The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Jianguo Guan - One of the best experts on this subject based on the ideXlab platform.
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Single Component tio2 tubular microengines with motion controlled by light induced bubbles
Small, 2015Co-Authors: Yan Li, Chuanrui Chen, Wei Li, Jianguo GuanAbstract:: In this work, light-controlled bubble-propelled Single-Component metal oxide tubular microengines have for the first time been demonstrated. For such a simple Single-Component TiO2 tubular microengine in H2O2 aqueous solution under UV irradiation, when the inner diameter and length of the tube are regulated, the O2 molecules will nucleate and grow into bubbles preferentially on the inner concave surface rather than on the outer surface, resulting in a vital propulsion of the microengine. More importantly, the motion state and speed can be modulated reversibly, fast (the response time is less than 0.2 s) and wirelessly by adjusting UV irradiation. Consequently, the as-developed TiO2 tubular microengine promises potential challenged applications related to photocatalysis, such as "on-the-fly" photocatalytic degradation of organic pollutes and photocatalytic inactivation of bacteria due to the low cost, Single Component, and simple structure, as well as the facile fabrication in a large-scale.
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Single‐Component TiO2 Tubular Microengines with Motion Controlled by Light‐Induced Bubbles
Small, 2015Co-Authors: Yan Li, Chuanrui Chen, Wei Li, Huiru Ma, Jianguo GuanAbstract:In this work, light-controlled bubble-propelled Single-Component metal oxide tubular microengines have for the first time been demonstrated. For such a simple Single-Component TiO2 tubular microengine in H2O2 aqueous solution under UV irradiation, when the inner diameter and length of the tube are regulated, the O2 molecules will nucleate and grow into bubbles preferentially on the inner concave surface rather than on the outer surface, resulting in a vital propulsion of the microengine. More importantly, the motion state and speed can be modulated reversibly, fast (the response time is less than 0.2 s) and wirelessly by adjusting UV irradiation. Consequently, the as-developed TiO2 tubular microengine promises potential challenged applications related to photocatalysis, such as "on-the-fly" photocatalytic degradation of organic pollutes and photocatalytic inactivation of bacteria due to the low cost, Single Component, and simple structure, as well as the facile fabrication in a large-scale.
Hayao Kobayashi - One of the best experts on this subject based on the ideXlab platform.
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Molecular design and development of Single-Component molecular metals
Journal of Materials Chemistry, 2020Co-Authors: Akiko Kobayashi, Hisashi Tanaka, Hayao KobayashiAbstract:This article discusses the requirements for designing Single Component molecular metals, derived from the results of crystal structure analyses, electrical resistivity measurements and extended Huckel tight-binding band calculations, performed on molecular conductors composed of Single-Component molecules of [Ni(ptdt)2] (ptdt = propylenedithiotetrathiafulvalenedithiolate) with extended TTF-ligands. The design of π molecules with a small HOMO–LUMO gap and a TTF-like skeleton is a key step to developing Single-Component molecular metals. A new approach is proposed to reduce HOMO–LUMO gaps. The preparation and characterization of a Single-Component three-dimensional molecular metal based on an analogous neutral transition metal complex molecule, [Ni(tmdt)2] (tmdt = trimethylenetetrathiafulvalenedithiolate) are reported. The details of the procedures for its synthesis are presented. Black crystals of this compound were obtained by the electrochemical method. In the crystal, which has a triclinic unit cell containing only one molecule, the planar [Ni(tmdt)2] molecules are closely packed to form the lattice plane (02). There are intermolecular short S⋯S contacts which indicate that the system is a three-dimensional conductor. The resistivity measurements show that the system is metallic down to 0.6 K. The extended Huckel tight-binding band calculation gave three-dimensional semi-metallic Fermi surfaces. A metallic crystal was also prepared with an analogous molecule [Ni(dmdt)2] (dmdt = dimethyltetrathiafulvalenedithiolate). The formation of a Single Component molecular metal opens the possibilities of developing various types of unprecedented functional molecular systems such as Single Component molecular superconductors, ferromagnetic metals composed of Single Component magnetic molecules, molecular metals (or superconductors) soluble in organic solvent, etc.
