metal semiconductor transition in carbon nanotubes
Báo cáo hóa học: "Single step process for the synthesis of carbon nanotubes and metal/alloy-filled multiwalled carbon nanotubes" docx
... of RBM, at 388.9 cm–1, in addition to the G- and Dbands The increase in the intensity of D-band for Nifilled MWNTs is due to the non-uniform filling of Ni, resulting in increased degree of disorderness ... the metal- C system Further, reduction in particle size results in lowering of melting temperature [21] According to two widely accepted ‘‘tip-growth’’ and ‘‘root-growth’’ mechanisms, the hydrocarbon ... of carbon nanotubes There could be a further reduction in the catalyst particle size during the hydrogen treatment before the carbon deposition Further, the nickel or iron particles are well interspersed...
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novel hexagonal wo3 nanopowder with metal decorated carbon nanotubes as no2 gas sensor
... was introduced when room temperatures detection of hazardous gases was desired, consisting in embedding a low amount of metal decorated (Ag, Au) carbon nanotubes into the hex-WO3 matrix Indeed, ... Electronics, Electrical and Automatic Engineering, Rovira i Virgili University, Tarragona, Spain His main research interests are in the field of chemical gas sensors, carbon nanotubes and pattern recognition ... stirring the solution in an ultrasonic bath for h at 75 ◦ C The resulting paste was then dropped onto the micromachined silicon membranes by using a microinjector (JBE1113 Dispenser, I&J FISNAR Inc.,...
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cross plane thermoelectric transport in p type la0.67sr0.33mno3 lamno3 oxide metal semiconductor superlattices
... materials exhibit spintronic properties where charges and spin current are intertwined and can generate a spin-Seebeck effect.27,28 Therefore, the observed giant increase in the Seebeck coefficient ... (LSMO) generates spin current These spin currents may be injected into the ferromagnetic semiconductor (LMO) due to lowering of the effective barrier height, which leads to a giant spin-Seebeck effect ... 9(a)) The cylindrical pillar device structures were fabricated using AZ-9260 resist as an etching mask for inductively coupled plasma reactive ion etching (ICP-RIE) (Fig 9(b)) The etching recipe...
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Báo cáo hóa học: " The application of carbon nanotubes in target drug delivery systems for cancer therapies" docx
... thinking Because of the synthesis impairment, acetylcholine is decreased in the neurons in the Alzheimer disease brain, leading to the incapability of learning, memory, and thinking Providing ... targeting of carbon nanotubes in mice Nat Nanotechnol 2007, 2:47-52 56 Liu Z, Tabakman S, Welsher K, Dai H: Carbon nanotubes in biology and medicine in vitro and in vivo detection, imaging and ... considered for obtaining desired treatment effects The studied ways of CNT administration include oral and injections such as subcutaneous injection, abdominal injection, and intravenous injection There...
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Báo cáo hóa học: " Thermal conductivity of carbon nanotubes and graphene in epoxy nanofluids and nanocomposites" pptx
... 81.05.Qk; 81.07.Pr Introduction Due to the increasing importance of energy dissipation in the electronic industry, thermal conductivity of cured epoxy resins has been widely investigated over ... existence of intertube Umklapp scattering processes In addition, SWNTs exhibit a higher number of phonon vibrational modes and a lower defect density in relation to MWNTs, leading to a higher intrinsic ... transferred from the nanotube crystalline structure into the insulating polymer matrix This behavior has already been observed in cured resins [27, 28], but not in the pre-cured state The addition...
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Báo cáo hóa học: " Grafting of 4-(2,4,6-Trimethylphenoxy)benzoyl onto Single-Walled Carbon Nanotubes in Poly(phosphoric acid) via Amide Function" pot
... samples were imbedded in KBr disks Elemental analysis (EA) was performed by using a CE Instruments EA1110 The melting points (mp) were determined on a Mel-Temp melting point apparatus and are ... was conducted both in air and nitrogen atmospheres with a heating rate of 10 °C/min using a Perkin–Elmer TGA7 The field emission scanning electron microscopy (FE-SEM) used in this work was a LEO ... [19] Single-walled carbon nanotubes (SWCNTs, 30–40 wt% 767 purity) were obtained from Hanwha Nanotech Co., LTD, Seoul, Korea (http://hnt.hanwha.co.kr/) Instrumentation Fourier-transform infrared...
