CRYSTENGCOMM
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2024
·
IF 2.6
Shanxiang Sheng,Meng Wu,Chao Zhi,Yongzhen Wang,Jiaguang Meng,Yaming Liu
High saturation and high stability are two issues that must be addressed in the practical application of structural color based on self-assembly of colloidal microspheres. Herein, we coated SiO2 microspheres with island-like polypyrrole (PPy), a black substance that can absorb incoherent light scattering, thereby enhancing the saturation of structural colors on both black and white substrates. Besides, the irregular island-like structure prompts the SiO2@PPy microspheres to form a short-range ordered amorphous structure, exhibiting non-iridescent structural colors. Importantly, we propose a melt-curing strategy that can enhance the interaction forces between the two microspheres and between the microspheres and the substrate, thus enabling the structural colors to exhibit good stability. Even after rubbing, folding, and ultrasonic cleaning tests, the color of the cured sample remains virtually unchanged. The SiO2@PPy microspheres prepared and the melt curing strategy in this work can lay foundations for the practical application of structural colors.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Min Yin,Chaohu Xiao,Yang Jin,Yanyu He,Yuhan Zhang,Lihua Chen
Solar-driven interfacial evaporation plays an essential part in the production of potable water. Nevertheless, the intricate water conditions in real-world scenarios continue to pose limitations on its utilization. This study prepared a novel bionic PPy/BiVO 4 -PI/MXene aerogel composite material with radial center structure through directional freezing as the evaporator, which integrates both photothermal and photocatalytic properties into the evaporation system. In order to evaluate the efficacy of photocatalytic degradation and salt collection during interfacial evaporation, high-concentration saline water, simulated seawater and dyeing wastewater were employed as substitutes for real contaminated water bodies. After being exposed to 1 kW/m −2 (−|-) of irradiation, the PPy/BiVO 4 -PI/MXene composite exhibits an evaporation rate of 1.64 kg m -2 h −1 and achieves a photothermal efficiency of 96.77 %. In high-concentration saltwater containing 20 wt% NaCl, the PPy/BiVO 4 -PI/MXene exhibited an evaporation rate of 1.32 kg m -2 h −1 and a photothermal conversion efficiency of 77.41 %. Furthermore, approximately 26.7 g of salt can be collected after 15 days’ continuous evaporation. Furthermore, the PPy/BiVO 4 -PI/MXene demonstrated exceptional photocatalytic capabilities to organic dyes such as MB, RhB, CR and MG with removal efficiencies of 79.28 %, 70.96 %, 76.70 % and 80.95 %, respectively. This study realizes the synergistic effect of interfacial evaporation, photocatalysis and salt collection, providing a highly promising choice for the treatment of high-salt dyeing wastewaters.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kai Zhang,Rui Zhang,Qiguan Wang,Youjun Huang,Qiannan Liang,Guixin Wang,Yuxiao Hu,Ke Qin,Sumin Wang
Loading metal oxides on carbon nanotubes (CNTs) is a commonly used method to enhance the pseudocapacitance (PC) of metal oxides via the improved electrical conductivity. However, the small nanometer-sized tube of CNTs is factually an inaccessible internal channel for the diffusion of large hydrated ions, which reduces the contribution of electric double layer capacitance (EDLC) of CNTs and limits the rate capability of composites. To address this challenge, a 50-nm-diameter channel is here constructed in NiO@nitrogen-containing carbon (NC) by high-temperature calcination of Ni(OH) 2 /polypyrrole nanotube composite. The large-sized NC