A5022960518- MXene and MAX Phase Materials
- Advanced Photocatalysis Techniques
- 2D Materials and Applications
- Conducting polymers and applications
- TiO2 Photocatalysis and Solar Cells
- Advanced Thermoelectric Materials and Devices
- Quantum Dots Synthesis And Properties
- Layered Double Hydroxides Synthesis and Applications
- Radioactive element chemistry and processing
- Chemical Synthesis and Characterization
- Supercapacitor Materials and Fabrication
- Advanced Battery Materials and Technologies
- Mesoporous Materials and Catalysis
- Multiferroics and related materials
- Copper-based nanomaterials and applications
- Advancements in Battery Materials
- Aerogels and thermal insulation
- Thermal Radiation and Cooling Technologies
- Covalent Organic Framework Applications
- Boron and Carbon Nanomaterials Research
- Graphene research and applications
- Aluminum Alloys Composites Properties
- Gas Sensing Nanomaterials and Sensors
- Advanced battery technologies research
- Iron oxide chemistry and applications
Drexel University
2020-2025
Stanford University
2025
Materials Science & Engineering
2022-2023
Cairo University
2017-2022
American University in Cairo
2019
The first MXene discovered, Ti3C2Tz, was synthesized by etching aluminum, Al, from the nanolaminated MAX phase, Ti3AlC2, using hydrofluoric acid, HF. To delaminate resulting multilayers, MLs, it necessary to increase interlayer spacing, treating them with relatively large organic cations such as tetrabutylammonium hydroxide, TBAOH, dimethyl sulfoxide, DMSO, etc. When etched a combination of LiF and HCl on other hand, Li spontaneously intercalated no extra delamination step needed. Herein, we...
One-dimensional lepidocrocite, 1DL, titania, TiO2, is a recently discovered form of this ubiquitous oxide that interest in variety applications ranging from photocatalysis to water purification, among others. The fundamental building blocks these materials are snippets (30 nm long) individual 1DLs self-assemble into nanobundle, NB, structures. These NBs can then be driven quasi-two-dimensional, 2D, sheets, films, or free-flowing mesoscopic particles. Here, we use analytical atomic-resolution...
We recently demonstrated scalable, one-pot syntheses of one-dimensional, titania lepidocrocite microfilaments by reacting Ti-containing water-insoluble, earth-abundant compounds such as TiC, TiB2, TiN, etc., with tetraalkylammonium hydroxide, TMAOH, for a few days at 85 °C under ambient pressure. The resulting one-dimensional (1DL) titania-based nanofilaments, NFs, tend to self-align along the [100] growth direction form that sometimes into pseudo-two-dimensional (2D) sheets. With...
Metal oxide nanostructures have received an increasing attention owing to their unique chemical and physical properties along with widespread applications in various fields. This article provides overview of the recent discovery - christened Hydroxides-Derived Nanostructures, or HDNs which hydroxide aqueous solutions (mostly tetramethylammonium hydroxide, TMAH) are reacted at temperatures < 100 °C under atmospheric pressure metal-containing precursors scalably prepare novel metal...
The high theoretical energy density of metal-sulfur batteries compared to their lithium-ion counter parts renders sulfur-based electrode chemistries attractive. Additionally, sulfur is relatively abundant and environmentally benign. Yet, issues like the low conductivity sulfur, polysulfide (PS) formation, shuttling have hindered development chemistries. Here, we react titanium carbide powders with tetramethylammonium hydroxide ammonium salts at 50 °C for 5 days convert them into one...
Synthesizing high-performance, multifunctional composites often entails poor filler dispersion, complex processes, or limited processing conditions. Hence, the advent of versatile syntheses employing simple conditions, inexpensive fillers, standard equipment, and robust reactions could expand attainable having enhanced performance, functionality, customizability. We report on synthesis a novel elastomeric composite from new, reinforcing titania-based repairable, dynamic-covalent thiol-yne...
Highly crystalline two-dimensional (2D) flakes of birnessite, a polymorph manganese oxide with MnO2 chemistry, were synthesized by reacting oxide, Mn3O4, at 80 °C aqueous solutions tetramethylammonium hydroxide (TMAH) for tens hours. Their colloidal stability, aggregation, and sedimentation studied as function ionic strengths Na+ Li+ cations. After reaction, water-based stable suspension (ζ-potential ∼ −31 ± 1 mV) was obtained. Mixing the LiCl or NaCl solution resulted in crumpled flakes,...
Synchrotron‐based small‐ and wide‐angle X‐ray scattering is used to elucidate the structure of low‐dimensional lepidocrocite–titanate‐based nanofilaments. In colloidal state, they consist quantum‐confined 1D NFs, loosely associated into nanoribbons, one lepidocrocite sheet thick (about 4 Å), 30–40 Å wide (5–8 NFs), more than 300 long. dry reach a final state extended sheets, stacked three about twenty high, whose crystallinity increases with stack height, in parallel decrease photocatalytic...
The MAB phases are a family of layered ternary transition metal borides, with atomically laminated crystal structures comprised boride (M-B) layers interleaved by single, or double, Al (A) layers. Herein, density functional theory is implemented to evaluate the thermodynamic stability disordered (Mn1-xCrx)2AlB2, and ordered (Mn1-xCrx)3AlB4 quaternaries. (Mn1-xCrx)2AlB2 solid solutions were synthesized over entire range substitution. A solution was produced, on base Cr3AlB4, form...
Since the discovery of first MXene, Ti3C2Tz, in 2011, more than 30 new MXene chemistries have been reported. A universal method via which all MXenes can be synthesized is by etching "A" layer from MAX phase using hydrofluoric acid, HF. After etching, to delaminate resulting multilayers, MLs, they are typically treated with a surfactant like tetrabutylammonium hydroxide, TBAOH, tetramethylammonium TMAOH, dimethyl sulfoxide, DMSO, etc. In our earlier work, we found that treating HF-etched...
Removing actinide, and other heavy metal cations, from wastewater to render it potable is an active important area of research. Herein, using TiB2 as inexpensive green precursor, we synthesized 100 gram-scale hierarchical mesoporous particles (MPPs) composed ion-exchangeable one-dimensional lepidocrocite (1DL) titanate nanofilaments, NFs. These unique MPPs were deployed efficiently capture troublesome actinides wastewater. It was found that the 1DL-based exhibited considerable U(VI)...
The optimization of nonradiative recombination losses through interface engineering is key to the development efficient, stable, and hysteresis-free perovskite solar cells (PSCs). In this study, for first time in cell technology, we present a novel approach modification by employing one-dimensional lepidocrocite (henceforth referred as 1DL) TiO2-based nanofilaments, NFs, between mesoporous TiO2 (mp TiO2) halide film PSCs improve both efficiency stability devices. 1DLs can be easily produced...