Mohamad AlSalhi

Mohamad AlSalhi
King Saud University | KKUH · Department of Physics and Astronomy

PhD

About

321
Publications
87,926
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
7,192
Citations
Additional affiliations
March 1988 - present
King Saud University
Position
  • Professor (Full)

Publications

Publications (321)
Article
This study aims to discuss blood volume (BV), total hemoglobin concentration quantification, and ultrasound signal variations for their correlation with photodynamic therapy-induced modifications in the tumor and possibly with tumor response. The images were interpreted in the frequency domain by applying a two-dimensional fast Fourier transform to...
Article
Full-text available
In this study, the blood volume and oxygen saturation of tumors were measured after photoacoustic imaging (PAI) under conditions of pre-photodynamic therapy (PDT), post-PDT, and 4 hrs, and 24 hrs post-PDT. PDTs with aminolevulinic acid (ALA) and low and high doses of benzoporphyrin derivative (BPD) were conducted to observe oxygen saturation change...
Article
V4+-rich V2O5/carbon aerogel (V4+-V2O5/CA) composites were synthesized as electrode materials for supercapacitors via in-situ hydrolysis-condensation processing. Carbon aerogel (CA) promotes the deposition of amorphous vanadium oxide and catalyzes the crystallization of V4+-rich V2O5 nanosheets at much reduced temperature. With a uniform distributi...
Article
The experimental reports of structural modification, mechanical and magnetic properties of the Saudi meteorite were studied and discussed. The meteorite specimen was studied using the following different characterization techniques like X-ray powder diffraction, scanning electron microscopy, backscattered electron imaging, Energy Dispersive X-Ray A...
Article
Full-text available
In this research work, the linear and nonlinear optical properties of linear low-density polyethylene (LLDPE) composites with anatase phase of titanium dioxide nanoparticles in different weight percentages are investigated. Solvent casting method have been used to synthesize the thin film of LLDPE/anatase nanocomposites. Thin films are characterize...
Article
PM-355 polymeric solid state nuclear track detectors were studied. Samples were irradiated with alpha particles before and after exposure to sunlight under various seasonal conditions. Track formation and optical characteristics of chemically etched samples were investigated. X-ray diffraction (XRD) analysis showed that the dominant structure of th...
Article
Full-text available
The deployment of biological resources for the synthesis of nanoparticles of metals and metal oxides is the latest addition to green chemistry. The present work describes the use of aqueous stem extracts of Aristolochia indica and Indigofera tinctoria for the synthesis of silver and gold nanoparticles (Ag and Au NPs). The synthesized NPs were chara...
Article
Full-text available
In the present investigation, biocorrosion inhibition efficiency of Syzygium aromaticum (clove) aqueous extract on carbon steel in presence of four corrosion causing bacterial strains (Bacillus subtilis, Streptomyces parvus, Pseudomonas stutzeri, and Acinetobacter baumannii) was explored. Weight loss, potentiodynamic polarization, and AC impedance...
Article
The present study involves fabrication and photovoltaic characterization including impedance properties of dye-sensitized solar cells based on natural dye from beetroot. The electrode of the cell was prepared with commercial Fluorine-doped Tin Oxide glass with 100 micrometer layer of nanostructured TiO2 whereas, the counter electrode consisted of p...
Article
The two-dimensional (2D) layered molybdenum disulfide (MoS2) material represents a nominee potent for optoelectronic devices application. In this research work, the experimental characterizations of 2D- MoS2 thin films are reported in terms of various microscopic and spectroscopic techniques. The synthesized MoS2 thin films are grown by employing t...
Article
Full-text available
In this work, we investigate the TD-DFT simulation, optical, and mirrorless laser properties of conjugated polymer (CP) Poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-diphenylene-vinylene-2-methoxy-5-{2-ethylhexyloxy}-benzene)], also known as (PFO-co-PPV-MEHB) or ADS125GE. TD-DFT calculations were performed for three monomer units with truncated tail...
