Advanced Technology and New Materials and Research Institute ATNMRI

Alexandria, Egypt

Advanced Technology and New Materials and Research Institute ATNMRI

Alexandria, Egypt
SEARCH FILTERS
Time filter
Source Type

Abd Elhafez S.E.,Alexandria University | Abd Elhafez S.E.,Advanced Technology and New Materials and Research Institute ATNMRI | Abo-Zahhad E.M.,Alexandria University | Abo-Zahhad E.M.,Aswan University | And 3 more authors.
AIP Conference Proceedings | Year: 2017

In this investigation, the heat transfer characteristics of graphene nano platelets (GNPs)/water nanofluid were studied in a micro heat exchanger (MHE). The micro heat exchanger performance was also examined. The test setup was worked out in the laminar regime with Reynold numbers varying between 100 and 400GNPs/water nanofluid was prepared three different concentrations (0.025 wt. %, 0.05 wt. % and 0.1 wt. %) using ultrasonic wave. The influence of mass flow rate, inlet temperatures and weight fraction on the overall heat transfer coefficient (U) and logarithmic mean temperature (LMTD) were examined. The results showed considerable enhancement on the overall heat transfer coefficient of graphene/water nanofluid and the MHE effectiveness. A maximum enhancement on overall heat transfer coefficient was reached to 150% at Re=100 by 0.1wt% nanofluid. The effectiveness of micro heat exchanger was enhanced by increase weight fraction of graphene nanoparticle. Moreover, the experimental results showed that 0.1 wt. % GNPs/water nanofluid, flowing through MHE, has had high pressure drop, and pumping power, when it has been compared with 0.5 wt. % and 0.025 wt.%. © 2017 Author(s).


Abo-Zahhad E.M.,Alexandria University | Abo-Zahhad E.M.,Aswan University | El-Shazly A.H.,Alexandria University | Elkady M.F.,Alexandria University | Elkady M.F.,Advanced Technology and New Materials and Research Institute ATNMRI
AIP Conference Proceedings | Year: 2017

Co-precipitation method has been used for magnetic graphene nanocomposite (MGNCs) fabrication. Various characterization procedures have been used to compare the physical and chemical properties graphene nanoplatelets (GNPs)with the synthetic MGNCs. The crystal and chemical structures of GNPs before and after magnetic fixation have been identified using X-Ray diffraction and Fourier Transformed Infrared spectroscopy respectively. Morphology structure of magnetic composite has been indicated by using Transmission Electron Microscope (TEM). The Vibrating sample magnetometer (VSM) has confirmed the paramagnetic properties of the prepared composite that represented at its hysteresis curve. GNPs /water and MGNCs/water nanofluid have been prepared. The nanofluid performance of graphene magnetic composite has been compared with its corresponding graphene in microtubes at laminar flow region fully developed. The magnetic composite nanofluid has had slight pressure drop and pumping power decrement compared with its corresponding graphene nanofluid. This increment at the magnetic nanofluid may be further improved through the utilizing external magnetic field to control the fluid flow. © 2017 Author(s).


Elkady M.F.,Advanced Technology and New Materials Research Institute ATNMRI | Elkady M.F.,Alexandria University | Hassan H.S.,Advanced Technology and New Materials and Research Institute ATNMRI
Nanoscale Research Letters | Year: 2015

Zirconium tungesto-vanadate cation exchange material was successfully architectured at open ended nanotubes morphological structure in the presence of polyvinyl alcohol as a stabilizing agent using microwave route. The ion exchange capacity (IEC) of the material was recorded as 4.8 meq/g of about 640 m2/g for a specific surface area. The x-ray diffraction pattern of the material implies its crystallinity. Both scanning and transmission electron microscopes identified the average aspect ratio of the architectured nanotubes as 6.5 and its hollow structure. The material posed 96.4 % cadmium ion decontamination within 90 min compared with 84 % strontium decontamination at the same time. © 2015, Elkady and Hassan.


PubMed | Advanced Technology and New Materials Research Institute ATNMRI and Advanced Technology and New Materials and Research Institute ATNMRI
Type: Journal Article | Journal: Nanoscale research letters | Year: 2015

Zirconium tungesto-vanadate cation exchange material was successfully architectured at open ended nanotubes morphological structure in the presence of polyvinyl alcohol as a stabilizing agent using microwave route. The ion exchange capacity (IEC) of the material was recorded as 4.8meq/g of about 640m(2)/g for a specific surface area. The x-ray diffraction pattern of the material implies its crystallinity. Both scanning and transmission electron microscopes identified the average aspect ratio of the architectured nanotubes as 6.5 and its hollow structure. The material posed 96.4% cadmium ion decontamination within 90min compared with 84% strontium decontamination at the same time.


