JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 40
·19075-19087
·
IF 3.5
Tong Yifan,Liu Linxiang,Chen Zehong,Zhong Linxin
Hydrophobic, elastic, and conductive (HEC) aerogels have significant potential in electronic devices. Herein, we propose a new method to fabricate an HEC aerogel with excellent mechanical and sensing performances from TEMPO-oxidized bacterial cellulose (O-BC) and conductive MXene nanosheets via directional freeze-drying and silanization modification. O-BC with a high aspect ratio can interweave with each other to form continuous layers, while MXene can induce a regular and flat structure and provide good conductivity. The silanization modification ensures high hydrophobicity and high elasticity, which can prevent the aerogel from structural collapse by avoiding adhesion among lamellae. The resulting aerogel can withstand compressive strain high up to 90% and long-term compression for 10,000 cycles at 50% strain due to the elastic and hydrophobic lamellar structure. It also offers a precise electrical response to stress signals in a broad detection range of 0–40 kPa and can accurately detect biological signals from humans. These structural and mechanical performance benefits make the HEC aerogel valuable in the field of pressure sensing.
研究领域:
材料科学
·
电子工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2018
·
IF 4.946
Jianxia Sun,Haixia Luo,Xinghua Li,Xusheng Li,Yeyu Lu,Weibin Bai
Pyranoanthocyanins are anthocyanin derivatives that are formed during fermentation and oxygenation processes in aged wine. They play a critical role in assessing the aging of wine based on its colour quality. Naturally, the formation process of pyranoanthocyanins is fairly slow. In this respect, the present work studies the role and efficiency of ultrasonic treatment in accelerating the formation of methylpyranocyanidin-3- O -glucoside and investigates the spectral characteristics as well as the stability of this derivative toward heat, bisulfite bleaching and pH variation in a simulation system. Our results showed that the yield of methylpyranocyanidin-3- O -glucoside can be increased by 32.5% by ultrasonic treatment at 100 W for 40 min, and excessive treatment (≥60 min) does not have a positive effect on the yield. Moreover, this derivative exhibits a better stability toward heat, pH variation and bisulfite bleaching than its precursor cyanidin-3- O -glucoside.
研究领域:
食品科学
·
化学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-16
·
IF 14.7
Cao Shiyang,Wang Tong,Ren Yifan,Wu Gengshan,Zhang Yuan,Tan Yafang,Zhou Yazhou,Chen Hongyan,Zhang Yu,Song Yajun,Yang Ruifu,Du Zongmin
Post-translational addition of O-linked N-acetylglucosamine (O-GlcNAc) to proteins is commonly associated with a variety of stress responses and cellular processes in eukaryotes, but its potential roles in bacteria are unclear. Here, we show that protein HmwC acts as an O-GlcNAc transferase (OGT) responsible for O-GlcNAcylation of multiple proteins in Yersinia pestis , a flea-borne pathogen responsible for plague. We identify 64 O-GlcNAcylated proteins (comprising 65 sites) with differential abundance under conditions mimicking the mammalian host (Mh) and flea vector (Fv) environments. Deletion of hmwC , encoding a putative OGT, structurally distinct from any existing member of the GT41 family, results in reduced O-GlcNAcylation, reduced growth, and alterations in virulence properties and survival under stress. Purified HmwC can modify target proteins in vitro using UDP-GlcNAc as sugar donor. One of the target proteins, OsdY, promotes Y. pestis survival under oxidative stress conditions. Thus, our results support that regulation of antioxidative responses through O-GlcNAcylation may be a conserved process shared by prokaryotes and eukaryotes.
