ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Luying Chen,Liushan Luo,Zhiping Mao,Bijia Wang,Xueling Feng,Xiaofeng Sui
Flexible electrothermal composite phase change materials (PCMs) are promising candidates for portable thermotherapy. However, a great challenge remains to achieve high PCM loading while maintaining reasonable flexibility. Herein, the polypyrrole-decorated melamine foam (PPy@MF) was fabricated and thereafter applied to confine binary PCM mixtures composed of a high-enthalpy long-chain polyethylene glycol (PEG4000) and its short-chain homologue (PEG200) to make the novel PPy@MF-PEG4000+200 composite PCM. At a high loading of up to 74.1% PEG4000 and a high latent heat energy storage density of 150.1 J/g, the composite PCM remained flexible at temperature (−20 °C) far below its phase transition point thanks to the plasticine effect of PEG200. The composite also demonstrated good Joule heating performance, providing fast heating from 28 to 70 °C at low applied voltages (4.5–6.0 V). The energy could be stored efficiently and released to maintain the composites at the proper temperature. The electrothermal performance of the composite remained undisturbed during curved or repeated bending, showing good potential to be used for personal thermal management and thermotherapy.
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高影响因子
RARE METALS
·
2025
·
IF 11
Yin Hong,Xiao Bo,Yu Zhi-Peng,Cunha Joao,Çaha İhsan,Zhang Tian-Qi,Hou Zhao-Hui,Li Gang-Yong
Cubic phase cobalt disulfide (CoS 2 ) is recognized as a potential negative material for sodium-ion batteries (SIBs) because of its low band gap, simple synthesis process, and high capacity. Nonetheless, the challenges of slow ion diffusion and substantial volume change during cycling, resulting in inadequate rate and cycling performances, remain unresolved. Here, a porous structure is fabricated by etching electrospun carbon nanofibers, subsequently facilitating the growth of CoS 2 nanoparticles at the pore locations. A nitrogen-doped carbon layer is then applied to the surface to buffer the volumetric expansion effect of CoS 2 . The findings indicate that the carbon nanofibers establish a stable conductive network, while the porous architecture of the carbon fibers, in conjunction with the carbon coating, efficiently mitigates volumetric expansion. Furthermore, density functional theory (DFT) studies show the presence of an interlayer van der Waals force between the sulfur atoms in CoS 2 and the carbon atoms, which reduces the band gap, enhances the conductivity of the structure, and lowers the energy barrier of Na + migration. The as-prepared anode achieves a reversible capacity of 302.6 mAh g −1 at 3.2 A g −1 and maintains a capacity of 384.6 mAh g −1 at 1.0 A g −1 over 800 cycles, demonstrating exceptional rate performance and improved cycling stability. This work shows that the combination of hierarchical porous architecture and a unique electronic structure offers valuable insights for designing high-performance negative materials for SIBs. Graphical abstract
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JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Pengfei Liao,Dengjie Zhong,Yunlan Xu,Ran Jiang,Jiayou Zhang,Yuanzhen He
In this work, in order to improve the adsorption capacity of chitosan for Cr(VI), a chitosan-based composite co-modified with lanthanum and polypyrrole (CS-La-PPy) was prepared and its effectiveness in removing Cr(VI) from aqueous solution was investigated. CS-La-PPy was characterized by FT-IR, XRD, BET, SEM, EDS and XPS. The successful synthesis of CS-La-PPy was confirmed by the presence of C=C (pyrrole ring) and La-O in the FT-IR spectrum. The effects of different adsorbent materials, dosage, initial pH, coexisting ions, adsorption time and temperature on the removal of Cr(VI) were investigated by batch experiments. The removal efficiency of 50 mL Cr(VI) with concentration of 150 mg L −1 by CS-La-PPy is 95.28 % at pH=2.0, T = 298 K. The adsorption process is spontaneous, which is consistent with pseudo-second-order kinetic model and Freundlich adsorption isotherm model. The maximum adsorption capacity is 321.96 mg g −1 . XPS analysis showed that the removal mechanism of Cr(VI) by CS-La-PPy was mainly based on the electrostatic adsorption between Cr(VI) and lanthanum, -NH 2 + , and -NH 3 + , the ion exchange between Cr(VI) and Cl − , the reduction of Cr(VI) to Cr(III) by PPy 0 and -OH groups, and the complexation between Cr(III) ions and COO- groups. This work provides a reference for the design and preparation of efficient chitosan-based adsorption materials.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
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IF 9
Hongwei Ge,Dafan Chen,Mutai Bao,Dan Zhang,Zhenzong Lu,Xiuping Chen,Yiming Li
The unique stability and complexity of oil-in-water (O/W) nanoemulsions originating from various fields of life and production pose significant challenges for their separation. In this work, a novel oil/water separation membrane (MFC/PPy/Ni–Co–P) is constructed by loading polypyrrole (PPy) particles on cellulose (MFC) membranes to provide growth sites for Ni–Co–P alloys, so as to endow the membrane with in situ bubble-generating capability. Under the external electric field, the MFC/PPy/Ni–Co–P membrane is integrated into the electroflotation filtration system as a cathode, and the effective membrane cleaning and demulsification of nanoemulsions can be realized through the micro-aeration environment constructed in situ . The MFC/PPy/Ni–Co–P membrane demonstrates outstanding performance in gravity-driven separation of various oil/water mixtures, with a rejection rate of >99.99 % and a flux of >3000 L∙m −2 ∙h −1 . The interaction energy between oils with different viscosities and membranes is quantified by the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory, revealing the dominant role of acid-base interactions in the anti-fouling process. Notably, the integration of MFC/PPy/Ni–Co–P membrane into an electroflotation separation system enables the coalescence and separation of small-sized, highly stable nanoemulsions with separation efficiencies of >99.86 %. This study provides a novel approach for simultaneous and efficient nanoemulsion separation and membrane fouling remediation, showing a great potential in the development of efficient and sustainable oil/water separation technologies.
