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Journal of Coatings Technology and Research
Journal Prestige (SJR): 0.415
Citation Impact (citeScore): 2
Number of Followers: 5  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1547-0091 - ISSN (Online) 1935-3804
Published by Springer-Verlag Homepage  [2348 journals]
  • Porosity measurements in suspension plasma sprayed YSZ coatings using NMR
           cryoporometry and X-ray microscopy
    • Authors: Uta Klement; Johanna Ekberg; Simone Creci; Stephen T. Kelly
      Pages: 753 - 757
      Abstract: Abstract A large variety of coatings are used to protect structural engineering materials from corrosion, wear, and erosion, and to provide thermal insulation. In this work, yttria-stabilized zirconia coatings produced by suspension plasma spraying were investigated with respect to their microstructure and especially their porosity, as the porosity affects the thermal insulation of the underlying component. To determine porosity, pore size distribution, and pore shape, the coatings were investigated using novel advanced characterization techniques like NMR cryoporometry and X-ray microscopy. In general, the porosity is inhomogeneously distributed and the coatings showed a large variety of pore sizes ranging from a few nanometers to micrometers.
      PubDate: 2018-07-01
      DOI: 10.1007/s11998-018-0053-8
      Issue No: Vol. 15, No. 4 (2018)
  • Water affinity guided tunable superhydrophobicity and optimized
           wettability of selected natural minerals
    • Authors: Hande Alptekin; Emre Arkan; Cebrail Özbek; Mustafa Can; Amir Farzaneh; Mücahit Sütçü; Salih Okur; Andrew J. Cobley
      Abstract: Abstract We present a feasible methodology to prepare nonwetting surfaces from natural minerals. Various ranges of silanes were used for the surface grafting, and the best customization was achieved by monochlorosilane. Water affinity analysis of surface functionalized diatomaceous earth was the key aspect of loading tunable wettability on the particle surface. Covalent attachment was confirmed via X-ray photoelectron spectroscopy (XPS), while thermogravimetric analysis, nitrogen adsorption isotherms, and contact angle measurements were used for the evaluation of grafting density and other fundamental features of hydrophobic particles. Diatomaceous earth was chosen as a prototype to develop an efficient strategy for surface modification which can be apposite to another natural particle, the so-called talc, which represents dichotomic performance to water. The present study paves the way for a new approach that can be employed to any proper inherent texture for the production of superhydrophobic powders.
      PubDate: 2018-08-14
      DOI: 10.1007/s11998-018-0115-y
  • Stimuli-responsive polyurethane-urea polymer for protective coatings and
           dampening material
    • Authors: Anastassija Wittmer; Andreas Brinkmann; Volkmar Stenzel; Katharina Koschek
      Abstract: Abstract Intrinsic self-healing coatings have been drawing more and more attention over recent years. A self-healing coating that is able to maintain its original appearance and performance after damage is attractive for a huge scope of applications. This article reports the synthesis of a polyurethane-urea coating with 1-(2-aminoethyl)-imidazolidin-2-one (UDETA) units showing temperature- and moisture-triggered self-healing. Calorimetric and spectroscopic analyses give insight into the self-healing mechanism showing that the absorbed water is able to disturb inter- and intramolecular hydrogen bonds of the polymer chains and decrease the glass transition temperature of the polymer. Temperature-mediated self-healing can be performed from 80 up to 200°C. Aside from self-healing, the molecular dynamics in the polyurethane-urea polymer prove to be beneficial for damping applications as confirmed by dynamic mechanical analysis. Thus, the polymer system features properties that are useful for two different applications, namely in coatings with self-healing and corrosion protective properties and in dampening materials.
