D. K. SarkarUniversité du Québec à Chicoutimi | UQAC · Department of Applied Sciences (DSA)
D. K. Sarkar
Doctor of Philosophy
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April 2005 - present
Publications
Publications (91)
Healthcare-associated infections are serious public health problem. Besides antibacterial, antifungal, and antiviral therapies, one potential strategy for breaking the chain of infection transmission is via the installation of antibacterial surfaces. Aluminum is an attractive material for fabricating frequently touched surfaces such as doorknobs, p...
A two-step electrochemical deposition process has been deployed to fabricate Ag3PO4 antibacterial coating on anodized aluminum surface. Structural, morphological and chemical compositional analyses characterized by XRD, SEM and FTIR, confirm the formation of crystalline Ag3PO4 nanoparticles. The Ag3PO4 coated anodized aluminum resulted in 100% Esch...
Antimicrobial activity of silver metal has been known since history. However, the discovery of penicillin in the 1940s brought in modern antibiotics. The inherent ability of bacteria to mutate, coupled with indiscriminate use of antibiotics has resulted in development of new antibiotic resistant strains with broad-spectrum antibiotic resistance. Th...
Ultraviolet (UV)-durable superhydrophobic nanocomposite thin films have been successfully fabricated on aluminum substrates by embedding cobalt stearate (CoSA)-coated TiO2 nanoparticles in a hydrophobic polymethylhydrosiloxane (PMHS) matrix (PMHS/TiO2@CoSA) using the sol–gel process. When compared to the sharp decrease of water contact angle (WCA)...
A cost-effective superhydrophobic coating has been developed by chemical etching and spray coating of a commercially available co-polymeric silicone, composition of which was confirmed by Infrared. Morphological studies by scanning electron microscope show a micro-nano rough pattern that increased with the wt.% content of the sprayed silicone film...
This paper was unfortunately not presented - it appears in the Proceeding yet will not be refenced in IEEExplore.
This study was aimed at developing new nanocomposite coatings based on low-density
polyethylene (PE) and zinc oxide (ZnO) nanoparticle by drop casting. To improve the compatibility with
PE matrix, the surface of ZnO nanoparticle (30 nm...
Superhydrophobic cobalt stearate thin films with excellent anti-corrosion properties were successfully fabricated on aluminum substrates via electrodeposition process. The water-repellent properties were attributed to the honeycomb-like micro-nano structure as well as low surface energy of cobalt stearate. The correlation between the surface morpho...
Tuning surface wettability is of great interest for both scientific research and practical applications. We report a facile electrochemical route for tuning the superhydrophobic surface of stearic acid (SA) modified copper with over-oxidized polypyrrole (OPPy). A systematic study was performed on the relationship between pyrrole concentrations and...
Superhydrophobic nanostructured ZnAl: layered double hydroxides (LDHs) and ZnO films have been fabricated on Al and glass substrates, respectively, by a simple and cost effective chemical bath deposition technique. Randomly oriented hexagonal patterned of ZnAl: LDHs thin nanoplates are clearly observed on Al-substrate in the scanning electron micro...
Self-assembled monolayers (SAM) on the aluminum substrates are used as the adhesion promoter
between two aluminum substrates when bonded with the adhesive in adhesive bonding technology.
Traditional surface analysis tools are not capable of identifying the presence of SAM on a surface;
therefore, EIS has been used to determine their presence on the...
to be in attachment
Superhydrophobic thin films are fabricated on chemically cleaned aluminum alloy substrates by a one-step electrodeposition process in the ethanolic solution containing Ni2 + ions and stearic acid (SA) under applied DC voltage. Morphological features observed by scanning electron microscopy (SEM), indicate that the thin films are composed of caulifl...
Superhydrophobic films were coated on an aluminum alloy surface via a one-step electrochemical modification process in an ethanolic stearic acid (SA) solution containing copper nitrite (Cu(NO3)2) under a DC voltage. Various morphologies were obtained when different molar ratios of Cu/SA were used in the solution. The electrochemically modified film...
Undercalcined coke gained interest as raw material for anodes used in aluminum production since it is reported in the literature that anodes produced with this coke might have lower CO2 reactivity in the electrolytic cell. For any anode-grade coke, it is important to identify a suitable pitch which will bond well with that coke during baking and yi...
The formation of low surface energy hybrid organic-inorganic micro-nanostructured zinc stearate electrodeposit transformed the anodic aluminum oxide (AAO) surface to superhydrophobic, having a water contact angle of 160°. The corrosion current densities of the anodized and aluminum alloy surfaces are found to be 200 and 400 nA/cm2, respectively. In...
