sameh rizk
@asu.edu.eg
Prof. Organic Chemistry, chemistry, faculty of science
Ain Shams University
RESEARCH, TEACHING, or OTHER INTERESTS
Organic Chemistry, Environmental Chemistry
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Mohamed N. M. Ismail, Nehal A. Barghout, Sameh A. Rizk, and Ahmed El Nemr
Springer Science and Business Media LLC
Mohammed A. Kadhim, Mohammed G. Mukhlif, Estabraq W. Gayadh, Emad K． M. Zangana, Majid A. Mohaisen, Muthanna M. Matar, and Sameh Ahmed Rizk
Elsevier BV
Mona A. Shalaby, Mohammad H. BinSabt, Hamad M. Al-Matar, Sameh A. Rizk, and Asmaa M. Fahim
Elsevier BV
Belal M. Kanaan, Ayman M. Algohary, Zahra H. Alhalafi, Sameh A. Rizk, and Atef S. Darwish
Elsevier BV
M. Ahmed Mubarak, Reem Mohamed, Sameh Ahmed Rizk, Atef Samir Darwish, Osama Abuzalat, and Mohamed Eid M. Ali
Elsevier BV
M. H. Alhalafi, S. A. Rizk, E. S. Al-Malki, and A. M. Algohary
Springer Science and Business Media LLC
AbstractIn this work, a beneficial approach for efficient depolymerization of lignin and controllable product distribution is provided. Lignin, an abundant aromatic biopolymer, has the potential to produce various biofuels and chemical adsorption agents and is expected to benefit the future circular economy. Microwave-ultrasonic (MW/US) assisted efficient depolymerization of lignin affords some aromatic materials used in manufacturing the starting material to be investigated. Some nano organometallic surfactants (NOMS) based on Ni2+, Cu2+, Co2+, Fe3+, and Mn2+ besides 2-hydroxynaphth-sulphanilamide are synthesized to enhance oil recovery (EOR). In this work, the assessment of the NOMS’s efficiency was improving the heavy oil recovery via the study of the dynamic interfacial tension (IFT), contact angle, and chemical flooding scenarios. The NOMS-Ni2+ exhibited the maximum reduction of viscosity and yield values. Dropping the viscosity to 819.9, 659.89, and 499.9 Pa s from blank crude oil viscosity of 9978.8, 8005.6, and 5008.6 Pa s respectively at temperatures of 40, 60, and 80 °C was investigated. The reduction of τB values was obtained also by OMS-Ni2+. The minimum IFT was recorded against the Ni2+ derivatives (0.1 × 10–1 mN m−1). The complete wettability alteration was achieved with the NOMS-Ni2+ surfactant (ɵ $$\\cong 6.01).$$ ≅ 6.01 ) . The flooding test has been steered in 3 sets using the sand-packed model as a porous media at surfactant concentrations (1, 1.5, 2 and 2.5%) at 50 °C and 499 psi as injection pressure. The best value (ORs) formed for NOMS-Ni2+ were 62, 81, 85.2, and 89% respectively as compared with other NOMS-M2+ at the same concentrations. The mechanism of alternating wettability was described in the text. The rheology of the used heavy crude oil was investigated under temperatures of 40, 60, and 80 °C. Graphical Abstract
Abdel-Nasser et al.
