Coupled ZnO/TiO2 Nanorods Deposited in the Pores of Expanded Graphite Prepared by Microwave Irradiation

2011 ◽  
Vol 204-210 ◽  
pp. 268-272
Author(s):  
Min Cong Zhu ◽  
En Qiang Wang ◽  
Ying Chen Zhang ◽  
Deng Xin Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Microwave Irradiation ◽  
Expanded Graphite ◽  
Hydrolysis Method ◽  
Catalytic Nanoparticles ◽  
Key Factor ◽  
Temperature And Pressure ◽  
Harsh Conditions ◽  
Scanning Electron

Expanded graphite (EG) was prepared by microwave irradiation at 1000W for 60s. The growth of coupled ZnO/TiO2nanonods in the pores of EG by using hydrolysis method without harsh conditions was investigated and their microstructure was studied by scanning electron microscopy (SEM). Results show that pores of EG, which can load catalytic nanoparticles, is the physical base for growth of catalytic nanorods. The active edges of graphene of freshly EG is a key factor for the growth of coupled ZnO/TiO2nanorods under non-catalytic and normal temperature and pressure conditions.

Preparation of Expanded Graphite Using Recycling Graphite Rods by Microwave Irradiation

2012 ◽  
Vol 610-613 ◽  
pp. 2356-2360
Author(s):  
Hong Liang Hua ◽  
Yun Wang ◽  
Yu Jia Wang ◽  
Shi Jun Ruan ◽  
Chao Zeng ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Potassium Dichromate ◽  
Expanded Graphite ◽  
Chemical Oxidation ◽  
Raw Material ◽  
Expandable Graphite ◽  
Graphite Rods ◽  
Scanning Electron

After washing, milling and calcining, the graphite rods recycled from waste dry batteries were used as raw material to prepare expandable graphite by chemical oxidation (using acetic anhydride as inserting and potassium dichromate as oxidant), the expanded graphite was prepared from the obtained expandable graphite by microwave radiation (MW) at 1000W for 60s.The characterization of infrared spectroscopy (IR) and scanning electron microscopy (SEM) of obtained expanded graphite have been discussed. The results show that it is feasible to prepare expanded graphite using graphite rods recycled from waste dry batteries.

A rapid fixation method for transmission and Scanning Electron Microscopy using microwave irradiation

1990 ◽  
Vol 48 (3) ◽  
pp. 760-761
Author(s):  
Yasuaki Hotta ◽  
Masumi Nozaki ◽  
Nobuhiko Honda ◽  
Hiroyuki Kato ◽  
Ying Wei Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Microwave Irradiation ◽  
Phosphate Buffer Solution ◽  
Male Rats ◽  
Fixation Method ◽  
Buffer Solution ◽  
Wistar Strain ◽  
Microwave Fixation ◽  
Scanning Electron

Recently, the validity of microwave irradiation (MWI) for electron microscopy has attracted special interest especially in Japan. Recently, we developed a new maceration method for scanning electron microscopy (microwave maceration) and a rapid polymerization method for tissue embedding using epoxy resin (microwave polymerization). Concerning the tissue fixations using MWI (microwave fixation), there are many problems which are not yet clear. In this study, we intend to reveal the effectiveness and mechanism of microwave fixation for scanning and transmission electron mi c roscopy.Liver and trachea taken from Wistar strain male rats were used in this experiment. The fresh livers and tracheae were cut into small pieces and microwave irradiated using a microwave processor (H2500, Bio-Rad) for 1 or 3 min in 2.5% g1utara 1dehyde (GL) bufferized fixatives regulated at pH 7.3 with 0.1M phosphate buffer solution. To prevent the rising of temperature during MWI, specially designed metal case containing water and ice was used (Fig.1).

scholarly journals Thermal Conductivity of Polyimide/Carbon Nanofiller Blends

2007 ◽  
Vol 334-335 ◽  
pp. 749-752 ◽  
Author(s):  
Subrata Ghose ◽  
K.A. Watson ◽  
D.M. Delozier ◽  
D.C. Working ◽  
John W. Connell ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Scanning Electron Microscopy ◽  
Tensile Testing ◽  
Expanded Graphite ◽  
Multiwalled Carbon ◽  
Carbon Nanofiller ◽  
Scanning Electron

In efforts to improve the thermal conductivity (TC) of Ultem™ 1000, it was compounded with three carbon based nano-fillers. Multiwalled carbon nanotubes (MWCNT), vapor grown carbon nanofibers (CNF) and expanded graphite (EG) were investigated. Ribbons were extruded to form samples in which the nano-fillers were aligned. Samples were fabricated by compression molding where the nano-fillers were randomly oriented. The thermal properties were evaluated by DSC and TGA, and the mechanical properties of the aligned samples were determined by tensile testing. The degree of dispersion and alignment of the nanoparticles were investigated with high-resolution scanning electron microscopy. The thermal conductivity was measured in two directions using the Nanoflash technique.

