Walid M Daoush

Helwan University · Production technology

Manufacturing active and economical catalysts and using them in water treatment is one of the most important challenges facing researchers. Spent batteries signify a source of harmful materials when discarded without suitable treatment. In this work, a black paste as one of the main components of spent battery doped with different ratios of TiO2 na...

This manuscript explores the applications and advancements in three-dimensional (3D) printing with a focus on incorporating additive particles with unique properties into polymer composites. The benefits of 3D printing, such as design flexibility and rapid prototyping, are discussed along with the challenges of incorporating reinforcement materials...

This paper investigates a new type of metal matrix composite, namely elemental metal matrix composites (EMMC), where a matrix contains elemental metal powders joined at selective interfaces with other property-enhancing powders to strategically preserve properties of individual constituents. These composites have the potential advantage of reduced...

Introduction: Increased mortality owing to breast and lung cancer is an urgent global medical issue. Nanotherapy is one of the most widely used and recent procedures for combating cancer. Therefore, this study aimed to assess the beneficial effects of multi-walled carbon nanotubes (MWCNTs) to precisely target breast (MCF-7) and lung cancer (A549) c...

In this study, we enhanced the adhesion of graphene nanosheets to achieve homogeneous dispersion, consequently improving the electrical and thermal conductivity, coefficient of thermal expansion, and corrosion resistance with an aluminum matrix containing up to 1.5 wt. % graphene. First, 2.5 wt. % Al2O3 and varying ratios of graphene up to 1.5 wt....

In this work, paste@TiO2 nanocomposite was manufactured via an ultrasonication process, and the obtained nanomaterials were investigated using various characterization techniques (XRD, BET, SEM, and FTIR). The findings indicated a high crystallinity of the paste@TiO2 nanocomposite material with a crystallite size of 12.16 nm and a specific surface...

A number of different research methodologies have been developed to increase the con- ductivity and mechanical properties of stretchable or flexible conductors. One of the promising techniques recommended for applying metallic nanoparticles (NPs) to PDMS (polydimethylsiloxane) substrate is to develop a thin-film that gives possible conductivity and...

A number of different research methodologies have been developed to increase the conductivity and mechanical properties of stretchable or flexible conductors. One of the promising techniques recommended for applying metallic nanoparticles (NPs) to PDMS (polydimethylsiloxane) substrate is to develop a thin-film that gives possible conductivity and g...

Exfoliating graphite to graphene nanosheets by mechanical ball milling with alumina, coating alumina particles with graphene layers to enhance their electrical and thermal properties, minimizing aluminum composite's production time, and improving the adhesion between the matrix and reinforcement were the aims of this study. Ball milling (BM) follow...

This Special Issue covers various aspects of materials science and engineering in the eld of the fabrication of hybrid and composite materials. It mainly focuses on the novel developments in and new processing methodologies for the fabrication and modi cation of carbon and related hybrid and composite materials for different applications. It consis...

With extensive production and various applications of silica nanoparticles (SiNPs), there is a controversy regarding the ecotoxicological impacts of SiNPs. Therefore, the current study was aimed to assess the acute toxicity of silica nanoparticles in male Rattus norvegicus domestica after 24 and 96 h. Hematological, serum biochemical, stress biomar...

Silica nanoparticles (SiNPs) are a new class of nanomaterials with unique properties due to their nanoscale size. Currently, SiNPs constitute a potential value in aquaculture; nonetheless, misuse induces toxicity to fisheries and ecosystems. Hence, the present prospective is a pioneer study that illustrates the acute toxicity of SiNPs to African ca...

Polycrystalline cBN/copper composite abrasive particles were prepared by an electroless powder coating process. Ti metallization and tin/silver metallization techniques were used to improve the coating process by depositing an autocatalytic metallic layer on the surface of the cBN particles. Metallized, as well as un-metallized, cBN particles were...

This study recommends Carbopol/zinc oxide (ZnO) hybrid nanoparticles gel as an efficient antibacterial agent against different bacterial species. To this end, ZnO nanoparticles were synthesized using chemical precipitation derived from a zinc acetate solution with ammonium hydroxide as its precipitating agent under the effect of ultrasonic radiatio...

Among toxic pollutants, Mercury (Hg) is a toxic heavy metal that induces harmful impacts on aquatic ecosystems directly and human being's health indirectly. This study confirmed the in vitro magnetic potential of magnetite Nano-Particles (Fe3O4 NPs) against waterborne Hg exposure-induced toxicity in Nile tilapia (Oreochromis niloticus). We further...

The present study aimed to develop the synthesis of zinc oxide nanoparticles (ZnO-NPs) using the green method, with Aloe barbadensis leaf extract as a stabilizing and capping agent. In vitro antitumor cytotoxic activity, as well as the surface-functionalization of ZnO-NPs and their drug loading capacity against doxorubicin (DOX) and gemcitabine (GE...

