Electrochemical Effects of Surface-Modified Glass Microspheres in Polyvinylpyridine and Polystyrene Sulfonate Composite Electrodes

In this work, novel composites based on poly(ε-caprolactone) (PCL) were prepared and characterized in terms of morphological, thermal, rheological and mechanical properties. Hollow glass microspheres (HGM), alone or surface modified by treatment with (3-aminopropyl)triethoxysilane (APTES) in order to enhance the compatibility between the inorganic particles and the polymer matrix, were used to obtain lightweight composites with improved properties. The silanization treatment implies a good dispersion of filler particles in the matrix and an enhanced filler–polymer adhesion. The addition of HGM to PCL has relevant implications on the rheological and mechanical properties enhancing the stiffness of the material. Furthermore, the presence of HGM strongly interferes with the crystallization behavior and thermo-oxidative degradation of PCL. The increase of PCL crystallization rate was observed as a function of the HGM amount in the composites. Finally, rotational molding tests demonstrated the possibility of successfully producing manufactured goods in PCL and PCL-based composites on both a laboratory and industrial scale.

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CELLOBIOSE DEHYDROGENASE/ EPOXY- GRAPHITE COMPOSITE WITH ARYL DIAZONIUM REDUCTION FOR LACTOSE DETECTION

Jurnal Teknologi ◽

10.11113/jt.v79.11333 ◽

2017 ◽

Vol 79 (5-3) ◽

Author(s):

Mimi Hani Abu Bakar ◽

Neil F Pasco ◽

Ravi Gooneratne ◽

Kim Byung Hong

Keyword(s):

Cellobiose Dehydrogenase ◽

Composite Electrodes ◽

Important Ingredient ◽

Graphite Composite ◽

Enzymatic Fuel Cell ◽

Multi Walled Carbon Nanotube ◽

Surface Modified ◽

Current Detection ◽

Menten Constant

Milk is an important ingredient in our day to day diet bacause of the high quality nutrients in it. In the dairy industry including cheese fermentation processes, there is a need to control the release of lactose into wastewater streams. There are methods adopted to recover the lactose and to transform the lactose into energy through renewable energy (RE) pathways. These methods however are expensive and require certain skill to operate them. In this study, in-house electrode, which is simple and can be applied after one day of fabrication were investigated. The method was by using graphite-epoxy composite electrode, surface modified with cellobiose dehydrogenase (CDH) enzyme using aryl diazonium. These designed composite electrodes were tested on its capability as biosensor for sensitivity on detecting the lactose as well as its capability as an anode in enzymatic fuel cell (EFC) on long term electrochemical stability in generating electricity from lactose oxidation. The results showed that the CDH-Aryl diazonium modified on surface of fabricated graphite-epoxy electrodes had Michaelis Menten constant Km for CDH (0.65 – 0.75 mM) comparable to available commercial electrodes reported in the literature (0.7 mM). They are also conductively sensitive with the current intensity 86% more with the above mentioned electrodes when modified with embedded multi-walled carbon nanotube (MWCNT) and gave a high reproducibility signal (63% more than fabricated electrodes without MWCNT). In addition to the above, its performance stability in continuous mode operation for 25 days, recorded almost consistent in current detection (19.2 ± 3.8 µA/ cm2). Hence, these fabricated electrodes give alternative for a sensitive lactose detector which is cheap and simple to fabricate.

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NiOOH/FeOOH Supported on Reduced Graphene Oxide Composite Electrodes for Ethanol Electrooxidation

Materials Proceedings ◽

10.3390/ciwc2020-06840 ◽

2020 ◽

Vol 2 (1) ◽

pp. 17

Author(s):

João Pedro Jenson de Oliveira ◽

Acelino Cardoso de Sá ◽

Leonardo Lataro Paim

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Alkaline Medium ◽

Potential Range ◽

Composite Electrodes ◽

Ethanol Electrooxidation ◽

Reduction Potentials ◽

Reduced Graphene ◽

Surface Modified ◽

Electrodeposition Of Metals

In this work, nickel (Ni) and Ni-Fe bimetallic microparticles were electrosynthesized at reduction potentials in the range from −0.70 V to −1.20 V (50 mV s−1) by cyclic voltammetry (CV) onto graphite/paraffin electrode surface modified with nanosheets of reduced graphene oxide (RGO). Previously, the RGO was electrodeposited by CV from a suspension of 1 mg mL−1 of graphene oxide in PBS solution with pH 9.18, in the potential range from −1.50 V to 0.50 V (10 mV s−1). After electrodeposition of metals, the oxyhydroxides were formed by CV in an alkaline medium of 0.10 mol L−1 of NaOH in the potential range from −0.20 V to 1.0 V (100 mV s−1) with successive scans until stabilization of currents. In order to characterize the developed electrodes composites, the surfaces were investigated by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). Electrochemical performance of the developed electrodes composites to ethanol electrooxidation was carried out in an alkaline medium of 0.10 mol L−1 of NaOH in the potential range from −0.20 V to 1.0 V (100 mV s−1) by CV. The electrodes were able to induce the electrooxidation of ethanol at a potential of 0.55 V for the electrode made of NiOOH/FeOOH and around of 0.60 V for the electrode modified with NiOOH.