The quality of carbon anodes, consumed in electrolysis during the primary aluminum production, has an important impact on the electrolytic cell performance. Coke and pitch are the raw materials used in anode manufacturing. The raw material properties and the process parameters during production determine the anode quality. A plant receives these ma...
Superhydrophobic aluminum alloy surfaces are obtained by chemical etching using 1 M NaOH solution followed by passivation using 0.01 M ethanolic stearic acid (SA) solution. The formation of low surface energy aluminum stearate takes place during the passivation process between stearic acid and hydroxyl group-terminated aluminum alloy surfaces. A sc...
Superhydrophobic thin films have been fabricated on aluminum alloy substrates by electrophoretic deposition (EPD) process using stearic acid (SA) functionalized zinc oxide (ZnO) nanoparticles suspension in alcohols at varying bath temperatures. The deposited thin films have been characterized using both X-ray diffraction (XRD) and infrared (IR) spe...
The nanocomposite thin films of stearic acid (SA)-functionalized ZnO nanoparticles incorporated in epoxy polymer matrix have been achieved. The X-ray diffraction (XRD) studies show the formation of zinc stearate on ZnO nanoparticles as the confirmation of SA-functionalization of ZnO nanoparticles in the thin films. Morphological analyses reveal the...
Multifunctional superhydrophobic surfaces based on photocatalytic material, ZnO have generated significant research interest from both fundamental and potential applications. Superhydrophobic ZnO surfaces are usually made in multi steps by creating rough surface and subsequent hydrophobization by low-surface-energy materials. Herein, a simple and o...
Fabrication of highly ordered conducting polymers on metal surfaces has received a significant interest owing to their potential applications in organic electronic devices. In this context, we have developed a simple method for the synthesis of highly ordered polypyrrole (PPy) on copper modified aluminium surfaces via electrochemical polymerization...
Nanostructured superhydrophobic ZnO films have been fabricated on aluminum surface by a simple and cost effective chemical bath deposition technique. A perfectly hexagonal shape of ZnO nanoplates is clearly observed in the scanning electron microscopic images. The average size of these unique hexagonal plates is ∼4 μm side and ∼30 nm of thickness....
Inadequate adherent surface preparation may result in inadequate surface wetting and poor mechanical interlocking of the adhesive. Since surface preparation is important in obtaining excellent adhesive joints, AA6061-T6 alloy surface pretreatments for adhesive bonding are reported including chemical, mechanical and plasma methods. Lap shear joints...
Superhydrophobic copper surfaces have been prepared by a one-step
electrochemical modification process in an ethanolic stearic acid
solution. In this work, the corrosion properties of hydrophobic copper
surface and superhydrophobic copper surfaces were analyzed by means of
electrochemical analyses and compared with that of as-received bare
copper s...
The quality of carbon anodes, consumed in electrolysis during the primary aluminum production, has an important impact on the electrolytic cell performance. Coke and pitch are the raw materials used in anode manufacturing. The raw material properties and the process parameters during production determine the anode quality. A plant receives these ma...
E-Mails: jean-denis.brassard@uqac.ca (J.D.B.); dsarkar@uqac.ca (D.K.S.); Tel.: +1-418-545-5011 (ext. 2543). Abstract: Superhydrophobic coatings, inspired by nature, are an emerging technology. These water repellent coatings can be used as solutions for corrosion, biofouling and even water and air drag reduction applications. In this work, synthesis...
Micropatterning of surfaces has been demonstrated using composite polymer coatings of PS and PMMA of equal molecular weights in different volume proportions with varying surface topographies on silicon surfaces. The creation of PMMA masks with various surface morphological features has also been demonstrated by removal of PS from the composite coat...
Structural adhesive bonding of aluminum is widely used in aircraft and
automotive industries. It has been widely noted that surface preparation
of aluminum surfaces prior to adhesive bonding plays a significant role
in improving the strength of the adhesive bond. Surface cleanliness,
surface roughness, surface wettability and surface chemistry are...
Superhydrophobic thin films of silver were fabricated on copper substrates by galvanic ion exchange reactions in a one-step process by immersing copper substrates in silver nitrate solution containing fluoroalkylsilane in different quantities. The X-ray diffraction (XRD) analyses confirmed the formation of silver films on copper substrates and the...