Breast and colon carcinomas are two types of common cancers which lead to cancer-related deaths. Due to their cytotoxic potential against cancer cells, recently many studies of copper nanoparticles (CuNPs) have been conducted. In the current work, we aim to evaluate the cytotoxic and apoptosis-inducing effects of CuNPs on the human breast (MCF-7) a...

Carbon long fiber/copper composites were prepared using electroless and electroplating methods with copper metal for potential aerospace applications. Carbon fibers were heat-treated at 450 ◦C followed by acid treatment before the metallization processes. Three different methods of metallization processes were applied: electroless silver deposition...

This Special Issue on “Fabrication of Carbon and related materials/ Metal Hybrids and Composites” focuses on novel developments and new processing methodologies in the fabrication and modification of carbon and its structure related materials and surface functionalization to improve its surface activities, catalytic application and to increase its...

Using plant extracts has been interesting as possible eco-friendly methods to synthesis and stabilize different types of nano-particles. Zinc oxide nanoparticles (ZnO-NPs) can be used as effective adsorbent due to their high surface area to volume ratio and high spontaneous adsorption properties. In this research, ZnO-NPs were synthesized and stabi...

The addition of transition element oxides to tungsten heavy alloys (WHAs) fabricated by powder metallurgy technique provides new materials with higher density and electrical conductivity, which may be adequate in some applications such as kinetic energy penetrators. Additionally, materials with higher electrical conductivity are required for electr...

Metallic foams have been gaining significant interest because of their unique properties. The present study investigates the processing of microscale particles of aluminum–titanium dihydride foaming precursors, together with their foaming characteristics. The external and internal features and dimensions of these precursor particles were found to b...

(Tantalum, niobium) carbide-nickel composites were prepared by the powder metallurgy technique. Microsize (tantalum, niobium) carbide particles were reinforced in the nickel matrix. Different nickel contents were added to (tantalum, niobium) carbide powders by two different methods, namely, blending and electroless coating. The results of the micro...

Copper oxide nanoparticles were synthesized by using Camellia Sinensis leaves extract as a reducing and capping agent of the copper ions in solutions and its azodyes adsorptive efficiency were studied. The produced copper oxide nanoparticles were subsequently characterized by SEM, TEM, XRD, FTIR, and UV spectrophotometer for investigating its parti...

Carbon short bers/copper composites with di erent carbon short ber contents up to 15 wt.% as reinforcements are prepared to investigate the in uence of the carbon short ber surface coating on the microstructure, density, and electrical properties of the carbon short bers/copper composites. The carbon short bers were surface treated by acid function...

Nickel/detonated nanodiamond composites were prepared using the powder metallurgy tech- nique. Detonated nanosized diamond particles were reinforced in the nickel matrix. The investi- gated powder was used to prepare homogenous diamond/nickel composite mixtures with different detonated nanodiamond content of weight percentage (0.2, 0.4, 0.6, and 0....

Ni matrix composites reinforced with different content of α-SiC particles up to 4 wt. % have been fabricated by powder blending followed by powder technology process. The produced SiC/Ni composite powder mixtures underwent cold compaction at 400 MPa in a uniaxial die followed by sintering in a controlled furnace at 1000oC under sintering atmosphere...

A green synthesis of copper oxide nanoparticles and its removal efficiency of azodye were studied. Biosynthesis of stable copper oxide nanoparticles were preformed using Aloe barbadensis leaf extract as a size and shape-directing agent for preparing of spherical copper oxide nanoparticles by calcination at 400 °C. The leaf extract of Aloe barbadens...

W:Ti)C cemented carbides with different Ni content fabricated by powder metallurgy technique were investigated. The Ni powder which used as a metal binder of the (W:Ti)C-Ni abrasive particles was fabricated by water atomization technique by means of induction furnace. A Ni powder of a cubical particle shape with average particle size of 2-20 μm was...

Electrodeposition and stripping of Zn, Mn and Ni metals and their alloys were investigated in an aqueous sulfate solution. The effect of coating processes and its impact on the substrate were evaluated by investigating the prepared alloys with X-ray diffraction analysis, scanning electron microscopy and atomic absorption spectroscopy. The electrode...

Microsize Powders of Ni and Cu were prepared by water atomization technique to fabricate metal matrix composites containing various percentages of nanosized boron nitride particles (1, 2, 3, 4, 5 wt. % of BN in a matrix containing (20 wt. %Ni and 80 wt. %Cu). The prepared mixtures were cold compacted under 400 MPa, and sintered for 2 h at 1000 °C i...

