JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zhipeng Mao,Wei Hao,Wei Wang,Fubin Ma,Chengcheng Ma,Shougang Chen
As an influential antifouling material, photocatalytic materials have drawn attention increasingly over recent years owing to their potential bacteriostatic property in the domain of marine antifouling. Herein, a flower-like BiOI@CeO 2 @Ti 3 C 2 S-scheme photocatalyst was contrived and prepared by hydrothermal method . The innovative combination of Ti 3 C 2 and narrow band gap semiconductor BiOI was implemented to modify CeO 2 and the photocatalytic bacteriostatic mechanism of BiOI@CeO 2 @Ti 3 C 2 was elucidated. Schottky junction was formed between CeO 2 and Ti 3 C 2 , and a p-n junction was formed between CeO 2 and BiOI. By photoelectrochemical characterization, BCT-10 exhibits the best photoelectrochemical performance of which photogenerated carrier transport can be performed more readily at 10 % CeO 2 @Ti 3 C 2 addition. 99.76 % and 99.89 % of photocatalytic bacteriostatic efficiency of BCT-10 against Escherichia coli and Staphylococcus aureus were implemented respectively, which were 2.98 and 3.07 times higher than that of pure CeO 2 . The ternary heterojunction can suppress photogenerated electron-hole complexes more effectively and enhance the photocatalytic bacteriostatic effect of CeO 2 , which also provided a new concept to the further broadened application of CeO 2 in the marine bacteriostatic and antifouling field.
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高影响因子
Regenerative Biomaterials
·
2022
·
IF 5.763
Dou Jie,Yang Rong,Jin Xingxing,Li Pengfei,Han Xiao,Wang Lijuan,Chi Bo,Shen Jian,Yuan Jiang
Nitric oxide (NO) plays an important role in wound healing, due to its ability to contract wound surfaces, dilate blood vessels, participate in inflammation as well as promote collagen synthesis, angiogenesis and fibroblast proliferation. Herein, keratin was first nitrosated to afford S-nitrosated keratin (KSNO). As a NO donor, KSNO was then co-electrospun with polyurethane (PU). These as-spun PU/KSNO biocomposite mats could release NO sustainably for 72 h, matching the renewal time of the wound dressing. Moreover, these mats exhibited excellent cytocompatibility with good cell adhesion and cell migration. Further, the biocomposite mats exhibited antibacterial properties without inducing severe inflammatory responses. The wound repair in vivo demonstrated that these mats accelerated wound healing by promoting tissue formation, collagen deposition, cell migration, re-epithelialization and angiogenesis. Overall, PU/KSNO mats may be promising candidates for wound dressing.
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ANALYST
·
2022
·Vol. 147
·期 16
·3675-3683
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IF 5.227
Chunyu Gao,Ziyi Ding,Jiangkun Tan,Jinmao You,Zan Li
Studies have shown that homocysteine (Hcy) levels are closely related to cardiovascular and cerebrovascular diseases. In this work, we have developed and synthesized three copper complexes, F542-Cu2+, F508-Cu2+, and F465-Cu2+ for Hcy detection. The different binding constants (Ks) of the copper complexes endow them with dramatic reactivity toward biothiols. The pyridine-containing tetraazacycle was employed in the construction of F542-Cu2+, which renders the medium Ks value for the copper complex compared with cyclen and TACN and effectively prevented the disintegration of the complexes. Pyridine-containing tetraazacycle provided the basis and possibility for the hypothesis for the reduction of Cu2+ by biothiols to shape into a stable six-membered ring structure. The obtained results verified that F542-Cu2+ could be utilized to specifically probe Hcy in a switched-on fluorescence mode. F542-Cu2+ exhibited excellent environmental stability, superior sensitivity, and outstanding selectivity toward Hcy under physiological conditions. The mechanism of Hcy specificity was confirmed to be related to the generation of Hcy-induced six-membered ring by fluorescence imaging, time-dependent fluorescence spectra, ESI-MS, and electron paramagnetic resonance (EPR) analyses. Furthermore, we exploited the application of F542-Cu2+ and developed a strategy for evaluating the activity of S-adenosylhomocysteine hydrolase (AHCY) in vitro by fluorescence analysis. More importantly, real-time in vivo evaluation of the enzymatic activity of AHCY was realized and assisted by our probe, providing the possibility of opening up a new avenue for enzymatic reaction assessment.