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Báo cáo hóa học: "The Influences of H2 Plasma Pretreatment on the Growth of Vertically Aligned Carbon Nanotubes by Microwave Plasma Chemical Vapor Deposition" pptx
... sp2bonded carbon atoms in the two-dimensional hexagonal lattice of the graphite layer In addition, the G-band indicates the degree of crystallinity in the graphite structure, whereas the intensity ... particle sizes of Ni catalyst metal layers treated by H2 plasma etching are about 20–30 nm, which are displayed in the cross-sectional TEM images in Fig It is interesting to note that the geometries ... Amorphous carbon and carbonaceous particles were decreased and denser vertically aligned MWCNTs were obtained for a higher flow rate pretreatment, as shown in Fig In addition, the MWCNTs shown in Fig...
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Báo cáo hóa học: " Multi-Stable Conductance States in Metallic Double-Walled Carbon Nanotubes" ppt
... irregular, having different periodicities in different parts and being asymmetric with VD, which points to a non-ideal Fabry–Perot interference pattern due to minor disorder or inhomogeneity ... inner tubes The continuously switching between two electronic states can be attributed to the locally orientational depinning or melting of a small part of inner tube at certain temperature (TOM, ... conductance Fig Different I–VD curves of a metallic DWCNT recorded around 9.9 K continuously indicate that there are multi-stable conductance states in this tube Inset: Linear conductance of the DWCNT as...
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ENCAPSULATION OF PLATINUM BASED DERIVATIVES WITHIN CARBON NANOTUBES INVESTIGATIONS ON CONTROLLED RELEASE AND IN VIVO BIODISTRIBUTION
... University of Singapore, for kindly providing platinum(IV) compounds, and Prof RAMAPRABHU Sundara, Indian Institute of Technology, Madras, India, for providing ultrapure multi-walled carbon nanotubes ... established a variety of loading strategies, mainly including (a) chemical binding to external surface, (b) π-π stacking on both internal and external surface, (c) encapsulation into inner cavity, etc., ... Chapter Introduction In 2005, Ajima et al first reported the entrapment of CDDP within oxidised singlewalled carbon nanohorns (SWCNHox), finding that the CDDP clusters were maintained inside the...
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First principles studies on the interactions between transition metal atoms, si(001), and nanotubes
... 1.3 Interactions between transition -metal atoms, Si(001), and nanotubes 1.3.1 Interactions of transition -metal atoms with Si(001) 1.3.2 Interactions of transition -metal atoms with nanotubes ... reviewed in Section 1.3 Chapter Introduction 1.3 Interactions between transition -metal atoms, Si(001), and nanotubes 1.3.1 Interactions of transition -metal atoms with Si(001) Transition -metal silicides, ... nanowires These functionalized nanotubes show high spin polarization which is useful in spintronics Finally, the interactions between carbon nanotubes and Si(001) surfaces were investigated through two...
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transition in economic
... more industrial and services products In addition, the population is rising day by day, the demand for industrial products and services increases Increasing in demand for goods requires increasing ... Economic transition toward industrialization, modernization in our country are a quick increase in GDP from industry and services, a decrease in GDP from agriculture at once The process of economic transition ... in 2010, this rate was 49,5% in Viet Nam Labour density in industry and service increased instead Therefore, economic transition happens while a country carries out industrialization and modernization...
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Carbon nanotubes as nanofillers
... Part II Carbon nanotubes as nanofillers Allotropic forms of Carbon Curl, Kroto, Smalley 1985 graphene Iijima 1991 (From R Smalley´s web image gallery) Carbon Nanotubes - Single-wall nanotubes ... Advantages : temperature, the insert gas, pressure, gas flow, catalyst, etc – Insert hydrocarbon gas (C2H2, C2H4, CH4, etc) into quartz tube and obtain Energy insert gas decomposed and CNT ... cohesion between nanotubes nm TEM of SWNTs : axial view Bundle-like aggregation maintained upon melt blending within polymer matrix Bundle-like aggregates EVA + MWNT’s 500 nm The Processing Challenge...
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Tài liệu Báo cáo " Study on reuse of heavy metal rich sludge in ceramic pigment and construction material production " docx
... (%) In further study, heavy metal leaching into rain water with lower pH value and longer soaking time should be investigated; the use of mixing treated sludge with raw material/powder for making ... electroplating waste water treatment system in \ Heavy metal rich sludge Dehydration (dry at room temperature and at 1050C-1100C) Cooling Treating and Grinding Fine screening (d ≤ 0,05 mm) Reuse Fig Diagram ... soaking 3.4 Cost estimation M1 0.3 M2 M3 Concentration (mg/l) 0.25 M4 M5 0.2 M6 0.15 0.1 0.05 0 14 21 Soaking time (day) Fig Concentration of some heavy metals existing in sludge in the rain water...
