One-step preparation of surface modified electrospun microfibers as suitable supports for protein immobilization

2017 ◽  
Vol 8 (11) ◽  
pp. 1790-1796 ◽  
Author(s):  
Guillaume Martrou ◽  
Marc Léonetti ◽  
Didier Gigmes ◽  
Thomas Trimaille
Keyword(s):  
Protein Immobilization ◽  
Immobilized Enzymes ◽  
Step Process ◽  
One Step ◽  
The Stability ◽  
Surface Modified

Surface modified microfibers were prepared in a one-step process, and were prone to retain the activity and improve the stability of immobilized enzymes.

scholarly journals Characterization and Nanofluid Stability of CoFe2O4-APTES and CoFe2O4-PVA Nanoparticles

2020 ◽  
Vol 78 (1) ◽  
pp. 79-87
Author(s):  
Anis Arisa Roslan ◽  
Hasnah Mohd Zaid ◽  
Siti Nur Azella Zaine ◽  
Mursyidah Umar ◽  
Beh Hoe Guan
Keyword(s):  
Surface Modification ◽  
Zeta Potential ◽  
Performance Studies ◽  
Colloidal Stability ◽  
Amino Silane ◽  
Cobalt Iron Oxide ◽  
One Step ◽  
The Stability ◽  
Surface Modified ◽  
Surface Modified Nanoparticles

Nanofluid contains nanoparticles that enhanced the property of the base fluid. However, the separating layer between the nanoparticles and base fluids may interfere the nanofluids performance. Studies have been made that surface modification of nanoparticles may improve the dispersion of nanoparticles in base fluids. This paper reports the study of the colloidal stability of surface modified nanoparticles using a polymer and an amino-silane. The nanoparticles were prepared by one-step and two-step methods using cobalt iron oxide nanoparticles with brine solution and deionized water as the base fluids. Functionalization by surface modification of the nanoparticles to enhance the nanofluids stability was carried out using (3-aminopropyl) triethoxysilane (APTES) and polyvinyl alcohol (PVA). Characterization using Fourier Transform Infrared (FTIR), Field Emission Scanning Electron Microscope (FESEM) and X-ray Powder Diffraction (XRD) were performed to study the functionality and morphology of the synthesized nanoparticles. The extra IR peaks such as Si-O-Si at 1063 cm-1 for CoFe2O4-APTES and C=O at 1742 cm-1 for CoFe2O4-PVA showed that there are additional elements in the cobalt ferrite due to functionalization. The size of synthesized CoFe2O4-APTES ranged between 15.99 nm to 26.89 nm while CoFe2O4-PVA is from 25.70 nm to 54.16 nm. The stability of the nanofluid were determined via zeta potential measurements. CoFe2O4-APTES nanofluid has zeta potential of -35.7 mV compared to CoFe2O4-PVA at -15.5 mV.

Interfacial Reaction and Electrochemical Activity of Thiokol Rubber/Conjugated Polymer Composites

1996 ◽  
Vol 461 ◽  
Author(s):  
Gong Ke-Cheng ◽  
Ma Wen-Shi
Keyword(s):  
Carbon Black ◽  
Conjugated Polymer ◽  
Oxidation Reaction ◽  
Reduction Potential ◽  
Composite Films ◽  
Oxidation Potential ◽  
Cyclic Voltammograms ◽  
Step Process ◽  
One Step ◽  
The Stability

ABSTRACTThe highly electroactive thiokol rubber (TR)/ conjugated polymer (eg. polyaniline (PAn) or polypyrrole (PPy)) composite films were prepared by electropolymenzation deposition via one-step process in the electrolytic solutions containing aniline or pyrrole and TR oligomer. The electrocatalysis of PAn or PPy for the electrodepolymerization (reduction)- electropolymenzation (oxidation) reaction of TR in the interface between PAn or PPy and TR is determined by cyclic voltammograms. The differeme between the oxidation potential and the reduction potential is 0.05V and 0.36V or less for TR/PAn and TR/PPy composite films, respectively The chemical bands between the nitrogen atoms of PAn or PPy and the mercaptan groups of TR (oligomer) are formed in the electropolymenzation process that is indicated by XPS. The conductivities of TR/PAn and TR/PPy composite films and the stability of the cells consisting of those films are remarkably improved after electrochemical reduction with addition of a suitable conducting carbon black.