Article
Full-text available
The notable photophysical characteristics of perovskite quantum dots (PQDs) (CsPbBr3) are suitable for optoelectronic devices. However, the performance of PQDs is unstable because of their surface defects. One way to address the instability is to passivate PQDs using different organic (polymers, oligomers, and dendrimers) or inorganic (ZnS, PbS) ma...
Article
Objective Absorption spectroscopy and calorimetry has been a very convenient tool in the diagnosis of a variety of diseases. In recent times, fluorescence emission spectroscopy is proposed to be a more sensitive technique for disease detection. Methods: In this context, fluorescence emission spectra have been obtained from blood and urine samples f...
Article
Turbinaria ornata is brown marine macroalgae contains diverse bioactive components exhibiting various biomedical properties. This study intends to analyze the inhibitory effect of Hexadecanoic acid (HA) of T. ornata on HT-29 human colon cancer cells. The isolated compound were characterized using UV, FT-IR and GC-MS analysis respectively. The HA wa...
Article
Cadmium and zinc are leading heavy metal pollutants causing serious health problems when discharged into the aquatic environments. The present investigation focused on the bioaccumulation of Cd²⁺ and Zn²⁺depending on the sorption process by Bacillus amyloliquefaciens HM28. The selected bacterium was multi-metal (Zn²⁺, Pb²⁺, Cd²⁺, Cu²⁺ and Li⁺) and...
Article
Spectral diagnosis was carried out on volunteer blood samples (N = 100). The samples were subjected to different diagnostic methods including conventional complete blood count (CBC), hemoglobin electrophoresis (HBE) and our spectral diagnosis. For the spectral diagnostic method, we discriminated three different characteristic spectral features. In...
Article
Full-text available
The influence of SiO2/TiO2 nanocomposites (STNCs) content on non-radiative energy transfer (Förster-type) from poly (9,9′-dioctylfluorene-2,7-diyl) (PFO) to poly [2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) using steady-state and time-resolved photoluminescence spectroscopies was investigated at room temperature. The improved ene...
Article
Full-text available
This study aimed to characterize the biofilm microbial community that causes corrosion of API 5LX carbon steel. API 5LX carbon steel coupons were incubated with raw produced water collected from two oil reservoir stations or filter-sterilized produced water. Biofilm 16S rRNA amplicon sequencing revealed that the bacterial community present in the b...
Article
Conductor-insulator (CI) bilayers are the cornerstone of understanding the leakage current and charge transport in insulator-based multilayer structures. Among several studies focused on the charge transport mechanism (CTM) in insulators, only a few have investigated it in insulating polymers. In this work, we study the leakage current and charge t...
Article
In this paper, we performed steady-state spectroscopy and time-resolved optical spectroscopy (TRS) of conjugated oligomer 1,4-bis(9-ethyl-3-carbazo-vinylene)-9,9-dihexyl-fluorene (BECV-DHF)/perovskite quantum dot (PQD) (CsPbBr3) (LUMAR)] composites in solution. Furthermore, we investigated the lasing properties of the composites under nanosecond la...
Article
Full-text available
Background In this study, a biologically active molecule, di-methyl flubendazole isolated from the extract of Carica papaya leaves confirmed by using GC-MS, ¹H NMR, and ¹³C NMR analysis was applied to synthesize silver nanoparticles (AgNPs). The AgNPs with plant sources an alternative therapeutic agent for synthetic compound used in cancer chemothe...
Article
Full-text available
In this investigation, we have analyzed the structural, electrical, and optical behaviors of pure and composite thin films which are obtained from 2D monolayer molybdenum disulfide (MoS2) flakes, conjugated oligomer (CO) 1,4-Bis(9-ethyl-3-carbazo-vinylene)-9,9-dihexyl-fluorene (BECV-DHF), and by combining CO (BECV-DHF) with MoS2 in forms of CO/MoS2...
Article
Full-text available
The meteorite found in the Empty Quarter of Kingdom of Saudi Arabia (KSA) is the largest meteorite found in the KSA and has the shape of an irregular ellipsoid with semi-axes of 0.65 m, 0.38 m, and 0.27 m; a density of 6400 kg/m³; and a mass of 2550 kg. It is a massive piece belonging to the category of iron–nickel meteorites, which is contained in...