研究领域:
微生物学
·
病理学
·
分子生物学
·
传染病学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 50
·期 3
·1060-1068
·
IF 4.174
Run-Ze Yuan,Peng-Fei Cui,Shu-Ting Guo,Guo-Xin Jin
Herein, we describe the synthesis of tetraphenylphosphonium o-carboranyl dithiocarboxylate (Ligand 1) and methyldithiocarboxyl-o-carborane (Ligand 2). The complexes [Cp*M(o-C2B10H11CS2)Cl] (M = Ir (3); Rh (4)) and [Cp*M(o-C2B10H11CS2)2] (M = Ir (5); Rh (6)) have been synthesized based on Ligand 1. The selective B–H bond activation of Ligand 2 has also been explored, leading to the synthesis of the B–H activated complex [Cp*Ir(o-C2B10H10CS2CH3)Cl] (7) and four of its substituted derivatives (8, 9, 10 and 11). All of these compounds have been characterised through single-crystal X-ray diffraction, NMR, IR spectroscopy and elemental analysis.
研究领域:
无机化学
·
配位化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Na Li,Xueyan Wu,Yan Lv,Jinxia Chi,Jixi Guo
Fluoranthenes, an important subclass of polycyclic aromatic hydrocarbons, have continued to attract considerable attention in the fields of synthetic organic chemistry and materials science. However, due to the strong π–π intermolecular interactions resulting from highly planar π–π conjugated structures, they usually suffer from aggregation caused quenching (ACQ) in the solid state, which limits their further applications. In this study, SOF and DOF are synthesized via a modified nickel-catalyzed Kumada coupling reaction using o-carborane with three-dimensional clusters and 3-bromofluoranthene as the starting materials. The structural characteristics, luminescence properties, and stimuli-responsive behavior of these compounds are systematically investigated through single crystal structure analysis, UV-vis absorption spectroscopy, fluorescence spectroscopy, and DFT theoretical calculations. For SOF, the formation of excimers is identified as the primary cause of thermochromism. The DOF exhibits excellent properties of aggregation-induced emission (AIE) and quantum yields as high as 18.75% in the solid state. Additionally, the transformation from crystalline to amorphous is the primary reason for the significant mechanochromism of DOF. The nearly perpendicular packing is beneficial for thermochromism, while the anti-parallel packing is likely to cause mechanochromism. These results suggest that o-carborane can play a distinctive role in precisely regulating the emission properties and stimulus response.
研究领域:
有机化学
·
材料科学
·
理论计算
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 29
·2310563
·
IF 13
Pengfei Li,Shanshan Xue,Lu Sun,Xiaobao Ma,Wenning Liu,Li An,Yichang Liu,Dan Qu,Zaicheng Sun
Carbon dots (CDs) have received considerable attention in many application areas owing to their unique optical properties and potential applications; however, the fluorescent mechanism is an obstacle to their applications. Herein, three-color emissive CDs are prepared from single o -phenylenediamine (oPD) by regulating the ratio of ethanol and dimethylformamide (DMF). Fluorescent mechanism of these CDs is proposed as molecular state fluorescence. Reaction intermediates are identified using liquid chromatrography–mass spectroscopy (LC–MS) and 1 H nuclear magnetic resonance (NMR) spectra. 1H-Benzo[d]imidazole (BI), 2,3-diaminophenazine (DAP), and 5,14-dihydroquinoxalino[2,3-b] phenazine (DHQP) are proposed to be the fluorophores of blue, green, and red emissive CDs by comparing their optical properties. As per the LC–MS and 1 H-NMR analysis, DHQP with red emission tends to form from DAP and oPD in pure ethanol. By adding DMF, BI formation is enhanced and DHQP formation is suppressed. The prepared CDs exhibit green emission with DAP. When the DMF amount is >50%, BI formation is considerably promoted, resulting in DAP formation being suppressed. BI with blue emission then turns into the fluorophore of CDs. This result provides us an improved understanding of the fluorescent mechanism of oPD-based CDs, which guides us in designing the structure and optical properties of CDs.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yee-Shin Chang,Cheng-Xin You,Tai-Chen Kuo