Egyptian Knowledge Bank
Fatma E.A. Bayaumy, Sameh A. Rizk, and Atef S. Darwish
Elsevier BV
Mahmoud Adel Hamza, Shaimaa A. Abd El-Rahman, Sayed K. Ramadan, Ezz-Elregal M. Ezz-Elregal, Sameh A. Rizk, and Zeinab M. Abou-Gamra
Elsevier BV
B. M. Alotaibi, Haifa A. Alyousef, A. Atta, S. A. Rizk, and Abdelfattah T. Elgendy
The Electrochemical Society
Novel composite (MC/TiO2) films consisting of titanium dioxide nanoparticles (TiO2NPs) and organic polymer methylcellulose (MC), were synthesized for applied in photocatalysis and industrial sectors. The preparation of the nanocomposites MC/TiO2 films were verified successfully by EDX technique, which demonstrated the uniform distribution of TiO2 in the MC. Moreover, in frequency of 20 Hz to 5.5 MHz, the dielectric properties of MC as a function of TiO2 concentration were determined. The conductivity improved from 5.8 × 10−8 S.cm−1 for MC to 3.8 × 10−6 S.cm−1 for the composite MC/TiO2, and the dielectric constant ε ′ has risen from 87 for MC to 179 for the composite MC/TiO2. In addition, the energy density increases from 3.86 × 10−4 J m−3 for MC to 7.94 × 10−4 J m−3 for MC/TiO2, and the relaxation time τ r dropped from 11.5 × 10−5 sec to 2.58 × 10−5. In summary, the data investigated that the dielectric characteristics of MC/TiO2 were modified for usage in different applications as wastewater treatment and energy storage devices.
Mona A. Shalaby, Mohammad H. BinSabt, Sameh A. Rizk, and Asmaa M. Fahim
Royal Society of Chemistry (RSC)
In this study, (2-propoxyphenyl)(3-(p-tolyl)oxiran-2-yl)methanone was synthesised by oxidizing the double bond of the respective chalcone via the Weitz–Scheffer epoxidation reaction. The insecticidal activities of the newly synthesized compounds were tested with computional investigation.
B. M. Alotaibi, , H. A. Al-Yousef, A. Atta, S. A. Rizk, A. T. Elgendy, , , , and
Virtual Company of Physics
In this work, a thin film containing a flexible polymer nanocomposite of iron oxide (Fe2O3) and poly(4-chloroaniline) P(4-ClAni) was successfully synthesized using the green polymerization fabrication method. To confirm the effective synthesis of the P(4- ClAni)/Fe2O3 nanocomposite, the XRD, SEM, and FTIR analyses were used. The SEM pictures revealed that the nanocomposite contain Fe2O3 nanoparticles distributed throughout the polymer matrix. The optical absorbance of the P(4-ClAni) and P(4-ClAni)/Fe2O3 films was measured at room temperature using a UV-vis spectrophotometer from 190 to 1150 nm. The optical properties of P(4-ClAni)/Fe2O3 films were calculated using Tauc's relation. The Urbach energy of the P(4-ClAni) increases from 0.96 eV to 1.65 eV, 1.73 eV, and 1.86 eV, respectively, when mixed with 2%, 4%, and 6% of Fe2O3. On the other hand, the band gap energy of P(4-ClAni) decreases from 3.57 eV to 3.39 eV, 3.07 eV, and 2.84 eV, respectively, with the addition of 2%, 4%, and 6% Fe2O3. Based on the results of this study, the composite P(4-ClAni)/Fe2O3 sheets can be used for flexible electronic devices.
Badriah M. Alotaibi, Haifa A. Al-Yousef, Ali Atta, Sameh A. Rizk, and Abdelfattah T. Elgendy
Emerald
In this study, polyvinyl alcohol (PVA) and sodium iodide (NaI) were mixed to prepare flexible composite (PVA/NaI) films using the green solution casting synthesis method. Subsequently, these films were exposed to different times of nitrogen plasma (15, 30, 45, and 60 min) using cold plasma source. The X-ray diffraction and scanning electron microscope analysis were utilized to reveal effects of nitrogen beam on the structural and morphology of the treated samples, respectively. Furthermore, the UV–vis spectroscopic measurements were utilized to study the optical parameters of the pristine and exposed films. Other parameters were computed, such as refractive index and dielectric constant. The plasma resonance frequency (WP) modified from 0.3 × 1013 Hz for the PVA/NaI to 0.41 × 1013, 0.34 × 1013, 0.31 × 1013, and 0.23 × 1013 Hz after irradiation of 15, 30, 45, and 60 min of nitrogen plasma, respectively. The most important aspect of this research is the optimization of composite characteristics and plasma conditions to create materials with novel properties for usage in different optical devices. The results show that the irradiated films PVA/NaI are appropriate for use as optical materials for flexible optoelectronic devices.