Article
Full-text available
Background The antioxidant potential and antiproliferative activity of the extracts of Nigella sativa seeds (Black Cummins) and honey formulations are to be explored. Method: The Gas chromatography-mass spectrum (GC-MS) and Thin Layer Chromatography (TLC) fingerprint of black Cummins and Honey formulation revealed alkaloid, saponin, volatile oil, f...
Article
Kaempferia galangal L. (Zingiberaceae), also known as aromatic ginger, is used in the food and cosmetics, pharmaceuticals and maquillage materials, as well as in the traditional Indian medicine. The essential oil (EO) obtained from its rhizome by hydrodistillation is of economic interest and contains ethyl p-methoxycinnamate as the main component,...
Article
Full-text available
The current investigation was taken to screen the phytoconstituents present in fruit endocarp various extracts of Nephelium lappaceum commonly called as Rambutan fruit and its anticancer property against human hepatocellular carcinoma (HepG-2) cells. Different analytical techniques including qualitative phytochemical analysis, cell viability assay...
Article
Full-text available
The study focusses on synthesis and modification of structural, optical and electrical characteristics of nano-structured titanium dioxide anatase embedded Poly(methyl methacrylate) (PMMA) nanocomposite with different weight percentages (0.03, 0.06, 0.12, 0.18 and 0.24%) by the solvent casting method. Modification in the morphology of PMMA nanocomp...
Article
Herein, an efficient visible-light-driven BiFeO3/AgVO3 nanocomposite was effectively fabricated via a facile co-precipitation procedure. The physicochemical properties of BiFeO3/AgVO3 nanocomposites were investigated via Fourier transform-infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL), UV visibl...
Article
In this study, we reported the biological approach to synthesis of ZnO nanorod (NR) on the reduced graphene oxide (RGO) for photocatalytic, antibacterial activity and hydrogen production under sunlight. Bacillus subtilis played a vital role in the production of biogenic ammonia from synthetic urine and utilized for the synthesis of ZnONR on the RGO...
Article
Full-text available
Methanolic extract of Artemisia pallens (MEAP) (Asteraceae) was explored as greenbiocorrosion inhibitor for mild steel 1010 in 1.5% sodium chloride environment. Bacillus megaterium SKR7 induces the development of biofilm on the metal surface and forms the pitting corrosion. MEAP was showed (25 ppm) optimum inhibition effect of biocorrosion and furt...
Article
Full-text available
Purpose: To study the cytotoxic evaluation, antimicrobial and confocal analysis of zinc oxide nanoparticles (ZnO NPs) obtained from a novel plant product fennel (Foeniculum vulgare Mill.) seed extract (FSE). Methods: ZnO NPs were analyzed using UV-Vis spectroscopy, XRD, FTIR, TEM and EDX techniques. The MTT cell cytotoxicity assay measured the p...
Article
In this paper, we studied the optical properties, lasing properties, and time-resolved spectroscopy (TRS) dynamics of the energy transfer between the conjugated oligomer (CO) 1,4-bis(9-ethyl-3-carbazo-vinylene)-9,9-dihexyl-fluorene (BECV-DHF) and conjugated-polymer (CP) influencer poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene] (MEH-PPV...
Article
Full-text available
The M. citrifolia, commonly called starvation fruit, plays an essential role in daily dietary intakes, as it contains several vitamins, phytochemicals, and electrolytes. These constituents have several biological activities that are anti-tumor, antibacterial, antiviral, antifungal, and play a role in the immune system. The silver nanoparticles (AgN...
Article
The present study evaluating the coupling between bioremediation (BIO) and electrokinetic (EK) remediation of crude oil hydrocarbon by using bio-electrokinetic (BIO-EK) technique. The application of bacterial biosurfactant (BS) may increase the remediation efficiency by increasing the solubility of organic materials. In this work, the potential bio...
Article
The present study integrated the electrokinetic (EK) with bioremediation (Bioelectrokinetic -BEK) of diesel hydrocarbon by Staphylococcus epidermidis EVR4. It was identified as efficient biosurfactant producing bacteria and growth parameters was optimized using response surface methodology. Upon degradation, there is a complete disappearance of pea...
