I received several awards, including the Best Researcher award from Minia University, in the years from 2013 to 2023. He published more than 100 publications. He is a member of many national and international associations and has reviewed many international publications in many journals. I am studying polymer electrolyte membranes for fuel cells as bulk and thin films using many techniques such as positron annihilation lifetime, slow positron beam, single and coincidence Doppler broadened of annihilation radiation, WAXD, XPS, proton conductivity, contact angle, FTIR, and so on. I am also studying the layer double hydroxide (LDH) for water purification and using the LDH waste as catalysts for fuel cell applications. He is a professional in experimental nuclear physics (coincidence spectrometers, Gamma, Beta, and Alpha Spectrometers).
RESEARCH, TEACHING, or OTHER INTERESTS
Nuclear and High Energy Physics, Renewable Energy, Sustainability and the Environment, Water Science and Technology, Polymers and Plastics
104
Scopus Publications
2332
Scholar Citations
29
Scholar h-index
63
Scholar i10-index
Scopus Publications
Effect of ilmenite and barite addition on gamma rays attenuation of cement pastes: study of the pore structure by positron annihilation technique Mai M. Al-Khattab, M. A. Abdelzaher, T. M. El-Desouky, M. Abdel Geleel, F. M. Ragab, Mostafa I. Qassim, Hamdy F. M. Mohamed, M. A. Tantawy Journal of Infrastructure Preservation and Resilience, 2026 Designing cementitious composites that both withstand mechanical loads and provide effective γ-ray shielding requires understanding how high-density mineral fillers alter hydration, pore structure, and radiation attenuation—knowledge that is currently fragmented for ilmenite and barite additions. This study therefore systematically evaluates Type I OPC pastes containing 5–15 wt% ilmenite or barite (with sodium lignosulfonate at 0–0.3 wt% as a water-reducing admixture). Cubic specimens were water-cured to 28 days and characterized by compressive strength and bulk density measurements, X-ray diffraction (XRD), FTIR, thermogravimetry (TG), and scanning electron microscopy (SEM) for phase and microstructure, positron annihilation lifetime spectroscopy (PALS) (interpreted via the Tao–Eldrup model) for nanoscale pore sizing, and γ-ray attenuation tests (mass and linear attenuation coefficients, and half-value layers) across relevant energies. Increasing filler content raised chemically bound water but reduced bulk density and compressive strength; ilmenite-bearing composites consistently retained higher density and strength than equivalent barite mixes. XRD/FTIR/TG/SEM show ilmenite (poorly crystalline) supplies Fe²⁺/Fe³⁺/Ti⁴⁺ that substitute into ettringite/monosulfate and suppress their formation, whereas crystalline barite (Ba²⁺) promotes hydration phase development. Lignosulfonate altered water demand and setting times (accelerating up to 0.2% then retarding) and influenced ettringite and C–S–H morphology. SEM indicated 10% barite densifies the matrix and reduces microporosity (but higher barite reverses this), while ilmenite improves packing at 20% yet coarsens pores at 30%. PALS revealed distinct nanoscale signatures: control OPC τ₃ ≈ 2.9 ns (R ≈ 0.2–0.3 nm), I₃ ≈ 0.95; barite at 15% τ₃ ≈ 2.1–2.5 ns (R ≈ 0.35 nm) with I₃ ≈ 1.35 (many small accessible pores); ilmenite at 15% produced larger nanopores (R ≈ 0.57 nm) and reduced I₃ ≈ 0.80 (fewer accessible sites). γ-attenuation tests show neat OPC is relatively better against low-energy photons; both fillers increase porosity and generally lower mass attenuation coefficients, but ilmenite exhibits a modest improvement in attenuation with increasing loading. Barite and ilmenite impart clearly different microstructural and functional trade-offs: barite can be used to engineer a dense network of small pores (beneficial for certain durability profiles), while ilmenite produces coarser voids that preserve mechanical performance and can selectively enhance γ-ray attenuation. These findings provide a basis for tailoring radiation-attenuating cementitious composites to balance shielding efficacy, porosity, and mechanical durability. Barite addition enhances the rate of hydration than ilmenite whereas ilmenite addition retains higher strength than barite at the same loading. Fe²⁺/Fe³⁺/Ti⁴⁺ leached from ilmenite substitute for Al³⁺ in ettringite/monosulfate, reducing their formation, whereas Ba²⁺ from barite promotes those phases. PALS proves that barite filler produces small pores while ilmenite produces large pores. Ilmenite additions slightly boost attenuation coefficient with increasing content, making it marginally more beneficial than barite.
