ORCID Profile
0000-0003-1852-6687
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Publisher: Wiley
Date: 07-11-2021
Abstract: Liquid–liquid interfaces of liquid alloys with electrolytic solutions present fertile platforms for realizing exciting interfacial phenomena that can be devised to process alloys and produce nanomaterials. Here, such an interface is established by immersing a gallium–bismuth binary liquid alloy into aqueous electrolytes. It is shown that the application of a negative voltage to this interface results in a rapid and complete liberation of bismuth nanostructures from liquid gallium. The set of conditions that govern the chemistry of the interface can be adjusted to control the oxidation state, morphology, and crystal structure of the expelled bismuth. By changing the conditions nanotubular, atomically thin plates, and sea‐urchin‐shaped bismuth oxide morphologies are obtained. The process can also control the crystal phase of bismuth oxide as monoclinic (α), tetragonal (β), or body‐centered cubic (γ). The addition of ascorbic acid to the electrolyte is observed to prevent the oxidation of the expelled entities, resulting in bismuth metal nanoparticles. Ab initio molecular dynamics and computational fluid dynamics simulations are performed to elucidate this rapid phase separation at the interface. This knowledge will potentially lead to new pathways for using alloys as reaction media to refine metals while simultaneously producing nanomaterials for various applications.
Publisher: Elsevier BV
Date: 03-2017
DOI: 10.1016/J.JENVMAN.2016.11.079
Abstract: Environmental concern about automotive shredder residue (ASR) has increased in recent years due to its harmful content of heavy metals. Although several approaches of ASR management have been suggested, these approaches remain commercially unproven. This study presents an alternative approach for ASR management where advanced materials can be generated as a by-product. In this approach, titanium nitride (TiN) has been thermally synthesized by nitriding pressed mixture of automotive shredder residue (ASR) and titanium oxide (TiO
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TC01973F
Abstract: Post-transition metal-based liquid alloys are emerging as media for undertaking chemical reactions.
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 11-2017
DOI: 10.1016/J.WASMAN.2017.08.020
Abstract: This study reports on the novel and sustainable synthesis of high value carbon nanoparticles (CNPs) from waste tyre rubber (WTR), using an innovative high temperature approach. As waste tyres are composed, primarily, of carbon - accounting for some 81.2wt% - they represent a promising source of carbon for many potential applications. However, cost-effective options for their processing are limited and, consequently, billions of waste tyres have accumulated in landfills and stockpiles, posing a serious global environmental threat. The rapid, high temperature transformation of low value WTR to produce valuable CNPs, reported here, addresses this challenge. In this study, the transformation of WTRs was carried out at 1550°C over different reaction times (5s to 20min). The structure and morphology of the resulting CNPs were investigated using X-ray diffraction (XRD), Raman spectroscopy, X-ray photon spectroscopy (XPS), N
Publisher: Wiley
Date: 04-07-2019
Publisher: Elsevier BV
Date: 07-2017
Publisher: American Chemical Society (ACS)
Date: 10-06-2021
Publisher: American Chemical Society (ACS)
Date: 11-09-2020
Publisher: Elsevier BV
Date: 04-2016
DOI: 10.1016/J.WASMAN.2016.02.003
Abstract: Large increasing production volumes of automotive shredder residue (ASR) and its hazardous content have raised concerns worldwide. ASR has a desirable calorific value, making its pyrolysis a possible, environmentally friendly and economically viable solution. The present work focuses on the pyrolysis of ASR at temperatures between 950 and 1550°C. Despite the high temperatures, the energy consumption can be minimized as the decomposition of ASR can be completed within a short time. In this study, the composition of ASR was investigated. ASR was found to contain about 3% Ti and plastics of high calorific value such as polypropylene, polyethylene, polycarbonate and polyurethane. Based on thermogravimetric analysis (TGA) of ASR, the non-isothermal degradation kinetic parameters were determined using Coats-Redfern's and Freeman and Carroll methods. The evolved gas analysis indicated that the CH4 was consumed by the reduction of some oxides in ASR. The reduction reactions and the presence of Ti, silicates, C and N in ASR at 1550°C favor the formation of specific ceramics such as TiN and SiC. The presence of nano-ceramics along with a highly-crystalline graphitic carbon in the pyrolysis residues obtained at 1550°C was confirmed by scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and Raman imaging microscope (RIM) analyses.