channel produced from decomposed polypyrrole significantly boosts the internal accessibility and accelerates the flow and penetration of electrolyte into the NC tube, enhancing the EDLC contribution of NCs and improving rate performance. The obtained worm-like NiO@NC shows high ion diffusion coefficient and impressive specific capacitance (SC). The assembled NiO@NC||graphene aerogel asymmetric supercapacitor offers high EDLC contribution of 65 % and exhibits a high SC of 763F g −1 , with outstanding retention of 93.40 % after 50,000 cycles at large current density. This study demonstrates an innovative approach to effectively combat the issue of internal inaccessibility of tubular carbon materials, marking an enormous progression in supercapacitor technology.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2024
·
IF 2.4
Bi Cen,Wen Qing,Chen Ye,Xu Haitao
Microbial fuel cell (MFC) has been regarded as a promising green and clean electricity generation device. The anode plays a crucial role in the electricity generation process within the MFC. This study employed a hydrothermal method for the doping of sulfur onto MXene nanosheets to alleviate the stacking, followed by an in situ polymerization process to fabricate sufur-doped MXene/polypyrrole (S–MXene/PPy) composite hydrogel on carbon felt (CF). The MFC constructed with this anode exhibited the highest power density of 8.05 W m −3 and a maximum output voltage of 646 mV, higher than that of MXene/PPy (623 mV, 6.03 W m −3 ), PPy (594 mV, 4.91 W m −3 ), and unmodified CF (574 mV, 4.05 W m −3 ). This improved performance can be attributed to the reduction of charge transfer resistance in the material while improving the bacteria affinity, leading to enhanced extracellular electron transfer (EET) efficiency. High-throughput sequencing indicates that the excellent biocompatibility significantly promotes the attachment and growth of electroactive microorganisms ( Geobacter , 45.34%) on the S–MXene/PPy anode. This study demonstrates that S–MXene/PPy hydrogel has good potential as an anode from the perspective of MFC electricity generation and microbial analysis. Graphical abstract
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SENSORS AND ACTUATORS A-PHYSICAL
·
2024
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IF 4.1
Yuhan Zhao,Rui Zhang,Yunqing Liu,Feng Wang,Shi Hu,Fenghui Yang,Chao Tao,Qiong Wu,Baoli Zha,Jiansheng Wu,Fengwei Huo
The commonly employed wet and semi-dry electroencephalogram (EEG) electrodes require the use of conductive media, resulting in issues such as reduced comfort, detached conductive coatings, and limitations in long-term wearing. In this study, we present a user-friendly dry EEG electrode made from conductive leather for long-term EEG monitoring. The conductive leather was obtained by in-situ synthesis of polypyrrole inside the goat leather, which could be further used as an EEG electrode. When positioned on the forehead, the interface impedance between the leather electrode and human skin complied with the international standard for EEG electrodes. The material's exceptional breathability enabled prolonged electrode wear. These leather electrodes facilitated precise monitoring of eye movement signals and α-wave activities in a relaxed state, laying the groundwork for extending their application to other brain regions. Furthermore, leather electrodes exhibited excellent performance even in the presence of sweat interference, thus confirming their advantages for long-term EEG monitoring. The leather dry electrode featuring superior wearability, portability, and long-term stability is expected to bring significant implications for future wearable technologies and monitoring devices.
