Materials Science & Engineering C-Materials for Biological Applications
·
2021
·
IF 7.328
Na Guo,Feng Cang,Zhen Wang,Ting-Ting Zhao,Xin-Rui Song,Stefano Farris,Yan-Yan Li,Yu-Jie Fu
Microbial contamination of water represents a great threat to the public health that has attracted worldwide attention. In this work, polypyrrole magnetic nanoparticles (Fe 3 O 4 @PPy NPs) with sterilization properties were fabricated. More specifically, the Fe 3 O 4 @PPy NPs obtained via aqueous dispersion polymerization and an in situ chemical oxidative polymerization exhibited a cationic surface and high photothermal conversion efficiency. More than 50% of bacteria adsorption can be achieved at a dosage of 100 μg/mL Fe 3 O 4 @PPy NPs under magnetic field, and high photothermal sterilization efficacy (~100%) can be obtained upon NIR exposure at the same dosage for 10 min. Noteworthy, the Fe 3 O 4 @PPy NPs can be recycled by magnetism and reused without affecting their photothermal sterilization capability. This study clearly provides experimental evidence of the great potential of Fe 3 O 4 @PPy NPs as stable and reusable nanocomposite materials for bacteria adsorption and photothermal sterilization performance. The application of Fe 3 O 4 @PPy NPs can realize enviromental-friendly bacterial contaminated water treatment as well as provide stratgies for synergistical antibacterial materials design.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Wei Yang,Chenyuan Weng,Xiaoyun Li,Hongliang He,Jianwen Fei,Wei Xu,Xiaoqiang Yan,Wanying Zhu,Hongsong Zhang,Xuemin Zhou
At present, artificial mimic enzyme has become a powerful substitute for natural enzyme. In particular, the biosensors based on nano-enzymes have been the focus of current research. Herein, a novel magnetic ternary nanocomposite hemin-Fe 3 O 4 @polypyrrole (h-Fe 3 O 4 @ppy) was synthesized by chemical oxidation polymerization. The results showed that the h-Fe 3 O 4 @ppy had stronger peroxidase activity than Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs) and h-ppy NPs, and was indicated by Michaelis-Menten constant (K m ) and maximum initial velocity (V max ). Therefore, we used h-Fe 3 O 4 @ppy catalyzing H 2 O 2 to oxidize the chromogenic substrate TMB, and built Hydrogen peroxide (H 2 O 2 ) and Glutathione (GSH) colorimetric biosensors with the help of signal intrinsic exponential amplification and easy operation. The controllable catalysis was realized by h-Fe 3 O 4 @ppy which was prone to separation. The method of removing h-Fe 3 O 4 @ppy by magnetic separation effectively eliminated the effect of residual catalysis when terminating the reaction. The sensor was then applied to the determination of GSH in biological samples from acute coronary syndrome patients. The linear ranges of H 2 O 2 and GSH were 0.2–100 μM and 0.5–80 μM, respectively. The detection limits of H 2 O 2 and GSH are 0.18 μM and 0.15 μM, respectively. This research not only proposes a new type of nanoenzyme, but also shows the multiple advantages of magnetic nano-enzymes for the construction of biosensors.
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JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 6
·3078-3083
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IF 1.938
Wu Wanyi,Wang Mengkun,Huang Huihui,Gu Wenxian,Yan Chengzhan,Chen Guang,Yin Dewu,Jin Huile,Wang Jichang,Wang Shun
In this work, hierarchically porous carbon spheres co-doped by iron and nitrogen were synthesized via in situ dehalogenation. The rich porous structure and relatively high specific surface area (210 m 2 /g) facilitate the formation of an ultra-fine Fe 2 N active phase and FeN 4 active centers within the carbon matrix. Transmission electron microscopy and X-ray photoelectron spectroscopy analysis further reveal the presence of a dominant Fe 2 N phase and minor FeN 4 bonds in the as-prepared Fe-N-C-pd-800 samples. Because of this, the oxygen reduction reaction (ORR) process can more readily take place on Fe 2 N than on FeN 4 , and the Fe 2 N phase enriched Fe-N-C-pd-800 carbon spheres exhibit a promising onset potential ( E onset =1.02 V) and half-wave potential ( E 1/2 =0.86 V) in alkaline media. In addition, Fe-N-C-pd-800 also shows excellent methanol resistance and long-cycling stability.
