Ebrahim Ghasemi

Institute for Color Science and Technology | ICST · Department of Inorganic Pigments and Glaze

A newly developed bio-hybrid material comprising luteolin as a bioactive dye and a Zinc-Aluminum layered double hydroxide as an adsorbent was synthesized using two distinct methods. In the first method, Zinc-Aluminum layered double hydroxide was initially produced using the co-precipitation technique. Subsequently, the bioactive luteolin was interc...

In this research, sol-gel bioactive glass in SiO2 - P2O5 – CaO - Na2O system using common nitrate precursors was investigated. Some parameters like water/alcohol/TEOS ratio, type of catalyst (acid or alkali) and temperature of heat treatment were also studied. Various precursors such as acetates, carbonates and chlorides were utilized to introduce...

Two novel perylene-based acid dyes were synthesized to produce fluorescent polyamide fabrics. The dyes were made by reacting perylene-3,4,9,10-tetracarboxylic acid dianhydride (PTCA) with sulfanilic acid and 1-amino-8-hydroxy-3,6-naphthalene disulfonic acid (H-acid) in imidazole as a solvent. FTIR, 1HNMR, UV–Vis, elemental analysis, and spectro-lum...

Layered double hydroxide (LDH) nanoparticles (NPs) have potential applications for the loading and controlled release of drugs. This study investigated the synthesis of Zn/Al-LDH using the co-precipitation and ion-exchange methods, coating with SiO2 NPs and precise control of the release of vitamin C (VC). The results showed that more VC could be l...

Layered double hydroxide (LDH) nanoparticles (NPs) have potential applications for the loading and controlled release of drugs. This study investigated the synthesis of Zn/Al-LDH using the co-precipitation and ion-exchange methods, coating with SiO2 NPs and precise control of the release of vitamin C (VC). The results showed that more VC could be l...

Layered double hydroxide (LDH) nanoparticles (NPs) have potential applications for the loading and controlled release of drugs. This study investigated the synthesis of Zn/Al-LDH using the co-precipitation and ion-exchange methods, coating with SiO2 NPs and precise control of the release of vitamin C (VC). The results showed that more VC could be l...

A series of ferrite spinel nanopigments doped with various elements were synthesized via a surfactant-assisted solvothermal method. Then, they were modified with 3-amino propyl trimethoxy silane (APTMS) and characterized by X-ray diffraction (XRD) analysis, thermal gravimetric analysis (TGA), Fourier transform infrared (FT-IR) spectroscopy and ener...

In many wastewater treatment processes, the discovery of cost-effective electrocatalysts is very important for photoelectrocatalytic reactions. This paper reports a suitable method for the synthesis of high efficiency hybrid photoelectrocatalyst consisting of NiCo layered double hydroxide and CdS, called [email protected] 3-D [email protected] elec...

Simvastatin (SIM) has introduced as a stimulator for bone generation recently. Its controlled delivery rate is determinant for this purpose. In this work Layered double hydroxide (LDH)-based drug delivery systems are introduced for SIM drug for the first time. It was loaded into a series of ZnAl-NO 3 (CO 3) LDHs using two different synthesis proces...

Layered double hydroxide (LDH) nanoparticles (NPs) have potential applications for the loading and controlled release of drugs. This study investigated the synthesis of Zn/Al-LDH using the co-precipitation and ion-exchange methods, coating with SiO2 NPs and precise control of the release of vitamin C (VC). The results showed that more VC could be l...

In the present study, the influence of the crystalline structure of Fe2O3(amorphous) @TiO2, α-Fe2O3@TiO2 and α-Fe2O3 @SiO2 @TiO2 nanocomposites on the NIR-reflectance and photocatalytic properties have been investigated. The nano-sized α-Fe2O3, SiO2 and TiO2 were prepared via co-precipitation, Stober and sol-gel methods, respectively. The photocata...

Layered Double Hydroxides (LDHs) are well-known nanomaterials for the construction of self-healing corrosion protective composite coatings with controlled release ability of the active corrosion inhibitors. In this paper, the LDH surface has been modified with SiO2 nanoparticles through a sol-gel method, and then its active corrosion inhibition beh...

This paper reports a novel approach for the synthesis of MgAl-LDH, [email protected]2, CoAl2O4, and [email protected]2@CoAl2O4 in order to make a hybrid pigment. SEM, TEM, XRD, Raman spectroscopy, elemental mapping, TG/DTG, optical microscopy, UV–vis-NIR spectrophotometry, and CIE 1976 L*a*b* color coordinates were used to characterize the synthesi...

