INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
·
IF 4.784
Xinxin Yang,Zhaoshuang Li,He Liu,Lina Ma,Xujuan Huang,Zhaosheng Cai,Xu Xu,Shibin Shang,Zhanqian Song
N-vinylcaprolactam (NVCL) is a temperature-responsive monomer, which is widely used for preparing responsive hydrogels. However, poor water solubility of NVCL necessitates the use of emulsifiers for better dispersion. Hydrolyzed epoxy soybean oil-grafted hydroxyethyl cellulose (H-ESO-HEC) polymeric emulsifier has excellent emulsifying properties, and the carboxyl groups afford pH-responsiveness to the hydrogels. A novel temperature- and pH-responsive cellulose-based hydrogel was prepared by combining NVCL and H-ESO-HEC. The hydrogel morphology, thermal stability , and swelling capacity were characterized, and it was also used as a dual-responsive drug preservative carrier. Scanning electron microscopy and thermogravimetric analysis confirmed the porous structure and good thermal stability, respectively, of the hydrogel. The hydrogel displayed a temperature- and pH-dependent swelling behavior and improved swelling capacity. The swelling behavior agreed well with the Korsmeyer-Peppas model and Schott's second-order kinetic model. The dual-responsive hydrogel has significant potential in the drug delivery systems owing to its biocompatibility and temperature and pH sensitivity.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Guo Ye,Zizheng Song,Tianhao Yu,Qishuo Tan,Yan Zhang,Tinglei Chen,Changcheng He,Lihua Jin,Nan Liu
Stretchable conductors have been achieved by stacking conductive nanomaterials onto the surfaces of elastomeric substrates. However, many of them show a dramatic decrease in conductivity under strain without an efficient way for the conductive layer to release strain. Here, we report a transparent, stretchable, and self-healing conductor with excellent mechanoelectrical stability by introducing dynamic bonding between conductive nanomaterials and an elastomeric substrate. We prepare the conductor by semiembedding Ag nanowires (AgNWs) into a self-healing polydimethylsiloxane (PDMS)-based elastomer, which is modified with bipyridine (Bpy) ligand and further cross-linked by adding Zn2+ as coordinator (Zn–Bpy–PDMS). The dynamic Ag–N bonds not only improve the wettability of the substrate and facilitate the spreading of AgNWs but also reversibly break and reform to accommodate the deformation of AgNWs. As a result, the resistance increase of Zn–Bpy–PDMS/AgNWs is much smaller than that without the dynamic bonding (PDMS/AgNWs). Besides, this conductor exhibits excellent conductivity (76.2 Ω/sq) and transparency (86.6% @ 550 nm), as well as extraordinary self-healing property with a low resistance increase (ΔR/R0 ∼ 1.4) after healing at room temperature for 1 day. This work provides insights into the future design of integrated electronic skin with transparency, stretchability, conductivity, and self-healing capability for applications in wearable optoelectronic devices.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 15
·B1594
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IF 3.12
Huiming Tian,Bing Tan,Xueming Dang,Huimin Zhao
Detecting hydrogen peroxide (H2O2) is obviously indispensable on account of its low toxicity and wide application, and it is still a challenge for developing highly sensitive and selective electrochemiluminescence (ECL) sensors based on the noble metal-free electrode. Hence, we designed an accurate ECL sensor for detecting trace H2O2 based on N-doped porous carbon containing Fe (Fe/N-C) nanocomposites, which were successfully synthesized by pyrolysis of NH2-MIL-101(Fe) metal-organic framework (MOF). Fe/N-C nanocomposite significantly improved the electron transfer process and enhanced the catalytic activity of ECL sensor for trace H2O2 detection. Fe/N-C nanocomposite significantly contributed in the conversion of H2O2 to superoxide radical, followed by the oxidation of luminal which enhanced the electrochemical luminescence signal. Predictably, the ECL sensing strategy at Fe/N-C nanocomposite electrode showed a satisfying linear range from 1 nM to 300 nM for H2O2 detection with limit of detection (LOD) as 0.93 nM (signal to noise ratio (S/N) = 3). Also, the ECL sensor was used to detect H2O2 in real water samples and renal epithelial 293T cells, which justified great promise for the practical ECL detection of H2O2.
