CELLULOSE
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2019
·Vol. 26
·期 16
·8813-8827
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IF 3.917
Wang Ying,Xiao Guifa,Peng Yangyang,Chen Liheng,Fu Shiyu
Abstract A self-healing hydrogel containing acylhydrazone bond and disulfide bond with pH and redox dual responses was prepared by crosslinking dialdehyde carboxymethyl cellulose (DCMC) with 3,3′-dithiobis(propionohydrazide) (DTP). The pH, gelator concentration and oxidation degree of DCMC affected the formation of DCMC-based self-healing hydrogels seriously. Interestingly, addition of cellulose nanofibers (CNFs) improved the mechanical property of the DCMC-based self-healing hydrogel and its efficiency. When 1.0 wt% CNFs was added in hydrogel preparation, the compressive strength (1.05 MPa) of the composite hydrogel increased by 275% and its strain rose to 74.6%. The healing rate of hydrogel containing 1.0 wt% CNFs was 82.7% at 0.5 h and 89.9% at 1 h, which was much faster than that of original hydrogel (51.6% at 0.5 h and 58.5% in 1 h). DCMC-based dual responsive self-healing hydrogel showed good biocompatibility confirmed by cytotoxicity test, which is potential to implement in medial field. Graphic abstract
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Nature Communications
·
2019
·Vol. 10
·期 1
·1-8
·
IF 11.878
Guan Daqin,Zhou Jing,Huang Yu-Cheng,Dong Chung-Li,Wang Jian-Qiang,Zhou Wei,Shao Zongping
Facile and reliable screening of cost-effective, high-performance and scalable electrocatalysts is key for energy conversion technologies such as water splitting. ABO 3- δ perovskites, with rich constitutions and structures, have never been designed via activity descriptors for critical hydrogen evolution reaction (HER). Here, we apply coordination rationales to introduce A-site ionic electronegativity (AIE) as an efficient unifying descriptor to predict the HER activities of 13 cobalt-based perovskites. Compared with A-site structural or thermodynamic parameter, AIE endows the HER activity with the best volcano trend. (Gd 0.5 La 0.5 )BaCo 2 O 5.5+ δ predicted from an AIE value of ~2.33 exceeds the state-of-the-art Pt/C catalyst in electrode activity and stability. X-ray absorption and computational studies reveal that the peak HER activities at a moderate AIE value of ~2.33 can be associated with the optimal electronic states of active B-sites via inductive effect in perovskite structure (~200 nm depth), including Co valence, Co-O bond covalency, band gap and O 2 p -band position.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 15
·14528-14537
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IF 2.195
Zeng Yuan,Li Zhicheng,Shao Junming,Wang Xianchi,Hao Wenbin,Zhang Hong
Cu/Nb doped YFeO 3 ceramics were synthesized through wet chemical method followed by traditional ceramic sintering technology. The phase component and electrical properties of the ceramics were investigated. The XRD pattern shows that all the prepared ceramics have the orthorhombic perovskite structure with space group of P nma . The XPS analysis demonstrates the existence of Fe 2+ and Fe 3+ in the ceramics. The temperature dependence of resistivity indicates that YFeO 3 -based materials have a characteristics of negative temperature coefficient (NTC) of resistivity. The room temperature resistivities (306–1.52 × 10 5 Ω cm) and temperature sensitivity B values (2693–5395 K) can be effectively adjusted by changing the contents of Cu- and Nb- ions. According to the analysis of complex impedance spectra at various temperatures, the NTC characteristic could be attributed to grain effect and grain boundary effect. The possible conduction mechanisms are propose to hopping conduction and band conduction in grain, and thermal activation transport of charge carries in grain boundary.