In this study, SrY₂O₄:Dy³⁺ phosphors were synthesized using the solid-state reaction method and evaluated after heat treatment at 1300 °C for 5 h. XRD analysis confirmed the orthorhombic structure of SrY₂O₄ with residual Y₂O₃ present. The addition of Dy³⁺ ions caused lattice expansion, impacting grain size and crystallinity. SEM images showed that the phosphor particles had irregular shapes with minimal size variation, although they tended to agglomerate due to high-temperature heat treatment. Optical analysis revealed significant absorption and emission peaks, with a strong excitation band in the 200–306 nm range and prominent sharp peaks in the 306–480 nm range, particularly at a 0.5 mol% doping concentration. Emission spectra indicated the highest intensity at 0.5 mol% Dy³⁺ concentration, with intensity decreasing due to concentration quenching at higher levels. Thermal stability tests showed peak emission intensity at 70 °C, with stability maintained up to 190 °C before notable thermal quenching. Chromaticity coordinates remained within the warm white region at both temperatures. This study provides detailed insights into the effects of Dy³⁺ doping on the structural, optical, and thermal properties of SrY₂O₄ phosphors. Compared to previous studies on rare-earth-doped SrY₂O₄ phosphors, this work is the first to systematically explore the substitution of Y³⁺ ions with Dy³⁺ ions until full replacement. The study not only confirmed that the highest emission intensity occurs at 0.5 mol% Dy³⁺ concentration, but also demonstrated that Dy³⁺-doped SrY₂O₄ phosphors exhibit excellent thermal stability, with emission stability maintained below 150 °C. These findings expand the potential applications of Dy³⁺-doped SrY₂O₄ phosphors, particularly in high-temperature environments and solid-state lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2011
·
IF 1.599
Bin Peng,Yong Nie,Jinling Miao,Zhenwei Zhang,Meiling Xu,Guoxin Sun
The reaction of o -carboranyllithium with two equiv. of 2-pyridinecarboxaldehyde affords 1-[(hydroxy)(pyridyl)methyl]- o -carborane ( 1 ) and 1,2-bis[(hydroxy)(pyridyl)methyl]- o -carborane ( 2 ), which have been characterized by IR and NMR spectroscopy, mass spectrometry and single-crystal X-ray diffraction. Compound 2 exhibits interesting polymorphism (monoclinic 2a and triclinic 2b ). The solid state structures of the new carboranes feature intermolecular and intramolecular hydrogen bonding interactions involving all the N and O atoms, leading to one dimensional ( 1 , 2b ) or two-dimensional ( 2a ) supramolecular structures. The photoluminescence of 1 and 2b was investigated in the solid and solution states at room temperature, respectively.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Shaojie Mo,Ang Xu,Mo Li,Zhongyang Zheng,Youwei Yan,Xinyun Wang,Heping Li
Hydrogen embrittlement in metals seriously threatens the safe and durable operation of hydrogen energy. Developing efficient and robust hydrogen barriers is a viable solution to solve this issue but remains a significant challenge. An amorphous (ErAlCrZrTi)O high-entropy nanofilm is successfully fabricated via sol-gel on steel and identified as highly efficient and robust hydrogen barrier. At 270 nm thickness, the nanofilm achieves ultra-low hydrogen permeability of 1.35 × 10 −15 mol m −1 s −1 Pa −0.5 , enhancing hydrogen resistance by 2738 times at 500 °C compared with that of bare steel. Compared to Er 2 O 3 , Al 2 O 3 , Cr 2 O 3 , and ZrO 2 , it improves hydrogen resistance by 5, 11, 26, and 90 times, respectively. Moreover, such a high hydrogen resistance can be satisfyingly retained even after the (ErAlCrZrTi)O nanofilm suffering 10 dpa irradiation. The nanofilm exhibits 37 MPa bonding strength and exceptional thermal shock resistance, attributed to the formation of Cr₂O₃ transition layer via precipitation and oxidation of Cr from the substrate during annealing. It strengthens adhesion and alleviates thermal expansion mismatch with the substrate. The mechanism for the high barrier efficiency is further revealed by this theoretical calculations. These results provide tremendous insights on the understanding and future design of high-performance hydrogen barriers for hydrogen embrittlement prevention.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2016