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Journal of Food Measurement and Characterization
·
2024
·
IF 2.9
Wang Xin,Hu Xuetao,Zhai Xiaodong,Huang Xiaowei,Li Zhihua,Zou Xiaobo,Shi Jiyong
The effective detection of trace lead ions in food is a challenging task due to its stability, difficulty in elimination, and high toxicity to the human health. Therefore, an electrochemical sensing based on an amine-functionalized Zr (IV) metal–organic framework (UiO-66-NH 2 ) and polypyrrole (PPy) composite nanomaterials were established for detected lead ions in meat. The UiO-66-NH 2 @PPy composite nanomaterials were prepared by in-situ polymerization of reaction pyrrole on the surface of UiO-66-NH 2 . The porous structure, high specific surface area of UiO-66-NH 2 and amino groups as metal ion binding sites are conducive to the adsorption and preconcentration of lead ions. The addition of PPy can enhance the conductivity of the composite and the active area of the electrode. Under optimal experiment conditions, the electrochemical sensing can be successfully used for the detection of trace lead ions, and the detection limit is as low as 0.05 μg/L. In addition, the sensing was applied to analyze lead ions in 30 pork samples, and the results showed that the lead contents in pork kidney samples were significantly higher than that in pork liver and pork tenderloin.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yuhao Chen,Haixiang Sun,Peijian Wang,Qian Yu,Yuhui Niu,Sihui Tang,Tengfang Zhang,Bangzhen Liu,Q. Jason Niu
Highly permeable thin film composite (TFC) reverse osmosis (RO) membranes with abundant free volume are desirable for water treatment. However, the strategy of controlling the microstructure of the separation layer with high free volume rate is still a challenge. In this work, a modified strategy for the preparation of high-performance TFC RO membrane with inverse diffusible polypyrrole nanoparticles (PPYN) as organic phase additive was developed. The combination of PPYN and trimesoyl chloride (TMC) would diffuse backwards from the organic phase into the aqueous phase during the reaction process to disrupt the normal interfacial polymerization (IP) and thus introduce more free volume in the RO membrane due to the nanobubbles from violent reactions. Moreover, the thickness of the modified membrane decreased and the hydrophilicity increased based on the modulation of IP by PPYN, which facilitated the water molecules to transport. The prepared RO-PPYN membranes showed nearly three times the flux compared with the pristine RO membrane without sacrificing separation selectivity. Furthermore, the anti-biofouling property of the modified membrane was also improved. This work successfully demonstrated the potential use of PPYN as an organic filler to enhance the performance of seawater desalination in RO membranes. Our modification strategy provides an efficient and convenient way to prepare novel RO membranes with high permeability.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Wenqi Wang,Xiping Gao,Jing Chen,Chang Lu,Qiancheng Zhang,Yanzi Li,Ruitao Zhang,Dahu Yao,Xinchang Pang
Solar interfacial evaporation technology has been widely used in the field of water purification due to its low carbon emission and environmental friendliness. However, improving evaporation rates through the structural design of interfacial evaporators remains a challenge. Here, we prepared biodegradable aerogels based on cellulose nanofibers, chitosan, and citric acid, and subsequently prepared a solar evaporator with low enthalpy of evaporation by loading polypyrrole photothermal conversion agent on the aerogel. The evaporator is rich in hydrophilic groups such as hydroxyl, amine, and carboxyl groups, and the hydrogen bonding between them and water molecules changes the state of water adsorbed in the aerogel and reduces the evaporation enthalpy of the adsorbed water. The DSC results show that the evaporation enthalpy of water in the evaporator is as low as 1103 J g −1 . As a result, the solar evaporator has a high evaporation rate of 3.29 kg m −2 h −1 for pure water and 3.57 kg m −2 h −1 for 3.5 wt% brine with a solar efficiency of only 86.2 % (1.0 sunlight intensity). Moreover, the evaporator also has a better purification ability for dye wastewater. This research presents a simple and effective strategy for manufacturing high-performance degradable evaporators from biomass materials.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Jianjun Wang,Dongning Li,Xueqing Liu,Jiao Liu,Zhichun Shi,Yu Zang,Toshiki Aoki
Nuclear energy, as an efficient and clean energy source, has been widely used in recent years, and the extraction of uranium from water resources is of great significance. Herein, a porphyrin-based hyper-cross-linked polymer with functional amidoxime groups (HCP-TPP-AO; TPP = tetraphenyl porphyrin, AO = amidoxime group) was successfully prepared and used for uranium adsorption. Owing to its abundant porous morphology and the strong chelation of amidoxime/TPP groups to uranium, HCP-TPP-AO removed 94.2% of uranium ions from aqueous solutions. The kinetic behavior of uranium adsorption on HCP-TPP-AO was comprehensively investigated and was consistent with the kinetic process dominated by chemical adsorption. HCP-TPP-AO also preferentially adsorbed U(VI) rather than other competing ions and exhibited a distribution coefficient (Kd) of up to 8.12 × 104 mL/g. Furthermore, the HCP-TPP-AO adsorbent could maintain 84.6% of its adsorption capacity after seven reuse cycles without any changes in its chemical structure or porous morphology. Electrostatic potential (ESP) analysis and adsorption calculations proved that amidoxime groups and TPP units in the polymer network of HCP-TPP-AO made a great contribution to the U(VI) adsorption capacity.
