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K. Jeyasubramanian,G.S. Hikku,A.V.M. Preethi,V.S. Benitha,N. Selvakumar 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
Superhydrophobicity on the cotton fabric was accomplished by coating a mixture of polyvinyl chloride,copper stearate and Fe2O3/Cr2O3 nanoparticles. Firm attachment of copper stearate and the nanoparticles on the surface of cotton was achieved by employing polyvinyl chloride solution as the binder. The non-wettable nature of the surface modified cotton fabrics were evaluated through WCAmeasurement, which exhibited superhydrophobic nature for nano Fe2O3 (147.58) and Cr2O3 (151.18)impregnated cotton. Moreover, the surface roughness contributing towards the enhancement of WCA oncotton was indirectly evaluated by coating a thin film over a glass surface utilizing the same additiveswas reported through AFM.
Krishnamoorthy, K.,Jeyasubramanian, K.,Premanathan, M.,Subbiah, G.,Shin, H.S.,Kim, S.J. Pergamon Press ; Elsevier Science Ltd 2014 Carbon Vol.72 No.-
Nanostructured materials are receiving growing interest in the development of a number of commercial products. In this study, we have developed a multifunctional graphene oxide (GO) nanopaint by incorporating GO sheets in an alkyd resin with suitable non-toxic additives using ball milling. The drying mechanism of the GO nanopaint has been discussed. Intermolecular cross-linking between GO and the lipid chains in the alkyd resin was studied by Fourier transform infra red spectra, Raman spectra, and X-ray photoelectron spectra, respectively. The prepared GO nanopaint exhibited good corrosion-resistant behavior in both acidic and high-salt-content solutions as examined by the immersion and electrochemical corrosion tests. The GO nanopaint coating possesses a corrosion protection efficiency of about 76% in salt water as estimated from the linear polarization studies. The antibacterial property of the GO nanopaint coated surface was studied against three bacterial strains (Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa) and the results showed that GO nanopaint inhibited the bacterial growth on its surface. The in situ biofouling tests demonstrated the inhibition of fouling on the GO nanopaint surface.
Prabhin, V.S.,Jeyasubramanian, K.,Jeyaseeli Rashmi, I.,Hikku, G.S.,Veluswamy, Pandiyarasan,Cho, Byung Jin Elsevier 2018 Materials chemistry and physics Vol.220 No.-
<P><B>Abstract</B></P> <P>This paper deals with the fabrication of super capacitor electrode material employing a facile etching process followed by electrodeposition. Nanoporous gold current collector has been fabricated by chemically dealloying commercially available 18k gold having a composition of 74% Au, 24% Cu and 2% Ag, with dilute HNO<SUB>3</SUB> solution. Electrochemically deposited MnO<SUB>2</SUB> over the prepared porous Au electrode exhibits a very high specific capacitance value of 670 Fg<SUP>-1</SUP> which is about 1.65 times greater than that of MnO<SUB>2</SUB> coated over unetched Au electrode (407 Fg<SUP>-1</SUP>). Etched and unetched MnO<SUB>2</SUB> coated electrode materials are characterized using XRD, XPS, FESEM with EDAX and AFM. Electrochemical characterization of the obtained hybrid material is evaluated by running several cyclic voltagramms using electrochemical workstation. In contrast to the MnO<SUB>2</SUB> coated unetched Au hybrid electrode system, nanoporous AuMnO<SUB>2</SUB> electrode displays higher phase angle (79°) and lower time constant (2 ms) derived from the bode plot suggesting a better capacitance value. The high specific capacitances offered with good charge/discharge rates at a potential window of 0–0.8 V, in the scan rate of 100 mV/s for 1000 cycles, exhibiting high-energy storage density of 32.56 wh/kg and 53.6 wh/kg and power density of 366 w/kg and 603 w/kg for un-etched and etched electrodes respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> MnO<SUB>2</SUB> is incorporated into porous and flat 18k Au substrates by bulk electrolysis. </LI> <LI> The MnO<SUB>2</SUB> depositions are characterized using XRD, XPS, FESEM, EDX mapping and AFM. </LI> <LI> Electrochemical analysis shows the high specific capacitance of the porous electrode. </LI> <LI> The impedance analysis suggests the superior characteristics of porous electrode. </LI> <LI> The prepared electrodes prove to be good candidate for high power applications. </LI> </UL> </P>