      PubDate: 2018-08-10
      DOI: 10.1007/s11998-018-0114-z
  • Synthesis and properties of UV-curable cardanol-based acrylate oligomers
           with cyclotriphosphazene core
    • Authors: Yan Yuan; Miao Chen; Qiaohua Zhou; Ren Liu
      Abstract: Abstract Multiarm cardanol-based oligomers with a cyclotriphosphazene core were prepared through a nucleophilic substitution reaction; the structures of oligomers were fully characterized and confirmed through Fourier transfer infrared spectrometry, 1H nuclear magnetic resonance (NMR), 31P NMR, and gel permeation chromatography. The designed multiarm bio-based acrylates (AECC) were successfully prepared by epoxidizing the unsaturated aliphatic chain of cardanol segments with m-chloroperoxybenzoic acid and acrylating epoxy groups. The synthesized oligomers contain rigid phosphazene/benzene rings as “hard cores” and long aliphatic chains as “flexible shells.” Compared with commercial hyperbranched polyurethane acrylate (CN2302) and acrylated epoxidized soybean oil, cured AECC coatings and films exhibited not only greater hardness, excellent adhesion, higher glass transition temperatures, and excellent mechanical properties but also good thermal stability and biodegradability. We successfully obtained a high-performance UV-curing resin that has a high biorenewable material content and can meet basic daily requirements.
      PubDate: 2018-08-08
      DOI: 10.1007/s11998-018-0112-1
  • POSS functionalized with mixed fluoroalkyl and methacryloxy substituents
           as modifiers for UV-curable coatings
    • Authors: Agnieszka Marcinkowska; Dawid Prządka; Ewa Andrzejewska
      Abstract: Abstract UV-curable acrylate-based coatings were modified by copolymerization of base resins with polyhedral oligomeric silsesquioxanes (POSS) containing four methacryloxy and four fluoroalkyl substituents in one molecule (4M4F-POSS), giving hybrid organic–inorganic coatings. Such modifiers are covalently linked to the matrix (by methacryloxy groups) preventing them from exuding onto the surface, and fluoroalkyl substituents (along with the POSS cages) improve scratch resistance and hydrophobicity. Two types of POSS derivatives differing with the length of the fluoroalkyl chain were tested. These compounds were applied in two types of formulations: wood-derived and aluminum substrates. Modification of the coatings led to a substantial increase in the hydrophobicity and enhanced scratch resistance after incorporation of only 1.5 wt% of the modifier. Water contact angle increased by up to 14–160% of the initial value, whereas the scratch hardness for the first surface stripping improved by about 30–170% in the presence of 5 wt% of POSS. The latter can be associated with the increase in the surface sliding properties caused by the presence of fluoroalkyl substituents of the modifier. Better results were obtained for POSS containing shorter fluoroalkyl substituents.
      PubDate: 2018-08-08
      DOI: 10.1007/s11998-018-0111-2
  • Preparation and properties of hybrid epoxy/hydro-terminated
           polybutadiene/modified MMT nanocomposites
    • Authors: Hongling Yi; Ting Wei; Heng Lin; Junjie Zhou
      Abstract: Abstract The effects of hydroxyl-terminated polybutadiene (HTPB) number average molecular weight ( \( \overline{{\boldsymbol{M\fancyscript{n}}}} \) ) and preparation temperature on montmorillonite (MMT) intercalation/exfoliation behavior were investigated. X-ray diffraction and Fourier transform infrared spectroscopy results indicated that 40 to 80°C were the preferred temperatures to obtain nanostructured HTPB/MMT. The higher \( \overline{{\boldsymbol{M\fancyscript{n}}}} \) (> 2800) of HTPB led to a more exfoliated nanostructure than lower \( \overline{{\boldsymbol{M\fancyscript{n}}}} \) as proven by transmission electron microscopy. The tensile strength, tensile modulus, and elongation at break of nanostructured HTPB/MMT/EP ternary composites were higher than those of the HTPB/EP binary blend, which was due to the HTPB/MMT hybrid structure. The effect of increasing molecular weight on impact strength in the ternary system was less than that in the binary system. The HTPB/MMT/epoxy hybrid composites with low concentration could improve the impact strength, which was due to the superposition effect of organic/inorganic nanostructures. In hybrid HTPB/MMT/epoxy composite system, the toughening was attributed to the slow crack growth and fast crack growth, and the dissipated energy of pulling or debonding nanoclay out from the matrix also contributed.
