Browsing by Subject "Composition effects"

Article

Deposition and characterisation of TiAlBN coatings produced by direct electron-beam evaporation of Ti and Ti-Al-B-N material from a twin crucible source

Rebholz, Claus; Leyland, A.; Matthews, A. (1999)

TiAlBN coatings were synthesised by evaporating Ti and hot isostatically pressed TiAl0.68B3.67N2.44 material from a twin crucible source in an Ar plasma at 450°C. A combination of optical emission spectroscopy and partial ...

Conference Object

Doping and alloying trends in new thermoelectric materials

Loo, S.; Lal, S.; Kyratsi, Theodora; Chung, D. Y.; Hsu, K. F.; Kanatzidis, M. G.; Hogan, T. P. (Affiliation: Dept. of Elec. and Comp. Engineering, Michigan State University, East Lansing, MI, United StatesCorrespondence Address: Loo, S.Dept. of Elec. and Comp. Engineering, Michigan State University, East Lansing, MI, United States, 2002)

New thermoelectric bulk materials such as CsBi4Te6 have shown superior properties to traditional materials, however, optimal performance requires continuing investigations of doping and alloying trends. A recently modified ...

Article

The effect of boron additions on the tribological behaviour of TiN coatings produced by electron-beam evaporative PVD

Rebholz, Claus; Leyland, A.; Larour, P.; Charitidis, C.; Logothetidis, S.; Matthews, A. (1999)

TiN coatings containing small amounts of boron were synthesized by electron beam evaporating a Ti-B alloy material from a single crucible source into a plasma comprising Ar or an Ar/N2 mixture at a substrate temperature ...

Article

The effect of sorbed toluene on the surface properties of calcium hydroxide

Pashalidis, Ioannis; Theocharis, Charis R. (1998)

The surface properties of commercial grade calcium hydroxide were studied by nitrogen adsorption isotherm analysis, FTIR spectroscopy (KBr transmission and reflectance) and TGA analysis before and after toluene adsorption. ...

Article

Effects of W6+ doping of TiO2 on the reactivity of supported Rh toward NO: Transient FTIR and mass spectroscopy studies

Chafik, T.; Efstathiou, Angelos M.; Verykios, Xenophon E. (1997)

The transient adsorption and dissociation of NO over Rh supported on undoped and W6+-doped TiO2 in the temperature range of 25-450°C has been studied by FTIR and mass spectroscopy. It was found that at 25 °C three kinds ...

Article

Hall effect in detwinned single crystals of YBa2(Cu1-xZnx)3O7-δ in the mixed state

Schegolev, A. I.; Giapintzakis, John; Manson, J. T.; Ginsberg, D. M.; Dumler, I. (1996)

The effect of zinc doping on the mixed-state Hall effect in detwinned single crystals of YBa2Cu3O7-δ has been studied. We observe a sign reveral of the Hall effect in crystals with a superconducting transition temperature ...

Article

Near-monodisperse, catalytically active, imidazole-containing homooligomers: Synthesis by group transfer polymerization and solution characterization

Simmons, M. R.; Patrickios, Costas S. (1999)

Oligomers covering degrees of polymerization up to 23 of 2-(1-imidazolyl)-ethyl methacrylate (ImEMA) were synthesized by group transfer polymerization (GTP) in propylene carbonate and tetrahydrofuran (THF). While GTP ...

Article

Optically thin palladium films on silicon-based substrates and nanostructure formation: effects of hydrogen

Othonos, Andreas S.; Kalli, Kyriacos; Tsai, D. P. (2000)

Optically thin palladium films evaporated on different silicon-based substrates are investigated following exposure to different concentrations of hydrogen gas in air. Laser modulated reflectance off the palladium surface ...

