MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Yujue Feng,Hongyuan Guo,Guojuan Zhang,Yingchun Zhu,Suozhu Wu
A molecularly imprinted polymer/reduced graphene oxide (MIP/RGO)-based electrochemical sensor was developed for determining vanillin (VAN). The sensing element of MIP/RGO modified electrode was fabricated by successive in-situ electrodeposition of RGO and molecularly imprinted polypyrrole nanowires on a bare glassy carbon electrode surface. The RGO was utilized for signal amplification and the molecularly imprinted polypyrrole nanowires was used for specific recognition of VAN. VAN was detected by square-wave voltammetry using the redox probe of potassium ferricyanide. Under the optimized conditions, the MIP/RGO-based electrochemical sensor exhibited an ultra-wide linear response range of 10 pM to 100 μM and ultra-low limit of detection of 5.4 pM for VAN with the advantages of simplicity, good reproducibility, high stability and excellent selectivity. The proposed electrochemical sensor could also be employed to monitor picomole quantities of VAN in infant formula samples with good recoveries.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Huihuang Shen,Junjun Wang,Huabo Huang,Jiayou Ji,Liang Li
The absorption of microwaves is significantly influenced by the structure of the absorber. Typically, the electromagnetic parameters can be adjusted by modifying the structure of the absorber. In this work, a novel approach is proposed to enhance microwave absorption properties by adjusting the impedance matching of MXene nanosheets. MXene/PPy hybrids with loose lamellar structure are synthesized through self-assembly of positively charged polypyrrole (PPy) and MXene nanosheets with negative charges, facilitated by electrostatic and hydrogen-bonding interactions. The impact of polymorphic PPy on the electromagnetic parameters and microwave absorption properties of MXene nanosheets is comprehensively explored. It is found that the addition of PPy with different morphologies can effectively tune the electromagnetic parameters of the MXene nanosheets. Particularly, the microwave absorption capabilities are significantly enhanced when PPy nanopaperclips are uniformly adsorbed on the surface of the MXene nanosheets. This enhancement is attributed to the favorable impedance match between PPy nanopaperclips and MXene nanosheets along with the exceptional attenuation capabilities of PPy. A minimum reflection loss (RLmin) of −47.85 dB is achieved at an ultrathin matched thickness of 1.6 mm, and the maximum effective absorption bandwidth (EABmax) is 5.01 GHz at 1.9 mm for the prepared MXene/PPy nanopaperclip hybrid with a filling rate of 20%. Furthermore, a bandwidth with 99% absorption efficiency of 15.4 GHz (2.4–18.0 GHz) can be attained when the thickness of the absorber ranges from 1.6 to 10.0 mm. It is anticipated that this work will provide valuable insights for the manufacture of high-performance microwave absorbers.
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Applied Materials Today
·
2024
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IF 7.2
Xiaolong Cao,Kai Yan,Hua Chen,Qunna Xu,Yan Zong,Xiaodan Sun,Xiao Li
Smart fabrics show a huge advantage in the field of flexible wearable electronics because of their superior hygienic properties. Here, a flexible wearable fabric for underwater sensing with both electromagnetic wave absorption (EWA) and passive radiation heating properties is fabricated by integrating polypyrrole (PPy), ferroferric oxide (Fe 3 O 4 ) nanospheres, and hydrophobic polyurethane (PDMS-PUF) onto the surface of the fabric. The multi-layer integrated structure allows the fabric sensor to be superhydrophobic (water contact angle is 154.5°) without much impact on its air permeability. At the same time, the conductive PPy network confers the fabric sensors with a rapid response rate (245/327 ms), effectively enabling long-term monitoring, especially during underwater sports in which the real-time altitude of the wearer can be monitored. Moreover, owing to the strong near-infrared absorption and ideal photothermal conversion performance of PPy, the fabric sensor achieves the maximum solar absorption rate (95.1 %) in the visible light region, and shows favorable radiative heating characteristics (10 min temperature rise of 23.5°C). Remarkably, the fabric is endowed with multiple loss mechanisms on the presence of PPy and Fe 3 O 4 , achieving prominent EWA properties (-29.1 dB at 12.16 GHz). Therefore, the smart fabric is an ideal candidate for smart swimsuits and health protection.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 3
·1-13
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IF 2.8
Liang Caiying,Lan Pei,Feng Shuhuan,Xu Tengfei,Dong Liubing,Zhao Jianhao,Rong Jianhua
Integrated hydrogel supercapacitors have attracted increasing attention owing to their low interfacial contact resistance and excellent electrochemical performance even under folding and bending. Herein, phosphomolybdic acid-doped polypyrrole (PPy) was deposited in situ on the surface of a hydroxypropyl cellulose/polyvinyl alcohol (HPC/PVA) hydrogel to fabricate integrated hydrogel supercapacitors. The negatively charged phosphomolybdic acid (PMo 12 ) was anchored onto the positively charged PPy chain to prevent its dissolution in the electrolyte thereby enhancing its pseudocapacitive performance. PMo 12 also can dope and modify PPy, providing additional pseudocapacitance and thereby improving the energy storage capacity of the supercapacitor. The supercapacitor achieved a high areal specific capacitance (350 mF cm −2 at 0.5 mA cm −2 ) and demonstrated a remarkable energy density (24.0 \(\upmu\) Wh cm −2 at 1000 \(\upmu\) W cm −2 ). After 1000 galvanostatic charge–discharge cycles at a high current density of 10 mA cm −2 , it retained 71.3% of its initial capacitance and maintained 98% Coulombic efficiency.
