Mamdouh Al-Harthi

King Fahd University of Petroleum and Minerals | KFUPM · Department of Chemical Engineering

Thermoplastic polyurethane (TPU) is a widely used polymer for a variety of pressure sensing applications because of its softness and shape memory. This work reports the synthesis of novel TPU-based three-dimensional structured (3D) pressure-sensitive composites via the melt mixing method. Poly-methyl methacrylate (PMMA) microbeads of different size...

Commercially available low-cost polyvinyl alcohol (PVA)/polyethylene glycol (PEG) were used to develop nanocomposites containing different amounts of graphene using the solution casting technique. The shape-memory performance of the developed films was investigated using multiple types of actuations, including thermal heating and microwave (MW) irr...

In this study, three types of cellulose nanocrystals (CNCs) of varied crystallinity (79.91–89.31%), diameters (of 0.1–1 μm), lengths (of 0.8–10 μm) and synthesized at solid to acid ratios (of 1g:20ml to 1g:25ml) were incorporated as a green additive (0–1.5%) in the preparation of cement mortar. The performance of the developed mortar was examined b...

Concrete engineers are always looking for materials that can be employed to improve the mechanical performance and lower the carbon footprint of construction products. In this regard, cellulose, a biobased material presents a massive opportunity for its application in the construction industry. Office paper waste (OPW) is cellulose-rich feedstock a...

LLDPE is a less crystalline polymer with vast industrial and domestic applications. It is imperative to understand the synthesis, processing conditions, and thermal degradation mechanism of the co- as well as terpolymers. This paper reports the in−situ synthesis and thermal degradation studies of the ethylene-propylene copolymer and ethylene-propyl...

In this research work, a novel hybrid composite consisting of biochar (B), layered double hydroxide (CuFe) and chitosan (CS) (B-CuFe-CS) was produced using an ultrasonication-assisted co-precipitation method. The resultant composite was employed for adsorptive removal of Eriochrome black T (EBT) from water. Physicochemical characterization indicate...

This paper reports the study of in‐situ incorporation of NiFe‐(Anion) layered double hydroxides (LDH) in the ethylene‐propylene (EP) (95:05 molar ratio) copolymerization. NiFe LDHs were synthesized with different intercalated anions using the coprecipitation method. The EP/LDH nanocomposites showed improved thermal stability, nevertheless, the vari...

Date palm ( Phoenix dactylifera L) is one of the most widely cultivated crops in different parts of Saudi Arabia. The midribs rich in cellulose, hemicellulose, and lignin are often burnt in the farms, causes severe environmental problems. In the present study, date palm midrib (DPM), these waste materials were powdered and incorporated into polyvin...

In recent years, nanotechnology has become an essential means of producing sustainable and engineered materials, resulting in high value-added products in the construction industry. Nanostructured cellulose (NSC) is a next-generation sustainable and eco-friendly material due to its favorable physicochemical characteristics for various construction...

In this study, layered double hydroxides (LDHs) containing M (Co, Cu, Zn and Ni) and Fe were produced and employed for the removal of Eriochrome Black T (EBT) dye from different water matrices. The characterization results showed that the CuFe and CoFe LDH exhibited excellent crystallinity and excess surface hydroxyl groups with better textural pro...

This study reports the synthesis of date palm waste-derived biochar (B) supported Cu-Fe layered double hydroxides (CuFe LDH) composite by facile co-precipitation method. The adsorption performance of B-CuFe composite was evaluated for the removal of Eriochrome black T (EBT), as a model anionic azo dye, from the aqueous phase. The B-CuFe composites...

The inhibition attributes of drilling formulations typically rely on the type of additives, concentration, and reactivity with shale formations. In this work, the impact of ZnO and polymer on rheological, shale inhibition, and filtration properties were studied. Several drilling formulations were prepared with different concentrations of ZnO and po...

Biochar/layered double hydroxide (LDH) composites have gained considerable attention in recent times as low-cost sustainable materials for applications in water treatment. This paper critically evaluates the latest development in applications of biochar/LDH composites in water treatment with an emphasis on adsorption and catalytic degradation of va...

