title: Surface stiffening and enhanced photoluminescence of ion implanted cellulose - polyvinyl alcohol - silica composite.
abstract: Novel Cellulose (Cel) reinforced polyvinyl alcohol (PVA)-Silica (Si) composite which has good stability and in vitro degradation was prepared by lyophilization technique and implanted using N(3+) ions of energy 24keV in the fluences of 1×10(15), 5×10(15) and 1×10(16)ions/cm(2). SEM analysis revealed the formation of microstructures, and improved the surface roughness on ion implantation. In addition to these structural changes, the implantation significantly modified the luminescent, thermal and mechanical properties of the samples. The elastic modulus of the implanted samples has increased by about 50 times compared to the pristine which confirms that the stiffness of the sample surface has increased remarkably on ion implantation. The photoluminescence of the native cellulose has improved greatly due to defect site, dangling bonds and hydrogen passivation. Electric conductivity of the ion implanted samples was improved by about 25%. Hence, low energy ion implantation tunes the mechanical property, surface roughness and further induces the formation of nano structures. MG63 cells seeded onto the scaffolds reveals that with the increase in implantation fluence, the cell attachment, viability and proliferation have improved greatly compared to pristine. The enhancement of cell growth of about 59% was observed in the implanted samples compared to pristine. These properties will enable the scaffolds to be ideal for bone tissue engineering and imaging applications.
authors: Crystal Growth Centre, Anna University, Chennai 600 025, India.
authors: G M
authors: GM
authors: Shanthini
authors: Crystal Growth Centre, Anna University, Chennai 600 025, India.
authors: N
authors: N
authors: Sakthivel
authors: Variable Energy Cyclotron Centre (VECC), Kolkata 700064, West Bengal, India.
authors: Ranjini
authors: R
authors: Menon
authors: Variable Energy Cyclotron Centre (VECC), Kolkata 700064, West Bengal, India.
authors: P Y
authors: PY
authors: Nabhiraj
authors: Centre for Biomaterials and Tissue Engineering, CBIT, Universitat Politècnica de València, 46022 Valencia, Spain.
authors: J A
authors: JA
authors: Gómez-Tejedor
authors: Centre for Biomaterials and Tissue Engineering, CBIT, Universitat Politècnica de València, 46022 Valencia, Spain; Ciber en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 46022 Valencia, Spain.
authors: J M
authors: JM
authors: Meseguer-Dueñas
authors: Centre for Biomaterials and Tissue Engineering, CBIT, Universitat Politècnica de València, 46022 Valencia, Spain; Ciber en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 46022 Valencia, Spain.
authors: J L
authors: JL
authors: Gómez Ribelles
authors: UGC-DAE Consortium for Scientific Research, Bidhan Nagar, Kolkata 700098, West Bengal, India.
authors: J B M
authors: JBM
authors: Krishna
authors: Crystal Growth Centre, Anna University, Chennai 600 025, India. Electronic address: kalkura@gmail.com.
authors: S Narayana
authors: SN
authors: Kalkura
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D002448:Cell Adhesion; D002460:Cell Line; D002482:Cellulose / Q000737:chemistry*; D055119:Elastic Modulus; D004553:Electric Conductivity; D003368:Gossypium / Q000737:chemistry; D006801:Humans; D007477:Ions / Q000737:chemistry; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D054457:Tissue Scaffolds / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D007477:Ions; D049408:Luminescent Agents; D012822:Silicon Dioxide; D011142:Polyvinyl Alcohol; D002482:Cellulose
keywords: Cellulose; Composites; Elastic modulus; Ion implantation; Photoluminescence; Silica