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 24 keV 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.

Role of Oil Palm Empty Fruit Bunch-Derived Cellulose in Improving the Sonocatalytic Activity of Silver-Doped Titanium Dioxide

“…Liu et al [ 56 ] reported that the unique emission behaviors of cellulose may originate from the electron-rich oxygen and/or glucose units, which also confirms the aggregation-induced or crystallization-induced emissions from cellulose. Shanthini et al [ 57 ] also revealed that cellulose consisted of two intense PL bands at about 420–440 nm and 480–490 nm. On the other hand, the decreasing PL intensity in cellulose/Ag/TiO 2 was attributed to a decrease in the recombination rate of charge carriers in TiO 2 and the improvement of charge separation.…”

Nano-biphasic calcium phosphate/polyvinyl alcohol composites with enhanced bioactivity for bone repair via low-temperature three-dimensional printing and loading with platelet-rich fibrin

“…PVA has previously been used to carry and sustain the release of biologically active molecules. 25,26 Platelet-rich fibrin (PRF) is a second-generation platelet concentrate with a simplified preparation method that does not require the addition of thrombin or calcium chloride. 27,28 PRF has been reported to have the potential to facilitate hemostasis, wound healing, and the differentiation of preosteoblasts due to the presence of secreted growth factors.…”

Metal Doped PVA Films for Opto-Electronics-Optical and Electronic Properties, an Overview

“…For inert polymers, an ion beam may produce ultra-thin conducting or reflecting films below the polymer surface. Among others, this technique has been applied for strain gauge applications [ 98 ] or for PVA, for increasing the degree of crystallinity and microhardness [ 57 ], for fabricating planar light guides [ 99 ], and for enhanced photoluminescence [ 58 ].…”

“…Analyzed with m-line spectroscopy, a 3–5 μm thickness film (guiding light up to three modes) irradiated with a low implantation dose (<10 14 ions/cm 2 ) leads to a total waveguide loss values lower than 2 dB/cm (for 633 nm wavelength ). A cellulose reinforced polyvinyl alcohol silica (Cel-PVA-Si) composite implanted using N 3+ ions [ 58 ], shows significantly modified luminescent, thermal and mechanical properties, also as an electric conductivity improvement by about 25%. FTIR analysis reveals that the ion implanted samples undergo bond breakage.…”