أعضاء هيئة التدريس | مواقع أعضاء هيئة التدريس

د.مهدي محمد المهدي عبدالمجيد

Ph.D in Experimental Physics (Liquid crystals) أستاذ مشارك قسم الفيزياء كلية العلوم والدراسات الانسانية بالخرج

الخرج
011-588-5888197
m.abdelmiged@psau.edu.sa

السيرة الذاتية
الأبحاث العلمية

المؤهلات العلمية

الاهتمامات البحثية

Research Interests
My research interests include:
 Broadband Dielectric Spectroscopy (as a function of temperature and pressure), X-ray scattering techniques, Differential Scanning Calorimetry (DSC), Polarizing Optical Microscopy (POM), and Atomic Force Microscopy (AFM) to study:
[1] Self-assembly and molecular dynamics of discotic and calamitic liquid crystals
[2] Structure and dynamics in polymer nanocomposites
[3] Local and global polymer dynamics in restricted geometries
[4] Self-assembly, phase state, molecular dynamics and kinetics of structure formation
[5] Structure and dynamics of block copolymers under 1D and 2D nanoconfinement
 Optical Tweezers to Study:
[1] Interaction Forces between microsized silica particles at varying pH, salt concentration, and valence
[2] Forces of interaction between poly(2-vinylpyridine) spherical brushes at varying pH, salt concentration, and valence
[3] Forces within single pairs of charged colloids in aqueous solutions of ionic liquids
[4] Sliding and sticking friction within single pairs of DNA-grafted colloids
[5] Micro-rheology on polymer-grafted colloids
 Scanning Force Microscopy (AFM colloidal probe technique) to study:
[1] The interaction forces between end-grafted polyelectrolyte brushes and colloidal particles with and without grafted brushes in situ in electrolyte solutions of varying pH, concentration, and valence
[2] The interaction forces between end-grafted mixed polyelectrolyte brushes and colloidal particles with and without grafted brushes in situ in electrolyte solutions of varying pH, concentration, and valence
[2] Besides the surrounding medium the chain length, grafting density, synthesis method of the brushes, and size of the colloidal particles are varied