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Nano Energy
·
2021
·
IF 17.881
Yan Zheng,Tong Lin,Ning Zhao,Caixiu Huang,Wei Chen,Gi Xue,Yong Wang,Chao Teng,Xiaoliang Wang,Dongshan Zhou
Due to its unique advantages, capacitive electronic skin (E-skin) has shown excellent application potential in robotics, human-computer interaction, and biomedical equipment in recent years. However, the low sensitivity and nonlinear response caused by the classic working mechanism of compressing the microstructured elastic dielectric layer and the low dielectric constant of the elastomer limit practical applications of E-skin. To make the device respond linearly to pressure over a wide range, a new strategy of controlling the contact area between the elastic electrode and the dielectric layer is adopted. This design also reduces signal distortion, which originates from the viscoelasticity of the polymer. Furthermore, by using ferroelectric polymers and ionic gels with high capacitance in the dielectric layer, the sensitivity of the device can be adjusted in the range of 0.644–26.6 kPa −1 , and the lower limit of pressure detection is as low as 2.88 Pa. The performance of the device remains stable even after 8000 cycles of compression. On this basis, the successful application of the linear-response E-skin obtained in this work in physiological signal monitoring and the collection of basic object information, such as shape and hardness, proves the rationality of the design and provides the possibility for capacitive electronic skin to move towards real life applications.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Qiao He,Qingyun Wu,Xuxu Wang,Shuting Fu,Senchuan Huang,Shengfu Tong,Yangfei Cao,Zheng Liu,Mingmei Wu
Silicon is one of the most promising candidates for anode materials for next-generation lithium-ion batteries due to its high theoretical capacity. However, the catastrophic volume change upon lithiation/delithiation and the subsequent pulverization result in poor electrochemical performance and hinder its applications. To address this issue, a Si@N,S-doped carbon core–shell structure (Si@NSC) is proposed in this work. The composites are prepared by in situ polymerization and pyrolysis. The as-prepared Si@NSC electrode exhibits a stable capacity of 1720 mAh g–1 at 0.3 A g–1 after 550 cycles with a capacity retention of 90.2%. Compared with commercial silicon and a mixture of Si and C, Si@NSC demonstrates high initial efficiency and superior cyclic stability owing to its unique structure and moderate Si/C ratio. The Si@NSC composites shed light on the application of Si-based anode materials for high-capacity lithium storage.
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ACS Omega
·
2021
·
IF 3.512
Xueqin Zhang,Le Huang,Yan Qing,Zhifei Gao,Yiqiang Wu,Shaoheng Hu,Liaoyuan Xia
Highly conductive and elastic three-dimensional (3D) porous carbon materials are ideal platforms to fabricate electrodes for high-performance compressible supercapacitors. Herein, a robust, highly conductive, and elastic carbon foam (CF) hybrid material is reported, which is fabricated by integrating cellulose nanofiber/multiwalled carbon nanotube (CNF/MWCNT) aerogel sheets with a melamine sponge (MS), followed by carbonization. The carbonized CNF/MWCNT aerogel sheets contribute to the high conductivity and specific surface area of the CF, and the 3D network-like skeleton derived from the carbonization of the MS enhances the elasticity and stability of the CF. More importantly, the CF possesses good scalability, allowing the introduction of electroactive materials such as polypyrrole (PPy) and Fe3O4 to fabricate high-performance compressible PPy–CF and Fe3O4–CF electrodes. Moreover, an assembled PPy–CF//Fe3O4–CF device shows reversible charging–discharging at a voltage of 1.6 V and demonstrates a high specific capacitance (172.5 F/g) and an outstanding energy density (59.9 W h/kg). The device exhibits capacitance retention rates reaching 98.3% and stable energy storage characteristics even under different degrees of compressive deformation. This study offers a scalable strategy for fabricating high-performance compressible supercapacitors, thereby providing a new means of satisfying the energy storage needs of portable electronic devices that are prone to deformation.
