ACS Applied Polymer Materials
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2023
·
IF 5
Jia Xu,Zhaomin Chen,Jiwei Jiang,Bo Song,Hui Zhang,Bin Dong
Freshwater crisis is a global problem and seeking more sources of fresh water is the key to solving this problem. Solar water purification and fog collection are two separate ways to obtain fresh water. However, neither of these methods could operate 24/7 when used alone. Herein, we report a hydrogel membrane that can achieve both solar water purification and fog collection, thus enabling all-day freshwater collection. The hydrogel membrane with microstructured patterns inspired by the structure on the back of the Namib Desert beetle consists of poly(vinyl alcohol) (PVA), chlorine-reinforced polypyrrole (PPy-Cl), and silicon dioxide nanoparticles (SiO2NPs), which is capable of harvesting up to 25 L of fresh water per square meter per day under the outdoor conditions. The excellent freshwater collection capacity is realized based on the synergetic interaction among the hydrophilicity of PVA, the photothermal conversion capacity of PPy-Cl, and the biomimetic microstructures. Furthermore, due to the improved mechanical properties brought by SiO2NPs, the hydrogel-based evaporator reported in the current study has better water resistance as well as mechanical properties, which allows it to be used outdoors for long periods of time and facilitates its practical application.
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ACS Biomaterials Science & Engineering
·
2023
·
IF 5.8
Guangzhao Tian,Dan Yang,Chunrong Chen,Xiaoge Duan,Dong-Hwan Kim,Hailan Chen
The implantation of neural electrodes usually induces acute and chronic inflammation, which can result in the formation of glial scars encapsulating the implanted electrodes and the loss of neurons near the active electrode sites. Local presentation of anti-inflammatory drugs or neural protective factors has been evidenced as an effective strategy to modulate inflammatory responses and promote electrode–neuron integration. Here, a novel delivery system for the simultaneous presentation of both anti-inflammatory drugs (dexamethasone, Dex) and nerve-growth-promoting factors (nerve growth factor, NGF) from the electrode sites was developed via layer-structured carbon nanotubes and conductive polymers. The modified electrodes exhibited higher charge storage capacitance and lower electrochemical impedance compared to unmodified electrodes and electrodes coated with polypyrrole/Dex. Dex released from the functional coating under controlled electrochemical stimulation was able to inhibit the lipopolysaccharide-induced secretion or mRNA transcription of inflammatory cytokines, including nitric oxide, TNF-α, and IL-6 in RAW264.7 cells, and control the activation of cultured astrocytes. In addition, the functional coatings did not show a toxic effect on PC12 cells and primary neural cells but exhibited promoted activities on the adhesion, growth, and neurite extension of neural cells.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Jingpi Gao,En Li,Kena Song,Tongtong Ma,Ran Yang,Yi Zhang,Nan Li,Xiaoran Liu,Jinghua Li
The dye degradation method based on Fenton-like heterogeneous nanostructures has gained significant attention in recent years. We have developed a Copper-Stannum-Polypyrolle-Heterogeneous (Cu–Sn oxide-PPy Heterogeneous, CSPHGs) catalytic system. The system uses a PN junction formed by two oxide semiconductors (Cu 2 O and SnO 2 ) as the core, which is then coated with polypyrolle (PPy) on the outer layer. Under near-infrared (NIR) light irradiation (500.0 μg ml −1 , 1.2w·cm −2 ), the temperature rapidly reached approximately 45 °C within 5 min, demonstrating excellent photothermal performance. We have overcome the limitation of traditional Fenton reactions that require weak acidic conditions for effective operation. Moreover, we have increased the photostability of Cu 2 O monomers by incorporating them into a three-layer heterostructure . The Rhodamine B (RhB) degradation experiment revealed that the generated reactive oxygen species (·OH), effectively catalyze the decomposition of dyes. Within 120 min, the degradation rate exceeded 99%. This research provides a new option for environmental remediation through the combination of photo-Fenton and photothermal processes.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Zhenglong Xu,Yifan Yang,Chuming Ye,Xianglong Lin,Jianfeng Shen,Mingxin Ye