      PubDate: 2018-08-03
      DOI: 10.1007/s11998-018-0093-0
  • How rheological properties affect fine-line screen printing of pastes: a
           combined rheological and high-speed video imaging study
    • Authors: Chenhui Xu; Norbert Willenbacher
      Abstract: Abstract Fine-line screen printing is still a great challenge due to the lack of overall understanding between the rheological properties and screen printing process. Here, we prepared ZnO pastes including ethyl cellulose or Thixatrol Max as an additive introducing different physical mechanisms of structure and flow control. Yield stress, viscosity, and its recovery after high shear were obtained using rotational rheometry. Filament breakup was determined in uniaxial elongational tests. Pastes were printed using a commercial screen designed for Si-solar cell front-side metallization, and the process was monitored with high temporal and spatial resolution using a transparent glass substrate and a high-speed imaging setup. Length of the pre-injection zone ahead of the squeegee scales inversely with yield stress and length of the cling zone behind the squeegee is proportional to filament rupture strain, irrespective of used additive. Paste spreading observable at the busbar and fine-line intersection takes place within 100 ms, irrespective of sample composition, demonstrating that fine-line electrode width is determined within the pre-injection zone where the paste is under pressure. A simple flow model is proposed relating electrode width to the reciprocal product of yield stress and high shear viscosity consistent with experimental data including both types of pastes.
      PubDate: 2018-08-03
      DOI: 10.1007/s11998-018-0091-2
  • Novel phosphorus-containing epoxy resin from renewable resource for
           flame-retardant coating applications
    • Authors: Deepak M. Patil; Ganesh A. Phalak; Shashank T. Mhaske
      Abstract: Abstract A phosphorus-containing epoxy resin has been derived from a renewable resource, sebacic acid (SA), and formulated for flame-retardant applications. The synthesized epoxy resin was characterized by physicochemical and spectral analysis including Fourier-transform infrared (FTIR), 1H and 31P nuclear magnetic resonance spectroscopies. Curing of the epoxy resin mixture was carried out with polyamide hardener at 1:1 stoichiometry on equivalent weight basis. The developed coatings were characterized in terms of their mechanical, solvent, gel content, water absorption, chemical, thermal, and flame-retardant properties, while the glass-transition temperature and thermal stability of the coatings were analyzed by differential scanning calorimetry and thermogravimetric analysis, respectively. The results revealed that the coatings with added SA-based epoxy resin showed good mechanical, chemical, and solvent-resistance properties. The thermal profile of the coatings manifested that the char yield increased with the concentration of the SA-based epoxy resin. Limiting oxygen index (LOI) and UL-94 tests were performed to understand the flame-retardancy behavior of the synthesized coatings, revealing an enhancement as the concentration of phosphorus-containing epoxy resin was increased.
      PubDate: 2018-07-26
      DOI: 10.1007/s11998-018-0116-x
  • Composite PCL/HA/simvastatin electrospun nanofiber coating on
           biodegradable Mg alloy for orthopedic implant application
    • Authors: Abdelrahman I. Rezk; Hamouda M. Mousa; Joshua Lee; Chan Hee Park; Cheol Sang Kim
      Abstract: Abstract Recently, magnesium (Mg) and its alloys have attracted more attention because of their biodegradability and fascinating mechanical properties in the medical field. However, their low corrosion resistance and high degradability in the body have a great effect on mechanical stability and cytocompatibility, which hinders its clinical applications. Therefore, here we introduce a bifunctional composite coating composed of polycaprolactone and synthesized hydroxyapatite nanoparticles (HA-NPs) loaded with simvastatin deposited on the AZ31 alloy via electrospinning technique. The synthesized HA-NPs and composite nanofibers layer were characterized using TEM, FE-SEM, FTIR, and XRD to understand the physiochemical properties of the composite nanofibers compared to pristine polymer and bare alloy. Corrosion resistance was evaluated electrochemically using potentiodynamic polarization and EIS measurements, and biodegradability was evaluated in terms of pH and Mg ions release in SBF solution. The as-prepared coating was found to retard the corrosion and increased the osteocompatibility as resulted in cell culture test, a higher cell attachment and proliferation on the implant biointerface, in addition to releasing simvastatin in a controlled platform.
