SmartMat
·
2023
·
IF 20.4
Yushan Yang,Kaicong Chen,Yipeng Chen,Chao Wang,Baokang Dang,Yingying Li,Ming Liu,Qingfeng Sun
Combination of flexible multifunctional stealth technology properties such as electromagnetic (EM) and infrared (IR) stealth is crucial to the development of aerospace, military, and electronic fields, but the synthesis technology still has a significant challenge. Herein, we have successfully designed and synthesized highly flexible MXene@cellulose lamellae/borate ion (MXCB) sheets with strong high-temperature EM-IR bi-stealth through sequential bridging of hydrogen and covalent bonds. The resultant MXCB sheets display high conductivity and good mechanical features such as flexibility, stretchability, fatigue resistance, and ultrasonic damage. MXCB sheets have a high tensile strength of 795 MPa. Furthermore, MXCB sheets with different thicknesses indicate exceptional high-temperature thermal-camouflage characteristics. This reduces the radiation temperature of the target object (>300°C) to 100°C. The conductivity of MXCB sheet with 3 μm thickness is 6108 S/cm and the EM interference (EMI) shielding value is 39.74 dB. The normalized surface-specific EMI SE absolute shielding effectiveness (SSE/ t ) is as high as 39312.78 dB·cm 2 /g, which remained 99.39% even after 10,000 times repeated folding. These multifunctional ultrathin MXCB sheets can be arranged by vacuum-assisted induction to develop EM-IR bi-stealth sheet.
研究领域:
材料科学
·
航空航天工程
·
电子工程
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产品关联
DOI
高影响因子
ChemPlusChem
·
2023
·Vol. 88
·期 6
·e202300138
·
IF 3.4
Hongyu Guo,Jiaqiao Yang,Jian Zeng,Xiaoqi Yu,Shanshan Yu,Lin Pu
Graphical The first near IR fluorescent probe for the chemoselective and enantioselective recognition of arginine in aqueous solution is reported in this work. This probe also allows visual discrimination of the arginine enantiomers because of its fast and distinct color change upon interaction with the substrate. The first near IR fluorescent probe for the chemoselective and enantioselective recognition of arginine in aqueous solution is reported in this work. This probe, made of a 1,1’-binaphthyl-based chiral aldehyde unit and a rhodamine-based near IR chromophore, in combination with La 3+ exhibits highly chemoselective as well as enantioselective fluorescent enhancement with arginine at λ=764 nm upon excitation at λ=690 nm. Little or no fluorescent response is observed toward the chirality miss-matched arginine enantiomer or other common amino acids and their enantiomers. This probe also allows visual discrimination of the arginine enantiomers because of its fast and distinct color change upon interaction with the substrate.
研究领域:
生物化学
·
分析化学
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DOI
PubMed
高影响因子
BIOINORGANIC CHEMISTRY AND APPLICATIONS
·
2023
·
IF 3.8
Jingfang Song,Jian He,Lin Yang,Weiguo Wang,Qinqin Bai,Wei Feng,Ranhui Li
To inhibit the growth of bacteria, the DA-PPI nanozyme with enhanced peroxidase-like activity was synthesized. The DA-PPI nanozyme was obtained by depositing high-affinity element iridium (Ir) on the surface of Pd-Pt dendritic structures. The morphology and composition of DA-PPI nanozyme were characterized using SEM, TEM, and XPS. The kinetic results showed that the DA-PPI nanozyme possessed a higher peroxidase-like activity than that of Pd-Pt dendritic structures. The PL, ESR, and DFT were employed to explain the high peroxidase activity. As a proof of concept, the DA-PPI nanozyme could effectively inhibit E. coli (G−) and S. aureus (G+) due to its high peroxidase-like activity. The study provides a new idea for the design of high active nanozymes and their application in the field of antibacterial.
