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RISS 인기검색어
- 검색키워드
- 저자 : T. Kemmitt (검색결과 4 건)
- 무료
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- 유료
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Photocatalytic titania coatings
T. Kemmitt,N. I. Al-Salim,M. Waterland,V. J. Kennedy,A. Markwitz 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
Thin coatings of titania and titania/silica were deposited onto aluminium and anodised aluminium substrates from an aqueous precursor. The titania precursor sol was prepared using a proprietary method, and applied onto cleaned or polished substrates by spray coating. Two-stage heat processing at 160 and up to 650 C densified and crystallised the film. Crack-free, transparent coatings up to 1.00 lm thickcan be produced from a single application using this precursor system. X-ray diffraction was used to identify the crystal phase of the films as anatase, and resonant nuclear reaction (RNRA) experiments were carried out to assess the degree of aluminium migration from the aluminium substrates into the films. Photocatalytic oxidation of an organic dye on the surface was monitored by a novel fluorescence method. Water droplet contact angles were measured on the film surfaces before and after UV illumination to investigate the photoactivated hydrophilicity of the films. The activities were compared with films prepared on glass and ceramic substrates.
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High temperature superconductor films and devices for the microwave communication industry
N. J. Long,J. Joubert,T. Kemmitt,L. J. Campbell,A. J. Bubendorfer 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
High temperature superconductor (HTS) thin lms can be used to construct microwave devices such as lters and antennas withsuperior performance. We show how the lms can be manufactured using a solgel method which has the advantage of being able toproduce large area lms quickly, at low cost on simple equipment. We have developed a solgel precursor which has the additionalbenets of using commonly available non-toxic reagents, and which can be prepared quickly. HighTc and high Jc lms have beenmade with this precursor. These lms can be patterned to make microwave lters with better sensitivity and selectivity than con-ventional lters. Adesignfora microstriplayout ofaquasi-elliptic bandpass filter which can be implemented ona10 m×10mm film is described. Simulated results comparing lter implementations with metal and superconductor films operating at 77 K are given.
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Structural and thermal characterisation of nanostructured alumina templates
I.W.M. Brown,M.E. Bowden,T. Kemmitt,K.J.D. MacKenzie 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Nanostructured anodic aluminium oxide materials containing a two dimensional array of high aspect ratio aligned pores of 200 nm.C. Thermal analysis shows two discrete irreversible exothermic eventsat 850.C and 1020 .C. XRD and27Al MAS NMR show the progressive development of local and long range order in the heated struc-tures and indicate a reaction sequence of amorphous Al2O3 ! h-Al2O3 ! a-Al2O3 (corundum). NMR shows the co-existence of alumin-ium in 4, 5 and 6-coordinated sites through most of the heating sequence until the stable (6-coordinated) corundum phase is established.Phosphorus impurities incorporated during the membrane fabrication process crystallise as an AlPO4 phase above 850 .C and play animportant role in directing the chemical, physical and structural outcomes of the heat treatment.
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A. Kirchner,I.W.M. Brown,M.E. Bowden,T. Kemmitt,G. Smith 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Porous anodic alumina discs supporting palladium lms as elements of hydrogen-purifying membranes have been examined for theirhigh-temperature behaviour. The method employed to fabricate the porous alumina support is the so-called ‘hard anodising’ technique,which oers substantially higher growth rates while producing mechanically robust lms. These alumina membranes were found to pos-sess a thermal stability better than commercial Anopore. membranes. Upon long-term exposure at 800.C they transform intoc-aluminawithout major deformation. Ultra-thin palladium lms deposited across the alumina pores by physical vapour deposition are continuousand stable in reducing atmospheres to at least 700.C but are oxidised and destroyed by heating in air.
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