Pore structure of ethyl cellulose (EC)/graphene oxide (GO) composite film investigated by electrochemical impedance spectroscopy Hejie Shen, Xiaomin Dian, Zisheng Feng, Zhe Chen, Geming Wang, Ping Fu, Zhidong Lin, Lei Yao, Hamdy F. M. Mohamed Canadian Journal of Chemical Engineering, 2026 Ethyl cellulose (EC) is one of the important coating materials for the short‐term protection of precious metals and jewellery. In this study, graphene oxide (GO) was introduced in EC films, and electrochemical impedance spectroscopy (EIS) was utilized to probe the ion permeation through the films. EIS results demonstrate the film resistance increased with the GO content from 0 to 1 wt.%, and decreased with the GO content from 1 to 4 wt.%. It indicates that the ion penetration first becomes difficult and then easier with the increase in GO content. SEM results reveal that the pore sizes of the doped EC composite films first decrease and then increase with the increase of GO content. Additionally, water contact angle results indicate that introducing GO enhanced the surface hydrophilicity of the EC composite film. The tensile test shows that the EC/GO composite film achieves the best mechanic property at the GO content of 1 wt.%. These findings indicate that the pore structure of EC could be adjust by GO platelet, which could be an easy method to modify the ion barrier through EC film.
Effect of Different γ-Irradiation Dose Rates on Hole Structure and Conductivity of NBR/PVC/Gamma 600 Composite Hamdy F. M. Mohamed, Howayda G. Taha, Mohamed H. M. Hassanien, I. T. Zedan Polymers for Advanced Technologies, 2026 In this paper, unvulcanized nitrile butadiene rubber (NBR)/polyvinyl chloride (PVC) mixtures were composed of Gamma 600 (72.6 wt%) as a filler to prepare NBR/ PVC/Gamma 600 composite. The samples were examined as a function of γ‐irradiation dose up to 300 kGy with different irradiation dose rates (0.5 and 1.0 kGy/h). The crystalline structure of all samples was examined using wide angle X‐ray diffraction. The swelling coefficients Q were calculated for the solvents (toluene, benzene, and chloroform), and inverse correlations between the diffusion coefficients and the irradiation doses for all the composites were observed. Calculations have been made to determine the conductivity and dielectric characteristics of the investigated composites. Improved charge carrier mobility was indicated by the frequency‐dependent behavior of the dielectric constant. Depending on the mixtures and irradiation dose, it was discovered that the conduction mechanism in the composite was investigated with correlated barrier hopping mechanism. Moreover, positron annihilation lifetime (PAL) spectroscopy showed that the free volume size shrinks with increasing γ‐irradiation for the samples irradiated with low or high irradiation dose rates. This shrinking is more pronounced for the 0.5 kGy/h γ‐irradiation dose rate samples. The crosslinking brought on by γ‐irradiation causes the free volume in the mixtures to diminish. Furthermore, there is a correlation between the macroscopic characteristics of the composites and the nanoscopic properties obtained via PAL spectroscopy.
