ADVANCED FUNCTIONAL MATERIALS
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2022
·Vol. 32
·期 31
·2201230
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IF 19.924
Xingkui Guo,Fan Yang,Xiaolu Sun,Yujiao Bai,Guanjun Liu,Wenbo Liu,Rongguo Wang,Xiaodong He
The development of next-generation touch panels requires sensors that are highly sensitive, biocompatible, transparent, stretchable, self-healing, and even anti-freezing and self-powered because the traditional touch panel based on stiff and brittle electrodes faces many challenges. Conductive hydrogels hold great promise as sensing materials for the new-generation touch panel. However, most hydrogel-based touch panels are developed based on single-function gel materials with a lack of the anti-freezing and self-power capabilities. Herein, the authors demonstrate a multi-functional surface-capacitive touch panel based on a triboelectric nanogenerator with an instantaneous peak power density of 209 mW m −2 that uses zwitterionic network hydrogels as a highly transparent (98.1% transmittance), ultra-stretchable ( > 11 500% strain), degradable, and flexible ionic conductor. The panel can be utilized as a human-machine interactive interface with fast response, high resolution, low parasitic capacitance, functional recovery instantly upon damage, and without sacrificing its functionalities even in the high stretch state (1600% areal strain) and at the subzero environment ( <− 20 ° C). Epidermal touch panels are operated on arbitrary and complex surfaces, with outstanding input property demonstrated by writing, and playing computer games. Simultaneously, the multifunctional touch panel is degradable in phosphate buffered saline solution, and no pollution is caused.
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LWT-FOOD SCIENCE AND TECHNOLOGY
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2022
·
IF 6.056
Chun Yang,Jia-Hao Lu,Mei-Ting Xu,Xin-Chi Shi,Zhi-Wei Song,Tang-Min Chen,Daniela D. Herrera-Balandrano,Yun-Jiao Zhang,Pedro Laborda,Mahdi Shahriar,Su-Yan Wang
Strawberries are a widely consumed fruit that contains a variety of antioxidant metabolites. However, postharvest strawberries are highly perishable and susceptible to a variety of fungal pathogens. In this study, a chitosan-based coating containing turmeric (TU) and green tea (GT) extracts was developed and evaluated for the preservation of strawberries. Both TU and GT extracts contained high phenolic contents (>5.8 g kg −1 dry weight), but only TU extract showed strong antifungal activity. SEM observations revealed that high concentrations of extract (3–5% v/v ) caused the formation of agglomerates within the films, reduced elongation at break and increased tensile strength. The postharvest treatment of strawberries with chitosan coating containing TU extract inhibited the proliferation of Botrytis cinerea during 7 d of storage at 20 °C, whereas the coating containing GT extract extended the antioxidant properties of postharvest strawberries from 4 to 8 d at 20 °C. Sensory analysis indicated that the coatings did not significantly affect flavor and taste. Overall, TU extract was used for the first time for food packaging purposes and proved to be a great complement to the antioxidant properties of GT to extend the shelf-life of postharvest strawberries.
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FOOD CHEMISTRY
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2022
·
IF 9.231
Xizhe Fu,Yinglin Du,Ligen Zou,Xingquan Liu,Yihan He,Yanqun Xu,Li Li,Zisheng Luo
In present work, green and efficient glycerol solvent system was coupled with pulse-probe ultrasonication for one-step extraction and preservation of anthocyanin from blueberry pomace. Under optimal conditions (40 min, 174 W, 18.6 mL/g, 20% of glycerol fraction), extraction yield was 23.07 ± 0.09 mg C3GE/g DW. The extracted anthocyanins were characterized by UPLC-Triple-TOF/MS and 10 anthocyanins compounds were tentatively identified. Stability of anthocyanins influenced by solvents were evaluated in varying temperature, pH and light exposure conditions, demonstrating higher stability of anthocyanins in glycerol solvent system than methanol one. Furthermore, mechanism of high efficiency extraction and stability of anthocyanin using glycerol were investigated by quantum chemical calculation with molecular dynamic simulation. Larger solvent accessible surface area (127.16 nm 2 ), hydrogen bonds number (228.16) and hydrogen bonds lifetime (4.35 ps), and lower intermolecular interaction energy (-1080.48 kJ/mol) between anthocyanin and glycerol were responsible for better extraction and preservation of anthocyanins using glycerol system.
