Fiber-based strain sensors have become a vital part for
wearable
electronics owing to their lightweight, flexibility, and easy processing.
A poly(styrene-butadiene-styrene) (SBS)/MXene composite and coaxial
fiber-based strain sensors were produced through a continuous, facile,
and scalable wet-spinning approach, which exhibited both high stretchability
and sensitivity. Electromechanical properties displayed that SBS/MXene
composite fibers showed extremely high sensitivity (1.63 × 104), low strain detection (0.5%), and outstanding durability
and reliability, which laid a foundation for detecting human motion
including subtle activities, such as breathing and wrist pulse, and
large-scale activities, such as bending of limb joints. The strain-sensing
performance was further investigated by SBS/MXene coaxial fibers with
SBS/MXene as sheath and SBS as core, presenting high sensitivity (4.69
× 103) and repeatability. SBS/MXene composite and
coaxial fiber sensors demonstrated the potential application in wearable
electronics with human motion detection.
The fibers reinforced thin architectural ceramic plate of 900 mm×1800 mm×2.5 mm with high mechanical property was prepared by a fast-sintering method with a controllable fiber dispersion process. The effects of ball-milling time to the dispersity, average length-diameter ratio and microstructure of alumina fibers were investigated respectively. Meanwhile, the alumina fiber contents to the volume density, water absorption, phase transformation and microstructure of the thin ceramic plate were researched. It is found that the two-steps ball-milling process can control the average length-diameter ratio of the alumina fibers effectively and achieve a well dispersion mixture of fibers and ceramic powders, the fast-sintering method is beneficial for the protection of fiber/matrix interface. The trend of the volume density and bending strength increases with the fiber content from 0 wt% to 5 wt% and then decreases with the fiber content from 5 wt% to 15 wt%. The bending strength of this composite reaches the maximum value of 146.8 MPa with the fiber content is 5 wt%, which is corresponding to the strengthening of alumina fibers and the formation of mullite crystallization in fiber/matrix interface and matrix during the fast-sintering process.
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