BULLETIN OF MATERIALS SCIENCE
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2025
·Vol. 48
·期 1
·1-13
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IF 2.1
Lu Ning,Wang Yuyu,Song Gongji,Zhang Zifan,Li Pengfei,Wang Jiannan,Xu Jianmei
Conductive scaffolds are gaining increasing attention in peripheral nerve repair for their good biocompatibility and electrical properties similar to those of normal nerves. In this study, silk fibroin (SF) nanofibre mats coated with polypyrrole (PPy) were prepared through electrospinning and chemical polymerization. Scanning electron microscopy (SEM) showed even and firm coating of PPy around the nanofibres, and fourier transform infrared spectroscopy (FTIR) analyses of the conductive mats confirmed the presence of hydrogen bonds or electrostatic interactions between PPy and SF. The conductivity of the composite mats could be regulated by varying the pyrrole monomer concentration from 10–20 mM, resulting in corresponding changes in conductivity from 9.4 ± 3.4 × 10 –5 to 4.6 ± 1.0 × 10 –3 S cm –1 . The mechanical strength, hydrophilicity and biodegradability of the mats exhibited similar changing trends. Biodegradability tests showed weight losses of 51.2, 13.6, 11.2 and 15.1% for composite mats with varying PPy coating rates on the 28th day, revealing that the biodegradability can be regulated and optimised by varying the pyrrole concentration. Schwann cell culture confirmed that the SF/PPy mats improved cell proliferation and adhesion compared to pure SF mats. The results demonstrate that the SF/PPy mats, with nanoscale surface, excellent biocompatibility, conductivity and controllable biodegradability, represent promising materials with potential for use in peripheral nerve regeneration. Graphical
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2025
·
IF 4.6
Yiqing Wu,Xiangmei Ma,Bin Wang,Yanan Li,Shengtao Gao
The detrimental effects of ultraviolet (UV) and electromagnetic (EM) radiation on human health and physiological functions are well documented. The development of efficient shielding materials to mitigate these effects is therefore an urgent necessity. In this study, Zn/Ti-LDH@Ce/Fe-MOF@PPy composites were successfully prepared by hydrothermal synthesis and interfacial polymerisation. The properties of the composites were compared and analysed with those of pure Zn/Ti-LDH and Ce/Fe-MOF, and the results show that the prepared materials have excellent comprehensive properties, with a broad EAB of 5.2 GHz and a RL min of −46.2 dB at 14.8 GHz at the thickness of 3 mm, while exhibiting excellent UV shielding capability.The present study offers novel concepts and efficacious methodologies for the engineering of high-performance microwave absorbing and UV shielding materials.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhiying Gao,Chuang Wang,Yanjuan Dong,Juming Yao,Qingling Mi,Dan Ge,Lu Yang,Hou-Yong Yu
Novel in-situ freeze polymerization assisted layer-by-layer self-assembly method was utilized to prepare robust regenerated cellulose fiber-polypyrrole (RCF-PPy) composite fibers with high-conductivity, where transverse-longitudinal polypyrrole growth on RCF was regulated by using Lewis acid FeCl 3 in crystalline ice state with the template etching and oxidation effects. The RCF-PPy3 exhibited high strength (1.01 cN/dtex) and exceptional durability, withstanding mechanical deformation, friction (100 cycles), and ultrasonic washing (50 times), addressing the issues of poor interface adhesion and conductivity stability of conductive fibers. Furthermore, the composite fiber demonstrated high electrical conductivity of 87.66 mS cm −1 and outstanding sensing performances for monitoring strain, pressure, temperature (0.34 %/°C), and humidity (0.895 %/RH). Based on RCF-PPy3, a pressure sensor was constructed as a human–machine interface electronic device, achieving sedentary reminders, fingertip information transmission, indicating great potential applications in intelligent wearable fiber electronic devices.