Inspired by “lotus-effect”, a superhydrophobic surface, in general, is prepared via two steps: (i) creating a surface roughness and then (ii) lowering the surface energy via a self-assembly of organic molecules or via low surface energy coatings. Superhydrophobicity cannot result if one of these two essential factors does not coexist. In the presen...
Various surface characterization techniques were used to study the modified surface chemistry of superhydrophobic aluminum alloy surfaces prepared by immersing the substrates in an aqueous solution containing sodium hydroxide and fluoroalkyl-silane (FAS-17) molecules. The creation of a rough micronanostructure on the treated surfaces was revealed b...
Preparation of nanostructured superhydrophobic surfaces requires both an optimum roughness and low surface energy. Application of a direct voltage between two copper plates immersed in a dilute ethanolic stearic acid solution transforms the surface of the anodic copper electrode to superhydrophobic due to the formation of micro-nanofibrous low surf...
Superhydrophobic aluminum surfaces have been prepared by means of electrodeposition of copper on aluminum surfaces, followed by electrochemical modification using stearic acid organic molecules. Scanning electron microscopy (SEM) images show that the electrodeposited copper films follow “island growth mode” in the form of microdots and their number...
Monodispersive silica nanoparticles have been synthesized via the Stöber process and further functionalized by adding fluorinated groups using fluoroalkylsilane in an ethanolic solution. In this process, six different sizes of fluorinated silica nanoparticles of varying diameter from 40 to 300 nm are prepared and used to deposit thin films on alumi...
Oxide nanoparticles have tremendous technological applications in the present days in diverse fields. In this study, the surface modification and functionalization of hydrophilic silica (SiO2) and zinc oxide (ZnO) nanoparticles were performed to obtain superhydrophobicity. Monodispersive nanoparticles of SiO2 were prepared by Stöber process using t...
The UV protective coatings were developed by incorporating triazine derivative organic UV stabilizers into inorganic titania
particles which were produced by sol–gel method. The objective of this study is to delay the color change of heat-treated
wood subjected to outdoor conditions. The protective coatings were prepared in air at room temperature....
Superhydrophobic aluminum surfaces have been prepared by means if electrodeposition of copper on aluminum surfaces, followed by electrochemical modification using stearic acid organic molecules. Scanning electron microscopy (SEM) images show that the electrodeposited copper films follow "island growth mode" in the form of microdots and their number...
The accretion of ice on the surfaces of power network systems, aircraft, communication networks, etc., is known to cause serious problems that often lead to costly safety issues. An ideal solution would be to prevent ice from accumulating in the first place, rather than waiting for ice to accrete and then to de-ice which is both time-consuming and...
Superhydrophobic surfaces are conventionally prepared employing two steps: roughening a surface and lowering their surface energy. In the present work, a direct voltage (DC) is applied between two copper plates immersed in a dilute ethanolic stearic acid solution. The surface of the anodic copper electrode transforms to superhydrophobic due to a re...
A simple one-step process has been developed to render aluminum alloy surfaces superhydrophobic by immersing the aluminum alloy substrates in a solution containing NaOH and fluoroalkyl-silane (FAS-17) molecules. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and water contact angle measurements have been performed to cha...
In general, creation of superhydrophobic surfaces is composed of two steps: (i) creation of a rough surface and (ii) passivation of the surface with the low surface energy molecules or coatings. Superhydrophobic properties cannot be achieved on a surface without these two essential factors fulfilled. In the present work we have demonstrated that su...
Wetting characteristics of micro-nanorough substrates of aluminum and smooth silicon substrates have been studied and compared by depositing hydrocarbon and fluorinated-hydrocarbon coatings via plasma enhanced chemical vapor deposition (PECVD) technique using a mixture of Ar, CH4 and C2F6 gases. The water contact angles on the hydrocarbon and fluor...
A brief description of how superhydrophobicity can help mitigate the ice accretion problem on power network equipment and other exposed structures by reducing ice-to-surface adhesion is presented. Basic models, namely the Wenzel and Cassie–Baxter models, accounting for the contact angle of water on solid surfaces relating to the influence of surfac...
Nanosphere lithography (NSL) masks were created by spin-coating of polystyrene particles onto silicon surfaces. Fluorinated hydrocarbon films were coated on the nanosphere lithography masks using plasma-enhanced chemical vapor deposition (PECVD) to obtain ordered arrays of fluorinated hydrocarbon. Atomic force microscope images show hexagonally ord...
Superhydrophobicity has been demonstrated on ultrathin rf-sputtered Teflon coated etched aluminum surfaces. The etching of aluminum surfaces has been performed using dilute hydrochloric acid. An optimized etching time of 2.5 min is found to be essential, before Teflon coating, to obtain a highest water contact angle of 164 ± 3° with a lowest contac...
