scholarly journals Electrospun Fibers of Polybutylene Succinate/Graphene Oxide Composite for Syringe-Push Protein Absorption Membrane

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2042
Author(s):  
Nuankanya Sathirapongsasuti ◽  
Anuchan Panaksri ◽  
Sani Boonyagul ◽  
Somchai Chutipongtanate ◽  
Nuttapol Tanadchangsaeng
Keyword(s):  
Graphene Oxide ◽  
Protein Binding ◽  
Polyvinylidene Fluoride ◽  
Membrane Filtration ◽  
Binding Capacity ◽  
Low Cost ◽  
Morphological Properties ◽  
Binding Property ◽  
Oxide Composite ◽  
Polybutylene Succinate

The adsorption of proteins on membranes has been used for simple, low-cost, and minimal sample handling of large volume, low protein abundance liquid samples. Syringe-push membrane absorption (SPMA) is an innovative way to process bio-fluid samples by combining a medical syringe and protein-absorbable membrane, which makes SPMA a simple, rapid protein and proteomic analysis method. However, the membrane used for SPMA is only limited to commercially available protein-absorbable membrane options. To raise the method’s efficiency, higher protein binding capacity with a lower back pressure membrane is needed. In this research, we fabricated electrospun polybutylene succinate (PBS) membrane and compared it to electrospun polyvinylidene fluoride (PVDF). Rolling electrospinning (RE) and non-rolling electrospinning (NRE) were employed to synthesize polymer fibers, resulting in the different characteristics of mechanical and morphological properties. Adding graphene oxide (GO) composite does not affect their mechanical properties; however, electrospun PBS membrane can be applied as a filter membrane and has a higher pore area than electrospun PVDF membrane. Albumin solution filtration was performed using all the electrospun filter membranes by the SPMA technique to measure the protein capture efficiency and staining of the protein on the membranes, and these membranes were compared to the commercial filter membranes—PVDF, nitrocellulose, and Whatman no. 1. A combination of rolling electrospinning with graphene oxide composite and PBS resulted in two times more captured protein when compared to commercial membrane filtration and more than sixfold protein binding than non-composite polymer. The protein staining results further confirmed the enhancement of the protein binding property, showing more intense stained color in compositing polymer with GO.

scholarly journals Graphene oxide-based rechargeable respiratory masks

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Stelbin Peter Figerez ◽  
Sudeshna Patra ◽  
G Rajalakshmi ◽  
Tharangattu N Narayanan
Keyword(s):  
Graphene Oxide ◽  
Polyvinylidene Fluoride ◽  
Occupational Safety ◽  
Low Cost ◽  
Triboelectric Nanogenerator ◽  
Layer System ◽  
Retention Capacity ◽  
Simple Modification ◽  
Nonwoven Fabrics ◽  
Mask Design

Abstract Respiratory masks having similar standards of ‘N95’, defined by the US National Institute for Occupational Safety and Health, will be highly sought after, post the current COVID-19 pandemic. Here, such a low-cost (∼$1/mask) mask design having electrostatic rechargeability and filtration efficiency of >95% with a quality factor of ∼20 kPa−1 is demonstrated. This filtration efficacy is for particles of size 300 nm. The tri-layer mask, named PPDFGO tri, contains nylon, modified polypropylene (PPY), and cotton nonwoven fabrics as three layers. The melt-spun PPY, available in a conventional N95 mask, modified with graphene oxide and polyvinylidene fluoride mixture containing paste using a simple solution casting method acts as active filtration layer. The efficacy of this tri-layer system toward triboelectric rechargeability using small mechanical agitations is demonstrated here. These triboelectric nanogenerator (TENG)-assisted membranes have high electrostatic charge retention capacity (∼1 nC/cm2 after 5 days in ambient condition) and high rechargeability even in very humid conditions (>80% RH). A simple but robust permeability measurement set up is also constructed to test these TENG-based membranes, where a flow rate of 30–35 L/min is maintained during the testing. Such a simple modification to the existing mask designs enabling their rechargeability via external mechanical disturbances, with enhanced usability for single use as well as for reuse with decontantamination, will be highly beneficial in the realm of indispensable personal protective equipment.

