Materials Literature
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Abstract A new method for collecting complete three-dimensional electron diffraction data is described. Diffraction data is collected by combining electron beam tilt at many very small steps, with rotation of the crystal in a few but large steps. A number of practical considerations are discussed, as well as advantage…
Cellulose nanocrystals (CNCs) are gaining interest as a "green" nanomaterial with superior mechanical and chemical properties for high-performance nanocomposite materials; however, there is a lack of accurate material property characterization of individual CNCs. Here, a detailed study of the topography, elastic and a…
Graphene has generated great sensation due to its amazing properties, and extensive research is being pursued on single- as well as bi- and few-layer graphenes. In this Perspective, we highlight some aspects of graphene synthesis, surface, magnetic, and mechanical properties, as well as effects of doping and indicate…
Slow magnetic relaxation is observed for [(tpa(Mes))Fe](-), a trigonal pyramidal complex of high-spin iron(II), providing the first example of a mononuclear transition metal complex that behaves as a single-molecule magnet. Dc magnetic susceptibility and magnetization measurements reveal a strong uniaxial magnetic ani…
The mechanism of high-temperature superconductivity in the newly discovered iron-based superconductors is unresolved. We use spectroscopic imaging-scanning tunneling microscopy to study the electronic structure of a representative compound CaFe1.94Co0.06As2 in the "parent" state from which this superconductivity emerg…
The reactivity of graphene and its various multilayers toward electron transfer chemistries with 4-nitrobenzene diazonium tetrafluoroborate is probed by Raman spectroscopy after reaction on-chip. Single graphene sheets are found to be almost 10 times more reactive than bi- or multilayers of graphene according to the r…
Using reduced graphene oxide (RGO) as a two-dimensional support, we have succeeded in selective anchoring of semiconductor and metal nanoparticles at separate sites. Photogenerated electrons from UV-irradiated TiO(2) are transported across RGO to reduce silver ions into silver nanoparticles at a location distinct from…
Polymer solar cells (PSCs) are commonly composed of a blend film of a conjugated polymer donor and a soluble C(60) derivative acceptor sandwiched between an ITO anode and a low-workfunction metal cathode. Poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) are the most widely used dono…
Tensile recoveries of PET and PTT multifilament are measured by the variations of time for extension and recovery. The correlations depicted graphically are given for PTT and PET, respectively. It has been found that the recoveries of both PTT and PET are sensitive to the time for extension and recovery. PTT is slower…
Ar-filled bubbles in an oxide-dispersion-strengthened (ODS) alloy were characterized by analytical transmission electron microscopy. Energy dispersive X-ray analysis combined with nanoscale imaging was employed for quantitative analysis of Ar gas locked in a bubble 6 nm in size. As the Ar bubbles are formed at the ODS…
Elemental powders of Co, Ni and Al in the proper amounts to obtain Co(35)Ni(40)Al(25) and Co(40)Ni(35)Al(25) nominal compositions were ball milled in a high-energy mill for 80 h. After 40 h of milling, the formation of a Co (Ni, Al) solid solution with f.c.c. structure was verified by a change of the original lattice…
Al-doped ZnO sintered bodies, which were doped with 0–2 mol % Al 2 O 3 , were prepared from a powder mixture. Al could dissolve in ZnO grains uniformly and a fraction of Al tended to segregate along ZnO grain boundaries when the Al concentration was low. The decrease in the [ c / a ] lattice ratio suggested that the s…
Solvent effects on luminescence in nanocolloids are typically related to changes in the dielectric constant around the light-emitting species, but they can have a completely different nature in complex dynamic nanoscale assemblies. Hybrid superstructures were assembled from Au nanoparticles (NPs) and CdTe nanowires (N…
A theoretical and experimental study of isolated nanoparticles of II-VI semiconductor materials has been done. Using the framework of the effective mass model, the optical absorption spectrum of distributions of spherical quantum dots, freestanding, and under compressive or tensile stress, has been examined theoretica…
Inorganic-organic hybrid crystals containing α-octamolybdate (Mo8) or hexamolybdate (Mo6) were isolated by using hexadecyltrimethylammonium (C16) surfactant. The packing mode of the inorganic layers depended on a difference in the polyoxomolybdate molecular structure. The structure for both crystals consisted of alter…
Nanocrystalline CeO 2 −Tb 2 O 3 composite oxides films with various morphologies were prepared by electrodeposition under different conditions. These samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy (RS), and X-ray photoelectron spectroscopy (XPS). The magne…
In the present article graft copolymerization of methyl methacrylate (MMA) onto Agave americana fiber has been carried out in air in the presence of ceric ammonium nitrate (CAN) as redox initiator. The various reaction parameters such as reaction time, temperature, and concentration of initiator, nitric acid, and mono…
Nanocrystalline Si/SiO(2) multilayers-based electroluminescent devices were prepared on nano-patterned p-Si substrates which were fabricated by nano-sphere lithography technique. The formed nano-patterned substrate contains periodic Si nano-cone arrays with the height of 80 approximately 95 nm and the diameter around…
The magnetic exchange parameter (J) of a series of neutral and oxidized trinuclear extended metal atom chain complexes [M(3)(dpa)(4)Cl(2)](0/1+), where dpa is the anion of di(2-pyridyl)amine, has been extracted employing the complete active space second-order perturbation theory (CASPT2). The computed magnetic couplin…
The acid/base properties, critical micelle concentrations (cmcs), and pH-dependent solubility of five synthetic tetraacids have been studied at several ionic strengths (20-600 mM NaCl) and in the pH range of 1.5-11 using high precision potentiometric titrations, tensiometer measurements, and UV spectroscopy, respectiv…