Hydrophobic properties of thin nanostructured silver films produced by galvanic exchange reaction on a copper surface were studied after passivation with stearic acid. The morphology of the silver films was controlled by varying the concentration of silver nitrate in the solution. Water contact angle as high as 156° and contact angle hysteresis as...
High-k dielectric titanium silicate (TixSi1 − xO2) thin films have been deposited by means of an optimized sol–gel process. At the optimal firing temperature of 600 °C, the Ti0.5Si0.5O2 films are shown to exhibit not only a dielectric constant (k) as high as ∼ 23 but more importantly the lowest leakage current and dielectric losses. Fourier transfo...
We report on the successful growth of high dielectric constant (high- k ) titanium silicate Ti <sub>x</sub> Si <sub>1-x</sub> O <sub>2</sub> thin films of various compositions (0≤x≤1) at room temperature from the cosputtering of Si O <sub>2</sub> and Ti O <sub>2</sub> targets. The developed process is shown to offer the latitude required to achieve...
Superhydrophobic zinc oxide (ZnO) nanotowers have
been grown successfully on sodalime glass substrates by
chemical bath deposition (CBD). Chemically and
ultrasonically cleaned glass substrates have been immersed
in beakers containing 100 ml of and
different amounts (4 – 10 ml) of 28% solution.
The CBD has been performed in an oven at 70
M Zn(NO ) H...
An optimized reduction of silver ions in presence of ethylene glycol (EG) and polyvinylpyrrolidone (PVP) produced colloidal silver nanoparticles in the solution. This colloidal solution has been spin-coated on glass substrates, annealed, and finally coated with thin films of polytetrafluoroethylene (PTFE) by plasma sputtering. AFM studies show that...
Nanostructured patterns have been produced on aluminum surfaces by chemical etching. The density of these nanopatterns increases with an increase in concentration of the etchant. The patterned aluminum surfaces have been passivated using stearic acid (SA) organic molecules. The passivated surfaces are found to be superhydrophobic exhibiting the lot...
Titanium silicate (TixSi1−xO2) nanocomposite thin films containing dispersed TiO2 nanocrystallites have been grown by means of an optimized sol-gel process. The size of the TiO2 nanoprecipitates was varied from ∼ 1 to 22 nm by controlling the content of the TiO2 component of the films. For the Ti0.40Si0.60O2 film composition, which contains TiO2 na...
The sol–gel technique has been used to produce Ag – Si O <sub>2</sub> nanocomposite thin films consisting of silver nanoparticles embedded in a Si O <sub>2</sub> matrix. The size of the silver nanoparticles is of about (4±0.2) nm when the firing temperature is in the (500–700 ° C ) range, as determined from ultraviolet-visible spectroscopy analysis...
Metal silicides are produced by high energy heavy ion (120 MeV Au9+, fluence-1 × 1013 ions/cm2) irradiation in transition metal/silicon (Mn/Si single layer and Ni/Si single and multilayer) samples. X-ray reflectivity (XRR) studies are carried out on both the virgin and irradiated samples to find out the presence of silicides at the interfaces betwe...
The surface composition of hydrogel contact lenses that contain silicon-based monomers, PureVision™ (balafilcon A) and Focus® Night&Day™ (lotrafilcon A), were investigated by X-ray photoelectron spectroscopy (XPS). Conventional and daily disposable hydrogel lenses based on hydroxyethyl methacrylate (HEMA) were also studied, with the commonly prescr...
Titanium silicate (TiSixOy) thin films have been
successfully deposited by means of radio-frequency magnetron sputtering
of a TiO2/SiO2 composite target in a reactive gas
atmosphere. The deposition of the films was investigated as a function
of the [O2]/([Ar]+[O2]) flow ratio in the 0%-30%
range. The bonding states and the dielectric properties of...
The surface composition of hydrogel contact lenses that contain silicon-based monomers, PureVision™ (balafilcon A) and Focus® Night&Day™ (lotrafilcon A), were investigated by X-ray photoelectron spectroscopy (XPS). Conventional and daily disposable hydrogel lenses based on hydroxyethyl methacrylate (HEMA) were also studied, with the commonly prescr...
We report on the successful growth of amorphous TiSiOx thin films by means of pulsed-laser ablation of a TiO2/SiO2 composite target in a high-vacuum chamber. The room-temperature resistivity of the TiSiOx films is found to decrease by more than 6 orders of magnitude (i.e., from ∼ 2×104 to 10−2 Ω cm) when their substrate deposition temperature (Td)...
