Materials Literature
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The great escape: A biocontrolled gated material has been prepared by grafting a lactose derivative onto the pore outlets of a mesoporous support. The galactosidase-induced hydrolysis of the β1→4 glycosidic bond in the lactose moiety (red box in picture) allows the release of a dye entrapped in the pores of the hybrid…
Magnetic nanoparticles (MNP) can be used as contrast-enhancing agents to visualize tumors by magnetic resonance imaging (MRI). Here we describe an easy synthesis method of magnetic nanoparticles coated with polyethylene glycol (PEG) and demonstrate size-dependent accumulation in murine tumors following intravenous inj…
We have studied the electron transport behavior of electrochemically gated graphene transistors in different solutions. In an ionic liquid, we have determined the electron and hole carrier densities and estimated the concentration of charged impurities to be (1-10) x 10(12) cm(-2). The minimum conductivity displays an…
Isolated graphene sheets were achieved by graphite intercalation and charge-induced exfoliation. The resultant graphene oxide sheets were incorporated into polymer composites and thermal expansion was investigated by a thermo-mechanical analyzer. The test results indicated that inclusion of graphene into composites re…
We report a new approach to cisplatin storage and release using porous hollow nanoparticles (PHNPs) of Fe(3)O(4). We prepared the PHNPs by controlled oxidation of Fe NPs at 250 degrees C followed by acid etching. The opening pores ( approximately 2-4 nm) facilitated the cisplatin diffusion into the cavity of the hollo…
We have measured resonance Raman spectra with greatly suppressed fluorescence (FL) background from rhodamine 6G (R6G) and protoporphyrin IX (PPP) adsorbed on graphene. The FL suppression is estimated to be approximately 10(3) times for R6G. The successful observation of resonance Raman peaks demonstrates that graphene…
Despite the increasing use of semiconductor nanocrystals (quantum dots, QDs) with unique size-controlled optical and chemical properties in (bio)analytical detection, biosensing and fluorescence imaging and the obvious relevance of reliable values of fluorescence quantum yields for these applications, evaluated proced…
This perspective reviews recent developments in the synthesis, electrochemistry, and optical properties of gold nanoparticles, with emphasis on papers initiating the developments and with an eye to their consequences. Key aspects of Au nanoparticle synthesis have included the two-phase synthesis of thiolated nanoparti…
Photoacoustic absorption (PA) spectroscopic and electron paramagnetic resonance (EPR) studies were carried out on 2.5% copper doped sodium-barium borosilicate glasses. It was found that the Jahn-Teller distorted Cu 2+ species was present in a distorted octahedron with elongated z axis with the unpaired electron in d x…
The blast load response of precise bolt finite element model was studied by LS-DYNA software. Firstly, the initial stress of thread was added by the dropping temperature method. Then the dynamic response and deformation damage of the bolt model were calculated by the elastic-plastic constitutive material equation and…
An experimental study of pre-breakdown current in air-solid interface subjected to a 50-Hz AC voltage at atmospheric pressure is presented. The results show that the pre-breakdown current is in the form of pulses. We characterize these currents by the shape the pulses, their magnitude and the associated charge. The pr…
With plating bar pitch becoming finer, the risk of ion migration on package surface under temperature humidity bias (THB) tests will be raised. In our research on fine pitch products with operating voltages of 1.5 V, 1.8 V and 3.3 V, the effects of plating bar spacing and layout that may affect ion migration on the pa…
Individual multiwalled carbon nanotube (CNT) emitters were fabricated on a Si substrate by electron-beam lithography. The CNT emitter had seven anodes with orientation θ ranging from 0–60° with respect to the CNT axis. Field-emission experiments revealed that the emission current I was largest along the θ= 0° directio…
Amorphous diamond-like carbon (DLC) films prepared by the plasma chemical method on glass substrates SiO 2 -Al 2 O 3 -TiO 2 have been studied by Raman spectroscopy. W-doped DLC films show a considerable increase in the G -band frequency up to 1592 cm −1 and an enhanced surface hardness. The DLC films doped with W and…
Recently, independent research was carried on evaluation of domestic VPI insulating materials and consequently simulated stator. In this paper, lots of experiments were executed to verify and evaluate the VPI insulation materials and insulation system domestic. Raw materials were measured regarding thermal, chemical,…
The study of glasses in the series (35-x)BaO: 65P 2 O 5 : x MgO has been carried out. The protonic conductivity is observed to increase with addition of MgO up to 20 mol% and decreases beyond this composition. The addition of Mg 2+ ions make the glass structure more open and increase the hopping of H + ions. This is s…
Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009
Hydrogen storage materials can form more than one hydride phase. These different phases, in turn, display different hydrogen absorption/desorption capacities, kinetics, and stabilities. Studies aimed at characterizing and improving these materials usually need to correlate hydrogen intake with the precise determinatio…
A nanoporous composite carbon material was developed; this material was prepared by the synthesis of catalytic filamentous carbon (CFC) on a Ni catalyst supported onto the Sibunit carbon support. The texture characteristics (specific surface area and pore structure) of this material were studied. The effects of the co…
Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009