ACS Nano
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2024
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IF 15.8
Xiaotong Fu,Zirong Liu,Chenlu Jiao,Pan Chen,Zhu Long,Dongdong Ye
Healthy, convenient, and aesthetic hair dyeing and styling are essential to fashion trends and personal–social interactions. Herein, we fabricate green, scalable, and aesthetic regenerated cellulose filaments (ACFs) with customizable iridescent colors, outstanding mechanical properties, and water-triggered moldability for convenient and fashionable artificial hairdressing. The fabrication of ACFs involves cellulose dissolution, cross-linking, wet-spinning, and nanostructured orientation. Notably, the cross-linking strategy endows the ACFs with significantly weakened internal stress, confirmed by monitoring the offset of the C–O–C group in the cellulose molecular chain with Raman imaging, which ensures a tailorable orientation of the nanostructure during wet stretching and tunable iridescent polarization colors. Interestingly, ACFs can be tailored for three-dimensional shaping through a facile water-triggered adjustable internal stress: temporary shaping with low-level internal stress in the wet state and permanent shaping with high-level internal stress in the dry state. The health, convenience, and green aesthetic filaments show great potential in personal wearables.
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PubMed
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Inorganic Chemistry Frontiers
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2024
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IF 6.1
Zongyi Wang,Jiuli Chang,Zhiyong Gao
Nitrate–methanol co-electrolysis involving the cathodic nitrate reduction reaction (NO3RR) combined with the anodic methanol oxidation reaction (MOR) is a viable way to synchronously produce ammonia (NH3) and formate via gentle, sustainable and energy-saving “E-refining” and “E-reforming” means. An efficient bifunctional catalyst for the NO3RR and MOR is pivotal to achieve such a goal. In this work, a nitrogen-doped carbon-encapsulated nickel iron phosphide hybrid (Ni2FeP@NC) was prepared as a bifunctional catalyst for the NO3RR and MOR, and its electrochemical performance for nitrate–methanol co-electrolysis was investigated. The Ni2FeP@NC catalyst exhibited a high NH3 yield (0.47 mmol h−1 cm−2 at −0.35 V) and faradaic efficiency (FE, 93% at −0.15 V) for the NO3RR and simultaneously demonstrated high MOR efficiency for formate production (yield of 1.62 mmol h−1 cm−2 at 1.7 V and FE of around 95%). The bifunctional catalytic features of the nitrate–methanol co-electrolysis system enabled the concurrent production of NH3 and formate at low input voltage. This work provides a viable paradigm for pairwise electrosynthesis of valuable chemicals via “E-refining” and “E-reforming” through the rational design of bifunctional catalysts.
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Analytical Methods
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2024
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IF 2.7
Linghui Tang,Yufeng Huang,Zhihuan Qian,Jifan Zhao,Yasushi Hasebe,Yan Dong,Yue Wang
In this study, a self-assembled electrochemical sensor was prepared by coating with a carbon nanotube (CNT) decorated hydrogel (HG) combined with electrodeposition of methylene blue (MB), and then used for the detection of ascorbic acid (AA). The three-dimensional network of HG has the advantages of large electroactive surface area, rapid diffusion and electron transfer rate, strong adhesive ability and stabilization of the polymerized MB. The MB provides high electrocatalytic activity and works as an electron transfer mediator to facilitate the oxidation of AA. The successful synthesis of the hydrogel and the preparation of the sensor are confirmed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The layer-by-layer assembly was identified by AFM with the heights of 22.1 nm and 186.8 nm for the hydrogel and MB layers, respectively. Under the optimal conditions, the sensor has a linear range of 0.1 mM to 10 mM and a detection limit of 0.05 mM. What's more, the prepared sensor also exhibits good stability (current retention of 91.22% after 100 cycles for testing 0.25 mM AA), excellent anti-interference ability, good reproducibility (RSD of 4.26% for five independent experiments), excellent operational stability (RSD of 1.66% for 30 consecutive AA additions), fast response time (<4 s) and shows satisfactory results in the detection of AA in vitamin C tablets.
