ADVANCED FUNCTIONAL MATERIALS
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2021
·Vol. 31
·期 51
·2107160
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IF 18.808
Lie Wang,Er He,Rui Gao,Xiaotong Wu,Anwei Zhou,Jiang Lu,Tiancheng Zhao,Jiaxin Li,Yanjing Yun,Luhe Li,Tingting Ye,Yiding Jiao,Jiacheng Wang,Hao Chen,Dan Li,Xinghai Ning,Di Wu,Huisheng Peng,Ye Zhang
Biofuel cells that can convert the chemical energy of biomass such as glucose into electricity are expected to continuously obtain energy from living organisms and solve bottlenecks of energy supply for implanted electronics. However, the use of biofuel cells is limited mainly by the sharp drop in performance after implanting in living organisms caused by biofouling and electrode surface inactivation. Herein, a simple and effective strategy to overcome these problems by designing a porous antifouling interface on biofuel cells, is demonstrated. It resists the biofouling from body fluid while sustaining reactant penetration, and also enhances immobilization of enzymes. As a result, the biofuel cell can maintain almost 100% performance after implanting in living organisms, and a maximal output power of 76.6 mW cm -3 is achieved in vivo, which is ≈ 96 times of the highest performance reported to date. This strategy is universal and can be extended to the other electronic devices such as electrochemical sensors, which presents a new avenue for developing high-performance implanted electronics.
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Materials Today Chemistry
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2021
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IF 8.301
X. Jiao,H. Li,X. Cheng
This article deals with three cellulose-based fluorescent macromolecular sensors by introducing 1,8-naphthalimide fluorophore to cellulose . First, through the etherification reaction of cellulose with BrCH 2 CH 2 NH 2 , –NH 2 group–bearing cellulose CS 1 was obtained. Then, the –NH 2 group reacts with 4-bromo-1,8-naphthalic anhydride to synthesize a naphthalimide cellulose derivative ( CS 2 ). Finally, the recognition group was introduced by substituting Br atoms, and three cellulose fluorescent probes ( CS 3 , CS 4 , and CS 5 ) were obtained eventually. Structure and fluorescence properties of the macromolecular sensors were characterized and confirmed. Fluorescence detection measurements show that these probes can be used as selective and sensitive fluorescent sensors to 2,4,6-trinitrophenol (TNP). The detection limits are 0.52 μM, 0.76 μM, and 0.81 μM, indicating good detection performance. This work provides a new method for the selective detection of TNP and also a method to enlarge the application scope of cellulose.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Zhenming Wang,Junyu Chang,Hui Zhi,Chunsheng Li,Liang Feng
To achieve a real-time monitoring of ammonia (NH 3 ) from meat spoilage, a self-powered wireless sensing system has been fabricated, including a novel NH 3 sensor, a bluetooth module and a home-made sphere triboelectric nanogenerator (TENG). The system is self-powered and wireless, which meets up well with the demand of meat freshness monitoring, especially for the long-distance transportation. The sensor of the system is based on the polydopamine (PDA)- functionalized carbon nanotube (CNT) coated with polyaniline (PANI), showing superb sensing performance to NH 3 from 0.5 to 20 ppm, with a limit of detection of 38 ppb. And the sensor has presented outstanding anti-interference ability towards common interfering gases and exhibited outstanding stability during the experiments. The sensing system has advantages of portability, sustainability and non-pollution, making it a promising candidate of real-time monitoring application.
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LIQUID CRYSTALS
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2021
·
IF 0
Hao-Zhou Huang,Yue-Hua Cong,An Du,Bing Hu,Bao-Yan Zhang
A new series of liquid crystalline dimers containing a cholesteryl group were synthesised, exhibiting multiple mesophases including chiral smectic phases (SmC* and SmA*), twist grain boundary phases (TGBA*), and chiral nematic phase (N*). The chemical structure and liquid crystal properties of the dimers were characterised by FTIR, 1H-NMR, DSC, POM and XRD. It was in evidence that the lengths of the terminal tail and the flexible spacer were the decisive factors of the mesophase behaviours.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Yingnan Liu,Yaqing Xiao,Minghui Shang,Yuting Zhuang,Li Wang
The method of monitoring the freshness of seafood is not satisfactory for ensuring food safety. Here, we develop a filter membrane-based smart fluorescent tag with excellent biogenic amine response, which can monitor the freshness of seafood in real time and visually. We use green fluorescent fluorescein as an indicator and red fluorescent carbon quantum dots (RQDs) with aggregation-induced emission property as an internal reference. After simple mixing, they are deposited on the commercial filter membrane by physical deposition method to prepare the fluorescent tag. When amine molecules are present, the molecular conformation of fluorescein changes and the fluorescence increases rapidly, while RQDs have no obvious response, thus achieving a clear fluorescence color response to biogenic amines. Under UV light of 254 nm and 365 nm, the fluorescent tag showed sensitive, rapid, and color-responsive to ammonia in a wide range of 250–2.5 × 10 4 ppm. To further verify the practical application potential, the fluorescent tag was used to monitor the freshness of shrimp and crab in situ in real time, and satisfactory results were achieved. More importantly, owing to the reversible conformational change of fluorescein, the fluorescent tag can be reused and manufactured at low cost, making it a more attractive platform for freshness monitoring in the field of food safety.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Zhongyao Duan,Kai Deng,Chunjie Li,Mei Zhang,Ziqiang Wang,You Xu,Xiaonian Li,Liang Wang,Hongjing Wang
Hydrogen evolution reaction (HER) from water electrolysis in alkaline and neutral media provides a possibility to produce pure hydrogen fuel on a large scale. Therefore, the exploration of highly efficient non-Pt HER electrocatalysts is of great significance. Herein, polyaniline (PANI)-coated mesoporous Rh film on Ni foam is controllably fabricated by a micelle-assisted replacement reaction and the subsequent surface modification. Profiting from the synergetic effect of interconnected mesoporous structure, high electrical conductivity of PANI and the modified electronic structure of Rh, the synthesized mRh@PANI film exhibits superior HER electrocatalytic activity and durability in alkaline and neutral electrolytes. To reach a current density of 50 mA cm −2 , low overpotentials of 37 and 69 mV are required in 1 M KOH and 1 M PBS solutions, respectively.
