Advanced Fiber Materials
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2024
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IF 17.2
Liu Jiaxin,Qi Shuo,Wang Hongshan,Fu Chiyu,Xu Weilin,Su Bin,Tang Wenyang,Xia Zhigang
Wearable electromagnetic interference (EMI) shielding devices are highly demanded to reduce the endlessly emerging EM pollution. Undesired durability and limited scale-up production capacity are the main obstacles to hinder the industrialized application of flexible EMI wearables. Here, a scalable Fe 3 O 4 /polypyrrole (PPy) embedded cotton/polypropylene (FP@CP) fabric is introduced for EMI shielding and Joule heating, which is achieved by a unique particle flow spinning method. This method can continually manufacture functional yarns in large quantities, followed by weaving into fabrics. The core-sheath yarn structure can highly embed Fe 3 O 4 /PPy shielding layer by polypropylene (PP) strips, which protects internal functional components from leakage or damage by the environment. Consequently, the obtained fabrics present greater durability (50 washing and 465 abrasion cycles) in comparison with most reported EMI devices. The EMI shielding mechanism was investigated through both experimental and simulation methods. It suggests that the combination of EMI reflection and absorption modes synergistically contributes to enhancing the EMI shielding property of obtained fabrics, reaching a maximum total shielding effectiveness (SE T ) of 47 dB. Besides, the composite fabric achieves a high Joule heating temperature to 105 ℃ at 3 V within 10 s due to its efficient electric-thermal property. This work paves a cost-effective way to realize scale-up manufacturing of versatile EM protection textiles to be applied in daily, military and aerospace fields. Graphical
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Qikang Huang,Peize Li,Mingkui Wang,Yan Shen
This study reports on determining kinetics of electrochemical reduction CO 2 to CO on Au catalysts using the substrate generation/tip collection (SG/TC) mode of scanning electrochemical microscopy (SECM). We introduced a simple but effective method based on transient technique to obtain a series of apparent heterogeneous rate constants k based on Fick’s second law by controlling the tip-substrate distance and the voltage of the substrate electrode within the SECM framework. By analysis the transient current recorded during the chronoamperometric characterization, we can successfully determine the apparent rate constant k for the simplified total conversion process of CO 2 + 2H + + 2e - → CO + H 2 O onto Au catalyst electrode serving as an example, which increases from 5.02 × 10 –2 cm⋅s −1 to 7.16 × 10 –2 cm⋅s −1 in the low potential range of −2.2 to −2.6 V (vs. Pt/PPy) and decreases to 6.54 × 10 -2 cm⋅s −1 at –2.8 V (vs. Pt/PPy). The method proposed here can be applied to quantitatively analyze the kinetic of CO 2 electrochemical reduction reaction, and thus provide a useful tool to guide the synthesis of catalyst as well as in-situ performance evaluation.
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DESALINATION
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2025
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IF 9.8
Yingqi Wang,Wenxin Lu,Hanyi Hou,Fei Yao,Xiaorui Li,Xin Du,Xingang Wang,Hongliang Dai,Hongya Geng
Widespread access to solar-driven steam generation requires monolithic structures with enhanced light absorption, water transportation, and heat allocation. However, the precise assembly of building blocks necessary for this integration remains a considerable challenge. This study develops a superior covalent tensor hydrogel (CTH) consisting of microgels prepared using a microfluidic device. Our self-semisacrificial approach employs chitosan and polyethene glycol as linkers to automatically assembly their microgels, which can be further precisely regulated through ultrasonic treatment and ultraviolet irradiation. The hierarchically porous CTH features a rough upper layer that enhances light absorption and a hierarchically porous hydrogel matrix that localizes heat, promoting energy absorption and thermal management. This design enhances interfacial solar light absorption and thermal insulation, with a low thermal conductivity of 0.3 W m −1 K −1 , achieving a maximum evaporation rate of 3.1 kg m −2 h −1 . The vertical distribution of microgels within CTH creates a gradient capillary force, effectively driving water transport to the interface and enabling self-cleaning properties for prolonged effective water evaporation. This CTH monolith represents a highly effective replacement for current hydrogels in effective green solar energy usage.
