Materials Literature
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Abstract Blends of isotactic polypropylene and polyamide‐6/clay nanocomposites (iPP/NPA6) were prepared with an internal batch mixer. A high content of the β‐crystalline form of isotactic polypropylene (β‐iPP) was observed in the injection‐molded samples of the iPP/NPA6 blends, whereas the content of β‐iPP in the iPP/…
The quasi-one-dimensional organic conductor (Per)2Pt(mnt)2 exhibits a charge density wave ground state below 8 K. Magnetoresistance and magnetization measurements show that the charge density wave is suppressed with magnetic fields of order 20 T, above which a high resistance state, with a cascade of subphases, appear…
The diffraction from one- and two-dimensional aperiodic structures is studied by using Fibonacci and other aperiodic gratings produced by several methods. By examining the laser diffraction patterns obtained from these gratings, the effects of aperiodic order on the diffraction pattern was observed and compared to the…
Stress migration (SM) or stress-induced voiding (SIV) experiments were conducted for two BEoL (Back End of Line) technologies: Cu/FTEOS and Cu/Low-k. Experiments have shown the mean time to failure (MTF) depends on ILD (interlayer dielectric) materials properties, ILD stack and metal line width. Stress migration is wo…
Abstract The effect of α‐cyclodextrin (α‐CD) on the crystallization behavior of poly(3‐hydroxybutyrate) (PHB) was investigated with polarized optical microscopy, differential scanning calorimetry, and wide‐angle X‐ray diffraction. We found that the addition of α‐CD can greatly accelerate the crystallization of PHB and…
Analyses of individual biomolecules, like DNA, or DNA-protein complexes, via atomic force microscopy, require 'gentle' methods to immobilize DNA on surfaces, which allow the ensemble of molecules to adopt conformations dictated primarily by their physical characteristics, and which possibly permit the use of a wide se…
Abstract Crystals experience changes in both size and shape during growth. A method is developed for the simultaneous prediction of crystal shape evolution and size distribution for solution crystallization processes by combining shape evolution modeling and population balance modeling techniques. When surface integra…
We present a detailed room-temperature x-ray powder diffraction study on ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Ni}{\mathrm{O}}_{4+\ensuremath{\delta}}$ with $0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.12$ and $0\ensuremath{\leqslant}\ensuremath{\delta}\ensuremath{\leqslant}0.13$. For $x=0.02$,…
The isothermal crystallization kinetics of maleic anhydride grafted polypropylene (mPP) in hybrids with unmodified or organically modified montmorillonite (MMT), which have been prepared by melt intercalation in a mixer, has been investigated by using time-resolved wide-angle X-ray scattering (WAXS) and differential s…
Electromigration in Cu Damascene lines capped with either a CoWP, Ta/TaN, SiN/sub x/, or SiC/sub x/N/sub y/H/sub z/ layer was reviewed. A thin CoWP or Ta/TaN cap on top of the Cu line surface significantly reduced interface diffusion and improved the electromigration lifetime when compared with lines capped with SiN/s…
A nonaqueous molecular precursor grafting approach was employed for the generation of well-defined surface structures featuring Cu on a mesoporous silica support. X-ray absorption measurements (XANES and EXAFS) were used to determine that [CuOSi(OtBu)3]4 provided 100% isolated Cu(I) sites upon grafting (without therma…
Neutralized and nonneutralized chitosan films subject to different thermal treatments were studied by dielectric relaxation spectroscopy from -130 to +150 degrees C in the frequency range between 20 Hz and 1 MHz. Two main relaxation processes, both arrhenian type, were detected: process I at temperatures below 0 degre…
Copolyesters were synthesized by using ring-opening polymerization of cyclic poly(butylene terephthalate) oligomers (c-PBT) and ε-caprolactone monomer (CL) in the presence of stannoxane catalyst at an elevated temperature. The in-situ copolymerization was conducted with various c-PBT/CL feed ratios. The copolyesters w…
Based on Monte Carlo simulations, the stable magnetization configurations of an antiferromagnet on a quasiperiodic tiling are derived theoretically. The exchange coupling is assumed to decrease exponentially with the distance between magnetic moments. It is demonstrated that the superposition of geometric frustration…
This paper reports the facile synthetic strategy of a series of novel pi-conjugated dendrimers (G0 and G1) based on 10,15-dihydro-5H-diindeno[1,2-a;1',2'-c]fluorene (truxene) in which the benzene cores are generated "in-situ" from acetyl aromatics by the acid-promoted cyclotrimerizations. The unique NMR behaviors, phy…
Dendrimers based on melamine can reduce the organ toxicity of solubilized cancer drugs administered by intraperitoneal injection. Methotrexate and 6-mercaptopurine, both FDA approved anticancer drugs, are known hepatotoxins. The solubility of these molecules can be increased by mixing them with a dendrimer based on me…
New low-gap thiophene-based regular copolymers are produced by anodic coupling of 3,4-ethylenedioxythiophene-2,5-substituted thieno[3,4- b ]pyrazine (TP), cyclopenta[2,1- b;3,4- b ‘]dithiophen-4-one (CO), and 4-dicyanomethylene-4 H -cyclopenta[2,1- b;3,4- b ‘]dithiophene (CN). The copolymers are characterized by cycli…
Nanoimprint lithography and self-assembly of poly(styrene)- block -poly(methyl methacrylate) (PS- b -PMMA) diblock copolymer are combined to induce order in the phase-separated domains. Tailored periodic arrays of poly(methyl methacrylate) (PMMA) cylinders normal or parallel to neutralized silicon surfaces can be form…
Kinetic Monte Carlo simulation in conjunction with molecular dynamics simulation is utilized to study the effect of the steered deposition on the growth of Cu on Cu(1,1,17). It is found that the deposition flux becomes inhomogeneous in step train direction and the inhomogeneity depends on the deposition angle, when th…
The effect of the variation of oxygen content on structural, magnetic and transport properties in the electron-doped manganites La0.9Te0.1MnOy has been investigated. All samples show a rhombohedral structure with the space group . The Curie temperature decreases and the paramagnetic-ferromagnetic (PM-FM) transition be…