This paper is a report on the development of a convenient approach to fabricating a very efficient hybrid photoelectrocatalyst for water splitting. This photoelectrocatalyst consists of nickel-cobalt layered double hydroxide as the core, cadmium sulfide as the shell, and nitrogen, hence [email protected] For the electrocatalytic activity to be impr...

For the first time, Feldspar (F) nanocontainer, which is a group of rock-forming tectosilicate minerals with the chemical composition of KAlSi3O8-NaAlSi3O8-CaAl2Si2O8, was used for the construction of an epoxy composite coating with superior barrier and self-healing anti-corrosion performance. Feldspar (F) based nanocontainer with robust corrosion...

In this study, for the first time, the corrosion mitigation ability of zinc intercalated kaolin (K) as an inorganic and cost-effective nanocontainer was studied. The impact of kaolin modification by zinc ions on the epoxy ester coating corrosion protection ability was surveyed by EIS (Electrochemical impedance spectroscopy) and salt spray tests. XR...

In this paper, ZnAl layered double hydroxide particles surface were decorated with SiO2 nanoparticles to investigate the influence of SiO2 nanoparticles presence on molybdate anion loading and release behavior as a corrosion inhibitor. For this purpose, we have synthesis a carbonate-based layered double hydroxide (LDH). Nano SiO2 particles were use...

Layered double hydroxide (LDH) nanoparticles are utilized as nanocontainers for reserving corrosion inhibitors in order to construct a controlled release system with targeted delivery of inhibitive compounds on the corrosion sites of metal. In this way, the NO3- intercalated Zn-Al LDH nanoparticles were synthesized through the co-precipitation rout...

In the present study, a dual functional nanostructured Fe2O3@TiO2 pigment, known as a cool pigment, is presented owning photocatalytic properties and NIR reflection. The Fe2O3@TiO2 nano pigments were prepared with different proportions of Fe2O3/TiO2 at 0.06, 0.62 and 1.24. Fe³⁺ precursors were used to producing Fe2O3 nanoparticles via co-precipitat...

Herein, we demonstrated a facile non-covalent functionalization route to exploit the GO sheets as an efficient carrier for high loading of Zn (II) corrosion inhibitor with the controllable slow release. The Zn (II) intercalated GO exhibited good compatibility with epoxy matrix stemming from the chemical and structural alterations as confirmed by Ra...

Alumina‐based ceramic cores have widespread applications especially in the investment casting of turbine blades due to chemical inertness with most of the superalloys, capability of machining in the green state, and their mechanical stability at high temperatures. The present work studied the effects of TiO2 addition to the alumina‐based cores. The...

Layered double hydroxide (LDH) nanoparticles (NPs) have potential applications for the loading and controlled release of drugs. This study investigated the synthesis of Zn/Al-LDH using the co-precipitation and ion-exchange methods, coating with SiO2 NPs and precise control of the release of vitamin C (VC). The results showed that more VC could be l...

The use of cool pigments is considered to be a proper strategy to reduce energy consumption in buildings. In the present research, cool pigment nanocomposites based on Fe, Cr and Ti oxides were synthesized as two different composites namely (Fe,Cr)2O3@TiO2 core-shell and physically mixed oxides ones. The NIR reflectance behavior of pigments was exa...

The aim of this study is to construct a highly effective corrosion resistant epoxy coating with excellent self-repair and active corrosion inhibition properties. For this goal, the graphene oxide (GO) nanosheets were non-covalently functionalized with 1H-Benzimidazole (BIM) molecules. The morphology and chemistry of GO-BIM composite were investigat...

Recently, simvastatin (SIM) has been introduced as a stimulator for bone generation. Its controlled delivery rate is determinant for this purpose. In this work, layered double hydroxide (LDH) based drug delivery systems are introduced for SIM drug for the first time. It was loaded into a series of ZnAl-NO3(CO3) LDHs using two different synthesis pr...

Designing durable and highly active photoelectrocatalysts for overall water splitting is very challenging. Here, we report an easy method for synthesizing a highly efficient three-dimensional core-shell photoelectrocatalyst. This catalyst consists of cadmium sulfide as the core and nickel-cobalt layered double hydroxide as the shell, thus [email pr...

The adsorption mechanisms and kinetics of zinc cations at the graphene oxide (GO) nanosheets-water interface were studied by experimental and theoretical approaches. Results showed that adsorption of zinc cations onto GO surface forms a monolayer and obeys Langmuir isotherm. Meanwhile, the kinetics of sorption best fits with the pseudo-second-order...

