Now showing items 1-6 of 6

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      Encapsulation of methyl orange pH-indicator into a sol-gel matrix

      Zaggout, Farid R.; El-Ashgar, Nizam M.; Zourab, Shehata M.; El-Nahhal, Issa M.; Motaweh, Hanan (North-Holland, 2005)
      The acid catalyzed sol-gel reaction was used to encapsulate methyl orange pH-indicator into transparent monolithic silica matrices. Tetraethylorthosilicate was used for the entrapment of the methyl orange indicator. The ...
    • Encapsulation of Methyl Red pH‐Indicator into a Sol‐Gel Matrix

      Zaggout, Farid R.; El-Nahhal, Issa M.; Zourab, Shehata M.; El-Ashgar, Nizam M.; El‐dawahedy, Naji; Motaweh, Hanan (Taylor & Francis Group, 2005)
      Encapsulation of methyl red pH indicator into transparent monolithic silica matrices was made via the acid‐catalyzed sol‐gel reaction of tetraethylorthosilicate and methyl red indicator. The immobilized methyl red shows ...
    • Synthesis of silica nanocubes by sol-gel method.

      El-Ashgar, Nizam M.; El-Nahhal, Issa M; Zaggout, Farid R; Nassar, Mona A (orgz, 1999)
      This study investigated the effects of synthesis parameters such as water to alcohol (water/alcohol) ratios, types of alcohol and catalysts towards morphological properties of silica xerogels which were prepared according ...
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      Synthesis, characterization and applications of immobilized iminodiacetic acid-modified silica

      El-Nahhal, Issa M.; Zaggout, Farid R.; Nassar, Mona A.; El-Ashgar, Nizam M.; Maquet, Jocelyne; Babonneau, Florence; Chehimi, Mohamed M. (Kluwer Academic Publishers, 2003)
      Porous immobilized iminodiacetic acid modified silica of the general formula S—(CH2)3—N(CH2COOH)2, (where S represents [Si—O] n siloxane network) has been prepared by replacement of the iodide in 3-iodopropyl modified ...
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      Uptake of divalent metal ions (Cu2+, Zn2+ and Cd2+) by polysiloxane immobilized glycinate ligand system

      El-Nahhal, Issa M.; Zaggout, Farid R.; El-Ashgar, Nizam M. (Taylor & Francis Group, 2000)
      Porous solid siloxane polymer carrying glycinate functional group of formula –(CH2)3NHCH2COOH has been prepared by the sol-gel process. Treatment of aqueous solutions of divalent metal ions with the polysiloxane glycinate ...
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      Uptake of divalent metal ions (Cu2+, Zn2+, and Cd2+) by polysiloxane immobilized diamine ligand system

      Zaggout, Farid R.; El-Nahhal, Issa M.; El-Ashgar, Nizam M. (Taylor & Francis Group, 2001)
      Porous solid siloxane polymers carrying diamine functional group of formula P–(CH2)3NH–CH2CH2NH2 (where P–represents a silica-like siloxane framework) have been prepared by replacement of the iodine in iodopolysiloxane ...