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Peng Lv,Yuqi Sheng,Yunrui Xie,Yaolin Hu,Hexuan Wang,Xintong Huo,Xiang Li,Haina Qi,Wensheng Yu,Xiangting Dong
Multi-functionalized thermochromic materials will greatly expand their application scopes. In this work, two functions of electrical conductivity and fluorescence are innovatively integrated into a thermochromic material by designing specific “macro + micro” Janus structures. Tri-functional thermochromic-anisotropic conductive-fluorescent thermochromic microcapsules-45 °C (TCM-45)/polymethyl methacrylate (PMMA) microfibers non-array&{[polypyrrole (PPy)/PMMA]//[Coumarin/PMMA] Janus microfibers array} up-down Janus film (named as TCFJAJF) is constructed by two-step electrospinning techniques of “single axis + parallel axis”. The up layer of TCFJAJF is TCM-45/PMMA microfibers non-array film (defined as U-TCFJAJF, viz. thermochromic layer) and the down layer of TCFJAJF is [PPy/PMMA]//[Coumarin/PMMA] Janus microfibers array film (denoted as D-TCFJAJF, viz. anisotropic conductive-fluorescent layer). The macroscopic up-down Janus structure eliminates the mutual influences between D-TCFJAJF and U-TCFJAJF. U-TCFJAJF has excellent color conversion and fading/coloring performances, achieving a reversible and multiple colors conversion from blue to white upon heating from 25 to 45 °C. A new concept of “transient thermal printing” is proposed based on fast thermal coloring/fading conversion of thermally printed patterns on film. Meanwhile, the microscopic Janus microfiber structure of D-TCFJAJF largely alleviates absorption to the excitation light and emission light of Coumarin by PPy and influence of Coumarin on conduction of PPy, ensuring the intense fluorescence and high conductivity. Due to the ordered arrangement of Janus microfibers, D-TCFJAJF has excellent anisotropic conductivity. As a demo application, TCFJAJF as a conductor can light up LED bulbs in a microcircuit and emit bright blue fluorescence under UV light excitation, achieving the working state visualization of the conductive microcircuit in dark surroundings. The multi-functionalized thermochromic film will have huge application prospects in fields of temperature monitoring, transient information reading and displaying, flexible electronics, fluorescent labeling and thermal-fluorescent dual encryption anti-counterfeiting, etc.
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高影响因子
Materials Chemistry Frontiers
·
2024
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IF 6
Cijun Shuai,Feng Ding,Xiaosong Chen,Huarui Zhou,Hongyi Qian,Yifeng Wang,Yanyan Chen,Fangwei Qi,Xinna Bai
As a photoelectric material, bismuth sulfide (Bi2S3) can convert light signals into electrical signals and thus hold tremendous promise in constructing wireless electrical stimulation to accelerate nerve regeneration. However, the easy recombination of electrons and holes weakens the electrical stimulation effect. Herein, core–shell Bi2S3@PPy nanorods were prepared via the in situ hydrothermal polymerization of conductive polypyrrole (PPy) on Bi2S3 and were then blended into poly-L-lactic acid powder to fabricate a nerve conduit via laser additive manufacturing. Under a rotating magnetic field, conductive Bi2S3@PPy in the conduit could cut the magnetic inductance line to generate induced electromotive force that could drive the electrons and holes of Bi2S3 in opposite directions, thereby achieving efficient separation. Results indicate that the enhanced electron–hole separation boosted photocurrent generation, with an output current of 7.5 μA, which was significantly higher than the photocurrent under light irradiation (5.0 μA) and the induced current under magnetic field (2.5 μA). Immunofluorescent staining demonstrated that the enhanced photocurrent could up-regulate the expression of neuronal markers Nestin and GFAP. Moreover, the intracellular influx of Ca2+ was improved, which indicated that the differentiation of BMSCs into neurons was promoted. Overall, this work provides a potential wireless electrical stimulation strategy for accelerating nerve repair.