研究领域:
生物化学
·
材料科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Baoxuan Huang,Chen Zhang,Jia Tian,Qiwei Tian,Gang Huang,Weian Zhang
The long-standing misuse of antibiotics has accelerated the emergence of drug-resistant bacteria, which gives rise to an urgent public health threat. Antibacterial photodynamic therapy (aPDT), as a burgeoning and promising antibacterial strategy, plays an essential role in avoiding the evolution of drug-resistant microbes. However, it is hard for conventional photosensitizers to achieve satisfactory antibacterial efficacy because of the complex bacterial infectious microenvironment (BIME). Herein, a cascade BIME-triggered near-infrared cyanine (HA-CY) nanoplatform has been developed via conjugating cyanine units to biocompatible hyaluronic acid (HA) for enhanced aPDT efficacy. The HA-CY nanoparticles can be dissociated under the overexpressed hyaluronidase in BIME to release a cyanine photosensitizer. Meanwhile, cyanine can be protonated under acidic BIME, where protonated cyanine can efficiently adhere to the surface of a negatively charged bacterial membrane and increase singlet oxygen production due to intramolecular charge transfer (ICT). Experiments in the cellular level and animal model proved that the BIME-triggered activation of aPDT could remarkably boost aPDT efficacy. Overall, this BIME-triggered HA-CY nanoplatform presents great promise for overcoming the dilemma of drug-resistant microbes.
研究领域:
生物医学工程
·
微生物学
·
纳米医学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 4
·2248-2255
·
IF 3.9
Mingze Li,Yundong Zhang,Jinli Ma,Jianshi Du
The lymphatic system is a complex network of lymphatic vessels, lymph nodes, and lymphoid organs. The current understanding of the basic mechanism and framework of the lymphatic system is relatively limited and not ideal for exploring the function of the lymphatic system, diagnosing lymphatic system diseases, and controlling tumor metastasis. Imaging modalities for evaluating lymphatic system diseases mainly include lymphatic angiography, reactive dye lymphatic angiography, radionuclide lymphatic angiography, computed tomography, and ultrasonography. However, these are insufficient for clinical diagnosis. Some novel imaging methods, such as magnetic resonance imaging, positron emission computed tomography, single-photon emission computed tomography, contrast-enhanced ultrasonography, and near-infrared imaging with agents such as cyanine dyes, can reveal lymphatic system information more accurately and in detail. We fabricated an albumin-based fluorescent probe for dual-modality imaging of the lymphatic system. A near-infrared cyanine dye, IR-780, was absorbed into bovine serum albumin (BSA), which was covalently linked to a molecule of diethylenetriaminepentaacetic acid to chelate gadolinium Gd3+. The fabricated IR-780@BSA@Gd3+ nanocomposite demonstrates strong fluorescence and high near-infrared absorption and can be used as a T1 contrast agent for magnetic resonance imaging. In vivo dual-modality fluorescence and magnetic resonance imaging showed that IR-780@BSA@Gd3+ rapidly returned to the heart through the lymphatic circulation after it was injected into the toe webs of mice, facilitating good lymphatic imaging. The successful fabrication of the new IR-780@BSA@Gd3+ nanocomposite will facilitate the study of the mechanism and morphological structure of the lymphatic system.
研究领域:
医学影像学
·
生物医学工程
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DOI
PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 15
·10390-10396
·
IF 3.9
Bang Li,Guangfu Li,Qiqi Wan,Lei Yuan,Yingying Liu,Longxu Li,Xiaodong Zhuang,Junliang Zhang,Changchun Ke
Proton exchange membrane water electrolysis (PEMWE) is a promising technology for green hydrogen production. However, its large-scale commercial application is limited by its high precious metal loading, because low catalyst loading leads to reduced electron transport channels and decreased water transportation, etc. Herein, we study the electrode level strategy for reducing Ir loading by the optimization of the micro-structure of the anode catalyst layer via SnO2 doping. The pore structure and electron conductive network of the anode catalyst layer can be simultaneously improved by SnO2 doping, under appropriate conditions. Therefore, mass transfer polarization and ohmic polarization of the single cell are reduced. Moreover, the enhanced pore structure and improved electron conduction network collectively contribute to a decreased occurrence of charge transfer polarization. By this strategy, the performance of the single cell with the Ir loading of 1.5 mg cm−2 approaches the single cell with the higher Ir loading of 2.0 mg cm−2, which means that SnO2 doping saves about 25% loading of Ir. This paper provides a perspective at the electrode level to reduce the precious metal loading of the anode in PEMWE.
