Materials Literature
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It is established that some superplastic materials undergo significant cavitation during deformation. Cavitation not only limits the superplastic ductility of the material, but also reduces the service properties and the fatigue performance of the formed parts. Experimental results have shown that an effective method…
Pluronic F127 has received increasing attention over many years as drug delivery systems, biomaterials, and hydrogels for tissue engineering. In this study, we synthesized temperature-sensitive and cell-adhesive triblock F127 copolymers, in which Arg-Gly-Asp (RGD) peptide ligand was grafted to Pluronic F127-4-methacry…
Three-component ferroelectric superlattices consisting of alternating layers of SrTiO3, BaTiO3, and CaTiO3 (SBC) with variable interlayer thickness were fabricated on Pt(111)/TiO2/SiO2/Si (100) substrates by pulsed laser deposition. The presence of satellite reflections in x-ray-diffraction analysis and a periodic con…
We have studied the magnetic and electronic properties of (Ga,Mn)As ferromagnetic semiconductor layers containing low concentrations of room temperature magnetic MnAs precipitates, using x-ray magnetic circular dichroism in x-ray absorption spectroscopy. Measurements below and above the Curie temperature of the (Ga,Mn…
North Carolina State University Theses Textile and Apparel Management.
Superplastic forming (SPF) of magnesium alloys has received increasing attention in the recent past. The aim of this presentation is to review recent works dealing with SPF of Mg alloys with a three-fold objective: i. How to produce fine or ultra fine grained (UFG) microstructures ii. Are there specifities in superpla…
The effects of interfacial states on the temperature dependence of the magnetoresistance (MR) of Sr2FeMoO6-glass composites have been studied. X-ray diffraction analyses show that the glass is most likely located at the grain boundary without causing a change of the crystal structure of Sr2FeMoO6. The variation of the…
Effectiveness of epidermal growth factor receptor(EGFR)-targeted, long circulating and temperature-sensitive liposomes(TSLs) is described using sterically stabilized gemcitabine-loaded liposomes in vitro. Development of long-circulating formulation of TSLs with the EGFR antibody attached was designed to expect an incr…
We exploit the upconversion process, utilizing it as a sensitive tool in site-selective spectroscopy of rare earth ion-doped solids. In the Y3Al5O12:Pr3+ praseodymium-doped yttrium aluminum garnet (YAG:Pr) crystals the Pr ions are situated in sites having slightly different environments. Under pulsed excitation into t…
The authors tried to enhance the thermoelectric figure of merit of AgTlTe with extremely low thermal conductivity by controlling the carrier concentration. Pd- or Cu-doped AgTlTe was prepared and characterized. Pd did not dissolve in AgTlTe, whereas Cu fully dissolved up to x=0.4 in Ag1−xCuxTlTe. The effect of Cu dopi…
Nonwoven nanofiber matrices were prepared by electrospinning a solution of silk fibroin (SF) dissolved either in formic acid or in 1,1,1,3,3,3-hexafluoro-2-isopropyl alcohol (HFIP). The mean diameter of the electrospun nanofibers prepared from SF dissolved in formic acid was 80 nm with a unimodal size distribution, wh…
Detailed studies of room temperature crystal structures, phase transitions, and related magnetic entropy changes (ΔSm) in shape memory alloys Ni2Mn0.75Cu0.25−xCoxGa (x=0.0, 0.01, 0.02,0.025 0.03, 0.05) have been carried out by x-ray diffraction, magnetization, and thermal expansion measurements in magnetic fields of u…
Magnesium and its alloys are possible to develop new type of biodegradable medical magnesium alloys by using their active corrosion potential. The bio-corrosion properties of the high pure magnesium in the Hank’s solution were investigated in this paper, the results showed that high pure magnesium had a low corrosion…
The formability of AZ31 magnesium alloy sheets has been investigated in the temperature range varying from 200 to 300°C. Forming limit diagrams have been obtained by performing Nakazima-based tests. The different straining conditions have been investigated using sheet blanks with several length to width ratios. The fo…
The impetus of this work was to investigate the electromagnetic and tensile properties of several commercially available plastoferrites (PFs) at ambient conditions. The approach involved selection of a set of PFs and measuring their complex effective permittivity ε=ε′−jε″ and permeability μ=μ′−jμ″ under uniaxial stres…
Absorption and fluorescence spectra of commercially available polycrystalline ceramic Nd3+:Y2O3 and nanocrystalline aggregates of Nd3+:Y2O3 grown in our laboratory are optically characterized at nominal 8K and room temperature. In comparing the spectra obtained from these two different sources, we find similarities in…
The enhancement of photoluminescence (PL) is demonstrated from silicon nanocrystals (Si-ncs) by strong coupling of excitons to surface plasmon polaritons (SPPs) supported by a Au thin film. SPPs excited via excitons in Si-ncs were Bragg scattered to photons by one- or two-dimensional gratings, and strong and direction…
We investigate the effect of postgrowth annealing on the magnetic domain structure and magnetization reversal process of (Ga,Mn)As epilayers grown with tensile strain on a (Ga,In)As buffer. In the case of perpendicular magnetic easy axis, annealing drastically changes the domain structure observed at magnetization rev…
The surface roughness of dc magnetron sputtered Al films has been characterized as a function of (a) substrate deposition temperature from 54 to 223 °C, (b) argon sputtering pressure from 1.0 to 9.0 mTorr, and (c) dc magnetron power from 140 to 3590 W corresponding to (d) deposition rates ranging from 0.28 to 7.7 nm/s…
The availability to produce Ti-6Al-4V sheet material with submicron-grained microstructure for superplastic forming (SPF) has been studied. The laboratory scale sheets with an average grain size of 0.3 μm and the commercial size sheets with an average grain size of 0.65 μm were produced by pack rolling manufacturing t…