Publications

Amphiphilic antidepressant drug amitriptyline hydrochloride under the influence of ionic and nonionic hydrotropes; micellization and phase separation

Direkter Zugang zu Azulenen über eine Gold‐katalysierte Dimerisierung von Diarylalkinen

Abstract Eine einfache Gold‐katalysierte Methode für die Synthese von substituierten und modifizierbaren Azulenen wurde entwickelt. Die Azulene werden entweder über die Dimerisierung von Push‐Pull‐Diarylalkinen mit Fluor‐Substituenten in ortho ‐ oder para ‐Position, oder über die Dimerisierung eines symmetrischen elektronenreichen Diarylalkins gebildet. In Anwesenheit eines kationischen Gold‐Katalysators bilden die zwei Alkine ein hoch reaktives Vinyl‐Kation. Diese energiereiche Zwischenstufe wird durch eine passende Aryl‐Einheit abgefangen, sodass liefert in einem einzigen, perfekt atomökonomischen Schritt substituierte Azulene erhalten werden.

Investigation of micellar and phase separation phenomenon of phenothiazine drug promazine hydrochloride with anionic hydrotropes

Nanocomposite based functionalized Polyethersulfone and conjugated ternary ZnYCdO nanomaterials for the fabrication of selective Cd2+ sensor probe

Synthesis, structural analysis, electrochemical and antimicrobial activities of copper magnesium zirconosilicate (Cu20Mg10Si40Zr(30-x)O:(x = 0,5,7,10) Ni2+) nanocrystals

Synergistic Antimicrobial Effect of Egyptian Honey with Antibiotics and Its Capability to Restore MRSA Sensitive to Oxacillin

Since some types of honey interact synergistically at sub-lethal (sub MIC) concentrations with antibiotics, the work tested this activity of six Egyptian honey brands; three of potent (fennel, 2 of anise & black seed) as well as three of fair antimicrobial activity (multi-floral) against two G-ve and two G+ve multi drug resistant bacterial strains [E. coli AUMC B-243, Klebsiella pneumonia AUMC B-257 and Strept. agalactiae AUMC B-253 and methicillin resistant Staphylococcus aureus (MRSA)] using agar dilution method. The four bacterial strains had high resistance index (RI) ranging (0.18 – 0.73). All tested honey brands had different potencies of antimicrobial activity against all bacterial strains with MICs values (6-15 %), where the best overall MIC was with the use of anise & black seed II (8.5 %) followed by fennel (9.5 %). Either of potent or fair antimicrobial honey brands showed synergistic action with different antimicrobial agents against MRSA with synergistic index (SI) ranged from 0.17 up to 0.39, where the best overall SI of each honey brand against the tested antimicrobial agents was with the use of anise & black seed I (0.39) followed by fennel (0.37). None of the tested honey types showed bactericidal action and all had bacteriostatic activity but the interesting wonderful observation as that all tested Egyptian honey brands (either with of potent or fair activity) restored MRSA (methicillin resistant Staphylococcus aureus) sensitive to Oxacillin being MESSA (methicillin sensitive Staphylococcus aureus). The study concluded that all six tested honey either of potent or fair antimicrobial activity honey brands had variable synergistic activity with antibiotics against MRSA and restored it sensitive to Oxacillin. Keywords: Egyptian honey, antimicrobial, MRSA, synergism

ChemInform Abstract: Metal—Organic Frameworks as Catalysts for Oxidation Reactions

Abstract Review: 78 refs.

Interconnected urchin-like cobalt phosphide microspheres film for highly efficient electrochemical hydrogen evolution in both acidic and basic media

Interconnected urchin-like cobalt phosphide microspheres film on Ti foil (u-CoP/Ti) shows high activity for hydrogen evolution electrocatalysis in acidic and basic media.

Recent Advancements in High-Performance Solid Electrolytes for Li-ion Batteries: Towards a Solid Future

With the emergence of non-conventional energy resources and development of energy storage devices, serious efforts on lithium (Li) based rechargeable solid electrolyte batteries (Li- SEBs) are attaining momentum due to their potential as a safe candidate to replace state-of-the-art conventionally existing flammable organic liquid electrolyte-based Li-ion batteries (LIBs). However, Li-ion conduction in solid electrolytes (SEs) has been one of the major bottlenecks in large scale commercialization of next-generation Li-SEBs. Here, in this review, various challenges in the realization of high-performance Li-SEBs are discussed and recent strategies employed for the development of efficient SEs are reviewed. In addition, special focus is laid on the ionic conductivity enhancement techniques for inorganic (including ceramics, glasses, and glass-ceramics) and polymersbased SEs. The development of novel fabrication routes with controlled parameters and highperformance temperature optimized SEs with stable electrolyte-electrode interfaces are proposed to realize highly efficient Li-SEBs.