Interfacial solar-powered water evaporation is a cost-effective and sustainable approach using solar energy for seawater desalination. Nevertheless, salt accumulation during solar desalination generally restricts the widespread application of solar vapor generation. Herein, taking merits of the excellent hydrophilicity and inherent porosity of holocellulose (HC), An excellent salt-resistant solar steam evaporator for long-term interfacial solar water desalination was fabricated by decorating polypyrrole (PPy) on the surface of HC. Due to the broadband light absorbance of PPy and the superhydrophilic HC substrate, the PPy-HC evaporator exhibited a high evaporation rate of 1.45 kg m −2 h −1 and conversion efficiency of 93.4 % in a 5 wt% NaCl solution under one sun illumination. Importantly, the evaporator presented superior salt-resistance and stability during long-term cycling test in high salinity brine. This work reveals the key role of superhydrophilicity and water transportation capability in high salt solution solar-driven desalination. Thus, this work provides an effective approach to address the issue of salt accumulation of the traditional evaporator, demonstrating its great potential for real-world solar-driven seawater desalination.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Xinliang Mei,Xingyu Wang,Wenshuai Huang,Jiaxing Zhu,Kecheng Liu,Xingsheng Wang,Wei Cai,Ruiyin He
The monitoring and the rapid quantification of pesticides and their residues are becoming increasingly important in the field of food safety. Herein, the polycaprolactone/polypyrrole/β-cyclodextrin (PCL/PPy/β-CD) flexible sensor was developed for the electrochemical determination of new neonicotinoid insecticide Dinotefuran (DNF). The morphology, structure, and hydrophilicity of PCL/PPy/β-CD sensor probes were characterized by SEM, FTIR spectroscopy and static contact angle test. Under optimum conditions, the fabricated PCL/PPy/β-CD sensor exhibited excellent electrochemical sensing performance for DNF with a low detection limit of 0.05 μM in the linear concentration range from 0.2 μM to 50 μM and high sensitivity 14.07 μA·μM −1 ·cm −2 , which attributed to the two-stage porous structure, good electron transfer rate and the adsorption effect. The PCL/PPy/β-CD sensor also showed reproducibility (RSD = 4.76%), stability, and high selectivity towards DNF. In addition, a real samples investigation in rice with recoveries of 96.67 % ∼ 103.65 % implied the good application potential of PCL/PPy/β-CD in DNF monitoring.
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Zhengdong Ma,Yehua Shen,Xiaoheng He,Hua Fan,Wenbo Wang,Qiuhong Bai
Renewable biomass-derived carbon materials are beneficial for the sustainable development of energy. Herein, we propose a strategy to fabricate nitrogen-doped tubular porous carbon (PPy@JEC) by depositing Polypyrrole (PPy) on the surface of Juncus effusus (JE) microtubes and then carbonizing and activating with KOH. Changing the activation temperature and dosage of the activator could effectively regulate the pore structure of PPy@JEC. Such tubular porous carbon retains JE's natural microtubule structure for improving electrolyte ions transfer efficiency. The optimal carbon materials exhibited a high specific surface area (1955 m 2 g −1 ), good electrochemical performance (326 F g −1 at 0.5 A g −1 ), and the capacitance retention reached 66 % at 20 A g −1 . The symmetric supercapacitor constructed using the optimal PPy@JEC exhibits an energy density of 15 Wh kg −1 . The capacitance retention rate can remain 90.9 % after 15,000 cycles at 5 A g −1 . This work demonstrates that PPy@JEC can be a potential candidate for low-cost and sustainable supercapacitor electrode materials.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Gaosheng Li,Yujiao Gao,Chenyu Sun,Fukun Niu,Zhuqun Shi,Quanling Yang,Chuanxi Xiong
