Materials Literature
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The topology of crack tips in soda–lime–silicate glass was investigated using atomic force microscopy (AFM). Studies were conducted on cracks that were first propagated in water and then subjected to stress intensity factors either at or below the crack growth threshold. Exposure to loads at the crack growth threshold…
Complexation of a CuI ion in a mercuramacrocycle demonstrates the potential of metal–metal interactions in a preorganized system to trap metal ions. The molecular structure of the CuI complex is presented and shows Hg⋅⋅⋅Cu heterometallic and Hg⋅⋅⋅Hg homometallic d10⋅⋅⋅d10 interactions (see figure).
Microphase separation and morphology of thin films of ABC triblock terpolymers are studied with a self-consistent-field theory. Thin films of poly(styrene)- block -poly(2-vinylpyridine)- block -poly( tert -butyl methacrylate) (SVT) triblock terpolymers are modeled as A 3 B 4 C 12 Gaussian chains confined in a slit. Th…
Undoped and Al-doped ZnO films with dopant concentrations of nominally 1% and 10% and a thickness of 100 nm have been grown on ${\mathrm{SrTiO}}_{3}(001)$ by pulsed laser deposition at substrate temperatures between 650 \ifmmode^\circ\else\textdegree\fi{}C and 820 \ifmmode^\circ\else\textdegree\fi{}C. The epitaxial co…
It has been known that simply mixing single-walled carbon nanotubes (SWCNTs) in an aqueous solution of gelatin disperses SWCNTs well for a period of months. Gels made from the gelatin-SWCNT mixture are also stable and have a clear, black color. Scanning electron microscopy shows that gelatin molecules self-organize in…
ABSTRACT Load‐controlled fatigue tests were performed at 20 and 50 °C using two relative humidity levels of 55 and 80% to characterize the influence of humidity and temperature on the fatigue behaviour of an extruded AZ61 magnesium alloy. Fatigue tests were also conducted at 150 °C. No significant variation in fatigue…
We report a study of electronic excitations in manganites exhibiting a range of ground states, using resonant inelastic x-ray scattering (RIXS) at the Mn K edge. Excitations with temperature dependent changes correlated with the magnetism were observed as high as 10 eV. By calculating Wannier functions, and finite-q r…
ABSTRACT This paper presents the results of investigation of a nuclear reactor pressure vessel steel 15Kh2MFA of two strength levels under cyclic loading. The mechanism of microcrack formation on the surface and in the bulk of 15Kh2MFA steel under cyclic deformation was investigated. Analysis of the specimen surfaces…
The electrical conductivity and thermoelectric power of an uranium dioxide single crystal were measured between 908 and 1697 K and for P O2 included between 10 −24 atm and the boundary UO 2+ x /U 4 O 9 . For T <1273 K and near stoichiometry, the electrical conductivity versus P O2 shows a plateau characteristic of…
We report on the thin film phase behavior of poly(styrene)- block -poly(2-vinylpyridine)- block -poly( tert- butyl methacrylate) triblock terpolymers with volume fractions φ PS:φ P2VP:φ PtBMA scaling as 1:1.2: x, with x ranging from 3.05 to 4. On controlled annealing in the vapor of a nearly nonselective solvent the f…
The simple approach of UV-induced coupling of 4-vinylbenzyl chloride (VBC) with the hydrogen-terminated Si(100) (the Si−H) surface provided a stable Si−C bonded initiator monolayer (the Si−VBC surface) for the surface-initiated atom transfer radical polymerization (ATRP). Well-defined polymer−Si hybrids, consisting of…
The treatment of CdSe nanocrystals (NCs) in a 3-amino-1-propanol (APOL)/water (v/v = 10:1) mixture at 80 degrees C in the presence of O(2) causes them to undergo a slow chemical etching process, as evidenced by spectroscopic and structural investigations. Instead of the continuous blue shift expected from a gradual de…
The optical properties of single-crystalline α-Si3N4 nanobelts synthesized via catalyst-assisted pyrolysis of polymeric precursor were characterized by absorption, photoluminescence (PL) and photoluminescence excitation (PLE). The optical absorption spectrum showed that the nanobelts exhibited indirect absorption beha…
Porous mullite, formed by large spherical‐shaped pores evenly distributed within a mullite matrix, was processed by a direct consolidation method based on the starch swelling properties. Materials with porosities up to 60 vol% and with an average pore size of ∼30 μm were prepared. Porosity matched the starch volume fr…
To achieve the chemical recycling of flame-resisting materials consisting of poly( l -lactic acid) (PLLA), a safer flame-resisting material, PLLA/aluminum hydroxide {Al(OH) 3 } composite, was investigated the capability of the feedstock recyclability to optically active monomer l, l -lactide. The thermal stabilization…
We measured third-order nonlinear susceptibility (${\ensuremath{\chi}}^{(3)}$) spectra in semiconducting single-walled carbon nanotubes (SWNTs) by the $Z$-scan method. $|\mathrm{I}\mathrm{m}{\ensuremath{\chi}}^{(3)}|$ is remarkably enhanced under resonant excitation to the lowest interband transition, reaching $4.2\if…
Atomic correlation between adjacent graphene layers was elucidated for double-wall carbon nanotubes (DWNTs) through a chiral index assignment of two nested nanotubes by high-resolution transmission electron microscopy. Our analysis provides a rather constant diameter difference close to 0.75 nm but no chiral angle cor…
Increasing interest in oxide supported nanoparticle science and technology is stimulating research into controlling nanocrystal shape. Pd forms nanocrystals on the surface of SrTiO3(001), and depending on the crystallographic interface of the Pd with the substrate three shapes can be created: truncated pyramids, huts,…
The reaction of gold nanoparticles with a potassium periodate-sodium hydroxide-carbonate system undergoes chemiluminescence with three emission bands at 380-390, 430-450, and 490-500 nm, respectively. It was found that the light intensity increased linearly with the concentration of the gold nanoparticles, and the CL…
Abstract Polyurethane prepolymers are widely used in reactive hot melt adhesives and moisture cured coatings. NCO‐terminated polyurethane of polypropylene glycol (PPG)‐1000 and isophoron diisocyanate (IPDI) with an NCO/OH ratio of 1.2:1 were prepared without any catalyst or solvent. 1D and 2D NMR spectroscopy was used…