11-hydrazide-1 and L 3 is 2,8,10,10,16-pentamethyl-5,13-dithio-3,4,6,7,11,12,14,15-octaazaheptadekatrien-2,7,15 is observed, whereas in the gelatin-immobilized matrix, a complexing process in the system considered does not occur.
Brinda B Lakshmi - One of the best experts on this subject based on the ideXlab platform.
-
Template Synthesis of bismuth telluride nanowires
Advanced Materials, 1999Co-Authors: Shawn A Sapp, Brinda B Lakshmi, Charles R. MartinAbstract:Abstract : We report the fabrication of thermoelectric bismuth telluride nanowires using the Template Synthesis method. A simple electrodeposition procedure was used to produce the nanowires within the pores of an alumina filtration membrane. The resulting bismuth telluride/alumina composite membranes constitute an array of thermoelectric nanowires surrounded by a thermally and electrically insulating matrix. The individual bismuth telluride nanowires can be isolated by removal of the Template membrane. These nanowires were characterized and found to be composed of stoichiometric bismuth telluride.
-
Template Synthesis of bismuth telluride nanowires. Interim report
1998Co-Authors: Shawn A Sapp, Brinda B Lakshmi, C.r. MartinAbstract:The authors report the fabrication of thermoelectric bismuth telluride nanowires using the Template Synthesis method. A simple electrodeposition procedure was used to produce the nanowires within the pores of an alumina filtration membrane. The resulting bismuth telluride/alumina composite membranes constitute an array of thermoelectric nanowires surrounded by a thermally and electrically insulating matrix. The individual bismuth telluride nanowires can be isolated by removal of the Template membrane. These nanowires were characterized and found to be composed of stoichiometric bismuth telluride.
-
sol gel Template Synthesis of semiconductor oxide micro and nanostructures
Chemistry of Materials, 1997Co-Authors: Brinda B Lakshmi, Charles J Patrissi, Charles R. MartinAbstract:The Template method for synthesizing nanostructures involves the Synthesis of the desired material within the pores of a nanoporous membrane or other solid. Our work has involved using porous alumina and polymeric filter membranes as the Templates. Fibrils or tubules of the desired material are formed within each pore of the Template membrane. A number of synthetic methods have been used to synthesize these nanostructures. This paper reviews sol−gel Template Synthesis: the use of sol−gel chemistry to synthesize semiconductor oxide micro- and nanostructures within the pores of micro- and nanoporous membranes. For example, TiO2 nanotubules and nanofibers of the anatase form have been synthesized. The high surface area offered by these TiO2 nanostructures has been used for photodecomposition of salicylic acid in sunlight. Enzyme immobilization by stannous bridges inside the TiO2 tubes has also been studied. In addition, V2O5 fibrous electrode materials have been prepared by this method and Li intercalation ...
Atsunori Matsuda - One of the best experts on this subject based on the ideXlab platform.
-
Sol-gel Template Synthesis of BaTiO3 films with nano-periodic structures
Materials Letters, 2018Co-Authors: Go Kawamura, Hiroyuki Muto, Kazuhiro Ohara, Wai Kian Tan, Kazuhiro Yamaguchi, Aldo R. Boccaccini, Atsunori MatsudaAbstract:Abstract BaTiO3 films with novel nano-periodic structures were prepared by a sol-gel Template Synthesis. A through-hole type anodic aluminum oxide film was used as a Template. The nano-periodic structure was drastically modified by applying a spray cleaning process during spin-coating of the Template with a BaTiO3 sol. The formation mechanism was discussed from the viewpoint of liquid bridge force and surface tension applied during the drying process. The novel structures are promising for various functional devices, in which the nano-periodicity improves their performance.
-
Hard Template Synthesis of metal nanowires
Frontiers in chemistry, 2014Co-Authors: Go Kawamura, Hiroyuki Muto, Atsunori MatsudaAbstract:Metal nanowires (NWs) have attracted much attention because of their high electron conductivity, optical transmittance and tunable magnetic properties. Metal NWs have been synthesized using soft Templates such as surface stabilizing molecules and polymers, and hard Templates such as anodic aluminum oxide, mesoporous oxide, carbon nanotubes. NWs prepared from hard Templates are composites of metals and the oxide/carbon matrix. Thus, selecting appropriate elements can simplify the production of composite devices. The resulting NWs are immobilized and spatially arranged, as dictated by the ordered porous structure of the Template. This avoids the NWs from aggregating, which is common for NWs prepared with soft Templates in solution. Herein, the hard Template Synthesis of metal NWs is reviewed, and the resulting structures, properties and potential applications are discussed.
