PROGRESS IN ORGANIC COATINGS
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2023
·
IF 6.6
Wei Luo,Kai Qi,Yubing Qiu,Xingpeng Guo
A polypyrrole/zinc (PPy/Zn) bilayer coating is prepared to significantly improve the corrosion resistance of ZK60 magnesium alloy in 37 °C Hank's solution to meet the requirements for biodegradable metals. The zinc coating composed of dense and uniform flake-like zinc crystals displays good abrasion resistance and adhesion strength , acting as a vital intermediate layer for growing the PPy film doping with tartrate anions (TA − ). The prepared PPy/TA films (10, 20 and 28 μm) on the Zn coating are compact and have high stability in Hank's solution. The electrochemical and hydrogen evolution tests for PPy/Zn/ZK60 specimens show that the PPy/TA film's stability determines the protective performance of PPy/Zn coating in a long immersion period. The PPy(20 μm)/Zn coating has the longest protection time (40 ± 4 days), and too thick PPy film (28 μm) damages its structure to accelerate breakage, developing local corrosion quickly on ZK60. The corrosion mechanism involved is discussed.
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Nanomaterials
·
2023
·Vol. 13
·期 5
·865
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IF 5.3
Yinbo Wu,Yaowei Feng,Xiulian Qiu,Fengming Ren,Jian Cen,Qingdian Chong,Ye Tian,Wei Yang
Lithium-sulfur batteries with high theoretical energy density and cheap cost can meet people’s need for efficient energy storage, and have become a focus of the research on lithium-ion batteries. However, owing to their poor conductivity and “shuttle effect”, lithium-sulfur batteries are difficult to commercialize. In order to solve this problem, herein a polyhedral hollow structure of cobalt selenide (CoSe2) was synthesized by a simple one-step carbonization and selenization method using metal-organic bone MOFs (ZIF-67) as template and precursor. CoSe2is coated with conductive polymer polypyrrole (PPy) to settle the matter of poor electroconductibility of the composite and limit the outflow of polysulfide compounds. The prepared CoSe2@PPy-S composite cathode shows reversible capacities of 341 mAh g−1at 3 C, and good cycle stability with a small capacity attenuation rate of 0.072% per cycle. The structure of CoSe2can have certain adsorption and conversion effects on polysulfide compounds, increase the conductivity after coating PPy, and further enhance the electrochemical property of lithium-sulfur cathode material.Keywords:lithium-sulfur battery;transition metal selenides;metal-organic framework;polypyrrole;sulfur host
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Huaiyu Li,Jia Luo,Danyang Han,An Liu,Miao Zhou,Junlin Huang,Yucan Zhu,Zhaohui Hou,Hong Yin
Zinc sulfide (ZnS) anode has gripped much focus in face of the various candidates for sodium-ion batteries (SIBs) because of its high capacity, abundant resource as well as environmental friendliness. Nevertheless, the structural collapse of ZnS and the dissolution of polysulfides will irreversibly lead to inferior Na-storage properties. Herein, layer-by-layer hetero-carbon modifying ZnS nanocubes anode (ZnS@NDC) composite has been rationally designed and prepared using pre-carbonized ZIF-8 as a matrix framework, C 3 N 4 and polypyrrole as the coated carbon sources. The initial carbon layer derived from C 3 N 4 can change the surface properties of ZnS nanocubes improving the electronic affinities and provide sufficient buffer matrix successfully inhibiting the agglomeration of ZnS nanocubes. The second carbon layer derived from polypyrrole can improve the ionic diffusion and electronic conductivity owing to the high conductivity and strong charge storage capacity of polypyrrole, as well as further accommodate volume expansion of the ZnS nanocubes. Synergistic effects of layer-by-layer hetero-carbon modifying can also refrain from dissolution of polysulfides improving the structural stability and electrochemical kinetics. When denoted as the anode for SIBs, ZnS@NDC electrode displays admirable long-term life stability and rate capability with capacities of 518.6 mA h g −1 at 1.5 A g −1 after 1000 cycles and 192.4 mA h g −1 at 10 A g −1 , respectively. The idea of synthetic ZnS@NDC material supply experimental basis for the farther development of Na-storage devices and provide an innovative way for the synthesis of other metal compounds based on layer-by-layer construction.