Publisher: Elsevier BV
Date: 09-2019
Publisher: Wiley
Date: 08-06-2020
Publisher: American Chemical Society (ACS)
Date: 16-11-2021
Abstract: Liquid metals (LMs) are electronic liquid with enigmatic interfacial chemistry and physics. These features make them promising materials for driving chemical reactions on their surfaces for designing nanoarchitectonic systems. Herein, we showed the interfacial interaction between eutectic gallium-indium (EGaIn) liquid metal and graphene oxide (GO) for the reduction of both substrate-based and free-standing GO. NanoIR surface mapping indicated the successful removal of carbonyl groups. Based on the gained knowledge, a composite consisting of assembled reduced GO sheets on LM microdroplets (LM-rGO) was developed. The LM enforced Ga
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2TB02079C
Abstract: A liquid gallium–polydopamine composite was synthesised and utilised as a soft biocompatible electrode for cell culture by electro-stimulation increasing the proliferation rate of model animal fibroblasts.
Publisher: American Chemical Society (ACS)
Date: 30-08-2021
Publisher: Elsevier BV
Date: 2021
Publisher: Wiley
Date: 11-12-2021
Publisher: Elsevier BV
Date: 02-2019
Publisher: American Chemical Society (ACS)
Date: 06-10-2021
Publisher: Wiley
Date: 29-09-2020
Abstract: Colloidal liquid metal alloys of gallium, with melting points below room temperature, are potential candidates for creating electrically conductive and flexible composites. However, inclusion of liquid metal micro- and nanodroplets into soft polymeric matrices requires a harsh auxiliary mechanical pressing to rupture the droplets to establish continuous pathways for high electrical conductivity. However, such a destructive strategy reduces the integrity of the composites. Here, this problem is solved by incorporating small loading of nonfunctionalized graphene flakes into the composites. The flakes introduce cavities that are filled with liquid metal after only relatively mild press-rolling ( 30 kPa. The composites are used for forming flexible electrically-conductive tracks in electronic circuits with a self-healing property. The demonstrated application of co-fillers, together with liquid metal droplets, can be used for establishing electrically-conductive printable-composite tracks for future large-area flexible electronics.
Publisher: Elsevier BV
Date: 08-2021
Publisher: American Chemical Society (ACS)
Date: 16-02-2019
Publisher: American Association for the Advancement of Science (AAAS)
Date: 09-12-2022
Abstract: In nature, snowflake ice crystals arrange themselves into erse symmetrical six-sided structures. We show an analogy of this when zinc (Zn) dissolves and crystallizes in liquid gallium (Ga). The low-melting-temperature Ga is used as a “metallic solvent” to synthesize a range of flake-like Zn crystals. We extract these metallic crystals from the liquid metal solvent by reducing its surface tension using a combination of electrocapillary modulation and vacuum filtration. The liquid metal–grown crystals feature high morphological ersity and persistent symmetry. The concept is expanded to other single and binary metal solutes and Ga-based solvents, with the growth mechanisms elucidated through ab initio simulation of interfacial stability. This strategy offers general routes for creating highly crystalline, shape-controlled metallic or multimetallic fine structures from liquid metal solvents.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7CE01634D
Abstract: Planar-dependent oxygen vacancy concentrations in photocatalytic CeO 2 nanoparticles.
