Materials Literature
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Reduced graphene oxide (rGO) sheets are synthesized and tunneling junction devices are fabricated with an aluminum oxide layer inserted in between electrodes and rGO sheets. Differential conductances, revealing density of states (DOS), of rGO sheets are measured in a wide voltage range. A difference in DOS of rGO shee…
Two new triterpenes of the taraxasterol skeleton are isolated for the first time form Pergularia tomentosa L. of Algerian origin. The new compounds were named pergularine A and pergularine B. In addition, eight known compounds were isolated from the plant including oleic acid, (9Z,12Z)-octadecadienoic acid, α-amyrin,…
Abstract Compound Na[Cu(en) 2 ] 2 [HW 7 O 24 ] · 5H 2 O ( 1 , en = ethanediamine), as the first example of a heptatungstate polymer, has been synthesized in H 2 O/dmso and characterized by single‐crystal X‐ray diffraction, IR, UV/Vis, and ESI‐MS. The [HW 7 O 24 ] 5– cluster in 1 , as an inorganic hexadentate ligand, c…
A dissolution model that integrates the solid-liquid interface kinetics and the mass transport kinetics is introduced. Such a model reduces to the Noyes-Whitney equation under special conditions, but offers expanded range of applicability and flexibility fitting dissolution profiles when interfacial kinetics and inter…
Abstract A new zinc phthalocyaninate, bearing four flexible phenanthroline‐containing 30‐membered rings was synthesized by template condensation of a macrocyclic phthalonitrile. The resulting phthalocyanine was an insoluble aggregate. However, in the presence of Cu I ions, the formation of a soluble complex was observ…
We are reporting the atomic force microscope (AFM) nanomanipulation of ultrasonically dispersed and reflux-oxidized multiwalled carbon nanotubes (MWCNT) and single walled carbon nanotubes (SWCNT) by controlling the AFM tip with a NanoManipulator on a silicon substrate. The structure and the morphology of the carbon na…
The functionalization of chitosan with carboxymethyl groups allows zwitterionic or anionic chitosan derivatives to be obtained as a function of the degree of substitution. Here, we show that polyelectrolyte multilayers of chitosan and carboxymethylchitosan can be assembled by "dipping" or "spraying" to form strongly h…
Abstract Optical properties in (C 4 H 9 NH 3 ) 2 PbBr 4 single crystals under high density excitation have been investigated by photoluminescence (PL) spectroscopy. The PL bands associated with the Γ 1 , Γ 2 and Γ 5 excitons and the biexcitons have been observed. While the Γ 2 exciton and biexciton PL intensities are…
Uridine phosphorylase (UDP, EC 2.4.2.3), a key enzyme in the pyrimidine salvage pathway, catalyses the reversible phosphorolysis of uridine to uracil and ribose 1-phosphate. The gene expression of UDP from Shewanella oneidensis MR-1 was performed in the recipient strain Escherichia coli. The UDP protein was crystalliz…
To track dehydration behavior of cavansite, Ca(VO)(Si 4 O 10 )·4H 2 O [space group Pnma, a = 9.6329(2), b = 13.6606(2), c = 9.7949(2) Å, V = 1288.92(4) Å 3 ] single-crystal X-ray diffraction data on a crystal from Wagholi quarry, Poona district (India) were collected up to 400 °C in steps of 25 °C up to 250 °C and in…
A novel synthetic methodology for preparing amide conjugates of the DO3A-N-(α-amino)propionate chelator is described, using the synthesis of the DO3A-N-(α-benzoylamido)propionate chelator as an illustrative example. The model Gd[DO3A-N-(α-benzoylamido)propionate] chelate displays accelerated water exchange, stability…
One of the most common causes of IC failure is interconnect electromigration (EM), which exhibits a rate that is exponentially dependent on temperature. As a result, EM rate is one of the major determinants of the maximum tolerable operating temperature for an IC and of resulting cooling costs. Previous EM models have…
We have investigated the plasmon dispersion in quasi-free-standing monolayer graphene (QFMLG) and epitaxial monolayer graphene (MLG) layers by means of angle resolved electron energy loss spectroscopy. We have shown that various intrinsic p- and n-doping levels in QFMLG and MLG, respectively, do not lead to different…
We show a large magnetoresistance (MR) effect in a graphene heterostructure consisting of a metallic and semiconductor-type armchair-graphene-nanoribbon. In the heterostructure, the transmission across the first subband of the semiconducting armchair-graphene-nanoribbon and metallic armchair-graphene-nanoribbon is for…
Abstract We present the fabrication of three‐dimensional graphene structures supported by a polymer scaffold. The structures are fabricated using transfer printing. The structures could have potential applications in electronics, sensing and electrochemical electrodes. Electrochemical measurements confirm an increase…
We present in situ topographical observations of film growth during the initial cycles of atomic layer deposition (ALD) using scanning tunneling microscopy (STM). We present cycle-by-cycle STM topographs of zinc sulfide films during ALD on Au(111) surfaces, tracking individual grains, 5 nm in diameter, as they grow ov…
The crystal chemistry and crystal structure of hambergite from the Anjanabonoina mine, Madagascar [Be 2 BO 3 (OH) 0.96 F 0.04 , Z = 8, a = 9.762(2), b = 12.201(2), c = 4.430(1) Å, V = 527.6(2) Å 3 , space group Pbca], were reinvestigated by means of electron microprobe analysis in wavelength-dispersive mode, secondary…
Most micro-channel fabrication strategies generate nano-to-micro-scale, stochastic surface roughness. This inherent stochasticity can potentially be harnessed to direct microfluidic operations such as self-cleaning behavior and localized mixing. This work investigates the effect of stochastic nanoscale roughness on lo…
Here, we propose the device platform of energy domain transfer using a magnetoelectric microcantilever. By incorporating Tb0.3Dy0.7Fe1.9 (Terfenol-D) magnetostrictive materials onto a Pb(Zr0.52Ti0.48)O3 (PZT) piezoelectric microcantilever, we demonstrated energy conversion from the magnetic to the electric domain. By…
Due to their large blocking stresses, high recovery strains, and solid-state operation, nickel–titanium actuators can offer substantial weight and space savings relative to traditional electric or hydraulic systems. A challenge surrounding NiTi-based actuators is integration of the NiTi components into a given system;…