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 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 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 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.

Fe(III) adsorption on graphene oxide: A low-cost and simple modification method for persulfate activation

2020 ◽  
Vol 387 ◽  
pp. 124012 ◽  
Author(s):  
Yu-Gyeong Kang ◽  
Huong Chi Vu ◽  
Yoon-Young Chang ◽  
Yoon-Seok Chang
Keyword(s):  
Graphene Oxide ◽  
Low Cost ◽  
Simple Modification ◽  
Modification Method ◽  
Persulfate Activation

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.

Green water-based binders for LiFePO4/C cathode in Li-ion batteries: a comparative study

2021 ◽  
Author(s):  
Xiaojing Zhang ◽  
xinyi Ge ◽  
Zhigang Shen ◽  
Han Ma ◽  
Jingshi Wang ◽  
...  
Keyword(s):  
Comparative Study ◽  
Polyvinylidene Fluoride ◽  
Low Cost ◽  
Green Water ◽  
Li Ion Batteries ◽  
Environmental Friendliness ◽  
Water Based ◽  
Li Ion

Compared with environmentally harmful binder polyvinylidene fluoride (PVDF) in Li-ion batteries (LIBs), water-based binders have many advantages, such as low cost, rich sources and environmental friendliness. In this study, various...

Metal-organic framework derived metal oxide/reduced graphene oxide nanocomposite, a new tool for the determination of dipyridamole

2021 ◽  
Author(s):  
Naeime Salandari-Jolge ◽  
Ali A. Ensafi ◽  
Behzad Rezaei
Keyword(s):  
Myocardial Infarction ◽  
Graphene Oxide ◽  
High Performance ◽  
High Selectivity ◽  
Low Cost ◽  
Metal Organic Framework ◽  
Heart Patients ◽  
Reduced Graphene ◽  
Metal Organic

Dipyridamole is a prescribed medication used to treat cardiovascular diseases, angina pectoris, imaging tests for heart patients, and myocardial infarction. Therefore, high selectivity and sensitivity, low cost, and high-performance speed...

scholarly journals Generating Electricity from Natural Evaporation Using PVDF Thin Films Incorporating Nanocomposite Materials

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 585
Author(s):  
Ariel Ma ◽  
Jian Yu ◽  
William Uspal
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Polyvinylidene Fluoride ◽  
Capillary Flow ◽  
Short Circuit ◽  
Current Source ◽  
Nanocomposite Materials ◽  
The Other ◽  
Pvdf Film ◽  
Ambient Conditions

Natural evaporation has recently come under consideration as a viable source of renewable energy. Demonstrations of the validity of the concept have been reported for devices incorporating carbon-based nanocomposite materials. In this study, we investigated the possibility of using polymer thin films to generate electricity from natural evaporation. We considered a polymeric system based on polyvinylidene fluoride (PVDF). Porous PVDF films were created by incorporating a variety of nanocomposite materials into the polymer structure through a simple mixing procedure. Three nanocomposite materials were considered: carbon nanotubes, graphene oxide, and silica. The evaporation-induced electricity generation was confirmed experimentally under various ambient conditions. Among the nanocomposite materials considered, mesoporous silica (SBA-15) was found to outperform the other two materials in terms of open-circuit voltage, and graphene oxide generated the highest short-circuit current. It was found that the nanocomposite material content in the PVDF film plays an important role: on the one hand, if particles are too few in number, the number of channels will be insufficient to support a strong capillary flow; on the other hand, an excessive number of particles will suppress the flow due to excessive water absorption underneath the surface. We show that the device can be modeled as a simple circuit powered by a current source with excellent agreement between the theoretical predictions and experimental data.

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