Publisher: American Chemical Society (ACS)
Date: 19-12-2020
Abstract: Phonon-polaritons (PhPs) in layered crystals, including hexagonal boron nitride (hBN), have been investigated by combined scattering-type scanning near-field optical microscopy (s-SNOM) and Fourier transform infrared (FTIR) spectroscopy. Nevertheless, many of such s-SNOM-based FTIR spectra features remain unexplored, especially those originated from the impact of boundaries. Here we observe real-space PhP propagations in thin-layer hBN sheets either supported or suspended by s-SNOM imaging. Then with a high-power broadband IR laser source, we identify two major peaks and multiple auxiliary peaks in the near-field litude spectra, obtained using scattering-type near-field FTIR spectroscopy, from both supported and suspended hBN. The major PhP propagation interference peak moves toward the major in-plane phonon peak when the IR illumination moves away from the hBN edge. Specific differences between the auxiliary peaks in the near-field litude spectra from supported and suspended hBN sheets are investigated regarding different boundary conditions, associated with edges and substrate interfaces. The outcomes may be explored in heterostructures for advanced nanophotonic applications.
Publisher: Wiley
Date: 12-09-2021
Abstract: The introduction of trace impurities within the doping processes of semiconductors is still a technological challenge for the electronics industries. By taking advantage of the selective enrichment of liquid metal interfaces, and harvesting the doped metal oxide semiconductor layers, the complexity of the process can be mitigated and a high degree of control over the outcomes can be achieved. Here, a mechanism of natural filtering for the preparation of doped 2D semiconducting sheets based on the different migration tendencies of metallic elements in the bulk competing for enriching the interfaces is proposed. As a model, liquid metal alloys with different weight ratios of Sn and Bi in the bulk are employed for harvesting Bi 2 O 3 ‐doped SnO nanosheets. In this model, Sn shows a much stronger tendency than Bi to occupy surface sites of the Bi–Sn alloys, even at the very high concentrations of Bi in the bulk. This provides the opportunity for creating SnO 2D sheets with tightly controlled Bi 2 O 3 dopants. By way of ex le, it is demonstrated how such nanosheets could be made selective to both reducing and oxidizing environmental gases. The process demonstrated here offers significant opportunities for future synthesis and fabrication processes in the electronics industries.
Publisher: American Chemical Society (ACS)
Date: 30-04-2021
Publisher: Elsevier BV
Date: 08-2017
Publisher: Wiley
Date: 03-2023
Abstract: The lack of understanding for precise synthesis and assembly of nano‐entities remains a major challenge for nanofabrication. Electrocrystallization of a charge‐transfer complex (CTC), tetrathiafulvalene bromide (TTF)Br, is studied on micro/nanoelectrodes for precision deposition of functional materials. The study reveals new insights into the entire CTC electrocrystallization process from the initial nanocluster nucleation to the final elongated crystals with hollow ends grown from the working electrode to the neighboring receiving electrode. On microelectrodes, the number of nucleation sites is reduced to one by lowering the applied overpotential or precursor concentration. Certain current–time transients exhibit significant induction periods prior to stable nucleus growth. The induction regime contains small fluctuating current spikes consistent with stochastic formation of precritical nanoclusters with lifetimes of 0.1–30 s and sizes of 20–160 nm. Electrochemical analyses further reveal rate, size distribution, and formation/dissipation dynamics of the nanoclusters. Crystal growth of (TTF)Br is further studied on triangular nanoelectrode patterns with thickness of 5–500 nm, which shows a mass‐transfer‐controlled process applicable for precision deposition of functional (TTF)Br crystals. This study, for the first time, establishes CTC nanoelectrochemistry as a platform technology for precise deposition of conductive crystal assemblies spanning the source and drain electrode for sensing applications.
Publisher: Elsevier BV
Date: 03-2021
Publisher: American Chemical Society (ACS)
Date: 08-04-2020
Publisher: American Chemical Society (ACS)
Date: 22-02-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TC01466D
Abstract: Direct patterning of liquid metals via photolithography.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TC04302H
Abstract: This work presents the room temperature nitridation of gallium-based liquid metal alloy particles during sonication.
