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 The rheology, morphology and properties of the composite systems of LCP, Vectra A TM 950 and Nylon 66 were investigated. The viscocity ratio of LCP and matrix has strong influence on their morphology. For LCP blends, the viscosity ratio of LCP is a critical factor in determining the blend morphology. The opti…
The distribution of anionic groups in fibres, fines, the colloidal fraction, and the dissolved fraction of thermomechanical pulp (TMP) suspensions was determined. The influence of extraction, alkaline treatment, and peroxide bleaching of spruce TMP were also studied. Spruce TMP was extracted with hexane, treated with…
Underwater friction surfacing experiments were carried out in a waterbath to clarify the effect of the surrounding medium on the characteristics of the process and the deposit. A quench hardenable martensitic stainless steel with 1%C and 17%Cr was used as the coating material and low carbon structural steel as the sub…
β-Al 2 TiO 5 thin films were obtained by dip-coating silicon substrates in acid-catalyzed precursor sols of aluminum and titanium alkoxides with and without acetyl acetone as a chelating agent and subsequent firing at 700 °C. Nuclear magnetic resonance and mass spectra of the precursor sols demonstrated that synthesis…
The synthesis and liquid crystalline behaviour of the first and second generations of a dendrimeric structure based on poly(propyleneimine)(DAB-dendr(NH2)x) are reported. 4-(4-n-Alkoxybenzoyloxy)salicylaldehydes are used as mesogenic moieties attached at the peripheral amino groups of the dendrimers giving rise to den…
Different glasses in the system xPbF2: (1 — x)[PbO : TeO2] have been synthesized and investigated. The effects of increasing PbF2 contents on material properties such as glass transition temperature (Tg), thermal expansion coefficient (α), microhardness (Hv), and electrical conductivity (σ) are studied. Addition of Pb…
The surface of porous silica particles was modified with poly(acrylic acid) by reacting the carboxyl groups on poly(acrylic acid) with the amino groups of pregrafted aminopropyltriethoxysilane (APS). The chemical modifications by APS and polymer were characterized by infrared spectroscopy and the amount of APS and pol…
Heating of polystyrene beads containing pentane isomers as the blowing agent traditionally produces polystyrene foam. Undesirable emissions of the blowing agent and its high flammability are the complications of this process. A new process for the production of expandable polystyrene has been developed, using water as…
Foams have been used for several decades to decrease the mobility of drive gas or steam, thereby enhancing the reservoir sweep efficiency. More recently foams found application in near-wellbore production enhancement operations such as acid diversion for matrix stimulation, gas shut-off, water shut-off and hydraulic f…
The thermo-insulating properties of both perpendicular- and conventional cross-laid lofty nonwoven fabrics, four different types each in terms of fiber fineness, are investi gated using a new static method with a heat flux sensor. The relationship between the thermal conductivity and the material density of all the sa…
Nucleation and growth of stable and metastable crystalline phases are described in the framework of a single-order parameter Cahn–Hilliard theory. A piecewise parabolic free-energy order parameter relationship composed of three parabolas of positive curvature coefficient has been adopted. The analytical solution of th…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis of a NdAlO3/Al2O3 Ceramic−Ceramic Composite by Single-Source Precursor CVD†Michael Veith, Sanjay Mathur, Nicolas Lecerf, Karsten Bartz, Manuela Heintz, and Volker HuchView Author Information Institute of Inorganic Chemistry, University of Saarland, D-66123 Sa…
The magnetoresistance (MR) of icosahedral Al-Pd-Re of nominal composition ${\mathrm{Al}}_{70.5}{\mathrm{Pd}}_{21}{\mathrm{Re}}_{8.5},$ and with resistance ratios R [=\ensuremath{\rho}(4 K)/\ensuremath{\rho}(295 K)] from 2 to 120, has been measured in the range 0.1--40 K in magnetic fields up to 12 T. Three regions of…
Electron-spin-resonance (ESR) and dielectric spectroscopy techniques have been applied to study the dipole centers connected with ${\mathrm{Mn}}^{2+}$ and ${\mathrm{Fe}}^{3+}$ impurity ions substituted for ${\mathrm{K}}^{+}$ in the incipient ferroelectric ${\mathrm{KTaO}}_{3}.$ It was shown that the reorientations of…
Self-consistent approaches for quantification of the phase composition of ordered mesoporous materials (OMMs) are proposed on the basis of powder X-ray diffraction (XRD), and, for the first time, on the basis of gas adsorption and thermogravimetry (TGA). A series of hexagonal MCM-41 samples containing different amount…
A method of powder diffraction analysis is proposed that is applicable to transition metal nanoparticles and which has been applied to palladium. From results of simulations it is shown that: ( a ) the overall average lattice constant of small transition metal clusters decreases with decreasing size of the cluster as…
The present study investigated the in vitro mechanism and degradation rate of polyhydroxyoctanoate (PHO). Solution-cast PHO films were incubated in either water or isoosmotic phosphate-buffered saline (PBS) for periods ranging from 1 to 24 months. Physical characterization included weight loss, water absorption, pH ch…
The crystal structure of α-silicon nitride (Si 3 N 4 ) was refined by the Rietveld method using synchrotron radiation powder diffraction data (wavelength = 1.2 Å) collected at station BL-4B2 in the Photon Factory. A refinement procedure that adopted a new weight function, w = 1/Y_o^e ( Y o is the observed profile inte…
A variety of physico-chemical methods employ chemical denaturants to unfold proteins, and study different biophysical processes involved therein. Chemical denaturants are believed to induce unfolding by stabilizing the unfolded state of proteins over the folded state, either macroscopically or through specific interac…
The effect of the ac electric field on piezoelectric properties is investigated in lead zirconate-titanate (PZT) films of various compositions and thicknesses. Non-linear piezoelectric properties of PZT films are compared to those of bulk ceramics. It is shown that non-linearity is strongly suppressed in thin films of…