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JOURNAL OF NANOPARTICLE RESEARCH
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2020
·Vol. 22
·期 1
·1-12
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IF 2.132
Hou Junjie,Zhou Xuemei,Yang Zhi,Nie Huagui
Oxygen evolution reaction (OER) catalysts are of central importance for electrocatalytic water oxidation and fuel generation, while it is still an urgent requirement to design and develop efficient OER catalysts with rapid kinetics and low overpotentials. Herein, we report an electrochemical deposition method to fabricate carbon nanotubes/N-doped cuprous sulfide (CNTs/N-Cu 2 S) composites using thiourea and a CuSO 4 solution as the S and Cu sources, respectively. The advantages of this strategy include low cost, simple processing and the absence of templates or surfactants that can otherwise affect the electrochemical properties of the products. The N supplied by the thiourea can be used as a doping agent as a result of the in situ formation of small N-Cu 2 S particles, which can increase larger surface area and create more active sites to enhance OER catalytic activity, compared with that obtained with materials synthesized without adding the thiourea. The synergic interface of CNTs and N-Cu 2 S can improve conductivity and efficient chemical transfer in the composites electrodes by introducing CNTs. Under the optimal experimental conditions, the CNTs/N-Cu 2 S-5cyc composites present an excellent activity with the current density of 10 mA cm −2 at a low OER overpotential of 280 mV, the Tafel slope of 63 mV dec −1 and a strong electrochemical stability in 1.0 M KOH solution.
Graphical abstract
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ACS Omega
·
2022
·
IF 4.132
Tianxiang Jin,Jingwei Su,Qingyun Luo,Wei Zhu,Haizhen Lai,Dejuan Huang,Chunyan Wang
Biomass-derived activated carbon is a widely used electrode material for supercapacitors. One of the keys to preparing high-performance activated carbon is the selection of appropriate precursors. Daylily is a common edible herb and is widely planted in Asia. It is rich in nitrogen and phosphorus, so it can be used as a precursor of heteroatom-doped activated carbon. Herein, a daylily-derived porous carbon with a large specific surface area and high content of heteroatoms has been successfully prepared by a simple carbonization method. The as-prepared carbon materials showed a remarkable specific capacitance of 299.1 F/g at 0.5 A/g and excellent cycling stability of 99.6% after 4000 cycles at a current density of 1 A/g. Moreover, the assembled symmetric supercapacitor showed a high energy density of 21.6 Wh/kg at a power density of 598.2 W/kg in 6 M KOH electrolyte. These results demonstrate that the daylily-derived porous carbon is an excellent material for high-performance supercapacitors.
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高影响因子
PHARMACOLOGICAL RESEARCH
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2022
·
IF 10.334
Yuhang Li,Yitian Li,Sennan Xu,Yue Chen,Pan Zhou,Ting Hu,Hua Li,Ying Liu,Yaping Xu,Jie Ren,Yan Qiu,Canzhong Lu
Psoriasis is an incurable autoimmune disease that affects 2–3% of the world’s population. Limited understanding of its pathogenesis hinders the development of therapies for the disease. Herein, we reported that N-acylethanolamine acid amidase (NAAA), a cysteine enzyme that catalyzes the hydrolysis of fatty acid ethanolamides (FAEs), was upregulated in psoriasis patients and imiquimod (IMQ)-induced mouse model of psoriasis. The upregulated NAAA contributes to the progression of psoriasis via enhancing dendritic cell (DCs) maturation. Transgenic expression of NAAA in mice accelerated the development of psoriasis, whereas genetic ablation of NAAA or local administration of NAAA inhibitor F96 ameliorated psoriasis. NAAA expressed in dendritic cells (DCs), but not in macrophages, T cells, or keratinocytes plays a critical role in psoriasis development. In addition, the results showed that NAAA degrades palmitoylethanolamide (PEA) and reduces PEA-PPARα-mediated dissociation of NF-κB p65 from Sirtuin 1 (SIRT1), subsequently, repressing the acetylation of p65 and down-regulating IL10 production. The decreased IL10 then leads to the maturation of DCs, thus promoting the development of psoriasis. These results provide new insights into the pathophysiological mechanism of psoriasis and identify NAAA as a novel target for the treatment of psoriasis.
