title: Biocide immobilized OMMT-carbon dot reduced Cu2O nanohybrid/hyperbranched epoxy nanocomposites: Mechanical, thermal, antimicrobial and optical properties.
abstract: The present work demonstrated a transparent thermosetting nanocomposite with antimicrobial and photoluminescence attributes. The nanocomposites are fabricated by incorporation of different wt.% (1, 2 and 3) of a biocide immobilized OMMT-carbon dot reduced Cu2O nanohybrid (MITH-NH) in the hyperbranched epoxy matrix. MITH-NH is obtained by immobilization of 2-methyl-4-isothiazolin-3-one hydrochloride (MITH) at room temperature using sonication on OMMT-carbon dot reduced Cu2O nanohybid. The nanohybrid is prepared by reduction of cupric acetate using carbon dot as the reducing agent in the presence of OMMT at 70°C. The significant improvements in tensile strength (~2 fold), elongation at break (3 fold), toughness (4 fold) and initial thermal degradation temperature (30°C) of the pristine hyperbranched epoxy system are achieved by incorporation of 3wt.% of MITH-NH in it. The nanocomposites exhibit strong antimicrobial activity against Staphylococcus aureus, Bacillus subtilis, Klebsiella pneumoniae and Pseudomonas aeruginosa bacteria and Candida albicans, a fungus. The nanocomposite also shows significant activity against biofilm formation compared to the pristine thermoset. Further, the nanocomposite films emit different colors on exposure of different wavelengths of UV light. The properties of these nanocomposites are also compared with the same nanohybrid without OMMT.
authors.affiliation: Advanced Polymer and Nanomaterial Laboratory, Center for Polymer Science and Technology, Department of Chemical Sciences, Tezpur University, Napaam 784028, Assam, India.
authors.forename: Bibekananda
authors.initials: B
authors.lastname: De
authors.affiliation: Department of Molecular Biology and Biotechnology, Tezpur University, Napaam 784028, Assam, India.
authors.forename: Kuldeep
authors.initials: K
authors.lastname: Gupta
authors.affiliation: Department of Molecular Biology and Biotechnology, Tezpur University, Napaam 784028, Assam, India.
authors.forename: Manabendra
authors.initials: M
authors.lastname: Mandal
authors.affiliation: Advanced Polymer and Nanomaterial Laboratory, Center for Polymer Science and Technology, Department of Chemical Sciences, Tezpur University, Napaam 784028, Assam, India. Electronic address: karakniranjan@gmail.com.
authors.forename: Niranjan
authors.initials: N
authors.lastname: Karak
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry* / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects; D002244:Carbon / Q000737:chemistry*; D003300:Copper; D004202:Disinfectants / Q000737:chemistry* / Q000494:pharmacology*; D004853:Epoxy Resins / Q000737:chemistry / Q000494:pharmacology; D008422:Materials Testing; D053761:Nanocomposites / Q000737:chemistry*; D013696:Temperature; D013718:Tensile Strength; D013844:Thiazoles / Q000737:chemistry
chemical_list: D000890:Anti-Infective Agents; D004202:Disinfectants; D004853:Epoxy Resins; D013844:Thiazoles; C011506:2-methyl-4-isothiazolin-3-one; D002244:Carbon; D003300:Copper; C000520:cuprous oxide
keywords: Antimicrobial activity; Biocide immobilization; Carbon dot reduced Cu(2)O-OMMT nanohybrid; Hyperbranched epoxy nanocomposite; Mechanical; Optical property