الأبحاث العلمية

[1] M.M. Elmahdy, K.A. Aldhafeeri, M.T. Ahmed, M.A. Azzam, and T. Fahmy; Molecular dynamics and conduction mechanism of poly (vinyl chloride-co-vinyl acetate-co-2-hydroxypropyl acrylate) terpolymer containing ionic liquid. Submitted to Polymers for Advanced Technologies. Under review 2022.
[2] M.M. Elmahdy, M. T. Ahmed, K. A. Aldhafeeri, M. A. Azzam, and T. Fahmy; Thermal degradation and optical characteristics of plasticized poly (vinyl chloride-co-vinyl acetate-co-2-
hydroxypropyl acrylate) terpolymer. J. Mater. Sci.: Mater. Electron. 2022, 33, 23639-23658. (https://doi.org/10.1007/s10854-022-09124-6)
[3] M.M. Elmahdy, T. Fahmy, K.A. Aldhafeeri, E.O. Ibnouf and Y. Riadi; Optical and antibacterial properties of 1-butyl-3-methylimidazolium ionic liquids with trifluoromethanesulfonate or tetrafluoroborate anion. Materials Chemistry and Physics 2021, 264, 124369. (https://doi.org/10.1016/j.matchemphys.2021.124369)
[4] M.M. Elmahdy, D. Gournis, A. Ladavos, C. Spanos, and G. Floudas; H-shaped copolymer of polyethylene and poly(ethylene oxide) under severe confinement: Phase state and dynamics. Langmuir 2020, 36, 4261-4271. (https://doi.org/10.1021/acs.langmuir.0c00127)
[5] M.M. Elmahdy and A. El-Shaer; Structural, optical and dielectric investigations of electrodeposited p-type Cu2O. J. Mater. Sci.: Mater. Electron. 2019, 30, 19894-19905.
(Doi: 10.1007/s10854-019-02356-z)
[6] W.K. Kipnusu, M.M. Elmahdy, M. Elsayed, R. Krause-Rehberg and F. Kremer; The counterbalance between surface and confinement effects as studied for amino terminated poly(propylene glycol) constraint in silica nanopores. Macromolecules 2019, 52, 1864-1873. (Doi: 10.1021/acs.macromol.8b02687)
[7] A.A. Ali, M.M. Elmahdy, A. Sarhan, M.I. Abdel Hamid and M.T. Ahmed; Structure and dynamics of Polypyrrole/Chitosan Nanocomposites. Polymer International 2018, 67, 1615-1628. (https://doi.org/10.1002/pi.5685)
[8] A. Drechsler, M.M. Elmahdy, P. Uhlmann and M. Stamm; pH and Salt Response of Mixed Brushes Made of Oppositely Charged Polyelectrolytes Studied by in Situ AFM Force Measurements and Imaging. Langmuir 2018, 34, 4739-4749. (Doi: 10.1021/acs.langmuir.8b00498)
[9] M.M. Elmahdy, A. Drechsler, P. Uhlmann, and M. Stamm; Swelling and surface interactions of end-grafted poly(2-vinyl pyridine) layers in acidic solution: influence of grafting density and salt concentration. Langmuir 2016, 32, 5451-5459. (Doi: 10.1021/acs.langmuir.6b00316)
[10] W.K. Kipnusu, M.M. Elmahdy, E.U. Mapesa, J. Zhang, W. Böhlmann, D. M. Smilgies, C.M. Papadakis and F. Kremer; Structure and dynamics of asymmetric poly(styrene-b-1,4-isoprene) diblock copolymer under 1D and 2D nanoconfinement. ACS Applied Materials & Interfaces 2015, 7, 12328-12338. (Doi:10.1021/am506848s)
[11] M.M. Elmahdy, A. Drechsler, E. Bittrich, P. Uhlmann and M. Stamm; Interactions between silica particles and poly(2-vinylpyridine) brushes in aqueous solutions of monovalent and multivalent salts. Colloid and Polymer Science 2014, 292, 1999-2012. (Doi:10.1007/s00396-014-3291-z)
[12] W.K. Kipnusu, M.M. Elmahdy, M. Tress, M. Fuchs, E.U. Mapesa, D.M. Smilgies, J. Zhang, C.M. Papadakis, and F. Kremer; Molecular order and dynamics of nanometric thin layers of poly(styrene-b-1,4-isoprene) diblock copolymers. Macromolecules 2013, 46, 9729-9737. (Doi: 10.1021/ma4019334)
[13] M.M. Elmahdy, C.G. Clark Jr., H.-J. Butt, K. Müllen and G. Floudas; Dynamics and kinetics of structure formation in molecularly tethered fluorocarbon/hydrocarbon amphiphiles. J. Phys. Chem. B 2012, 116, 13812-13820. (Doi: 10.1021/jp309465z)