Fabricating TiO2 Coated ZnO Nanowire Array/Graphene Heterostructure

2012 ◽  
Vol 430-432 ◽  
pp. 45-48
Author(s):  
Yong Qiang He ◽  
Si Yao He ◽  
Na Na Zhang ◽  
Wen Chao Wang ◽  
Hong Sun ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Zno Nanoparticles ◽  
Nanowire Array ◽  
Precursor Solution ◽  
Zno Nanowire ◽  
Reaction Conditions ◽  
Graphene Surface ◽  
Hydrolysis Method ◽  
Scanning Electron

ZnO nanowire array supported on the graphene surface was fabricated by thermo hydrolysis method. The ZnO nanoparticles (seed crystals) were first deposited on GO surface and then ZnO nanoparticles grew to ZnO nanowire array when the seed crystal side was hung upside down and touched with ZnO precursor solution during the process of thermo hydrolysis. The ZnO nanowire array was then coated with TiO2 precursor, hydrolyzed and turned to crystalline TiO2. The formed ZnO/TiO2/graphene composites have different structure depending on the reaction conditions and their morphology was observed with scanning electron microscopy.

Preparation of the EG/TiO2 Composites in the Method of Impregnation

2011 ◽  
Vol 474-476 ◽  
pp. 792-796
Author(s):  
Li Qin Wang ◽  
Xiang Ni Yang ◽  
Xiu Li Zhao ◽  
Rui Jun Zhang ◽  
Yu Lin Yang
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Methyl Orange ◽  
Lamellar Structure ◽  
Expanded Graphite ◽  
X Ray ◽  
Ft Ir ◽  
Scanning Electron

The composites of expanded graphite with TiO2(EG/TiO2) were prepared in the method of impregnation, the morphology and crystal structure were characterized by the means of scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The decolorization performance of the EG/TiO2composites for the methyl orange aqueous solution were studied. The experimental results were shown as follows: the EG/TiO2composites maintained the porous and lamellar structure of EG, and a lot of anatase TiO2particles as a small lumpdistributed on surfaces and in layers of EG. The composites may contain the graphite both oxidized and un-oxidized, and there was no other organic group left in the composites, except for the functional groups of graphite. Moreover, the EG/TiO2composites had excellent decolorization performance for the methyl orange aqueous solution. When reacted for 90 min, the decolorization rate of the methyl orange aqueous solution was at the peak, up to 96.1%. We supposed that it was mainly due to the interaction between the strong adsorptive ability of EG and the degradation property of TiO2particles.

Tannin-ferrocyanide OsO4 method for scanning electron microscopy with use of microwave irradiation

1990 ◽  
Vol 48 (3) ◽  
pp. 26-27
Author(s):  
Gen Takahashi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Resolution ◽  
Microwave Irradiation ◽  
Heat Generation ◽  
Light And Electron Microscopy ◽  
Staining Methods ◽  
Metal Decoration ◽  
Time Required ◽  
Scanning Electron

The disadvantages of metal-coating techniques in high resolution SEM are limitation of resolution due to the thickness of coating, metal decoration of the surface ultrastructures, the lack of uniformity and continuity of coating or specimen damage during coating due to heat generation. In order to overcome these disadvantages and to obtain the better ultrastructural preservation after drying of specimens, the conductive staining methods have been devised.˜4The microwave irradiation(MWI) has recently been used for fixation of biological specimens for light and electron microscopy, immunohistochemistry and for acceleration of the time required for tissue processing and staining. In the present study, MWI can be successfully applied to each step in the tannin- ferrocyanide-OsO4(TA- FeCN-Os) method for high resolution SEM.The TA- FeCNsOs method for high resolution SEM [A] Primary Osmication(Fixation): double fixation with glutaraldehyde-paraformaldehyde and OsO4, TA-FeCN-Os method for TEM,Osmium-DMSO-Osmium, prolonged osmication or osmication after extraction with saponin, glycerol or detergents.

