Polymers
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2022
·Vol. 15
·期 1
·190
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IF 4.967
Qian Sun,Xu Gao,Sai Wang,Rong-Yue Shao,Xin-Yu Wang,Jun-Feng Su
The aging and damage of artificial skin materials for artificial intelligence robots are technical problems that need to be solved urgently in their application. In this work, poly (vinylidene fluoride) (PVDF) fibers containing a liquid agent were fabricated directly as biomimetic microvasculars, which were mixed in a glycol–polyvinyl alcohol–gelatin network gel to form biomimetic self-healing artificial skin composites. The self-healing agent was a uniform-viscous buffer solution composed of phosphoric acid, acetic acid, and sodium carboxymethyl cellulose (CMC-Na), which was mixed under 40 °C. Microstructure analysis showed that the fiber surface was smooth and the diameter was uniform. SEM images of the fiber cross-sections showed that there were uniformly distributed voids. With the extension of time, there was no phenomenon of interface separation after the liquid agent diffused into the matrix through the fiber cavity. The entire process of self-healing was observed and determined including fiber breakage and the agent diffusion steps. XRD and FT–IR results indicated that the self-healing agent could enter the matrix material through fiber damage or release and it chemically reacted with the matrix material, thereby changing the chemical structure of the damaged matrix. Self-healing behavior analysis of the artificial skin indicated that its self-healing efficiency increased to an impressive 97.0% with the increase in temperature to 45 °C.Keywords:self-healing;artificial skin composite;fiber;healing agent
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JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Wenjie Sun,Qingyi Liu,Jiateng Zhao,Hafiz Muhammad Ali,Zafar Said,Changhui Liu
With the development of electronic machinery, the traditional heat exchange working fluid can no longer be used in some extreme working environments. As a new type of fluid, deep eutectic solvent has the advantages of promising thermal stability, low cost and non-toxicity through the hydrogen bond association of hydrogen bond acceptor and hydrogen bond donor, and is also coined to be an efficient heat transfer working fluid. In this work, three kinds of nanofluids filled with TiO 2 , Al 2 O 3 and Fe 2 O 3 nanoparticles were prepared with glycerol/sodium acetate trihydrate deep eutectic solvent as the base solution, and the mechanism of thermal conductivity change of nanofluids were discussed from atomic and microscopic levels. The experimental results showed that the prepared glycerol/ sodium acetate trihydrate 2:1 deep eutectic solvent system reduced the viscosity by 58.03% compared with glycerol, and increased the thermal conductivity by 17.2% compared with glycerol at 25 ℃. The effects of nanoparticles on thermal conductivity and specific heat capacity were also investigated. Compared with deep eutectic solvent, the thermal conductivity was improved after adding Fe 2 O 3 nanoparticles; it is worth noting that the specific heat capacity of nanofluids was more than doubled after adding nanoparticles.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Jiaji Yue,Siying Zhou,Xingxiang Ji,Chunqi Jiao,Yi Cheng,Yehan Tao,Jie Lu,Jian Du,Haisong Wang
Robust biopolymer-based composite film with multifunctional performances significantly contributes to the packaging field. Herein, we proposed a sort of carboxymethyl cellulose (CMC) based composite film via incorporating versatile zeolitic imidazolate framework (ZIF) materials. Compared to pristine CMC film, the OTR, WVTR, and tensile strength of CMC/ZIF composite film with 1 wt ‰ Zn/Co-ZIF were improved from 64.89 cm 3 *μm/(m 2 *d*kPa), 1579.21 g/(m 2 *24h) and 16.9 MPa to 20.79 cm 3 *μm/(m 2 *d*kPa), 1209.58 g/(m 2 *24h) and 70.1 MPa, respectively. Notably, owing to the reduced band gap and intrinsic chemical and thermal stability of Zn/Co-ZIF, the fabricated Zn/Co-ZIF/CMC composite film presented well UV protection capability within the whole UV region and excellent UV-blocking durability after being exposed to UV-light at 365 nm for 12 h. In practice, the photocatalytic degradation of RhB solutions under UV light could be effectively suppressed when using Zn/Co-ZIF/CMC film as UV protection layer. Our findings proposed the potential application of these versatile ZIF materials as functional nanofiller within biopolymer substances for UV protection and transparent packaging area.