Nanoporous MgO as self-cleaning and anti-bacterial pigment for alkyd based coating
G.S. Hikku,K. Jeyasubramanian,S. Vignesh Kumar 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.52 No.-
This report briefed about the photo-catalytic and anti-bacterial activities of nanoporous magnesiumoxide (MgO Nps) prepared by simple gel-combustion method. Further, MgO Nps dispersed alkyd coating(MOA) was prepared by mixing MgO Nps in resin matrix along with suitable non-toxic additives usinghigh energy ball milling technique. The prepared MOA coating possesses self-cleaning behavior, degradesmethyl violet dye when exposed to sunlight. Anti-bacterial activity of MOA coating has been evaluatedagainst Escherichia coli, and Bacillus badius and shows considerable reduction in bacterial-viability. Theacquired experimental outcomes suggest the potential use of multifunctional MOA coating as nextgeneration coatings
Development of Superhydrophobic Microfibers for Bandage Coatings
T.S. Gokul Raja,K. Jeyasubramanian,M. Indhumathy 한국섬유공학회 2018 Fibers and polymers Vol.19 No.6
In this research work, a fabricated composite fiber is proposed to protect wound surfaces from infectious organisms present in water. The composite fiber comprising PMMA, ZnO, and zinc stearate was developed using an electrospinning technique. The fiber surface was scientifically studied using scanning electron microscope, Energy dispersive analysis of X-rays, powder X-ray diffraction analysis and Fourier transform Infra-Red analysis. The pores present in between perpendicularly aligned fibers serves as an excellent medium for vapor transport to a wound surface. The maximum water contact angle of the developed fiber surface was approximately 151 degrees. A commercial cotton bandage after coated with this composite layer behaves as a perfect barrier to the entry of infectious water towards the wound. The pores in the fiber surface support rich supply of environmental oxygen and transport of exudate vapor from the wound. This fiber when coated over a cotton bandage cloth on one side served as an excellent wound protecting bandage against the penetration of external microbial water and also it admits the air, water vapor etc., towards the interior. Water penetration ability of hydrophilic cotton bandage and the water arresting ability of superhydrophobic fiber coated bandage were evaluated using a facile technique. Furthermore, antimicrobial activity of test samples was evaluated against gram positive and gram negative microorganism. Also, a bacterial infiltration test supports the blocking capability of superhydrophobic fiber to water-borne bacteria. The results obtained through this experiment may be used in future as wound healing bandages in an efficient manner.
Kavitha Sri A.,Deeksha P.,Deepika G.,Nishanthini J.,Hikku G.S.,Antinate Shilpa S.,Jeyasubramanian K.,Murugesan R. 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.92 No.-
In this report, the insights for mimicking the natural phenomenon found in lotus leaves i.e. super-hydrophobic surface are compiled. Recently, there are reports that critically evaluated the application ofthis nature inspired property to many artificial substrates like metals, plastics, fabrics, paper, etc. Fromthe summarized reports, it is evident that the two important prerequisites for fabricating super-hydrophobic surfaces are necessary nano/micron scale topographical roughness and subsequentmodification by the low surface energy compounds. Detailed description about the water repellentnature, rolling-off properties of the water droplet with the nano/micro engineered surfaces in terms ofWenzel and Cassie-Baxter models are explored. Extending this application in the biotechnologicalfield asimplants is an innovative thought since employing the non-wettable character in the implants surfacecan eliminate many drawbacks. More thoughts and insights have been focused on developing super-hydrophobicity over bio-materials to reduce bacterial biofilm formation to overcome the drawback ofbiomaterial associated infections. The possible mechanisms behind the biofilm formation and how thesuper-hydrophobic surface can effectively mitigate the bacterial adhesion are also covered in detail.