Saeed Bastani

Institute for Color Science and Technology | ICST · Department of Surface Coating and Corrosion

Through the sequential absorption of lower energy Near Infrared (NIR) photons, upconversion nanoparticles (UCNPs) can emit higher energy photons. Owing to the great penetration depth of NIR radiation and its non-toxicity, the UCNPs do not possess the main drawbacks of UV/Visible radiation. Moreover, by choosing the proper hosts, dopants, and archit...

Upconversion, the act of fusing many low-energy photons into one higher-energy photon, has progressed in recent years to a growing technique with rising interest in the development of novel luminous materials. Recent developments in sophisticated chemical synthesis of nanomaterials have made it feasible to create a wide range of practical upconvers...

In this study, biodegradable oxidized methacrylated alginate (OMA) hydrogels with controllable mechanical properties were engineered. An ionic and photo cross-linking combination was employed to fabricate dual cross-linked hydrogels. By altering the degree of methacrylation and polymer concentration, hydrogels with an elastic modulus of 4.85 ± 0.13...

Purpose This study aims to investigate the effect of trisodium nitrilotriacetic acid (NTA) on the physical and luminescence emission properties of NaLuF4:Yb, Tm Upconversion (UC) particles and compared with trisodium citrate (CA). Upconversion materials have been remarkably considered in many applications in the past decades. However, the morpholog...

Upconversion materials are capable of emitting high-energy photons in the span of ultraviolet to NIR region of electromagnetic spectrum under excitation by low energy NIR photons through a process termed ‘upconversion fluorescence’. The NIR electromagnetic wave has deeper penetration, lower thermal effect, and lower toxicity compared with UV/vis la...

In this study, biodegradable oxidized methacrylated alginate (OMA) hydrogels with controllable mechanical properties were engineered. An ionic and photo cross-linking combination was employed to fabricate dual cross-linked hydrogels. By altering the degree of methacrylation and polymer concentration, hydrogels with an elastic modulus of 4.85 ± 0.13...

The effects of molecular weight of PDMS on chemorheology and viscoelastic behavior of siloxane modified waterborne UV-curable polyurethane acrylate dispersions (Si-WUPAs) were assessed via a photo rheometer as a versatile tool for in situ observation of chemical and mechanical characteristics during photopolymerization reaction. The roles of PDMS s...

Symmetric diketopyrrolopyrrole derivatives with N,N-diHexyl, N,N-diOctyl, N,N-diDecyl and N,N-diDodecyl alkyl chain were synthesized and characterized. The effects of alkyl chain length, which attached to the central core of diketopyrrolopyrrole were studied on physical properties of the synthesized dyes. Then, in addition to the effects of various...

Silicone-based materials and systems have played a key role over a century. In this work, surface and bulk characteristics of siloxane-modified water-based urethane-acrylate dispersions containing hydrophilic and hydrophobic soft segments with variable molecular weight and also a hard segment were tailored. Feeding and synthesis conditions were cha...

UV-curable composites always suffer from low conversion due to the low penetration depth of photons as a result of absorption of light by fillers. Herein, down-conversion particles were introduced as mineral materials within the composites to observe the alteration in final conversion along with some physical and mechanical properties. FT-IR, DMTA,...

NaLuF4 doped Yb/Tm upconversion phosphor was synthesized by a facile hydrothermal method, using EDTA as a chelating agent. The influence of synthesis parameters was investigated on UV emission intensity through face-centered central composite design (CCD). Four parameters including F:RE ratio, pH value, reaction time and ethanol percent were consid...

The novel fluorescent dyes based on diketopyrrolopyrrole materials were developed as a basic component for use in inkjet ink formulations. N-substituted DPP derivatives of ethyl formate and ethyl acetate (symmetric and asymmetric) were synthesized and characterized. Then, quantum chemical calculations were performed to investigate the observed chan...

Upconversion (UC) microparticles were used as novel internal radiation sources for composite preparation. These particles emit Ultraviolet-Visible radiation when exposed to Near-infrared waves. This radiation causes uniform and deep polymerization. Two types of UC particles were prepared via a facile hydrothermal method, including NaLuF4: Yb 20%, T...