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Polymer Chemistry
·
2022
·Vol. 13
·期 35
·5082-5093
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IF 5.364
Xingfeng Lei,Guo Xiong,Yuyang Xiao,Tianhao Huang,Xiangze Xin,Shuyu Xue,Qiuyu Zhang
Shape memory polymers (SMPs) show tremendous application prospect in various fields owing to their stimuli responsiveness. However, their application in the high value-added aerospace industry still remains a great challenge, since it is problematic to engineer SMPs with both ideal shape memory properties and high heat resistance as well as outstanding mechanical strength. Herein, by incorporating amide hydrogen bonding interactions into a robust imide polymer backbone, a series of poly(amide-imide) hybridization networks have been fabricated, showcasing superior shape memory behavior together with impressive thermal stability and high mechanical strength, with a Tg above 300 °C and a tensile strength up to 108.3 MPa. Among all polymers, m-3FPAI exhibits outstanding heat resistance, high mechanical strength, low moisture sensitivity, excellent shape memory property and prominent multiple shape memory tolerance. After six consecutive cycles, a Rf still above 98.5% with a Rr ranging from 97.8% to 100% was observed, making m-3FPAI a promising candidate to be used in aerospace application.
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MACROMOLECULES
·
2022
·
IF 6.057
Gaopeng Shi,Xiaoning Geng,Yuanbiao Liu,Guozhang Wu
Enthalpy hysteresis (ΔHR), an easily accessible quantity determined from a well-defined cooling and subsequent heating cycle of heat capacity curves, was recently reported to bear a proportional relationship with the α-related excess entropy of polymers at glass transition temperature( Tg). The kinetic fragility m of polymers was thus verified to link with thermodynamic parameters of Tg·ΔCp/ΔHR, as predicted by the Adam–Gibbs equation. In this work, enthalpy hysteresis of poly(n-alkyl methacrylate)s was investigated systematically to clarify whether ΔHR is influenced by multifarious non-α-related contributions. The results showed that the ΔHR for higher poly(n-alkyl methacrylate)s is abnormally suppressed, as manifested by failure of the theoretic correlation between m and Tg·ΔCp/ΔHR. The anomalous suppression appears non-related to the βJG relaxation but stems from nanophase separation of the alkyl sidechains. Once the PE-like nanophase is completely destroyed, either by increasing the steric hindrance of side groups or by introducing small molecule-bridged hydrogen bonds, ΔHR recovers, and the theoretic correlation between m and Tg·ΔCp/ΔHR is re-established. Further experiments revealed that the abnormal ΔHR suppression occurs only when the periodicity of phase separation is comparable to the size of the cooperative rearrangement region of bulk α relaxation at Tg. Accordingly, the deviation of m and Tg·ΔCp/ΔHR correlations from the theoretic prediction must be related to the existence of two different but partly coupled glass transitions in higher poly(n-alkyl methacrylate)s. The extremely hindered and confined glass transition in the PE-like nanodomains is likely to cause the anomalous suppression of global enthalpy hysteresis.
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POLYMER
·
2022
·
IF 4.432
Zhen Wang,Shu Feng Zhou,Yi Zhi Zhuo,Ao Nan Lai,You Zhong Lu,Xiao Bin Wu
Current anion exchange membranes (AEMs) for fuel cells suffer from low ionic conductivity and poor mechanical property. Herein, we introduce adamantane groups onto the block poly(arylene ether sulfone)s backbone to form the selected comb-shaped structure. The structure-property relationships of the AEMs are investigated by varying the ratio of the hydrophobic to hydrophilic segments. The bulk rigid adamantane group can restrain the swelling of the AEMs thus enhancing the mechanical properties and expand the spacing between the hydrophilic/hydrophobic segments of the polymer chains to promote the formation of microphase separation morphology. Consequently, as characterized by atomic force microscope (AFM) and transmission electron microscopy (TEM), the resulting membranes show well-defined microphase separation between the hydrophilic/hydrophobic segments, resulting in high ionic conductivity range from 27.4 to 90.2 mS cm −1 over a temperature range of 30–80 °C. At the same time, the membranes present ultralow swelling ratio with the levels from 1.6% to 6.1% at 30 °C and from 6.8% to 12.7% at 80 °C, respectively, and thus excellent mechanical properties with the tensile strength as high as 11.52 MPa and elongation at break of 29.28%. The excellent comprehensive properties grant the prepared AEMs bright future for fuel cells.