scholarly journals Grafting Thin Layered Graphene Oxide onto the Surface of Nonwoven/PVDF-PAA Composite Membrane for Efficient Dye and Macromolecule Separations

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 792
Author(s):  
Febri Baskoro ◽  
Selvaraj Rajesh Kumar ◽  
Shingjiang Jessie Lue
Keyword(s):  
Graphene Oxide ◽  
Folic Acid ◽  
Methyl Orange ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Composite Membrane ◽  
Polyacrylic Acid ◽  
Bovine Serum ◽  
Polyvinylidene Fluoride ◽  
Oxide Composite

This study investigates the permeance and rejection efficiencies of different dyes (Rhodamine B and methyl orange), folic acid and a protein (bovine serum albumin) using graphene oxide composite membrane. The ultrathin separation layer of graphene oxide (thickness of 380 nm) was successfully deposited onto porous polyvinylidene fluoride-polyacrylic acid intermediate layer on nonwoven support layer using vacuum filtration. The graphene oxide addition in the composite membrane caused an increased hydrophilicity and negative surface charge than those of the membrane without graphene oxide. In the filtration process using a graphene oxide composite membrane, the permeance values of pure water, dyes, folic acid and bovine serum albumin molecules were more severely decreased (by two orders of magnitude) than those of the nonwoven/polyvinylidene fluoride-polyacrylic acid composite membrane. However, the rejection efficiency of the graphene oxide composite was significantly improved in cationic Rhodamine B (from 9% to 80.3%) and anionic methyl orange (from 28.3% to 86.6%) feed solutions. The folic acid and bovine serum albumin were nearly completely rejected from solutions using either nonwoven/polyvinylidene fluoride-polyacrylic acid or nonwoven/polyvinylidene fluoride-polyacrylic acid/graphene oxide composite membrane, but the latter possessed anti-fouling property against the protein molecules. The separation mechanism in nonwoven/polyvinylidene fluoride-polyacrylic acid membrane includes the Donnan exclusion effect (for smaller-than-pore-size solutes) and sieving mechanism (for larger solutes). The sieving mechanism governs the filtration behavior in the nonwoven/polyvinylidene fluoride-polyacrylic acid/graphene oxide composite membrane.

scholarly journals Graphene Oxide based Rechargeable Respiratory Masks

2020 ◽  
Author(s):  
Stelbin Peter Figerez ◽  
Sudeshna Patra ◽  
G. Rajalakshmi ◽  
Tharangattu Narayanan
Keyword(s):  
Graphene Oxide ◽  
Polyvinylidene Fluoride ◽  
Occupational Safety ◽  
Low Cost ◽  
Woven Fabrics ◽  
Triboelectric Nanogenerator ◽  
Retention Capacity ◽  
Simple Modification ◽  
Humid Condition ◽  
Mask Design

<div><div><div><p>Respiratory masks having similar standards of ‘N95’, defined by U.S. National Institute for Occupational Safety and Health, will be highly sought after, post this COVID-19 related pandemic condition. Here such a low cost (~$1/mask) mask design having electrostatic rechargeability and also having the filtration efficiency of >95% and quality factor of ~20 kPa-1 is demonstrated for its filtration efficacy towards particles of size < 0.5 μm. A tri-layer mask named ‘PPDFGO tri’ is designed here - containing nylon, modified polypropylene (PPY), and cotton non- woven fabrics as three layers. The melt-spun PPY, available in a conventional N95 mask, modified with graphene oxide (GO) and polyvinylidene fluoride (PVDF) mixture containing paste using a simple solution casting method acts as active filtration layer, and this tri-layer filtration system is shown for its efficacy towards triboelectric rechargeability using small mechanical agitations. These triboelectric nanogenerator (TENG) assisted masks have high electrostatic charge retention capacity (~1 nC/cm2 after 5 days in ambient condition) and high rechargeability even in the very humid condition (>80% RH). A simple but robust permeability measurement set up is also constructed to test these TENG based membranes, where a flow rate of 30-35 L/min is maintained during the testing. Such a simple modification in the existing mask designs enabling their rechargeability via external mechanical disturbances, with enhanced usability for single use as well as for reuse with decontantamination, will be highly beneficial in the modern era of indispensable personal protective equipment.</p></div></div></div>