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RSC Advances
·
2024
·Vol. 14
·期 12
·8445-8453
·
IF 3.9
Xiaoyun Huang,Zhiming Liu,Weijian Zeng,Xiaoyu Ma,Yu Zhang,Muye Li,Jiutong Sun,Sheng Mao,Li Bian
Fenton catalytic medicine that catalyzes the production of ·OH without external energy input or oxygen as a substrate has reshaped the landscape of conventional cancer therapy in recent decades, yet potential biosafety concerns caused by non-safety-approved components restrict their clinical translation from the bench to the bedside. Herein, to overcome this dilemma, we elaborately utilizate safety-approved hetastarch, which has been extensively employed in the clinic as a plasma substitute, as a stabilizer participating in the copper chloride-initiated polymerization of pyrrole monomer before loading it with DOX. The constructed DOX-loaded hetastarch-doped Cu-based polypyrrole (HES@CuP-D) catalyzes the excess H2O2 in tumor cells to ·OH through a Cu+-mediated Fenton-like reaction, which not only causes oxidative damage to tumor cells but also leads to the structural collapse and DOX release. Additionally, HES@CuP-D together with laser irradiation reinforces tumor killing efficiency by hyperthermia-enhanced catalytic activity and -accelerated drug release. As a result, the developed HES@CuP-D provides a promising strategy for Fenton catalytic therapy with negligible toxicity to the body.
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PubMed
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Yuxin Shi,Libo Tong,Jinghui Chu,Xiangjun Li,Bing Zhang,Kuaishe Wang
The existence of intrinsic defects in organic coating easily causes the degradation of protective ability during long-term corrosion process. A novel two-dimensional MXene (Ti 3 C 2 ) nanofiller can effectively reduce the defect density and contribute to the enhancement of anticorrosion performance, while its high conductivity may accelerate the galvanic corrosion between the organic coating and underlying substrate. In this work, a kind of three-dimensional (3D) Ti 3 C 2 MXene/polypyrrole composites (TPC) hybrid epoxy (EP) coating has been successfully fabricated on Mg alloy , which exhibits the excellent corrosion resistance and antistatic performance. The enhanced conductivity and synergistic barrier/passivation effect enable the Ti 3 C 2 MXene/polypyrrole composites with low surface resistance and excellent anticorrosion ability. Based on the electrochemical tests, the TPC/EP coating possesses remarkable impedance value with 7.73 × 10 10 Ω cm 2 after immersion for 14 days, representing the ability to extend service life due to the excellent physical barrier of Ti 3 C 2 nanosheets and the migration of electrochemical interface related to electronic transmission derived from polypyrrole (PPy) nano-particles. Moreover, the surface resistivity of the obtained coating is reduced to 2.76 × 10 8 Ω, which can be ascribed to the transmission effect of electrolyte ions through interlayer of Ti 3 C 2 /PPy network structure, and thus improving its antistatic performance. This work not only highlights the application of 2D MXene material as effective anticorrosion filler, but pave a new avenue for the development of organic/inorganic hybrid coating of Mg alloy or other metallic materials.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Mingxing Li,Xiaolan Liang,Peiying Xie,Chunzhi Zhang,Yunhua Chen,Chaoyang Wang,Li Zhou,Tao Wang,Hongxia Liu
Solar-powered interfacial evaporation is a developing and sustainable technique increasingly utilized in desalination and wastewater purification. This technology involves the creation of cellulose nanofiber (CNF)/polylactic acid (PLA) composite aerogels through the Pickering emulsion approach. Self-floating aero-hydrogel ( E -VGP) with a hierarchical porous structure was formed on a viscous mixture containing polyvinyl alcohol (PVA), peach gum polysaccharide (PGP), and polypyrrole (PPy) via an in-situ polymerization process. Furthermore, by modifying the hydrolysis time of PGP with a hyperbranched polyhydroxy structure, VGP hybrid hydrogels of varying microscopic molecular sizes were produced. Additionally, solar vapor generators (SVG) with diverse macroscopic structures were fabricated using molds. The V8G4-12hP0.2 hybrid hydrogel, synthesized using PGP hydrolyzed for 12 h, exhibited an evaporation enthalpy of water at 1204 J g −1 . This capacity effectively activates water and enables low enthalpy evaporation. Conversely, the macrostructural design allows the cylindrical rod raised sundial-shaped structure of SVG3 to possess an expanded evaporation area, minimize energy loss, and even harness additional energy from its nonradiative side. Consequently, this micro-macrostructural design enables SVG3 to attain an exceptionally high evaporation rate of 3.13 kg m −2 h −1 under 1 Sun exposure. Moreover, SVG3 demonstrates robust water purification abilities, suggesting significant potential for application in both desalination and industrial wastewater treatment.