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Scientific Reports
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2017
·Vol. 7
·期 1
·1-11
·
IF 4.259
Huang Haiying,Tao Xuanyu,Jiang Yiming,Khan Aman,Wu Qi,Yu Xuan,Wu Dan,Chen Yong,Ling Zhenmin,Liu Pu,Li Xiangkai
Soil contamination by PAH and heavy metals is a growing problem. Here, we showed that a new isolate, Pseudomonas brassicacearum strain LZ-4, can simultaneously degrade 98% of 6 mM naphthalene and reduce 92.4% of 500 μM hexavalent chromium [Cr (VI)] within 68 h. A draft genome sequence of strain LZ-4 (6,219,082 bp) revealed all the genes in the naphthalene catabolic pathway and some known Cr (VI) reductases. Interestingly, genes encoding naphthalene pathway components were upregulated in the presence of Cr (VI), and Cr (VI) reduction was elevated in the presence of naphthalene. We cloned and expressed these naphthalene catabolic genes and tested for Cr (VI) reduction, and found that NahG reduced 79% of 100 μM Cr (VI) in 5 minutes. Additionally, an nahG deletion mutant lost 52% of its Cr (VI) reduction ability compared to that of the wild-type strain. As nahG encodes a salicylate hydroxylase with flavin adenine dinucleotide (FAD) as a cofactor for electron transfer, Cr (VI) could obtain electrons from NADH through NahG-associated FAD. To the best of our knowledge, this is the first report of a protein involved in a PAH-degradation pathway that can reduce heavy metals, which provides new insights into heavy metal-PAH contamination remediation.
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PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
·
2024
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IF 2.7
Sheng Yumiao,Xu Kedian,Wang Zhenzhen,Gao Yunling
A new ratiometric and colorimetric fluorescent probe HTD was synthesized based on the reaction of 4-aminophenyl boronic acid pinacol ester and 4-(3-formyl-4-hydroxyphenyl) benzonitrile. The probe exhibited a unique fluorescence response to hypochlorous acid and had good anti-interference performance in the presence of other interference. When HTD met the NaClO, the light orange fluorescence was changed to green with the blue-shifted emission wavelength from 550 to 500 nm. Moreover, the absorbance of HTD’s UV–vis at 300 nm and 375 nm decreased in the presence of NaClO. The limit of detection was 1.83 × 10 –7 M and 2.96 × 10 –6 M based on the fluorescence and UV–vis titration data. NMR, HRMS, and IR spectra suggested that the possible sensing mechanism of HTD to NaClO was the formation of initial compound 4-(3-formyl-4-hydroxyphenyl) benzonitrile due to the oxidation of hypochlorous acid in aqueous solution. The portable test strips were obtained, and the real water sample test reached good results with spiking recoveries among 92.00% ~ 103.25%. Finally, endogenous hypochlorous acid produced by LPS and PMA was successfully detected by HTD in living mice using in situ fluorescence bioimaging. Graphical abstract
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Yin Shuhu,Chen Long,Yang Jian,Cheng Xiaoyang,Zeng Hongbin,Hong Yuhao,Huang Huan,Kuai Xiaoxiao,Lin Yangu,Huang Rui,Jiang Yanxia,Sun Shigang
Replacement of expensive and rare platinum with metal–nitrogen–carbon catalysts for oxygen reduction reactions in proton exchange membrane fuel cells is hindered by their inferior activity. Herein, we report a highly active iron-nitrogen-carbon catalyst by optimizing the carbon structure and coordination environments of Fe-N 4 sites. A critical high-temperature treatment with ammonium chloride and ammonium bromide not only enhances the intrinsic activity and density of Fe-N 4 sites, but also introduces numerous defects, trace Br ions and creates mesopores in the carbon framework. Notably, surface Br ions significantly improve the interaction between the ionomer and catalyst particles, promoting ionomer infiltration and optimizing the O 2 transport and charge transfer at triple-phase boundary. This catalyst delivers a high peak power density of 1.86 W cm −2 and 54 mA cm −2 at 0.9 V iR-free in a H 2 -O 2 fuel cells at 80 °C. Our findings highlight the critical role of interface microenvironment regulation.
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Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-19
·
IF 36.3
Wang Peng,Wang Guoqing,Sun Guifen,Bao Chenchen,Li Yang,Meng Chuizhou,Yao Zhao
A flexible multimodal proximity–pressure–temperature sensing patch with a simple structure was developed.