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Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Yuhang Yu,Chao Liang,Youquan Li,Zijun Zhang,Weiming Wang,Jun Xiong,Ming Li
Interfacial solar-driven desalination (ISDD) offers a promising solution to global freshwater shortages. Challenges such as complex manufacturing, high costs, low evaporation rates, and poor salt resistance have hindered its adoption. This study introduces a spherical solar evaporator, PPy-PFS, created by coating polyester fibre spheres (PFS) with polypyrrole (PPy) via solution immersion. The black PPy-PFS achieves an evaporation rate of 2.10 kg m –2 h –1 under 1 sun. With strong water supply and storage, it maintains a stable rate of 1.61 kg m –2 h –1 in 25 wt% saltwater. Long-term indoor tests (30 days, 8 h per day) show PPy-PFS's durability in desalinating 20 wt% saltwater. Producing 1 m 2 of PPy-PFS costs about 25.97 $, with a cost-effectiveness of 80.86 g h –1 USD –1 . Outdoor tests reveal that 1 m 2 of PPy-PFS can produce around 10 kg of freshwater daily from 20 wt% saltwater. Continuous evaporation of highly concentrated saltwater results in salt crystallization, achieving zero liquid discharge (ZLD). This simply designed, cost-effective, efficient, and salt-resistant PPy-PFS evaporator provides a potential strategy for mitigating freshwater shortages.
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CHEMOSPHERE
·
2024
·
IF 8.1
Shuzhao Zhang,Wenwen Bie,Xiongcheng Duan,Zhuorui Wu,Lin Zhang,Hengye Li,Zhongxia Wang,Meijie Wei,Fenying Kong,Wei Wang
Herein, effort was made to construct innovative adsorbent for the removal of polar organic micropollutants (OMPs) from water. Tetra- meso resorcinol-functionalized calix[4]pyrrole (CP) featured with endo -functionalized attribute and polyphenol hydroxyl structure was crosslinked by π-electron-rich 4,4′-bis(chloromethyl)biphenyl (BCMBP) through Friedel-Crafts reaction to generate porous calix[4]pyrrole-based polymers (PCPPs) with high surface area. The porosity of the PCPPs could be tuned by adjusting the molar ratio of hydrophilic CP to hydrophobic BCMBP, and diversified binding sites were integrated together. Based on adsorption kinetics and isotherm studies, PCPP(1–16) showed rapid adsorption rate and high removal efficiency (RE) as well as advanced adsorption capacity. The REs towards the tested polar OMPs by PCPP(1–16) were all above 95% in 30 min. Compared with granular activated carbon (GAC), the rate constant of pseudo-second-order model ( k 2 ) and adsorption capacity upon PCPP(1–16) were 8–230 times and 1.3–3.1 times greater than those by GAC. Adsorption mechanism studies confirmed the presence of multiple interactions and thermodynamic investigation revealed the spontaneous and physical adsorption nature. Besides, PCPP(1–16) showed excellent adsorption performance in real water samples at environmental levels and exhibited advanced absorption ability in flow-through mode. Accompanied by facile regeneration under eluting with methanol and cost-effective preparation, PCPP(1–16) demonstrated great potential as promising adsorbent for water treatment.
