Materials Literature
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The heat transfer coefficients during natural convection of water on a downward-facing horizontal surface and that on a vertical surface were measured under the influence of ultrasonic vibrations. The multi-type oscillation used in this experiment was able to operate at three frequencies—28, 45, and 100 kHz—not only c…
A new photochromic cross-linked copolymer composed of PMMA and fluorescing 2-indolylfulgimide is synthesized which can be converted photochemically into two forms which are found to be thermally stable; the spectroscopic properties and quantum yields of photochemistry and fluorescence are also measured.
The cryptand derivative has H-bond mediated trigonal network structure that leads to octupolar bulk nonlinearity
Tetraethylorthosilicate (TEOS), hexamethyldisilazane (HMDS) and n-hexane, plasma deposited on alumina pellets, result in hydrophobic and chemically resistant films, while TEOS treated alumina powder showed significant changes in the zeta potential as a function of pH.
Several strains of thermophilic bacteria containing maleate cis-trans isomerase were isolated from soil samples and identified as Bacillus stearothermophilus, Bacillus circulans, Bacillus brevis, and Deleya halophila. The maleate cis-trans isomerase was purified and characterized from one of the isolated strains, B. s…
The effects of lamination temperature on the properties of poly(ethylene terephthalate-coisophthalate) (co-PET), such as thermal, mechanical, and barrier properties, have been investigated in co-PET laminated steel. The variation of the degree of crystallinity and the orientation of the co-PET film during the laminati…
Degradable polymers including Eastar Bio Copolyester 14766 (EBC), Mater-Bi ZF03U (MBI) andpolylactic acid (PLA) blended in various ratios (10, 25, and 40%) with regular (25% amylose) and waxy corn starcheswere extruded into loose-fill packaging foams using a co-rotating twin screw extruder. No significant differences…
Surface-enhanced Raman scattering from 2,2′-bipyridine adsorbed on nickel is detected without roughening procedure of the surfaces. The SERS-activation is assured by depositing silver colloidal layer onto the metal with adhering ligand. The SERS spectrum closely corresponds to the Raman spectrum of the Ni(II) coordina…
To characterize easily the state of real metal surfaces in ambient environments, we have developed an extremely sensitive technique for surface analysis using photoelectron emission phenomena as a function of temperature. We will call this method temperature-programmed photoelectron emission (TPPE). The emitted electr…
This work has investigated the electrical and material characteristics of post‐chemical mechanical planarization (CMP) methylsilsesquioxane (MSQ). Experimental results have shown that the dielectric properties of low k MSQ deteriorate after the CMP process. However, by applying post‐treatment, the degraded characteris…
The 1-naphthylmethylammonium salts of not only (Z,Z)- but also (E,E)-muconic acid were found to polymerize upon photoirradiation in the crystalline state to provide a stereoregular polymer in a high yield. The stereochemical structure of both polymers obtained from the monomers with different configurations was identi…
Extracted from text ... A comparison of leather properties of skins from ten different South African sheepbreedsM.A. Snyman 1 and C.A. Jackson-Moss 21 Grootfontein ADI, P/Bag X529, Middelburg, (EC), 59002 International School of Tanning Technology, P.O. Box 2085, Grahamstown, 6140e-mail:Dier6@karoo1.agric.zaIntroducti…
Various protonated poly(o-anisidine) (PoAN)/poly(vinyl alcohol) (PVA) composites were prepared with different types of acids: sulfuric (SA), p-toluene sulfonic (TSA), camphor sulfonic (CSA), and p-dodecylbenzene sulfonic (DBSA). In the visible spectrum of each composite in dimethyl sulfoxide, three absorption peaks we…
The solution properties of poly(dimethyl siloxane) (PDMS) were studied with light scattering (LS), gel permeation chromatography/light scattering (GPC/LS), and viscometry methods. PDMS samples were fractionated, and the weight-average molecular weights, second virial coefficient, and the z-average radius of gyration o…
A hot isostatically pressed (HIP) assembly of titanium alloy encapsulated AD995 ceramic, subjected to ballistic impact, is studied in detail. The crack behavior of ceramic confined in this way is studied in a combined experimental and computational effort. Fabrication of the HIP assembly is described. An experiment in…
Ceramic materials are commonly used as ballistic protection materials. The response of a ceramic to impact, perforation and penetration is complex and only limited physical instrumentation can be used in experiments. This paper demonstrates how a hydrocode, such as AUTODYN, can be used to aid in the understanding of t…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation M. J. Sablik, Y. Chen, D. C. Jiles; Modified law of approach for the magnetomechanical model. AIP…
The behavior of mutually coupled cavitation bubbles can change considerably when a finite speed of sound propagation in the liquid is taken into account. This holds for the radial oscillations of the bubbles as well as for the interaction (Bjerknes) forces between them. Starting from linear analysis of the equations o…
A novel preparation route for ATZ (alumina toughened zirconia) ceramics is presented, using a commercial ATZ powder (a mixture of 20 wt.% alumina and 80 wt.% zirconia containing 3 mol.% yttria) as a solid filler and an ATZ sol or gel (of the same composition) as a liquid binder for paste extrusion at room temperature.…
A macrosegregation defect, commonly termed freckle, has limited the maximum diameter of remelted ingots of some Nbstrengthened nickel base superalloys. Two aspects of freckle formation were studied in three commercially important superalloys 718, 706 and 625: 1) the segregation characteristics which provide the drivin…