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Nanoscale
·
2023
·Vol. 15
·期 18
·8424-8431
·
IF 6.7
Bingfang Zou,Shiyun Lou,Jie Duan,Shaomin Zhou,Yongqiang Wang
Magnetic-based microfluidic SERS biosensors hold great potential in various biological analyses due to their integrated advantages including easy manipulation, miniaturization and ultrasensitivity. However, it remains challenging to collect reliable SERS nanoprobe signals for quantitative analysis due to the irregular aggregation of magnetic carriers in a microfluidic chamber. Here, magnetic/plasmonic hybrid nanostirrers embedded with a Raman reporter are developed as capture carriers to improve the reliability of microfluidic SERS biosensors. Experimental results revealed that SERS signals from magnetic hybrid nanostirrers could serve as microenvironment beacons of their irregular aggregation, and a signal filtering method was proposed through exploring the relationship between the intensity range of beacons and the signal reproducibility of SERS nanoprobes using interleukin 6 as a model target analyte. Using the signal filtering method, reliable SERS nanoprobe signals with high reproducibility could be picked out from similar microenvironments according to their beacon intensity, and then the influence of irregular aggregation of magnetic carriers on the SERS nanoprobe could be eliminated. The filtered SERS nanoprobe signals also exhibited excellent repeatability from independent tests, which lay a solid foundation for a reliable working curve and subsequent accurate bioassay. This study provides a simple but promising route for reliable microfluidic SERS biosensors, which will further promote their practical application in biological analysis.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Donglai Peng,Shaofan Duan,Xiaoquan Feng,Zongkai Liu,Jing Wang,Dongyang Li,Yatao Zhang
The membrane-based technology for propylene/propane (C 3 H 6 /C 3 H 8 ) separation is very promising due to its low-energy separation process with high effectiveness. Herein, we propose a new type of mixed-matrix membranes (MMMs) containing zero-dimension non-porous porphyrin-based complex (M-TMCPP, M = Zn 2+ , Cd 2+ , Ni 2+ ) with coordinatively unsaturated metal sites. Density functional theory calculation results show that M-TMCPP can form π complexation with C 3 H 6 and facilitate C 3 H 6 molecule through membranes. Different from porous nanofillers, M-TMCPP exhibits zero-dimension non-porous molecular structure and can be dissolved in solvent at molecular lever under low concentration. Benefiting from the favorable interaction between C 3 H 6 with metal sites and the uniform distribution of M-TMCPP particles and/or even independent M-TMCPP molecules in polymer, the porphyrin-based complexes are used as nanofillers in fluorinated polyimide (6FDA-DAM). The prepared MMMs exhibit an extraordinary C 3 H 6 /C 3 H 8 ideal selectivity of up to 45.6 with a high C 3 H 6 permeability of 70.3 Barrer, far surpassing the previously reported 6FDA-based polyimide MMMs and polymeric membranes. Membrane performances of three different M-TMCPP MMM were studied and the gas transportation mechanism was evaluated. This work provides a new conceptual approach of using non-porous zero-dimensional complexes with coordinatively unsaturated sites as fillers in mixed matrix membranes, which not only can accomplish olefin/alkane separation with ultrahigh performance, but also indicates its high potential for feasible usage.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Jianan Wang,Xin Chen,Zhenyu Wang,Changzheng Lin,Shiyi Sun,Jianwei Liu,Yunpeng Liu,Qianyue Ma,Ling Wang,Kai Yang,Jiangtao Feng,Xi Wang,Qiong Cai,Wei Yan
Practical operation of lithium-sulfur (Li-S) batteries with high sulfur loading and efficient/stable sulfur conversion requires the suppression of the lithium polysulfides (LiPSs) shuttling and the facilitation of ion and electron transfer on the electrode material surface. Herein, a multifunctional current collector, composed of Ag@polypyrrole (PPy) coated electrospun carbon nanofibers (CNF) framework, was rationally designed to construct a highly efficient catalytic/absorptive/conductive network to improve the performance of Li-S batteries under practical operation condition. At the molecular scale, the Ag@PPy molecular not only effectively inhibits LiPSs shuttle effect, but also achieves the fast sulfur catalysis and depolarization during charge transfer due to the high conductivity of Ag nanoparticles. At the electrode scale, the three-dimensional (3D) robust fibrous nanostructure provides abundant physical space to realize high sulfur loading, maintains electrode integrity during large volume change of active sulfur and under mechanical abuse condition, as well as enables the high-flux Li + diffusion and electrolyte flow. Consequently, Li-S batteries with the CNF/Ag@PPy current collector delivered excellent cycling stability (capacity fading of 0.048% per cycle over 500cycles at 1.0C) and high energy density (234.2 Wh kg cell -1 under high sulfur loading of 9.77 mg cm −2 ). Flexible Li-S batteries are also fabricated indicating the feasibility of the CNF/Ag@PPy current collector in flexible devices.