Ayman M. Algohary, Youssef O. Al-Ghamdi, Manal A. Babaker, and Sameh A. Rizk
Informa UK Limited
Sayed K. Ramadan, Sameh A. Rizk, and Eman A.E. El-Helw
Bentham Science Publishers Ltd.
Abstract: This survey provides information on the synthesis and biological applications of coumarinyl-chalcones. Chalcones are unsaturated ketones involving the reactive ketoethylenic group (CO-CH=CH). Chalcones are naturally abundant in many medical plants, including vegetables, fruits, and foods. Natural and synthetic chalcone compounds exhibit a broad spectrum of biological properties like anticancer, anti-inflammatory, anti-HIV, antioxidant, antimalarial, and antimicrobial. Some conventional, microwave, and grinding techniques have been utilized for the synthesis of chalcones. Noteworthy, the Claisen- Schmidt condensation reaction remains the most popular and effective method for synthesis. It summarizes information about its synthetic methods as building blocks in some reactions like cyclization reactions and medical applications. This review article presents an overview of approaches and biological data for chalcones bearing a coumarin scaffold.
Abd El-Azeem El-Sheikh, Ahmed Barakat, Omar Rabiee, Sameh Rizk, Ahmed Kandeil, and Ahmed El Taweel
Egypts Presidential Specialized Council for Education and Scientific Research
.
Badriah Alotaibi, Sameh A. Rizk, Haifa A. Alyousef, Ali Atta, and Abdelfattah T. Elgendy
Wiley
Facile synthesis for true intermediate (E)‐ and Z‐2‐(((5‐bromo‐1‐(3‐chloropyridin‐2‐yl)‐1H‐pyrazol‐3‐yl)methylene)amino)‐5‐chloro‐3‐methylbenzoic acid precursors and 2‐(5‐bromo‐1‐(3‐chloropyridin‐2‐yl)‐1H‐pyrazol‐3‐yl)‐6‐chloro‐3,8‐dimethylquinazolin‐4(3H)‐one (QPP) as electron donor/electron acceptor to be working as efficient dye sensitizers. These new derivatives have a wide‐band gap photo‐catalysts semiconductor and are performing to spread to the visible‐light region to give more stability and efficiency towards biomedicine for different diseases. In the present work, the authors are suggesting the design and synthesis of new structures of QPP molecule with extended visible light absorptivity due to the extended π‐π/n‐π conjugations, to stimulate TiO2 nanoparticles in visible‐light region. The physicochemical characterizations confirmed the successful synthesis of QPP, TiO2, and QPP II/TiO2 samples with the proposed structures. Fixing of QPP on the TiO2 surface is refining the optical properties of TiO2 with enhancing the charge separation and generating the efficient antenna in the visible region. Furthermore, the QPP II/TiO2 sample achieved a threefold enhancement in the observed rate constant of the photo‐degradation of rhodamine B dye when compared to the bare TiO2. Finally, the effect of the scavengers was investigated by to be the most reactive species, and the mechanism of the enhancement was suggested for investigation of the proposed structures in various photo‐catalytic and biomedical applications.