研究领域:
材料科学
·
能源技术
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DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 2.368
Qing Xu,Jianbo Guo,Chunmei Niu,Jing Lian,Zhenghao Hou,Yankai Guo,Shaoying Li
This study investigated the denitrification characteristics and practical applications of PET–CAs (chloroanthraquinones immobilised on polyethylene terephthalate), which are novel functional biocarriers. The PET–CAs were characterized using Fourier transform infrared spectroscopy (FT-IR) and energy dispersive spectrometry (EDS). Among the PET–CAs, PET-1,8-DCA (PET modified by 1,8-dichloroanthraquinone) was the best functional biocarrier for accelerating the denitrification process with approximately 0.14 mmol anthraquinone. The denitrification process was pseudo-zero order, with C NO3 − = 175.64–19.28 t and R 2 = 0.9715. The pH of the PET-1,8-DCA system increased and ultimately reached 9.7. The stabilized ORP value with PET-1,8-DCA was approximately 70 mV lower than that of the control with PET . This study explored a novel design concept for the immobilization of quinone.
研究领域:
环境生物学
·
微生物学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 22
·18381-18387
·
IF 3.201
Hang Cheong Chan,Ting Chen,Lifang Xie,Yijin Shu,Qingsheng Gao
As promising catalyst supports, hydrogenated metal-oxides can afford engineered surface architectures and electronic configurations to promote catalytic turnover on loading metals. Herein, hydrogenated TiO2 (H-TiO2) fabricated via NaBH4 reduction is successfully introduced to boost the catalytic oxidation of formaldehyde (HCHO), which is one of the most common and harmful indoor volatile organic compounds. Distinct from the parent TiO2, H-TiO2 features enriched surface hydroxyls and enhanced metal–support interactions upon loading Ir, which are responsible for remarkable promotion in HCHO oxidation. In particular, the abundant hydroxyls on H-TiO2 promote the generation of HCOO−, which is believed to be the rate-determining step in HCHO oxidation. This discovery is anticipated to pave the way for exploring high-performance metal catalysts on oxide supports via surface and interfacial engineering.
研究领域:
材料科学
·
催化化学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Xiucheng Sun,Jian Lin,Yuehan Wang,Lin Li,Xiaoli Pan,Yang Su,Xiaodong Wang
Inert substrate supported Ir catalyst for room-temperature oxidation of formaldehyde has never been reported so far. Here, a novel Ir-based catalyst supported on commercial γ-Al 2 O 3 (IrAl-CD), which was synthesized via a modified colloid-deposition method, can realize complete conversion of HCHO at 20 °C for the first time. It exhibits a two-fold higher specific rate than IrAl-DP prepared by a conventional deposition-precipitation method. Detailed characterizations demonstrate that the positive Ir species bonded with OH groups on IrAl-DP make HCHO oxidation follow a reaction pathway between OH and formate intermediates. In contrast, the fairly high content of metallic Ir 0 species on IrAl-CD facilitates the direct dehydrogenation of HCHO to form the dominant intermediates of CO, which are easily oxidized with a lower activation energy. Consequently, the electronic state of Ir determines the extremely high performance even supporting on inert substrate and the reaction mechanism for HCHO oxidation at ambient temperature.