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Materials Today Communications
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2024
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IF 3.7
Kexin Zhang,Qiang Wang,Jiapeng Wang,Zichen Xu,Zhixia Wang,Lin Wang,Zhaoyue Tian,Yongbo Deng,Zhijia Zhang,Songsong Zhang,Mingzhu Chen,Longyu Hao,Hao Wei
Designability of glass fiber (GF) for microwave absorption is frequently neglected in buoyancy matrixes, which overcomes difficulties for their poor polarization loss to realize lightweight and efficient microwave absorption performance. In this study, GF coated with polypyrrole shell (GF@PPy) for multi-layered interface was successfully prepared through surface etching GF and then in-situ growth of PPy. According to the etching process of GF, GF@PPy-t40 (NaOH concentration with 16.67 mol/L, etching time with 40 min) demonstrates the efficient microwave absorption performance. Minimum reflection loss (RL min ) of GF@PPy-t40 (-10.40 dB, 3.0 mm) is 1.5 times that of GF@PPy-w10 (NaOH concentration with 2.78 mol/L) and 1.2 times that of GF@PPy-t60 (etching time with 60 min), which is ascribed to the enhancement of polarized sites caused by surface defects through appropriate etching concentration and time for NaOH. Based on the above etching conditions, we controlled the loading of in-situ polymerized PPy on GF through adjusting the concentration of pyrrole, realizing the impedance matching of 20 wt% GF@PPy in paraffin ring. GF@PPy-c60 (pyrrole concentration as 1.5 g) possesses the best microwave absorption performance, its RL min is up to −30.40 dB (14.96 GHz, 1.5 mm) and effective absorption bandwidth (EAB) reaches to 4.8 GHz, which is ascribed to its excellent impedance matching. Especially, the density of GF@PPy-c60 can reach to 1.65 g cm −3 , which is far below that of commercial GF (2.4–2.7 g cm −3 ). This modification lighters GF and effectively enhances microwave absorption performance, providing a basis for the radar stealth of GF in the marine environment.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2024
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IF 2.7
Miaotian Long,Zerui Zhang,Long Yan,Liang Yi
For effectively strengthening the comprehensive properties of intumescent flame-retardant epoxy resins (EPs), a microencapsulating γ-Fe 2 O 3 by polypyrrole (PPy) named PPy-Fe 2 O 3 was synthesized and used as a synergist to simultaneously enhance the flame retardancy, smoke toxicity suppression and mechanical strength of EP composites containing diaminodiphenylmethane modified ammonium polyphosphate (DDP). The results demonstrate that the mixture of PPy-Fe 2 O 3 and DDP exhibits a surprising synergistic effect on strengthening the comprehensive properties of EP composites. Specifically, EP composite containing 0.2 wt% PPy-Fe 2 O 3 and 9.8 wt% DDP achieves the UL94 V-0 rating with a limiting oxygen index (LOI) value of 35.5%, while 10 wt% DDP only imparts a UL94 V-1 rating and a LOI value of 34.0% to EP. Furthermore, 0.2 wt% PPy-Fe 2 O 3 shows a 11.0% reduction in peak smoke production rate and a 12.3% reduction in peak heat release rate of the EP/DDP system. The enhanced fire security of EP/DDP/PPy-Fe 2 O 3 is attributed to the formation of more phosphorus-rich structures retained in the char, thus reducing the release of harmful gases including NH 3 , CO, and CO 2 , and generating more incombustible gases including H 2 O to weaken burning intensity. Meanwhile, the satisfactory compatibility of PPy-Fe 2 O 3 with epoxy matrix imparts a superior mechanical strength to EP composites.
