Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract Halogenated plastics such as PVC pipe, PTFE tube, and latex gloves were test‐burned in a bench‐scale molten salt oxidation reactor. Hydrogen halides (HCl and HF) and free halogens (Cl 2 and F 2 ) first released by the thermal decomposition of halogenated plastics (PVC and PTFE) were nearly completely collecte…
Silk is a good example of a self-assembled natural material with attractive characteristics. Attempts are now being made to produce recombinant forms, through transgenic animals, that have potential in a number of medical technologies.
Crack‐velocity ( v – K ) curves and crack‐resistance ( R ) curves for unpoled ferroelectric and ferroelastic lead zirconate titanate (PZT) were determined for long cracks in compact‐tension (CT) geometry using an in situ fracture device on the stage of an optical microscope. The steady‐state crack length and the plate…
The corrosion rate of zinc under thin electrolyte layers and during exposure to wet/dry cyclic conditions has been investigated in sodium chloride (NaCl) and ammonium sulfate ([NH4]2SO4) solutions using electrochemical impedance spectroscopy (EIS) and potential measurements. The integral corrosion rate was found to de…
Efficient photoluminescence (PL) up-conversion in CdSe/ZnS quantum dots prepared by an organometallic approach is reported. It is demonstrated that the efficiency of photon energy up-conversion and the magnitude of the spectral shift can be controlled by (i) the thickness of the ZnS layers, (ii) the temperature depend…
The fracture toughness of a sintered reaction‐bonded silicon nitride was measured by the single‐edge precracked beam and surface crack in flexure methods, which are two of the three complementary test methods in ASTM C 1421. Results were compared with chevron‐notched beam results that were available from another sourc…
Abstract Three types of copolymers of poly( L ‐lactic acid) (PLLA) were synthesized by direct polycondensation of L ‐lactic acid and phenyl‐substituted α ‐hydroxy acids ( L ‐phenyllactic acid and D ‐ and L ‐mandelic acids). It was found that the glass transition temperature of the copolymers comprising L ‐mandelic aci…
The effect of a water jet pressure profile (WJPP) and initial web geometry on the properties of hydroentangled fabrics is investigated. Different web structures (obtained by parallel, cross, and air-laid formation) are produced and hydroentangled at the same total pressure but with different water jet profiles. Compos…
A difference in fracture strength was noted among commercial alumina ceramics. The origin of this difference was examined using optical microscopy in the transmission mode. Large defects measuring several tens of micrometers or more were clearly observed, and a direct correlation was found between the size of the larg…
Abstract This paper compares the modification mechanism provided by ethylene‐octene (EO) copolymer to that of ethylene‐propylene‐diene terpolymer (EPDM) rubber. Within the limits of this study, the highest impact strength was achieved at 30–40% rubber content, regardless of the rubber type. An increase in rubber melt…
Abstract Two novel ferrocenyl complexes [Ag(L) 2 ](NO 3 )·(MeOH)· (EtOH) ( 1 ) and [HgI 2 (L)] ( 2 ) {L = 1,2‐bis[(ferrocen‐l‐ylmethylene)amino]ethane} have been prepared and structurally characterized by means of X‐ray single crystal diffraction. The central ion, silver( I ) or mercury( II ), has a distorted tetrahed…
The size effect of magnetically ordered nanoparticles on the Curie temperature is discussed. For a system of Fe 3 O 4 nanoparticles with different dispersities, it is demonstrated that the smaller the size of the particles, the larger the thickness of their surface layer, which is characterized by considerable distort…
Abstract The catalyst particle fragmentation process is an important step in determining the final morphology of olefin polymer particles. Understanding the different phenomena that influence it is, therefore, essential in optimizing polymerization processes and in obtaining the desired quality of polymer. A new visco…
Equipment-generated damping in the resonant column (RC) test due to interaction between the magnets and solenoids in the drive system causes a bias error in measured values of material damping ratio. Calibration and post-measurement corrections have been used to address this problem. In this study, an electromechanica…
Traditional approaches to generating tissue-engineered arteries in vitro rely on expansion of cells in culture to seed appropriate scaffolds. In most envisioned applications, small autologous blood vessels would be harvested and used as a source for these cells. We propose that small autologous arteries, not the cells…
A Mg,Al layered double hydroxide (LDH) with [Cr(C(2)O(4))(3)](3)(-) anions in the interlayer has been synthesized following two different routes: reconstruction from a mildly calcined Mg,Al-carbonate LDH, and anion exchange from a Mg,Al-nitrate LDH. The solids prepared have been characterized by elemental chemical ana…
A wide range of applications for superparamagnetic iron oxide (SPIO) particles as contrast media for MRI has emerged over the last 15 years. SPIO particles can be manufactured with different particle sizes and surface coatings. Large SPIO particles (50-150 nm) predominantly produce a signal decrease or T2 -shortening…
Computer modeling techniques have been used to study the structure and energetics of H defects in Mg 2 SiO 4 forsterite and their infrared stretching frequencies. The calculated defect binding energies indicate that OH groups will combine with cation vacancies to form neutral defect complexes. Such defect clusters are…
A novel hybrid compressive mica seal was developed that showed an exceptionally low leak rate of ∼8.9 × 10 −4 sccm/cm (standard cubic centimeters per minute per unit leak length of seal) at 800°C and a compressive stress of 100 psi, about 740 times lower than that of the conventional compressive mica seals (6.6 × 10 −…
Lewin, J. C. (1965) showed that boron is required for the growth of Cylindrotheca fusiformis , and, presumably, other diatoms too. It may be involved in cellular metabolism, as in higher plants, or incorporated by accident or design into the siliceous skeletons (frustules), since B 2 O 3 has been proven to replace SiO…