Article

Precipitation of a water-soluble ABC triblock methacrylic polyampholyte: effects of time, pH, polymer concentration, salt type and concentration, and presence of a protein

Patrickios, Costas S.; Sharma, L. R.; Armes, S. P.; Billingham, N. C. (1999)

The solution behavior of a low molecular weight ABC triblock methacrylic polyampholyte with the structure (dimethylaminoethyl methacrylate)8-(methyl methacrylate)12-(methacrylic acid)16 was investigated by turbidimetry. ...

Article

Structural and Redox Properties of Ce1-xZrxO2-δ and Ce0.8Zr0.15RE0.05O2-δ (RE: La, Nd, Pr, Y) Solids Studied by High Temperature in Situ Raman Spectroscopy

Andriopoulou, Chrysanthi; Trimpalis, Antonios; Petallidou, Klito C.; Sgoura, Anna; Efstathiou, Angelos M.; Boghosian, Soghomon (2017)

In situ Raman spectroscopy at temperatures up to 450 °C is used to probe the structural and redox properties of Ce1-xZrxO2-δ solids (x = 0-0.8) prepared by the citrate sol-gel and coprecipitation with urea methods. The ...

Article

Structure, mechanical and tribological properties of nitrogen-containing chromium coatings prepared by reactive magnetron sputtering

Rebholz, Claus; Ziegele, H.; Leyland, A.; Matthews, A. (1999)

Cr(1-x)N(x) coatings were deposited by magnetron sputtering at a substrate temperature of 200°C onto AISI 316 stainless-steel substrates immersed in an Ar/N2 plasma. The goal of this investigation was to study the influence ...

Article

Structure, mechanical and tribological properties of sputtered TiAlBN thin films

Rebholz, Claus; Schneider, J. M.; Voevodin, A. A.; Steinebrunner, J.; Charitidis, C.; Logothetidis, S.; Leyland, A.; Matthews, A. (1999)

TiAlBN films were produced by simultaneously sputtering from TiAl and TiB2 targets in Ar/N2 mixtures at a substrate temperature of 150 °C. The goal of this investigation was to study the influence of the nitrogen content ...

Article

Synthesis and aqueous solution characterization of catalytically active block copolymers containing imidazole

Simmons, M. R.; Patrickios, Costas S. (1998)

Conference Object

Synthetic polyampholytes for protein partitioning in two-phase aqueous polymer systems

Patrickios, Costas S.; Abbott, Nicholas L.; Foss, Robert P.; Hatton, T. Alan (Publ by AIChE, 1992)

The equilibrium phase behavior of aqueous systems composed of poly(vinyl alcohol), a synthetic acrylic random polyampholyte (acrylic acid:dimethylaminoethyl methacrylate:methyl methacrylate = 0.9:1:1) and added salts was ...

Article

Transient isotopic kinetic study of the NO/H2/O2 (lean de-NOx) reaction on Pt/SiO2 and Pt/La-Ce-Mn-O catalysts

Costa, Costas N.; Efstathiou, Angelos M. (2004)

Steady-state isotopic transient kinetic analysis (SSITKA) coupled with temperature-programmed surface reaction (TPSR) methods and using in situ mass spectroscopy and DRIFTS have been applied for the first time to study ...

Article

Wear behaviour of carbon-containing tungsten coatings prepared by reactive magnetron sputtering

Rebholz, Claus; Schneider, J. M.; Leyland, A.; Matthews, A. (1999)

W(1-x)C(x) coatings (with x being in the range of 0.05-0.19) were deposited by reactive magnetron sputtering on to AISI 316 stainless-steel substrates in order to study the influence of the carbon content on the tribological ...

Article

X-Ray diffraction investigations of magnetron sputtered TiCN coatings

Schneider, J. M.; Voevodin, A.; Rebholz, Claus; Matthews, A.; Hogg, J. H. C.; Lewis, D. B.; Ives, M. (1995)

X-ray diffraction measurements were performed on titanium carbonitride coatings produced in an electron enhanced, unbalanced magnetron system. The films were deposited onto AISI 316 stainless steel substrates with an argon ...