During the COVID-19 pandemic, personal protective equipment (PPE) has become crucial to protect humans from the transmission of the virus. The face shield is a simple and effective PPE to prevent the viral and bacteri...During the COVID-19 pandemic, personal protective equipment (PPE) has become crucial to protect humans from the transmission of the virus. The face shield is a simple and effective PPE to prevent the viral and bacterial contact. Since COVID-19 is known to be spread via respiratory droplets, the face shield has become increasingly important PPE. However, the common materials used in face shields are synthetic, environmentally unfriendly polymers, which cause an accumulation of plastic waste once disposed. Cellulose acetate (CA) can be used as an alternative for face shield films due to its ability to decompose safely in the environment;however, pristine CA cannot serve as an effective face shield due to its low hydrophobicity. In this research, the somewhat hydrophilic character of CA with a water contact angle of 55<span style="white-space:nowrap;">°</span> is experimented on: hexamethyldisilazane (HMDS) is utilized to improve the hydrophobicity of CA up to a water contact angle of 77<span style="white-space:nowrap;">°</span>. After the oxidization of the surface of CA via oxygen plasma, implementing HMDS shows a significant increase in hydrophobicity of the film.展开更多
Human skin can function steadily regardless of surrounding circumstances(dry or wet), while it is still a challenge for artificial ionic skins, which tend to release solvents in dry air and leach electrolytes in wette...Human skin can function steadily regardless of surrounding circumstances(dry or wet), while it is still a challenge for artificial ionic skins, which tend to release solvents in dry air and leach electrolytes in wetted state. Herein, a series of hierarchically crosslinked ionogels containing hydrophobic ionic liquids(ILs) is fabricated by combining a crystalline fluorinated copolymer with hydrophobic ILs. With a reasonable combination of nonvolatility, transparency, stretchablility, and sensitivity, such ionogels can work as reliable sensors for real-time monitoring human motions and operate steadily in complex environments as human skin does, which can contribute to the development of durable sensing devices with a simple design.展开更多
文摘During the COVID-19 pandemic, personal protective equipment (PPE) has become crucial to protect humans from the transmission of the virus. The face shield is a simple and effective PPE to prevent the viral and bacterial contact. Since COVID-19 is known to be spread via respiratory droplets, the face shield has become increasingly important PPE. However, the common materials used in face shields are synthetic, environmentally unfriendly polymers, which cause an accumulation of plastic waste once disposed. Cellulose acetate (CA) can be used as an alternative for face shield films due to its ability to decompose safely in the environment;however, pristine CA cannot serve as an effective face shield due to its low hydrophobicity. In this research, the somewhat hydrophilic character of CA with a water contact angle of 55<span style="white-space:nowrap;">°</span> is experimented on: hexamethyldisilazane (HMDS) is utilized to improve the hydrophobicity of CA up to a water contact angle of 77<span style="white-space:nowrap;">°</span>. After the oxidization of the surface of CA via oxygen plasma, implementing HMDS shows a significant increase in hydrophobicity of the film.
基金supported by the National Natural Science Foundation of China(Nos.21875268 and 51276009)National Research Fund for Fundamental Key Projects(Nos.2013CB933000 and 2012CB933800)+3 种基金the Key Research Program of the Chinese Academy of Sciences(Nos.KJZD-EW-M01 and KJZD-EW-M03)the 111 project(No.B14009)Youth Innovation Promotion Association,CAS(No.2016026)the China Postdoctoral Science Foundation(No.2019M650435).
文摘Human skin can function steadily regardless of surrounding circumstances(dry or wet), while it is still a challenge for artificial ionic skins, which tend to release solvents in dry air and leach electrolytes in wetted state. Herein, a series of hierarchically crosslinked ionogels containing hydrophobic ionic liquids(ILs) is fabricated by combining a crystalline fluorinated copolymer with hydrophobic ILs. With a reasonable combination of nonvolatility, transparency, stretchablility, and sensitivity, such ionogels can work as reliable sensors for real-time monitoring human motions and operate steadily in complex environments as human skin does, which can contribute to the development of durable sensing devices with a simple design.