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Journal of Energy Storage
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2022
·
IF 8.907
Sensen Yu,Jie Xu,Cuili Xiang,Yongjin Zou,Zhicong Hu,Fen Xu,Lixian Sun
Transition metal sulfide porous multishell nanostructures with high active sites have great potential for application as bifunctional materials. Herein, bifunctional metal-organic framework (MOF)-derived nitrogen-doped porous multishell CuCoS@NiCoS (N–CCS@NCS) nanospheres are synthesized on Cu–Co–O substrates. The tightly connected nanocluster particles transformed by MOFs have more active sites and surface area. The ion transport efficiency between the shell layers is improved and the resistance to ion transport is further reduced. Moreover, the porous multishell structure provides a buffer space for the shock generated by multiple rapid embedding/de-embedding of OH − ions and offered a stable structure. Interestingly, the number of shell layers, thickness, spacing, and shell density of the N–CCS@NCS nanospheres can be controlled by adjusting the Ni content. Owing to its compositional and structural advantages, the N–CCS@NCS electrode exhibited a high specific capacitance of 1259 F g −1 at 0.5 A g −1 . The assembly N–CCS@NCS//activated carbon asymmetrical supercapacitor exhibited specific energy of 87.3 W h kg −1 at 825 W kg −1 and a capacitance retention rate of 81.3 % after 8400 cycles. Furthermore, the N–CCS@NCS electrocatalyst exhibited outstanding hydrogen precipitation properties (254 mV at 10 mA cm −2 ) in 1 M KOH and excellent stability over 20 h. Therefore, MOF-derived porous multishell metal sulfides are promising candidates for supercapacitor and hydrogen evolution reaction dual applications.
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Nano Energy
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2022
·
IF 19.069
Yunyi Chen,Leying Qing,Tongtong Liu,Shuangliang Zhao,Yongsheng Han
Supercapacitors as energy carriers have the advantages of high-power efficiency and long-term stability. An improvement of their energy density promises a solution to make up for the weakness of secondary batteries at a high rate of applications. Here we report an attempt to improve the energy density of supercapacitor by tuning ions arrangement at the electrode-electrolyte interface. Upon the theoretical analysis with classical density functional theory (CDFT), we find that the capacitance of the supercapacitor is maximized at a mediate concentration of electrolytes, i.e., 1.0 M, where ions accumulate near the electrode surface and display a few multilayered oscillatory distributions. Further, by adjusting the dielectric constant of electrolyte solution and the electrode surface voltage, the interfacial ion distribution is tuned to optimize the energy density of supercapacitors. The theoretical results are corroborated by designed experiments, confirming the role of interfacial ion distribution in specific capacitance. This study shows that an appropriate interfacial ion distribution is beneficial to obtaining high capacitance, highlighting an unusual solution to improve the energy density of supercapacitors.
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Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 3
·2138-2153
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IF 11.806
Ding Zhaodong,Tian Zhongjian,Ji Xingxiang,Dai Hongqi,Si Chuanling
Inspired by the hydrophobic waxy layer structure on the back of the desert beetle, a super-hydrophobic material was prepared via the sol–gel silanisation of porous cellulose membrane (CM) using triethoxysilanes with different carbon chain lengths (R-siloxane) and (CH 3 CH 2 O) 4 Ti as a catalyst in 3 min. The R-siloxane CM was both super-hydrophobic and oleophilic (water contact angle (CA) > 150°, dodecane CA ≈ 0°) and resisted liquids with surface tensions as low as 15 mN·m −1 , correlated with the length of the R-siloxane and roughness of the CM. Instructed by the water collection behavior of the desert beetle, a pristine filter CM was added on the R-siloxane filter CM to accelerate separation of Span 80–stabilised water-in-oil emulsions by generating a surface energy gradient (SEG). The composite membrane with SEG separated the emulsions with higher surfactant concentrations and provided a higher efficiency up to 99.98% compared with single-layer R-siloxane membrane. This bio-inspired catalytic one-step approach for preparing R-siloxane cellulose composite membranes can potentially replace petroleum-based products for oil purification. Graphical Abstract Bio-inspired preparation of R-siloxane composite cellulose membrane with surface energy gradient for highly efficient water-in-oil emulsion separation.
