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。
The linear low density polyethylene (LLDPE) nano‐SiO2 composites were prepared by melt blending and the mechanical and optical properties of the composites were investigated. The results show that the elastic modulus of the composites significantly increases with the increase of SiO2 content while the breaking elongat…
Thin films of (00l) oriented SrBi2Nb2O9 epitaxially grown on SrTiO3 by sol-gel spin coating have been studied by means of high-resolution x-ray diffraction reciprocal space mapping. It is shown that these materials contain highly localized heterogeneous strain fields due to imperfect stacking faults (i.e., faults that…
The electromechanical response of pure lead zirconate titanate (PZT) and Mn-doped PZT thin ferroelectric films under nanoindentation forces of up to 500 mN was investigated. The stress-induced current transients were measured as a function of the externally applied load on films of different thicknesses using a spheri…
A modified version of a model for fiber spinning was developed for poly(lactic acid) (PLA) based on earlier models that predicted the spinline behavior of poly(ethylene terephthalate) (PET) and Nylon 6.6. Comparisons were made to melt‐spinning data of Takasaki and coworkers for high lactic acid (L)‐content PLA (PLLA)…
The crystal structures of 4-chlorophenoxyacetic acid (4CPA) included in beta-cyclodextrin (beta-CD) and heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin (TMbetaCD) have been studied by X-ray diffraction. The 4CPA/beta-CD complex crystallizes as a head-to-head dimer in the space group C2 in the Tetrad packing mode. The p…
A small amount of styrene‐maleic anhydride (SMA) copolymer was blended with polyamide‐6 (PA‐6). Polarized‐light microscope (PLM) observation and small angle light scattering (SALS) tests showed that the spherulite size of PA‐6/SMA was smaller than that of PA‐6. Differential scanning calorimetry (DSC) study showed that…
The low-temperature structure of hexamethylbenzene has been determined from neutron powder diffraction data and found to differ from the room-temperature phase predominantly by a translation of molecular planes to a form a cubic close-packed type structure. By performing measurements as a function of temperature, the…
Abstract A typical problem when analyzing the kinetics by dynamic TGA of polymer degradation consists in that different models can fit equally well, or the model does not fit the TGA data. It has been suggested that this is due to the presence of overlapping processes. High resolution TGA helps to clarify the problem…
The use of hydrogen peroxide (H2O2) to enhance the oxidation of nitric oxide (NO) under postflame conditions in the presence or absence of sulfur dioxide (SO2) has been studied by means of chemical kinetic modeling and compared with pilot-scale experimental data. The experimental results were obtained from a nonisothe…
A general theory for the detection of the core-level electronic excitation in anisotropic systems using angular integrated electron energy-loss spectroscopy (EELS) has been presented. Magic angle conditions, at which spectra are independent of specimen orientation, are proved to be valid for all anisotropic systems. D…
We demonstrated the formation of single-crystal-like materials that contain preferentially oriented arrays of lead zirconate titanate (PZT) cube-shaped particles by self-assembly. Hydrothermally synthesized PZT particles with a bulk composition of Zr/Ti = 70/30 were used in making microcrystal arrays. Spreading a susp…
Ultrasonication is a necessary process to make single-walled carbon nanotubes (SWNTs) soluble in aqueous solution with surfactants such as sodium dodecyl sulfate (SDS). However, an understanding of the sonication effects on the electronic and optical properties of SWNTs in aqueous solution is still lacking. Here, we h…
Abstract Dihydroxyl capped biodegradable poly(DTC‐ b ‐PEG‐ b ‐DTC) (BCB) triblock copolymer and poly(TMC‐ b ‐DTC‐ b ‐PEG‐ b ‐DTC‐ b ‐TMC) (ABCBA) pentablock copolymer have been synthesized by PEG and BCB copolymer as macroinitiator in the presence of yttrium tris(2,6‐di‐ tert ‐butyl‐4‐methylphenolate). The copolymers…
We calculate the intershell resistance ${R}_{21}$ in a multiwall carbon nanotube as a function of temperature $T$ and Fermi level ${\ensuremath{\epsilon}}_{\mathrm{F}}$ (e.g., a gate voltage), varying the chirality of the inner and outer tubes. This is done in a so-called Coulomb drag setup, where a current ${I}_{1}$…
To avoid potential ambiguity in the structural determination of native spider silk, we prepared both a nonlabeled peptide with a sequence containing both the polyalanine and the repeated GGA regions, QGAG(A) 6 GGAGA(GGA) 3 GAGRGGLGG ( I ), and the 13 C-labeled peptides QGAGAAA[1- 13 C]A 8 AAGG[2- 13 C]A 13 GAGGAG[2- 1…
The synthesis of novel amphiphilic graft copolyesters based on hydrophobic poly(ε-caprolactone) (PCL) segments grafted all along a hydrophilic poly(( R, S )-β-malic acid) (PMLA) backbone is proposed. These PMLA- g -PCL graft copolymers have been prepared in a controlled way using either the “grafting through” or the “…
Minute variations in a carrier density can drive drastic qualitative changes in the ground state of a correlated electron system. To establish methods of critical control of the carrier density at the boundary of phase competitions is a pressing challenge in an interdisciplinary field of modern condensed-matter physic…
The crystal structure of Cr(2)N precipitates in high-nitrogen austenitic stainless steel was investigated by transmission electron microscopy (TEM). Based on the analyses of selected area diffraction (SAD) patterns, the crystal structure of Cr(2)N was confirmed to be trigonal (P31m) and was characterized by three sets…
The stable anhydrous form of alpha-lactose has been obtained by the dehydration of alpha-lactose monohydrate in methanol. An X-ray powder diffraction pattern was recorded at room temperature with a laboratory diffractometer equipped with an INEL curved sensitive detector CPS120. The starting structural model of this f…
We present a model for reverse domain nucleation in ferroelectrics, which takes into account ferroelectric-electrode coupling in both homogeneous and random cases. The model provides a solution to the coercivity paradox--i.e., the large discrepancy between the observed and predicted coercive fields, common to many sys…