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Food & Function
·
2021
·Vol. 12
·期 14
·6334-6347
·
IF 5.396
Bei Li,Xiaodong Wang,Shasha Hong,Qi Wang,Lin Li,Omer Eltayeb,Chuan Dong,Shaomin Shuang
Herein, PPy@MnO2 nanocomposites were first harvested by anchoring MnO2 nanosheets on polypyrrole (PPy) nanoparticles via an in situ redox reaction, then polyethylene glycol (PEG) modifier and methylene blue (MB) photosensitizer were linked through electrostatic interactions to obtain PPy@MnO2-PEG-MB nanoarchitectures. PPy nanoparticles ensure photothermal therapy (PTT) ability and MnO2 nanosheets ameliorate tumor hypoxia for enhanced photodynamic therapy (PDT). Therefore, a multifunctional nanotherapeutic system was constructed for the combined PTT/PDT of tumors. For extracellular photothermal properties, the optimal temperature elevation was 52.6 °C with 54.4% photothermal conversion efficiency. The extracellular PDT ability was measured by detecting 1O2 generation; more 1O2 was produced under acidic conditions in the presence of H2O2 (a simulated tumor microenvironment). The effective cellular uptake of the nanotherapeutic system in HeLa cells was observed by confocal laser scanning microscopy (CLSM). CLSM also indicated that more 1O2 was generated by the nanotherapeutic system as compared to free MB in HeLa cells, confirming the amelioration of tumor hypoxia by MnO2 nanosheets. MTT assays demonstrated that the nanotherapeutic system possessed superior biocompatibility without laser irradiation, and the lowest cell viabilities for single PTT and PDT groups were 13.78%, 38.82% respectively, while there was only 1.29% cell viability in the combined PTT and PDT group. These results suggest that the strategy of assembling PPy with MnO2 for a multifunctional PTT and enhanced PDT nanoplatform was realized, and opens up an unimpeded approach for integrating photothermal reduction materials with MnO2 for use in synergistic PTT and PDT.
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高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 5
·1-10
·
IF 5.833
Wang Dongwei,Wang Jiasheng
The potential of functionalized polypyrrole nanowires (PPyNWs) are demonstrated as a platform for lable-free miRNA detection using electrochemical impedance spectroscopy (EIS). MicroRNAs (miRNAs) detection methods and sensors are mainly challenged by very low concentrations in physiological samples and high similarity among family members. Herein, a sensitive and selective miRNA biosensor was constructed based on electrochemically synthesized PPyNWs, which were functionalized with polyamidoamine dendrimer (PAMAM) by an electro-oxidation method. The prepared PPyNWs/PAMAM hybrid combines the excellent electrical conductivity of conducting polymer PPyNWs with high surface to volume ratio of PAMAM. DNA probes were immobilized onto the PPyNWs/PAMAM hybrid for the construction of the miRNA biosensor. Using the sensitive EIS technique to monitor DNA/miRNA hybridization, the developed biosensor demonstrated excellent sensing performances, such as wide linear range (10 −14 M-10 −8 M) and low detection limit (0.34 × 10 −14 M). Even more encouraging, the response sensitivity of the biosensor was 3.12 times higher than that of the bulk PPy-modified sensor, which proved that the microstructure of the PPy nanowires array can greatly improve the performance of the biosensor. Graphical abstract
An ultrasensitive and selective miRNA biosensor was constructed based on electrochemically synthesized polypyrrole nanowires array (PPyNWs), which were functionalized with polyamidoamine dendrimer (PAMAM) by an electro-oxidation method.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xiao Pang,Xiaohong Yu,Yubin He,Sen Dong,Xueting Zhao,Jiefeng Pan,Runnan Zhang,Lifen Liu
Cationic separating the with different valence states is greatly desirable but technically challenging. Achieving such a precise separation using membranes requires accurately distinguishing tiny differences of cations on physico-chemical properties. Here, inspired by the ion dehydration effect, a series of cation exchange membrane with adjustable surface hydrophobicity based on quaternized polypyrrole were prepared. We demonstrate that improving hydrophobicity of modified layer substantially hinder cations with higher hydration energy to enter the modified layer due to their stronger binding ability with water molecules. When applied in electro-driven cation separation, the optimal membrane exhibited an outstanding perm-selectivity between monovalent and divalent cations (P Na Mg = 12.95, P Li Mg = 1.28) than commercial monovalent cation perm-selective membrane (P Na Mg = 2.46, P Li Mg = 1.07). Overall, our results indicate that the hydrophobicity of the modified layer governs the cations dehydration behavior through the polymeric pores due to ion-pore wall interactions, providing the scientific basis for the construction of membranes with high monovalent cation perm-selectivity.