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COMPOSITES PART B-ENGINEERING
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2022
·
IF 11.322
Xiaoming Wang,Xinliang Wang,Juanjuan Yin,Na Li,Zhenlin Zhang,Yawen Xu,Lexin Zhang,Zhihui Qin,Tifeng Jiao
MXene-based conductive hydrogels have attracted immense interest as sensing materials for flexible wearable sensors due to their mechanical flexibility and high sensitivity. However, the low stability of MXene in aqueous media severely deteriorates the performances of MXene-based conductive hydrogels. Meanwhile, for their applications in advanced sensors, high mechanical strength , good environmental stability, self-adhesiveness, multiple sensory function combined with biodegradability are vital but can be rarely met in one platform. Herein, we first prepare stable MXene/gelatin dispersion by encapsulating MXene with gelatin to hinder restacking and oxidation of MXene nanosheets in water. Based on the MXene/gelatin dispersion, a high-strength and conductive MXene-composited gelatin (MCG) organohydrogel with excellent environmental stability and self-adhesiveness is fabricated by simply soaking the MCG pre-hydrogel in tannic acid (TA) water/glycerol solution. This design allows the formation of both multiple supramolecular crosslinked interactions and water/glycerol binary solvent system. The prepared MCG organohydrogel derived from natural constituents exhibits outstanding mechanical properties (such as high tensile strength and stretchability), excellent freezing resistance, moisturizing retention properties and self-adhesiveness, yet degrades fully when disposed. The resultant MCG hydrogel-based versatile sensors exhibit both high strain-sensitivity and thermosensitive capacities, realizing the application in the measurement of human motion and body temperature, providing a promising route to fabricate degradable sensing materials combined with all the favourable attributes for advanced electronics.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Lijun You,Xinming Shi,Jing Cheng,Jinhao Yang,Caihua Xiong,Zifeng Ding,Zhijuan Zheng,Shaoyun Wang,Jianhua Wang
Conductive hydrogel-based flexible electronics have attracted immense interest in wearable sensor , soft robot and human–machine interface. However, the application of hydrogels in flexible electronics is limited by the deterioration of mechanical and electrical properties due to freezing at low temperature and desiccation after long-term use. Meanwhile, flexible electronics based on hydrogel are usually not breathable, which has a great impact on wearing comfort and signal stability in long-term sensing. In this work, an adjustable porous gelatin/polypyrrole/reduction graphene oxide (Gel/PPy/rGO) organohydrogel with high breathability (14 g∙cm −2 ∙h −1 ), conductivity (5.25 S/m), mechanical flexibility, anti-freezing and long-term stability is prepared via the combination method of biological fermentation and salt-out toughening crosslinking. The sensor fabricated from the prepared porous organohydrogel exhibits excellent sensing sensitivity, fast response ability, and good endurance, which monitors both weak and intense human activities effectively like finger bending, elbow bending, walking and running, and tiny pulse beating. A pressure sensor array prepared from the porous organohydrogel detects pressure variation in 2D sensitively. Furthermore, the porous organohydrogel is utilized as flexible electrodes for the accurate collection and recognition of human physiological signals (EMG, ECG) and as an interface between human and machine.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hongsen Niu,Yuke Chen,Eun-Seong Kim,Weijia Zhou,Yang Li,Nam-Young Kim
The development of capacitive tactile sensors with both ultrasensitivity and ultrafast response/relaxation is crucial for the development of intelligent healthcare monitoring technology. Despite the significant improvement in the sensing performance presented by the introduction of microstructures into the dielectric or electrode layers, meeting the demands of intellectualization remains a major challenge. Herein, a strategy to simultaneously introduce microstructures in both the dielectric and electrode layers is developed. The hierarchical sea-urchin TiO 2 particle-in-micropore (HSP-MP) structure in the dielectric layer induces stress concentration near the micropore regions, significantly enhancing the sensitivity and toughness of the device. The sparsely spaced large microcone improves the sensitivity of the hierarchical microcone (HM) structure in the electrode layer, while the small microcone reduces the hysteresis caused by interfacial adhesion. With the synergistic effect of the HSP-MP&HM structure, the proposed tactile sensor achieves ultrasensitivity of 10.5 kPa −1 , ultrafast response/relaxation time of 5.6/5.6 ms, and ultralow limit of detection of 0.1 Pa. These sensing properties are demonstrated in practical applications, including tiny signal perception of the human fingertip pulse, tiny muscle motion perception for Morse code transmission, and high-resolution flexible perception array with pressure mapping capability.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 33
