High-air
humidity, especially condensation into droplets under
the influence of temperature, can pose a serious threat to air purification
filters. This report introduces the use of methyltrimethoxysilane
(MTMS) for the silanization hydrophobic modification of cellulose
nanofibers (CNFs) and obtains an air filter with super-hydrophobicity
(CA = 152.4°) and high-efficiency filtration of particulate matter
(PM) through the freeze-drying technology. The antihumidity performance
of CNFs filters that undergo hydrophobic modification in high-humidity
air is improved. Especially in the case of high-humidity air forming
condensed water droplets, the increase in the rate of filtration resistance
of the hydrophobically modified CNFs filter is much lower than that
of the unmodified filter. In addition, the water-vapor-transmission
rate of the hydrophobically modified filter is improved. More importantly,
adding MTMS can regulate the porous structure of CNFs filters and
improve the filtration performance. The specific surface area and
the porosity of the filter are 26.54 m2/g and 99.21%, respectively,
and the filtering effects of PM1.0 and PM2.5 reach 99.31 and 99.75%, respectively, while a low-filtration resistance
(42 Pa) and a quality factor of up to 0.122 Pa–1 are achieved. This work has improved the application potential of
high-performance air-purification devices to remove particulate pollution
and may provide useful insights to design next-generation air filters
suitable for application in high-air humidity.
Excellent
triboelectric charge density and hydrophobicity are achieved
on cellulose nanofibrils (CNFs) by employing a simple and environmentally
friendly approach to aminosilane modification of a CNF film. The positive
charges on the CNF surface obtain gigantic enhancement, and a CNF-based
triboelectric nanogenerator (TENG) with enhanced performance and moisture
resistance is prepared. The performance of this functional CNF-based
TENG can show outstanding output stability when the environmental
humidity is 70%. Meanwhile, this TENG can respond to a variety of
human activities, including pressing, stretching, bending, and twisting,
indicating outstanding flexibility, and it can still be used to monitor
the state of human movement in a human sweat environment. This work
is expected to provide more insights and possibilities for application
of such a functional CNF-based TENG in self-powered wearable electronics.
Tactile sensors with visible light feedback functions, such as wearable displays and electronic skin and biomedical devices, are becoming increasingly important in various fields. However, existing methods cannot meet the application requirements for the tactile perception of intensity feedback and extended intersection due to their limited light‐mapping performance and insufficient portability. Herein, a freely constructible self‐powered visual tactile sensor is proposed, which consists of a high‐output triboelectric nanogenerator (TENG) and a visual light source. The transferred charge of the TENG is enhanced to 746 nC by the structural design of the triboelectric material and device, which can easily drive the light source to generate a light signal with a brightness of 9.8 cd m−2. Notably, the application of the TENG enables to realization visual sensing of the palm‐grasp state and strength feedback without an external power supply. This visual feedback and power‐free tactile sensors are expected to have potential application in the field of artificial intelligence as a new interactive medium for smart protective clothing and robotics.
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