Flexible hydroelectric generators (HEGs) are promising self‐powered devices that spontaneously derive electrical power from moisture. However, achieving the desired compatibility between a continuous ...operating voltage and superior current density remains a significant challenge. Herein, a textile‐based van der Waals heterostructure is rationally designed between conductive 1T phase tungsten disulfide@carbonized silk (1T‐WS2@CSilk) and carbon black@cotton (CB@Cotton) fabrics with an asymmetric distribution of oxygen‐containing functional groups, which enhances the proton concentration gradients toward high‐performance wearable HEGs. The vertically staggered 1T‐WS2 nanosheet arrays on the CSilk fabric provide abundant hydrophilic nanochannels for rapid carrier transport. Furthermore, the moisture‐induced primary battery formed between the active aluminum (Al) electrode and the conductive textiles introduces the desired electric field to facilitate charge separation and compensate for the decreased streaming potential. These devices exhibit a power density of 21.6 µW cm−2, an open‐circuit voltage (Voc) of 0.65 V sustained for over 10 000 s, and a current density of 0.17 mA cm−2. This performance makes them capable of supplying power to commercial electronics and human respiratory monitoring. This study presents a promising strategy for the refined design of wearable electronics.
Through constructing 2D nanosheet arrays and moisture‐induced primary battery system, a high‐performance and flexible hydroelectric generator is developed with a sustained open‐circuit voltage of 0.65 V, and an excellent short‐circuitcurrent of 0.51 mA. Moreover, these prepared flexible hydroelectric generators can be used in the wearable self‐powered field.
Textile‐based generators that can convert low‐grade energy from the human body or environment into sustainable electricity have generated immense scientific interest in self‐powered wearable ...applications. However, their low power density and environmental suitability have extremely restricted their portable applications in complex and mutable environments. Herein, an asymmetric sandwich structure between molybdenum disulfide (MoS2)‐carbonized silks (MCs) and MoS2/MXene–Cottons (MMCs) to construct efficient thermo–hydroelectric generators (THEGs) that synergistically harvest heat‐moisture energy to generate considerable electricity is rationally designed. Notably, the large surface area of MoS2/MXene van der Waals heterojunctions (vdWhs) enables efficient charge collection, and the vertical MoS2 nanosheet arrays supply abundant nanochannels for a highly efficient hydration effect, generating an output power density of 32.26 µW cm−2 after wetting with deionized water. Combined with the sensitive temperature recognition ability with a Seebeck coefficient of 23.5 µV K−1, the application possibilities of these prepared THEGs in the mutual conversion of fingertip temperature/language, and the monitoring of the human physiological state is foresee.
Thermo–hydroelectric generators (THEGs) are successfully constructed based on a sandwich structure between p‐type MoS2‐carbonized silks (MCs) with vertical MoS2 nanosheet arrays and n‐type MoS2/MXene–Cottons (MMCs) with van der Waals heterojunctions, demonstrating a Seebeck coefficient of 23.5 µV K−1 and a high output power density of 32.26 µW cm−2, which are favorable acting as self‐powered sensors for health monitoring.
Gynura procumbens is a traditional herb and food extensively cultivated in China and Southeast Asian countries. This study was designed to determine the content of the main chemical components and ...elucidate the antioxidant and anti-inflammatory capacity of G. procumbens flowers extracts (GPFE). GPFE was rich in flavonoids and phenolics and exhibited great reducing power as well as strong scavenging ability of ABTS
+
and DPPH radicals. The pro-inflammatory factors including IL-6, IL-1β, NO, TNF-α, PGE
2
and their mRNA transcriptions were strongly inhibited with the treatment of GPFE in LPS-stimulated RAW264.7 macrophages. Meanwhile, GPFE could attenuate the inflammation via suppressing the nuclear translocation of NF-κB p65 and downregulating the MAPK signalling pathways. Furthermore, isochlorogenic acid B, isochlorogenic acid A and isochlorogenic acid C isolated from GPFE all had a high content and showed potent anti-inflammatory activities. Our findings suggest that GPFE could be used as a natural anti-inflammatory agent.