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ACS ES&T Water
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2024
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IF 4.8
Tian Wu,Wanhui Shi,Yunzhen Chang,Ying Zhang,Yue Zhang,Yanping Li,Sheng Zhu,Fengzhen Yuan,Gaoyi Han
Solar interface evaporation is considered an innovative and effective technology for combating global freshwater scarcity, with its effectiveness primarily hinging on the efficiency of photothermal materials. Here, we designed a solar evaporation device comprising a sponge layer for water collection and a polypyrrole (PPy) layer chemically deposited on a single-sided flannel (PPy@SSF) for sunlight absorption. The fiber array within PPy@SSF facilitates to absorb light energy, establishing a heating interface between the light absorption layer and the water. The sponge layer not only aids in water collection but also serves as a thermal insulation layer, preventing heat dispersion. The resulting device exhibits characteristics such as high water evaporation, robust stability, and resistance to salt. The daily water output reaches 8.12 kg m–2 under direct sunlight. In desalinating simulated seawater, the ion concentrations in the condensed water were reduced by 4 orders. Furthermore, heavy metal ions in purified water from sewage were reduced by at least 3 orders of magnitude. Additionally, the properties of the device showed no attenuation after being used repeatedly 10 times under 1 sun. Our research provides a platform with high photothermal conversion efficiency for seawater and sewage purification.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Qiang Wei,Wang Sun,Zhe Zhang,Guofu Zhou,Zhen Zhang
Phase change materials (PCMs) are promising for thermal energy storage due to their high latent enthalpy and constant phase change temperature. However, organic PCMs suffer from leaking, low thermal conductivity, and flammability. Herein, high thermal conductivity, photothermal and flame-proof docosane microcapsules with melamine-formaldehyde (MF) and polypyrrole (PPy) (C 22 -CMFP) were reported with cellulose nanocrystal (CNC) stabilized Pickering emulsion droplets as templates through in-situ polymerization. CNCs showed outstanding C 22 Pickering emulsifying ability with the presence of NaCl and provided ideal templates for C 22 microcapsules. The obtained C 22 -CMFP microcapsules displayed high enthalpy (205.7 J/g), C 22 core ratio (86.1 %), and stability. The C 22 -CMFP microcapsules retained an outstanding enthalpy remaining ratio (98.9 %) after 100 times cooling/heating cycles and could tolerate 100 °C for 12 h without leaking due to the robust hybrid CMFP shell. PPy significantly improved the thermal conductivity and photothermal conversion efficiency of C 22 -CMFP microcapsules. The C 22 -CMFP microcapsules exhibited a high thermal conductivity of 0.683 W/(m·K). The maximum temperature of C 22 -CMFP microcapsules under light irradiation for 18 min was 60.4 °C. Moreover, C 22 -CMFP microcapsules showed superb flame-proof properties. This study provides a facile approach to fabricate high enthalpy, stable, thermal conductive, photothermal, and flame-proof PCM microcapsules for solar harvesting and thermal energy storage.
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ACS Applied Electronic Materials
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2024
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IF 4.3
Xiao-xuan Fan,Mei-Chen Lin,Jia-Horng Lin,Xiangdong Fu,Xiaoyang Zhang,Baolei Shen,Xilin Liao,Lu Zhang,Ting-Ting Li,Ching-Wen Lou
The practical application of yarn electrode materials has been restricted because of the inherent insulating properties and adverse electrochemical properties of conventional yarns. The aim of the study was to make yarn electrodes with higher specific capacitance and construct a type of yarn-like manganese dioxide (MnO2) electrode. In this work, polyacrylonitrile-wrapped carbon fibers (CFs) core-spun yarn (CFP core spun yarn) was prepared by electrospinning with CF yarn as the base material. The highly conductive yarn (CFPP yarn) was then prepared by depositing polypyrrole nanoparticles by in situ polymerization on top of the CFP cored yarn. Finally, based on CFPP yarn, the CFPP@MnO2 yarn cathode material was prepared by coating MnO2 on CFPP yarn by an impregnation coating method. The CFPP@MnO2 yarn cathode showed outstanding electrochemical performance in the three-electrode system test, maintaining 89.76% of the initial capacity after 100 charge–discharge cycles at a current density of 1 mA cm–1, which indicates that the CFPP@MnO2 yarn cathode has outstanding cycling stability. The yarn cell can therefore be used as the cathode electrode for yarn batteries, providing an effective strategy for applications in smart textiles and wearable electronics.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Tiantian Li,Zhining Huang,Mengfan Hu,Yuen Hu,Ke Quan,Man Zhou,Yao chen,Shaoju Fu
Heavy metal wastewater pollution has been a globally important and serious issue for the industrial manufacturing center. Herein, we developed a novel CAP@Ui0-66-NH 2 @PPy nanocomposite fibrous membrane, by combining the in-situ growth and oxidative polymerization technical routes, which possessed a high specific surface area and abundant amino-active sites to remove Cr (Ⅵ). Systematic characterization showed that the porous structure and in situ growth of MOF provided sites for polymerization of charged polypyrrole (PPy), resulting in the large specific surface area (78.837 m 2 /g) of CAP2@Ui0-66-NH 2 @10 %PPy. The maximum adsorption capacity was as high as 312.70 mg/g at 298 K, which was significantly better than that of CAP (CA and PVP electrostatic spinning and then washing off the PVP) nanomembranes. The adsorption process was consistent with the proposed secondary kinetic and Langmuir model, and the high adsorption capacity was maintained after five rounds of cyclic adsorptions. Through XPS analysis, the abundant amino groups on the surface of the adsorbent material were protonated, caused the electrostatic attraction and ion-exchange interaction with the anion Cr(Ⅵ). These protonated amino groups were able to reduce the toxic Cr (Ⅵ) to non-toxic Cr (Ⅲ), which was immobilized on the surface of the material through chelation. The MOF lattice achieved in-situ growth on porous CA nanofibrous membranes, which significantly enhances the mass-transfer dynamics and the membrane cycling stability, the amine-based functionalization of the UI0-66-NH 2 improved the coordination activity and increased the adsorption efficiency, and polypyrrole (PPy) conductive layer promoted the directional migration of Cr (VI) and effectively suppressed the interference of competing ions. In sum, the prepared CAP@Ui0-66-NH 2 @PPy hybrid fibrous membranes showing great potentially applicable for heavy-metal wastewater treatment.