In this paper, environmentally friendly layered double hydroxide nanoparticles/silane hybrid nanocomposite coatings were fabricated on mild steel substrate. Zinc–aluminum layered double hydroxides (Zn–Al LDHs) pillared with different anions (nitrate, molybedate and phosphate) were synthesized and characterized by X-ray diffraction (XRD). Various LD...

Mg-Al-PO43− layered double hydroxide (LDH) nanoparticle was synthesized through an anion exchange method and characterized by XRD, IR spectroscopy and SEM. The phosphate and Mg2+ release ability of Mg-Al-PO43− LDH in the 3.5 wt. % NaCl solution was measured by inductively coupled plasma-optical emission spectrometer (ICP-OES). Results showed the re...

This study aims at synthesis and characterization of Zn-Al-PO4³⁻ and Zn-Al-NO3⁻ layered double hydroxides (LDHs) through employing FE-SEM, EDS and X-ray photoelectron spectroscopy (XPS) analyses. The smart release ability of the inhibitive spices from LDHs were checked by EIS, polarization and surface analysis tests in 3.5 wt.% NaCl solution. A two...

A novel potassium zinc phosphate (PZP) pigment was synthesized in the presence of benzotriazole (BTA) as a fourth generation of zinc phosphate (ZP). The corrosion inhibition properties of PZP-BTA, compared to PZP and ZP, were investigated by electrochemical techniques in the extract solutions. The chemical composition of the carbon steel surface im...

Composite pastes composed of various amounts of melt-derived bioactive glass 52S4 (MG5) and polycaprolactone (PCL) microspheres in sodium alginate solution were prepared. Rheological properties in both rotatory and oscillatory modes were evaluated. Injectability was measured as injection force versus piston displacement. In vitro calcium phosphate...

Zn-Al-NO3ˉ layered double hydroxide (LDH) nanocontainers loaded with PO43- anion with capability of releasing inhibitive species and absorbing corrosive chloride ions were successfully synthesized by an anion exchange route. The prepared nitrate based LDHs were well characterized by scanning electron microscopy, X-ray diffraction analysis, Fourier...

Magnetite iron oxide base nanopigments (Fe3O4) with two morphologies and different surface treatments were synthesized. Fe3O4 nanopigments were synthesized in the presence and absence of triethanolamine as surfactant and then were modified with 3-amino propyl trimethoxy silane (APTMS). Nanopigments were characterized by X-ray diffraction (XRD) anal...

A series of ferrite spinel nanopigments doped with various elements were synthesized via a surfactant-assisted solvothermal method. Then, they were modified with 3-amino propyl trimethoxy silane (APTMS) and characterized by X-ray diffraction (XRD) analysis, thermal gravimetric analysis (TGA) and energy dispersive X-ray spectroscopy (EDS). The unmod...

A novel potassium zinc phosphate (PZP) pigment was synthesized in the presence of benzotriazole (BTA) by a co-precipitation method. The chemical composition of the pigment was investigated by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermal gravimetric analysis and scanning electron microscope. The inhibitive perfo...

Iron oxide nanoparticles with fiber-like and polygon morphologies were synthesized in the presence of triethanolamine and urea surfactants. The synthesized particles were then treated by 3-amino propyl trimethoxy silane (APTMS). Then, the nanocomposites were prepared through incorporation of 1 wt.% unmodified and surface modified nanopigments into...

Zn-Al layered double hydroxide (LDH) nanoparticles with carbonate as the charge balancing anion in the interlayer space were synthesized using co-precipitation method. Then, the carbonate base Zn-Al LDH nanoparticles were doped with phosphate ion via anion-exchange reaction to synthesize Zn-Al-[PO4³⁻]-[CO3²⁻]. The structure and composition were cha...

Polyisocyanate-functionalized graphene oxide (PI-GO) was synthesized at various functionalization reaction times of 24, 48 and 72 h. The modified GO sheets were characterized by X-ray photo electron spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, thermal gravimetric analysis, and atomic force microscope. It was shown that...

In this work, the Fe3O4 nanoparticles were synthesized via co-precipitation method and their dispersion properties were investigated using three types of anionic poly (ethylene glycol)-graft-acrylic comb dispersants (APADs). The Fe3O4 nanoparticles have been characterized with powder X-ray diffraction, transmission electron microscopy, and dynamic...

The effect of Ni nanoparticles concentration on the rheological and magneto-rheological properties of Ni ferrofluid (FF) in liquid paraffin base were investigated. The FFs were prepared using a high energy milling. A high-energy mill was used to prepare these Ni based ferrofluids. By measuring the peak broadening of the (111) crystal plane for Ni f...