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Nanoscale
·
2022
·Vol. 14
·期 39
·14520-14528
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IF 8.307
Weiwei Xu,Ningbo Fan,Shiji Xu,Linxing Meng,Bin Xu,Min Zhou,Wei Tian,Liang Li
Introducing suitable interfacial chemical bonds into heterojunctions can increase the charge carrier density, propel the charge separation, and facilitate interfacial charge extraction in photoanodes for photoelectrochemical (PEC) water oxidation. However, tuning chemical bonds at heterojunction interfaces and elucidating their influences on band alignment and the associated evolution of PEC performance remain elusive. Herein, Bi–S bonds were introduced into the interface of a CdIn2S4 (CIS)/Bi2WO6 (BWO) heterojunction. In situ irradiated X-ray photoelectron spectroscopy and electron spin resonance signals confirm that the Bi–S bond transforms the band alignment from type II to the direct Z-scheme, significantly enhancing the carrier separation efficiency. Theoretical calculations show that the Bi–S bond not only acts as an atomic-level charge transfer channel, but also changes the migration pathway and distance within the heterojunction. As a result, the optimized CIS/BWO photoanode exhibits a relatively high PEC performance of 4.25 mA cm−2 at 1.23 V vs. RHE (VRHE) and a low onset potential of 0.30 VRHE. This work presents a new avenue to construct comprehensively improved photoanodes by tuning the interfacial structures at the atomic level.
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Materials
·
2021
·Vol. 14
·期 24
·7655
·
IF 3.623
Huaijiu Deng,Mattia Biesuz,Monika Vilémová,Milad Kermani,Jakub Veverka,Václav Tyrpekl,Chunfeng Hu,Salvatore Grasso
We report on an ultrarapid (6 s) consolidation of binder-less WC using a novel Ultrahigh temperature Flash Sintering (UFS) approach. The UFS technique bridges the gap between electric resistance sintering (≪1 s) and flash spark plasma sintering (20–60 s). Compared to the well-established spark plasma sintering, the proposed approach results in improved energy efficiency with massive energy and time savings while maintaining a comparable relative density (94.6%) and Vickers hardness of 2124 HV. The novelty of this work relies on (i) multiple steps current discharge profile to suit the rapid change of electrical conductivity experienced by the sintering powder, (ii) upgraded low thermal inertia CFC dies and (iii) ultra-high consolidation temperature approaching 2750 °C. Compared to SPS process, the UFS process is highly energy efficient (≈200 times faster and it consumes ≈95% less energy) and it holds the promise of energy efficient and ultrafast consolidation of several conductive refractory compounds.Keywords:tungsten carbide;ultrarapid consolidation;ultrahigh temperature flash sintering
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高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 3
·716-724
·
IF 5.693
Yan Zhaoqian,Sun Zhihao,Li Anran,Liu Hongshou,Guo Zihao,Qian Lei
Traditional Fe-based oxide with poor intrinsic conductivity, severe volume expansion, and structure destruction exhibits the poor cyclic performance for anode materials of lithium ion batteries (LIBs). Heteroatomic doping Fe-based oxide with nanoarchitectures is deemed to settle the above problems effectively. Herein, with sulfur (S) doping, three-dimensional porous flower-like Fe 2 O 3 (denoted as S- Fe 2 O 3 ) prepared via ordinary solvothermal reaction and calcining process was ingeniously designed as anode materials for LIBs. The S doping changed the morphology, improved the electrical conductivity, and provided more active sites for lithium storage. The flower-like S-Fe 2 O 3 made up of plentiful carbon encapsulated nanoparticles not only relieved the volume expansion but also provided the connected conductive network. The as-prepared flower-like S-Fe 2 O 3 electrode delivered a high discharge/charge capacity (1570.8 mAh g −1 at 0.1 A g −1 after 100 cycles) and the excellent long-cycle performance (521.3 mAh g −1 at 2.0 A g −1 after 1000 cycles). S doping and nanoarchitectures engineering in this work provide rational preparation strategies for composites containing transition metal oxides toward energy storage system. Graphical abstract Three-dimensional porous flower-like S-Fe 2 O 3 from ordinary solvothermal reaction and calcining process is ingeniously designed as anode materials for LIBs.
