INTRODUCTIONThe plasma cold gases are often used for refining polymers' surface and also recently for refining the textile cloths made from natural and artificial fibers [1][2][3] . The plasma operations could effectively change the features of polymer's surface such as water absorption, adhesion and surface energy. The operations done by different gas plasmas could widely change the water absorption from moderate hydrophilic to high hydrophilic. In fact, plasma, depending on the experiment conditions, could result in these four effects i.e., purification (removal of organic contaminations), corrosion (removal of polymer materials and polymer destruction), create cross link bond (free radicals formation and make macromolecules branching), Forming new level of functional groups at a high depth of 10 nm 1,4,5 . Advantages of plasma operation are as follows; it modifies the farthest outer part of a thin surface layer while keeping the mass particulars unchanged, has the lowest chemical consumption and the highest safety, does not produce sewage, has the smallest effect on the environment and in the ecology of the textile mills 6,7 . Plasma operation with other noble gases results in the production of various functional groups. In this method, modifying the plasma operation, due to plasma's limited-like In this paper, a bleached well cotton sample was dyed with cold and hot reactive dyes and subsequently, the dyed samples were exposed to plasma condition containing nitrogen gas at 1 and 5 min of plasma exposure time. The effect of plasma on surface morphology was studied by scanning electronic microscope. The K/S and L* a* b* values were evaluated using a reflective spectrophotometer and consequently, the experiments showed that the sample dyed with reactive yellow 3 and reactive yellow 105 enjoys dye fastness which decreases after being washed due to the increase in the operation time of plasma. In addition, the increase in plasma operation time at constant pressure would increase the destructing effect on the surface morphology of samples dyed with hot and cold reactive. Finally, the Fourier transform Infra-red spectroscopy test showed the effect of plasma operation on determining the dye fastness and the change in existent functional groups in fabric after being washed. Effect of Nitrogen Gas Cold Plasma on Cotton Fabric Dyed with Reactive Dyes
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