Surface topography and phase-manipulated distribution of hybrid UV curable coatings is performed. Accordingly, phase separation is controlled by changing the inorganic/organic ratio and the photoinitiator content as these are the main thermodynamic and kinetic affecting factors, respectively. Chemical and mechanical evolution of the samples during...

In the present study, a polyurethane acrylate (PUA) system cured via a thermal–UV (dual-cure process) was developed. The system selected for this work was a two-pack polyurethane acrylate with polyester polyol as the main component and urethane monoacrylate (UMA) as hardener. The polyester polyol was synthesized in a way to provide a final film coa...

UV-curable systems based on polyethylene glycol diacrylate (PEG-DA) containing various amounts of scattering silicon nitride nanoparticles were studied by real-time Fourier transform infrared (RT FTIR) and real-time UV–visible (RT UV–visible) spectroscopies. Increasing the percentage of nanoparticles into the UV-curable systems caused the photopoly...

Inventing a new light source for overcoming the disadvantages of conventional radiation curing technology is essential. Upconversion particles capable of emitting photon span from ultraviolet to NIR region of electromagnetic spectrum under excitation of NIR laser, could play the role of a light source within the formulation. Different amount of the...

Inorganic silane oligomer based on tetraethoxysilane was synthesized via sol-gel under acidic condition. UV curable organic-inorganic hybrid coatings were then prepared using the synthesized inorganic oligomers and tetraethylene glycol diacrylate. The effect of organic/inorganic content ratio on gelation and shrinkage of samples was investigated by...

This chapter covers the preparation and properties of ultraviolet (UV)-curable nanocomposite containing carbon nanotubes as fillers. UV-curing technology is of particular interest due to its unique properties such as rapid curing process and solvent-free formulation. Alongside with the advantages of utilizing this curing method, carbon nanotubes un...

A quickly expanding process within the paint and coatings industry is the implementation of ultraviolet (UV) to cure or dry coating on various products (i.e., wood, metal, or plastic). Increasingly used in place of replacing conventional high-heat processing techniques, UV-cured coating produces materials with improved properties, lowers the operat...

Recently, hybrid organic–inorganic nanocomposite UV-cured coatings have received considerable attention. Their attractiveness is due to improvements in various properties, including resistance to scratch, abrasion, heat, radiation as well as other mechanical and electrical properties, while maintaining their transparency and gloss. In this research...

This chapter covers the preparation and properties of ultraviolet (UV)-curable nanocomposite containing carbon nanotubes as fillers. UV-curing technology is of particular interest due to its unique properties such as rapid curing process and solvent-free formulation. Alongside with the advantages of utilizing this curing method, carbon nanotubes un...

Photopolymerization is a rapidly expanding technology because it offers several advantages. For instance, it is solvent-free and energy-efficient and can be used for heat-sensitive substances. Composites are materials consisting of two organic and inorganic compounds collecting the process ability of organic materials as well as hardness and ductil...

Ultraviolet (UV) emissions of hydrothermally synthesized NaYF4: Yb3+, Tm3+ upconversion crystals were optimized using the response surface methodology experimental design. In these experimental designs, 9 runs, two factors namely (1) Tm3+ ion concentration, and (2) pH value were investigated using 3 different ligands. Introducing UV upconversion em...

Abstract Photopolymerization is a rapidly expanding technology because it offers several advantages. For instance, it is solvent-free and energy-efficient and can be used for heat-sensitive substances. Composites are materials consisting of two organic and inorganic compounds collecting the process ability of organic materials as well as hardness...

This study demonstrates the effect of some commonly used silane precursors on curing behavior and photopolymerization kinetics of UV-curable hybrid coatings. Tetraethoxyorthosilane (TEOS), vinyltrimethoxysilane (VTMS), and 3-methacryloxypropyltrimethoxysilane (MPS) were polymerized under acidic conditions by the sol–gel method. The resulting struct...