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POLYMER DEGRADATION AND STABILITY
·
2021
·
IF 5.03
Kai Qi,Zhenzhen Jin,Dan Wang,Zhenyu Chen,Xingpeng Guo,Yubing Qiu
The irreversible electroactivity degradation is a key and broad issue for conducting polypyrrole (PPy). PPy degradation involves chemical and electrochemical processes affected by various factors, including doping anions, electrolyte pH, dissolved oxygen (DO), temperature ( T ), electrode potential, etc. This study probes into the effect of T on electroactivity degradation of PPy in 0.5 M NaOH. Increasing the T (25~80 o C), the degradation kinetics of PPy remains the same first-order relationship, while the degradation rate constant is significantly affected, which shows a maximum value in 50 o C deaerated or 70 o C aerated NaOH, respectively. In deaerated NaOH, the open circuit potential of PPy becomes very negative to reach a reduction state with increasing T , which may restrain penetration of OH - ions into PPy film to inhibit the degradation in its interior. In aerated NaOH, the concentration of DO lowers with increasing T to suppresses the electrochemical process in PPy degradation and decrease its degradation. DO still plays a crucial role in the PPy degradation process at high T . A thorough understanding of the effect of electrolyte T on electroactivity degradation of PPy would offer valuable concepts for in-depth and comprehensive insights into the mechanisms and kinetics of PPy degradation.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
En Li,Yamin Pan,Chunfeng Wang,Chuntai Liu,Changyu Shen,Caofeng Pan,Xianhu Liu
Cellulose-based materials have attracted tremendous interest recently due to their fascinating merits of renewability, biodegradability, and low cost, holding great promise in electromagnetic protection, clean energy harvesting, and thermal management. However, the simple and effective integration of multiple functions into single cellulose material remains a challenge. Herein, we report the fabrication of a multifunctional and superhydrophobic cellulose composite paper (CCP) via coated MXene modified by in-situ polymerized polypyrrole and PDMS/candle soot on the opposite surface of the paper. CCP exhibits high-performance electromagnetic interference shielding effectiveness (~40 dB) while maintaining high electrical conductivity (1467 S/m). Moreover, the superhydrophobic surface of CCP can be used as the hydraulic triboelectric nanogenerator (H-TENG) to harvest water energy due to the liquid–solid contact triboelectrification and electrostatic induction. The hydraulic triboelectric energy can be captured and released when water droplets drop from a height of 2 cm and roll at a tilt angle of 20°, the output current can reach a peak of 0.8 nA. Furthermore, the surface saturation temperature of CCP can reach 140 °C with a low applied voltage of 6 V enabled by the Joule effect. Thus, CCP holds great potentials in applications of integrated smart electronics, clean energy harvesting, and thermal management.
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Nano Energy
·
2021
·
IF 17.881
Jintao Zhang,Sanming Hu,Zhijun Shi,Yifei Wang,Yanqiang Lei,Jing Han,Yao Xiong,Jia Sun,Li Zheng,Qijun Sun,Guang Yang,Zhong Lin Wang
Environment issues calls for eco-friendly, recyclable, and biodegradable natural materials for the extensive application of distributed energy harvesting triboelectric nanogenerators (TENGs) and wearable self-powered interfaces. Biocompatible bacterial cellulose (BC) with high crystallinity , good mechanical properties and distinctive porous network is ready to construct biodegradable and eco-friendly TENGs. Here, we develop an eco-friendly and recyclable all-cellulose energy-harvesting and interactive device based on sandwich-structured BC-TENG. It is composed of pure BC and conductive BC precipitated with conducting and reinforced nanomaterials as friction layers and electrodes, respectively. Degradation experiments are conducted in this work to demonstrate the active materials can be completely degraded within 8 h under the condition of cellulolytic enzyme . We have also carefully investigated the output performances of the prepared all-cellulose TENG, which shows a maximum open-circuit voltage of 29 V, short-circuit current of 0.6 μA, and output power at 3 μW. The all-cellulose TENG is readily utilized to power commercial electronics and functionalize as a wearable sewing interface to control an electronic piano. This work provides an efficient route to preparing all-cellulose energy-harvesting and interactive device with good biodegradability, which is of great importance in eco-friendly electronics, bio-adaptive human-machine interfaces and intelligent biomimetic functional devices.
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