This study investigates the effects of micro- and nano-sized SiC powder on the rheological behavior of Al based feedstocks for powder injection molding (PIM). Different compositions of Al feedstocks with additions of micro and nano-SiC powder were prepared and their rheological properties were measured with a rotational rheometer. The effects of Si...

Chemical treatment of the metal substrates prior coating application is an effective way of improving the adhesion and corrosion protection properties of the organic coatings. Conversion coatings i.e. chromate and phosphate have been widely used for this purpose and improved the organic coating adhesion and corrosion protection properties significa...

The MnAl2O4 and CoAl2O4 nanopigments were synthesized through solution combustion method. The nanopigments extracts in the 3.5 wt% NaCl solution were prepared. Electrochemical impedance spectroscopy (EIS) and linear polarization (LP) techniques were utilized to investigate the corrosion inhibition properties of the pigments in the solutions contain...

Potassium zinc phosphate (PZP) pigments were synthesized using different mole ratios of KOH/ZnCl2, i.e. 1.5, 2, 2.5, 3, 3.5 and 4. The inhibition effects of the pigments were studied in the extract solution by polarization test and electrochemical impedance spectroscopy (EIS). The surface morphology was studied by scanning electron microscope (SEM)...

Abstract An organic/inorganic hybrid corrosion inhibitive pigment based on zinc acetate/benzotriazole was synthesized. The chemical composition of the pigment was investigated by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. In addition, the morphology of the pigment was studied by scanning electron microscopy. The p...

Aluminosilicate compounds such as zeolite and kaolin and their coatings can be useful as a support of sensors and absorbers. In this study, electrophoretic deposition (EPD) of four types of kaolin has been reported. Various types of kaolin differ from each other in Al/(Al + Si) ratio, mineral compositions, surface charge and size of kaolinite flake...

Surface modification of graphene oxide (GO) has been performed by grafting of polyisocyanate (PI) resin. Results obtained from X-ray photo electron spectroscopy, thermal gravimetric analysis and X-ray diffraction analysis revealed that the PI resin chains were successfully attached onto the surface of GO nanosheets through covalent bonding with hyd...

Different types of potassium zinc phosphate (PZP) pigments were synthesized by a co-precipitation method. The PZPs were obtained through changing KOH:ZnCl2 mole ratio. The chemical composition of the pigments was studied by X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy (SEM). Then, the extracts of the P...

The objective of this study is to develop and characterize the active protection properties of the benzimidazole (BIA) and zinc cations (Zn2+) intercalated sodium montmorillonite clay particles in an epoxy ester coating. The corrosion protection properties of the samples were studied by an electrochemical impedance spectroscopy (EIS). Results obtai...

In this study, melt-derived bioactive glass powder was mixed with different concentration of sodium alginate solution to prepare injectable pastes. Injectability of the pastes was investigated using needles with different tip diameter. Rheological measurements were performed both in rotatory and oscillatory modes. Washout resistance was evaluated t...

In this study, melt-derived bioactive glass powder was mixed with different concentration of sodium alginate solution to prepare injectable pastes. Injectability of the pastes was investigated using needles with different tip diameter. Rheological measurements were performed both in rotatory and oscillatory modes. Washout resistance was evaluated t...

Potassium zinc phosphate pigment was synthesized through a co-precipitation method. Then, the steel panels were immersed in 3.5% NaCl solution containing potassium zinc phosphate pigment extract and in the blank 3.5% NaCl solution (containing no pigment) at different immersion times. X-ray diffraction and scanning electron microscope were employed...

In this paper, the influence of sol–gel surface modification of lithium zinc phosphate (LZP) pigment by methacryloxy propyl trimethoxy silane on corrosion inhibition, dispersion stability and adhesion strengthwas studied. IR spectroscopy and thermogravimetric analysis confirmed that organic functional group was successfully grafted onto the LZP sur...

A sodium zinc phosphate pigment synthesized using a co-precipitation method and characterized by X-ray diffraction was investigated for its corrosion inhibition activity in comparison with the commercial zinc phosphate using EIS in a 3.5% NaCl solution. A mild steel surface analysis after exposure to the test solutions was conducted using scanning...

This study aims to prepare optimal feedstock for fabrication of Al/SiC nanocomposites by the low-pressure injection molding technique. For this purpose, micron-sized aluminum and nanosized SiC powders were mixed with different amounts of the binder consisting of 89 wt% paraffin wax, 9 wt% bees wax, and 2 wt% stearic acid. Rheometry analyses as well...