Thanks to structural design and material synthesis, the sensor has an outstanding temperature sensitivity of 0.5 °C −1 with good linearity, a high pressure sensitivity of 30.6 kPa −1 and a non-contact sensing range is 2 m.
After the multimodal sensing patches are integrated at different locations of the pillow, the sleeping conditions can be monitored comfortably.
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Journal of Inorganic and Organometallic Polymers and Materials
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2024
·
IF 3.9
Pei Xiu,Bai Jinchuan,Li Yaming,Kong Xiangbo
In this paper, a luminescent metal-organic framework Tb 3+ @tartaric acid-functionalized Zr-MOF (Tb 3+ @UiO-67-bpy-TA, TA = tartaric acid) was prepared by post-synthetic modification (PSM) and used as a fluorescence sensor for the detection of the pesticide nitenpyram (NTP). The fluorescence sensing experiment verified that Tb 3+ @UiO-67-bpy-TA had exceptional sensitivity and selectivity for NTP detection, and the detection limit was calculated to be as low as 1.28 µM. The mechanism studies indicated that competitive UV absorption, photoinduced electron transfer (PET) and dynamic quenching contributed to the fluorescence quenching process. In addition, the detection of NTP in tap water and Yellow River water samples by the Tb 3+ @UiO-67-bpy-TA were also investigated using standard addition method, and satisfactory recoveries were achieved.
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JOURNAL OF FLUORESCENCE
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2025
·
IF 3.1
Yan Zitao,Zhu Dachuan
A series of dual-lanthanide metal–organic frameworks (MOFs: Dy 1-x Ce x -BTC) have been successfully prepared by hydrothermal method using dysprosium (Dy 3+ ) and cerium (Ce 3+ ) ions as metal sources and 1,3,5-benzenetricarboxylic acid (H 3 BTC) as organic ligand, confirmed by XRD patterns and FT-IR spectra, and then the luminescence property, the application in detecting small organic molecules and structural stability have been discussed. Among the samples, Dy 0.8 Ce 0.2 -BTC exhibited two strongest emission peaks located at 485 nm and 578 nm under the excitation at 295 nm, which are attributed to the excited electronic transitions of Dy 3+ from 4 F 9/2 to 6 H 15/2 and 6 H 13/2 . However, Dy 0.8 Ce 0.2 -BTC immersed in the solution of acetaldehyde (AH) demonstrated an obvious luminescence quenching with the calculated quenching constant ( K sv ) and the limit of detection ( LOD ) as 7.08 × 10 3 M −1 , 5.36 × 10 –7 M and high selectivity among the other tested organic solvents. Meanwhile, it revealed that the MOF could maintain good microstructural and recycle stability in deionized water, indicating a great potential as a turn-off fluorescent sensor for AH detection. Besides, the luminescence quenching mechanism was deduced from competitive absorption.
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Food Production Processing and Nutrition
·
2024
·Vol. 6
·期 1
·1-17
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IF 4
Sun Yujiao,Li Baobao,Xue Yuanye,Wang Jiankang,Miao Bingbing,Liu Yang,Li Yanjun,Cao Yungang,Chang Dawei
Stipes are the major waste from the processing of Lentinus edodes . To make full use of L. edodes stipes (LES), different fractions of LES polysaccharides (LESPs) were first obtained by water extraction and gradient ethanol precipitation. Afterwards, the LES residues were treated with an optimal combination of Aspergillus niger and Saccharomyces cerevisiae for the preparation of soluble/insoluble dietary fibers (LESS/LESI) using the response surface methodology and the Box-Behnken design. Subsequently, the in vitro immunomodulatory activity of LESPs and LESS, as well as the adsorption capacities of LESI were evaluated. The results showed that LESPs were neutral polysaccharides, mainly containing glucose. The optimal parameters for modifying the residues of LES were the followings: 4% ( w / w ) A. niger , 8% ( w / w ) S. cerevisiae , 31 ℃, 3 d, and a solid–liquid ratio of 1:12.5 in a yield of 14.73%/82.45% of LESS/LESI, respectively. The in vitro immunomodulatory activity assays revealed that LESPs and LESS had potent immunostimulatory activity to increase phagocytosis, acid phosphatase activity and nitric oxide production of RAW264.7 murine cell macrophages. The evaluation of adsorption capacities revealed that LESI owned stronger water holding capacity, oil holding capacity and water swelling capacity. This research could provide an effective way to fully utilize discarded L. edodes stipes with high added-value. Graphical Abstract An effective strategy was built to fully utilize discarded L. edodes stipes by preparing polysaccharides (LESPs-20, LESPs-50 and LESPs-80), soluble and insoluble dietary fibers (LESS/LESI). Their products showed immunomodulatory activity and adsorption capacities.