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ACS Applied Polymer Materials
·
2025
·
IF 4.7
Changmei Lin,Zhenhao Pei,Jun Chen,Jinxin Lan,Hai Huang,Xiaojuan Ma,Shilin Cao
Tactile sensors are an important area in developing electronic skins and human–machine interfacing. Herein, we reported an eco-friendly cellulose paper based tactile sensor driven by a triboelectric nanogenerator (TENG). Enabled by the surface modification of polymethylhydrosiloxane (PMHS) and polypyrrole (PPy), the triboelectric negative performance and conductivity of cellulose paper were improved; therefore, the modified cellulose paper could be applied to the triboelectric negative material and electrode for TENG. At the contact and separation mode (CS mode), the short-circuit current (ISC), open-circuit voltage (VOC), and power density of the corresponding device were improved to 0.52 μA, 11.6 V, and 736.9 μW/m2. In addition, a single-electrode TENG based on this modified cellulose paper was also obtained by pairing it with human skin. The results indicated that this single-electrode TENG could generate a voltage of 23.8 V, current of 1.1 μA, and surface charge of 4.3 nC. Meanwhile, a tactile sensor for written stroke recognition based on the single-electrode TENG was also demonstrated.
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Open Chemistry
·
2012
·Vol. 10
·期 4
·1157-1164
·
IF 0
Zhihong Zhang,Guijuan Li,Fufeng Yan,Xianjun Zheng,Xili Li
Plasma polymerized pyrrole-like (PPpy) films exhibit good environmental stability and offer high reactivity with biomolecules. The present paper follows on from previous work on PPpy films applied as DNA immobilization/hybridization and describes the adsorption kinetics of bovine serum albumin (BSA) on PPpy films. Atom force microscopy was used to detect the surface roughness of PPpy surfaces obtained at different input powers or for different polymerization time, including the surface roughness before and after BSA adsorption. The influence of experimental conditions (i.e., the plasma input power, the polymerization time, the concentration of BSA, and the pH values of buffer solutions) on protein adsorption was investigated in situ by Surface plasmon resonance spectroscopy (SPR). SPR analysis confirmed the differently dynamic adsorption behavior of BSA on PPpy films under various experimental conditions. The adsorption constant, K a , was deduced from Langmuir isotherm equations, which were simulated using experimental data collected by SPR and electrochemical impedance spectroscopy (EIS). Analysis of the combination data of SPR and EIS indicates that PPpy films under various conditions show completely different adsorption behaviors and could be applied as biomaterials for electrochemical protein sensing or as protein-resistant.
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Advanced Electronic Materials
·
2024
·
IF 5.3
Shanlei Guo,Jing Sun,Xue Wang,Yanhong Tong,Qingxin Tang,Yichun Liu
Organic thin-film transistors (OTFTs), the key component of the future wearable electronics, have the outstanding advantages including cost-effective, low-temperature, and large-area production. However, all-organic TFTs with an all-solution process and high-precision electrode pattern remain an enormous challenge due to dissolution and incompatible fabricated processes between functional layers. Here, a universal, solution-free transfer and lamination strategy is proposed, which is totally compatible with various commercial materials and fabricated technique in transistors. Excellent mechanical stability, good operation, high-precision electrode patterns, and outstanding conformability are observed in the all-organic TFTs. Moreover, as a proof-of-utility for the strategy, the all-organic complementary inverters are fabricated based on all dry-transfer processes with gain value of 11.2 and stable properties in 30 days in the air. This work provides a universal, solution-free transfer and lamination strategy to fabricate high-precision, all-solution-processed, all-organic devices fully maximizing the great advantages of organic materials for the future multilayered functional, commercialized, and industrialized flexible electronics.
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