76,445 research outputs found
ADSORPTION FROM MIXED-SOLUTIONS OF POLYVINYL PYRROLIDONE) AND SODIUM DODECYL-SULFATE ON TITANIUM-DIOXIDE
No full textAdsorption of sodium dodecyl sulfate (SDS) and poly(vinyl pyrrolidone) (PVP) from their mixed solutions onto a titanium dioxide (TiO//2) surface shows synergistic effects at low SDS concentrations and antagonistic effects at high SDS concentrations. It is suggested that this is due to complex formation between SDS and PVP: surface complexes at low SDS concentration and solution complexes at high SDS concentration.Chemistry, PhysicalSCI(E)EI31ARTICLE2185-1911
THE EFFECT OF TRITON X-100 ON THE STABILITY OF POLYSTYRENE LATTICES
No full textThe effect of a nonionic surfactant, Triton X-100, on the stability of monodisperse polystyrene latices was investigated. It was found that at high surfactant concentration, coagulation rather than stability was induced by the presence of the surfactant. A depletion flocculation mechanism is suggested to interpret the destabilization of polystyrene latices in concentrated micellar solution of Triton X-100.Chemistry, PhysicalSCI(E)EI38ARTICLE11-72
Fabrication of an organic thin-film transistor by direct deposit of a pentacene layer onto a silicon substrate
No full text[[abstract]]Contrary to the conventional bottom-contact and top-contact structure, a new organic thin-film transistor structure has been developed in this work based on good crystallinity of the pentacene layer and on large grain sizes. Both these characteristics are obtained when the material is deposited directly onto a silicon substrate. In addition to depositing the pentacene layer at the bottom of the transistor, we adopted an HfO2 and Si3N4 stack as the gate dielectric using sputtering to lower the operation voltage and to reduce the gate leakage current. This proposed organic thin-film transistor shows an acceptable carrier mobility of 0.21 cm(2) V-1 s(-1) and a threshold voltage of -7V. Because the gate dielectric is placed on top of the pentacene active layer, the new structure has a five-fold life-time improvement when compared with a conventional organic thin-film transistor without a passivation layer. (c) 2007 Elsevier Ltd. All rights reserved.[[note]]SC
MIXED ADSORPTION OF SODIUM DODECYL-SULFATE AND ETHOXYLATED NONYLPHENOLS ON CARBON-BLACK AND THE STABILITY OF CARBON-BLACK DISPERSIONS IN MIXED-SOLUTIONS OF SODIUM DODECYL-SULFATE AND ETHOXYLATED NONYLPHENOLS
No full textAdsorption of sodium dodecyl sulfate (SDS) and ethoxylated nonylphenols (NP-12, NP-40 and NP-100) from their mixed solutions on carbon black and the stability of carbon black dispersions in SDS-NP mixed solutions have been investigated. The adsorption isotherms of either SDS or NP alone on the surface of carbon black are shown to be of the Langmuir type, and the amount of NP adsorbed decreased with increasing number of ethylene oxide (EO) units in the NP molecules. In the mixed solutions of SDS and NP, the adsorption of both SDS and NP on carbon black decreased in the presence of the other component, and the amount of one component adsorbed varied in an inverse-linear relationship with that of the other, indicating a displacement mechanism of adsorption for the two surfactants on carbon black. The stability of carbon black dispersions in mixed solutions of SDS and NP was demonstrated to be consistent with the displacement mechanism of the mixed adsorption.Chemistry, PhysicalSCI(E)EI28ARTICLE3215-2216
Himpunan surat edaran MA (SEMA) dan peraturan Mahkamah Agung (PERMA) RI th. 1951-1997/ MA. RI
No full textxxiv, 833 hal; 25 cm
Transcranial direct current stimulation (tDCS) in Anxiety Disorders
No full textTranscranial direct current stimulation (tDCS) is a well-established noninvasive brain stimulation tool that allows to stimulate the cerebral cortex. In the current chapter, we examined all available research using this neurostimulation technique for the treatment of specific phobias, social anxiety disorder, panic disorder, agoraphobia, and generalized anxiety disorder. Overall, our work provides preliminary evidence that both excitatory stimulation of the left prefrontal cortex and inhibitory stimulation of the right prefrontal cortex can reduce symptom severity in anxiety disorders, although the low number of high-quality investigations in this field does not allow to make definite conclusions
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