We report on the deposition of high-k titanium silicate (TiSiO_4) dielectric thin films by means of two different techniques, namely the pulsed laser deposition (PLD) and rf-magnetron sputtering. The bonding states and microstructure of the deposited films were characterized as a function of growth conditions. XPS and FTIR characterizations have pr...
Copper nanocrystals have been grown on thin polypyrrole films obtained by electropolymerization on a gold electrode from CuSO4 solution electrochemically in both potentiostatic (constant potential) and galvanostatic (constant current) modes. A variety of copper nanostructures including fractals, nanowires, and cubic nanocrystals have been observed...
In the present work, self-assembled nanostructures of copper are grown by electrodeposition on a thin conducting polymer (polypyrrole) film electropolymerized on a gold electrode. The shapes, sizes and the densities of the nanostructures are found to depend on the thickness of the polypyrrole thin film, which provides an easy means to control the m...
Semiconducting higher manganese silicides (HMS) with a composition near that of MnSi1.7 are of special interest due to their thermoelectric properties. We report on the growth of HMS layers deposited by MBE using the template technique. In particular the influence of the template thickness on the structure and morphology of MnSi1.7 films on (001)Si...
We report the pulsed-laser deposition of high-k titanium silicate thin films. The titanium silicate films were deposited by laser ablating a (Ti, Si) target in an oxygen pressure of 70 mTorr. The deposited films were found to exhibit nanocrystalline structure with a grain size of about 3.5 nm as deduced from x-ray diffraction measurements. Fourier...
The silicides of manganese most rich in silicon, the so-called higher manganese silicides (HMS) have a composition MnSix with x in the range from 1.67 to 1.75. This material group with a tetragonal crystal structure shows semiconducting electronic properties promising the application in thermoelectric devices (C.B. Viniing, Proceedings of the IX In...
Thin CoSi2 films have been grown on Si(100) substrates using the relative deposition epitaxy method. The structure of the silicide films have been analyzed using x-ray diffraction, transmission electron microscopy (TEM), and Rutherford backscattering spectrometry and channeling, and the interface roughness of the CoSi2/Si(100) is analyzed using spe...
Thin films of different metals M (M=Ti, Zr, Hf, Nb, Fe, and Ni) of thickness around 10 nm are deposited on Si(100) substrates and a {similar_to}30nm Co film is deposited on these metal films using the magnetron sputtering method. Cross-sectional transmission electron microscopy (XTEM) shows the presence of a {similar_to}2nm buried ultrathin amorpho...
The most rich silicon silicides of manganese, the group of higher manganese silicides (HMS), have the composition MnSix with x in the range from 1.67 to 1.75. This material group with a tetragonal crystal structure shows semiconducting electronic properties, with promising application in thermoelectric devices. This paper reports the structural and...
In the present study, a 500 Å thin Ag film was deposited by thermal evaporation on 5% HF etched Si(1 1 1) substrate at a chamber pressure of 8×10−6 mbar. The films were irradiated with 100 keV Ar+ ions at room temperature (RT) and at elevated temperatures to a fluence of 1×1016 cm−2 at a flux of 5.55×1012 ions/cm2/s. Surface morphology of the Ar io...
The presence of a buried, ultra-thin amorphous interlayer in the interface of room temperature deposited Ni film with a crystalline
Si(100) substrate has been observed using cross sectional transmission electron microscopy (XTEM). The electron density of
the interlayer silicide is found to be 2.02e/Å3 by specular X-ray reflectivity (XRR) measuremen...
Ion beam mixing has been extensively used in metal/metal and metal/silicon systems to promote new phase formations. In the present study a 500 Å thick Ag film was deposited by thermal evaporation on 5% HF-etched Si(111) at a chamber pressure of 8×10-6 mbar. The films were irradiated with 100 keV Ar+ ions at different temperatures to a dose of 1×101...
The Au/Si(111) system is irradiated at elevated temperatures using Ar+ ions. The structural study is carried out using grazing incidence X-ray diffraction (GIXRD) and Rutherford backscattering spectrometry (RBS). The surface morphology of the sample is determined using atomic force microscopy (AFM) and scanning electron microscopy (SEM). The format...
Ion beam mixing has been extensively used in Metal/Metal and Metal/Silicon systems to produce the new phases. In the present study a Cu film of thickness 500 Å was deposited by thermal evaporation at a pressure of 8×10−4 Pa on 5% HF etched Si(1 1 1). The films were irradiated with 80 keV Ar+ ions at room temperature with different doses. The Ruther...