Sustainable wastewater treatment by banana peel/layered double hydroxide composite under ideal conditions using the Taguchi method Hamdy F. M. Mohamed, Sarah H. M. Hafez, E. E. Abdel-Hady, M. O. Abdel-Hamed Scientific Reports, 2026 The present study investigates the removal of the cationic dye crystal violet (CV) from aqueous solutions using low-cost adsorbents derived from agricultural waste. Banana peels (BP) were activated, and a Ni–Ca–Fe layered double hydroxide (LDH) as well as a BP/LDH composite were synthesized and applied as adsorbents. The Taguchi experimental design was employed to optimize the adsorption process parameters, including pH, adsorbent dose, contact time, and initial dye concentration. Among the studied factors, pH, adsorbent dose, and initial concentration exhibited the most significant influence on CV removal efficiency. Under optimal conditions (pH 9, adsorbent dosage 0.1 g/L, and contact time 120 min), removal efficiencies of 66.0, 82.4, and 95.2% were achieved for BP, LDH, and BP/LDH, respectively. Analysis of variance (ANOVA) revealed that pH was the most influential parameter for CV adsorption onto BP and BP/LDH, whereas contact time played the dominant role for LDH. Equilibrium data were well described by the Freundlich, Langmuir, and Temkin isotherm models, with maximum adsorption capacities of 39.16, 81.10, and 187.40 mg/g for BP, LDH, and BP/LDH, respectively. Kinetic studies showed that the adsorption process followed the pseudo-second-order model, indicating chemisorption as the dominant mechanism. Reusability tests demonstrated that the BP/LDH composite retained a high removal efficiency of 80.0% after four adsorption – desorption cycles. These findings confirm that the BP/LDH composite is an efficient, sustainable, and reusable adsorbent with strong potential for practical wastewater treatment applications.
Insights into γ-irradiation effect on hole structure and conductivity of doped ethylene–propylene–diene rubber with different wheat husk fibers lengths Hamdy F. M. Mohamed, Howayda G. Taha, Islam T. Zedan, Esam E. Abdel-Hady, Mohamed H. M. Hassanien, Hossam B. Alaa Scientific Reports, 2025 In this paper, three samples of ethylene–propylene–diene monomer rubber (EPDM)/wheat husk fibers (WHF) with short (SW30), medium (EW30), and long (HW30) lengths of WHF were investigated as a function of γ-irradiation dose up to 300 kGy. The swelling coefficient Q of the toluene, benzene, and chloroform solvents was performed, and the Q reflects the ability of the polymer composites to absorb and retain a solvent within their structure. The conductivity of the examined composites has been computed, and their dielectric characteristics have been calculated. It was found that the dielectric constant exhibited frequency-dependent behavior indicating enhanced charge carrier mobility. The conduction mechanisms in the composites were found to be quantum mechanical tunneling and correlated barrier hopping, depending on the composite and irradiation dose. The γ-irradiation dose dependence of the free volume size, deduced from positron annihilation lifetime spectroscopy, is increasing for the SW30 composite while it decreases for both EW30 and HW30 composites. Increasing the free volume hole size is connected to the degradation effect on the SW30 samples. For EW30 and HW30, there is shrinkage of free volume in the composites due to crosslinking induced by γ-irradiation. Additionally, the nanoscopic properties derived from PAL spectroscopy are correlated with the macroscopic properties of the composites.