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2023
·Vol. 44
·期 8
·2200928
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IF 4.6
Xiaotong Wei,Jie Li,Zhirui Hu,Chen Wang,Zhiqiang Gao,Yang Cao,Jing Han,Yingchun Li
In recent years, hydrogels have attracted extensive attention in smart sensing owing to their biocompatibility and high elasticity. However, it is still a challenge to develop hydrogels with excellent multiple responsiveness for smart wearable sensors. In this paper, a facile synthesis of carbon quantum dots (CQDs)-doped cross-linked chitosan quaternary/carboxymethylcellulose hydrogels (CCCDs) is presented. Designing of dual network hydrogels decorated with CQDs provides abundant crosslinking and improves the mechanical properties of the hydrogels. The hydrogel-based strain sensor exhibits excellent sensitivity (gauge factor: 9.88), linearity ( R 2 : 0.97), stretchable ability (stress: 0.67 MPa; strain: 404%), good cyclicity, and durability. The luminescent properties are endowed by the CQDs further broaden the application of hydrogels for realizing flexible electronics. More interestingly, the strain sensor based on CCCDs hydrogel demonstrates photo responsiveness (Δ R / R 0 ≈20%) and pH responsiveness (pH range ≈4–7) performance. CCCDs hydrogels can be used for gesture recognition and light sensing switch. As a proof-of-concept, a smart wearable sensor is designed for monitoring human activities and detecting pH variation in human sweat during exercise. This study reveals new possibilities for further applications in wearable health monitoring.
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Journal of Energy Storage
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2023
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IF 9.4
Xin Xu,Shang Wu,Yang Liu,Chaoyang Liu,Xin Sun,Shuo Tian,Lan Wu,Yuzhi Sun,Zhichao Wang,Quanlu Yang
The tubular microsphere structure is an effective structure for asymmetric supercapacitors due to its high specific surface area and porosity. It can slow down the volume shrinkage caused by redox process. In this paper, tubular-like NiMoO 4 ·xH 2 O microspheres were designed to reach a high specific capacity. The NiMoO 4 ·xH 2 O was prepared by hydrothermal method and subsequent annealing treatment showed a tubular microsphere structure with many particles uniformly distributed. And its specific capacity is 943 F g −1 at 1 A·g −1 and capacity retention is 73.4 % after 3000 cycles. The Bi 2 S 3 /C was selected as negative material to build an asymmetric supercapacitor (battery-type device). It exhibited an impressive specific capacity (419 F g −1 at 1 A g −1 ). It was worth noting that the battery-type devices built with NiMoO 4 ·xH 2 O and Bi 2 S 3 /C can achieve a specific energy of 27.1 Wh kg −1 at 2456.9 W kg −1 and capacity retention of 69.2 % after 5000 cycles. It was shown that NiMoO 4 -xH 2 O and Bi 2 S 3 /C as electrode materials have great potential and can enhance the energy storage application of supercapacitors.
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ACS Nano
·
2023
·
IF 17.1
Chuan Tang,Yilong Jiang,Lei Chen,Junhui Sun,Yangqin Liu,Pengfei Shi,Jose Yesid Aguilar-Hurtado,Andreas Rosenkranz,Linmao Qian
The mechanical performance and surface friction of graphene oxide (GO) were found to inversely depend on the number of layers. Here, we demonstrate the non-monotonic layer-dependence of the nanowear resistance of GO nanosheets deposited on a native silicon oxide substrate. As the thickness of GO increases from ∼0.9 nm to ∼14.5 nm, the nanowear resistance initially demonstrated a decreasing and then an increasing tendency with a critical number of layers of 4 (∼3.6 nm in thickness). This experimental tendency corresponds to a change of the underlying wear mode from the overall removal to progressive layer-by-layer removal. The phenomenon of overall removal disappeared as GO was deposited on an H-DLC substrate with a low surface energy, while the nanowear resistance of thicker GO layers was always higher. Combined with density functional theory calculations, the wear resistance of few-layer GO was found to correlate with the substrate’s surface energy. This can be traced back to substrate-dependent adhesive strengths of GO, which correlated with the GO thickness originating from differences in the interfacial charge transfer. Our study proposes a strategy to improve the antiwear properties of 2D layered materials by tuning their own thickness and/or the interfacial interaction with the underlying substrate.