研究领域:
催化化学
·
环境科学
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产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2026
·
IF 3.6
Lin Zhou,Zhanghong Guo,Haining Cui,Jinxin Ma,Chan Wang,Qijun Song
Direct transformation of biomass-derived platform compound 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) represents a highly attractive route with significant environmental and economic benefits. The nanozymes with oxidase-like (OXD-like) activity hold great promise for the green oxidation of HMF to FDCA. Herein, an iridium-coated γ-Fe 2 O 3 core-shell nanozyme (γ-Fe 2 O 3 @Ir) was prepared by the reduction of Ir 3+ with glycerol on the surface of γ-Fe 2 O 3, and the structure of the γ-Fe 2 O 3 @Ir nanozyme was confirmed by XRD, HAADF-STEM image, and elemental line-scan analyses results. The magnetic property of the nanozyme not only facilitates its recovery but also effectively enhances its affinity to oxygen. By employing γ-Fe 2 O 3 @Ir nanozyme as the catalyst and atmospheric oxygen as a green oxidant, a near-quantitative conversion (98.5%) of molar level HMF to FDCA was achieved.
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产品关联
DOI
PubMed
高影响因子
Science China-Materials
·
2026
·Vol. 69
·期 3
·1486-1498
·
IF 7.7
Wu Qiaolin,Liu Xingyu,Cheng Lei,Tang Yawen,Li Yafei,Wang Yu,Sun Hanjun
Construction of metal-mediated redox sites is an appealing approach to enhance photocatalytic CO 2 reduction coupled with H 2 O oxidation. However, conventional static redox sites generally lack spatiotemporal matching during reaction processes due to the constraints of rigid structure and the linear scaling relationship of adsorbed species. Herein, an alkanolamine-Ir synergistic system was developed, where flexible monoethanolamine (MEA) molecules function as molecular ferries to selectively adsorb CO 2 via carbamate formation, while adjacent Ir nanoparticles (NPs) serve as H spillover hubs that relay protons, creating spatiotemporal adaptability that synchronizes CO 2 reduction and water oxidation. In addition, time-resolved in situ spectroscopy directly captures the rapid transformation of carbamate intermediates concurrent with sustained IrOOH intermediates formation. Microkinetic modeling further demonstrates that the MEA-Ir modified system (M-Ir/ACN) creates interconnected H spillover networks between Ir NPs and MEA, facilitating efficient proton transport that drives *COOH formation with a favorable thermodynamic energy. As a result, the M-Ir/ACN achieves a 20-fold increase in CO production compared to the pristine sample while maintaining high stability throughout 45 h of continuous operation. This study presents that flexible molecular ferries boost CO 2 adsorption, and deciphers how flexible molecular-metal synergy directs the trafficking of CO 2 -derived intermediates toward highly efficient CO 2 photoreduction.
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DOI
高影响因子
Advanced Science
·
2021
·Vol. 8
·期 8
·2004044
·
IF 16.806
Peng Xiao,Chunyan Liu,Tiancong Ma,Xiuhong Lu,Lihong Jing,Yi Hou,Peisen Zhang,Gang Huang,Mingyuan Gao
Hypoxia is considered as a key microenvironmental feature of solid tumors. Luminescent transition metal complexes particularly those based on iridium and ruthenium have shown remarkable potentials for constructing sensitive oxygen-sensing probes due to their unique oxygen quenching pathway. However, the low aqueous solubility of these complexes largely retards their sensing applications in biological media. Moreover, it remains difficult so far to use the existing complexes typically possessing only one luminescent domain to quantitatively detect the intratumoral hypoxia degree. Herein, an Ir(III) complex showing red emissions is designed and synthesized, and innovatively encapsulated within a hydrophobic pocket of Cyanine7-modified cyclodextrin. The Ir(III) complex enables the oxygen detection, while the cyclodextrin is used not only for improving the water solubility and suppressing the luminescence quenching effect of the surrounding aqueous media, but also for carrying Cyanine7 to establish a ratiometric oxygen fluorescence probe. 2D nuclear magnetic resonance is carried out to confirm the host–guest structure. The oxygen-responsive ability of the resulting ratiometric probe is evaluated through in vitro cell and multicellular experiments. Further animal studies about tumor oxygen level mapping demonstrate that the probe can be successfully used for quantitatively visualizing tumor hypoxia in vivo.
研究领域:
生物医学工程
·
肿瘤学
·
分析化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）