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Yunrui Zhang,Hong Zhang,Yinuo Zhao,Xingyan Han,Haijun Wang,Yongjun Gao
Boron and nitrogen co-doped carbon materials were synthesized by using sustainable chitin as precursor and boric acid as recyclable template. The carbon product possessing high surface area (1100–1400 m 2 /g) and micro- and mesoporous structure exhibited excellent catalytic activity in the oxidation of benzylic C H bond of ethylbenzene. Characterizations demonstrate that there are boron nitride (BN) bonds in carbon product achieved at higher calcining temperature. Experimental results and density functional theory (DFT) calculations suggest that the boron nitride domains locating in the carbocatalyst are essential to its catalytic activity. B dopants could anchor active oxygen-containing groups and then transfer oxygen atoms to substrate during the whole catalytic process.
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JOURNAL OF NATURAL PRODUCTS
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2014
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IF 3.947
Hongmin Wang,Ruonan Ning,Yu Shen,Zhenhua Chen,Jinlong Li,Rujun Zhang,Ying Leng,Weimin Zhao
Fourteen new 3,4-seco-cycloartane-type triterpenes, lithocarpic acids A–N (1–14), together with one known compound, coccinetane E (15), were identified from the cupules of Lithocarpus polystachyus. The structures of 1–14 were determined by spectroscopic data analysis and chemical methods, and the absolute configurations of 1 and 4 were defined unequivocally by X-ray crystallography using Cu Kα radiation. Compounds 1–15 are the first examples of 3,4-seco-cycloartane derivatives isolated from the genus Lithocarpus. Among them, compounds 1 and 2, 9 and 10, and 11 and 12 were found to be three pairs of C-24 epimers, while compounds 7 and 8 represent the first examples of 3,4-seco-norcycloartane-type triterpenes. Compound 1, as the major component of the plant extract, showed potent antibacterial activity against Micrococcus luteus and Bacillus subtilis, with MIC values of 3.1 and 6.3 μg/mL, respectively, as well as inhibitory activity against human and mouse 11β-hydroxysteroid dehydrogenase type 1, with IC50 values of 1.9 and 0.24 μM, respectively.
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Catalysts
·
2023
·Vol. 13
·期 12
·1459
·
IF 3.9
Ou Sha,Xifeng Lu,Pei Su
The electrochemical advanced oxidation process is a promising technology for tackling wastewater pollution, but it suffers from poor pH adaptability and slow catalytic kinetics in a neutral and alkaline environment in a homogeneous system, as well as fast release of metal ions in a heterogeneous system. Herein, a boron- and nitrogen-codoped carbon nanotube-encapsulated transition metal (M@BN-C, M–Co, Cu) cathode with a similar structure was synthesized to explore activity trends and mechanisms. Characteristics of Co@BN-C and Cu@BN-C cathodes were examined and compared with the previously synthesized Fe@BN-C bifunctional cathode. The activity of sulfamethazine (SMT) degradation by the Co@BN-C cathode was higher than both Fe@BN-C and Cu@BN-C at pH = 3 and pH = 7, respectively. However, the activity of Co@BN-C was also higher than that of Cu@BN-C and lower than that of Fe@BN-C at pH = 9. It was observed that•OH and1O2were the main reactive oxygen species (ROS) using Co@BN-C and Cu@BN-C cathodes. The Co@BN-C generated the highest•OH for efficient SMT degradation through abundant H2O2generation, exhibiting the highest catalytic activity compared with the Cu@BN-C cathode. Overall, SMT degradation on the Co@BN-C cathode demonstrated better catalytic performance in real wastewater. This study provided insights into the fundamental catalytic trends and mechanisms of ROS production via the M@BN-C cathode, thus contributing to the development of the M@BN-C cathode for catalytic organic pollutant degradation.Keywords:electrocatalysis;water treatment;bifunctional cathode;reactive oxygen species;mechanism
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ACTA MATERIALIA