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JOURNAL OF MATERIALS SCIENCE
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2024
·Vol. 59
·期 16
·6765-6777
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IF 3.5
Li Yichao,Sun Ao,Hu Xiafen,Wu Dan,Hao Lei,Yan Youwei,Xi Zhaojun
Out-of-oven curing of epoxy resins with economical and energy-efficient techniques is vital for manufacturing advanced composite structures. In this study, the effects of a magnetic particle (MP)-induced in situ heating technique on the heating temperatures and mechanical properties of epoxy resins were investigated. The results showed that the proposed technique quickly increased the epoxy resin temperature and steadily heated the polymer until it was fully cured. With increasing MP concentrations from 6 wt% to 22 wt%, a notable increase in the heating ratio from 3.27 °C/min to 8.96 °C/min and steady increases in the heating temperature from 92.61 °C to 115.03 °C were observed. Surface modification of the MPs improved the homogeneity of the heating field and cross-linking and also increased the heating ratio and steady heating temperature. With merely 2.5 h of induction heating, the flexural moduli and strengths of functionalized MP/epoxy samples with MP loads of 6 wt%, 13 wt% and 22 wt% were 45.1%, 42.8%, 40.5% and 6.3%, 33.5%, 39.4% higher than those of oven-cured control samples. These findings provide essential knowledge for fabricating advanced polymeric composite structures without an oven.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 4
·1-14
·
IF 5.3
Chen Haihong,Ma Miaoxia,Zhang Lingyi,Wang Zhengduo,Sun Haofan,Liu Chenyu,Zhang Lixin,Zhang Weibing
A material-based strategy was developed to achieve the simultaneous purification and isolation of exosomes from serum and urine. Based on the combination of electrostatic interaction and hydrophobic interaction, polyacrylic acid (PAA)–coated anionic nanoparticles (Fe 3 O 4 @PAA) were used to remove positively charged contaminant proteins and neutral proteins, and polyethyleneimine (PEI)-functionalized cationic nanoparticles (Fe 3 O 4 @PEI) were applied to remove negatively charged contaminant proteins as well as capture and mild release of negatively charged exosome. By employing this strategy (denoted as PAA-PEI), a high recovery (> 95%) of serum exosomes was achieved with a high removal efficiency of protein contaminants (87%). The strategy was further applied to purify and isolate urinary exosomes, followed by downstream proteomics analysis. Compared with the standard isolation method of ultracentrifugation (UC), the PAA-PEI strategy shows high contaminant protein removal efficiency (98.6%) and obtains a higher concentration of exosomes. Using the PAA-PEI strategy, more urinary exosomal proteins (124) than UC (92) were identified. These results indicate that the PAA-PEI strategy is not only excellent in exosome capture but also effectively mitigates the interference of protein contamination. Given that the PAA-PEI strategy demonstrates a high protein contaminant removal efficiency and requires less cost and time (1 h) than UC (3 h), it would be a promising candidate method for efficiently purifying and isolating exosomes from complex biological samples for early discovery and diagnosis diseases. Furthermore, this study provides a new direction for emphasizing the issue of protein interference in the development of biological sample isolation methods. Graphical
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