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Your search keyword '"Vishnuvarthanan Mayakrishnan"' showing total 7 results
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7 results on '"Vishnuvarthanan Mayakrishnan"'

1. Band gap engineering of g-C3N4/CuS and its application in Solar Still

Author

Joshua Fernandes, Sujith Kalluri, Mohammed Alsuwaidi, Vishnuvarthanan Mayakrishnan, Chandra Mohan, and Asha Anish Madhavan

Subjects
g-C3N4, CuS, Interfacial solar steam generation, Solar desalination, Heat localization, Physics, QC1-999, Chemistry, QD1-999
Abstract

Interfacial solar steam generation is considered as economical and more effective implementation of Solar steam generation (SSG) where solar energy is concentrated at the liquid surface via the utilization of heat localization materials (HLM). Herein we report the fabrication of an HLM constituted of a nanocomposite absorber of graphitic carbon nitride (g-C3N4) and covellite copper sulfide (CuS) supported on a mixed cellulose ester membrane, with a substrate of air laid paper-wrapped polystyrene foam. This structure allowed for strong broad-spectrum absorbance, increased hydrophilic character and minimal thermal losses. The HLM system absorbed 98% of the material and had an evaporation rate of 2.58 kgs per square meter per hour. This is twice the evaporation rate of water tested under the same conditions. Moreover, as fabricated HLM was also incorporated in a solar still in order to assess its practical performance in solar distillation. Initial studies proved that HLM modified solar still was more effective than conventional solar stills.

Published
2024
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4. Mechanical, Barrier, Adhesion and Antibacterial Properties of Pullulan/Graphene Bio Nanocomposite Coating on Spray Coated Nanocellulose Film for Food Packaging Applications

Author

Radhakrishnan Kesavan, Kirubanandan Shanmugam, Subha Veeramani, R. Ilangovan, Vishnuvarthanan Mayakrishnan, and Ragavanantham Shanmugam

Subjects
Environmental Engineering, Materials science, Nanocomposite, Polymers and Plastics, Graphene, Pullulan, engineering.material, Nanocellulose, law.invention, Food packaging, chemistry.chemical_compound, Oxygen transmission rate, chemistry, Coating, Chemical engineering, law, Ultimate tensile strength, Materials Chemistry, engineering
Abstract

In this study, an environmentally friendly and biodegradable pullulan/graphene bio nanocomposite was prepared and coated on the nanocellulose film to improve the surface, mechanical, barrier and antibacterial properties. The nanocellulose films were prepared by using a spray coating of nanocellulose suspension on stainless steel plates. The graphene nanoparticles were prepared by modified Hummers method. The pullulan/graphene bio nanocomposites were prepared by solvent method with the addition of various wt% (0, 0.05, 0.1, 0.2) of graphene with pullulan. The coating was carried out by roller coating method. Results showed that the increased graphene nanoparticles in pullulan coating increased the opacity, surface hydrophobicity, tensile strength, oxygen transmission rate and watervapour transmission rate of the coated nanocellulose film. Also, the coated film showed excellent antibacterial properties against both gram-negative E. coli and gram-positive S. aureus. In this research work, it was concluded that the graphene nanoparticles of 0.2 wt% showed efficient results. The exceptional properties of the pullulan/graphene bio nanocomposite coating on the nanocellulose film will give a new pathway to high performance food packaging applications.

Published
2021
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5. Mechanical, Barrier, Adhesion and Antibacterial Properties of Pullulan / Graphene Bio Nanocomposite Coating on Spray Coated Nanocellulose Film for Food Packaging Applications

Author

Ragavanantham Shanmugam, Vishnuvarthanan Mayakrishnan, Radhakrishnan Kesavan, Kirubanandan Shanmugam, Subha Veeramani, and Rajangam Ilangovan

Abstract

In this study, an environmentally friendly and biodegradable pullulan/graphene bio nanocomposite was prepared and coated on the nanocellulose film to improve the surface, mechanical, barrier and antibacterial properties. The nanocellulose films were prepared by using a spray coating of nanocellulose suspension on stainless steel plates. The graphene nanoparticles were prepared by the modified Hummers method. The pullulan/graphene bio nanocomposites were prepared by solvent method with the addition of various wt% (0, 0.05, 0.1, 0.2) of graphene with pullulan. The coating was carried out by the roller coating method. Results showed that the increased graphene nanoparticles in pullulan coating increased the opacity, surface hydrophobicity, tensile strength, oxygen transmission rate and watervapour transmission rate of the coated nanocellulose film. Also, the coated film showed excellent antibacterial properties against both gram-negative E.coli and gram-positive S.aureus. In this research work, it was concluded that the graphene nanoparticles of 0.2 wt% showed efficient results. The exceptional properties of the pullulan/graphene bio nanocomposite coating on the nanocellulose film will give a new pathway to high performance food packaging applications.

Published
2021
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