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。
In the present paper, a methodology has been presented for the reliability assessment of concrete barriers that lie at a certain depth in the soil, and a missile (a rigid projectile) impacts the top of the soil cover normally, and subsequently after penetrating the soil cover completely it hits the barrier with certai…
Copolymers of rac-lactide (rac-LA) and ε -caprolactone (CL) were synthesized with tin(II) 2-ethylhexanoate and 1,4-butanediol at 130°C using two methods of copolymerization: conventional copolymerization and sequential polymerization using poly(CL) as a macroinitiator for rac-LA. Conventional copolymerizations showed…
Solution-phase X-ray scattering measurements in combination with coordinate-based modeling have been used to characterize the conformational ensemble of a hexameric, diphenylethyne-linked porphyrin array in solution. Configurationally broadened X-ray scattering patterns measured at room temperature for dilute toluene…
A Gamma-ray irradiation was employed to modify high density polyethyelene (HDPE) in order to impart poor interfacial interaction between hydrophobic matrix and hydrophilic Sericite-Tridymite-Cristobalite (STC) filler. The STC filler was further treated with a silane coupling agent. The FTIR, SEM and rheological observ…
Chemical vapor deposition (CVD) of carbon nanotubes (CNTs) has been investigated using a coupled gas phase and surface chemistry model. This model successfully bridged the gap between the reactor and molecular length scales and allowed individual surface kinetic processes to be identified as growth limiting directly f…
Abstract The synthesis, aggregation, and optical properties of a chiral, regioregular polythiophene, substituted with a conjugated substituent, are described. The polymer was prepared using a Stille coupling reaction. The fact that the side‐chain contributes to the absorption (UV‐vis), emission (fluorescence), and red…
The rupture of soap films has attracted scientific interest for over a century, but only few qualitative and quantitative experiments of bursting soap bubbles have been reported so far. Thermotropic smectic films behave, in many respects, in a very similar manner to lyotropic (soap) films. We compare the rupture dynam…
The root of Fallopia multiflora is one of the most widely used traditional Chinese medicines. However, it is often confused and substituted with the roots of F. multiflora var. ciliinervis, Pteroxygonum giraldii, Cynanchum auriculatum, and Stephania cepharantha. To establish a DNA polymorphism-based assay for the iden…
The ring-opening polymerization of salicylic acid O-carboxyanhydride (SOCA) was studied under various reaction conditions and analyzed by means of MALDI-TOF mass spectrometry with regard to the formation of cyclic poly(salicylide)s. First, two thermal polymerizations were performed in the melt at 170°C and cyclic olig…
Polyamide/Ca3(PO4)2 nanocomposites were prepared via melt intercalation on twin-screw extruder. Different particle sizes (21, 17, 11 nm) of Ca3(PO4)2 were synthesized by in situ deposition technique and its sizes were confirmed on X-ray difractometer. Amount of loading of nano-Ca3(PO4)2 in the polyamide was ranges in…
Two initiators containing a cleavable ester bond were compared in the lipase-catalyzed ROP of CL and PDL. The results show that transesterification reactions are present at high rates throughout the enzymatic ROP and start at low conversion. HEA and HEMA displayed similar reaction efficiencies as initiators (acyl acce…
This study compares the electrical resistivity, magnetization, and high-resolution neutron powder diffraction data obtained for Pr 0.5 Ca 0.5 CoO 3 and Pr 0.5 Ca 0.5 CoO 3-δ (δ∼0.045). Although both samples exhibit similar structural parameters, the distortion of the CoO 6 octahedra is weaker in Pr 0.5 Ca 0.5 CoO 3-δ…
Rosette nanotubes (RNTs) are a new class of nanomaterials with significant therapeutic potential. However, societal concerns related to the potential adverse health effects of engineered nanomaterials drew attention towards the investigation of their interaction with the human U937 macrophage cell line. The cells are…
Using fixed-angle ellipsometry, we investigate the degree of mass transfer upon vertically dipping a polystyrene surface through a layer of a polystyrene-poly(ethylene oxide) (PS-PEO) block copolymer at the air water interface (Langmuir-Blodgett or LB transfer). The transferred mass is proportional to the PS-PEO graft…
Abstract Nanocomposites based on poly(vinyl alcohol) and silver nanoparticles were efficiently prepared by sun‐ and thermal‐promoted reduction processes. Uniaxial drawing of the Ag/PVA nanocomposites favoured the anisotropic distribution of silver particles, providing oriented films with polarisation‐dependent tunable…
The crystal and magnetic structures of LaCa(2)Fe(3)O(8) and NdCa(2)Fe(3)O(8) have been established using a combination of x-ray, neutron and electron diffraction. It was already considered likely that LaCa(2)Fe(3)O(8) and NdCa(2)Fe(3)O(8) were made up of stacked perovskite-like layers of FeO(6) octahedra, with every t…
The dynamic features of soot combustion on a single layer, planar diesel particulate filter (DPF) were studied using IR imaging. At a feed temperature of 635 °C, the soot combustion rate was uniform all over the surface at low oxygen concentrations. At higher oxygen concentrations, local ignition occurred at either on…
North Carolina State University Theses Textile Engineering, Chemistry and Science.
Abstract CuAlO 2 polycrystalline films were deposited by the helicon‐wave‐excited plasma sputtering (HWPS) method at 700 °C. The best full‐width at half‐maximum value of the (006) CuAlO 2 X‐ray diffraction peak was 0.19 degrees, which was similar to those reported previously using other deposition methods. While, nonc…
We investigate a minimal equilibrium polymerization model for the competition between self-assembly on a boundary and in solution that arises when an assembling system is in the presence of an adsorbing interface. Adsorption generally occurs upon cooling, but assembly (equilibrium polymerization) may arise either upon…