The photopolymerization of pigmented coatings is a great challenge and hardly investigated in the literature. Therefore, in this work, the effect of photopolymerization temperature and light intensity on the curing behavior of a TiO2-pigmented UV curable epoxy acrylate system was investigated by using photo-differential scanning calorimetry (photo-...

The photopolymerization of pigmented coatings is a great challenge and hardly investigated in the literature. Therefore, in this work, the effect of photopolymerization temperature and light intensity on the curing behavior of a TiO 2 -pigmented UV curable epoxy acrylate system was investigated by using photo-differential scanning calorim-etry (pho...

Abstract Purpose – The purpose of this work was to study the effect of chemical structure of reactive diluents on the curing behaviour and physical– mechanical properties of a titanium dioxide pigmented UV-curable epoxy acrylate system. Design/methodology/approach – Two different tri-functional and two different tetra-functional acrylate monomers w...

Purpose – The purpose of this work was to perform a systematic study on the effect of formulation on the physical and mechanical properties of ultaviolet (UV) curable urethane acrylate resins. In addition, the authors wanted to derive mathematical formula for the prediction of physical and mechanical properties for the aforementioned system. Desig...

Polypropylene (PP) was modified utilizing two types of polyesteramide-based hyperbranched polymers (amphiphilic PS and hydrophilic PH). A maleicanhydride-modified PP (PM) was used as a reactive dispersing agent to enhance the modification by grafting the hyperbranched polymers onto the PP chains. Pure PP, two different non-reactively modified sampl...

Purpose – The purpose of this work was to perform a systematic study on the effect of formulation on the physical and mechanical properties of ultaviolet (UV) curable urethane acrylate resins. In addition, the authors wanted to derive mathematical formula for the prediction of physical and mechanical properties for the aforementioned system. Design...

Purpose – The purpose of this work was to perform a systematic study on the effect of formulation on the physical and mechanical properties of ultaviolet (UV) curable urethane acrylate resins. In addition, the authors wanted to derive mathematical formula for the prediction of physical and mechanical properties for the aforementioned system. Design...

This study was done to assess the curing behavior of UV-curable coatings containing the multifunctional acrylate monomers, 1,6-hexanediol diacrylate (HDDA), trimethylolpropane triacrylate (TMPTA), and dipentaerythritol pentaacrylate (DiPEPA). Functionalized nanosilica was used for nano-based coating preparations. A microtome was used to cut each co...

This work aims at investigating the dispersibility of a modified hydrophilic nanosilica using methacryloxy propyltrimethoxysilane (MPTMS) in an organic phase, which contains UV-curable urethane acrylate oligomers and monomers with different functionalities. Through a Taguchi design of experiment, the impacts of influencing parameters such as silane...

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Incorporation of fluorinated multiwalled carbon nanotubes (MWCNTs) into poly(dimethylsiloxane) (PDMS) was studied as an alternative method to improve the surface properties of the latter. The surface properties of PDMS matrixes filled with fluorinated MWCNTs were investigated and compared to those of pristine MWCNT/PDMS composites. Contact angle me...

In this paper, the effects of structural and process variables on wear resistance of silicone rubber/carbon black coatings on 6061 aluminum alloy surfaces are studied. Testing parameters have been optimized for maximum wear resistance based on taguchi orthogonal design with six important parameters, viz. polydimethylsiloxane (PDMS) molecular weight...

The synergistic effect of nano titanium dioxide (10 and 30 nm) and nano silver (10 nm) as antibacterial agents were investigated on UV curable clear coating. Antibacterial and physical–mechanical properties of coating were optimized using experimental design in response surface method. Twenty different samples of nano Ag and nano TiO2 were prepared...

The characterisation of poly(dimethylsiloxane) (PDMS)-based fouling-release coatings filled with pristine and fluorinated multiwalled carbon nanotubes (MWCNTs) are reported. The fluorination of MWCNTs was performed via a three-step procedure, which consisted of oxidation in an acid mixture, reduction by diisobutylaluminium hydride and silanisation...