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Journal of Physical Chemistry C
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2024
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IF 3.3
Tongxin Xiao,Xige Wu,Hongbao Liang,Kangyue Qiao,Ying Chen
Solar-powered photocatalytic conversion of CO2 into green solar fuels is one of the effective ways to solve the global energy crisis and the greenhouse effect. A new artificial photosynthesis system composed of TiO2 nanotube arrays (TiO2NTs) and bimetallic porphyrin was fabricated, and their photocatalytic activities were evaluated by the reduction of gas-phase CO2 to CH4 under simulated solar irradiation. Compared to pure TiO2NTs and CoTCPP/TiO2NTs, bimetallic porphyrin-sensitized TiO2NTs displayed greatly ameliorated photocatalytic activity. Among them, Ni-CoTCPP/TiO2NTs exhibited the highest photoreduction efficiency, and the reduction rate of CO2 into CH4 was up to 52.27 μmol/cm2/h with the quantum efficiency of 1.002%, about 7 times higher than that of pure TiO2NTs. The increase in photocatalytic performance can be attributed to the enhancement of the light absorption capacity of Ni-CoTCPP/TiO2NTs and the higher charge separation efficiency. Furthermore, according to the results of the photocatalytic evaluation and photo(electro)chemical studies, a possible mechanism of CO2 photoreduction over Ni-CoTCPP/TiO2NTs was proposed.
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DESALINATION
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2024
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IF 8.3
Zhihui Yang,Chenxi Han,Yue Zheng,Yibing Chen,Weiming Wang,Xue Min,Jun Xiong,Ming Li
Interfacial solar desalination (ISE) emerges as a promising strategy to tackle the worldwide freshwater shortage. However, developing cost-effective solar evaporators that demonstrate exceptional evaporation rates while maintaining high salt-resistance is a tremendous challenge. This study introduces a three-dimensional (3D) solar evaporator, referred to as PPy-WMS, which is developed by employing a straightforward solution reaction to decorate polypyrrole (PPy) onto a waste mop sponge (WMS). The 3D PPy-WMS solar evaporator can capture ambient energy. When the exposure height is 6 cm, the PPy-WMS achieves an exceptional evaporation rate of 3.66 kg m −2 h −1 under 1-solar intensity. The macropore structure in WMS promotes water transport and facilitates salt ions backflow, resulting in high salt-resistance. The evaporation rate maintains at 2.91 kg m −2 h −1 when desalinating simulated seawater (20 wt%). Outdoor desalination experiments exhibit that 1 m 2 of PPy-WMS can extract about 15 kg of freshwater per day. This economical and straightforwardly designed solar evaporator exhibits outstanding salt-resistance, presenting a viable remedy to address global freshwater scarcity.
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Analytical Methods
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2024
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IF 2.7
Bao-Kang Jin,Jiajia Wang,Chun Kan
In this paper, a proportional electrochemical biosensor based on cadmium telluride/ polypyrrole (CdTe/PPy) nanocomposite is developed for the detection of MUC1 with high selectivity and sensitivity. The result indicates that CdTe/PPy nanocomposite is modified on the surface of glassy carbon electrode (GCE), which supplies a large surface area for immobilizing cap-DNA, ensuring its high selectivity and sensitivity. Whereafter, CdTe linked sig-DNA (MUC1 aptamer) is introduced, allowing MUC1 aptamer to hybridize with cap- DNA. CdTe as signal amplification elements in order to generate the differential pulse voltammetry (DPV) signal. Conceivably, the target MUC1 detection was based upon the current signal change due to the quantities change of the signal amplification elements CdTe. In the presence of MUC1, the MUC1 aptamer specifically binds to MUC1, resulting in the release of CdTe-sig-DNA from the electrode surface and the decrease of peak current. Under the optimized experimental conditions, the electrochemical biosensor present a highly selective, sensitive, stability and reproducibility for the MUC1 from the range of 0.1 nM to 100 nM with detection limit of 0.05 nM (S/N = 3). Therefore, the electrochemical biosensor has a potential application in medical disease diagnosis application detection.
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