Publisher: American Chemical Society (ACS)
Date: 11-2021
Publisher: American Chemical Society (ACS)
Date: 12-05-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA02664J
Abstract: Post-transition metal composites were fabricated and used for the sensing of alkali metal ions towards the recovery of Li + from mixed salt aqueous solutions.
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 06-2019
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 10-2018
Publisher: Springer Science and Business Media LLC
Date: 18-01-2021
DOI: 10.1038/S41565-020-00835-7
Abstract: It is well-understood that during the liquid-to-solid phase transition of alloys, elements segregate in the bulk phase with the formation of microstructures. In contrast, we show here that in a Bi-Ga alloy system, highly ordered nanopatterns emerge preferentially at the alloy surfaces during solidification. We observed a variety of transition, hybrid and crystal-defect-like patterns, in addition to lamellar and rod-like structures. Combining experiments and molecular dynamics simulations, we investigated the influence of the superficial Bi and Ga
Publisher: Elsevier BV
Date: 10-2014
Publisher: American Chemical Society (ACS)
Date: 13-04-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4RA14513E
Abstract: A scalable and facile method was developed to synthesize nitrogen-doped porous carbon foams (NPCFs) using graphitic carbon nitride (g-C 3 N 4 ) nanosheets as hard templates through the calcination of mesophase pitch.
Publisher: Springer Science and Business Media LLC
Date: 23-06-2017
Publisher: American Chemical Society (ACS)
Date: 02-02-2018
Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 05-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7CE00922D
Abstract: Ceria (CeO 2 ) nanorods have been prepared by simple short-term precipitation at room temperature for the first time.
Publisher: American Chemical Society (ACS)
Date: 30-11-2022
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 05-2019
Publisher: Wiley
Date: 02-10-2021
Publisher: Informa UK Limited
Date: 22-01-2015
Publisher: American Chemical Society (ACS)
Date: 05-05-2020
Publisher: American Chemical Society (ACS)
Date: 19-05-2020
Publisher: Elsevier BV
Date: 06-2015
Publisher: Elsevier BV
Date: 03-2015
Publisher: Elsevier BV
Date: 11-2020
Publisher: Wiley
Date: 21-10-2022
Abstract: A green carbon capture and conversion technology offering scalability and economic viability for mitigating CO 2 emissions is reported. The technology uses suspensions of gallium liquid metal to reduce CO 2 into carbonaceous solid products and O 2 at near room temperature. The nonpolar nature of the liquid gallium interface allows the solid products to instantaneously exfoliate, hence keeping active sites accessible. The solid co‐contributor of silver–gallium rods ensures a cyclic sustainable process. The overall process relies on mechanical energy as the input, which drives nano‐dimensional triboelectrochemical reactions. When a gallium/silver fluoride mix at 7:1 mass ratio is employed to create the reaction material, 92% efficiency is obtained at a remarkably low input energy of 230 kWh (excluding the energy used for dissolving CO 2 ) for the capture and conversion of a tonne of CO 2 . This green technology presents an economical solution for CO 2 emissions.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9TC06883J
Abstract: Facile synthesis of a copper oxide–liquid metal composite.
Publisher: American Chemical Society (ACS)
Date: 16-08-2018
Publisher: American Chemical Society (ACS)
Date: 02-11-2022
Abstract: Liquid metals can be surface activated to generate a controlled galvanic potential by immersing them in aqueous solutions. This creates energized liquid-liquid interfaces that can promote interfacial chemical reactions. Here we utilize this interfacial phenomenon of liquid metals to deposit thin films of tin-doped tellurium onto rigid and flexible substrates. This is accomplished by exposing liquid metals to a precursor solution of Sn
Publisher: Elsevier BV
Date: 07-2016
Publisher: Elsevier BV
Date: 05-2018
No related grants have been discovered for mohannad mayyas.