Nanofibres for medical and healthcare applications Isra H. Ali, Hany Abd El-Raheem, Ahmed F.A. Youssef, Ahmed Farghali, Sarah H.M. Hafez, Amal Zaher, Hamdy F.M. Mohamed, E.E. Abdel-Hady, Maha B. Abd Elhaleem, Rehab Mahmoud Technical Organic and Inorganic Fibres from Natural Resources, 2024
Positron annihilation in cardo-based polymer membranes Y. Kobayashi, Shingo Kazama, K. Inoue, T. Toyama, Y. Nagai, K. Haraya, Hamdy F. M. Mohamed, B. E. O’Rouke, N. Oshima, A. Kinomura, R. Suzuki Journal of Physical Chemistry B, 2014
Effect of Electron Beam Irradiation on Microstructure and Performance of Polyamide/Polysulfone Composite Membranes for Water Treatment H Shen, Z Zhang, F Wang, Z Chen, L Yao, J Liu, L Qian, Z Chen, ... Journal of Environmental Chemical Engineering, 123038 , 2026 2026
Sustainable wastewater treatment by banana peel/layered double hydroxide composite under ideal conditions using the Taguchi method HFM Mohamed, SHM Hafez, EE Abdel-Hady, MO Abdel-Hamed Scientific Reports 16 (1), 7188 , 2026 2026
Study of mechanical and electrical properties through positron annihilation spectroscopy for different thickness of NBR/PVC/Gamma 600 blend HFM Mohamed, HG Taha, IT Zedan, YS Elsharkawy, MRM Elsharkawy Applied Radiation and Isotopes, 112457 , 2026 2026
Effect of Different γ-Irradiation Dose Rates on Hole Structure and Conductivity of NBR/PVC/Gamma 600 Composite HFM Mohamed, HG Taha, MHM Hassanien, IT Zedan Polymers for Advanced Technologies 37 (1), e70513 , 2026 2026
Effect of ilmenite and barite addition on gamma rays attenuation of cement pastes: study of the pore structure by positron annihilation technique MM Al-Khattab, MA Abdelzaher, TM El-Desouky, M Abdel Geleel, ... Journal of Infrastructure Preservation and Resilience 7, 3 , 2026 2026 Citations: 1
Pore structure of ethyl cellulose (EC)/graphene oxide (GO) composite film investigated by electrochemical impedance spectroscopy H Shen, X Dian, Z Feng, Z Chen, G Wang, P Fu, Z Lin, L Yao, ... The Canadian Journal of Chemical Engineering 104, 1153-1161 , 2026 2026
Structural, mechanical, and radiation attenuation properties of CdO-Al2O3-PbO-Bi2O3 glass ceramics: Insights from XRD, FTIR, and Positron Annihilation Spectroscopy YB Saddeek, HFM Mohamed, KA Aly, MA Albedah, MA Rafea Radiation Physics and Chemistry, 113212 , 2026 2026 Citations: 7
Impact of heat treatment on the structural, positron annihilation parameters, electrical, and electrochemical properties of Tin oxide/tin pyrophosphate nanocomposites NK Wally, E Sheha, HFM Mohamed, I Morad, KF Qasim, MM El-Desoky Journal of Alloys and Compounds 1040, 183399 , 2025 2025 Citations: 8
Effect of irradiation on ethylene propylene diene monomer doped with different concentrations of wheat husk fiber HFM Mohamed, HG Taha, EE Abdel-Hady, MHM Hassanien, ... Radiation Physics and Chemistry 229, 112529 , 2025 2025 Citations: 6
Insights into γ-irradiation effect on hole structure and conductivity of doped ethylene–propylene–diene rubber with different wheat husk fibers lengths HFM Mohamed, HG Taha, IT Zedan, EE Abdel-Hady, MHM Hassanien, ... Scientific Reports 15 (1), 10225 , 2025 2025 Citations: 3
Nanofibers for Medical and Healthcare Applications MBAERM Isra H. Ali, Hany Abd El-Raheem, Ahmed F.A. Youssef, Ahmed Farghali ... TECHNICAL ORGANIC AND INORGANIC FIBRES FROM NATURAL RESOURCES, 313 , 2025 2025
Investigation of the impact of an electric field on polymer electrolyte membranes for fuel cell applications HFM Mohamed, EE Abdel-Hady, MHM Hassanien, WM Mohammed Physics 6 (4), 1345-1365 , 2024 2024 Citations: 6
