Science & Technology Desk
Mohammad Dodangeh and Kamaleddin Qaranjig, members of Iran Color Institute,
Polyamide fibers include the nylons and aramid fibers. Both fiber types are formed from polymers of long-chain polyamides.
The modified fabrics were dyed with C I Acid orange 2.
Surface characteristics and dye-ability of treated fabrics were examined via color strength of dyed fabrics.
Results of the research showed that the hydrophobicity of the fabrics was increased and the dye-ability of the modified nylon improved, which could be attributed to bonding of amino functional groups on the surface.
Polyamide fibers are used in the manufacture of common household items, tire cord, rubber products, filters, fishing nets, brushes and cables. Textured threads made from polyamide fibers have become common.
The fibers have also application in agricultural and textile industries.
Breakthrough in imaging
The results are in close agreement with a structure predicted at the
The revealed gold nanoparticle is 1.1 nm in diameter and contains 68 gold atoms organized in a crystalline fashion at the center of the particle.
The result was supported by small-angle X-ray scattering done in
Electron microscopy is similar in principle to conventional light microscopy, with the exception that the wavelength of the electron beam used for imaging is close to the spacing of atoms in solid matter, about a tenth of a nanometer, in contrast with the wavelength of visible light, which is hundreds of nanometers.
A crucial aspect of the new work is the irradiation of the nanoparticle with very few electrons to avoid perturbing the structure of the nanoparticle.
The success of this approach opens the way to the determination of many more nanoparticle structures and to both fundamental understanding and practical applications.Tehran's univ. improves dyeingof polyamide fibers
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