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MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Longqing Xiong,Qing Xin,Guoqing Yang,Shangqing Liang,Jun Lin
The self-powered piezoelectric sensor can effectively address the power supply issue for electronic skin. However, it remains challenging to fabricate flexible sensors with a modulus similar to that of human skin. This paper reports a PVDF-based organohydrogels as a piezoelectric senor for electronic skin. PVA serves a primary network, promoting the formation of the electroactive β phase in PVDF and ensuring the piezoelectric performance of the organohydrogel sensor. PA enhances crosslinking density and mechanical properties by forming hydrogen bonds with PVA, while also acting as a gelling agent to reduce PVA crystallization. Additionally, organic solvent DMSO is introduced to impart antifreeze properties to the sensor. The organohydrogel exhibits excellent anti-fatigue performance after 100 compression loading–unloading cycles. Additionally, the organohydrogel piezoelectric sensor demonstrates an impressive response time of approximately 8 ms and a wide pressure range of 0–30 N. Furthermore, the piezoelectric organohydrogel exhibits excellent anti-freezing properties, retaining its mechanical and piezoelectric characteristics even after being frozen at low temperature for 10 days. The PVDF-based organohydrogel has been proven to have significant potential for human motion detection without the need for an external power source.
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Materials Today Communications
·
2025
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IF 4.5
Jihao Cai,Shengmei Huang,Wang Zhou,Ximai He,Hongbo Liang,Jianping Zhou,Chunhui Zhao,Ting Xu
In response to the development of electronic skin that mimics the functions of human skin, enormous efforts have been made to develop and synthesize new soft materials and to rationalize production techniques. Nevertheless, the development of electronically conductive materials that are elastic, stretchable and self-healing remains a major challenge. In this article, a series of self-healing, highly stretchable, solution-processable conductive polyaniline hydrogels with sequential hydrogen bonds are prepared by photopolymerization of acrylamide from a hydroxyl group located in the side chain of PVA, based on polyvinyl alcohol (PVA), acrylamide (AM), 2-acrylamide-2-methyl propane sulfonic acid (AMPS) and a polyaniline dispersion doped with phytic acid (PA). The conductive polyaniline hydrogel with an optimal composition can exhibit excellent self-healing capabilities and exceptional stretchability (up to 700 %). In the event of a tear, the mechanical properties can be restored with an efficiency of ≈ 90 % for 5 days without external stimulation, which is due to multiple hydrogen bonds and electrostatic interactions. In addition, this hydrogel, which has a gage factor (GF) of 2.73 and excellent levels of sensitivity, stability and repeatability, can be assembled into flexible sensors to capture dynamic human movements, such as joint flexion and vocalization. The conductive polyaniline hydrogel is produced through a process of photopolymerization and solution casting, which enables the production of electronic skin over large areas and at low cost.
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Yujing Sheng,Zenghao Li,Duanmin Gao,Panhong Niu,Xingfa Gao,Yuzhen Huang,Chuan Li,Jianfeng Qiu,Ruliang Zhang,Yinglun Sun
Intrinsically stretchable conductive materials based on elastic substrates and conductive components play important roles in biomedical applications, such as exercise rehabilitation monitoring and disease prediction. A persistent challenge is to combine high fatigue resistance with excellent mechanical properties in stretchable conductive materials. Herein, we present a stretchable conductive material with both good fatigue resistance and high tensile properties (∼3170%) based on poly(acrylic acid)-phytic acid-trehalose-polypyrrole (denoted as PPTP). The as-prepared PPTP hydrogel electrode showed no obvious cracking or delamination after 400 loading and unloading cycles and maintained good electrical signal transmission function after 1000 cycles. We further collected stable signals for human motion and handwriting using the stretchable hydrogel electrode as a strain sensor, demonstrating the potential application of the PPTP stretchable hydrogel electrode in biomedicine.