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Photodiagnosis and Photodynamic Therapy
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2024
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IF 3.1
Pinggui Chen,Yaoxuan Li,Yunyan Dai,Zhiming Wang,Yunpeng Zhou,Yi Wang,Gaopeng Li
Photodynamic therapy (PDT) is a non-invasive treatment method that has garnered significant attention in recent years. Nanoparticle-based drug delivery systems can achieve targeted drug release, thereby significantly reducing side effects and enhancing therapeutic efficacy. In this study, a covalent organic framework (COF) with an approximately spherical structure connected by azo bonds was synthesized. The synthesized COF was utilized as a hypoxia-responsive carrier for doxorubicin (DOX) drug delivery and was modified with hyaluronic acid (HA). DOX@COF@HA exhibited a reactive release under hypoxic conditions. Under normal oxygen conditions, the release of DOX was 16.9 %, increasing to 60.2 % with the addition of sodium hydrosulfite. In vitro experiments revealed that the group combining photodynamic therapy with chemotherapy exhibited the lowest survival rates for 4T1 and MHCC97-L cells. In vivo experiments further validated the effectiveness of combination therapy, resulting in a tumor volume of only 33 mm 3 after treatment, with no significant change in mouse weight during the treatment period. DOX@COF@HA nanoplatforms exhibit substantial potential in tumor treatment.
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ANALYTICAL CHEMISTRY
·
2024
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IF 6.7
Yanan Li,Hao Zhao,Guanghong Han,Ze Li,Samuel M. Mugo,Hongda Wang,Qiang Zhang
Dental caries is one of the most common diseases affecting more than 2 billion people’s health worldwide. In a clinical setting, it is challenging to predict and proactively guard against dental cavities prior to receiving a confirmed diagnosis. Streptococcus mutans (S. mutans) in saliva has been recognized as the main causative bacterial agent that causes dental caries. High sensitivity, good selectivity, and a wide detection range are incredibly important factors to affect S. mutans detection in practical applications. In this study, we present a portable saliva biosensor designed for the early detection of S. mutans with the potential to predict the occurrence of dental cavities. The biosensor was fabricated using a S. mutans-specific DNA aptamer and S. mutans-imprinted polymers. Methylene blue was utilized as a redox probe in the sensor to generate current signals for analysis. When S. mutans enters complementarily S. mutans cavities, it blocks electron transfer between methylene blue and the electrode, resulting in decreases in the reduction current signal. The signal variations are associated with S. mutans concentrations that are useful for quantitative analysis. The linear detection range of S. mutans is 102–109 cfu mL–1, which covers the critical concentration of high caries risk. The biosensor exhibited excellent selectivity toward S. mutans in the presence of other common oral bacteria. The biosensor’s wide detection range, excellent selectivity, and low limit of detection (2.6 cfu mL–1) are attributed to the synergistic effect of aptamer and S. mutans-imprinted polymers. The sensor demonstrates the potential to prevent dental caries.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2025
·Vol. 172
·期 3
·036504
·
IF 3.3
Ke Qu,Qianlan Li,Chao Liang,Jia Wei
In typical solid-contact potentiometric sensing, ion selective membranes (ISMs) play the role of recognizing the target analytes. A variety of solid-contact materials have been utilized to realize the ion-to-electron transduction. However, the ISMs show some drawbacks during practical application. Recent research efforts have been devoted to developing ISM-free potentiometric sensing. In this work, an ion-imprinted conducting poly (pyrrole-co-pyrrole-3-carboxylic acid) copolymer was investigated to achieve the ISM-free potentiometric sensing toward nitrate, an important anion to monitor in the environment. The copolymer-based electrochemical sensor afforded good potentiometric responses toward nitrate in a Nernstian manner, exhibiting superior or comparable sensing performances with existing ISM-based potentiometric sensors. Compared with polypyrrole homopolymer, the introduced carboxylate group in the side chain of the copolymer was likely to contribute to the redox activity, enabling better ion-to-electron transduction. More importantly, a unique self-doped effect was observed in the prepared poly (pyrrole-co-pyrrole-3-carboxylic acid), extending the working pH range of polypyrrole family and providing potential implications to develop electrochemical sensors when the environmental pH matters.
