Materials Literature
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Epitaxial graphene growth on SiC by Si selective etching using tetrafluorosilane (SiF 4 ) is introduced, where SiF 4 in Ar ambient selectively etches Si from the SiC surface at temperatures 1400 °C or above, leaving the C as graphene. Raman spectra of SiC treated in Ar for 60 min at 300 Torr did not show a graphene G-…
By using experiments and an intuitive model, this study reports on the dependence of different dipole resonances in gold nanoparticles (NPs) with rectangular, elliptical, and diamond-like footprints on the length of the three principal axes and on particle geometry. The length of the two in-plane principal axes of the…
ABSTRACT The failure process of an acrylic polyurethane coating in simulated sea water under a wet‐dry cyclic condition and immersion condition was studied with the methods of electrochemical impedance spectroscopy (EIS), Fourier transform infrared spectroscopy (FT‐IR), and scanning electron microscope (SEM). The resu…
In this work, the kinetics of “in situ” epoxidation of soybean oil with H 2 O 2 (30% w/w), catalyzed by phosphotungstic heteropoly acid [π‐C 5 H 5 N(CH 2 ) 15 CH 3 ] 3 [PW 4 O 16 ] (PHA) phase transfer catalyst and polyethylene glycol (PEG) as interfacial agent in dichloroethane, were investigated at 40, 50, 60, and 7…
Development and experimental testing of a peristaltic device actuated by a single shape-memory NiTi wire are described. The actuator is designed to radially shrink a compliant silicone pipe, and must work on a sustained basis at an actuation frequency that is higher than those typical of NiTi actuators. Four rigid, al…
Strong aggregation-caused quenching of perylene diimides (PDI) is changed successfully by simple chemical modification with two quinoline moieties through C=C at the bay positions to obtain aggregation-induced enhanced emission (AIEE) of a perylene derivative (Cya-PDI) with a large π-conjugation system. Cya-PDI is wea…
H2-promoted catalytic activity of oxide-supported metal catalysts in low-temperature CO oxidation is of great interest but its origin remains unknown. Employing an FeO(111)/Pt(111) inverse model catalyst, we herewith report direct experimental evidence for the spillover of H(a) adatoms on the Pt surface formed by H2 d…
Nanoparticles of the ZnxFe3−xO4 (x = 0.3–0.4) spinel phase having 5 and 15 nm size were synthesized by thermal decomposition of the respective acetylacetonates in a high boiling-point solvent employing surfactants. The collective behaviour of the nanoparticles was probed by dc and ac magnetic measurements of tightly c…
In this study, linear poly(ethylene glycol) (PEG) and novel linear-hyperbranched, amphiphilic polyglycerol (hbPG) polymers with cholesterol (Ch) as a lipid anchor moiety were radiolabeled with fluorine-18 via copper-catalyzed click chemistry. In vivo investigations via positron emission tomography (PET) and ex vivo bi…
Objective: Telmisartan (TMS), an angiotensin II receptor antagonist used for the prevention and treatment of hypertension has a very low solubility in water, so its dissolution rate is low . The aim of this study is to improve the water solubility and dissolution rate of TMS by telmisartan-oxalic acid (TMS-OXA) co-cry…
Five new complexes of formula K 4 [Pd 2 (mpba) 2 ] · 4H 2 O ( 1 ), {[K 4 (H 2 O)(dmso)][Pd 2 (mpba) 2 ]} ( 2 ), {[Cu(bpca)] 4 [Pd 2 (mpba) 2 ]} · 6H 2 O ( 3 ), {[Cu(bpca)] 2 [Pd(opba)]} · 1.75dmso · 0.25H 2 O ( 4 ), {[Cu(bpca)] 2 [Pd(opba)]} n · n dmso ( 5 ) [H 4 mpba =1,3-phenylenebis(oxamic acid), H 4 opba = 1,2-phe…
Abstract Au nanoparticles supported on nanostructured ceria‐alumina mixed oxides (10 and 30 wt % ceria) were prepared by a deposition–precipitation method. Their properties were studied by N 2 adsorption, XRD, TEM, X‐ray photoelectron spectroscopy, and UV/Vis spectroscopy under temperature‐programmed reduction or oxid…
Abstract The basic aspects of rare earth oxides (REOs) that affect their capacity for direct NO decomposition catalysis were investigated. A correlation between crystal structure and catalytic activity was found, which is related to the NO adsorption ability of the REOs. The crystal structure was the most important fa…
A series of novel self-assembling star-blocks consisting of M w = 29 000 g/mol 3-arm polyisobutylene (PIB) stars and oligo(β-alanine) end segments were synthesized and characterized. Star–blocks containing β-alanine dimers are viscous liquids, while those with tri-, tetra-, and penta(β-alanine)s are elastic solids. Ac…
We prepared the composite gels from polymer-brush-afforded silica particles (P-SiPs) and an azobenzene-doped liquid crystal, and investigated their inner structure, dynamic viscoelastic properties, thermo- and photoresponsive properties, and self-healing behaviors. It was found that the composite gels had a sponge-lik…
Deformation of a fluid interface caused by the presence of objects at the interface can lead to large lateral forces between objects. We explore these fluid-mediated attractive force between partially submerged vertical cylinders. Forces are experimentally measured by slowly separating cylinder pairs and cylinder trip…
The corrosion susceptibility of an age-hardened aluminum alloy in different processing conditions, especially after a single pass of equal-channel angular pressing (ECAP), is examined. The main question addressed is how corrosive attack is changed by strain localization. For that purpose, an AlMgSi0.5 alloy with a str…
Controlled delivery of hydrophilic proteins is an important therapeutic strategy. However, widely used methods for protein delivery suffer from low incorporation efficiency and loss of bioactivity. The versatile interfacial polyelectrolyte complexation (IPC) fibers have the capacity for precise spatiotemporal release…
In this study, we propose a theoretical model to compute the effective thermal conductivity of metal and dielectric spherical particle reinforced composites with interfacial thermal resistance. We consider a wide range of filler volume fraction with sizes ranging from nano- to macro-scale. The model, based on the diff…
Characterizing structural distortions in the metastable spin states of d 4 –d 7 transition metal ion complexes is crucial to understand the nature of their bistability and eventually control their switching dynamics. In particular, the impact of the Jahn–Teller effect needs to be assessed for any electronic configurat…