Journal of Nanomaterials

International Publisher of Science, Technology and Medicine

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Rapid Induced Aggregation of Gold Nanoparticles by Diolefinic Dyes Research Article
Ahmed A Abo-Alhasan, Samy A El-Daly, Morad M El-Hendawy, Shahar H El-Khalfy and El-Zeiny M Ebeid
J Nanomater Mol Nanotechnol 2014, 3:2 doi:

Rapid Induced Aggregation of Gold Nanoparticles by Diolefinic Dyes

Aggregation kinetics of gold nanoparticles (Au NPs) interaction in the presence of some diolefinic dyes, namely 1, 4-bis (β-pyridyl-2-vinyl) benzene (P2VB), 1, 4 bis(2-methylstyryl) benzene (MSB) and 2, 5 distyrylpyrazine (DSP), were studied in methanol using steady state UV-Vis spectrophotometry and stopped-flow spectrophotometry. All three dyes induced the aggregation of Au NPs, but with different rates. The rate of interaction of P2VB and MSB with Au NPs were in time-scale of milliseconds, 6 ms-1 and 3.25 ms-1, respectively, while the interaction between DSP and Au NPs occurred in time-scale of minutes. The rates of interaction between Au NPs and these dyes go in the order of P2VB > MSB » DSP. The density functional theory (CAM-B3LYP) predicted that the dye with higher group charge on the terminal moieties possess higher affinity toward the aggregation as it strengthen its electrostatic interactions with the citrate-capped Au NPs.

Self-Assembling 1, 4, 5, 8-Naphthalentetracarboxylic Diimide- Microwires for Optoelectronic Devices Research Article
Dayne F Swearer, Noah M Johnson, Arben Kojtari and Hai-Feng Ji

Self-Assembling 1, 4, 5, 8-Naphthalentetracarboxylic Diimide- Microwires for Optoelectronic Devices

The widespread use of organic electronic devices requires simple yet effective synthesis techniques to create materials with low-cost and high performance. We report the solution phase crystallization of 1, 4, 5, 8-naphthalenetetracarboxylic diimide (NDI) microwires from dimethylsulfoxide. These microwires were characterized by means of scanning electron microscopy, thermal analysis, and infrared and fluorescence spectroscopies. The microwires were also characterized for their electrical properties and were shown to exhibit an n-type semi-conductive property as well as photoresponsive changes in conductivity. The electron mobility within the NDI microwires was determined to be lower than previous literature reports, yet the combination of photo-responsive changes in electrical conductivity may hold promise of photo-sensors, organic light-emitting diodes, and other optoelectronic devices.

Characteristics of Dielectric Dispersion in Epoxy/Polyhedral Oligomeric Silsequioxane Nanocomposites Research Article
Eed H and Zihlif AM
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CRC Press Inorganic Nanoparticles: Synthesis, Applications, and Perspectives (Nanomaterials and their Applications)
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IBM data storage device is 12 atoms in size!

by CarlKing

New Storage Device Is Very Small, at 12 Atoms
SAN JOSE, Calif. — Researchers at I.B.M. have stored and retrieved digital 1s and 0s from an array of just 12 atoms, pushing the boundaries of the magnetic storage of information to the edge of what is possible.
The findings, being reported Thursday in the journal Science, could help lead to a new class of nanomaterials for a generation of memory chips and disk drives that will not only have greater capabilities than the current silicon-based computers but will consume significantly less power. And they may offer a new direction for research in quantum computing

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CRC Press Inorganic Nanowires: Applications, Properties, and Characterization (Nanomaterials and their Applications)
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