Performance of alternate superheater materials in a potassium-rich recovery boiler environment

TAPPI Journal ◽  
2013 ◽  
Vol 12 (7) ◽  
pp. 45-56 ◽  
Author(s):  
JAMES R. KEISER ◽  
W.B.A. SANDY SHARP ◽  
DOUGLAS A SINGBEIL ◽  
LAURIE A. FREDERICK ◽  
CURTIS CLEMMONS
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Melting Point ◽  
Corrosion Rates ◽  
Superheater Tube ◽  
Boiler Environment ◽  
Temperature And Pressure ◽  
Recovery Boiler ◽  
Multiple Samples ◽  
Scanning Electron

One method to significantly improve the efficiency of biomass-fired boilers is to increase the temperature and pressure of the steam generated. However, this requires operating the superheater tubes at considerably higher temperatures than can be tolerated by conventional structural materials. The limiting temperature for conventional materials is primarily determined by corrosion of the superheater tubes that is promoted by interaction with the relatively low melting point deposits that accumulate on the tubes. An air-cooled deposit probe was used to collect samples of the deposits that accumulated on tubes in the superheater area of a recovery boiler in a mill processing primarily hardwood. These deposits were found to be enriched in potassium. Subsequently, a corrosion probe containing multiple samples of nine different alloys was exposed for 2000 h in the same location of the superheater area of the same recovery boiler. The temperature of samples in the probe ranged from a low of about 400°C (752°F) to temperatures above 620°C (1148°F), compared to the boiler’s estimated maximum tube temperature of 470°C (878°F). Following exposure, sections were taken from each of the 30 samples and examined using light microscopy and scanning electron microscopy. Results of the examination of these samples showed significant differences among the corrosion rates at temperatures 100°C above the current upper superheater tube temperature. A brief comparison is made to data from a parallel laboratory study.

Coagulation Method for Preparing Antimony-Doped Tin Oxide (ATO)/Poly(methyl Methacrylate) Nanocomposites and their Electrical Conductivity and Thermal Stability

2011 ◽  
Vol 194-196 ◽  
pp. 610-613 ◽  
Author(s):  
Bing Hai Dong ◽  
Tao Jiang ◽  
Zu Xun Xu ◽  
Hong Bing Lu ◽  
Shi Min Wang
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Electrical Conductivity ◽  
Scanning Electron Microscopy ◽  
Methyl Methacrylate ◽  
Polymer Matrix ◽  
Tin Oxide ◽  
Poly Methyl Methacrylate ◽  
Key Factor ◽  
Scanning Electron

A coagulation method providing a better dispersion of nano-Antimony-Doped Tin Oxide (ATO) in a polymer matrix was used to produce nano-ATO/poly(methyl methacrylate) (PMMA) composites. Scanning electron microscopy showed an improved dispersion of nano-ATO in the PMMA matrix, which is a key factor to determine the composite performance. Moreover, the PMMA with the addition of nano-ATO showed improved electrical conductivity and thermal stability.

Nanoporous Graphite Materials Produced by Ball-Milling Expanded Graphite

2014 ◽  
Vol 552 ◽  
pp. 324-327
Author(s):  
Hua Wang ◽  
Xue Qing Yue ◽  
He Wei Fu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ball Milling ◽  
Expanded Graphite ◽  
High Energy ◽  
Air Atmosphere ◽  
Scanning Electron

Expanded graphite was ball-milled for 80 h in a high-energy mill (planetary-type) under an air atmosphere. The products were characterized by scanning electron microscopy. The results show that ball-milling EG produces nanoporous graphite powders.

The Synthesis of Polycrystalline Chalcopyrite Semiconductors by Microwave Irradiation

1993 ◽  
Vol 327 ◽  
Author(s):  
Christopher C. Landry ◽  
Andrew R. Barron
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Morphology ◽  
Microwave Irradiation ◽  
Photoelectron Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Edx Analysis ◽  
Chalcopyrite Semiconductors ◽  
Scanning Electron

AbstractPolycrystalline samples of the chalcopyrites CuInS2, CuInSe2, AgInS2, and AgInSe2 have been prepared from stoichiometric mixtures of the pure elements using microwave irradiation. The reactions were performed in sealed quartz tubes in as few as three minutes. The products were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, and X-ray photoelectron spectroscopy (XPS). The surface morphology and shape of the particles produced by this method suggests that the products are formed from liquid melts.

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