Materials Literature
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Cryogenic deep rolling of metastable austenites is a new approach to achieve martensitic surface hardening of steel components. By combination of thermal and mechanical loads, more stable microstructures can be applied in the alternative heat-treatment-free production line referred to as cold surface hardening. Subseq…
Preisach model is a well‐known hysteresis identification method in which the hysteresis is modeled by linear combination of hysteresis operators. Although Preisach model describes the main features of system with hysteresis behavior, due to its rigorous numerical nature, it is not convenient to use in real‐time contro…
Au nanoparticles (NPs) forming a Au shell are coated on the surfaces of Ni microparticles (MPs) through a simple redox-transmetalation reaction, forming Ni/Au core-shell MPs. Then Au hollow spheres (HSs) are prepared by etching the Ni core in 1 mol L(-1) HCl solution. Surface-enhanced Raman scattering (SERS) spectrosc…
Titanium nitride (TiN) nanoparticles were obtained by calcining nanotubular titanic acid (NTA) in flowing ammonia. The morphology, crystal structure, and chemical features of as-prepared products were investigated by means of transmission electron microscopy, energy-dispersive X-ray spectrometry, X-ray diffraction, an…
Designing and building a full scale hydrogen storage system revealed several engineering challenges and also demonstrated the capabilities of complex hydrides. Three kg of hydrogen was stored in a four module system using modified sodium alanate as the storage media. Extensive testing of this system demonstrated the a…
The low temperature growth of crystalline PbS films has been achieved on plastic substrates by CVD using a xanthate. The possible mechanism involved in this low temperature deposition has been probed by density functional theory calculations.
Understanding detailed electric near-field distributions around noble metal nanostructures is crucial to the rational design of metallic substrates for maximizing surface-enhanced Raman scattering (SERS) efficiency. We obtain SERS signals from specific regions such as the ends, the sides and the entire surfaces of gol…
We have successfully prepared three crystalline conjugated rod–coil diblock copolymers of poly[2,7-(9,9-dihexylfluorene)]-block-poly(stearyl acrylate) (PF-b-PSA), PF7-b-PSA64, PF7-b-PSA93, and PF7-b-PSA166, via the combination of a Suzuki coupling reaction and atom transfer radical polymerization. The crystalline comb…
The structure of laser glasses in the system (Y(2)O(3))(0.2){(Al(2)O(3))(x))(B(2)O(3))(0.8-x)} (0.15 ≤ x ≤ 0.40) has been investigated by means of (11)B, (27)Al, and (89)Y solid state NMR as well as electron spin echo envelope modulation (ESEEM) of Yb-doped samples. The latter technique has been applied for the first…
Eu 3+ doped YBa 3 (PO 4 ) 3 series were successfully synthesized by conventional solid state reaction and their luminescence properties were investigated. The excitation spectra suggested that YBa 3 (PO 4 ) 3 :xEu 3+ presented a strong absorption in near-ultraviolet region. Under 393 nm excitation, YBa 3 (PO 4 ) 3 :xE…
Diphenylalanine, a key building block for organic nanotechnology, forms discrete, rigid and hollow nanotubes that are assembled spontaneously upon their dilution from organic phase into aqueous solution. Here we report the efficient preparation of several S-linked glycosylated diphenylalanine analogues bearing differe…
A method for radical coupling of porphyrins using copper(II) salts as one-electron oxidants was developed. A Zn(II)-porphyrin bearing an aminophenyl group yielded porphyrin oligomers, and two tri-arylporphyrins were oxidized to form doubly and triply linked dimers. Bromination of doubly linked dimers gave macrocycles…
Abstract: This research paper reports the effect of natural fiber content on the physical and mechanical properties as well as fracture behavior of composite cement reinforced with coconut fiber. The mix design was based on 1:1 for cement:sand ratio and 0.55 was fixed for amount of water per cement ratio. Coconut fibe…
We have investigated the slow dynamics of ultrasoft particles in crystalline cluster phases, where point particles interact through the generalized exponential potential u(r) = ε exp[−(r/σ)n], focusing on the cluster fcc phase of this model with n = 4. In an effort to elucidate how the mechanisms of mass transport dep…
ZnO:Al thin films were prepared on glass substrates by radio frequency RF magnetron sputtering from a ceramic ZnO target mixed with Al2O3 (1 wt%) in pure argon atmosphere with a power of 250 W. Two series of samples were deposited, the first one as a function of the substrate temperature (between 20 and 325 °C) at 0.1…
Using the unique ability of inelastic neutron scattering spectroscopy to quantify surface hydroxyls, it is shown that two hydroxyls are essential for the low temperature oxidation of CO over a model palladium catalyst.
The fascinating optical properties of nanostructured materials find important applications in a number of solar energy utilization schemes and devices. Nanotechnology provides methods for fabrication and use of structures and systems with size corresponding to the wavelength of visible light. This opens a wealth of po…
Carbides (TiC, WC, and NbC) nanoparticles fully encapsulated in the caves of carbon nanotubes (CNTs) were synthesized via an in situ reduction-carbonization route at 600∘C in an autoclave. The structural features and morphologies of as-obtained products were investigated using by X-ray diffraction, scanning electron m…
Photochromic polyurethanes (PPUs) are synthesised by reaction between a diarylethene end-capped with hydroxyl groups and an aliphatic diisocyanate. In situpolymerisation provides amorphous films with remarkable optical properties. The possibility to vary the amount and the chemical structure of the photochromic monome…
CuAu/HMS alloy nanoparticles constructed viaammonia-evaporation–deposition–precipitation were prepared and exhibited excellent performance in methyl glycolate synthesis.