scholarly journals Blotting Paper-Derived Activated Porous Carbon/Reduced Graphene Oxide Composite Electrodes for Supercapacitor Applications

Molecules ◽  
2019 ◽  
Vol 24 (24) ◽  
pp. 4625 ◽  
Author(s):  
Qinting Jiang ◽  
Dandan Liu ◽  
Bo Liu ◽  
Tong Zhou ◽  
Jin Zhou
Keyword(s):  
Graphene Oxide ◽  
Activated Carbon ◽  
Specific Capacitance ◽  
Reduced Graphene Oxide ◽  
Low Cost ◽  
Chemical Activation ◽  
Scale Production ◽  
Composite Electrodes ◽  
Oxide Composite ◽  
Reduced Graphene

A facile strategy, engineered for low-cost mass production, to synthesize biomass-derived activated carbon/reduced graphene oxide composite electrodes (GBPCs) by one-pot carbonization of blotting papers containing graphene oxide (GO) and zinc chloride (ZnCl2) was proposed. Benefitting from the water absorption characteristic of blotting papers in which the voids between the celluloses can easily absorb the GO/ZnCl2 solution, the chemical activation and reduction of GO can synchronously achieve via one-step carbonization process. As a result, the GBPCs deliver a large specific surface area to accumulate charge. Simultaneously, it provides high conductivity for electron transfer. The symmetric supercapacitor assembled with the optimal GBPCs in 6 M KOH electrolyte exhibits an excellent specific capacitance of 204 F g−1 (0.2 A g−1), outstanding rate capability of 100 F g−1 (20 A g−1). Meanwhile, it still keeps 90% of the initial specific capacitance over 10,000 cycles. The readily available raw material, effective chemical activation, simple rGO additive, and resulting electrochemical properties hold out the promise of hope to achieve low-cost, green, and large-scale production of practical activated carbon composite materials for high-efficiency energy storage applications.

scholarly journals Electrophysical and Morphological Properties of a Hydrothermally Synthesized CuFe2O4 and CuFe2O4 / Reduced Graphene Oxide Composite

2021 ◽  
Vol 22 (2) ◽  
pp. 372-379
Author(s):  
V.O. Kotsyubynsky ◽  
V.M. Boychuk ◽  
R.I. Zapukhlyak ◽  
M.A. Hodlevskyi ◽  
I.M. Budzulyak ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Composite Material ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Morphological Properties ◽  
Copper Ferrite ◽  
Spectroscopy Data ◽  
Oxide Composite ◽  
Reduced Graphene ◽  
Transfer Mechanisms

The aim of this paper is to compare the structural, morphological and electrical properties of the CuFe2O4 and CuFe2O4 / reduced graphene oxide composite. XRD and Mossbauer studies have shown that joint hydrothermal synthesis of cubic copper ferrite and reduction of graphene oxide leads to a decrease in ferrite particles from 14 to 8 nm. Based on the impedance spectroscopy data, a model of the obtained composite material has been prepared as a system consisting of contacting spinel particles covered with rGO clusters and separated by porous rGO. For CuFe2O4 / rGO composite material, the predominance of hopping charge transfer mechanisms has been shown, and the activation energies of electrical conductivity of grains and grain boundaries have been calculated.

