Materials Literature
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A single-phase β-sialon nanoceramic, Si5AlON7, has been prepared by high-energy mechanical milling, followed by spark plasma sintering. After milling, the starting powder mixture (Si3N4, AlN, Al2O3) was mostly transformed into an amorphous phase that contains a large number of well-dispersed nanocrystalline β-Si3N4 pa…
Abstract We report the synthesis and physical properties of novel fullerene–oligoporphyrin dyads. In these systems, the C‐spheres are singly linked to the terminal tetrapyrrolic macrocycles of rod‐like meso , meso ‐linked or triply‐linked oligoporphyrin arrays. Monofullerene–mono(Zn II porphyrin) conjugate 3 was synth…
Appreciable global efforts are underway to develop processes for fabricating three‐dimensional (3‐D) nanostructured assemblies for advanced devices. Widespread commercialization of such devices will require: (i) precise 3‐D fabrication of chemically tailored structures on a fine scale and (ii) mass production of such…
We have studied doping effects of hexagonal manganites ${\mathrm{Er}}_{1\ensuremath{-}x}{\mathrm{Y}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$, which are found to have 2D triangular spin structure for all the samples studied here. Upon doping Er at the Y site, the magnetic structure changes gradually from the ${\ensuremath{\Gam…
A high concentration of erbium doping was achieved in Y2O3 thin films on Si (100) by depositing Y2O3 alternatively with Er2O3 using radical-enhanced atomic layer deposition (ALD). Specifically, the erbium doping level was controlled by varying the ratio of Y2O3:Er2O3 cycles during deposition, and a 10:5 ratio yielded…
A staple from nickel‐titanium shape memory alloy for foot surgery was prepared by metal injection moulding (powder metallurgy). After a thorough characterisation with a multitude of physical, chemical, mechanical, and biological methods, the prototype appears to be well suited for clinical use where a shape‐memory eff…
Variegated palaeosols, which formed from weathering of clays, silts, and brackish to freshwater limestones, are present in the late Eocene-early Oligocene Solent Group of the Hampshire Basin, southern U.K. The detrital clay mineral suite is dominated by illite and illite-smectite with minor kaolinite and chlorite. In…
The cross-plane thermal conductivity of Ge2Sb2Te5, either in its amorphous state or fcc crystallized state, and titanium nitride (TiN) thin films has been measured at room temperature by the 3ω method. These materials are involved in the fabrication of phase change random access memory (PC-RAM), Ge2Sb2Te5 and TiN bein…
Recent experimental results (Zheng et al 2004 Science 303 661) have shown that a 1-3-type BaTiO 3 –CoFe 2 O 4 composite film exhibited a strong coupling between the ferroelectric and ferromagnetic order parameters. The coupling interaction in the nanostructured multiferroic film could be different from that in a bulk…
A problem of screening of electron–electron interaction by LO phonons is investigated for bound two-electron systems in bulk semiconductors and semiconductor quantum dots. We consider a D − centre and a two-electron quantum dot and obtain the effective LO-phonon-induced interaction between the electrons, i.e., V eff (…
The structure and equation of state of low albite, NaAlSi 3 O 8 , has been determined using high-pressure single-crystal X-ray diffraction to a maximum pressure of 9.43 GPa. Low albite remains triclinic in space group C1̄ over the entire pressure range and no phase transitions were observed although the evolution of t…
We report on the synthesis, characterization, and electrochemical application of Ca(OH)2-, Co(OH)2-, and Y(OH)3-coated Ni(OH)2 tubes with mesoscale dimensions. These composite tubes were prepared via a two-step chemical precipitation within an anodic alumina membrane under ambient conditions. The morphology and struct…
The oxidation states formed during low-temperature oxidation (T < 500 K) of a Ru(0001) surface are identified with photoelectron spectromicroscopy and thermal desorption (TD) spectroscopy. Adsorption and consecutive incorporation of oxygen are studied following the distinct chemical shifts of the Ru 3d(5/2) core level…
Abstract A simple route for fabricating highly ordered organic–inorganic hybrid nanostructures, using polystyrene‐ block ‐poly(ethylene oxide) diblock copolymer (PS‐ b ‐PEO) thin films coupled with sol–gel chemistry, is presented. Hexagonally packed arrays of titania nanodomains were generated by one‐step spin‐coating…
We have shown that fibrin-based small-diameter tissue-engineered blood vessels (TEVs) exhibited considerable mechanical strength and could withstand implantation in the jugular veins of lambs, where they remained patent for 15 weeks. The microtopology of fibrin matrix is influenced by the concentration of fibrinogen a…
Reaction of 3-aminopropylsilyl-modified ZnO microrods with trioctylphosphineoxide-coated CdSe/CdS core/shell nanocrystals in THF produces rod-shaped nanoparticle clusters that show directional photoemission that can be tuned with the size of the CdSe nanocrystals. The observed waveguiding effect of these microstructur…
A porphyrin-ferrocene dyad has been synthesized in which there is close face-to-face contact between the two aromatic systems, providing a model for heterobimetallic polymers based on the same repeating unit. Attempts to synthesize the 2:1 adduct instead led to a remarkable intramolecular Heck-type cyclization which p…
Electrostatic levitation and multi-beam radiative heating overcame contamination and sample position instability problems associated with handling of liquid alumina. This allowed the measurements of the surface tension and viscosity in the superheated and undercooled states using the oscillation drop method. Over the…
Abstract We report a new method to fabricate self‐organized nanoporous titania films (pore diameter ≈ 30 nm; ≈ 1100 nm thick) and ordered titania nanorod arrays (rod diameter ≈ 30–60 nm; 70–260 nm high) by combined anodizing of superimposed Al/Ti layers sputter‐deposited on glass substrates. The titania nanostructures…
This series of studies investigates the impact of thermophysiologial and sensorial properties and end-use conditions of heat-resistant protective workwear on the wear comfort response. In Part I of this paper, material features and test methods are screened to obtain fabric characteristics that explain wear comfort ef…