      PubDate: 2018-07-23
      DOI: 10.1007/s11998-018-0126-8
  • Effect of microencapsulated ammonium polyphosphate on the durability and
           fire resistance of waterborne intumescent fire-retardant coatings
    • Authors: Zhitian Liu; Mengqin Dai; Qinghua Hu; Shi Liu; Xiang Gao; Fan Ren; Qi Zhang
      Abstract: Abstract Large-scale addition of hydrophilic solid filler (i.e., ammonium polyphosphate) into waterborne intumescent fire-retardant coatings can cause many problems such as poor compatibility, easy absorption of moisture, and poor durability. In this work, microencapsulated ammonium polyphosphate with melamine formaldehyde resin (MFAPP) was prepared and applied in intumescent fire-retardant coatings to solve the problems mentioned. Due to the hydrophobicity of melamine formaldehyde (MF) resin, MFAPP exhibited better water resistance, thermal stability, and compatibility with polymer matrix, which was confirmed by Fourier transform infrared spectra, scanning electron microscopy (SEM), particle size test, water solubility, water contact angle, and thermogravimetric analysis (TGA). The effect of the MFAPP on durability and fire resistance of the fire-retardant coatings test were investigated by the static immersion test, fire resistance test, TGA, and SEM. Even immersed in distilled water for 12 h, the coatings containing MFAPP did not show obvious damage, indicating microencapsulation improved the water resistance of coatings. Furthermore, the fire-resistant time and thermal stability of the waterborne intumescent fire-retardant coatings were also improved remarkably by utilizing the microencapsulation of ammonium polyphosphate.
      PubDate: 2018-07-20
      DOI: 10.1007/s11998-018-0108-x
  • Antimicrobial and improved barrier properties of natural phenolic
           compound-coated polymeric films for active packaging applications
    • Authors: Kirtiraj K. Gaikwad; Suman Singh; Youn Suk Lee
      Abstract: Abstract Functional antimicrobial low-density polyethylene (LDPE) films with coatings containing different amounts of pyrogallol (PGL), a natural phenolic substance, and polyurethane were prepared. To examine the applicability of the prepared LDPE/PGL films in packaging, the films were characterized by scanning electron microscopy, Fourier transform infrared, thermogravimetric analysis, and X-ray diffraction. The role of the coating, the barrier and color properties, and the antimicrobial activity of the films were evaluated. The thermal stability of the LDPE/PGL films was affected by the PGL concentration. Coatings with pyrogallol caused the barrier properties for water, and oxygen was increased from 0.78–0.32 to 470 ± 23.2–273 ± 57.1 (g mm)/(m2 h kPa), respectively. These findings indicate that the barrier properties of the LDPE/PGL films were highly improved compared to those of neat LDPE. Moreover, the LDPE/PGL films exhibited acceptable antimicrobial activity against Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative), especially for S. aureus. Further studies are necessary to increase the thermal stability of the pyrogallol coatings with the LDPE substrate in order to improve their performance and extend their packaging applications.