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高影响因子
CELLULOSE
·
2024
·Vol. 31
·期 17
·10375-10388
·
IF 4.9
Hong Dican,Li Gaosheng,Wei Xuanru,Sun Chenyu,Shi Zhuqun,Yang Quanling,Xiong Chuanxi
Electronic skin, as an intelligent material capable of simulating human skin functions, plays a crucial role in long-term stable health monitoring, human–computer interaction, and medical devices. However, to achieve the application of highly functional electronic skin, there remains a challenge in fabricating pressure sensors that simultaneously possess flexibility, vapor permeability, and exhibit excellent sensing capabilities. Herein, we prepared a dispersion of 2,2,6,6-tetramethylpiperidinyl-1-oxy oxidized cellulose nanofiber (TOCN) and hollow polypyrrole (hPPy) microspheres prepared through the template method. The hydrogel films were obtained by a simple blending approach and Ca 2+ crosslinking followed by drying. The resulting TOCN/hPPy hydrogel films exhibited good mechanical properties, exceptional flexibility, and reliable vapor permeability. Notably, the developed piezoresistive pressure sensor demonstrated a sensitivity of 2.08 kPa −1 , along with a fast response time (90 ms) and recovery time (150 ms). Furthermore, the sensor exhibited a low detection limit of 7.8 Pa, excellent stability at high pressures, and long-term cycling stability of up to 12,500 cycles. Graphical abstract
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Rui Zhu,Peng Sun,Guofeng Cui,Jie Zhao,Yaoguang Yu
Ion transportation via the mixed mechanisms of hydrogels underpins ultrafast biological signal transmission in nature, and its application to the rapid and sensitive sensing detection of human specific ions is of great interest for the field of medical science. However, current research efforts are still unable to achieve transmission results that are comparable to those of bioelectric signals. Herein, 3D interconnected nanochannels based on poly(pyrrole-co-dopamine)/poly(vinyl alcohol) (P(Py-co-DA)/PVA) supernetwork conductive hydrogels are designed and fabricated as stimuli-responsive structures for K+ ions. Distinct from conventional configurations, which exhibit rapid electron transfer and permeability to biosubstrates, interconnected nanofluidic nanochannels collaborated with the P(Py-co-DA) conductive polymer in the supernetwork conductive hydrogel significantly improve conductivity (88.3 mS/cm), ion transport time (0.1 s), and ion sensitivity (74.6 mV/dec). The faster ion response time is attributed to the synergism of excellent conductivity originating from the P(Py-co-DA) polymer and the electronic effect in the interconnected nanofluidic channels. Furthermore, the supernetwork conductive hydrogel demonstrates K+ ion selectivity relative to other cations in biofluids such as Na+, Mg2+, and Ca2+. The DFT calculation indicates that the small solvation energy and low chemical transfer resistance are the main reasons for the excellent K+ ion selectivity. Finite element analysis (FEA) simulations further support these experimental results. Consequently, the P(Py-co-DA)/PVA supernetwork conductive hydrogels enriched with the 3D interconnected nanofluidic channels developed in this work possess excellent sensing of K+ ions. This strategy provides great insight into efficient ion sensing in traditional biomedical sensing that has not been explored by previous researchers.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Ziqiang Zhang,Tiancheng Liu,Fengquan She,Yulong Jiao,Yuanming Wang,Guohui Yuan
Aqueous zinc-ion batteries (AZIBs) are ideal for next-generation energy storage due to low cost, safety, and eco-friendliness, but Zn anode issues like dendrites, hydrogen evolution, and corrosion limit their lifespan. This study engineers a low-cost multifunctional nitrogen-doped porous carbon (NC) interface layer with a three-dimensional (3D) zincophilic structure and a hydrophobic, negatively charged surface for Zn anode. Its conductive 3D structure enables the uniform distribution of the electric field, suppressing dendrite formation and promoting even Zn 2+ deposition. On the one hand, the hydrophobic surface minimizes water-zinc interactions, while on the other hand, the negative charge facilitates selective Zn 2+ transport and repels sulfate anions, thereby significantly reducing hydrogen evolution and corrosion. Additionally, rich zincophilic sites not only lower the deposition overpotential but also induce (002) crystal-oriented growth, further stabilizing the interface and extending battery life. As a result, symmetric cells assembled with NC-coated Zn electrodes exhibit an impressive cycling life of over 2800 h at a current density of 2 mA cm −2 . At higher current densities (10 and 20 mA cm −2 ), the cells maintain cycling lifetimes of over 1300 and 1000 h, respectively, demonstrating exceptional stability. This work is expected to provide a simple, practical and scalable strategy for developing efficient and stable AZIBs.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xiaorui Wang,Hao Li,Wenhui Fu,Qiushi Chen,Xuzhong Gong,Zhi Wang,Junhao Liu
