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د.مهدي محمد المهدي عبدالمجيد

Ph.D in Experimental Physics (Liquid crystals) أستاذ مشارك 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.

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