Polypropylene (PP) is modified utilizing a poly(ester amide)-based hyperbranched polymer (PS). A maleic-modified PP is used to enhance the compatibility. Usual tensile experiments are carried out. The nanocrystalline structure is studied using small-angle X-ray scattering (SAXS) while a uniaxial mechanical load is simultaneously applied. SAXS patte...

Fiber-graded poly(propylene) was modified by polyester-amide-based dendritic nanostructures with the aim of improving its dyeability. Two different dendritic polymers were used and the dendritic nanostructures were formed in situ via reactive blending with maleic anhydride-modified poly(propylene). Samples were chosen exploiting a 4-component mixtu...

Black thermal control coatings based on carbon black are used widely in space technology. The thermal control coatings are exposed to electrostatic charges that develop on the external surface of the spacecraft. The charges would otherwise accumulate to cause arcing and possible damage. The carbon black pigment provides sufficient electrical conduc...

To achieve a stable blend of a bisphenol A type epoxy resin and poly(dimethylsiloxane) (PDMS), reac-tion between hydroxyl (OH) groups of the epoxy and silanol groups of hydroxyl-terminated(HT) PDMS has been investi-gated. The chemical structures of the HTPDMS-modified epoxies were characterized by Fourier transform infrared (FTIR) and 1 H-and 13 C-...

This work aims at studying the abrasion resistance of differently formulated organic–inorganic hybrid coatings prepared by sol–gel method. The organic phase contained UV curable urethane acrylate oligomers and monomers having different functionalities. The inorganic phase was composed of tetraethyl orthosilicate (TEOS) and 3-methacryloxy propyltrim...

Epoxy-amine adduct was prepared by reaction between DGEBA and 1,1-iminodi-2-propanol. The kinetic of the reaction was investigated by differential scanning calorimetry (DSC) and a model-free approach. The epoxy-amine adducts were prepared with various molar ratios of amine functionalities. Waterborne dispersions of these resins have been prepared b...

An epoxy acrylate resin was synthesized and the resin was used along with different multifunctional acrylate monomers, i.e. trimethylol propane triacrylate (TMPTA), tripropylene glycol diacrylate (TPGDA), 1,6-hexanedioldiacrylate (HDDA). The effect of the chemical structure of the monomers on some of the physical–mechanical properties of the resins...

In this research, an epoxy acrylate resin was synthesized, and then the resin was used along with different multifunctional acrylate monomers and cured under UV radiation. To investigate the effect of nano-particles on some of the physical and mechanical properties, i.e. scratch, hardness and gloss, of the UV cured resins, a suspension of nano-alum...

In spite of obvious advantages of radiation curable powder coatings some of their physical and mechanical properties such as impact resistance, flexibility, hardness and tensile strength are poorer than thermally curable powder coatings. It is believed that UV-curable powder coatings containing interpenetrating polymer networks (IPNs) inherently ha...

The main purpose of this research is formulating and optimizing a new road-marking paint which is an environmentally friendly product. This paint is produced with an emulsion of an acrylic copolymer and contains the least of the volatile organic compounds. The formulation and optimization procedure is carried out on the base of experimental design...

In this Paper, At first Pigment Red 3 was synthesized and then treated chemically. The treated pigment showed very good dispersibility and dispersion stability in aqueous media, surface chemistry and shape of the pigment were affected by chemical treatments. A Sulfonating agent was used to treat the pigment surface. The chemical reaction was taken...

The effects of Atomic oxygen on various materials have been widely investigated in recent years by in-flight and laboratory simulation experiments. The interaction of atomic oxygen with materials may result in surface erosion, changes in chemical composition and surface morphology, changes in optical properties, and formation of particulate and mol...

In this research, a lithography ink formulation based on the Maleic and Alkyd resin has been prepared and its rheological parameters such as viscosity vs. shear rate, thixotropy cycle, storage and loss modules and dynamic viscosity were studied. It was observed that viscosity values augmented severely by increasing the pigments concentration and re...

Poster