Diesel-in-water emulsions have several applications in the upstream and downstream petroleum industry. The Diesel-in-water emulsions are not very well understood despite its numerous applications. In this work, water/diesel emulsions were prepared using octylphenol ethoxylate as an emulsifier at different mixing time and speeds, varying surfactant...

Purpose: To evaluate the degree of conversion (DoC) of self-adhesive resin luting cements when irradiated through different fiber post lengths. Methods: A total of 60 teeth were sectioned to achieve lengths of 4 mm, 7 mm, and 10 mm, while 60 fiber posts were trimmed to give 3 mm, 6 mm, and 9 mm lengths. Post space was created to accommodate the fib...

Effects of laser irradiation on the thermal properties and morphological structure of starch, polyvinyl alcohol (PVA) and their blends were studied. Laser irradiation has an insignificant effect on the thermal behaviour of starch and PVA, but it causes an increase in crystallization and melting temperature (T cry and Tm ) for blends as a function o...

A hybrid nanomaterial, low crystallinity graphite-layered double hydroxide, was used as a support for zirconocene catalyst. The hybrid nanomaterial graphite-NiAl layered double hydroxides (G/LDH) were synthesized by the co-precipitation method. The synthesized nanomaterial was used as a support for zirconocene catalyst. The polymerization reactions...

Drilling fluid additives play a vital role in modifying the drilling fluid properties for the ease of drilling operations in oil and gas wells. In this work, two different drilling fluid additives such as titanium oxide nanoparticles and a hydrophobically modified associative polymer were employed to develop several drilling fluid formulations. Var...

A drilling fluid formulation which includes an aqueous phase, and additives including an organophilic clay, a gemini surfactant, and a polyacrylamide. The organophilic clay contains an ion-exchange reaction product of a clay material (e.g. smectite) and quaternary ammonium cations. The polyacrylamide contains reacted units of an acrylamide monomer,...

Removal of dyes from wastewater is one of the major concerns of the modern age. Dendrimers and their composites are emerging as effective materials for an array of applications due to their unique fractal architecture and peculiar characteristics. Herein, we aim to provide a critical review of the application of dendrimer complexes for adsorptive r...

In the reported study, silico-manganese fume (SMF) was developed into an alkali-activated binder (AAB) in combination with blast furnace slag (BFS) by adding NaOH and Na2SiO3. The effect of curing on the resulting AAB was studied by water-ponding, ambient-curing and heat-curing. In the first phase, the period of oven-curing (3–24 h) at 60 °C was op...

The mechanistic aspects of improved aqueous removal of methyl orange (MO) dyes using high performance novel MgAlNi barium-ferrite (MgAlNi-BaFe) ternary double layer hydroxide (LDH) nanocomposites is reported in this study. Detailed surface characterization coupled with kinetic, equilibrium, thermodynamics and regeneration studies were undertaken un...

Ni‐Al layered double hydroxide/graphene hybrid fillers were prepared via co‐precipitation method. The structural and thermal studies of these fillers were conducted using X‐ray diffractometer (XRD) and thermogravimetric analyzer (TGA). Subsequently, by using solution casting method, these fillers were introduced into the polyvinyl alcohol (PVA)/sta...

This study investigated the impact of pyrolysis conditions on physical characteristics of date palm fronds biochars and their performances for aqueous uptake of anionic dyes -methyl orange (MO) and eriochrome black-T (EBT)- and cationic dyes - methylene blue (MB) and crystal violet (CV). Detailed characterization of the biochars revealed abundant f...

In this study, a new magnetic adsorbent, strontium ferrite-bentonite-CoNiAl composite (SF-B-CoNiAl), was synthesized via co-precipitation technique and employed for the adsorptive removal of two anionic dyes, Eriochrome Black T (EBT) and Methyl Orange (MO) from water. The surface functionalities, structure and morphology of the new adsorbent (SF-B-...

MgAl-layered hydroxide intercalated date-palm biochar composites (B-MgAl-LDH) functionalized with improved textural properties and surface functionalities were fabricated by a facile coprecipitation technique and fully characterized by various techniques. The B-MgAl-LDH were employed for enhanced aqueous uptake of methylene blue (MB) (Langmuir qmax...