Polygonum multiflorum
Thunb. is a traditional herb which was widely distributed in China. The leaves of
P. multiflorum
(PML), which contains lots of antioxidant constituents, are often used for tea. ...In this study, three flavonoid glycosides were successfully separated and characterized from the ethyl acetate fraction of 80% ethanol extracts of PML by high-speed counter-current chromatography (HSCCC). The biphasic solvent system which can isolate purified myricitrin (44.5 mg), quercitrin (23.86 mg) and afzelin (14.39 mg) from 110 mg of the ethyl acetate fraction of PML was composed of
n
-hexane–ethyl acetate–methanol–water (0.5:3:1:2, v/v/v/v). Moreover, the purities of each compound were 94.9, 97.0, and 95.7% as determined by high-performance liquid chromatography (HPLC), respectively. Three flavonoid glycosides were obtained using only one-step HSCCC separation for the first time and the chemical structures of these three compounds were identified using the techniques of NMR and ESI–MS. The antioxidant activities of these three compounds, ethyl acetate fraction, and crude extract were evaluated by three antioxidant assays. The results of antioxidation assays showed that myricitrin and quercitrin have strong antioxidant activity and the two components may be the material basis of the antioxidant potential of PML. This work confirmed the feasibility of HSCCC to separate compounds from complex samples and it suggests that PML have pharmaceutical potential as natural antioxidant agents.
Flexible moisture–electric generators (MEGs) capture chemical energy from atmospheric moisture for sustainable electricity, gaining attention in wearable electronics. However, challenges persist in ...the large-scale integration and miniaturization of MEGs for long-term, high-power output. Herein, a vertical heterogeneous phase-engineering MoS2 nanosheet structure based silk and cotton were rationally designed and successfully applied to construct wearable MEGs for moisture–energy conversion. The prepared METs exhibit ∼0.8 V open-circuit voltage, ∼0.27 mA/cm2 current density for >10 h, and >36.12 μW/cm2 peak output power density, 3 orders higher than current standards. And the large-scale device realizes a current output of 0.145 A. An internal phase gradient between the 2H semiconductor MoS2 in carbonized silks and 1T metallic MoS2 in cotton fibers enables a phase-engineering-based heterogeneous electric double layer functioning as an equivalent parallel circuit, leading to enhanced high-power output. Owing to their facile customization for seamless adaptation to the human body, we envision exciting possibilities for these wearable METs as integrated self-power sources, enabling real-time monitoring of physiological parameters in wearable electronics.
The immobilization of Hg0 and detoxication of Hg-containing composites are enormous challenges for Hg pollution control, which provide a high requirement for the design and synthesis of materials. ...Herein, a new composite with halloysite, selenium, and transition metals as raw materials (FeCo-LDH/HNTs@Se) for a Hg0 trap was designed by precipitation with ion exchange and an in situ selenization method. Intrinsic features such as high affinity, microwave permittivity (109–1012), large surface area, abundant pores, and many active components favored Hg0 removal and immobilization. The removal performance, flue gas tolerance, and synergistic effect of active components were improved greatly when microwave was added. The study indicated that (1) the Hg0 removal efficiency of the composite could reach 99.4%; (2) the composite had excellent tolerance to different industries’ flue gases. The electron exchange of Co(II)/Co(III) and Fe(II)/Fe(III) and the existence of Se and SeO2 were important for Hg0 immobilization. HgSe was the main adsorption product based on both X-ray photoelectron spectroscopy (XPS) and an online lab-built thermal decomposition system (TPD-AFS) analysis, which made the used-materials possess low mercury leaching content (0.09 mg·L –1 ) lower than the US EPA regulatory value (0.2 mg·L–1). This work provides a sound way for mercury control, which is significant for environmental protection.