Article
Full-text available
A Schottky contact is greatly vital for electronic devices; therefore, a quantitative analysis of the Schottky interface is important in realizing a high-performance Schottky diode. In this study, we fabricate an r-GO-based Schottky diode and elucidate the charge traps in r-GO by analyzing the current–voltage characteristics. The conduction becomes...
Article
Full-text available
Two-dimensional (2D) materials have gained prominent attention in the nano-electronics arena, owing to their tunable electronic and optical features. Here, the physical properties of a janus MoSSe monolayer are examined upon the chemically co-doping of S/Se sites by non-metallic and halogen elements (C, Si, N, P, As, and F) employing first-principl...
Article
A plethora of experimental reports and evidences from recent times have collectively taken efforts in developing a novel mirror-less laser. Breakthrough in Conjugated polymer lasers unravel numerous attractive research direction over the last decade. The present study experimentally demonstrated a temperature-activated/controlled amplified spontane...
Article
It has been known for a few decades that laser dye, 7-diethylamino 4-methyl coumarin (DAMC) exhibits one absorption and one fluorescence peak but produces dual amplified spontaneous emission (ASE) bands (at 427 and 460 nm) in certain solvents, under high power pulsed laser pumping. The appearance of the new peak manifested only under high pump ener...
Article
In the present study, the spectral diagnosis of blood plasma samples of breast cancer patients and an equal number of normal controls was investigated. A set of ratio parameters was acquired by employing SXS and FES. The samples were also analyzed statistically by employing Welch two-sample t-tests, and the effects of three ratio parameters, R1, R2...
Article
The synthesis of extremely stable and active earth abundant electrocatalyst is necessary to minimize the reliance on platinum (Pt) for hydrogen evolution reaction (HER) over broad pH medium which is remaining as a great challenge. Among different ordinary metal based electrocatalysts, nickel sulphide-based material has been recognized as active ele...
Article
Full-text available
Purpose: The present study synthesized silver nanoparticles (AgNPs) using the aqueous extract of a traditional medicinal product consisting of an oleoresin (a combination of macromolecules of carbohydrates and proteins) exuded from the rhizome of the plant Ferula foetida (asafoetida gum) and evaluated its biological properties. Materials and meth...
Article
Full-text available
The Editor-in-Chief has retracted this article [1] because Figure 4 and Figure 5 appear to show cobalt oxide nanoparticles and not iron oxide nanoparticles as stated in the article. The data reported in this article are therefore unreliable.
Article
The essential oil (EO) composition of Vetiveria zizanioides and Ocimum basilicum were analysed and its post-harvest protective properties of jack fruits (Artocarpus heterophyllus Lam.) against the spoilage bacteria and fungi were investigated. Hydrodistillation and GC–MS analysis documented the presence of various components, including, hexamethyl-...
Article
Full-text available
Nanobiotechnology is an exuberant sphere of science that exhibits potential application in cancer therapy, targeted chemotherapy, molecular diagnosis and molecular imaging. Present investigation discloses green route synthesis of selenium nanoparticles leading to functionalization as anti leukemia nanomaterial. Emergence of resistance over cancer r...
Article
Full-text available
A carbon aerogel (CA)-assisted CdS nanocomposite was prepared by hydrothermal process and was investigated as a photocatalyst towards the photodegradation of methylene blue (MB) dye and colorless phenol under visible light irradiation (VLI). CdS have attracted wide attention due to their relatively narrow band gap for the visible light effect and t...
Article
Full-text available
Ba2−xSrxZnWO6 double perovskite (DP) oxide compounds (x = 1, 1.25, 1.5, 1.75, 2) were successfully created by means of conventional solid-state techniques. The crystal structures of our series were studied using an X-ray diffractometer. The x = 1 compound has a cubic (Fm-3m) crystal structure, the 1 ≤ x ≤ 2 compounds have tetragonal (I4/m) symmetry...
Article
Hydroxyapatite (HAp) is an important biological molecule and principal mineral component found in bones that is used in various clinical applications to significantly enhance the biological activity and biocompatibility of man-made biological molecule. Several analyses have been performed to control the structural properties of HAp by varying the p...