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Tài liệu Medicinal Chemistry and Pharmacological Potential of Fullerenes and Carbon Nanotubes docx
... studied the binding of pristine fullerene complexed with cyclodextrin on bovine serum albumin protein demonstrating that the binding is a multistep process First, the cyclodextrin dissociation ... the work Printed on acid-free paper springer.com Preface The emerging field of nanotechnology is affirming its increasing importance day by day In this context fullerenes and carbon nanotubes ... experiments in in vitro agarose gel infusion and in vivo infusion in rat brain have been carried out (Fatouros et al., 2006) In this case Gd3N@C80, functionalized with PEG and hydroxyl groups, was examined...
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Tài liệu Báo cáo Y học: Short peptides are not reliable models of thermodynamic and kinetic properties of the N-terminal metal binding site in serum albumin doc
... histidines (His67 and His247, presumably providing metal binding at site II and the neighbouring His242) bind phosphate ions, thereby providing another level of competition for metal ion binding Kinetics ... Ni(II)-albumin complex It would be also interesting to follow the indirect effects of physiologically relevant Ca2+ binding (which occurs at separate sites in the protein [20,21]) on metal ion binding ... presented in Fig For VIHN and DAHam Fig Kinetics of Ni(II) binding to DAHKam and HSA at pH 7.4 in 100 mM phosphate buer Left panel, kinetic plots (d, experimental points constructed by adding intensities...
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CARBON NANOTUBES 2012 pptx
... semiconducting tubules remain semiconducting when the weak interlayer coupling is introduced[l5] More interesting is the case of coaxial metal- semiconductor and semiconductormetal nanotubes, ... on single nanotubes, characterized for their diameter and chirality Interesting effects can be observed in carbon nanotubes for diameters in the range 1-20 nm, depending Physics of carbon nanotubes ... properties of 1D carbon nanotubes are seen to arise predominately from intralayer interactions, rather than from interlayer interactions between multilayers within a single carbon nanotube or...
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The Science and Technology of Carbon Nanotubes potx
... with explicit consideration of carbon- carbon bond-alternation patterns accompanied by the metal- insulator transition inherent in low-dimensional materials including CNT Moreover, recent selective ... 24 metal carbonyl Silica support Sol-gel process 700 Acetylene 25 Co Ultra fine particle Laser etching of Co 1000 Triazine 26 thin film Ultra fine particle Decomposition of 800 Acetylene 24 metal ... with Hamada i indices (40+8k, S+k) with k=0, ,9 In (a), (al) and (a2) the initial stacking at q0 was ABAB whereas in (b), (bl) and (b2) the initial stacking was random (a) The normal incidence pattern...
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Báo cáo " Diffusion behaviour of corrosive solution environments in carbon black filled modified polyethylene linings " doc
... 0.2 0.6 0.5 0.4 0.3 % carbon black loading % carbon black loading % carbon black loading 0.1 (b) 0.7 % carbon black loading 0.2 % carbon black loading % carbon black loading 0.1 0.0 0.0 10 20 ... % carbon black loading 0.2 10 20 30 40 50 Square root of time, (h0.5 ) 60 0.6 % carbon black loading % carbon black loading % carbon black loading 0.2 0.0 0.8 0.4 % carbon black loading % carbon ... Weight change, % 0.7 % carbon black loading % carbon black loading 0.5 0.4 0.3 (b) 0.5 0.4 0.3 0.2 % carbon black loading 0.2 (a) 0.1 % carbon black loading % carbon black loading 0.1 0.0 0.0 0 10...
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CARBON NANOTUBES ppt
... semiconducting tubules remain semiconducting when the weak interlayer coupling is introduced[l5] More interesting is the case of coaxial metal- semiconductor and semiconductormetal nanotubes, ... on single nanotubes, characterized for their diameter and chirality Interesting effects can be observed in carbon nanotubes for diameters in the range 1-20 nm, depending Physics of carbon nanotubes ... properties of 1D carbon nanotubes are seen to arise predominately from intralayer interactions, rather than from interlayer interactions between multilayers within a single carbon nanotube or...
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A review of heavy metal removal mechanisms in wetlands
... heavy metals from cobalt tailings stockpiled as result of copper mining upstream at Kilembe mines prevented heavy metals from reaching the lake This in turn prevented heavy metals from accumulating ... name phytochelatins Phytochelatins are heavy metal complexing peptides composed of different amino acids (r- glutamic acid - cysteine)n - glycine n = to 7, which are involved in detoxication ... including humic, tannic and fulvic acids (HA, TA, & FA) An understanding of heavy metal organic interactions is therefore important in developing realistic models for heavy metal speciation in...
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