Crystallization occurs in processing i‐PP‐GnP nanocomposites, and these nanocomposites have the potential to replace traditional fillers and be used to fabricate advanced materials and technology. Therefore, this subject was comprehensively investigated by applying a recent crystallization model, non‐isothermal DSC experiments, Raman spectroscopy,...

In this study, graphene (G) was used as a substrate for NiMgAl ternary-layered hydroxide using coprecipitation technique. The pristine NiMgAl (NMA), graphene-NiMgAl (G/NMA) and their respective calcined products NMA-C and G/NMA-C were investigated as adsorbents for the removal of hazardous eriochrome black T (EBT) dye from an aqueous phase. Charact...

In this study, different sludge-based adsorbents were synthesised using ZnCl2 (Zn-SBACs) and NaOH (Na-SBACs) under varying experimental conditions and subsequently employed for simultaneous aqueous uptake of phenol, resorcinol, and catechol. Response surface modelling (RSM) technique was employed to evaluate and optimise the collective influences o...

Drilling fluids are considered as blood of drilling industry for the extraction of oil and gas. Many chemical additives are employed to formulate drilling fluids, but water-soluble polymers play vital role to adjust rheological and filtration properties. Natural and conventionally used polymers in drilling fluids show degradation at high temperatur...

The Polymer nanocomposite have fascinated the strong interest due to its capitative properties and potential use for smart drilling fluids in the petroleum industry. Water based drilling fluids are employed for drilling oil and gas wells to extract hydrocarbons from reservoirs. The formulation of drilling fluid includes various additives to control...

This study investigated the effect of alkaline activators - NaOHaq (NH) (NH: 0-16 M) and Na2SiO3aq (NS) (NS/NH: 0-3.5) in the synthesis of silico-manganese fume (SMF) and ground blast furnace slag (BFS) blended alkali-activated mortar (AASB). The use of individual activator was ineffective in producing AASB of sufficient fresh and hardened properti...

This study was aimed at developing novel and sustainable alkali-activated binder of silico-manganese fume (SMF) and ground blast furnace slag (BFS) at room temperature. The level of BFS substitution was varied from 0 - 50% and activation was done using 10 M NaOH and Na2SiO3 of an initial silica modulus of 3.3. The Na2SiO3/10MNaOH ratio was kept con...

MgAlNi-BaFe ternary layered hydroxide (UMLDH) and its calcined (CMLDH) form were synthesized and tested as adsorbents for methyl orange dye (MO) uptake from water. The adsorptive performances of the new magnetic nanocomposites were modeled, evaluated and optimized via response surface methodology (RSM). The UMLDH and CMLDH maximum removal efficienc...

Nanotechnology has been widely employed in the oil gas sector to improve the extraction of fossil fuels from reservoirs. Nanoparticles in the formulation of drilling fluids showed remarkable properties especially reduced fluid loss and filter cake thickness, better rheological properties and stabilized reactive shale formations. This paper discusse...

Hydration of shale formations during drilling operations have adverse effects on wellbore stability. The shale hydration resulted from the interactions between drilling fluid and swelling clay contents in the shale formations. This paper addresses the improvement of wettability and hydration properties of shale to enhance the wellbore stability dur...

A method for producing a polyethylene nanocomposite by polymerizing ethylene in a polymerization mixture that contains a graphene-layered double hydroxide nanocomposite, a metallocene catalyst, an alkylaluminoxane co-catalyst, and an organic solvent to form a polyethylene nanocomposite in which the graphene-layered double hydroxide nanocomposite is...

In the reported study, the effect of slag content and curing methods on the strength development of alkaline activated (AA) silico-manganese fume (SiMnF (S)) and ground granulated blast furnace slag (GBSF (G)) blended mortar using NaOHaq and Na2SiO3aq was studied. The mixtures were prepared with 100% SiMnF (AAS100G0), i.e. control binder or 70% SiM...