Enhanced photocatalytic activity and ultra-sensitive benzaldehyde sensing performance of a SnO₂·ZnO·TiO₂ nanomaterial

The synthesis of a ternary SnO₂·ZnO·TiO₂ nanomaterial (NM) by a simple co-precipitation method and its potential applications as an efficient photocatalyst and chemical sensor have been reported. The synthesized nanomaterial was fully characterized by XRD, SEM, EDS, XPS, FTIR, AFM and photoluminescence studies. This nanomaterial exhibited enhanced efficiency in photo-catalysis of Methyl Violet 6b (MV) dye degradation. The observed photocatalyst efficiency of the SnO₂·ZnO·TiO₂ nanomaterial was 100% under UV light at pH 9. Moreover, it lost around 12% efficiency over five reuses. The PL properties with changing excitation energy were also reported. Glassy carbon electrode (GCE) was modified with the SnO₂·ZnO·TiO₂ nanomaterial by an efficient electrochemical technique to develop a chemical sensor for selective benzaldehyde. Hazardous benzaldehyde was carefully chosen as a target analyte by a selectivity study; it displays a rapid response towards the SnO₂·ZnO·TiO₂/Nafion/GCE sensor probe in electrochemical sensing. It also shows superb sensitivity, an ultra-low detection limit, long-term stability, and very good repeatability and reproducibility. In this study, a linear calibration plot was obtained for 0.1 nM to 1.0 mM aqueous benzaldehyde solutions, with a sensitivity value of 4.35 nA μM^-1 cm^-2 and an exceptionally low detection limit (LOD) of 3.2 ± 0.1 pM (S/N = 3). Hence, a chemical sensor modified with SnO₂·ZnO·TiO₂/GCE may be a promising sensor in the determination of toxic chemicals in the environmental and healthcare fields.

The phase separation, interaction forces and thermodynamics of sodium alginate and TX-100 mixture in the manifestation of alcohols: UV–visible and cloud point measurement studies

Core-shell-shell nanocomposites structured polyaniline-rGO coated copolymer of NiFe2O4@poly(aniline-co-pyrrole) for sensitive Co2+ detection

CCDC 2114183: Experimental Crystal Structure Determination

Mixed micellization of gemini surfactant with nonionic surfactant in aqueous media: a fluorometric study

Herein we report on the study of the interactions between alkanediyl-α,ω-type cationic dimeric (gemini) surfactant and the nonionic Triton X-100 in aqueous medium. The critical micelle concentrations of binary mixtures were determined by fluorometric study. Using the regular solution theory for the analysis of the experimental data, the attractive nature of interactions and synergistic behavior of gemini surfactant and Triton X-100 mixture were demonstrated. The micelle aggregation number was measured using steady state fluorescence quenching method. The micropolarity, binding constant and dielectric constant of mixed systems were determined from the ratio of peak’s intensity (I 1/I 3) in the pyrene fluorescence emission spectrum.

Sulfonamide hybrid schiff bases of anthranilic acid: Synthesis, characterization and their biological potential

Orange Dye and Silicone Glue Composite Gel-Based Optimized Impedimetric and Capacitive Surface-Type Proximity Sensors

Optimized surface-type impedimetric and capacitive proximity sensors have been fabricated on paper substrates by using rubbing-in technology. The orange dye (OD) and silicone glue (SG) composite-gel films were deposited on the zig-zag gap between two aluminum electrodes fixed on a paper (dielectric) substrate. The effect of proximity of various objects (receivers) on the impedance and the capacitance of the sensors was investigated. These objects were semi-cylindrical aluminum (metallic) foil, a cylindrical plastic tube filled with water, a kopeck-shaped plastic tube filled with carbon nanotubes and a human finger. The mechanism of sensing was based on the change in impedance and/or the capacitance of the sensors with variation of proximity between the surfaces of the sensor and the object. On decreasing proximity, the impedance of the sensors increased while the capacitance decreased. The impedimetric proximity sensitivities of CNT, water, metal-based receivers and the finger were up to 60 × 10³ Ω/mm, 35 × 10³ Ω/mm, 44 × 10³ Ω/mm and 6.2 × 10³ Ω/mm, respectively, while their capacitive sensitivities were -19.0 × 10^-2 pF/mm, -16.0 × 10^-2 pF/mm, -16.4 × 10^-2 pF/mm and -1.8 × 10^-2 pF/mm. If needed for practical application, the sensors can be built in to the Wheatstone bridge, which can also increase the sensitivity of the measurement. Moreover, the sensor's materials are low cost, while the fabrication technique is easy and ecologically friendly. The sensor can also be used for demonstrative purposes in school and college laboratories.

Advanced Ceramics for Biomedical Applications

Bio ceramics are being prepared by advanced 3D printing technology which is a very good economical technique. Different inorganic materials can be used to print bio ceramics for different applications such as alumina, zirconia, Leucite, lithium disilicate and mica-based ceramics. The main implications of bio ceramics are in dentistry and orthopedics.

Development of selective Co2+ ionic sensor based on various derivatives of benzenesulfonohydrazide (BSH) compound: An electrochemical approach