Bucharest, Romania
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Hritcu M.,Technical University Gheorghe Asachi | Radu C.-D.,Technical University Gheorghe Asachi | Ferri A.,Polytechnic University of Turin | Grigoriu A.,Technical University Gheorghe Asachi | Oproiu L.-C.,Institute of Chemical Research
Cellulose Chemistry and Technology | Year: 2013

This paper is part of a study on the development and design of some cellulose articles intended for certain cutaneous allergic diseases: contact dermatitis (CD) and atopic dermatitis (AD). The study is based on the utilization of 100% cotton supports grafted with a cyclodextrin product, namely monochlorotriazinyl-beta-cyclodextrin (MCT-P-CD), for the inclusion of some natural active principles (AP), such as Viola tricoloris Herba (VTH), menthol (Ml) and propolis (Pr),with anti-allergic properties. The cellulose support addressing patients with cutaneous affections realizes a system for the transdermal controlled release of the AP from the cavities of the cyclodextrin grafted on the cellulose support, to the hypoderm level of the skin. In order to highlight the grafting with cyclodextrin reactive product and the inclusion of anti-allergic AP, the cellulose support was characterized by Fourier transform infrared spectroscopy (FTIR) measurements and nitrogen elemental analysis, while the morphological formations were rendered evident through scanning electron microscopy (SEM). The humidity profile and conduction were determined by the utilization of a liquid miming the perspiration transfer through the textile material treated with anti-allergic AP, as compared to a standard.

Stan A.,National Institute for Aerospace Research Elie Carafoli | Dinca I.,Aerospace Consulting | Ban C.,National Institute for Aerospace Research Elie Carafoli | Ilina S.,National Institute for Aerospace Research Elie Carafoli | And 5 more authors.
Applied Mechanics and Materials | Year: 2012

The paper deals with the rheological properties of epoxy resin additivated with organically modified montmorillonites, carbon nanotubes and nanocarbon. The paper also presents the influence of nanoadditives over composites mechanical properties. The epoxy polymer is diglycidyl ether of bisphenol A (DGEBA) and the curing agent is an aliphatic tetraamine. Organically modified montmorillonites Cloisite 30B and Cloisite 93A, MWCNTs and laser synthesized nanocarbon were used to synthesize nanocomposites by dispersing each in an epoxy resin. The dispersion was achieved through mechanical and sonic methods. The epoxy resin additivated with nano-sized fillers was rheologically tested to study the dispersion influence. The sonic dispersion of nano-additives is observed to drastically influence the rheological behavior of the suspensions. Newtonian fluid behavior disapp ears as the additive loading increases. The work mentions the influence of nano-additives on the manufacturing process of epoxy /glass fibre and epoxy/ carbon fibre laminated composites. © (2012) Trans Tech Publications, Switzerland.

Gavrila Florescu L.,Romanian National Institute for Lasers, Plasma and Radiation Physics | Vasile E.,METAV | Sandu I.,Romanian National Institute for Lasers, Plasma and Radiation Physics | Soare I.,Romanian National Institute for Lasers, Plasma and Radiation Physics | And 7 more authors.
Applied Surface Science | Year: 2011

The work presents preliminary studies with the goal to extend the share of long graphene ribbons in laser-synthesized carbon black. Investigations revealed the existence, as a major constituent, of graphene ribbons composed of up to 10-15 graphene layers, spaced at ∼0.35-0.37 nm and of tens of nanometres in length. The samples used to study the development of this specific structure were obtained from sensitized acetylene-based mixtures and the experiments were performed following the variation of both the experimental parameters and gas composition. © 2010 Elsevier B.V. All rights reserved.

Florescu L.G.,Romanian National Institute for Lasers, Plasma and Radiation Physics | Dinca I.,National Institute for Aerospatial Research | Popovici E.,Romanian National Institute for Lasers, Plasma and Radiation Physics | Dumitrache L.,Institute of Chemical Research | And 7 more authors.
Journal of Optoelectronics and Advanced Materials | Year: 2010

Composites with epoxy matrix reinforced by carbon fibres and laser synthesized carbon nanostructures as additives were prepared and characterized. All the composites with a matrix of epoxy resin/carbon fibres revealed superior mechanical characteristics and the positive effect of carbon nanoadditives on the epoxy/carbon fibre matrix were observed both in mechanical characteristics and water resistance.

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