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A Single-Component Molecular Superconductor
Journal of the American Chemical Society, 2014Co-Authors: Hayao Kobayashi, Masaaki Sasa, Shoji Ishibashi, Fumitatsu Iwase, Reizo Kato, Akiko KobayashiAbstract:The pressure dependence of the resistivities of a Single-Component molecular conductor, [Ni(hfdt)2] (hfdt = bis(trifluoromethyl)tetrathiafulvalenedithiolate) with semiconducting properties at ambient pressure was examined. The four-probe resistivity measurements were performed up to ∼10 GPa using a diamond anvil cell. The low-temperature insulating phase was suppressed above 7.5 GPa and the resistivity dropped, indicating the superconducting transition occurred around 7.5–8.7 GPa with a maximum Tc (onset temperature) of 5.5 K. The high-pressure crystal and electronic band structures were derived by the first-principle calculations at 6–11 GPa. The crystal was found to retain the semiconducting band structure up to 6 GPa. But the electron and hole Fermi surfaces appear at 8 GPa. These results of the calculations agree well with the observation that the pressure-induced superconducting phase of [Ni(hfdt)2] appeared just above the critical pressure where the low-temperature insulating phase was suppressed.
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Single-Component Molecular Conductors
Molecular Crystals and Liquid Crystals, 2006Co-Authors: Akiko Kobayashi, Hayao KobayashiAbstract:The novel nickel complex with the extended-TTF dithiolate ligand [Ni(tmdt)2](tmdt = trimethylenedithiotetrathiafulvalenedithiolate) is the first Single-Component molecular crystal with metallic state down to very low temperature. Recently, a direct evidence for the presence of three-dimensional electron and hole Fermi surfaces was obtained by detecting de Haars-van Alphen (dHvA) oscillations of this system. An isostructural highly conducting [Au(tmdt)2] system (σ(RT) ≈ 50 S cm−1 (compaction pellet sample)) undergoes an antiferromagnetic transition around 110 K without loss of its high conductivity (σ(110K) > 20 S cm−1). [Au(tmdt)2] is the first molecular conductor exhibiting the coexistence of π conduction electrons and magnetic order above 100 K.
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Molecular design and physical properties of Single-Component molecular metals
Journal of the Physical Society of Japan, 2006Co-Authors: Akiko Kobayashi, Yoshinori Okano, Hayao KobayashiAbstract:The design of metallic crystals consisting of Single-Component molecules ( Single-Component molecular metal ) is explained on the basis of the examinations of frontier molecular orbitals and the simple extended-Huckel tight-binding band pictures. To meet the conditions required to realize automatic carrier generation by self-assembly of the same kind of neutral molecules, a crystal of a transition metal complex molecule [Ni(tmdt) 2 ] with extended-TTF-type (TTF = tetrathiafulvalene) dithiolate ligands was synthesized, which was found to be the first Single-Component molecular metal. The X-ray structure analyses of the crystals of [(C 4 H 9 ) 4 N] 2 [Ni(tmdt) 2 ] and neutral [Ni(tmdt) 2 ] provided information on the symmetry of the frontier molecular orbitals [the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO)] from which the metallic bands are formed. The infrared and visible spectra of a crystalline powder sample of [Ni(tmdt) 2 ] showed a broad electronic abs...
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Development of metallic crystals composed of Single-Component molecules
Journal of Materials Chemistry, 2005Co-Authors: Akiko Kobayashi, Biao Zhou, Hayao KobayashiAbstract:The novel nickel complex with the extended TTF dithiolate ligand [Ni(tmdt)2] (tmdt = trimethylenetetrathiafulvalenedithiolate) is the first three-dimensional Single-Component molecular metal with metallic state down to 0.6 K. The isostructural new molecular conductor [Au(tmdt)2] exhibited an unprecedentedly high-temperature antiferromagnetic transition around 85 K without loss of its high conductivity.
Akiko Kobayashi - One of the best experts on this subject based on the ideXlab platform.