Sameh A. Rizk, Abdullah Y. Alzahrani, and Abdullah M. Abdo
Informa UK Limited
Amira A. El-Sayed, Galal A. Elsayed, Sameh A. Rizk, and Mahmoud F. Ismail
Informa UK Limited
Maha Elshazly, Hayam Mahmoud, Amal Saad, Laila Refahy, Mosad Ghareeb, and SAMEH RIZK
Egypts Presidential Specialized Council for Education and Scientific Research
Mahmoud Adel Hamza, Sameh A. Rizk, Ezz-Elregal M. Ezz-Elregal, Shaimaa A. Abd El-Rahman, Sayed K. Ramadan, and Zeinab M. Abou‑Gamra
Springer Science and Business Media LLC
AbstractWater pollution is one of the global threats severely affecting our planet and human health. Organic textile dyes are one of the common organic water pollutants that are presentient to degradation by traditional physical methods. Semiconductor-assisted photocatalysis is considered a green, efficient, and sustainable technology for wastewater treatment. To maximize the efficient utilization of solar radiation, it is of pivotal significance to explore novel organic molecules to be employed as efficient dye sensitizers for wide-bandgap semiconductors to extend their performance to the Visible-light region. Hence, in this work, we are proposing the design and synthesis of novel structures of QAD molecule as a dye photosensitizer with extended visible light absorptivity due to the extended π–π/n–π conjugations, to promote the performance of TiO2 nanoparticles to the visible-light region and enhance the charge separation. The physicochemical characterizations confirmed the successful synthesis of QAD, TiO2, and QAD/TiO2 samples with the proposed structures. The anchoring of QAD molecules on the surface of TiO2 caused a substantial improvement in the optical characteristics of TiO2 as well as overcoming its common drawbacks by decreasing its bandgap energy to 2.6 eV, a remarkable reduction of PL intensity indicating reducing the e–h recombination and enhancing the charge separation, and creation of efficient visible light-harvesting antenna in the range of 400–600 nm. Besides, the QAD/TiO2 sample achieved a 3-fold enhancement in the observed rate constant of the photodegradation of Rhodamine B dye compared to the bare TiO2. The parameters affecting the photodegradation process were optimized and the sample displayed outstanding stability after 4 consecutive cycles. Finally, the effect of the scavengers was investigated and $${\\mathrm{O}}_{2}^{\\cdot -}$$ O 2 · - was proposed to be the most reactive species and the mechanism of the enhancement was suggested based on the electron injection from the QAD’s HOMO level to the TiO2’s CB. Finally, this work opens the door for various studies for the investigation of the proposed structures or similar structures in various photocatalytic/biomedical applications.
Mona A. Shalaby, Asmaa M. Fahim, and Sameh A. Rizk
Springer Science and Business Media LLC
AbstractIn this investigation, pressure microwave irradiation was used to clarify the activity of 1-(2-hydroxyphenyl)-3-(4-methylphenyl)prop-2-en-1-one (3) towards several active methylene derivatives utilized the pressurized microwave irradiation as green energy resource . Chalcone 3 was allowed to react with ethyl cyanoacetate, acetylacetone, and thioglycolic acid; respectively, at 70 °C with pressure under microwave reaction condition to afford the corresponding 2-hydroxyphenylcyanopyridone, 2-hydroxyphenyl acetylcyclohexanone, and thieno[2,3-c]chromen-4-one derivatives respectively. Moreover, the reaction of chalcone 3 with hydrogen peroxide with stirring affords the corresponding chromen-4-one derivative. All the synthesized compounds were confirmed through spectral tools such as FT-IR, 1HNMR, 13CNMR, and mass spectrum. Furthermore, the synthesized heterocycles were exhibited excellent antioxidant activity and comparable with vitamin C, where the presence of the OH group increases the scavenger radical inhibition. Furthermore, the biological activity of compound 12 was demonstrated through molecular docking stimulation using two proteins, PDBID: 1DH2 and PDBID: 3RP8, which showed that compound 12 possesses greater binding energy and a shorter bond length comparable with ascorbic acid. Also, the compounds were optimized through DFT/B3LYP/6-31G (d,p) basis set and identification of their physical descriptors, whereas the compound 12 was confirmed through X-Ray single structure with Hirsh field analysis of the compound to know the hydrogen electrostatic bond interaction, and correlated with the optimized structure by comparing their bond length, bond angle, FT-IR, and NMR, which gave excellent correlation.
Ashraf Ashmawy, amr Alahl, Ali A.Ali, Ammar Mahmoud, and sameh rizk
Egypts Presidential Specialized Council for Education and Scientific Research
Mona A. Shalaby, Sameh A. Rizk, and Asmaa M. Fahim
Royal Society of Chemistry (RSC)
Chalcones, Reactions, Synthesis, Biological activity, Industrial application.