Elkady M.F.,Advanced Technology and New Materials and Research Institute ATNMRI | Farag S.,Genetic Engineering and Biotechnology Research Institute | Zaki S.,Genetic Engineering and Biotechnology Research Institute | Abu-Elreesh G.,Genetic Engineering and Biotechnology Research Institute | Abd-El-Haleem D.,Genetic Engineering and Biotechnology Research Institute
Bioresource Technology | Year: 2011

Bacillus mojavensis strain 32A that exhibited 96.11% flocculation efficiency for clay suspensions was selected from other 15 comparative strains. Under growth condition, strain 32A was able to produce 5.2g/L of purified biopolymer. Its constituent was mainly polysaccharide and protein with proportional of 98.4-1.6% respectively. FTIR spectrum was confirming its chemical analysis. This biopolymer attain very fast sedimentation rate. The cost-effective biopolymer and CaCl 2 dosages were 3mg/L and 5ml/L respectively that posed 89.7% flocculation efficiency. These dosages were suitable only for clay concentrations -5g/L. The maximum flocculation efficiency of the biopolymer recorded at pH 1.0 of clay suspension. The too high (>75°C) or too low (<25°C) clay suspension temperature was unfavorable for the biopolymer flocculation performance. The biopolymer solution utilized high thermal stability over the temperature range of 5-60°C. Furthermore, its pH stability recorded at pH range of 5-9. © 2011 Elsevier Ltd.


Abo-Zahhad E.M.,Alexandria University | Abo-Zahhad E.M.,Aswan University | El-Shazly A.H.,Alexandria University | El-Kady M.F.,Alexandria University | El-Kady M.F.,Advanced Technology and New Materials and Research Institute ATNMRI
Materials Science Forum | Year: 2016

Graphene Nano-plates (GNPs) was immobilized with Nano-magnetite using co-precipitation technique with the aid of ultrasound for the production of magnetic graphene nano plate composite Fe3O4/G (MGNC) production. The physico-chemical properties of graphene were compared with the fabricated magnetic graphene composite using different characterization techniques. The crystalline and chemical structures of nano-graphene before and after magnetic immobilization were identified using X-Ray diffraction. The morphological structure of magnetic composite was identified by using Transmission Electron Microscope (TEM). it was carried out to investigate the precipitation of nano-magnetite onto the Nano-graphene sheets. Atomic Force Microscope (AFM) analysis of magnetic graphene composites confirms the presence of magnetic Nano-particles attached to nano-graphene. The Vibrating sample magnetometer (VSM) confirmed the superparamagnetic properties of the prepared composite that represented with its hysteresis curve, and the saturation moment per unit mass, Ms for the MGNCs is 22. 7548 emu·g−1. © 2016 Trans Tech Publications, Switzerland.


PubMed | Advanced Technology and New Materials and Research Institute ATNMRI
Type: Journal Article | Journal: Bioresource technology | Year: 2011

Bacillus mojavensis strain 32A that exhibited 96.11% flocculation efficiency for clay suspensions was selected from other 15 comparative strains. Under growth condition, strain 32A was able to produce 5.2g/L of purified biopolymer. Its constituent was mainly polysaccharide and protein with proportional of 98.4-1.6% respectively. FTIR spectrum was confirming its chemical analysis. This biopolymer attain very fast sedimentation rate. The cost-effective biopolymer and CaCl(2) dosages were 3mg/L and 5 ml/L respectively that posed 89.7% flocculation efficiency. These dosages were suitable only for clay concentrations 5g/L. The maximum flocculation efficiency of the biopolymer recorded at pH 1.0 of clay suspension. The too high (>75C) or too low (<25C) clay suspension temperature was unfavorable for the biopolymer flocculation performance. The biopolymer solution utilized high thermal stability over the temperature range of 5-60C. Furthermore, its pH stability recorded at pH range of 5-9.

Loading Advanced Technology and New Materials and Research Institute ATNMRI collaborators
Loading Advanced Technology and New Materials and Research Institute ATNMRI collaborators