Article
Full-text available
The photo catalytic degradation, a proven chemical process used for the decontamination of organic/inorganic pollutants and microorganisms in water was implemented. In this work for the selective killing of cervical cancer cells (HeLa cells) by using nano-composite of ZnO (Zinc Oxcide), WO3 (tungsten oxide) and (n-WO3/ZnO) as a photo-catalyst under...
Article
Full-text available
A novel biological approach is attempted to convert the human urinary waste into a well-designed bionanomaterial. In the present study, biological activated ammonia gas (NH3(g)) mediated synthesis of hydroxyapatite material (B-HAp) and then impregnation of silver nanoparticles (AgNPs) on the B-HAp material surface was performed by photoreduction me...
Article
Full-text available
Pristine ZrO 2 and molar ratios of Cu-doped ZrO 2 nanoparticles were synthesized by chemical precipitation. The XRD pattern of pristine ZrO 2 and Cu-doped ZrO 2 nanoparticles shows the formation of t-tetragonal phase and shifting of tetragonal phase to monoclinic phase. The average crystallite sizes of the pristine ZrO 2 and Cu-doped ZrO 2 nanopart...
Article
In this present study, ureolytic bacteria mediated synthesis of hairy shaped ZnO nanostructure was synthesized as a photocatalyst for degradation of dye viz Methylene blue (MB), Methyl orange (MO), Rhodamine-B (Rho-B) and fresh textile effluents. Various analytical techniques were used for characterization of photocatalyst material by measuring the...
Article
Vanadium oxides are promising candidates for cathode materials in aqueous zinc-ion batteries (ZIBs) with low cost and high capacity yet requirements for long cycling necessitate the development of increasingly stable structure. This study reports a structural engineering method by incorporating K⁺ into hydrated vanadium pentoxide (V2O5·nH2O, VOH) t...
Article
Full-text available
Active nanoplasmonics have recently led to the emergence of many promising applications. One of them is the spaser (surface plasmons amplification by stimulated emission of radiation) that has been shown to generate coherent and intense fields of selected surface plasmon modes that are strongly localized in the nanoscale. We propose a novel nanospa...
Article
Full-text available
The ZnO particle with varieties of morphology was prepared from ice-cube of zinc ammonium complex at boiling water surface in 1 min induction of thermal shock. The zinc ammonium complex in ice cube was developed using zinc acetate and biologically activated ammonia in 1 hr and kept in the freezer. Temperature gradient behaviour of the water medium...
Article
Full-text available
Two chromium resistant alkalophilic bacterial strains (CRAB), namely Bacillus cohnii SR2 and Bacillus licheniformis SR3 were isolated and identified from tannery effluent. Bioreduction of chromium (VI) into chromium (III) by CRAB was investigated in the present study. Optimization of process parameters with respect to bioreduction percentage was st...
Article
We report a short investigation of the energy transfer process between the conjugated oligomer 1,4-bis(9-ethyl-3-carbazo-vinylene)-9,9-dihexyl-fluorene (BECV-DHF) and the conjugated polymer poly[2-methoxy-5-(3,7-dimethyloctyloxy)-1,4-phenylene-vinylene] - end capped with DMP (MDMO-PPV). The radiative energy transfer (RET) process shows a time delay...
Article
Full-text available
In this paper, we studied the laser and optical properties of conjugated oligomer (CO) 1,4-bis(9-ethyl-3-carbazo-vinylene)-9,9-dihexyl-fluorene (BECV-DHF) thin films, which were cast onto a quartz substrate using a spin coating technique. BECV-DHF was dissolved in chloroform at different concentrations to produce thin films with various thicknesses...
Article
Zinc oxide nanoparticles (ZnO NPs) and calcium-doped zinc oxide (Ca-ZnO) NPs were produced via co-precipitation assay. Physicochemical properties of synthesized NPs have been studied by X-ray powder diffrac-tion (XRD), Ultraviolet-visible (UV-vis), Photoluminescence (PL), scanning electron microscopy (SEM), Energy Dispersive X-ray (EDAX) with fluor...