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Microsystems & Nanoengineering
·
2023
·Vol. 9
·期 1
·1-10
·
IF 7.9
Cheng Yuemeng,Feng Shaoqing,Ning Qihong,Li Tangan,Xu Hao,Sun Qingwen,Cui Daxiang,Wang Kan
In this research, we design and implement a small, convenient, and noninvasive paper-based microfluidic sweat sensor that can simultaneously detect multiple key biomarkers in human sweat. The origami structure of the chip includes colorimetric and electrochemical sensing regions. Different colorimetric sensing regions are modified with specific chromogenic reagents to selectively identify glucose, lactate, uric acid, and magnesium ions in sweat, as well as the pH value. The regions of electrochemical sensing detect cortisol in sweat by molecular imprinting. The entire chip is composed of hydrophilically and hydrophobically treated filter paper, and 3D microfluidic channels are constructed by using folding paper. The thread-based channels formed after the hydrophilic and hydrophobic modifications are used to control the rate of sweat flow, which in turn can be used to control the sequence of reactions in the differently developing colored regions to ensure that signals of the best color can be captured simultaneously by the colorimetric sensing regions. Finally, the results of on-body experiments verify the reliability of the proposed sweat sensor and its potential for the noninvasive identification of a variety of sweat biomarkers.
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Advanced Healthcare Materials
·
2023
·Vol. 12
·期 18
·2203344
·
IF 10
Qinyi Zhao,Ming Zhu,Gongwei Tian,Cuiyuan Liang,Zhiyuan Liu,Jianping Huang,Qianheng Yuan Yu,Shuanglong Tang,Jianhui Chen,Xizheng Zhao,Qi Zeng,Chongshen Guo,Dianpeng Qi
Flexible electrode array, a new-generation neural microelectrode, is a crucial tool for information exchange between living tissues and external electronics. Till date, advances in flexible neural microelectrodes are limited because of their high impedance and poor mechanical consistency at tissue interfaces. Herein, a highly sensitive and omnidirectionally stretchable polymeric electrode array (PEA) is introduced. Micropyramid–nanowire composite structures are constructed to increase the effective surface area of PEA, achieving an exponential reduction in impedance compared with gold (Au) and flat polypyrrole electrodes. Moreover, for the first time, a suspended umbrella structure to enable PEA with omnidirectional stretchability of up to ≈20% is designed. The PEA can withstand 1000 cycles of mechanical loads without decrease in performance. As a proof of concept, PEA is conformally attached to a rat heart and tibialis anterior muscle, and electrophysiological signals (electrocardiogram and electromyogram) of the rat are successfully recorded. This strategy provides a new perspective toward highly sensitive and omnidirectionally stretchable PEA that can facilitate the practical application of neural electrodes.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Ruimeng Wang,Xinqi Luan,Muhammad Yaseen,Jingyu Bao,Jing Li,Zhongxing Zhao,Zhenxia Zhao
High-capacity adsorption and removal of complex volatile organic compounds (VOCs) from real-world environments is a tough challenge for researchers. Herein, a swellable array adsorption strategy was proposed to realize the synergistic adsorption of toluene and formaldehyde on the flexible double hypercross-linked polymers (FD-HCPs). FD-HCPs exhibited multiple adsorption sites awarded by a hydrophobic benzene ring/pyrrole ring and a hydrophilic hydroxyl structural unit. The array benzene ring, hydroxyl, and pyrrole N sites in FD-HCPs effectively captured toluene and formaldehyde molecules through π–π conjugation and electrostatic interaction and weakened their mutual competitive adsorption. Interestingly, the strong binding force of toluene molecules to the skeleton deformed the pore structure of FD-HCPs and generated new adsorption microenvironments for the other adsorbate. This behavior significantly improved the adsorption capacity of FD-HCPs for toluene and formaldehyde by 20% under multiple VOCs. Moreover, the pyrrole group in FD-HCPs greatly hindered H2O molecule diffusion in the pore, thus efficiently weakening the competitive adsorption of H2O toward VOCs. These fascinating properties enabled FD-HCPs to achieve synergistic adsorption for multicomponent VOC vapor under a highly humid environment and overcame single-species VOC adsorption properties on state-of-the-art porous adsorbents. This work provides the practical feasibility of synergistic adsorption to remove complex VOCs in real-world environments.