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Molecular design and development of Single-Component molecular metals
Journal of Materials Chemistry, 2020Co-Authors: Akiko Kobayashi, Hisashi Tanaka, Hayao KobayashiAbstract:This article discusses the requirements for designing Single Component molecular metals, derived from the results of crystal structure analyses, electrical resistivity measurements and extended Huckel tight-binding band calculations, performed on molecular conductors composed of Single-Component molecules of [Ni(ptdt)2] (ptdt = propylenedithiotetrathiafulvalenedithiolate) with extended TTF-ligands. The design of π molecules with a small HOMO–LUMO gap and a TTF-like skeleton is a key step to developing Single-Component molecular metals. A new approach is proposed to reduce HOMO–LUMO gaps. The preparation and characterization of a Single-Component three-dimensional molecular metal based on an analogous neutral transition metal complex molecule, [Ni(tmdt)2] (tmdt = trimethylenetetrathiafulvalenedithiolate) are reported. The details of the procedures for its synthesis are presented. Black crystals of this compound were obtained by the electrochemical method. In the crystal, which has a triclinic unit cell containing only one molecule, the planar [Ni(tmdt)2] molecules are closely packed to form the lattice plane (02). There are intermolecular short S⋯S contacts which indicate that the system is a three-dimensional conductor. The resistivity measurements show that the system is metallic down to 0.6 K. The extended Huckel tight-binding band calculation gave three-dimensional semi-metallic Fermi surfaces. A metallic crystal was also prepared with an analogous molecule [Ni(dmdt)2] (dmdt = dimethyltetrathiafulvalenedithiolate). The formation of a Single Component molecular metal opens the possibilities of developing various types of unprecedented functional molecular systems such as Single Component molecular superconductors, ferromagnetic metals composed of Single Component magnetic molecules, molecular metals (or superconductors) soluble in organic solvent, etc.
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A Single-Component Molecular Superconductor
Journal of the American Chemical Society, 2014Co-Authors: Hayao Kobayashi, Masaaki Sasa, Shoji Ishibashi, Fumitatsu Iwase, Reizo Kato, Akiko KobayashiAbstract:The pressure dependence of the resistivities of a Single-Component molecular conductor, [Ni(hfdt)2] (hfdt = bis(trifluoromethyl)tetrathiafulvalenedithiolate) with semiconducting properties at ambient pressure was examined. The four-probe resistivity measurements were performed up to ∼10 GPa using a diamond anvil cell. The low-temperature insulating phase was suppressed above 7.5 GPa and the resistivity dropped, indicating the superconducting transition occurred around 7.5–8.7 GPa with a maximum Tc (onset temperature) of 5.5 K. The high-pressure crystal and electronic band structures were derived by the first-principle calculations at 6–11 GPa. The crystal was found to retain the semiconducting band structure up to 6 GPa. But the electron and hole Fermi surfaces appear at 8 GPa. These results of the calculations agree well with the observation that the pressure-induced superconducting phase of [Ni(hfdt)2] appeared just above the critical pressure where the low-temperature insulating phase was suppressed.
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Single-Component Molecular Conductors
Molecular Crystals and Liquid Crystals, 2006Co-Authors: Akiko Kobayashi, Hayao KobayashiAbstract:The novel nickel complex with the extended-TTF dithiolate ligand [Ni(tmdt)2](tmdt = trimethylenedithiotetrathiafulvalenedithiolate) is the first Single-Component molecular crystal with metallic state down to very low temperature. Recently, a direct evidence for the presence of three-dimensional electron and hole Fermi surfaces was obtained by detecting de Haars-van Alphen (dHvA) oscillations of this system. An isostructural highly conducting [Au(tmdt)2] system (σ(RT) ≈ 50 S cm−1 (compaction pellet sample)) undergoes an antiferromagnetic transition around 110 K without loss of its high conductivity (σ(110K) > 20 S cm−1). [Au(tmdt)2] is the first molecular conductor exhibiting the coexistence of π conduction electrons and magnetic order above 100 K.
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Molecular design and physical properties of Single-Component molecular metals
Journal of the Physical Society of Japan, 2006Co-Authors: Akiko Kobayashi, Yoshinori Okano, Hayao KobayashiAbstract:The design of metallic crystals consisting of Single-Component molecules ( Single-Component molecular metal ) is explained on the basis of the examinations of frontier molecular orbitals and the simple extended-Huckel tight-binding band pictures. To meet the conditions required to realize automatic carrier generation by self-assembly of the same kind of neutral molecules, a crystal of a transition metal complex molecule [Ni(tmdt) 2 ] with extended-TTF-type (TTF = tetrathiafulvalene) dithiolate ligands was synthesized, which was found to be the first Single-Component molecular metal. The X-ray structure analyses of the crystals of [(C 4 H 9 ) 4 N] 2 [Ni(tmdt) 2 ] and neutral [Ni(tmdt) 2 ] provided information on the symmetry of the frontier molecular orbitals [the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO)] from which the metallic bands are formed. The infrared and visible spectra of a crystalline powder sample of [Ni(tmdt) 2 ] showed a broad electronic abs...
