Browsing by Author "Tawfik, S"

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    DEVELOPMENT OF PRINTING NATURAL FABRICS WITH CURCUMA NATURAL DYE VIA NANOTECHNOLOGY
    (INT JOURNAL PHARMACEUTICAL SCIENCES & RESEARCH, 2017-02) Mosaad, M. M; Abd-El Thalouth, J. I; Tawfik, S; Ragheb, A. A
    The present work is undertaken with a view to harness nanotechnology as one of the most important frontier sciences for development of printing natural fabrics using the most eco-friendly dyes, i.e. natural colors. Curcuma natural dye was studied to clarify the impact of nature of nano-size color particles on size, shape, and particle distribution of the natural dye with comparative studies of the K/S and over all fastness properties of printed samples on natural fabrics (wool, silk and cotton). Results showed that the K/S values of nano samples are higher than original samples, irrespective of the nature of the fabric used and /or the concentration of the coloring matter. Alum mordant incorporated with original curcuma can be omitted, and substituted by nano-curcuma without mordant. K/S values of the pre-mordanting acquired the higher values than the simultaneous mordanting irrespective of the fabric used, or dye particles size used, or curcuma concentrations on using tannic acid mordant. Color fastness to rubbing, and perspiration properties of nano dye is better than the original.
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    Technological Evaluation of Cellulose Carbamate Synthesized from Rice Straw and its Utilization as Dye Adsorbent
    (NAT INFORM & DOCUMENT CENTRE, 2016-02) Adel, E; Abd El-Salam, Sh; Tawfik, S; El-Hennawi, H. M; El-Thalouth, I
    EGYPTIAN rice straw was subjected to pulping via alkali.. scouring followed by hypochloric bleaching. The obtained cellulosic pulp was allowed to react with two different amounts of urea at high temperature to obtain cellulose carbamate acquire nitrogen content of 0.13 and 0.16 on using 10 and 20 g urea/100g cellulose, pulp, respectively. The obtained carbamate derivatives were evaluated as dye adsorbent for different reactive dyes. Different factors were investigated as the nature of colour used, the technique applied, the time of treatment, and concentration of dyes used. It wa s found that the magnitude of the adsorbed colour depends on the N %, whereas the % N increases the % colour removal increases too. As the concentration of the dye increases from 0.01 to 0.5g/1000ml, the colour removal % decreases regularly. It is clear from the obtained results that the % colour removal as well as the time to reach the maximum colour removal percent depend on: a) the nature of the reactive dye used, (b) the degree of carbamation expressed as % N and (c) the technique applied.