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FIBERS AND POLYMERS
·
2021
·Vol. 22
·期 5
·1208-1217
·
IF 2.153
Zhao Chenyu,Wang Guangshu,Sun Mengtao,Cai Zewei,Yin Zichu,Cai Yurong
As one of the most important parameters to characterize the organic pollution of water, biochemical oxygen demand (BOD) determined through a rapid, in situ and on line method is very attractive. In this paper, a new BOD biosensor has been developed, which are composed of the ecofriendly precursor of Saccharomyces cerevisiae ( S. cerevisiae ) embedded in bacterial cellulose (BC) matrix and the Ketjen Black (KB) modified glassy-carbon electrode. Furthermore, a doublemediator system is constructed using potassium ferricyanide and menadione in reaction cell to transfer electron from the microbe to electrode. The responses of glucose glutamic acid (GGA) standard solutions are amperomertrically measured with an applied potential of 0.25 V versus Hg/Hg 2 Cl 2 in a three-electrode system. Under the optimum conditions, the (BC/ S. cerevisiae -menadione)/KB modified electrode shows a high operational stability with relative standard deviation (RSD) of 4.16% (fourteen assays), a good repeatability (RSD=3.10%), a fast response time (in 20 minutes) and a wide linear range (from 10–220 mg O 2 l −1 ). The BOD values measured by this method have been highly correlated with the standard BOD 5-day method for wastewater samples (R 2 =0.9859, n=3), indicating that it can meet the requirement of BOD rapid measurement.
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Materials Express
·
2020
·Vol. 10
·期 10
·1725-1731
·
IF 1.65
Duan Xiaobo,Ding Yanhong,Yu Meng
Multilayer graphene was prepared in this study by microwave burst method. Cu9S5/CoS/graphene and CuS/CoS2/graphene composites were obtained by hydrothermal method to regulate the molecular structure and combination of Cu and Co metal sulfides on graphene
substrate. Graphite oxide was doped by hydrothermal method, and then Cu9S5/CoS/graphene composite was prepared by microwave explosion method. Raman, SEM and TEM were used to characterize the self-made graphene. Results showed that the multilayer graphene had a bag-like
structure which was beneficial to anchor sulfide. Three graphene-based composites were characterized by scanning electron microscopy, X-ray diffraction, energy spectrum analysis and electrochemical properties. Moreover, results showed that CuS/CoS2/graphene had the best electrochemical
performance, and its specific capacity reached 324 F/g when the current density was 1 A · g–1, which was much higher than that of the other two samples. Capacity retention rate, interfacial charge transfer resistance and electrolyte diffusion resistance also have advantages.
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ACS Nano
·
2020
·
IF 14.588
Qingping Wu,Zhenguo Yao,Xuejun Zhou,Jun Xu,Fahai Cao,Chilin Li
A cathode host with strong sulfur/polysulfide confinement and fast redox kinetics is a challenging demand for high-loading lithium–sulfur batteries. Recently, porous carbon hosts derived from metal–organic frameworks (MOFs) have attracted wide attention due to their unique spatial structure and customizable reaction sites. However, the loading and rate performance of Li–S cells are still restricted by the disordered pore distribution and surface catalysis in these hosts. Here, we propose a concept of built-in catalysis to accelerate lithium polysulfide (LiPSs) conversion in confined nanoreactors, i.e., laterally stacked ordered crevice pores encompassed by MoS2-decorated carbon thin layers. The functions of S-fixability and LiPS catalysis in these mesoporous cavity reactors benefit from the 2D interface contact between ultrathin catalytic MoS2 and conductive C pyrolyzed from Al-MOF. The integrated function of adsorption–catalysis–conversion endows the sulfur-infused C@MoS2 electrode with a high initial capacity of 1240 mAh g–1 at 0.2 C, long life cycle stability of at least 1000 cycles at 2 C, and high rate endurance up to 20 C. This electrode also exhibits commercial potential in view of considerable capacity release and reversibility under high sulfur loading (6 mg cm–2 and ∼80 wt %) and lean electrolyte (E/S ratio of 5 μL mg–1). This study provides a promising design solution of a catalysis–conduction 2D interface in a 3D skeleton for high-loading Li–S batteries.
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