In the present work, a design of experiment (DOE) technique using Taguchi method, has been applied to optimize the properties of ODS tungsten heavy alloys(WHAs). In this work Taguchi method involves nine experiments groups for four processing parameters (compaction pressure, sintering temperature, binding material type, and oxide type) with three l...

Copper/silicon nitride (Cu/Si3N4) composites are fabricated by powder technology process. Copper is used as metal matrix and very fine Si3N4 particles (less than 1 micron) as reinforcement material. The investigated powder were used to prepare homogenous (Cu/Si3N4) composite mixtures with different Si3N4 weight ercentage (2, 4, 6, 8 and10). The pro...

Nickel was used as a metal binder for tantalum niobium carbide (Ta, Nb) C cermets. Different Ni content was added to the (Ta, Nb) C powders by two different methods namely, mixing and electroless powder coating. The chemical compositions of the powdered composites were adjusted to be 5 wt.%, 10wt.%, and 15wt.% Ni. The produced composite powders wer...

Coating is a good method for manufacturing a wide range of new materials especially in the form of composites for giving good adhesions between the support and the coating layer. There are many methods for preparing new materials depending on its application; some methods are highly difficult as chemical and physical vapor depositions. Electro and...

This paper discusses the fabrication of tungsten (W)–copper (Cu) nanocomposites via an ultra-rapid Current-Activated Melt Infiltration (CAMI) process to produce W–Cu nanocomposites for the first time in a matter of seconds. This was accomplished through a unique composite powder layer arrangement that promotes efficient resistive heating as compare...

Oxide dispersion-strengthened (ODS) tungsten heavy alloys are well known for their excellent mechanical properties which make them useful for a wide range of high-temperature applications. In this investigation, microstructural, magnetic, and mechanical properties of W-5 wt pct Ni alloys reinforced with 2 wt pct Y2O3, ZrO2 or TiO2 particles were in...

Abstract Copper as well as copper base composites reinforced with coated and uncoated 1 wt% diamond, graphite particles or short carbon fibers are prepared by powder metallurgy process. The reinforcement particles were encapsulated with silver as well as copper layer by using the electroless deposition technique to investigate the influence of the...

Mixed and coated (Ta, Nb)C/Ni cermets are produced by the powder metallurgy route. The applied Ni content of present cermets is 5%, 10% or 15% Ni. Samples are compacted at 400 MPa and sintered at 1450 oC for 90 min. X-Ray Diffraction, SEM and ADEX analysis are used to study the microstructure. Physical properties such as saturation magnetization, e...

This paper describes the production of metallic foam precursors in 'particle' form as opposed to the typical consolidated bulk compacts. Mechanical milling was used to produce coarse composite particles of aluminum and titanium di-hydride as foaming precursors. The effect of foaming temperature on the resulting products is discussed. The porosity c...

Mixed and coated (Ta, Nb)C/Ni cermets are produced by the powder metallurgy route. The applied Ni content of present cermets is 5%, 10% or 15% Ni. Samples are compacted at 400 MPa and sintered at 1450 o C for 90 min. X-Ray Diffraction, SEM and ADEX analysis are used to study the microstructure. Physical properties such as saturation magnetization,...

Ti-12Mo-6Zr/Al2O3 (titanium biomaterial) was prepared by a powder metallurgy route using Spark Plasma Sintering (SPS). Ti, Mo, and Zr powders were mixed by wet milling with different content of alumina nanoparticles (up to 5 wt pct) as an oxide dispersion strengthening phase. Composite powder mixtures were SPSed at 1273 K (1000 °C) followed by heat...

Cubic boron nitride particles coated by titanium nitride (TiN/cBN) as well as diamond particles coated by titanium carbide (TiC/diamond) were prepared by Ti molten salt deposition followed by heat-treatment process. cBN or diamond particles were mixed separately with Ti powders and molten salts (KCl, NaCl and K2TiF6). The mixture was heated at 900...

In the present work, a ferrochrome powder scrap was used for preparing fine chromium powder by leaching process in hydrochloric acid. On the other hand, the remaining iron chloride was used for produce magnetite powder by thermal decomposition of organo-metallic compound of iron chloride with EDTA. Particle size and magnetic properties of prepared...

Platinum/nickel bimetallic nanoparticles supported on multi-walled carbon nanotubes (xPtNi/CNTs) were synthesised. The fabrication process includes the chemical modification on the graphene surface of CNTs by acid treatment and the subsequent deposition of Pt or PtNi bimetallic nanoparticles with different compositions of Pt (x = 100, 90, 80 and 70...