      PubDate: 2018-07-20
      DOI: 10.1007/s11998-018-0109-9
  • Alkyl 2-furoates obtained by green chemistry procedures as suitable new
           antifoulants for marine protective coatings
    • Authors: Angélica Escobar; Míriam Pérez; Ángel Sathicq; Mónica García; Analia Paola; Gustavo Romanelli; Guillermo Blustein
      Abstract: Abstract In search of new sustainable alternatives to reduce the use of metallic antifouling pigments in marine paints, three n-alkyl 2-furoates were synthesized by safe procedures framed within the green chemistry concepts. These compounds were characterized by current organic analysis, and their antifouling properties were first evaluated on Artemia salina nauplii in the laboratory. Then, antifouling paints formulated with these compounds were assayed in a marine environment. Both laboratory and field tests indicate that n-alkyl 2-furoates have strong antifouling activity and are safe chemicals for marine paints.
      PubDate: 2018-07-18
      DOI: 10.1007/s11998-018-0110-3
  • Photosensitive ink formulation and inkjet printing on flexible PET
    • Authors: F. Tricot; F. Vocanson; D. Chaussy; D. Beneventi; Y. Lefkir; N. Destouches
      Abstract: Abstract Photochromic materials whose color can reversibly change under visible light exposure are good candidates for many applications like photooptical sensors, smart inks and paints, displays or optical storage. Among these materials, inorganic Ag:TiO2 films have been proven to be stable over time and to exhibit multicolor photochromism leading to potential high-performance systems. However, their fabrication processes are often based on laboratory equipment not adapted to industrialization and usually involve thermal treatments not compatible with soft materials, which limit the application range. The present paper proposes an alternative way to produce photochromic Ag:TiO2 films compatible with industrialization and with soft substrates. An aqueous ink, made of a dispersion of TiO2 nanoparticles and silver ions, was formulated from a commercial TiO2 suspension and a silver salt by adding a thickener and a surfactant to satisfy inkjet process requirements. The inkjet printing process was optimized on polyethylene terephthalate substrates to form thin inorganic films after IR annealing. Such a process can be adapted to any kind of substrates, in particular flexible and non-heat-resistant substrates, and can be scaled at the industrial level. The photochromic behavior of the fabricated films was finally assessed successfully after an activation step.
      PubDate: 2018-07-18
      DOI: 10.1007/s11998-018-0105-0
  • Testing organic and organic–inorganic fluorinated hybrid coatings as
           protective materials for clay bricks
    • Authors: Simonetta Lucia Pagliolico; Elena Daniela Ozzello; Guido Sassi; Roberta Bongiovanni
      Abstract: Abstract The durability of brickworks, used as facing bricks, parapets, or chimneys, is a crucial aspect of the maintenance of buildings. Water absorption and penetration due to wind-driven rain, water rundown, and capillary rising can cause serious damages and a premature deterioration of porous clay bricks, and a significant increase in their thermal conductivity. Protective coatings for brickwork must provide enhanced hydrophobic properties without affecting moisture regulation and breathability of masonry. In the present work, a standardized type of facing clay brick was treated with two types of hydrophobic coatings based on a commercial perfluoropolyether oligomer containing alkoxysilane terminal groups, respectively, with or without an inorganic precursor, tetraethoxysilane, to generate in situ silica nanoparticles. The performance of the coating was assessed by multiple indicators, such as wetting delay, water absorption coefficient, protection degree by capillarity, contact angle, roughness and gloss, as a function of the amount of coating. Uncertainties analysis of indicators was carried out. Coating performance was assessed at different exposure times comparable to in situ real ones. Optimal amounts of coating were established to maximize the protection with the minimum quantity of polymer. As a result, a square meter of brick surface exposed to water for 2–4 h can absorb about 7–8 L of water. Very small amounts of PFPE coatings change the brick surface/water interactions, more than halving the absorbed water (0.5–2 l) and increasing the protection degree up to 80–100%. After longer exposure times, the reduction in absorbed water is basically higher when brick specimens are treated with organic/inorganic nanostructured hybrid PFPE coatings.