Ternary layered double hydroxide, MgCoAl (MCA) and its graphene-based composite (G/MCA) were fabricated via a simple co-precipitation technique. The composites along with their calcined products (MCA-C) and (G/MCA-C) were used as adsorbents for the removal of an anionic dye, methyl orange (MO), from aqueous phase. The characterization results (scan...

This article discusses the effect of microwave irradiation on the thermal properties of poly(vinyl alcohol)/graphene nanocomposites, prepared using a solution casting technique. Samples were subjected to microwave radiation for 5, 10 and 15 min at a constant power of 200 watts. The crystallinity and thermal stability of the irradiated samples were...

In this work, cobalt-aluminum-layered double hydroxide (CoAl) and its bentonite composite (Bent-CoAl) were utilized for adsorption of Cr(VI) from water. Incorporation of bentonite into layers of CoAl resulted in significant improvement in the adsorptive performance with increased BET surface area, without damaging LDH structure. The adsorption proc...

Hybrids of layered double hydroxide (LDH) are emerging as robust adsorbent materials for the removal of toxic organic dyes from wastewater. The LDH-containing hybrids have shown excellent adsorption performance owing to their large surface area and chemical stability. These hybrids are non-toxic, cost-effective, and readily available and can easily...

This article is devoted to the study of the effect of date palm seed (DPS) powder on the properties of recycled linear low-density polyethylene (RLLDPE) matrix. A series of composites was developed with a different filler loading varying from 0 to 30 wt% using twin screw extruder followed by compression molding. The result analysis showed that the...

Water-based drilling fluids (WBDFs) are widely used for drilling oil and gas wells. Water-based drilling fluids are considered economical and environmentally friendly compared to synthetic and oil-based drilling fluids. Water is one of the major constituents of WBDFs but causes the swelling of clay minerals in wellbore formations. Clay swelling in...

High performance drilling fluid was designed for unconventional reservoirs to minimize the formation damage and borehole instability using organophilic clay treated with trimethyloctylammonium bromide, novel in-house synthesized gemini surfactant and a high molecular weight polymer. This gemini surfactant has not been reported in the literature for...

The use of green and environmental-friendly resources is a priority in scientific research nowadays. In this study, the seeds, pods and leaves of the Parkia speciosa were used as a reduction agent in the green synthesis of Ag/AgO nanoparticle additives. The synthesized Ag/AgO nanoparticles were blended into a polymer dope during the preparation of...

A new geopolymeric material has been fabricated from local Saudi Arabian resources using inorganic mineral polymerization technique. In this technique, the mineral polymer is synthesized from the following components: naturally occurring kaolin clay mineral, silica sand, sodium hydroxide, and water. Homogeneous samples of known amounts of clay mine...

This study details about the synthesis of micro-crystalline cellulose prepared from olive pits, the waste material obtained in olive industry, and the effect of these fillers on the tensile and thermal properties of polyvinyl alcohol/starch blends. Micro-crystalline cellulose from olive pits was prepared, and its size was measured using particle si...

Date palm ash (DPA) and MgAl-layered double hydroxide (LDH) composites were synthesized by the co-precipitation method and characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), X-ray diffraction (XRD), and Brunauer–Emmett–Teller (BET). The DPA-MgAl-LDH (DPA/MgAl) composites were employed for the remova...

Water-soluble polymers such as poly(vinyl alcohol) (PVA) and poly(ethylene glycol) (PEG) and their nanocomposites with graphene were prepared by using a solution mixing and casting technique. The effect of different PEG loadings was investigated to determine the optimum blend ratio. The films were characterized using Fourier transform infrared spec...

The influence of multiwalled carbon nanotubes (MWCNTs) on the properties of polyethylene prepared by in situ polymerization using metallocene catalyst (Cp 2 ZrCl 2 ) in combination with methylaluminoxane has been studied. The MWCNT was incorporated in the polymer matrix adopting a stirring method. Incorporation of MWCNT causes a drop in molecular w...

In this work, the effect of thermal aging and electrolyte on the rheological and morphological properties of bentonite dispersion was studied. Previous studies reported the effect of electrolyte concentration and thermal aging on bentonite rheological properties but detailed morphological studies of the effect of electrolyte and thermal aging of be...