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ACS Applied Materials & Interfaces
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2023
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IF 9.5
Huijing Li,Long Li,Hao Zhang,Junjie Wei,Zhenyu Xu,Tao Chen
To make soft robotics intelligent, dazzling artificial skin and actuators have been created. However, compared to rigid commercial robots, the sophisticated demands of raw materials become a key challenge for autonomous soft actuators to realize manufacturing repeatability and reproducibility. Inspired by the stem cell, which has the potential to differentiate into multifunctional cells with the same original compositions, a potential multifunctional gel is presented. With well-designed polymer chains, the gel has a salt-induced regulating module, conductivity, and other bionic properties. Making use of this advantage, the gel acts as a double-duty electrode for both the actuator and sensor. An artificial reflex arc is therefore formed by their tight integration via an e-brain: a computing unit that specifically responds to organism intervention. This efficient strategy to obtain diverse components with minimal raw materials is promising for effortlessly fabricating fully soft robotics.
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MATERIALS & DESIGN
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2023
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IF 8.4
Jiawei Lu,Xiaokun Fan,Jiawei Hu,Jie Li,Jingjing Rong,Weijia Wang,Ying Chen,Wenyong Liu,Jin Chen,Yi Chen
The main limit of hydrogel used as an independent wound dressing is its poor water retention, brittleness, and weak skin adhesion. Focusing on it, the macromolecular cross-linked chitosan and polyacrylamide double network hydrogel (C-A) is chosen as a functional layer, another robust poly(vinyl alcohol)-polyacrylamide/glycerin (P-A) protective layer is designed to cover its surface, an interfacial reaction happens to link two layers tightly for achieving the function synergy. In this double-layer hydrogel (DH) dressing, the surface P-A layer with strong water locking ability could keep the wound surface moist for a long time, high strength and toughness make the dressing maintain integrity under large deformation and stress to strengthen wound protection, and the C-A layer with modest adhesion ensures the dressing fit the skin, the synergistic swelling ability could guarantee the fast absorption for the wound exudate. Moreover, in vitro and in vivo tests, the DH dressing exhibits excellent antibacterial and cytocompatibility, it could significantly accelerate skin tissue regeneration and wound closure than the commercial hydrocolloid dressings. In general, this DH dressing is easy to prepare and shows superior comprehensive performance, revealing the great potential for use as an independently applied wound dressing.
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 44
·期 5
·2200765
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IF 5.006
Yanlong Yin,Yang Xu,Xuhao Zhang,Baorong Duan,Zhirong Xin,Chunyang Bao
The development of degradable polymeric materials such as degradable polyurethane or polyurea has been much highlighted for resource conservation and environmental protection. Herein, a facile strategy of constructing mechanically strong and tough poly(urea-urethane) (PUU) thermosets that can be degraded under mild conditions by using triple boron-urethane bonds (TBUB) as cross-linkers is demonstrated. By tailoring the molecular weight of the soft segment of the prepolymers, the mechanical performance can be finely controlled. Based on the cross-linking of TBUB units and hydrogen-binding interactions between TBUB linkages, the as-prepared PUU thermosets have excellent mechanical strength of ≈40.2 MPa and toughness of ≈304.9 MJ m −3 . Typically, the PBUU900 strip can lift a barbell with 60 000 times its own weight, showing excellent load-bearing capacity. Meanwhile, owing to the covalent cross-linking of TBUB units, all the PUU thermosets show initial decomposition temperatures over 290 °C, which are comparable to those of the traditional thermosets. Moreover, the TBUB cross-linked PUU thermosets can be easily degraded in a mild acid solution. The small pieces of the PBUU sample can be fully decomposed in 1 m HCl/THF solution for 3.5 h at room temperature.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Zhe Qiu,Fanjun Yu,Dan Xu,Zengbin Wang,Junya Huang,Shuo Wang,Yanxiao Yang,Yonggui Wang,Jian Li,Zefang Xiao,Yanjun Xie,Kai Zhang