·15959-15966
·
IF 3.925
Kai Zong,Ke Li,Ziyue Zhou,Lei Gong,Dongshun Deng
The uptake of NH3 in the industrial tail gas will improve the environmental quality for human health and ecology. Adsorption separation has the advantages of simple operation and low energy consumption. However, the relatively low adsorption capacity severely hinders its practical utilization. In this work, four glycerol-based deep eutectic solvents (DESs) were incorporated into porous silica gels (SGs) and Al2O3 with a large surface area and pore structure to form novel DES/SG and DES/Al2O3 composites. The obtained materials were systematically characterized by FTIR, SEM, BET, and TGA and further evaluated for NH3 adsorption. The results showed that the acidic GuSCN:Gly DES played an indispensable role for the high adsorption ability of the composite. 40 wt% GuSCN : Gly (1 : 3) DES/SG can capture 115.40 mg NH3 per gram adsorbent, which is better than most of the solid adsorption materials reported in the literature and even 30% higher than the original SG. The high adsorption capacity, outstanding thermal stability, and good reusability confirm the success of the present strategy. This study will provide a useful idea for designing DES-supported composites for NH3 separation applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Tian Wu,Weijun Zhou,Yuhui Quan,Minfeng Chen,Qinghua Tian,Xiang Han,Junling Xu,Jizhang Chen
Benefiting from excellent mechanical properties, large surface area, rich hydroxyl groups, good sustainability, etc., nanocellulose is highly promising for various applications. However, intense chemical treatment and long-term processing are usually required to fabricate nanocellulose. Herein, a new synthesis method of nanocellulose is developed by using ultraviolet light irradiation-assisted delignification and subsequent sonification. This method is more cost-effective, time-saving, and environmentally benign compared to most of previously reported synthesis methods of nanocellulose. The obtained nanocellulose contains a small amount of lignin, which is unfavorable for high-temperature stability and optimal transparency. However, a small amount of lignin is beneficial to mechanical properties and in-water stability. With this nanocellulose, flexible MnO 2 cathode film and hydrogel electrolyte are constructed and a quasi-solid-state zinc-ion battery is assembled. The battery exhibits 233.3 mAh g −1 after 1000 cycles at 1 A g −1 and 20 ℃. And more than half of that capacity can be maintained at –20 ℃. The battery also possesses great rate capability and good endurance to external forces. This work provides new insights into the synthesis and application of nanocellulose.
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MACROMOLECULES
·
2022
·
IF 6.057
Lixian Song,Shalin Patil,Yingze Song,Liang Chen,Fucheng Tian,Le Chen,Xueyu Li,Liangbin Li,Shiwang Cheng
Combining X-ray tomography and rheology, we investigate the nanoparticle (NP) clustering and viscoelastic properties of polymer nanocomposites (PNCs) with non-attractive polymer–NP interactions. X-ray tomography reveals linear and compact NP clusters with preferential orientations rather than tenuous NP clustering structures, highlighting the non-equilibrium nature of NP clustering and the influence of processing on morphology of NP clusters. Detailed analyses show that the number density of NP clusters of N NPs follows P(N) ≈ N–k exp(−N/N*) with N* as a constant and k ≈ 1.8 ± 0.2. Moreover, varying the polymer–NP interactions from strongly repulsive to nearly athermal does not alter noticeably the clustering and the percolation behavior of the NP phase. Linear viscoelastic measurements reveal negligible dynamics slowing down and unexpectedly weak mechanical reinforcement of PNCs following the classical Guth–Gold relation, in sharp contrast to the strong NP clustering from structure characterizations. These results point to qualitatively different clustering behaviors and mechanical reinforcement of PNCs with non-attractive polymer–NP interactions from those with strong attractive interactions.
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