Binders provide a straightforward and efficient strategy to mitigate the significant challenge of volume expansion in silicon anodes for lithium-ion batteries. To improve the cycle life of silicon anodes, a cross-linked binder carboxymethyl cellulose–phytic acid–pyrrole (CMC-DP) is designed and synthesized using carboxymethyl cellulose, phytic acid, and pyrrole. The numerous hydroxyl groups in phytic acid provide abundant binding sites for the formation of hydrogen and ester bonds. The formation of hydrogen bonds and covalent bonds enhances the mechanical properties of the adhesive. The amino groups in the binder form N Si O covalent bonds with silicon particles, while the hydroxyl and carboxyl groups form (COO) 2 Cu and (OH) 2 Cu coordination bonds with the copper foil, enhancing interfacial adhesion. When the CMC-DP10 (10 µL pyrrole) binder is applied to silicon nanoparticles (∼30 nm), the specific capacity of the electrode can be maintained at around 1700 mAh/g after 500, whereas the CMC binder achieves only ∼100 mAh/g under the same conditions. This work demonstrates that the CMC-DP binder exhibits strong adhesion to both silicon nanoparticles and copper foil.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Xiaotong Shi,Zhangheng Wang,Wenbin Song,Xiaofeng Hao,Delin Sun
Developed highly efficient heating products with a fast heating rate, high FIR emissivity, and stable heat generation have a wide range of applications. This study systematically investigates the effects of varying contents of carbon nanotubes (CNT) and far-infrared nanocomposites (FIR-NCP) on the performance of far-infrared electric wood (FIR-EW). The experimental results indicate that as the content of CNT and FIR-NCP increases, the temperature rise, FIR emissivity, electrical resistance, and weight gain rate of FIR-EW significantly improve. Notably, when CNT and FIR-NCP are added together, the FIR emissivity rapidly increases to 98–99 %. Under a voltage of 20 V, the temperature of FIR-EW rises quickly within 3 minutes, demonstrating excellent electric thermal conductivity. Scanning electron microscopy (SEM) analysis shows that CNT and FIR-NCP are uniformly distributed within the wood matrix, forming an interconnected network that enhances the overall performance of the wood. Fourier transform infrared spectroscopy (FTIR) analysis further confirms the changes in functional groups of the wood after chemical treatment, indicating that CNT, PPy, and FIR-NCP successfully bond with the wood substrate. The findings provide important theoretical foundations and practical guidance for the development of high-performance electric wood.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Weijie Lin,Han Han,Xilai Yan,Jie Xie,Hongshen He,Shibo Han,Dengwen Ning,Ajoy Kanti Mondal,Shuai Wu,Fang Huang
The preparation of natural polymer-based highly conductive hydrogels with reliable durability for applications in supercapacitors (SCs) is still challenging. Herein, a facile method to prepare alkaline lignin (AL)-based polypyrrole (PPy)-rich, high-conductive PPy@AL/PEGDGE gel was reported, where AL was used as a dopant , polyethylene glycol diglycidyl ether (PEGDGE) as a cross-linking agent, and PPy as a conducting polymer . The PPy@AL/PEGDGE gel electrode materials with hollow structures were prepared by electrochemical deposition and chemical etching method and then assembled into sandwich-shaped SCs. Cyclic voltammetry (CV), galvanotactic charge discharge (GCD), electrochemical impedance spectroscopy (EIS) and cycling stability tests of the PPy@AL/PEGDGE SCs were performed. The results demonstrated that the SCs can achieve a conductivity of 25.9 S·m −1 and a specific capacitance of 175 F·g −1 , which was 127.4 % higher compared to pure PPy (77 F·g −1 ) electrode. The highest energy density and power density for the SCs were obtained at 23.06 Wh·kg −1 and 5376 W·kg −1 , respectively. In addition, the cycling performance was also higher than that of pure PPy assembled SCs (50 %), and the capacitance retention rate can reach 72.3 % after 1000 cycles. The electrode materials are expected to be used as sensor and SCs devices.
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高影响因子
危险品化学品经营许可证（带存储）