Relationship between structural, electrical properties and positron annihilation parameters of V2O5–Cu2O–P2O5 glasses WM Mohammed, MM El-Desoky, N Abdllah, HFM Mohamed, ... Physica B: Condensed Matter 694, 416459 , 2024 2024 Citations: 8
Study of mechanical and electrical properties through positron annihilation spectroscopy for ethylene-propylene-diene rubber biocomposites with treated wheat husk fibers HFM Mohamed, HG Taha, WM Mohammed, EE Abdel-Hady, S Awad Scientific Reports 14 (1), 24302 , 2024 2024 Citations: 10
Characterization and application of LDH with chitosan composites investigated by positron annihilation lifetime spectroscopy and surface texture for the adsorption of methyl orange EE Abdel-Hady, SHM Hafez, HFM Mohamed, MRM Elsharkawy Scientific Reports 14 (1), 16501 , 2024 2024 Citations: 28
Positron annihilation techniques as probes for investigation of the polymer electrolyte membranes with different ion exchange capacities HFM Mohamed Journal of the Egyptian Society for Basic Sciences-Physics 1 (2), 66-82 , 2024 2024 Citations: 1
Handbook of nanosensors: materials and technological applications GAM Ali, KF Chong, ASH Makhlouf Springer Nature , 2024 2024 Citations: 26
Annealing effects on the structural, positron annihilation parameters, and electrical properties of Fe 2 O 3 - PbO 2 -TeO 2 glasses MM El-Desoky, EE Abdel-Hady, HFM Mohamed, MHM Hassanien, ... Physica Scripta 99 (3), 035934 , 2024 2024 Citations: 6
Effect of plasma pretreatment and graphene oxide ratios on the transport properties of PVA/PVP membranes for fuel cells MO Abdel-Hamed, AA Draz, M Khalaf, FM El-Hossary, HFM Mohamed, ... Scientific Reports 14 (1), 1092 , 2024 2024 Citations: 21
Nanomaterials for electrochemical sensing of heavy metals in wastewater streams YG 1. Rehab Mahmoud, E. E. Abdel-Hady, Hamdy F. M. Mohamed, Mohamed Ibrahim ... Handbook of Nanosensors: Materials and Technological Applications, 1219 , 2024 2024
MOST CITED SCHOLAR PUBLICATIONS
Crosslinked PVA/SSA proton exchange membranes: Correlation between physiochemical properties and free volume determined by positron annihilation spectroscopy MM Gomaa, C Hugenschmidt, M Dickmann, EE Abdel-Hady, ... Physical Chemistry Chemical Physics 20 (44), 28287-28299 , 2018 2018 Citations: 208
Free volume and permeabilities of O2 and H2 in Nafion membranes for polymer electrolyte fuel cells HFM Mohamed, K Ito, Y Kobayashi, N Takimoto, Y Takeoka, A Ohira Polymer 49 (13-14), 3091-3097 , 2008 2008 Citations: 158
Textural properties and adsorption behavior of Zn–Mg–Al layered double hydroxide upon crystal violet dye removal as a low cost, effective, and recyclable adsorbent EE Abdel-Hady, HFM Mohamed, SHM Hafez, AMM Fahmy, A Magdy, ... Scientific Reports 13 (1), 6435 , 2023 2023 Citations: 93
Dust accumulation on photovoltaic panels: a case study at the East Bank of the Nile (Beni-Suef, Egypt) K Menoufi, HFM Mohamed, AA Farghali, MH Khedr Energy Procedia 128, 24-31 , 2017 2017 Citations: 78
Hierarchical ternary ZnCoFe layered double hydroxide as efficient adsorbent and catalyst for methanol electrooxidation EE Abdel-Hady, R Mahmoud, SHM Hafez, HFM Mohamed Journal of Materials Research and Technology 17, 1922-1941 , 2022 2022 Citations: 76
Effects of ion exchange on the free volume and oxygen permeation in Nafion for fuel cells HFM Mohamed, Y Kobayashi, CS Kuroda, A Ohira The Journal of Physical Chemistry B 113 (8), 2247-2252 , 2009 2009 Citations: 67