·
IF 3.138
Hongli Liu,Xiaoli Liu,Lin Yue,Qixing Jiang,Wenshui Xia
N , O -Carbonylated chitosan derivative (NTCS) was synthesized via oxidation and substitution reaction, respectively. The carboxyethylation of the polysaccharide was identified by Fourier transform infrared (FTIR), 1 H nuclear magnetic resonance (NMR), X-ray diffraction analysis (XRD), Zeta potential measurement and Thermogravimetric analysis (TGA). It is revealed that compared with chitosan (CS), NTCS exhibited an excellent solubility in distilled water, high in vitro bile acid binding capacity, as well as a low viscosity. The in vitro bile acid binding capacity reached 17.21 mg/g, which was 4.5-fold higher than that of CS. The results suggest that NTCS may be useful as a potential functional food supplement in food industry or a key ingredient in the pharmaceutical industry. These findings provide important supports for developing new food additive, and expand the scope of application of CS in the food industry.
研究领域:
食品科学
·
生物化学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Bijie Wang,Yujie Song,Xiao Zhang,Ke Chen,Ming Liu,Xiao Hu,Liu He,Qing Huang
SiBCN ceramics have excellent high-temperature stability and anti-oxidation properties, and they are candidates for materials used at extreme conditions. In this paper, amorphous SiBCN(O) ceramics were obtained through pyrolysis of cross-linked polyborosilazanes. The element content could be readily tuned through adjusting the structures of polymer precursors. The cerminization process and microstructure evolution process were systematically investigated. The SiBCN(O) ceramics remain amorphous below 1400 °C. The carbothermal reduction was suppressed because of the presence of boron. The SiBCN(O) ceramics showed 95.7% and 99.2% carbon residual in argon and air at 1600 °C, indicating high-temperature stability and good anti-oxidation properties. These SiBCN(O) precursors/ceramics could be potentially used in composites or protective coatings for harsh environments.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Heliyon
·
2023
·
IF 4
Liangliang Shi,Chenyue Jia,Jiangtao Feng,Weinong Zhang,Junbo He
1- O -alkylglycerols are a class of natural existing lipids with broad biological activities. However, their use in food or agricultural fields remains to be investigated, especially for their antimicrobial activity. In this work, three 1- O -alkylglycerols, 1- O -octanylglycerol (C 8 Gly 1 ), 1- O -dodecylglycerol (C 12 Gly 1 ), and 1- O -hexadecylglycerol (C 16 Gly 1 ), were synthesized in the isolated yields of 71.3–89.8 % and characterized by 1 H NMR, 13 C NMR, FITR, mass spectra, and HPLC-ESLD. The critical micelle concentration (CMC) of 1- O -alkylglycerols was determined to be 1.65 mmol/L (C 8 Gly 1 ), 0.33 mmol/L (C 12 Gly 1 ), and 0.23 mmol/L (C 16 Gly 1 ) using the pyrene method. C 12 Gly 1 and C 16 Gly 1 had similar surface tensions that are lower than C 8 Gly 1 . C 8 Gly 1 can form micelles in aqueous solution with excellent nano-dispersed uniformity and stability. Furthermore, C 8 Gly 1 and C 12 Gly 1 not only displayed good antibacterial activity against Staphylococcus aureus , but they also inhibited the growth of Botryosphaeria dothidea , Monilia fructigena , and Phytophthora capsicum at 400 μg/mL. Thus, the C 8 Gly 1 and C 12 Gly 1 can serve as novel antimicrobial agents in food preservation.
研究领域:
食品科学
·
微生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）