[14] C. Gutsche, M.M. Elmahdy, K. Kegler, I. Semenov, T. Stangner, O. Otto, O. Ueberschaer, U. F. Keyser, M. Krueger, M. Rauscher, R. Weeber, J. Harting, Y. W. Kim, V. Lobaskin, R. R. Netz and F. Kremer; Micro-rheology on (polymer-grafted) colloids using optical tweezers. J. Phys.: Condens. Matter 2011, 23, 184114-184131. (Doi:10.1088/0953-8984/23/18/184114)
[15] M.M. Elmahdy, C. Gutsche and F. Kremer; Forces within single pairs of charged colloids in aqueous solutions of ionic liquids as studied by optical tweezers. J. Phys. Chem. C 2010, 114, 19452-19458. (Doi: 10.1021/jp107673f)
[16] I.M. El-Sherbiny and M.M. Elmahdy; Preparation, characterization, structure, and dynamics of carboxymethyl chitosan grafted with acrylic acid sodium salt. Journal of Applied Polymer Science 2010, 118, 2134-2145. (Doi:10.1002/app.32517)
[17] A. Drechsler, A. Synytska, P. Uhlmann, M.M. Elmahdy, M. Stamm and F. Kremer; Interaction forces between microsized silica particles and weak polyelectrolyte brushes at varying pH and salt concentration. Langmuir 2010, 26, 6400-6410. (Doi: 10.1021/la904103z)
[18] M.M. Elmahdy, A. Synytska, A. Drechsler, C. Gutsche, P. Uhlmann, M. Stamm, and F. Kremer; Forces of interaction between poly(2-vinylpyridine) brushes as measured by optical tweezers. Macromolecules 2009, 42, 9096-9102. (Doi: 10.1021/ma901567d)
[19] M.M. Elmahdy, A. Drechsler, C. Gutsche, A. Synytska, P. Uhlmann, F. Kremer, and M. Stamm; Forces between blank surfaces as measured by the colloidal probe technique and by optical tweezers-A comparison. Langmuir 2009, 25, 12894-12898. (Doi: 10.1021/la901804a)
[20] M.M. Elmahdy, M. Mondeshki, X. Dou, H.J. Butt, H.W. Spiess, K. Müllen and G. Floudas; Slow kinetics of phase transformation in a dipole-functionalized discotic liquid crystal. J. Chem. Phys. 2009, 131, 114704-114712. (Doi: 10.1063/1.3225245)
[21] M.M. Elmahdy, X. Dou, M. Mondeshki, G. Floudas, H.J. Butt, H.W. Spiess and K. Müllen; Self-assembly, molecular dynamics and kinetics of structure formation in dipole functionalized discotic liquid crystals. J. Am. Chem. Soc. 2008, 130, 5311-5319. (Doi: 10.1021/ja7113618)
[22] M.M. Elmahdy, G. Floudas, M. Mondeshki, H.W. Spiess, X. Dou, and K. Müllen; Origin of the complex molecular dynamics in functionalized discotic liquid crystals. Phys. Rev. Lett. 2008, 100, 107801-107804. (Doi:10.1103/PhysRevLett.100.107801)
[23] M.M. Elmahdy, G. Floudas, M. Kastler and K. Müllen; Molecular dynamics of branched hexaalkyl hexa-peri-hexabenzocoronenes. J. Phys.: Condens. Matter 2008, 20, 244105-244110. (Doi:10.1088/0953-8984/20/24/244105)
[24] K. Chrissopoulou, A. Aftaris, S.H. Anastasiadis, M.M. Elmahdy, G. Floudas and B. Frick; Structure and dynamics in PEO nanocomposites. Eur. Phys. J. Special Topics 2007, 141, 267-271. (Doi: 10.1140/epjst/e2007-00051-9)
[25] M.M. Elmahdy, G. Floudas, L. Oldridge, A.C. Grimsdale and K. Müllen; Self-assembly and molecular dynamics of oligoindenofluorenes. Chem. Phys. Chem. 2006, 7, 1431-1441. (Doi: 10.1002/cphc.200600015)
[26] M.M. Elmahdy, K. Chrissopoulou, A. Aftaris, G. Floudas, and S.H. Anastasiadis; Effect of confinement on polymer segmental motion and ion mobility in PEO/layered-silicate nanocomposites. Macromolecules (Communication) 2006, 39, 5170-5173. (Doi: 10.1021/ma0608368)
[27] F.M. Reicha, A.M. Elabsy, A.A. Atta and M.M. Elmahdy; Structure of electropolymerized polyacrylonitrile. J. Polym. Matter 2004, 21, 445-454.

للاتصال من داخل الجامعة 1200
للاتصال من خارج الجامعة 011-588-1200
البريد الإلكترونى pr@psau.edu.sa
لطلب خدمة وفتح بلاغ للأعطال ithelp.psau.edu.sa

مواقع أعضاء هيئة التدريس

د.مهدي محمد المهدي عبدالمجيد

المؤهلات العلمية

الاهتمامات البحثية

الأبحاث العلمية

تواصل مع قيادات الجامعة

إدارة العلاقات العامة والإعلام

Social

مواقع أعضاء هيئة التدريس

د.مهدي محمد المهدي عبدالمجيد

المؤهلات العلمية

الاهتمامات البحثية

الأبحاث العلمية

إدارة العلاقات العامة والإعلام