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Journal of Materials Chemistry C
·
2024
·
IF 5.7
Zhongwen Luo,Wenchao Ye,Feng Long,Wenlang Liang,Yongxiang Leng
Flexible, biocompatible, and high-performance energy storage platforms that can intimately interface with biological systems are highly desirable for emerging on-skin sensing and wearable electronic devices. In this work, we report the development of a novel poly(pyrrole/dodecylthiophene/acrylamide) (PPDA) hybrid conductive material with a distinctive hierarchical porous structure. The PPDA hybrid integrates a self-assembled polypyrrole (PPy) and polydodecylthiophene/γ-CD (PDDT/γ-CD) nanotubular aerogel network within a biocompatible polyacrylamide (PAAm) hydrogel matrix. This unique nanoarchitecture, achieved through a templated method utilizing LCA-(DDT/γ-CD) nanotube solution as templates to form PPy/PDDT/γ-CD nanotubular network structures, endows the PPDA hybrid with exceptional properties. These include flexibility, biocompatibility, and enhanced electrical conductivity up to 1.6 S m−1, outperforming conventional PPy aerogels. As a supercapacitor electrode material, the PPDA hybrid exhibits good electrochemical performance, with a specific capacitance of 149.6 F g−1 at 1 A g−1 current density and retaining 82.3% of its capacitance after 1000 cycles at 5 A g−1. The hierarchical porous structure, combining the advantages of nanotubes and hydrogels, facilitates multidimensional electron transport, rapid electrolyte diffusion, and robust mechanical properties. Consequently, the PPDA hybrid maintains stable electrochemical performance even under various mechanical deformations, including folding at angles up to 135° and stretching up to 50% strain. In vitro biocompatibility studies further confirm the PPDA hybrid's suitability for biological interfaces. The multifunctional PPDA hybrid combines flexibility, high electrical conductivity, good electrochemical properties, and biocompatibility, making it a promising platform for a range of applications, particularly in flexible supercapacitor and strain sensing applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Shubin Li,Yanhao Liu,Lili Fan,Jiang Zhu,Lu Wang
Peripheral nerve injury is a serious medical condition, but the limited availability of autologous grafts often delays timely treatment for many patients. The implantation of functional hydrogels with good biocompatibility provides an effective solution to this challenge. In this study, a novel chitosan derivative, choline functionalized catechol carboxymethyl chitosan (CF-Catechol-CMCS), was synthesized by modifying carboxymethyl chitosan (CMCS) with choline functionalized (CF) molecule and catechol. CF-Catechol-CMCS, sodium alginate (SA), and pyrrole monomer (Py) were then combined, crosslinked with Fe 3+ and Ca 2+ , and polymerized in situ to form polypyrrole (PPy), resulting in the CF-Catechol-CMCS/SA/PPy hydrogel. This hydrogel exhibits excellent thermal stability, with a maximum thermal degradation temperature of 580 °C. By adjusting the ratio of PPy to CF-Catechol-CMCS/SA in the hydrogel, its degradation properties, swelling behavior, mechanical properties, and electrical conductivity can be fine-tuned. Specifically, when the mass ratio of PPy to CF-Catechol-CMCS/SA is 8:10, the hydrogel achieves optimal conductivity within a safe range (1.82 × 10 −3 S·cm −1 ). By controlling the mass ratio of CF-Catechol-CMCS to SA in the hydrogel, the acetylcholine concentration can be regulated. When the CF-Catechol-CMCS:SA ratio is 2:1, the measured Sciatic Function Index (SFI) value is −34.54, indicating that the CF-Catechol-CMCS/SA/PPy hydrogel has excellent nerve repair potential.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yuchen Zhou,Zezhi Chen,Huijuan Gong,Xiaoshu Wang,Lu Chen,Huiqiang Yu
Zinc porphyrins, boasting a coordination environment akin to that of natural carbonic anhydrase (CA), coupled with excellent structural stability, built-in hydrophobic pocket, and suitable charge of center Zn 2+ , were considered as potential CA-mimics for CO 2 capture. To validate this assumption, three zinc porphyrin representatives, zinc porphin (ZnP), zinc protoporphyrin IX (ZnPP), and zinc meso -tetrakis(N-methylpyridinium-4-yl) porphyrin (ZnTMPyP), were prepared, and tested performance in enhancing CO 2 absorption in water and K 2 CO 3 solutions. The results from CO 2 absorption experiments indicated that ZnTMPyP with the optimal dosage increased CO 2 absorption rate by 44.25 % in water, and ZnPP with the optimal dosage increased the CO 2 absorption rate by 63.67 % in 20 wt% of K 2 CO 3 solution, which are respectively 1.53 and 2.07 times of CO 2 absorption performance of zinc cyclen (ZnC), the most effective CA-mimic reported. Besides, the zinc porphyrins demonstrated excellent stability and reusability throughout five cycles of CO 2 absorption and desorption, which are vital aspects for practical applications. Through the calorimetric method and density functional theory (DFT) calculations, it was confirmed that the prepared zinc porphyrins had similar enzymatic behavior and catalytic CO 2 hydration pathway to natural CA. According to the results of characterization and DFT calculations, high dispersion, the lowest charge of the Zn 2+ center, and the existence of additional CO 2 adsorption sites (propionate ions), endow ZnPP with the highest catalytic activity in the K 2 CO 3 solution.
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