Flexible sensors based on biological hydrogels have gained significant attention in the fields of wearable devices , human-computer interaction robots, and medical monitoring. Nanocellulose , a natural polymer material, offers advantages such as low cost, abundant reserves, green environmental protection, and renewability. However, the high water content of the nanocellulose-based flexible sensor limits its application at low temperatures, making it difficult for the nanocellulose-based hydrogel electronic skin to function properly. To enhance the hydrogel's anti-freezing and anti-drying properties, we introduced glycerol (GL) into the in-situ grown polypyrrole (PPy) hydrogel of 2,2,6,6-Tetramethylpiperidine-1-oxyl radical (TEMPO) oxidized cellulose nanofibril (TOCN) and obtained the organic hydrogel TOCN/PPy/GL. The prepared TOCN/PPy/GL organic hydrogel maintains excellent electrical conductivity , mechanical properties , and strain sensing capabilities (strain sensitivity GF=2.41 at −45 ℃, response time 100 ms, recovery time 200 ms). The TOCN/PPy/GL organic hydrogel electronic skin also exhibited exceptional anti-drying property, with a volume retention of 66.75% after 24 h at 100 ℃, which is six times higher than the volume retention of TOCN/PPy hydrogel without GL under the same conditions.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2023
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IF 3
Qinglong Cao,Zhen Shu,Taoyi Zhang,Wenxi Ji,Jing Chen,Yun Wei
In recent years, the smart hydrogels have gained much concern in the field of research specially related to flexible strain sensors because they exhibit many types of smart interactions that can be useful in wearable devices. However, the conventional hydrogels have poor electrical conductivity that affect the performance of the sensors, so it remains a challenge to achieve noncontact signal monitoring (e.g., for the detection of magnetic field changes). In this study, an ultra-stretchable and magnetically responsive conductive hydrogel was fabricated by adding magnetic ferric tetroxide@polypyrrole composite nanoparticles (Fe 3 O 4 @PPy NPs) to polyacrylamide (PAm). The nanoparticles were easily agglomerated and improved the compatibility of PPy and hydrogel. The obtained PAm/Fe 3 O 4 @PPy hydrogel showed an ultra-stretchability of (961%), a low elastic modulus of (87.8 kPa), and an excellent toughness of (1010.5 kJ m −3 ). Moreover, PAm/Fe 3 O 4 @PPy hydrogel also exhibited a high electrical conductivity of 0.34 S m −1 , and the PAm/Fe 3 O 4 @PPy hydrogel sensor could detect human motions (such as bending of finger, bending of wrist) and muscle micromotion (such as pronouncing). In addition, it can also monitor the change in magnitude of magnetic field.
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BIOMACROMOLECULES
·
2023
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IF 6.2
Xuan Cao,Qinglong Cao,Taoyi Zhang,Wenxi Ji,Usman Muhammad,Jing Chen,Yun Wei
Hydrogel-based flexible strain sensors have been known for their excellent ability to convert different motions of humans into electrical signals, thus enabling real-time monitoring of various human health parameters. In this work, a composite hydrogel with hydrophobic association and hybrid cross-linking was fabricated by using polyacrylamide (PAm), surfactant sodium dodecyl sulfate (SDS), lauryl methacrylate (LMA), and polypyrrole (PPy). The dynamic dissociation-conjugation among LMA, SDS, and PPy could dissipate energy to improve the toughness of hydrogels. The SDS/PPy/LMPAm composite hydrogel with a toughness of 1.44 MJ/m3, tensile fracture stress of 345 kPa, tensile strain of 1021%, and electrical conductivity of 0.57 S/m was obtained. Furthermore, an interdigital electrode flexible pressure sensor was designed to replace the bipolar electrode flexible pressure sensor, which greatly improved the sensitivity and resolution of the pressure sensor. The SDS/PPy/LMPAm composite hydrogel-based interdigital electrode flexible pressure sensor showed extraordinary stability and identified different hand gestures as well as monitored the pulse signal of humans. Moreover, the characteristic systolic and diastolic peaks were clearly observed. The pulse frequency (65 times/min) and the radial artery augmentation index (0.57) were calculated, which are very important in evaluating the arterial vessel wall and function of human arteries.
