Nanocomposites VI: Nanoscience and Nanotechnology in Advanced Composites: Polymer and Other Nanocomposites
Sponsored by: TMS Structural Materials Division, TMS: Composite Materials Committee
Program Organizers: Srivatsan Tirumalai; Manoj Gupta, National University of Singapore
Thursday 2:00 PM
February 27, 2020
Room: Solana
Location: Marriott Marquis Hotel
Session Chair: Efosa Obazee, Rubber Research Institute of Nigeria
2:00 PM Invited
Facile, Large Scale Synthesis of Water Soluble Aginse2/Zns Quantum Dots and Its Cell Viability Assessment on Different Cell Lines: Samuel Oluwafemi1; 1University of Johannesburg
Herein, large-scale synthesis of water-soluble thioglycolic acid (TGA) capped and gelatin-stabilized AgInSe2/ZnSe (AISe/ZnSe) core/shell QDs in the absence of an inert atmosphere and its cell viability against different cancer cell lines is reported. The optical and structural characteristics of the as-synthesized QDs were investigated by UV-visible (vis) absorption, photoluminescence (PL) and Fourier-transmission infrared (FTIR) spectroscopies, dynamic light scattering (DLS), X-ray diffraction (XRD), and high-resolution transmission electron microscope (HRTEM) techniques. Growth of ZnSe shell on the core AISe resulted in the blue shifting of the emission maximum position with and increased PL intensity. The QDs are small and spherical in shape with an average particle diameter of 2.8 nm and 3.2 nm for AISe and AISe/ZnSe QDs respectively. The in vitro cell viability assay revealed that the as-synthesized AISe/ZnSe QDs are not toxic towards cancerous (HeLa -cervical cancer and A549-lung cancer) and normal (BHK21 –Kidney) cell lines.
2:30 PM Invited
Surface Modification of Bio Derived Carbon with Low Temperature Plasma Treatment for Polymer Composite Filler Applications: Vijaya Rangari1; Zaheeruddin Mohammed1; Shaik Jeelani1; 1Tuskegee University
Plasma, due to its ability to interact with matter at nano and meso scales it can be used as a tool to alter surface properties of various nanomaterial materials including carbon. These treatments can not only achieve desired surface properties by changing the functional group densities but also alter the crystallinity of material. The focus of this work is to study the effects of plasma treatment on in-situ synthesized carbon from various renewable sources and waste materials. Effect of various parameters like type of gas (SF6, O2, Ar and Air), plasma density, electromagnetic radiation and flux of ionized matter on the surface properties of the material are characterized by various techniques including spectroscopic and microscopic. This study shows that the plasma treatment effect in altering the surface interactions of nanomaterials with other materials which would be otherwise achieved through rigorous chemical and physical modifications.
3:00 PM
Continuous Flow Process for Removal and Recovery of Water Contaminants with Magnetic Nanocomposites: Teagan Leitzke1; Jerome Downey1; David Hutchins1; Brian St. Clair1; 1Montana Technological University
Many natural water sources and industrial wastewaters contain low concentrations of metals and other contaminants. Therefore, an efficient and economical method for low-level contaminant removal and recovery is needed. The purpose of the research is to improve and modify a newly developed continuous flow ion exchange process for expansion to a variety of non-industrial applications, including removal of metal ions from the Upper Clark Fork River Watershed. The process involves a dual column reactor designed to capture metal ions using 90-105 μm spherical, functionalized silica gel coated magnetite particles, targeting copper ions with future expansion to additional metals, such as manganese and zinc. The optimization of nanoparticle synthesis and dispersion is ongoing with variables that include pH, metal ion concentration, nanoparticle concentration, and temperature. Additional focus involves maximizing contaminant capture, with current values of 0.45 mmol Cu/g Fe3O4 for magnetite and 0.32 mmol Cu/g Fe3O4 for silica-coated magnetite.
3:25 PM Break
3:45 PM
An Electrochemical Sensing Platform based on Bimetal-telluride Nanorods Decorated Reduced Graphene Oxide Nanocomposite for Highly Sensitive Voltammetric Detection of Food Toxic Roxarsone in Meat Samples: Govindasamy Mani1; Sea-Fue Mani1; 1National Taipei University of Technology
Bimetal-telluride nanorods decorated reduced graphene oxide nanocomposite has been developed for the detection of toxic drug (roxarsone). The electrochemical behavior of roxarsone on the FeBiTe3/rGO film modified electrode was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Moreover, the obtained results confirmed its efficiency for sensing of roxarsone. In addition, the synthesized FeBiTe3/rGO nanocomposite was characterized by XRD, XPS, FESEM, HRTEM, EDS and EIS. Then, the optimization of some effective parameters on the electrochemical method efficiency including effect of scan rate, various pH and effect of concentrations. Furthermore, benefiting from their FeBiTe3/rGO uniqueness, a selective roxarsone sensor based on FeBiTe3/rGO/SPCE was developed. The nanocomposite modified SPCE presents higher electrochemical performance towards the electrocatalysis of roxarsone, such as wider linear range, lower detection limit and high sensitivity. Finally, the FeBiTe3/rGO modified SPCEs were successfully applied to detect roxarsone in various food samples with high accuracy.
4:10 PM
Chronoamperometric Approach for Detection of H2O2 Adulteration in Milk using Ag/TiO2 Nanoparticles: Bharti Sharma1; 1Guru Jambheshwar University Science and Technology
Chronoamperometric sensor based on Ag doped TiO2 nanoparticles was developed for detection of hydrogen peroxide (H2O2) in Milk. The nanoparticles were synthesized using chemical method with diameters of 15 nm. For determination of adulteration of H2O2 in milk, an electrochemical sensor was prepared by electrodepositing Ag doped TiO2 nanoparticles and immobilized using gold linker on gold electrode surface.The morphological behaviour of the modified electrode surface was analyzed by scanning electron microscopy (SEM). The modified electrode (Ag/TiO2) shows significant oxidation effect of hydrogen peroxide with starting potential around +0.05V (vs. AgCl/Ag) which significantly decreases hydrogen peroxide oxidation over potential. The electrocatalytic response current of the sensor was proportional to the H2O2 concentration in the range of 5.0×10-6 to 1.6×10-3 mol L-1 with a detection limit down to 0.21 µmol L-1.The H2O2 sensor exhibits a low detection limit with good signal reproducibility and the accurate measurements in milk as the real sample.
4:35 PM
Comparative Cytotoxicity and Photothermal Study of Graphene Oxide (Go), Graphene Quantum Dots (Gqds) And Gqds/Go-Gold Nanorod Conjugates Against Different Cancer Cell Lines: Samuel Oluwafemi1; Thabang Lebepe1; Tetsuya Kodama2; 1University of Johannesburg; 2Tohoku University
We herein report the synthesis of graphene oxide, graphene quantum dots and their conjugation to two different near infrared gold nanorods (AuNRs). All the as-synthesised materials were stable in biological media, PBS and over different pH range (4-14). The cell viability and photothermal efficiency of all the as-synthesised material were tested against four different cancer cell lines. The graphene materials were shown to be less toxic than the AuNRs alone.The GO increased the cell viability by increasing the cell attachement and proliferation of cells. However, when the GO composites are irradiated with the laser, the cells were destroyed. These results shows that the GO /GQDs – AuNRs nanocomposite possed good biocompatibility and excellent photothermal efficiency. Hence, the as-synthesised nanocomposites will be efficient materials for therapeutic application.