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Development of metallic crystals composed of Single-Component molecules
Journal of Materials Chemistry, 2005Co-Authors: Akiko Kobayashi, Biao Zhou, Hayao KobayashiAbstract:The novel nickel complex with the extended TTF dithiolate ligand [Ni(tmdt)2] (tmdt = trimethylenetetrathiafulvalenedithiolate) is the first three-dimensional Single-Component molecular metal with metallic state down to 0.6 K. The isostructural new molecular conductor [Au(tmdt)2] exhibited an unprecedentedly high-temperature antiferromagnetic transition around 85 K without loss of its high conductivity.
Karabi Biswas - One of the best experts on this subject based on the ideXlab platform.
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Packaging of Single-Component Fractional Order Element
IEEE Transactions on Device and Materials Reliability, 2013Co-Authors: Debasmita Mondal, Karabi BiswasAbstract:In this paper, packaging issue of a Single-Component fractional order element (FOE) is presented. Packaging is required for better longevity and miniaturization of dimensions. In addition, it helps in fabrication of a Single-Component FOE as a discrete element similar to the existing passive circuit elements. An alternate electrode (platinized silicon) for fabricating Single-Component FOE other than the existing copper electrode has been proposed for the first time in this paper. A comparative analysis has been carried out between the performances of packaged FOEs using copper and platinized silicon electrodes.
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Performance study of fractional order integrator using Single-Component fractional order element
IET Circuits Devices & Systems, 2011Co-Authors: Debasmita Mondal, Karabi BiswasAbstract:A Single-Component fractional order element (FOE) is realised and its performance is compared with the conventional FOEs such as cross resistance-capacitance (RC) ladder network and domino ladder network in the analogue domain. The Single-Component FOE is a capacitive-type probe coated with a porous film of poly-methyl-methacrylate (PMMA) and is dipped in polarisable medium. The fractional exponent of the fabricated Single-Component FOE and domino ladder can be varied between 0 and 1 whereas that of cross RC ladder realised in this work is 1/2. The performance of fractional order integrator (FOI) using these FOEs is studied in both frequency and time domain by simulation and experimentation. A comparative analysis of the performance of FOI is carried out.
Yan Li - One of the best experts on this subject based on the ideXlab platform.
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Single Component tio2 tubular microengines with motion controlled by light induced bubbles
Small, 2015Co-Authors: Yan Li, Chuanrui Chen, Wei Li, Jianguo GuanAbstract:: In this work, light-controlled bubble-propelled Single-Component metal oxide tubular microengines have for the first time been demonstrated. For such a simple Single-Component TiO2 tubular microengine in H2O2 aqueous solution under UV irradiation, when the inner diameter and length of the tube are regulated, the O2 molecules will nucleate and grow into bubbles preferentially on the inner concave surface rather than on the outer surface, resulting in a vital propulsion of the microengine. More importantly, the motion state and speed can be modulated reversibly, fast (the response time is less than 0.2 s) and wirelessly by adjusting UV irradiation. Consequently, the as-developed TiO2 tubular microengine promises potential challenged applications related to photocatalysis, such as "on-the-fly" photocatalytic degradation of organic pollutes and photocatalytic inactivation of bacteria due to the low cost, Single Component, and simple structure, as well as the facile fabrication in a large-scale.
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Single‐Component TiO2 Tubular Microengines with Motion Controlled by Light‐Induced Bubbles
Small, 2015Co-Authors: Yan Li, Chuanrui Chen, Wei Li, Huiru Ma, Jianguo GuanAbstract:In this work, light-controlled bubble-propelled Single-Component metal oxide tubular microengines have for the first time been demonstrated. For such a simple Single-Component TiO2 tubular microengine in H2O2 aqueous solution under UV irradiation, when the inner diameter and length of the tube are regulated, the O2 molecules will nucleate and grow into bubbles preferentially on the inner concave surface rather than on the outer surface, resulting in a vital propulsion of the microengine. More importantly, the motion state and speed can be modulated reversibly, fast (the response time is less than 0.2 s) and wirelessly by adjusting UV irradiation. Consequently, the as-developed TiO2 tubular microengine promises potential challenged applications related to photocatalysis, such as "on-the-fly" photocatalytic degradation of organic pollutes and photocatalytic inactivation of bacteria due to the low cost, Single Component, and simple structure, as well as the facile fabrication in a large-scale.