Multifunctional and long-term stable wearable heating systems have attracted extensive attention from experts, yet smart textiles that only rely on harvesting the body’s heat without additional ...energy still face huge challenges in practical applications. Herein, we rationally prepared the monolayer MXene Ti3C2T x nanosheets via an in situ hydrofluoric acid generation method, which was further employed to construct a wearable heating system of MXene @ polyester polyurethane blend fabrics (MP textile) for the passive personal thermal management through a simple spraying process. Owing to the unique two-dimensional (2D) structure, the MP textile presents the desired mid-infrared emissivity, which could efficiently suppress the thermal radiation loss from the human body. Notably, the MP textile with an MXene concentration of 28 mg/mL exhibits a low mid-infrared emissivity of 19.53% at 7–14 μm. Significantly, these prepared MP textiles demonstrate an enhanced temperature of more than 6.83 °C compared with those of favorably traditional fabrics, involving the black polyester fabric, pristine polyester polyurethane blend fabric (PU/PET), and cotton, suggesting a charming indoor passive radiative heating performance. The temperature of real human skin covered by MP textile is 2.68 °C higher than that covered by cotton fabric. Impressively, these prepared MP textiles simultaneously possess attractive breathability, moisture permeability, mechanical strength, and washability, which provide new insight into human body temperature regulation and physical health.
Flexible hydroelectric generators (HEGs) are promising self-powered devices that spontaneously derive electrical power from moisture. However, achieving the desired compatibility between a continuous ...operating voltage and superior current density remains a significant challenge. Herein, a textile-based van der Waals heterostructure is rationally designed between conductive 1T phase tungsten disulfide@carbonized silk (1T-WS
@CSilk) and carbon black@cotton (CB@Cotton) fabrics with an asymmetric distribution of oxygen-containing functional groups, which enhances the proton concentration gradients toward high-performance wearable HEGs. The vertically staggered 1T-WS
nanosheet arrays on the CSilk fabric provide abundant hydrophilic nanochannels for rapid carrier transport. Furthermore, the moisture-induced primary battery formed between the active aluminum (Al) electrode and the conductive textiles introduces the desired electric field to facilitate charge separation and compensate for the decreased streaming potential. These devices exhibit a power density of 21.6 µW cm
, an open-circuit voltage (V
) of 0.65 V sustained for over 10 000 s, and a current density of 0.17 mA cm
. This performance makes them capable of supplying power to commercial electronics and human respiratory monitoring. This study presents a promising strategy for the refined design of wearable electronics.
Electronic textiles present an enticing prospect for personal health assessment and physical monitoring, owing to their strong stretchability, high flexibility, mechanical robustness and high ...capacity in sensing small deformations in human motions. Herein, a multifunctional robust flexible knitting-shaped strain sensor based on the functional heterostructure composed of the conductive MXene (Ti
3
C
2
T
x
) nanosheet and the antimicrobial Cu
2
O nanoparticles is prepared via a solution-processable dip-dry coating approach. The textile-based strain sensor exhibits a highly stable and immediate response over a wide range, which shows great advantages in detecting and monitoring human activities, such as smiling, swallowing, and wrist/finger/joint bending. Significantly, these prepared strain sensors present a promising application in smart wear, which was typically employed as the smart sensing gloves in barrier-free communication for hearing-impaired people. Interestingly, the different resistance evolutions of the knitted sensor under both low and high strain were carried out to study the sensing mechanism for the first time. Notably, the strain sensor displays a reliable antibacterial efficiency of ∼99.1% for
Escherichia coli
and outstanding breathability as high as 190 mm/s. This developed MXene/Cu
2
O hybrid materials supplies a new insight for the rational design and synthesis of multifunctional nanomaterials, as well as the achievement of the flexible wearable sensor with high performance.
Graphical abstract
Gynura procumbens is a traditional herb and food extensively cultivated in China and Southeast Asian countries. In this work, the crude extract (CE) of G. procumbens was purified with macroporous ...resin to obtain the refined fraction, and its anti-inflammatory activity was compared with that of CE. Moreover, the detailed mechanisms of anti-inflammatory activity were also investigated for the first time. The results indicated that CE was more effective in anti-inflammatory activity and it could reduce the secretion of NO, TNF-α, and PGE2 via decreasing the iNOS, TNF-α, and COX-2 genes transcription and related proteins translation, which were associated with the inhibition of AP-1 and NF-κB nuclear translocation and downregulation of PI3K/Akt and MAPK signaling pathways. In conclusion, the extract of G. procumbens has a promising potential in inflammation-related disorders alleviation, and these findings could provide the basis for the comprehensive utilization of G. procumbens and the new functional food development.