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Molecular Catalysis
·
2023
·
IF 4.6
Tingting Ma,Chao Xu,Fengyang Liu,Yirong Feng,Wenyan Zhang,Weiwei Tang,Haoyu Zhang,Xiaowei Li,Yingying Nie,Shuangfei Zhao,Yuguang Li,Dong Ji,Zheng Fang,Wei He,Kai Guo
Selective epoxidation and allylic oxidation of cyclohexene were realized in the presence of BEA-Ti and (metallo)porphyrin catalysts. The integration of BEA-Ti and porphyrin H 2 MTPP afforded cyclohexene oxide with excellent selectivity (cyclohexene oxide/ 2-cyclohexen-1-one=85:15). BEA-Ti and metalloporphyrin MnMTPP yielded 2-cyclohexen-1-one with high selectivity (cyclohexene oxide/ 2-cyclohexen-1-one=12:88). Resulting active species involving of (metallo)porphyrin, Ti IV sites and tert-butyl hydroperoxide (TBHP) promoted the oxidation process of cyclohexene. A possible mechanism resulting in the formation cyclohexene oxide and 2-cyclohexen-1-one was proposed. The outer-sphere effect constructed by (metallo)porphyrin, Ti IV sites and TBHP on the surface of BEA-Ti framework improved the epoxidation and allylic oxidation both in the conversion and selectivity.
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Alexandria Engineering Journal
·
2023
·
IF 6.8
Nengli Xiao
The use of conductive polymers with excellent electrochemical properties and environmental friendliness is becoming increasingly important in the field of metal corrosion inhibition. To this end, a polypyrrole anticorrosive coating was synthesized on the surface of structural steel Q235 via potentiostatic deposition. By altering the deposition potential value in a stirred ice bath, the best deposition performance was achieved. It was found that potentiostatic deposition could yield effective anticorrosive coatings over a wide voltage range. The electrochemically deposited films were all Ppy films with C 2 O 4 2- . This proposed coating has extended the lifespan of metal materials in civil engineering applications.
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Acta Biomaterialia
·
2023
·
IF 9.7
Chenyi Huang,Jia Tang,Yuanqi Liu,Ting Chen,Junyang Qi,Shengjie Sun,Huisong Hao,Weiwei Zeng,Jing Zhao,Meiying Wu
Nitric oxide (NO) is a crucial gaseous medium for tumor growth and progression, but it may also cause mitochondrial disorder and DNA damage by drastically increasing its concentration in tumor. Due to its challenging administration and unpredictable release, NO based gas therapy is difficult to eliminate malignant tumor at low safe doses. To address these issues, herein, we develop a multifunctional nanocatalyst called Cu-doped polypyrrole (CuP) as an intelligent nanoplatform ( [email protected] ) to deliver the NO precursor BNN6 and specifically release NO in tumors. Under the aberrant metabolic environment of tumors, [email protected] catalyzes the conversion of antioxidant GSH into GSSG and excess H 2 O 2 into ·OH through Cu + /Cu 2+ cycle, which results in oxidative damage to tumor cells and the concomitant release of cargo BNN6. More importantly, after laser exposure, nanocatalyst CuP can absorb and convert photons into hyperthermia, which in turn, accelerates the aforesaid catalytic efficiency and pyrolyzes BNN6 into NO. Under the synergistic effect of hyperthermia, oxidative damage, and NO burst, almost complete tumor elimination is achieved in vivo with negligible toxicity to body. Such an ingenious combination of NO prodrug and nanocatalytic medicine provides a new insight into the development of NO based therapeutic strategies. Statement of significance A hyperthermia-responsive NO delivery nanoplatform ( [email protected] ) based on Cu-doped polypyrrole was designed and fabricated, in which CuP catalyzed the conversion of H 2 O 2 and GSH into ·OH and GSSG to induce intratumoral oxidative damage. After laser irradiation, hyperthermia ablation and responsive release of NO further coupled with oxidative damage to eliminate malignant tumors. This versatile nanoplatform provides new insights into the combined application of catalytic medicine and gas therapy.
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