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POLYMER DEGRADATION AND STABILITY
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2024
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IF 6.3
Tinghao Wu,Yingqi Gu,Dong Zhao,Guodong Jiang,Tingwei Wang,Yucai Shen
Paper-based materials have become increasingly prevalent in the packaging and daily life. However, paper is flammable and hydrophilic, hindering its widespread application. Here, a novel reactive flame retardant of m-xylylenediamine phytate ammonium (MPAP) was prepared. Cellulose paper with superior flame-retardant and hydrophobic properties was successfully prepared by surface spraying technology and impregnation process, through the reaction of flame retardant and poly(methylhydrosiloxane) (PMHS) with cellulose fibers. The water contact angle (WCA) of the modified paper was 122.6°, while the limit oxygen index (LOI) value reached 41 %, which had significant self-extinguishing performance. The total heat release rate of the modified paper was reduced from 12.8 kJ/g to 0.6 kJ/g. The modified paper also exhibited excellent performance for oil/water separation. Furthermore, this effective and simple strategy can also be applied to other cellulose-contained substrates for the application in construction, textiles, furniture and other fields.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Xinyue Zhao,Dingyang Chen,Minsi Shi,Rui Zhao
Capacitive deionization (CDI) technology holds great potential for rapid and efficient uranyl ion removal from wastewater. However, the related electrode materials still have much room for research. Herein, chitosan/phytic acid complexes were anchored on polypyrrole nanotubes (CS/PA-PPy) to fabricate the electrode for the electrosorption of uranyl ions (UO 2 2+ ). In this system, polypyrrole nanotubes provided specific channels for ion and electron diffusion, and chitosan/phytic acid complexes offered selective sites for UO 2 2+ binding. The results demonstrated that CS/PA-PPy via electrosorption showed faster kinetics and higher uranium uptake than those via physicochemical adsorption. The maximum adsorption capacity toward UO 2 2+ via electrosorption (1.2 V) could reach 799.3 mg g −1 , which was higher than most of the reported CDI electrodes. Electrochemical measurements and experimental characterizations showed that the electrosorption of UO 2 2+ by CS/PA-PPy was a synergistic effect of capacitive process and physicochemical adsorption, in which the capacitive mechanism involved the formation of an electric double layer from hollow polypyrrole nanotubes, whereas the coordination of phosphate, amino and hydroxyl groups with UO 2 2+ was attributed to physicochemical adsorption. With the rational design of material, along with its excellent uranium removal performance, this work exhibited a novel and potential composite electrode for uranium capture via CDI from wastewater.
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EUROPEAN POLYMER JOURNAL
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2024
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IF 5.8
Zheng Wan,Rongfeng Qu,Yibo Sun,Yiyan Gao,Guanghui Gao,Kexin Chen,Tianyi Liu
Portable, miniaturized, intelligent and flexible electronic devices are more and more widely used in life areas. Conductive hydrogels with remarkable ion transport capabilities and tunable mechanical properties could be emerging materials for sensing devices. However, most of conductive hydrogels do not have antimicrobial activity, leading to microbial infections for human. Herein, a hydrogel with noteworthy biocompatibility, antimicrobial stability, anti-freezing, and anti-fatigue properties was designed and developed by introducing polyvinyl alcohol, phytic acid, and glycerol. Phytic acid and PVA formed hydrogen bonds by physically cross-linking, improving the fatigue resistance and toughness of the hydrogel. The hydrogel exhibited bacteriostatic zone against for Escherichia coli as well as Bacillus subtilis, and displayed antibacterial stability within 7 days. Hydrogels appeared distinguished biocompatibility due to the absence of allergic reactions in mouse subcutaneous tissue within 14 days. Hydrogels as sensors could monitor deformational movements such as speech and joint bending. Thus, hydrogels have the potential to be used as antimicrobial materials in medical applications such as implantable sensors and clinical information interventions.