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Nano-Micro Letters
·
2024
·Vol. 17
·期 1
·1-20
·
IF 31.6
Liu Yu-long,Zhu Ting-yu,Wang Qin,Huang Zi-jie,Sun De-xiang,Yang Jing-hui,Qi Xiao-dong,Wang Yong
Hierarchical melamine foam (MF)/polypyrrole (PPy) nanowire arrays (MF@PPy) were fabricated by electrochemical polymerization.
The 3D porous PPy micro-skeleton and the 1D PPy nanowire arrays imparted the MF@PPy foams with high electromagnetic interference shielding performance of 19,928.57 dB cm 2 g −1 via multiple attenuations.
The PPy nanowire arrays achieved multifunctional integration including hydrophobicity, thermal insulation, and dynamic infrared thermal camouflage properties.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Yujie Zhang,Ning Cai,Yuehan Wang,Hang Wang,Juanqin Xue
Capacitive deionization (CDI) technology holds immense promise for the effective removal of copper ions from solution medium. However, the widespread application of CDI is hindered by limitations arising from the electrode formation process, which impacts the electrode’s mass transfer and adsorption performance. In pursuit of refining the electrode formation process, this study employs a one-step simultaneous electrospinning and electropolymerization method to fabricate PPy/C-HCPs composite electrodes. The results indicate that the fabricated PPy/C-HCPs composite electrode possesses a high specific surface area of 458.98 m2/g, which is 1.83 times that of the electrode prepared using the traditional electrodeposition method (251.26 m2/g). Furthermore, the maximum adsorption capacity for Cu2+ reaches 82.83 mg/g, marking a 2.19-fold enhancement compared to electrodes prepared through the same electrodeposition process (37.81 mg/g). Moreover, even after 1000 repetitive scans, the electrode exhibits exceptional cyclic stability, with only a marginal 1.42% decrease in specific capacitance. This study introduces a streamlined process for the preparation of high-performance electrode materials, providing a foundation for the shaping applications of polypyrrole composite electrode. Additionally, it presents a distinctive approach for the preparation of electrodes for CDI and supercapacitors, offering a unique perspective in the field.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xin Xu,Ximing Guo
Dopamine (DA), uric acid (UA), and ascorbic acid (AA), three similar electroactive biological small molecules, generally coexist in human serum, causing serious interference when detected separately. In order to realize the simultaneous detection of DA, UA, and AA, three similar electroactive biomolecules, through the electrochemical sensing platform based on 2D Cu-TCPP MOFs nanofilms, DA molecules were successfully detected and optimized the detection conditions according to our previous detection methods for UA and AA. The results displayed the perfect electrochemical response signal of DA, excellent linear correlation between current intensity and DA concentration, LODs, repeatability, and stability. The electrochemical potential (E pa ) of UA oxidation peak was intermediate between E pa of AA and DA oxidation peak, the response current intensity of UA oxidation peak continuously decreases with increases of UA concentration. The response current intensity of DA and AA oxidation peak on both sides of UA gradually increases with the increase of DA and AA concentration. On the other hand, there is a significant difference in the oxidation potential difference between adjacent substances DA, UA, and AA (ΔE AA-UA = 141 mV, ΔE UA-DA = 167 mV, and ΔE AA-DA = 308 mV), which will play a decisive role in the simultaneous detection of DA, UA, and AA based on 2D Cu-TCPP MOFs/GCE electrochemical sensing platform. Therefore, the electrochemical platform based on 2D Cu-TCPP MOFs nanofilms is more conducive to the simultaneous detection of DA, UA, and AA with high selectivity, ultra-sensitivity, and ultra-distinguishability.
