New Hydrogen Bonding Enhanced Polyvinyl Alcohol Based Self‐Charged Medical Mask with Superior Charge Retention and Moisture Resistance Performances

Abstract

The water vapor exhaled by the human body can severely accelerate the charge dissipation of a polypropylene (PP)-based medical mask, thereby reducing the electrostatic adsorption efficiency to cause infection. To solve this problem, a new type of polyvinyl alcohol (PVA)-based medical mask through electrostatic spinning to replace the PP melt-blown layer, which has self-charging and charge retention performance in a high humidity environment is fabricated. The PVA is rich in hydroxyl groups, which can spontaneously form hydrogen bonds with water vapor molecules exhaled by the human body and fix water molecules to increase the triboelectricity. By analyzing the electrical output performance of PVA-based triboelectric nanogenerator (TENG), it is shown that the short circuit current is ≈26 times larger than that of PP-based TENG in 95% relative humidity (RH). Moreover, PVA has a strong charge storage capacity and self-charging performance, as determined by hand touching under a high humidity environment. The static dissipation rate of PVA is 1.4 times lower than that of PP at a 95% RH. In comparison with PP-based medical masks, PVAbased medical masks have a high humidity resistance and self-charging performance and can be easily recharged in situ by hand slapping without taking it off for many times.

Interfacial Polarization and Dual Charge Transfer Induced High Permittivity of Carbon Dots‐Based Composite as Humidity‐Resistant Tribomaterial for Efficient Biomechanical Energy Harvesting

“…This is because moisture can accelerate surface charges dissipation of friction layers and sharply cripple the triboelectricity of TENGs. [ 69 ] As the contact‐separation of two friction layers, moisture on the surface gradually evaporates, thus the Q sc of PDMS/Al‐ and PTFE/Al‐based TENGs has a slight recovering. In contrast, when water droplets were sprayed, the Q sc of CPP‐TENGs reveals an interesting variation trend, that is, decreases first and then increases rapidly.…”

Smart Materials Enabled with Artificial Intelligence for Healthcare Wearables

“…[95] In response, many efforts have been made to develop novel antiviral materials to prevent one or combination of the viral infection steps (Figure 5), [96,97] including attachment, penetration, uncoating, replication, assembly and virion release. [98] Anti-viral materials have been designed to thwart virus spreading at each step, such as inhibiting virus attachment, [99,100] inactivating viruses during their attachment, [101] blocking viruscell binding and penetration, [102] inhibiting viral replication process, [103] and inhibiting budding and spreading. [104] These anti-viral materials work as protective shields and therapeutic agents.…”

“…It could be used for sweat analysis within stationary and [98] Copyright 2017, Elsevier Inc. Anti-viral materials: Inhibiting the virus attachment, reproduced with permission. [100] Copyright 2021, Wiley-VCH; Inactivating viruses during attachment, reproduced with permission. [101] Copyright 2018, The Authors, some rights reserved; exclusive licensee AAAS.…”

“…Viral infection process: Reproduced with permission [98]. Copyright 2017, Elsevier Inc. Anti-viral materials: Inhibiting the virus attachment, reproduced with permission [100]. Copyright 2021, Wiley-VCH; Inactivating viruses during attachment, reproduced with permission [101].…”

Antiviral Electrospun Polymer Composites: Recent Advances and Opportunities for Tackling COVID-19

“…Since the PVA is rich in hydroxyl groups, the electrospun polyvinyl alcohol (PVA) formed hydrogen bonds with water molecules exhaled by the human body. The trapped water molecules thus increased the triboelectricity and enhanced charge retention performance in a high humidity environment (Wang et al, 2021).…”