·
2023
·
IF 9.4
Yiqing Wei,Jingwei Li,Daliang Zhang,Bin Zhang,Zizhen Zhou,Guang Han,Guoyu Wang,Carmelo Prestipino,Pierric Lemoine,Emmanuel Guilmeau,Xu Lu,Xiaoyuan Zhou
Microstructure control is crucial for thermoelectrics since it is intimately related to the scattering mechanism of both electrons and phonons. Herein, we propose a new strategy to modify microstructure by phase regulation that simultaneously induces high carrier mobility and low lattice thermal conductivity . As demonstrated in layered SnSe 2 , the addition of Cu can induce a phase transition from space group P 3 ¯ m 1 to P 6 3 mc . Due to the enlarged formation energy of stacking faults in the later phase, the stacking fault density is greatly reduced after heat treatment that leads to an increased grain size . Accordingly, the carrier mobility of SnSe 1.97 Br 0.03 –3 % Cu sample is enhanced by 100 % at room temperature. Furthermore, the reduction of stacking fault density is accompanied by the formation of pores in the matrix, which results in low lattice thermal conductivity . As a result, a record peak zT of 1.13 for SnSe 2 -based materials is achieved at 773 K, and the attained ZT ave of 0.62 is a record-high value among n -type polycrystalline layered materials working in intermediate-to-high temperature region. This work provides a feasible strategy to decouple the electron and phonon transport in layered thermoelectric compounds by phase-dependent microstructure modification.
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Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Jiayin Chen,Zeyun Cai,Weizong Bao,Tian Gao,Guoqiang Xie
The trade-off between strength and ductility is a prevalent issue in strengthening commercially pure titanium (CP–Ti). This study presents a method to prepare ultra-high strength Ti–N alloys with adequate ductility using ball-milling (BM) and spark plasma sintering (SPS) techniques, based on nitrogen solid solution and grain refinement strengthening. The effect of ball milling time of mixed powders on mechanical properties of Ti–N alloys was studied systematically. Quantitative analysis reveals that solid solution strengthening and grain refinement strengthening worked synergistically to enhance yield strength of alloys. The Ti–N alloys with the most favorable mechanical properties demonstrated a yield strength of 1606 MPa and a compressive plastic strain of 14.44 %. The development of novel Ti–N alloys provides a viable strategy for the advancement of high-performance titanium alloys using ubiquitous elements.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yubao Li,Hanke Li,Shuang Li,Ming Li,Ping He,Yao Xiao,Jiufu Chen,Yafen Zhou,Tongyan Ren
Photocatalytic water splitting for hydrogen evolution is viewed as a promising strategy to address the energy and environmental issues. In this study, a series of NiO/Zn 3 In 2 S 6 (NiO/ZIS 6 ) p-n heterojunction photocatalysts have been prepared by the facile ultrasonic assisted deposition method. The as-obtained samples were systematically characterized employing various testing techniques. The photocatalytic performance of the p-n photocatalysts were evaluated by photocatalytic hydrogen production and the effect of different mass ratios of NiO to ZIS 6 on photocatalytic hydrogen evolution performance was also explored. The results indicated that the 25% NiO/ZIS 6 sample demonstrates optimal photocatalytic hydrogen evolution activity with a hydrogen evoluton rate of 21.79 mmol g −1 h −1 , which is 7.65 times higher than that of ZIS 6 . The mechanism exploration proves that the formation of NiO/ZIS 6 p-n heterojunction effectively promotes the separation and migration of photoinduced electrons and holes. Meanwhile, the recombination of charge carriers was restrained observably. This work may shed light on the design and preparation of novel p-n heterojunction photocatalysts with efficient photocatalytic hydrogen evolution performance and high stability.
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