Nickel matrix composites reinforced with different weight percent of Al2O3 short fibres have been fabricated by powder technology route. The Al2O3 short fibres were encapsulated by nickel layers using the electroless deposition technique. The produced Al2O3/Ni composite powders underwent cold compaction and sintering at 850oC. The Al2O3/Ni powders...

The SiC nanoparticulate reinforced Al matrix composites (with 2.5–12.5 vol%) were successfully fabricated by employing high energy ball milling with cold-pressing and sintering technology at 550 °C for 1 h. Microstructures and nanoparticulate distribution were analyzed with scanning electron microscope (SEM), X-ray diffraction (XRD) and transmissio...

A novel reduction technique has been developed to synthesize nano-sized tungsten heavy alloys powders and compared with the same powders processed by mechanical alloying technique. In the first method, nano-sized tungsten heavy alloys powders have been obtained by reduction of precursors obtained by spray drying of several appropriate aqueous solut...

A novel method for analysing structural health of alumina nanocomposites filled with graphene nanoplatelets (GNP), carbon nanotubes (CNTs) and carbon black nano-particles (CB) is presented. All nanocomposites were prepared using novel colloidal processing and then by Spark Plasma Sintering. Good homogeneous dispersion was observed for all carbon fi...

Multiwalled carbon nanotubes/Pd nanoparticles (CNT/Pd) were prepared by different four synthesis techniques. After the chemical oxidation of CNTs, the infrared absorption data indicated the existence of several functional groups loaded on the CNTs surfaces. The first Pd deposition technique went through the processes of Sn sensitization and Pd depo...

Carbon nanotube/silver (CNT/Ag) nanocomposites include CNT volume fraction up to 10 vol.% were prepared by chemical reduction in solution followed by spark plasma sintering. Multiwalled CNTs underwent surface modifications by acid treatments, the Fourier transform infrared spectroscopy data indicated several functional groups loaded on the CNT surf...

Carbon nanotube (CNT)/silver nanocomposite powders with different volume fractions of CNTs 2.5, 5 and 10 vol.% were prepared by chemical reduction in solution. Multi-walled CNTs underwent surface modifications for functionalisations by acid treatments. The acid-treated CNTs were investigated by FT-IR and X-ray photoelectron spectroscopy. The spectr...

Copper/Si3N4 composites have been produced by powder metallurgy rout. Particle coated with Cu metal is an appropriate solution to enhance the interfacial bonding as well as physical and mechanical properties of the Cu/Si3N4composites. Electroless Cu coating of Si 3N4 particles with different weight % were achieved. The produced Si3N4 /Cu composite...

Aluminum silicon alloy of composition (Al-25%Si-3%Ni-1%Fe-2%Cu) was atomized using water atomization. The powders were cold compacted in a die to produce green cylinder compacts. Four consolidation processes were applied, namely; conventional sintering at 500℃, sintering followed by hot forging to obtain pistons, one step hot forging into pistons,...

Spark plasma sintering has been applied to consolidate tungsten copper alloys made by different powder fabrication routes, ranging from milling, chemical coating, mixing, and oxidation-reduction, with different starting powder particle size. The consolidation response has been compared between different powders. Copper content, tungsten particle pa...

The binary system of tungsten-copper lacks mutual solubility between its components. The refractory properties of tungsten and the high conductivity of copper are used to produce functionally graded composites. Production of W-Cu composites is usually done by means of copper infiltration into porous tungsten or through liquid phase sintering of a p...

In this article, magnetite nanopowder was synthesized by thermal decompositions of iron salts in the presence of ethylene diamine tetra acetic acid (EDTA). The iron chloride underwent complex formation reaction with (EDTA) followed by thermal decomposition of the iron complex by boiling to produce the magnetite powder. The prepared powders were inv...

Composite material is a tailor-made material which provides extraordinary flexibility to design the required properties to suit an application. Density and homogeneity of the composites are very important factors in the engineering applications because in-homogeneity and residual pores are harmful to the mechanical and physical properties of the co...

A broad range of experiments are reported on how different powder preparation routes influence the sintering response and properties of tungsten-copper alloys. The experiments include various powder preparation routs ranging from simple mixing, attritor milling, milling of oxides with subsequent hydrogen reduction, to electrolytic coating. The char...

A broad range of experiments are reported on how different powder preparation routes influence the sintering response and properties of tungsten-copper alloys. The experiments include various powder preparation routs ranging from simple mixing, attritor milling, milling of oxides with subsequent hydrogen reduction, to electrolytic coating. The char...

Multiwalled carbon nanotube/copper (CNT/Cu) nanocomposite powders with different CNTs volume fractions were prepared by electroless Cu deposition on the CNTs. The CNTs underwent acid treatment, sensitization and electroless copper deposition on their surface respectively. The microstructure of the prepared CNT/Cu nanocomposites was investigated by...