Surface-modified single wall carbon nanohorn as an effective electrocatalyst for platinum-free fuel cell cathodes

2015 ◽  
Vol 3 (8) ◽  
pp. 4361-4367 ◽  
Author(s):  
Sreekuttan M. Unni ◽  
Sarath Ramadas ◽  
Rajith Illathvalappil ◽  
Siddheswar N. Bhange ◽  
Sreekumar Kurungot
Keyword(s):  
Fuel Cell ◽  
Oxygen Reduction ◽  
Step Process ◽  
Carbon Nanohorns ◽  
Single Walled Carbon ◽  
Reduction Activity ◽  
Fuel Cell Cathodes ◽  
One Step ◽  
Surface Modified ◽  
Cell Cathodes

A completely Pt-free electrocatalyst whose oxygen reduction activity is comparable to Pt/C could be prepared by a one-step process involving annealing of single walled carbon nanohorns, melamine and FeCl3.

Functionalized aluminum-catalyzed silicon nanowire formation and radial junction photovoltaic devices

Nanoscale ◽  
2021 ◽  
Author(s):  
Wipakorn Jevasuwan ◽  
Naoki Fukata
Keyword(s):  
Surface Modification ◽  
Solar Cells ◽  
Surface Defects ◽  
Silicon Nanowire ◽  
Photovoltaic Devices ◽  
Step Process ◽  
One Step ◽  
Length Reduction

Vertical Al-catalyzed SiNW arrays with shaped surfaces were synthesized by a one-step process and NW-based solar cells were demonstrated with optimized NW surface defects through surface modification and length reduction.

Comparison of the Stability of Surface-Modified SWNTs and DWNTs Network Films

2010 ◽  
Vol 114 (10) ◽  
pp. 4394-4398 ◽  
Author(s):  
Seung Bo Yang ◽  
Byung-Seon Kong ◽  
Dae-Woo Kim ◽  
Hee-Tae Jung
Keyword(s):  
The Stability ◽  
Surface Modified

MgO nanoparticles synthesized starting from an innovative one-step process

2017 ◽  
Vol 101 (4) ◽  
pp. 1780-1789 ◽  
Author(s):  
Giuliana Taglieri ◽  
Valeria Daniele ◽  
Claudia Mondelli
Keyword(s):  
Mgo Nanoparticles ◽  
Step Process ◽  
One Step

Effects of finite-rate chemistry and detailed transport on the instability of jet diffusion flames

2014 ◽  
Vol 745 ◽  
pp. 647-681 ◽  
Author(s):  
Yee Chee See ◽  
Matthias Ihme
Keyword(s):  
Transport Properties ◽  
Diffusion Flames ◽  
Diffusive Transport ◽  
Mean Flow ◽  
Stability Behaviour ◽  
Jet Diffusion Flames ◽  
One Step ◽  
The Mean ◽  
Modelling Assumptions ◽  
The Stability

AbstractLocal linear stability analysis has been shown to provide valuable information about the response of jet diffusion flames to flow-field perturbations. However, this analysis commonly relies on several modelling assumptions about the mean flow prescription, the thermo-viscous-diffusive transport properties, and the complexity and representation of the chemical reaction mechanisms. In this work, the effects of these modelling assumptions on the stability behaviour of a jet diffusion flame are systematically investigated. A flamelet formulation is combined with linear stability theory to fully account for the effects of complex transport properties and the detailed reaction chemistry on the perturbation dynamics. The model is applied to a methane–air jet diffusion flame that was experimentally investigated by Füriet al.(Proc. Combust. Inst., vol. 29, 2002, pp. 1653–1661). Detailed simulations are performed to obtain mean flow quantities, about which the stability analysis is performed. Simulation results show that the growth rate of the inviscid instability mode is insensitive to the representation of the transport properties at low frequencies, and exhibits a stronger dependence on the mean flow representation. The effects of the complexity of the reaction chemistry on the stability behaviour are investigated in the context of an adiabatic jet flame configuration. Comparisons with a detailed chemical-kinetics model show that the use of a one-step chemistry representation in combination with a simplified viscous-diffusive transport model can affect the mean flow representation and heat release location, thereby modifying the instability behaviour. This is attributed to the shift in the flame structure predicted by the one-step chemistry model, and is further exacerbated by the representation of the transport properties. A pinch-point analysis is performed to investigate the stability behaviour; it is shown that the shear-layer instability is convectively unstable, while the outer buoyancy-driven instability mode transitions from absolutely to convectively unstable in the nozzle near field, and this transition point is dependent on the Froude number.

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