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Small
·
2023
·Vol. 19
·期 49
·2304060
·
IF 13.3
Haoran Da,Wenhao Fang,Jiufu Zhu,Jin Li,Shanshan Pan,Jiajia Li,Jiaqi Huang,Haitao Zhang,Suojiang Zhang
As spent batteries can be considered as alternative raw sources of electrode materials; the development of regeneration techniques for spent graphite becomes key to realizing economic and environmental sustainability. Herein, the reutilization of small spent graphite particles is domonstrated due to their special structural characteristics, which may directly contribute to the improvement of lithiation kinetics and high-rate charging during long-term cycling. Such intrinsic defects and external cracked channels may be introduced by the aging of intrinsic bulk structure and exfoliation of surface structure. On account of these potential advantages, a carbonized polypyrrole layer on sieved small graphite particles is developed to obtain superior rate performance. The coated amorphous/graphitic layer could repair the exposed edge and basal plane, and significantly facilitate Li ion diffusion during fast charging. Moreover, the enhanced performance may favor the improved homogeneity of current density distribution during fast charging, which is confirmed by a porous electrode model. The regenerated graphite with a disorder/order coating layer could effectively regulate the Li + transport channel, exhibiting a high specific capacity at high-rate charging (102.7 mAh g −1 at 4 C after 500 cycles) without severe Li plating. This work provides an opportunity to utilize spent graphite in fast-charging batteries.
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JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
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2023
·
IF 3.6
Ting-Ting Li,Shiqi Wang,Jiaxin Li,Ying Zhang,Xing Liu,Liyan Liu,Hao-kai Peng,Hai-tao Ren,Lei Ling,Jia-Horng Lin,Ching-Wen Lou
When impaired bones are grafted with bone scaffolds, the behaviors of osteoblast are dependent on the implant materials and surface morphology. To this end, we modulated the surface morphology of scaffolds that promote cell growth. In this study, ice-template and spraying method methods are employed to coat different proportions of PDA and PPy over the PLA/PVA weaving scaffolds, after which HA is Coated over via the electrochemical deposition, forming weaving scaffolds with electrically conductive PDA/PPy/HA coating. The test results indicate that with a PPy/PDA concentration ratio is 30, the PPy particles are more uniformly distributed on the fiber surface. The scaffolds are wrapped in a HA coating layer with a high purity, and calcium and phosphorus elements are evenly dispersed with a Ca/P ratio being 1.69. Owing to the synergistic effect between PDA and PPy coating, the scaffolds demonstrate excellent electrochemical stability and electrochemical activity. The biological activity of the scaffold increased to 274.66% under electrical stimulation. The new thinking proposed by this study extends the worth of applying textile structure to the medical field, the application of which highly increases the prospect of bone tissue engineering.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.2
Hui Wang,Dengjie Zhong,Yunlan Xu,Haixing Chang,Hongyu Shen,Chunzi Xu,Jiaxin Mou,Nianbing Zhong,Bin Tang
In this work, in view of the poor adsorption capacity of sludge-based biochar, a sludge-based biochar adsorbent co-modified with hydrochloric acid and polypyrrole (PPy/SBC-HCl) was prepared and used to remove Cr(VI) from aqueous solution. Its characterization of SEM, EDS, BET, XRD, FT-IR, and XPS show that the removal mechanism of Cr(VI) by PPy/SBC-HCl includes electrostatic adsorption, ion exchange, reduction, and complexation. The removal efficiency of Cr(VI) by PPy/SBC-HCl decreases with the increase of pH. The coexisting cations Ca2+ and Mg2+ have a slight negative effect on it, while the oxoacid anions have a great negative effect on it. The adsorption of Cr(VI) by PPy/SBC-HCl is a spontaneous endothermic process, which conforms to the pseudo-second-order adsorption kinetic model and the Freundlich adsorption isotherm model. The maximum adsorption capacity is 97.37 mg g−1 at pH 2.0 and temperature 298 K.
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