Preparation of water-dispersible graphene using N-methylmorpholine N-oxide monohydrate and its application for the preparation of nanocomposites using PEDOT

SEM and TEM images (inset: selective area electron diffraction (SAED) pattern) of mono-layered water dispersible graphene (GPN) sheet by treatment ofN-methylmorpholineN-oxide monohydrate (NMMOm).

SYNTHESIS OF GRAPHITE OXIDE (GO)/Cu2O NANOCOMPOSITE AND ITS CATALYTIC PERFORMANCE UNDER THE ULTRASOUND

GO/ Cu2O nanocomposite had been successfully synthesized by electrostatic interactions method. X-ray powder diffraction (XRD), transmission electron microscope (TEM), selective-area electron diffraction (SAED), Fourier transform infrared spectroscopy (FT-IR) and Raman spectra confirmed the structure of the Cu2O and GO/ Cu2O nanocomposite. The catalytic degradation of Rhodamine B under the condition of ultrasound was investigated and the result of UV-Vis spectroscopy demonstrated that the nanocomposite can efficiently degraded it.

Transmission Electron Microscopy Observations on the Precipitates in Al-Zn-Mg Based Sacrificial Anode Alloy

nanoscale precipitates in the Al-Zn-In-Mg-Ti-Mn alloy were investigated by regular and high resolution transmission electron microscopy (TEM and HRTEM) and by selective area electron diffraction (SAED). The cast alloy contains the hexagonal structure MgZn2 and the orthorhombic structure Al6Mn precipitates, but after aged the precipitates of the cubic structure Mg2Zn11 were found. The Mg2Zn11 precipitates can act as activation centre, make the alloy pitting. But the activation of Al6Mn precipitates is very little.

Microwave Activation of Exfoliation in Ion–cut Silicon Layer Transfer

Microwave heating is used to initiate the ion-cut process for transfer of coherent silicon-layers onto insulator substrates. Hydrogen and boron co-implanted silicon was bonded to an insulative substrate before processing inside a 2.45 GHz, 1300 W cavity applicator microwave system. Sample temperatures measured using a pyrometer were comparable to previous ion – cut studies. Selected samples were further annealed to repair any damage created in the ion implant process. Rutherford backscattering spectrometry and selective area electron diffraction patterns show high crystallinity in transferred layers. RUMP simulation of backscattering spectra and cross-sectional transmission electron microscopy demonstrate that thicknesses of the transferred layers are comparable to previous ion-cut exfoliation techniques. Surface quality as characterized by an atomic force microscope compares well with previous ion-cut studies. Hall measurements were used to characterize electrical properties of transferred layers. The mobility and carrier density of microwave activated ion – cut silicon on insulator processed samples compares well with previous annealing techniques.

The structure of trititanate nanotubes

A comprehensive chemical and structural analysis is made of a new type of trititanate nanotube, which is synthesized via the reaction of TiO2 particles with NaOH aqueous solution. It is found that the trititanate nanotubes are multi-walled scroll nanotubes with an inter-shell spacing of about 0.78 nm and an average diameter of about 9 nm. An atomic model of the nanotube is derived based on information from powder X-ray diffraction, selective-area electron diffraction, high-resolution electron microscopy and structure simulations. A model nanotube may be constructed by wrapping a (100) sheet of H2Ti3O7 along [001] with the tube axis parallel to [010].

Observation of Domains and Phase Separation in Hydrated Lipid Bilayers

The domain structure and phase separation in lipid single bilayers were observed directly by selective area electron diffraction (SAED) and selected reflection dark field electron microscopy (SRDFEM), using an environmental stage for a Siemens Elmiskop IA. The specimens were viewed in a fully hydrated state in the temperature range between 0°C and 50°C. Below the transition temperature, three orders of a hexagonal pattern were recorded, whereas diffuse rings only were seen above the transition temperature.Selective area electron diffraction were done by restricting the illumination area to few micrometers in diameter, using a pointed filament and a 10 μm second condenser aperture. Below the transition temperature of dipalmitoylphosphatidylchoiine bilayers, differentially oriented diffraction patterns were distinguishable between adjacent membranes areas (domains) five micrometers apart. Occasionally, two or more superimposed patterns were recorded from the same area, indicating the observation area covered several domains.