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Analytical Electron Microscopy of Surface-Modified Ceramics

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100118291 ◽

1985 ◽

Vol 43 ◽

pp. 276-279

Author(s):

P. S. Sklad

Keyword(s):

Electron Microscopy ◽

Analytical Electron Microscopy ◽

Theoretical Models ◽

Ceramic Materials ◽

Solute Concentration ◽

Second Phase ◽

Analytical Electron ◽

Implantation Techniques ◽

Lattice Damage ◽

Surface Modified

Over the past several years, it has become increasingly evident that materials for proposed advanced energy systems will be required to operate at high temperatures and in aggressive environments. These constraints make structural ceramics attractive materials for these systems. However it is well known that the condition of the specimen surface of ceramic materials is often critical in controlling properties such as fracture toughness, oxidation resistance, and wear resistance. Ion implantation techniques offer the potential of overcoming some of the surface related limitations.While the effects of implantation on surface sensitive properties may be measured indpendently, it is important to understand the microstructural evolution leading to these changes. Analytical electron microscopy provides a useful tool for characterizing the microstructures produced in terms of solute concentration profiles, second phase formation, lattice damage, crystallinity of the implanted layer, and annealing behavior. Such analyses allow correlations to be made with theoretical models, property measurements, and results of complimentary techniques.

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SPECTRAL CHARACTERIZATION OF REDOX-ACTIVE PRUSSIAN BLUE ON METALLATED PLASMA POLYMER SURFACE MODIFIED CARBON ELECTRODES USING PHOTOTHERMAL DETECTION

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1983645 ◽

1983 ◽

Vol 44 (C6) ◽

pp. C6-285-C6-290 ◽

Cited By ~ 3

Author(s):

J. W. Childers ◽

A. L. Crumbliss ◽

P. S. Lugg ◽

R. A. Palmer ◽

N. Morosoff ◽

...

Keyword(s):

Prussian Blue ◽

Polymer Surface ◽

Spectral Characterization ◽

Plasma Polymer ◽

Carbon Electrodes ◽

Redox Active ◽

Surface Modified

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Surface modified PTFE promotes endothelial cell adhesion and simultaneously inhibits the attachment of platelets and bacteria

The Thoracic and Cardiovascular Surgeon ◽

10.1055/s-0034-1367130 ◽

2014 ◽

Vol 62 (S 01) ◽

Cited By ~ 1

Author(s):

M. Gabriel ◽

H. Weiler ◽

U. Mehlhorn ◽

C.-F. Vahl

Keyword(s):

Cell Adhesion ◽

Endothelial Cell ◽

Surface Modified ◽

Endothelial Cell Adhesion

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Experimental and Theoretical Comparable Study of Pure and Zinc Porphyrin Surface Modified ZnO Nanorod Arrays for Hybrid Solar Cell Applications

10.32792/utq/utjsci/vol7/2/26 ◽

2020 ◽

pp. 114-119

Keyword(s):

Solar Cell ◽

Electrochemical Impedance ◽

Hybrid Solar Cell ◽

Cell Performance ◽

Solar Cell Performance ◽

Solar Cell Efficiency ◽

Cell Efficiency ◽

Annealing Effects ◽

Vertically Aligned ◽

Surface Modified

Experimental and theoretical study Porphyrin-grafted ZnO nanowire arrays were investigated for organic/inorganic hybrid solar cell applications. Two types of porphyrin – Tetra (4-carboxyphenyle) TCPP and meso-Tetraphenylporphine (Zinc-TPP)were used to modify the nanowire surfaces. The vertically aligned nanowires with porphyrin modifications were embedded in graphene-enriched poly (3-hexylthiophene) [G-P3HT] for p-n junction nanowire solar cells. Surface grafting of ZnO nanowires was found to improve the solar cell efficiency. There are different effect for the two types of porphyrin as results of Zn existing. Annealing effects on the solar cell performance were investigated by heating the devices up to 225 °C in air. It was found that the cell performance was significantly degraded after annealing. The degradation was attributed to the polymer structural change at high temperature as evidenced by electrochemical impedance spectroscopy measurements.

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