scholarly journals Graphene Oxide based Rechargeable Respiratory Masks

2020 ◽  
Author(s):  
Stelbin Peter Figerez ◽  
Sudeshna Patra ◽  
G. Rajalakshmi ◽  
Tharangattu Narayanan
Keyword(s):  
Graphene Oxide ◽  
Polyvinylidene Fluoride ◽  
Occupational Safety ◽  
Low Cost ◽  
Woven Fabrics ◽  
Triboelectric Nanogenerator ◽  
Retention Capacity ◽  
Simple Modification ◽  
Humid Condition ◽  
Mask Design

<div><div><div><p>Respiratory masks having similar standards of ‘N95’, defined by U.S. National Institute for Occupational Safety and Health, will be highly sought after, post this COVID-19 related pandemic condition. Here such a low cost (~$1/mask) mask design having electrostatic rechargeability and also having the filtration efficiency of >95% and quality factor of ~20 kPa-1 is demonstrated for its filtration efficacy towards particles of size < 0.5 μm. A tri-layer mask named ‘PPDFGO tri’ is designed here - containing nylon, modified polypropylene (PPY), and cotton non- woven fabrics as three layers. The melt-spun PPY, available in a conventional N95 mask, modified with graphene oxide (GO) and polyvinylidene fluoride (PVDF) mixture containing paste using a simple solution casting method acts as active filtration layer, and this tri-layer filtration system is shown for its efficacy towards triboelectric rechargeability using small mechanical agitations. These triboelectric nanogenerator (TENG) assisted masks have high electrostatic charge retention capacity (~1 nC/cm2 after 5 days in ambient condition) and high rechargeability even in the very humid condition (>80% RH). A simple but robust permeability measurement set up is also constructed to test these TENG based membranes, where a flow rate of 30-35 L/min is maintained during the testing. Such a simple modification in the existing mask designs enabling their rechargeability via external mechanical disturbances, with enhanced usability for single use as well as for reuse with decontantamination, will be highly beneficial in the modern era of indispensable personal protective equipment.</p></div></div></div>

Temperature-induced amperometric glucose biosensor based on a poly(N-vinylcaprolactam)/graphene oxide composite film

The Analyst ◽  
2019 ◽  
Vol 144 (6) ◽  
pp. 1960-1967 ◽  
Author(s):  
Chao Chen ◽  
Pengcheng Zhao ◽  
Meijun Ni ◽  
Chunyan Li ◽  
Yixi Xie ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Composite Film ◽  
Glucose Oxidase ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Glucose Biosensor ◽  
Carbon Electrode ◽  
Oxide Composite

A temperature-induced sensing film consisting of poly(N-vinylcaprolactam) (PVCL), graphene oxide (GO) and glucose oxidase (GOD) was fabricated and used to modify a glassy carbon electrode (GCE).

scholarly journals Photocatalytic reduction of graphene oxide with cuprous oxide film under UV-vis irradiation

2020 ◽  
Vol 59 (1) ◽  
pp. 207-214 ◽  
Author(s):  
Yao Wang ◽  
Jianqing Feng ◽  
Lihua Jin ◽  
Chengshan Li
Keyword(s):  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Low Cost ◽  
Photocatalytic Reduction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Reduced Graphene ◽  
Reduction Efficiency ◽  
Metal Organic ◽  
Reduction Effect

AbstractWe have grown Cu2O films by different routes including self-oxidation and metal-organic deposition (MOD). The reduction efficiency of Cu2O films on graphene oxide (GO) synthesized by modified Hummer’s method has been studied. Surface morphology and chemical state of as-prepared Cu2O film and GO sheets reduced at different conditions have also been investigated using atomic force microscopy (AFM) and x-ray photoelectron spectroscopy (XPS). Results show that self-oxidation Cu2O film is more effective on phtocatalytic reduction of GO than MOD-Cu2O film. Moreover, reduction effect of self-oxidation Cu2O film to GO is comparable to that of environmental-friendly reducing agent of vitamin C. The present results offer a potentially eco-friendly and low-cost approach for the manufacture of reduced graphene oxide (RGO) by photocatalytic reduction.

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