Effect of interface on surface morphology and proton conduction of polymer electrolyte thin films A Ohira, S Kuroda, HFM Mohamed, B Tavernier Physical Chemistry Chemical Physics 15 (27), 11494-11500 , 2013 2013 Citations: 64
Study of the TiO2 effect on the heavy metals oxides borosilicate glasses structure using gamma-ray spectroscopy and positron annihilation technique KSS T. Alharbi, Hamdy F.M. Mohamed, Yasser B. Saddeek, Ahmed Y. El-Haseib Radiation Physics and Chemistry 164, 108345 , 2019 2019 Citations: 57
Physical and electrochemical properties of PVA/TiO2 nanocomposite membrane EE Abdel‐Hady, HFM Mohamed, MO Abdel‐Hamed, MM Gomaa Advances in Polymer Technology 37 (8), 3842-3853 , 2018 2018 Citations: 54
Possible presence of hydrophilic SO3H nanoclusters on the surface of dry ultrathin Nafion® films: a positron annihilation study HFM Mohamed, S Kuroda, Y Kobayashi, N Oshima, R Suzuki, A Ohira Physical Chemistry Chemical Physics 15 (5), 1518-1525 , 2013 2013 Citations: 54
Nanomaterials-modified disposable electrodes and portable electrochemical systems for heavy metals detection in wastewater streams: A review Y GadelHak, SHM Hafez, HFM Mohamed, EE Abdel-Hady, R Mahmoud Microchemical Journal 193, 109043 , 2023 2023 Citations: 52
Positronium formation in aromatic polymer electrolytes for fuel cells Y Kobayashi, HFM Mohamed, A Ohira The Journal of Physical Chemistry B 113 (17), 5698-5701 , 2009 2009 Citations: 47
Vacancy-type defects in cold-worked iron studied using positron annihilation techniques HFM Mohamed, J Kwon, YM Kim, W Kim Nuclear Instruments and Methods in Physics Research Section B: Beam … , 2007 2007 Citations: 44
Characterization and evaluation of Nafion HP JP as proton exchange membrane: transport properties, nanostructure, morphology, and cell performance EEAH Michael S. A. Kamel, Hamdy F. M. Mohamed, M. O. Abdel-Hamed Journal of Solid State Electrochemistry 23, 2639–2656 , 2019 2019 Citations: 34
Comparative catalytic efficacy of cost-effective MIL-101 (Cr) based PET waste for biodiesel production AS Abou-Elyazed, AKF Shaban, AI Osman, LA Heikal, HFM Mohamed, ... Current Research in Green and Sustainable Chemistry 8, 100401 , 2024 2024 Citations: 33
Change of distribution of free volume holes during crystallization of poly (ethylene terephthalate) revealed by positron annihilation lifetime spectroscopy HFM Mohamed, Y Ito, M Imai The Journal of chemical physics 105 (11), 4841-4845 , 1996 1996 Citations: 33
Free volume, oxygen permeability, and uniaxial compression storage modulus of hydrated biphenol-based sulfonated poly (arylene ether sulfone) HFM Mohamed, Y Kobayashi, CS Kuroda, N Takimoto, A Ohira Journal of Membrane Science 360 (1-2), 84-89 , 2010 2010 Citations: 32
Temperature dependence of the free volume in polytetrafluoroethylene studied by positron annihilation spectroscopy HFM Mohamed, EE Abdel-Hady, SS Mohamed Radiation Physics and Chemistry 76 (2), 160-164 , 2007 2007 Citations: 32
Investigations of Positronium Formation and Destruction Using 3γ/2γ Annihilation-Ratio Measurements WE Kauppila, EG Miller, HFM Mohamed, K Pipinos, TS Stein, ... Physical review letters 93 (11), 113401 , 2004 2004 Citations: 32
Non‐fluorinated PVA/SSA proton exchange membrane studied by positron annihilation technique for fuel cell application S Awad, EE Abdel‐Hady, HFM Mohamed, YS Elsharkawy, MM Gomaa Polymers for Advanced Technologies 32, 3322-3332 , 2021 2021 Citations: 31