      PubDate: 2018-07-12
      DOI: 10.1007/s11998-018-0102-3
  • Natural compounds as potential algaecides for waterborne paints
    • Authors: Sandra G. Gómez de Saravia; Silvia E. Rastelli; Guillermo Blustein; Marisa R. Viera
      Abstract: Abstract To eliminate and prevent the formation of phototrophic biofilms on painted walls, chemicals are added to paints. These chemicals, in general, also have toxic effects on the environment. Plants synthesize secondary metabolites which have antimicrobial properties and that may be a sustainable alternative to traditional biocides. In this work, algal species isolated from biofilms formed on deteriorated painted surfaces were taxonomically identified. Observations with the optical microscope revealed the presence of mixed biofilms composed of algae belonging to the Cyanophyta, Chlorophyta, and Streptophyta divisions. The algaecide effect of natural compounds of vegetal origin such as anisole, eugenol, guaiacol, and thymol was evaluated by the microatmosphere technique. Growth inhibition of phototrophic organisms was obtained with thymol in all the concentrations used. Eugenol and guaiacol showed a total growth inhibition at the highest concentration assayed (300 μmol cm−2) and a decrease in growth at 40 μmol cm−2, while anisole did not exert any inhibitory action at the assayed concentrations. Due to these results, eugenol, thymol, and guaiacol were incorporated in an exterior waterborne paint at a concentration of 2%. Samples painted with these formulations were not colonized by algae, indicating that these compounds could be used as biocides in paint formulations.
      PubDate: 2018-07-10
      DOI: 10.1007/s11998-018-0099-7
  • The polyaniline-modified TiO 2 composites in water-based epoxy coating for
           corrosion protection of Q235 steel
    • Authors: Xuehui Liu; Peimin Hou; Xia Zhao; Xiumin Ma; Baorong Hou
      Abstract: Abstract The development of active systems to protect metal substrates against corrosion is a promising approach for many industrial applications. In this work, a self-healing coating based on TiO2 particles modified with polyaniline (PANI) was prepared for corrosion protection of Q235 steel. TiO2/PANI particles were synthesized by in situ polymerization and dispersed into a water-based epoxy coating. The structure and morphology of as-prepared TiO2/PANI particles were characterized by FTIR, XRD, and SEM. The anticorrosion performance of the coating was studied by electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscopy (SECM). EIS analysis showed improved corrosion protection properties in the presence of TiO2/PNAI particles. SECM measurements were performed to monitor the reduction of oxygen process as a function of exposure time in 3.5% NaCl solution. SECM results showed that the epoxy coating with TiO2/PANI particles had a superior corrosion protection relative to the blank coating after artificial defect exposure to the corrosive environment.
      PubDate: 2018-07-10
      DOI: 10.1007/s11998-018-0101-4
  • Development of a technical approach to modify the internal surface of
           biomedical tubes and other elongated small lumen macrodevices with
           parylene coating
    • Authors: Chintan Desai; Norbert Laube
      Abstract: Abstract A multitude of differently composed biomedical polymers has been researched for many years for their distinctive ease of production and wide range of applications. New technologies and new material characteristics have always evolved accordingly. The lumina of biomedical polymer tubes such as catheters, intravenous tubes, and biomedical microfluidic channels do not necessarily show the required biocompatibility and desired functionality. In such cases, the products are provided with additional inner liner or coatings to achieve the desired specific properties. Specific adjustments, for example, low friction coefficient, low gas diffusion resistance, wear resistance, and hydrophobicity, are key properties which are in focus for the improvement of biomedical surfaces. In this pilot study, a technical method was developed to deposit parylene-AF4 on the inner surface of silicone tubes with aspect ratios exceeding 78:1. Uncoated and parylene-AF4-coated silicone tubes were investigated in respect to the aforementioned physical properties. Compared to the uncoated tubes, the parylene-coated tubes showed superior quality with respect to friction coefficient, gas diffusivity as well as wear resistance. It could be demonstrated that the new technical approach is suitable to parylene-coat the inner surfaces of tubes with high aspect ratios thereby achieving conformal coatings.