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ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Wenyu Bai,Chenglong Li,Feng Pan,Yu Luo,Tongtong Gao,Di Yu,Xiaorui Wang,Han Sun,Shuang Wang
The choice of electrode materials affects the electrochemical performance of supercapacitors, and the selection of suitable electrode materials is necessary to enable the industrialization of supercapacitors. The conductive polymer polypyrrole is well known to researchers for its excellent electrochemical properties, but pure polypyrrole does not fulfill its advantages. The disadvantage is that the microstructure of the polypyrrole molecules, which is favorable for energy storage when supercapacitors are being charged and discharged, is greatly damaged by the contraction/expansion of the polypyrrole molecular chains, which directly affects the electrochemical performance of the supercapacitors assembled subsequently. So firstly, we modified PPy by using the functional group nature of 3-amino-4-methylene-phenylboronic acid (g-PPy) to give it more active sites. Secondly, MXene acts as the backbone of g-PPy, which limits the expansion and contraction of the volume supercapacitors and improves cycle stability when charging and discharging. In contrast, the compounded MXene/g-PPy has good specific capacitance and stability after several thousand cycles, due to the nature of the functional group of 3-amino-4-methylenebenzeneboronic acid, a large number of g-PPy active sites, the good hydrophilicity of the MXene surface for interaction with sodium dodecylbenzene sulfonate and the hydrogen bonding between MXene and g-PPy, Even after 10000 charge/discharge cycles, its stability is significantly improved with a capacity retention rate of 98.6 %. In addition, the corresponding symmetrical supercapacitors were tested to exhibit significant cycling stability at a low temperature. This study, therefore, provides a method for the preparation of MXene based electrodes with high cycling stability by modifying the electrodes.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Peng Tang,Xueying Zhao,Jiawei Du,Mang Li,Haining Qian,Huiqi Ren,Xuyang Zhang,Guohua Wu,Xiangwei Wang
In this study, hollow Co@SiO 2 @PPy composites with excellent electromagnetic wave (EMW) absorption performance were successfully synthesized. The monodisperse hollow Co microspheres were prepared using a solvent-thermal method. The microspheres were then coated with an SiO 2 layer by a modified Stöber method. Finally, the SiO 2 layer was surface-coated by polypyrrole (PPy) through in-situ polymerization to obtain Co@SiO 2 @PPy composite materials with hollow core–shell structures. The prepared CSP2 composite achieved a minimum reflection loss (RL min ) of −65.83 dB at 1.86 mm, demonstrating an effective absorption bandwidth (EAB) of 4.84 GHz. The CSP3 composite achieved a widest EAB (EAB max ) of 5.4 GHz at a thickness of 1.83 mm, while simultaneously maintaining the RL level at −50.70 dB. Additionally, it demonstrated an RL min value of −61.66 dB with a thickness as thin as 1.66 mm. The observed shift of FTIR absorption peaks by 20 cm −1 in the PPy ring provides compelling evidence for the involvement of multilayered structures in polarization loss. The SiO 2 layer not only enhances the interface polarization but also prevents corrosion of the Co core by acidic solutions. The exceptional EMW absorption characteristics can be attributed to the effective impedance matching and the combined effect of magnetic and dielectric losses.
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POLYMER
·
2024
·
IF 4.1
Dongwei Xu,Mingju Zhang,Chao Wang,Zhihao Shen,Mengfei Wang,Jie Zhang,Ziang Han,Luyao Li,Xuhai Xiong,Ping Chen
Conductive polymers materials with hollow micro/nanostructure due to their special electrical properties and corrosion resistance have potential applications in microwave absorption, especially in marine environment. Herein, one-dimensional hollow conductive polypyrrole microtubes (H-PPyM) were prepared by in-situ polymerization of pyrrole monomer with methyl orange (MO) as soft template and FeCl 3 as oxidant based on structural regulation strategy. The morphology and conductivity of H-PPyM can be easily controlled by adjusting the content proportion of MO. The results indicated that the surface morphology of polypyrrole changed from random granular to microtubular and the conductivity also gradually rose with the content increase of MO. When the content proportion of MO was 0.25 g, the obtained H-PPyM-0.25 composites possed notable microwave absorption capacity, simultaneously achieving ultrabroad effective absorption bandwidth (EAB, 6.7 GHz) and strong reflection loss value (RL, −33.6 dB) at a thickness of 2.6 mm with the filling content of only 10 wt%, respectively. Furthermore, the corresponding H-PPyM-0.25 products soaked in corrosive medium (3.5 wt% NaCl solution) for one month still displayed stable tubular hollow structure and excellent microwave absorption performance with RLmin of −43.8 dB and EAB of 6.2 GHz. The research results can not only help to understand the relationship among the morphology and microwave absorption of PPy, but also open a new avenue for preparing excellent seawater corrosion resistant microwave absorption materials.
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