Natural weathering of high‐density polyethylene (HDPE) and its graphene nanocomposites was studied. The nanocomposites, prepared by in situ polymerization of ethylene, were exposed to the natural environment for 30, 60, and 90 days. The effects of weathering on the crystallinity, melting temperature, and lamellar thickness distribution were studied...

The successful drilling operation of oil and gas wells required high quality of drilling fluids which can stabilize well formations and able to withstand deep wellbore conditions of elevated temperature. Wellbore formations are mainly composed of shale (soft clay) and are likely to destabilize upon interacting with water. The instability of wellbor...

EBT Adsorption mechanism mainly involves complexation and electrostatic interaction. Abstract This work reports on layered double hydroxide (LDH) based nanocomposites synthesized via a co-precipitation method with the incorporation of bentonite. The produced bentonite-supported CoAl-LDH (B-CoAl) was employed as an adsorbent for removal of Eriochrom...

Nanofiller based on graphene and MgAl layered double hydroxides (G/LDHs) were synthesized successfully by co-precipitation method with varying graphene contents. The in situ polymerization of ethylene was conducted using 1-hexene as comonomer, zirconocene as a catalyst, MAO as co-catalyst, and G/LDHs as drop-in nanofiller. An increase in catalytic...

In this work, the impact of molecular structure such as the degree of hydrolysis (DOH) and nature of comonomers in acrylamide-based copolymers on the rheological and filtration properties of bentonite dispersions was assessed using three different water-soluble polymers for water-based drilling fluids. These polymers are (1) copolymer of acrylamide...

In this study, the effect of polymer structure, the degree of hydrolysis, chemical structure of monomer in the backbone, and charge distribution of monomer groups on rheological and filtration properties of Bentonite (Bent)/polymer dispersions were assessed. Two different water-soluble polymers were employed to investigate the rheological and filtr...

Non-isothermal crystallization behavior of poly(vinyl alcohol)/starch and poly(vinyl alcohol)/starch/graphene nanocomposites was studied using differential scanning calorimetry (DSC). Ozawa and Mo models were used to analyze the non-isothermal kinetics. The differential Friedman method was used to evaluate the effective activation energy (EA) of th...

Starch-NiFe-layered double hydroxide (S/NiFe-LDH) composite was prepared via co-precipitation method and employed as an adsorbent for the removal of anionic dye methyl orange (MO) from aqueous solution. Two hybrids with different ratio of starch and NiFe-LDH were prepared i.e. S/NiFe-LDH (1:1) and S/NiFe-LDH (2:1) and their adsorption performance w...

Crystallization and melting are integral parts of the isotactic polypropylene (i-PP) end-product fabrication process. Therefore, the nonisothermal crystallization kinetics and melting behavior of an un-nucleated commercial i-PP have been pursued by integrating a new nonisothermal crystallization model, Flory's thermodynamic equilibrium theory, Gibb...

Electrical and dielectric properties of poly(vinyl alcohol) (PVA) films, and PVA/starch blend and its nanocomposites with graphene were investigated. The tested materials were prepared via solution mixing and an evaporative casting technique using glycerol as a plasticizer. Differential scanning calorimetric (DSC) measurement data was used to calcu...

Polyvinyl(alcohol)/starch/graphene nanocomposites with enhanced properties were prepared by solution mixing and casting process with the aid of glycerol as plasticizer and citric acid (CA) as crosslinker. The dispersion of graphene in water was made by sonication prior to mixing it with PVA/starch solution. The effect of varying the concentration o...

Abstract With rapidly growing industrial development worldwide, the need for a new class of nanoparticles and techniques for treating wastewater remains a major concern to protect the environment. Layered double hydroxides and particularly LDH-containing hybrids are emerging as potential nano-sized adsorbents for water treatment. Recent studies hav...

In this study, polyester elastomer-based thermoplastic (TPEE) nanocomposites were fabricated for flame-retardant applications. Small amounts of graphene and nanoclay were added to the nanocomposites to investigate their effects on the mechanical and thermal properties of the nanocomposites. The addition of a phosphorous flame-retardant additive res...