Materials Literature
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A new empirical model to estimate the content of sp 3 in diamond-like carbon (DLC) films is presented, based on the conventional Raman spectra excited by 488 nm or 514 nm visible light for different carbons. It is found that bandwidth of the G peak is related to the sp 3 fraction. A wider bandwidth of the G peak shows…
Laser-ablated sodium atom reactions with H2 have been investigated in solid molecular hydrogens and neon. The NaH molecule and (NaH)2,3,4 clusters were identified by IR spectra with isotopic substitution (HD and D2) and comparison to frequencies calculated by density functional theory and the MP2 method. The use of pa…
Abstract Generation of dislocations during the growth of oxygen precipitates has been used as an alternative way of introduction of dislocation‐related luminescence centers. For this purpose a multistep annealing of Cz Si samples with different initial concentrations of oxygen has been carried out. The analysis of def…
Magnetic diffusion time in nonlinear steel is shown to vary with applied field magnitude and whether the field is undergoing infusion (inward flow upon turnon) or effusion (outward flow upon turnoff). Transient finite-element analysis is used to compute planar flux effusion that agrees very closely with an analytical…
We investigate the configurations, electronic structures, and magnetic ordering of Mn N ( N = 2–13) clusters based on all-electron density functional theory. The Jahn–Teller effect plays an important role in determining the ground state of certain geometries. The magnetic ordering of the Mn N clusters transits from fe…
Poly(carbonate urethane)s (PCUs) are usually considered as biostable elastomers for long-term implantation. However, their hydrolytic stability is still questionable. The biodegradation appears to be initiated by oxidative and hydrolytic substances released by inflammatory cells. Therefore, the biostability of polyure…
Measurements of magnetization, electrical resistivity, and synchrotron x-ray diffraction were performed on single crystals of ${\mathrm{Bi}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ $(0.35\ensuremath{\leqslant}x\ensuremath{\leqslant}0.64)$. The resistivity and magnetization curves show a kink ne…
Effects of different mineral acids (viz. H 2 SO 4, H 3 PO 4, HNO 3, HCl, HBr, and HI), acid (H 3 PO 4 ) concentration, different halide anions (viz. F -, Cl -, Br -, and I - ), and halide anion concentration in aqueous reaction medium on the H 2 O 2 formation (in H 2 -to-H 2 O 2 oxidation) and/or on the H 2 O 2 destru…
Heart valve replacement represents the most common surgical therapy for end-stage valvular heart diseases. A major drawback all contemporary heart valve replacements have in common is the lack of growth, repair, and remodeling capabilities. To overcome these limitations, the emerging field of tissue engineering is foc…
Cr-doped InAs self-organized diluted magnetic quantum dots (QDs) are grown by low-temperature molecular-beam epitaxy. Magnetic measurements reveal that the Curie temperature of all the InAs:Cr QDs layers with Cr/In flux ratio changing from 0.026 to 0.18 is beyond 400 K. High-resolution cross sectional transmission ele…
A conjugated diyne monomer (A) was prepared by linking two acetylenic triple bonds together by a biphenyl bridge and its copolycyclotrimerizations with (E)-2-( 1-ferrocenyl)vinyl-p-phenylacetylene (B) was investigated, in an effort to synthesize ferrocene-containing hyperbranched conjugated polymers. The conjugated st…
Abstract Dislocations are common defects in both natural as well as in CVD‐grown diamond. Recent advances in the growth of high quality single crystal CVD diamond have led to an increased interest in the atomistic and electronic structure of 〈100〉 dislocations. These dislocations are observed as mixed‐type 45° and pur…
We have previously discussed [J. Chem. Phys. 125, 114502 (2006)] that optical Kerr effect (OKE) and depolarized light scattering (DLS) data of molecular liquids reveal, each in their native domain, the same characteristic signatures of the glass transition dynamics; in particular, the intermediate power law of OKE is…
A view of the single-walled nanotube reactivity based on unpairing odd electrons is suggested. It is shown that in the framework of the UHF single-determinant approach, the electron unpairing critically depends on the corresponding interatomic C−C distance, and as a result of the dependence, a perfect (4,4) nanotube s…
This study focused on mimicking collagen structurally and biologically using various peptide sequences toward realizing an artificial collagen-like biomaterial. Collagen-mimetic peptides (CMPs) incorporating integrin-specific glycine-phenylalanine-hydroxyproline-glycine-glutamate-arginine (GFOGER) sequence from residu…
We present here a finite slab of triangular checkerboard of negative refractive index material that exhibits a form of extraordinary transmission. We show that such a checkerboard can be used to confine light and can act as an open resonator. Effectively even a single point of intersection between three triangular wed…
Silicate speciation in aqueous solutions containing tetraalkylammonium hydroxide as template is examined by electrospray mass spectrometry. A thorough study has been carried out to define and optimize the conditions of analysis for a highly concentrated reaction solution of inorganic species--in this case, silicate ol…
Collective electronic excitations occurring in Na layers grown on Cu(111) and in H2O/Na/Cu(111) have been investigated at room temperature by high resolution electron energy loss spectroscopy. Loss spectra taken for a coverage between 0.55 and 0.70 ML of Na are characterized by a feature at 3.0 eV assigned to a Mie re…
Crystallization kinetics of polyethylene was studied using differential scanning calorimetry. Isothermal crystallization kinetics was analyzed using the Avrami equation. Non-isothermal crystallization kinetics was analyzed using different models, namely, the Avrami, Jeziorny, Ozawa, Nakamura, Dietz, and Kamal-Chu mode…
More pieces for the puzzle. The β-methylaspartate-α-decarboxylase (CrpG) from the cryptophycin biosynthetic pathway was cloned, over-expressed, and purified. We found that CrpG decarboxylates (2S,3R)-3-methylaspartic acid to form 3-amino-2(R)-methylpropionic acid, which is subsequently incorporated into Unit C of cryp…