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Materials Today Communications
·
2024
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IF 3.7
Yun Lei,Qiangqiang Zheng,Haoran Zhu,Rui Dou,Jiabin Yuan,Yonggang Zhao,Haoping Peng,Pengfei Yu
We synthesized PA-SiO 2 gel nanoparticles using sol-gel method by modifying silica aerogel with phytic acid (PA) and 2-(3-epoxycyclohexane) ethyl trimethoxysilane (Si186). By introducing the PA-SiO 2 gel nanoparticles into waterborne epoxy (WEP) coating, the PA-SiO 2 gel1.0 %/WEP coating exhibits excellent corrosion resistance. This is mainly attributed to the strong complexation of PA with metal ions and the physical barrier effect of SiO 2 gel as a filler. In this case, the PA-SiO 2 gel nano-filler not only fills the defects and pores in the WEP coating, but also acts as a physical barrier to extend the invasion of corrosive substances. In addition, the strong complexation of PA with metal ions forms a protective film of a dense complex on the metal surface to prevent further corrosion. Meanwhile, the interface interaction between the coating and metal is enhanced, and its mechanical properties are improved. The electrochemical impedance spectroscopy (EIS) results show that the impedance modulus of PA-SiO 2 gel1.0 %/WEP coating (1.53×10 9 Ω·cm 2 ) is three orders of magnitude higher than that of pure WEP coating (9.33×10 6 Ω·cm 2 ) at 0.01 Hz after immersion in 3.5 wt% NaCl solution for 30 days. The Tales test results show that the corrosion inhibition efficiency is 99.9 % higher than that of pure WEP coating.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yu-Xuan Xu,Jian-Chen Han,Qiang Tang,Lin Gu,Qing-Yun Wu
Solar-driven desalination has received tremendous attention due to its utilization of renewable solar energy, minimized carbon footprint, and simple installation. However, the traditional solar evaporator has the disadvantages of damaged light absorption and low heat transfer efficiency. In this work, a leaf-like photothermal evaporator (LPE) is designed by integrating the functions of light-to-heat conversion, water transport and evaporation, and vapor discharge. The photothermal layer is made of graphene oxide reduced by tannic acid, which shows a full–spectrum optical absorption as high as 94 % and achieves a strong combination with the water transport-evaporation layer thereby improving the heat conduction. Due to the chemical and mechanical bonding between tannic acid and cellulose, the temperature difference between the photothermal layer and the water transport-evaporation layer was reduced by 33 %. In addition, the water transport-evaporation layer adopts a Janus structure, which makes the water transport-evaporation layer thinner, thereby reducing the heat loss during the water transporting process, and provides a hydrophobic surface with good resistance of salt precipitation. By combing with an aluminum-made invert-structured condenser, a reversed solar-driven desalination (RSDD) system is proposed, whose water collecting rate is greatly improved to be 1.007 kg m −2 h −1 . A freshwater collection efficiency as high as 80 % is almost the highest value of a single-stage solar distiller. Besides, a single-stage solar distiller with four LPEs in parallel is made and applied in the outdoor desalination. This work proposes a design idea for a new type of solar distillation system, which will play a role in response to the water crisis.
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COMPOSITES PART B-ENGINEERING
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2024
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IF 12.7
Ying Han,Mouyuan Sun,Xingchen Lu,Kailei Xu,Mengfei Yu,Huayong Yang,Jun Yin
In neural tissue engineering , biomaterial scaffolds that have high conductivity and customized structures are crucial in promoting nerve regeneration. Poly(3,4-ethylenedioxythiophene) (PEDOT) has emerged as a promising conductive polymer with excellent chemical stability and biocompatibility. However, traditional three-dimensional (3D) printing of PEDOT-based conductive scaffolds faces challenges in limited printing resolution, poor solubility, and brittleness of conductive materials . Herein, digital light processing (DLP) printing was used to fabricate complex hydrogel structures using gelatin methacryloyl (GelMA) and chitosan (CS) while incorporating PEDOT nanoparticles through interfacial polymerization to create conducting pathways within a hydrogel structure. The integration of PEDOT significantly enhanced the electrical conductivity and mechanical properties of the GelMA/CS hydrogel while preserving printed details. The GelMA/CS-PEDOT hydrogel promoted cell proliferation and facilitated axon outgrowth of PC12 cells and Schwann cells during in vitro culture. Moreover, in vitro direct current electrical stimulation promoted axon elongation of PC12 cells cultured on a conductive substrate. In vivo studies used a conductive nerve conduit to repair a 10-mm rat sciatic nerve defect, validating the efficacy of GelMA/CS-PEDOT scaffold in peripheral nerve injury repair. These findings highlight the significant potential of conductive GelMA/CS-PEDOT hydrogel in the field of neural tissue engineering.
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