57 results match your criteria: "National center for Physics[Affiliation]"

The misuse and uncontrolled release of pharmaceuticals into water bodies lead to environmental challenges and the development of resistance, thereby reducing their effectiveness. To mitigate these problems, it is essential to identify pharmaceuticals in water sources and eliminate them prior to human use. This study presents the designing of a novel nanosensor for the detection of the antibiotic Cefoperazone Sodium Sulbactam Sodium (CSSS).

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Water pollution, oxidative stress and the emergence of multidrug-resistant bacterial strains are significant global threats that require urgent attention to protect human health. Nanocomposites that combine multiple metal oxides with carbon-based materials have garnered significant attention due to their synergistic physicochemical properties and versatile applications in both environmental and biomedical fields. In this context, the present study was aimed at synthesizing a ternary metal-oxide nanocomposite consisting of silver oxide, copper oxide, and zinc oxide (ACZ-NC), along with a multi-walled carbon nanotubes modified ternary metal-oxide nanocomposite (MWCNTs@ACZ-NC).

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MXenes and MXene-Based Metal Hydrides for Solid-State Hydrogen Storage: A Review.

Chem Asian J

August 2024

Interdisciplinary Research Center for Hydrogen Technologies and Carbon Management, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia.

Article Synopsis
  • Hydrogen-driven energy is gaining attention for applications in transportation, but effective storage remains a significant challenge in achieving sustainability goals.
  • Solid-state hydrogen storage using nanomaterials, particularly MXenes, shows promise in enhancing the hydrogen storage capabilities of traditional metal hydrides like MgH and AlH, outperforming current technologies.
  • The review outlines advancements from 2019-2024, addressing the limitations of metal hydrides and presents a roadmap for future research focused on overcoming issues like reversibility and kinetics to improve hydrogen storage solutions.
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Incised marine valleys (IVS) are hot topics in exploring the stratigraphic oil and gas-bearing plays. Multiple channelized sandstone lenses at varying depths [m], thicknesses [m], and porosities [%] constrain seismic impedance. The presence of hydrocarbon-bearing resources affects the seismic impedance (density (g/cc) and velocity (m/s)).

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Copper selenide (CuSe) is an inorganic binary compound which exhibits metallic behavior with zero band gap. CuSe has multiple applications in electrocatalysis, photothermal therapy, flexible electronic and solar cells. In the current study, copper selenide based nanocomposites CuSe/PVP/GO and CuSe/MWCNTs were synthesized by using the sol-gel method for application as a non-enzymatic glucose biosensor.

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For many years, the synthesis of graphene oxide (GO) had involved exfoliating graphite flakes, and the methods applied were expensive and time-consuming. Thus, an attempt had been made to create an inventive, less expensive method for the synthesis of GO using unrefined, raw carbon-containing material. Modified Hummer's method was used to prepare GO from banana peel.

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Seismic attributes can play an important role in the exploration of hydrocarbon-bearing stratigraphic systems. Incised valley systems are developed during the falling sea, which causes the deposition of coarse-grained sandstone facies inside the low-standing tracts (LST). These regional phenomena constrain the quantitative attributes of ultra-thin-bedded stratigraphic petroleum traps, e.

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Growth and Characterization of Carbon Nanofibers Grown on Vertically Aligned InAs Nanowires via Chemical Vapour Deposition.

Nanomaterials (Basel)

December 2023

Istituto Officina dei Materiali-CNR, Laboratorio TASC Area Science Park-Basovizza, Edificio MM, Strada Statale 14, Km.163.5, I-34149 Trieste, Italy.

Article Synopsis
  • * A novel method for growing CNFs on vertically aligned indium arsenide (InAs) nanowires was developed using chemical vapor deposition (CVD) without altering the original structure of the nanowires.
  • * The research demonstrated that CNFs grow preferentially at the tops of the InAs nanowires, especially with iron as a catalyst, highlighting a tip growth mechanism that can improve the efficiency of hybrid structures.
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Room temperature bio-engineered multifunctional carbonates for CO sequestration and valorization.

Sci Rep

October 2023

UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, PO Box 392, Pretoria, South Africa.

This contribution reports, for the first time, on an entirely green bio-engineering approach for the biosynthesis of single phase crystalline 1-D nano-scaled calcite CaCO. This was validated using HO as the universal solvent and natural extract of Hyphaene thebaica fruit as an effective chelating agent. In this room temperature green process, CaCl and CO are used as the unique source of Ca and CO respectively in view of forming nano-scaled CaCO with a significant shape anisotropy and an elevated surface to volume ratio.

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The intricate problems concerning energy require innovative solutions. Herein, we propose a smart composite nano system that can be used in a sustainable and dichotomous manner to resolve energy crises. The current study describes a new way to synthesize a pure spinel cobalt oxide (CoO) and boron (B), nitrogen (N), and sulfur (S) tri-doped CoO-reduced graphite oxide (rGO) nanocomposite (CBNS).

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Non-enzymatic glucose biosensors show high sensitivity, lower response time, wide linear range and low cost. Copper based composites show excellent electrocatalytic tunability and lead to a better charge transfer in electrochemical non-enzymatic glucose biosensors. In this work, a nanocomposite of polyvinylpyrrolidone (PVP) and copper selenide was synthesized by a facile one pot sol gel method.

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Nickel stannate nanocomposites could be useful for removing organic and toxic water pollutants, such as methyl orange (MO). The synthesis of a nickel oxide-tin oxide nanocomposite (NiO-SnO NC) via a facile and economically viable approach using a leaf extract from for the photocatalytic degradation of MO. The phase composition, crystallinity, and purity were examined by X-ray diffraction (XRD).

