Entity

Time filter

Source Type


Abu-Saied M.A.,Advanced Technologies and New Materials Research Institute ATNMRI | Abu-Saied M.A.,King Saud University | Abdel-Halim E.S.,National Research Center of Egypt | Abdel-Halim E.S.,King Saud University | And 3 more authors.
International Journal of Electrochemical Science | Year: 2013

Acrylonitrile (AN) was homopolymerized to polyacrylonitrile (PAN) using potassium persulphate as an initiator. The cyano groups of AN chains were iminated through treating AN with polyethyleneimine (PEI) in an aqueous solution. Iminated polyacrylonitrile (IPAN), characterized by chemical analysis, fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) studies, was used as an adsorbent for the removal of Methylene Blue (MB) dye from its aqueous solutions. All factors affecting the adsorption of MB onto the adsorbent IPAN, like agitation duration, temperature, adsorbent dose and the initial concentration of dye solution were extensively studied. Two adsorption isotherm models, namely Langmuir model and Freundlich model were applied to the adsorption data. The adsorption data fitted well to both models. The Langmuir adsorption capacity (Qo) was found to be 54 mg/g. Freundlish constants, KF and n, were found to be 1.459 and 1.7, respectively. The results of the desorption study show that 92% of the adsorbed dye could be desorbed when shaking the dye-loaded adsorbent with distilled water for three hours at 40°C. © 2013 by ESG. Source


Abdelrazik T.M.,Advanced Technologies and New Materials Research Institute ATNMRI | Abdelrazik T.M.,Institute of Experimental Pharmacology and Toxicology | Valachova K.,Institute of Experimental Pharmacology and Toxicology | Mohyeldin M.S.,University of Jeddah | Soltes L.,Institute of Experimental Pharmacology and Toxicology
Journal of Applied Pharmaceutical Science | Year: 2016

In this study, new cinnamyl chitosan schiff base was evaluated as antioxidant material. Antioxidant activity was measured by two different popular methods (uninhibited/inhibited hyaluronan degradation and decolorization of ABTS methods). the results show decrease the hydrogen donation behavior of chitosan after coupling with cinnamaldehyde, in the other hand, ABTS method show increase the electron donation activity of cinnamyl chitosan than the chitosan itself. © 2016 Tamer Mahmoud Abdelrazik et al. Source


Tamer T.M.,Advanced Technologies and New Materials Research Institute ATNMRI | Tamer T.M.,Slovak Academy of Sciences
Interdisciplinary Toxicology | Year: 2013

Synovial fluid is a viscous solution found in the cavities of synovial joints. The principal role of synovial fluid is to reduce friction between the articular cartilages of synovial joints during movement. The presence of high molar mass hyaluronan (HA) in this fluid gives it the required viscosity for its function as lubricant solution. Inflammation oxidation stress enhances normal degradation of hyaluronan causing several diseases related to joints. This review describes hyaluronan properties and distribution, applications and its function in synovial joints, with short review for using thiol compounds as antioxidants preventing HA degradations under inflammation conditions. Copyright © 2013 SETOX & IEPT, SASc. Source


Eldin M.S.M.,Advanced Technologies and New Materials Research Institute ATNMRI | Abu-Saied M.A.,Advanced Technologies and New Materials Research Institute ATNMRI | Elzatahry A.A.,Advanced Technologies and New Materials Research Institute ATNMRI | El-Khatib K.M.,National Research Center of Egypt | And 2 more authors.
International Journal of Electrochemical Science | Year: 2011

Novel acid-base poly vinyl chloride -doped ortho-phosphoric acid membranes for prospective fuel cells (DMFC) applications were prepared for the first time. Base polymers were prepared first through amination using ethylene daimine (EDA). The base aminated PVC membranes were consequently doped with ortho-phosphoric acid (OPA). The later are significantly contributed to enhance ion exchange capacity (IEC) and thermal stability. Changes of chemical structure were verified through FT-IR, and TGA characterization. As a result, the thickness and the water uptake of acid-base prepared membranes were increased with increase of doped OPA concentration comparing with original PVC membrane. Maximum water uptake of 105(%) and 3.41 (meq/g) IEC were obtained. This makes the prepared acid-base PVC-doped OPA membranes promising and attractive new materials in fuel cells applications. © 2011 by ESG. Source


Abu-Saied M.A.,Advanced Technologies and New Materials Research Institute ATNMRI | Abu-Saied M.A.,King Saud University | Elzatahry A.A.,Advanced Technologies and New Materials Research Institute ATNMRI | Elzatahry A.A.,King Saud University | And 6 more authors.
Journal of Applied Polymer Science | Year: 2012

This work concerns preparation of acid-base polyelectrolyte membranes for fuel-cell applications from cellulosic backbones for the first time. Grafted cellophane-phosphoric acid-doped membranes for direct oxidation methanol fuel cells (DMFC) were prepared following three steps. The first two steps were conducted to have the basic polymers. The first step was introducing of epoxy groups to its chemical structure through grafting process with poly(glycidylmethacrylate) (PGMA). The second step was converting the introduced epoxy groups to imides groups followed by phosphoric acid (-PO 3H) doping as the last step. This step significantly contributes to induce ion exchange capacity (IEC) and ionic conductivity (IC). Chemical changes of the cellophane composition and morphology characters were followed using FTIR, TGA, and SEM analysis. Different factors affecting the membranes characters especially IEC, methanol permeability, and thermal stability were investigated and optimized to have the best preparation conditions. Compared to Nafion 117 membrane, cellophane-modified membranes show a better IEC, less methanol permeability, and better mechanical and thermal stability. IEC in the range of 1-2.3 meq/g compared to 0.9 meq/g per Nafion was obtained, and methanol permeability has been reduced by one-order magnitude. However, the maximum obtained IC for cellophane-PGMA-grafted membrane doped with phosphoric acid was found 2.33 × 10 -3 (S cm -1) compared to 3.88 × 10 -2 (S cm -1) for Nafion 117. The obtained results are very promising for conducting further investigations taking into consideration the very low price of cellophane compared to Nafion. © 2011 Wiley Periodicals, Inc. Source

Discover hidden collaborations