News Column

Tehran's univ. improves dyeingof polyamide fibers

August 24, 2014

 Science & Technology Desk

Amirkabir University of Technology's researchers have succeeded in surface alteration of polyamide fibers by polyamidoamine dendrimers and optimization of their dyeing properties.

Mohammad Dodangeh and Kamaleddin Qaranjig, members of Iran Color Institute, Mokhtar Arami, faculty member of Amirkabir University of Technology, and Saeed Atashrouz, the university's student, were researchers of the project.

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

gold nanoparticles

Researchers at Stanford University, USA, have demonstrated that high-resolution electron microscopy can be used to reveal a three-dimensional structure in which all gold atoms are observed.

The results are in close agreement with a structure predicted at the University of Jyvaskyla, Finland, on the basis of theoretical modeling and infrared spectroscopy.

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 Lawrence Berkeley National Laboratory, USA, and by mass spectrometry done at Hokkaido University, Japan, Redit said.

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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Source: Iran Daily

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