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DYES AND PIGMENTS
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2021
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IF 4.889
Peng Wu,Yuan Xiong,Chen Lei,Yuan Li,Xiang Liu,Cheng Zhang,Yudie Sun,Jian Zhang,Chun-Sing Lee,Kui Zhang
Carbon dots or Carbon quantum dots (herein after abbreviated as CDs) with bight luminescence, derived from carbohydrates such as citric acid , glucose or sucrose, have been widely reported in recent publications. However, as to which functional groups and structures in CDs are responsible for luminescence, most explanations in current references are normally based on assumptions, instead of being convinced by the accurate information resting on experimental facts. Herein, we conducted an experimental study targeting at finding the fluorophores of CDs prepared from citric acid and glycine by fluorescent quenching. The experimental results revealed that the essence of fluorescence was manipulated by fluorophores of conjugated C C double bonds and aldehyde groups. The destruction of aldehyde groups or C C double bonds in the CDs led to a complete decay of luminescence. In addition, the results of this experiment were similar to those of CDs prepared from the sole citric acid, glucose or sucrose, which predicted the analogy of the CDs in chemical structures . Such information about fluorophore of CDs was valuable for further exploring more extensive application of CDs in sense technologies.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Zhijun Li,Siming Yan,Yi He,Chen Zhang,Hongjie Li,Peng Xie,Ze He,Yi Fan
Graphene oxide (GO), a preeminent two-dimensional (2D) material, has great potential application for corrosion protection owing to its excellent barrier properties to gas and liquid. Unfortunately, the poor dispersion in waterborne epoxy resins and excessive surface defects limit the further application of GO. In this study, a novel GO-based nanofiller PZ-GO (GO modified by polyaniline-wrapped alpha-zirconium phosphate) was designed to endow waterborne epoxy coating (WEC) system with durable anti-corrosion performance. Among them, the modification of alpha-zirconium phosphate (α-ZrP) wrapped with polyaniline (PZ) for GO not only enhanced the dispersion of GO but also strengthened its barrier effect. Notably, as a linker between GO and α-ZrP, PANI could also endow the coating with active inhibition performance. Differential scanning calorimetry (DSC) was introduced to investigate the effect of adding nanofillers on ‘Cure Index’ of composites. The ‘Cure Index’ of epoxy resins doped with PZ-GO was 1.139, which was considered as ‘Excellent’ according to the evaluation criteria, proving that the addition of PZ-GO significantly reinforced the curing degree of epoxy resins. A more complete cure of the epoxy resins could provide a stronger barrier ability for the coatings, thus improving the corrosion resistance of the coatings. Furthermore, the anticorrosive behavior of PZ-GO/WEC was analyzed via electrochemical impedance spectroscopy (EIS) and salt spray tests. The results showed that PZ-GO/WEC exhibited great anticorrosive performance (the impedance value was maintained at 8.72 ×10 7 Ω.cm 2 after immersion in 3.5 wt% NaCl solution for 80 days). In particular, PZ-GO/WEC also demonstrated great active inhibition performance. In addition, the active inhibition mechanism of PZ-GO/WEC was revealed by X-ray photoelectron spectroscopy (XPS) analysis of the corrosion products. All results proved that the excellent corrosion protection properties of PZ-GO/WEC for carbon steels originated from the outstanding barrier ability of PZ-GO/WEC and the active inhibition of PANI.