Water-transport based on biomimetic self-propelled directional water transport materials have attracted wide attention but are limited by low transport speed, costly and complicated preparation, and scaling difficulty. By retaining native cellulose microfibril structure within wood cell walls and their controlled shrinkage, we constructed a self-propelling directionally water transporting wood (SDTW) by reshaping the cell wall to generate robust capillary forces due to aligned longitudinal hierarchical wood cell structures. Hierarchical structures containing directional parallel macro- and micro-sized ridge-groove structures and creating nano-voids are fabricated. They are further intactly fixed after reaction with maleic anhydride to improve the dimensional stability and environmental durability without changing the hydrophilicity on surface. Resulting SDTW exhibited an ultrafast water transport speed of 200.4 mm/s (∼260 % of Nepenthes alata showing a fast speed of 78 mm/s as a native structure) and water absorbing rate of 1.15 × 10 5 L/m 2 /h (over 4200-fold higher than that of natural wood). With these ultrafast water transport characters, SDTW was used as water manipulating systems for fast bottom to up transportation of liquid water at a rate of 193.5 mm/s, and as high fog harvesting system with an efficiency of 10.6 g/cm 2 /h. With its facility, durability, scalability, and sustainability, the SDTW demonstrates a new class of sustainable wood-based materials for practical water manipulation applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Muhammad Imran Jamil,Yuhang Cai,Waqar Ahmed,Xiaoli Zhan,Fengqiu Chen,Dangguo Cheng,Qinghua Zhang
Natural species use their surface structures for water harvesting. It is the dire need of the hour to learn from nature, mimic its functions, and solve the water scarcity problem through dew condensation . However, the present microscale and nanoscale approaches still suffer from complicated fabrication methods and durability failure in harsh conditions. Here, we introduce a bioinspired slippery surface of candle soot particles which uses its bumps to enhance the growth of condensed water droplets. The Namib desert beetles-inspired convex topography, cacti-inspired asymmetric slope, and Nepenthes pitcher plant-inspired slippery surface of soot particles synergistically combines the large droplet nucleation density, fast droplet coalescence, and easy removal of droplet from the surface. The hydrophilic SLIPS of soot particles harvests water at a rate of 326.4 ± 9 mg/cm 2 h -1 which is 70 % high as compared to hydrophobic SLIPS of soot particles. The fluorinated SLIPS reveals 32 % high water collection rate as compared to the methyl-terminated SLIPS of candle soot particles and the results are corroborated by calculating the intermolecular hydrogen bonding energies through DFT. The programmed motion of water droplet on a slippery surface of soot particles is also observed by applying laser light, heat, and magnetic field even against gravity. The slippery surface shows long-term stability due to nano-porosity, permeation of lubricant into soot particles and lubricant’s crosslinking ability with the binder. The developed surface is biocompatible, self-cleaning, and suitable for water harvesting particularly in cold and arid regions.
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Materials Today Nano
·
2023
·
IF 10.3
Sirui Li,Yingxue Wu,Xianhong Zhang,Dong Chen,Yuhong Ma,Wantai Yang
Eutectogels are compelling materials for flexible sensor owing to their intrinsic excellent ionic conductivity , biocompatibility, low fabricating expense and non-volatility. However, the design and preparation of robust eutectogel-based sensors with tunable mechanical and adhesive properties remains a challenge. Herein, we reported a facile one-pot method to fabricate high-performance eutectogels by copolymerization of two monomers with distinct electrolyte properties, acrylic acid (AA) and 2-(dimethylamino)ethyl methacrylate (DMAEMA). The copolymerization of AA and DMAEMA in deep eutectic solvent (DES) composed of choline chloride and glycerol could induce macroscopic phase separation, endowing the as-prepared PAA- co -PDMAEMA eutectogels with enhanced mechanical properties . By simply varying the mass ratio of AA to DMAEMA, biocompatible PAA- co -PDMAEMA eutectogels with high transparency (90 %), widely tunable mechanical properties (0.059–2.00 MPa), favorable conductivity (∼10 −2 S m −1 ), remarkable anti-freezing property (−93 °C) and low-temperature adhesion (1.13 MPa in −30 °C) could be successfully prepared. The strong PAA 2 - co -PDMAEMA eutectogel displayed potential as shape-memory materials, while the flexible PAA 4 - co -PDMAEMA eutectogel exhibited great prospect as multifunctional wearable sensor . More importantly, the eutectogel-based flexible sensor possessed excellent strain durability (∼1000 cycles) and high temperature sensitivity (up to −15 % °C −1 ), suggesting intensive potentials in wearable electronic devices. In view of the diversity of monomers and DESs, the one-pot copolymerization strategy can be applied to other electrolyte monomers and eutectogel systems, offering a feasible and generic design method to regulate eutectogel microstructures and properties.
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