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Article Synopsis
  • - The last decade has seen significant advancements in perovskite solar cells, but challenges remain with performance and stability issues related to commercialization.
  • - A new 2D material called MXene has emerged as a game-changer in enhancing solar energy conversion efficiency, offering high transparency, conductivity, and mechanical strength when used in perovskite solar cells.
  • - This review focuses on the integration of MXenes into perovskite cells, discussing their roles as additives and in charge extraction layers, while also addressing current limitations and future research opportunities for broader MXene applications.
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Nanotechnology is one of the vital and quickly developing areas and has several uses in various commercial zones. Among the various types of metal oxide-based nanoparticles, zinc oxide nanoparticles (ZnO NPs) are frequently used because of their effective properties. The ZnO nanocomposites are risk-free and biodegradable biopolymers, and they are widely being applied in the biomedical and therapeutics fields.

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Multilayer CdZnS (CZS) thin film was deposited on soda lime glass substrates. After deposition, the films were vacuum and air annealed at 100 °C, 200 °C, 300 and 400 °C for 1 h. Effects of vacuum and air annealing on structural, morphological, optical, and electrical properties of multilayer CZS films with increasing annealing temperature (IAT) were studied.

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Tissue engineering is a cutting-edge approach for using advanced biomaterials to treat defective bone to get desired clinical results. In bone tissue engineering, the scaffolds must have the desired physicochemical and biomechanical natural properties in order to regenerate complicated defective bone. For the first time, polymeric nanocomposite material was developed using cellulose and co-dispersed nanosystem (FeO/GO) by free radical polymerization to fabricate porous polymeric scaffolds freeze drying.

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Interactions of ceramic proton conductors with the environment under operating conditions play an essential role on material properties and device performance. It remains unclear how the chemical environment of material, as modulated by the operating condition, affects the proton conductivity. Combining near-ambient pressure X-ray photoelectron spectroscopy and impedance spectroscopy, we investigate the chemical environment changes of oxygen and the conductivity of BaZrYO under operating condition.

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Sodium alginate-f-GO composite hydrogels for tissue regeneration and antitumor applications.

Int J Biol Macromol

May 2022

Department of Mechanical and Industrial Engineering, Qatar University, Doha 2713, Qatar.; Biomedical Research Center, Qatar University, Doha 2713, Qatar.

Biopolymer-based composite hydrogels have attracted tremendous attention for tissue regeneration and antitumor applications. Since sodium alginate is a biopolymer, they offer excellent therapeutic options with long-term drug release and low side effects. To prepare multifunctional composite hydrogels with anticancer and tissue regeneration capabilities, sodium alginate (SA) and graphene oxide (GO) were covalently linked and crosslinked with tetraethyl orthosilicate (TEOS) by the solvothermal method.

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A series of novel spiropyrans were synthesized through the condensation of substituted 3,3-dimethyl-2-methyleneindoline with different nitro-substituted -hydroxy aromatic aldehydes. Indoles were initially substituted with a variety of alkanes and esters moieties. The substituted 3,3-dimethyl-2-methyleneindoline was then reacted with nitro-substituted -hydroxy aromatic aldehydes to yield the respective spiropyrans.

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This study is focused mainly on impact of irrigation water quality in cultivated soil on distribution of essentials nutrients (Al, Mg, Ca, Fe, S, Si, Na, P, and K) and relatively toxic metals (As, Ba, Cr, Cu, Ti, Sn, Mn, Ni, and Zn) using an elegant Laser induced breakdown spectroscopy (LIBS) technique. A pulsed Nd:YAG laser operating at 1064 nm in conjunction with suitable detector was applied to record soil emission spectra. The abundance of these elements were evaluated via standard calibration curve Laser Induced Breakdown Spectroscopy (CC-LIBS) and calibration free Laser Induced Breakdown Spectroscopy (CF-LIBS) approaches.

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The treatment of successive skin wounds necessitates meticulous medical procedures. In the care and treatment of skin wounds, hydrogels produced from natural polymers with controlled drug release play a crucial role. Arabinoxylan is a well-known and widely available biological macromolecule.

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Several significant advancements in the field of bone regenerative medicine have been made in recent years. However, therapeutic options, such as bone grafts, have several drawbacks. There is a need to develop an adequate bone substitute.

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Development of Antibacterial, Degradable and pH-Responsive Chitosan/Guar Gum/Polyvinyl Alcohol Blended Hydrogels for Wound Dressing.

Molecules

September 2021

BioInspired Device and Tissue Engineering Research Group, School of Biomedical Engineering and Health Sciences, Faculty of Engineering, Universiti Teknologi Malaysia, Skudai 81300, Malaysia.

The present research is based on the fabrication preparation of CS/PVA/GG blended hydrogel with nontoxic tetra orthosilicate (TEOS) for sustained paracetamol release. Different TEOS percentages were used because of their nontoxic behavior to study newly designed hydrogels' crosslinking and physicochemical properties. These hydrogels were characterized using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and wetting to determine the functional, surface morphology, hydrophilic, or hydrophobic properties.

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The composite hydrogels were produced using the solution casting method due to the non-toxic and biocompatible nature of chitosan (CS)/polyvinyl alcohol (PVA). The best composition was chosen and crosslinked with tetraethyl orthosilicate (TEOS), after which different amounts of graphene oxide (GO) were added to develop composite hydrogels. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM) and contact angle was used to analyze the hydrogels.

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