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Polymer Chemistry
·
2021
·Vol. 12
·期 35
·5059-5068
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IF 5.582
Yin Lu,Xinye Yu,Corey J. Evans,Shengfu Yang,Kan Zhang
Two novel acetylene-containing ortho-phthalimide functional benzoxazine monomers have been designed and synthesized in this work. We systematically investigated the effect of an additional acetylene moiety on the characteristics of ortho-phthalimide functional benzoxazines, with a particular focus on the structural configuration, polymerization behaviors and the associated thermal stability and flame retardancy of polybenzoxazine thermosets. We first employed NMR, FT-IR, elemental analysis, and density functional theory (DFT) calculations to study the structural details of benzoxazine, followed by DSC and in situ FT-IR spectroscopy to investigate the polymerization processes of each benzoxazine monomer. Specifically, the thermoset based on mono-benzoxazine bearing two acetylene groups exhibits extremely high thermal stability (Td5 of 404 °C; Tg of 297 °C) and excellent flame retardancy (HRC < 10 J g−1 K−1), although expected benzoxazole cyclization at a much higher temperature (∼400 °C) did not take place. Our work suggests that the incorporation of acetylene moieties in the ortho-phthalimide mono-benzoxazine is an effective strategy to improve the comprehensive properties of polybenzoxazine thermosets.
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Materials Today Physics
·
2021
·
IF 9.298
Feichong Yao,Wenhao Xie,Ming Yang,Hang Zhang,Hongbo Gu,Ai Du,Nithesh Naik,David P. Young,Jing Lin,Zhanhu Guo
With the purpose of ameliorating the electrical property, permittivity and magnetoresistance of polyaniline (PANI) nanofibers , three types of phenylenediamine (PDA), including o -PDA, m -PDA, and p -PDA, and different contents of PDA have been incorporated into the PANI polymer backbone by the interfacial copolymerization of aniline with PDA. The results demonstrate that different types and contents of PDAs could disclose the distinct effects on the chemical structures , crystalline structures, and morphologies for copolymers of aniline with PDA affirmed by Fourier transform infrared (FTIR) spectroscopy, solid-state 13 C nuclear magnetic resonance ( 13 C NMR), X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The molecular weight of all copolymers is reduced by several orders of magnitude relative to pure PANI nanofibers confirmed by gel permeation chromatography (GPC). The resistivity variations for the copolymers of aniline with different types of PDAs are well explained from the point view of their molecular structures based on the first-principle simulations (i.e. intrachain electrical conductivity) and degree of crystallinity gained from XRD (i.e. interchain electrical conductivity). A tunable room-temperature magnetoresistance (MR) and a controllable negative permittivity are discovered in the copolymers of aniline with different types and contents of PDAs. This work provides a new insight for the manipulation of electrical transport for PANI nanofibers and helps seek the new applications of conductive polymer .
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Chao Yu,Jianping Song,Zhongfei Ma,Jian Lu,Wendong Xing,Minjia Meng,Jiangdong Dai,Yongsheng Yan,Yilin Wu
Janus imprinted membrane (JIM) fabricated through the connective method of phase inversion and dip-coating processes has gained considerable attention in the separation field. Herein, a JIM with specific artificial receptors was prepared for the selective adsorption and separation of tetrabromobisphenol A (TBBPA) and cadmium ion (Cd 2+ ). Dip coating method performed on the smooth surface of plate glass was used for the growth of polyaniline (PANI) imprinted polymers with specific imprinted cavities for TBBPA. The casting solution was coated on the imprinted polymers, which was then immersed into the coagulating bath containing gallic acid (GA) to achieve a delayed phase inversion process. The adsorption results showed that the rebinding capacities of the JIM for TBBPA and Cd 2+ were 58.279 mg g −1 and 83.159 mg g −1 , respectively. Meanwhile, the JIM exhibited superior rebinding selectivity with selectivity coefficients of 2.56, 2.87, 3.07, 2.52, 3.53, 3.66 and 4.05 for Pb 2+ , Cu 2+ , Zn 2+ , Sn 2+ , Hg 2+ , Co 2+ and Cr 3+ and 2.44, 2.56, 2.67 for BP, BPA and BBPA, respectively. The synthesized JIM showed tiny changes in rebinding capacity after 10 times cycles, revealing desirable regeneration performance. Finally, the pollutants on membrane surface were severally collected to avert the secondary pollution. The current study demonstrated that connective method is a promising method for selective rebinding and sorting treatment of different pollutants.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
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IF 3.171
Yipeng Zheng,Zhennan Cao,Zheng Zhou,Gaodong Yang,Zhibing Zhang
A series of SO 3 -functional Brønsted acidic ionic liquids (SBAILs) were prepared to catalyze the N -formylation of aniline with DMF . The reaction conditions such as ionic liquid type, reaction temperature, catalyst loading and molar ratio of reactants were investigated. To the best of our knowledge, kinetic model for the N -formylation of aniline with DMF using SBAIL was firstly built and simulated. The studies on the reaction order of the reaction were evaluated by initial concentration method, and the kinetic parameters such as reaction rate constant and activation energy were proposed and used to explain the catalytic activities of the SBAILs catalysts. Accordingly, the recycling experiments showed that the SBAIL [Bsmim][HSO 4 ] can be easily recovered and reused with stable activity. Further, the temperature-controlled study emphasized that the ionic liquid was easy to be separated and environmentally friendly.
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