Toner is a main component of electrophotographic printing and copying processes. One of the most important ingredients of toner is magnetite (Fe3O4) which provides the tribocharging property for toner particles. In this study, nano- and microparticles of Fe3O4 were synthesized using the coprecipitation method and different amounts of lauric acid as...

In this research, the effect of milling time and carbon sources was investigated on the β-SiC nanofiber formation via the carbothermal process. Carbon black and petroleum coke were used as carbon sources. They were mixed with microsilica separately; milled for different periods of time and fired at 1450 oC. Phase formation and microstructure of sam...

In powder injection molding process, the rheological properties of feedstocks significantly influences the steady flow and the uniform filling into the mold. In this study, we investigated the effect of micro and nano size particles of Al2O3 on the rheological properties of Mg-Al2O3 feedstocks. A binder system containing Paraffin wax, Bees wax, and...

In recent years, corrosion protection of the steel structures by organic coatings has led to a lot of cost payment. Organic coatings due to their barrier properties against corrosion species access to the steel surface can protect the steel against corrosion. However, the corrosive electrolyte diffusion into the coating matrix through porosities...

In the present work, alpha alumina nanopowder was synthesized via a sol–gel route. After preparation of bohemite (AlOOH) sol, carbon black was added and the resultant sol was dried and calcined in microwave furnace for 10 min. XRD results showed that alpha alumina was the only crystalline phase with specific surface area, mean diameter and crystall...

The synthesis condition of potassium zinc phosphate pigment was optimized with respect to corrosion inhibition in extract solution and dispersion stability in an epoxy resin by application of Taguchi experimental design. Processing parameters, including calcinations time, quiescent time, mixing rate and KOH/ZnCl2 mole ratio are selected as the infl...

The lithopone pigment nanoparticles were synthesized by the reverse microemulsion rout. The N, N-bis-(2-hydroxy ethyl) oleamide (NHEO) surfactant /n-hexanol/ water microemulsion system was used to produce white precipitate. The product was characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, transmission electron microscopy, si...

A series of ferrofluids were made using oleic acid-capped Co3O4 (cobalt oxide) nanoparticles in liquid paraffin by a high-energy milling/sonication method. The average physical size of the dry Co3O4 nanoparticles was determined to be 21 nm by measuring the peak broadening of the (311) crystal plane from X-ray diffraction data of the nanopowder. The...

In this work, the ferrimagnetic nickel-zinc ferrite nanopowder was synthesized via citrate-ethylene glycol processing, followed by the preparation of the epoxy-based nanocomposite. The materials were characterized using X-ray diffraction (XRD), simultaneous thermal analysis (STA), alternative gradient force magnetometer (AGFM), scanning electron mi...

In this article, the effect of potassium on the phase formation and anticorrosion properties of zinc phosphate pigments has been investigated. The co-precipitation method was selected as synthesis method of potassium zinc phosphate pigment. Then the synthesized pigment was characterized by xray diffraction (XRD), Fourier transform infrared (FTIR) a...

An iron oxide ferrofluid with mean particle size of 10.6 nm was synthesized by co-precipitation. The nanoparticles were characterized using X-ray diffraction, transmission electron microscopy, electron energy loss spectroscopy, and dynamic light scattering. The magnetorheological properties of ferrofluid were investigated using a rotating rheometer...

A stable γ-Fe2O3 paraffin-based ferrofluid was prepared via high energy milling. The magnetic particles were characterized using X-ray diffraction, dynamic light scattering and vibrating sample magnetometer techniques. The rheological properties of the ferrofluid were studied using a standard rotating rheometer. The magnetoviscous effect and thixot...

As the ferrofluids are synthesized in a controlled atmosphere to Prevent oxidation of the magnetite phase; most reports of rheological properties have been derived from magnetite based ferrofluids. In this paper a ferrofluid based on iron oxide was synthesized by co-precipitation with air. Lauric acid was used to coat magnetic nanoparticles in the...

A ferrofluid (FF) was synthesized in air using a co-precipitation method. Some rheological properties and magnetoviscous effects of this sample were studied. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used for characterization of the solid particles, and the rheological properties were investigated with a special rheome...

Mullite–zirconia composite materials were prepared by reaction sintering of α-alumina and aluminium nitrate as alumina sources, and zircon powder. Different effects were observed on sintering, densification and microstructure of composites prepared by various alumina sources by adding TiO2. The formation temperature and retention of tetragonal zirc...