Plasma etching of epitaxial CoSi2 films with a ternary Co–Ti–Si top layer formed during solid phase reaction of Co/Ti bilayers on Si(100) was investigated. By using a pure argon-RF-plasma the ternary top layer was sputtered without formation of a disturbing overlayer. The main disadvantage of this process is the formation of a crater-like surface m...
The reaction of Co with epitaxial Si1−yCy(001) films is investigated with regard to dependence on annealing temperature and C concentration y. Resistance measurements and RBS analysis reveal a small increase in the disilicide formation temperature. The electrical properties are very similar for thin CoSi2 films grown at 650°C on Si0.999C0.001 and o...
The formation of the silicide MnSi1.7 by reactive deposition of Mn onto Si(001) has been studied using Sb as a surfactant. The growth was performed under UHV conditions by simultaneous or consecutive exposure of the Si substrates, held at high temperatures (550°C, 600 °C), to a flux of Sb and Mn atoms. The presence of Sb during the growth strongly...
Grazing incidence X-ray diffraction (GIXRD) and X-ray photoelectron spectroscopy (XPS) are used for phase identification and the determination of chemical states of the CuSi(1 1 1) system ion beam mixed at room temperature (RT) and 100°C. Cu 2p and Si 2p photoelectron peaks are analyzed to study the silicide formation. GIXRD study shows the formati...
Grazing Incidence X-ray diffraction (GIXRD) and the X-ray Photoelectron Spectroscopy (XPS) studies were carried out on ion-beam irradiated AuSi(1 1 1) system at room temperature (RT) and elevated temperature. The gold films of 500 Å were vapour deposited on Si(1 1 1) keeping the substrate at room temperature. The samples were irradiated with 120 ke...
X-ray photoelectron spectroscopic (XPS) studies were carried out on ion-beam irradiated Au/Si system. Thin films of Au (500 Å) were vapour deposited on Si〈111〉 and irradiated with 120 keV Ar+ ions at different temperatures. The XPS investigation showed the formation of gold silicide. Even in the case of the sample irradiated at room temperature sil...
UV protective coatings are developed by incorporating triazine derivative organic UV stabilizers into inorganic titania particles which is produced by sol-gel method. The objective of this study is to delay the color change of heat-treated wood subjected to outdoor conditions. The protective coatings are prepared in air at room temperature. Thermal...
Questions
Questions (8)
What is the cheapest IR absorbing dye that can be used on coloring the anodized aluminum?
As graphane is used almost every where to make composite materials, what is the best way to ensure the quality of it?
XRD?
RAMAN?
Electrical conductivity?
We are working on the anodization of aluminum. We are successful to fabricate 100 nm pore size alumina on aluminum alloy. How can make them micrometer size?
Applications are invited for Ph.D., postdoc and short-term positions under:
Québec-India; Québec-Brazil; Québec-Mexico ; Québec-China ; Québec-Belgium (Wallonie)
Candidates possess good academic and publication records send their (i) CV, (ii) scanned mark sheets and certificates and (iii) a short proposal (maximum 3 pages) in the field of nanomaterials and nanotechnology towards energy storage/conversion, directly to dsarkar@uqac.ca by 4th September.
D. K. Sarkar, Ph.D.
Professeur
Département des sciences appliquées
Université du Québec à Chicoutimi
Pavillon principal, bureau P4-3280
555, boulevard de l'Université
(Chicoutimi) Saguenay (Québec) G7H 2B1
Phone: 418-545-5011 ext. 2543
E-mail: dsarkar@uqac.ca
See the following link: http://sae.uqac.ca/bourses/jobs/etudiants-etrangers-pbeee-du-meesr-du-frqnt-et-du-frqsc/
I have deposited an organic-inorganic coating on copper and aluminum substrates. The OCP of the coating on cooper is same as the coper substrate but much lower than aluminum. Though the methods of coatings are not the same for aluminum and copper substrate, the composition of the coating (analyzed by XRD, FTIR, EDX) is found to be same. The thickness of the coating on aluminum is larger than on copper (coating thickness is less than five micron). Therefore, I doubt the electrical resistivity might be the cause of lowering of the OCP of this coating on aluminum substrate. I have never come across any discussion or analysis relevant to this issue before. Any suggestion or reference is highly appreciated. I am here to learn from the corrosion the community.
Thanks
Dilip