      PubDate: 2018-07-09
      DOI: 10.1007/s11998-018-0104-1
  • Silane coupling agent (SCA) pretreatment and polycaprolactone (PCL)
           coating for enhanced corrosion resistance for magnesium
    • Authors: Jialin Niu; Huiyin Liu; Xin Ping; Xianchao Xun; Guangyu Li
      Abstract: Abstract To address the problem of rapid corrosion of magnesium (Mg) alloys, a biodegradable polymer film of polycaprolactone (PCL) with KH550 as silane coupling agent (SCA) was coated on Mg substrate. The effect of the coating was analyzed using electrochemical tests (potentiodynamic polarization curves and electrochemical impedance spectroscopy) and immersion tests (hydrogen evaluation tests and scratch tests). The electrochemical tests showed that the corrosion resistance was extremely improved (by nearly two orders for icorr and 1.04 V for Ecorr), and the immersion tests illustrated that the connection between PCL and Mg substrate was enhanced as well (especially in scratch tests), thus indicating significant improvement of the corrosion resistance of SCA-pretreated PCL polymer samples. In summary, SCA-pretreated PCL is a promising coating to decrease the degradation behavior of Mg substrate.
      PubDate: 2018-07-09
      DOI: 10.1007/s11998-018-0107-y
  • One-pot hydrothermal synthesis of micaceous iron oxide pigment from
           jarosite waste
    • Authors: Xiang Li; Yabo Wang; Enjie Wei; Yi Xie; Yu Zeng; Panyu Li; Yongkui Zhang
      Abstract: Abstract In this study, jarosite waste was adopted as feed material for micaceous iron oxide (MIO) pigment preparation by a one-pot hydrothermal reaction. The formation of MIO started from jarosite decomposition into akaganeite (β-FeOOH) nanoparticles in alkali solution, which then recrystallized and transformed into MIO crystals under high temperature and OH− concentration. The influences of NaOH concentration and reaction temperature on MIO formation were investigated. It was found that MIO formed when NaOH concentration and reaction temperature were equal to or higher than 2 M and 180°C, respectively. With an increase of NaOH concentration or reaction temperature, the particle size of MIO increased, leading to darkened color of the product. Moreover, quality evaluation indicated that the synthesized MIO fulfilled the required characteristics of micaceous iron oxide pigments for paints and the international standard of ISO 10601-2007 MIO-A1.
      PubDate: 2018-07-06
      DOI: 10.1007/s11998-018-0098-8
  • UV irradiation grafting of acrylamide onto dopamine-modified 316L
           stainless steel
    • Authors: Nan Yao; Jie Chen; Guochen Zhao; Ye Huang; Liming Yang; Hongbin Li; Zhenmei Sheng
      Abstract: Abstract UV irradiation grafting technique was applied on a modified 316L stainless steel (SS) surface. The SS sheets were first coated with dopamine by dipping in the dopamine solution with KIO3 and ultrasonication. Then, the acrylamide (AAm) was grafted onto the dopamine-modified SS samples under UV irradiation with ultrasonication, when the ketone-diol compound was used as a photoinitiating system. For comparison, the UV irradiation grafting of AAm was also performed without ultrasonication. The structures and morphologies of the samples were examined by Fourier transform IR spectroscopy, atomic force microscopy, and scanning electronic microscopy before and after modification, respectively. Results showed that acrylamide was successfully grafted onto the poly-dopamine-coated SS. The hydrophilicity of the modified samples improved significantly, determined by the water contact angle measurement. Shown by Tafel polarization curves, the corrosion potential of modified SS was positively shifted, which demonstrated that the corrosion resistance was improved.
      PubDate: 2018-07-06
      DOI: 10.1007/s11998-018-0095-y
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