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Vasileios Koutsos - One of the best experts on this subject based on the ideXlab platform.

  • carbon nanotube epoxy resin composites using a block copolymer as a Dispersing Agent
    Physica Status Solidi (a), 2004
    Co-Authors: Michael Zaiser, Vasileios Koutsos
    Abstract:

    Strengthening of carbon nanotube/epoxy resin composites was achieved by adding a small amount of copolymer (0.03 wt% of epoxy resin) as a dispersant. Tensile testing was used to measure mechanical properties. Young's modulus and fracture stress of the carbon nanotube composites with the copolymer were found to be about 50% higher than for the pure epoxy resin, and about 20% higher than for the composite without the Dispersing Agent. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

  • Carbon nanotube/epoxy resin composites using a block copolymer as a Dispersing Agent
    Physica Status Solidi (A) Applied Research, 2004
    Co-Authors: Qianqian Li, Michael Zaiser, Vasileios Koutsos
    Abstract:

    Strengthening of carbon nanotube/epoxy resin composites was achieved by adding a small amount of copolymer (0.03 wt% of epoxy resin) as a dispersant. Tensile testing was used to measure mechanical properties. Young's modulus and fracture stress of the carbon nanotube composites with the copolymer were found to be about 50% higher than for the pure epoxy resin, and about 20% higher than for the composite without the Dispersing Agent. © 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Kazumi Danjo - One of the best experts on this subject based on the ideXlab platform.

  • design of self dispersible dry nanosuspension through wet milling and spray freeze drying for poorly water soluble drugs
    European Journal of Pharmaceutical Sciences, 2013
    Co-Authors: Toshiyuki Niwa, Kazumi Danjo
    Abstract:

    Abstract The purpose of the present research is to establish a novel nanosizing technique starting from wet nano-milling, named “dry nanosuspension” technique for poorly water-soluble drugs. The spray freeze-drying (SFD) method was applied instead of the spray-drying one previously developed. Drug particles were milled in the aqueous solution of Dispersing Agents using an oscillating beads-milling apparatus. The milled nanosuspension was sprayed to the surface of liquid nitrogen, and the resultant iced droplets were freeze-dried to obtain the powdery product. The loading ratio of a Dispersing Agent was investigated to enhance its reDispersing property. Dry nanosuspension, which could be spontaneously dispersed into original nanosuspension in water, was obtained by SFD process. It was assumed that self dispersion property would be attributed to its structure with porous network, in which the primary milled drug crystals were embedded. Such unique structure contributed greatly to immediate release behaviors of the drug in gastrointestinal buffered media. These pharmaceutical properties were enhanced by increasing the ratio of the Dispersing Agent to the drug and the solid content in suspension to be sprayed. The present technique via wet milling and spray freeze-drying processes would be a novel dissolution-enhanced technology for poorly water-soluble drugs.

Qianqian Li - One of the best experts on this subject based on the ideXlab platform.

  • Carbon nanotube/epoxy resin composites using a block copolymer as a Dispersing Agent
    Physica Status Solidi (A) Applied Research, 2004
    Co-Authors: Qianqian Li, Michael Zaiser, Vasileios Koutsos
    Abstract:

    Strengthening of carbon nanotube/epoxy resin composites was achieved by adding a small amount of copolymer (0.03 wt% of epoxy resin) as a dispersant. Tensile testing was used to measure mechanical properties. Young's modulus and fracture stress of the carbon nanotube composites with the copolymer were found to be about 50% higher than for the pure epoxy resin, and about 20% higher than for the composite without the Dispersing Agent. © 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Gisela De Aragao Umbuzeiro - One of the best experts on this subject based on the ideXlab platform.

  • exploring the use of biosurfactants from bacillus subtilis in bionanotechnology a potential Dispersing Agent for carbon nanotube ecotoxicological studies
    Process Biochemistry, 2014
    Co-Authors: Diego Stefani T Martinez, Andreia Fonseca De Faria, Elias Berni, Antonio Souza G Filho, Gilberto Almeida, Adria Calotooliveira, Matthew J Grossman, Lucia Regina Durrant, Gisela De Aragao Umbuzeiro
    Abstract:

    Abstract In this work, we evaluate the efficiency of biosurfactants produced by Bacillus subtilis LSFM-05 for the dispersion of acid-treated multi-walled carbon nanotubes (CNT-LQES 1 ) and the effect of dispersion on toxicity testing with Daphnia similis . Carbon nanotubes are very hydrophobic materials and they readily agglomerate in mineral water. As a result, in order to determine their toxicity it is critical to evaluate methods to disperse these nanomaterials in a biologically compatible manner. The biosurfactant used in this work, termed BioS, which is a mixture of the lipopeptides (surfactin and fengycin), was found to be non-toxic to D. similis in an acute toxicity test (48 h) and it was an excellent Dispersing Agent for CNT-LQES 1 in reconstituted mineral water. Monitoring in real-time using the nanoparticle tracking analysis (NTA) showed that the colloidal stability of the CNT-LQES 1 suspension dispersed with BioS was highly stable. These findings are encouraging for the application of biosurfactants as nontoxic dispersion Agents in the emerging fields of bionanotechnology and nanotoxicology.

Grzegorz Milczarek - One of the best experts on this subject based on the ideXlab platform.

  • kraft lignin as Dispersing Agent for carbon nanotubes
    Journal of Electroanalytical Chemistry, 2010
    Co-Authors: Grzegorz Milczarek
    Abstract:

    Abstract Kraft lignin (KL) was found to undergo strong adsorption on multi-walled carbon nanotubes (MWCNT) from aqueous/organic solutions. The MWCNT/KL composite could be re-dispersed in dimethyl sulfoxide to form a relatively stable suspension. Films of MWCNT/KL could then be obtained using this suspension in the casting method. A strong interaction of MWCNT and KL was confirmed by Raman spectroscopy. The adsorbed lignin served also as a redox polymer and the composite modified electrode after initial electrooxidation showed characteristic redox functions assignable to KL-derived quinone moieties. The redox activity of the MWCNT/KL composite could be employed to electrocatalyse the oxidation of dihydronicotinamide adenine dinucleotide (NADH) in a nearly neutral (pH 7.4) buffer or the reduction of iodate in acidic (pH 1.8) electrolyte.