ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Xu Gao,Ming Hao,Qi Tan,Junxia Wang,Yujing Li,Jitun Chen,Wenbin Sun,Yuxin Li
Electromagnetic waves at the X band (8.2–12.4 GHz) play significant roles in military applications such as radar, satellite, and wireless communication. However, within this band range, the developed performance of electromagnetic absorption (EMA) is still unsatisfied, and it is hard to settle the corresponding problems on radar stealth and electromagnetic pollution. Herein, we demonstrate a state-of-the-art EMA property of −82.6 dB at 8.24 GHz with 2.57 mm thickness and 30 wt % paraffin filling ratio. For this purpose, an optimal Co@NCS/Ti3C2Tx composite is prepared by an electrostatic self-assembly approach through compelling Co-loading of nitrogen-doped carbon sheets (Co@NCS) derived from the pyrolysis of ZIF-67 (CoZn) with 2D Ti3C2Tx MXene nanosheets. Experimental results show that the highly efficient EMA performance of this Co@NCS/Ti3C2Tx composite originates from the large surface area for multiple reflection and electromagnetic wave scattering, from abundant defects sites for dipole and interfacial polarization, and from the optimizing impedance matching by the combination of Co magnetic nanoparticles and conductive NCS/Ti3C2Tx composite. These results confirm that the as-fabricated composites possess scientific and practical values for EMA applications at the X band, paving the way for developing highly performant electromagnetic absorbers toward specific microwave bands.
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高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Xiang Long,Chenglin Wang,Yanshun Ma,Shaogui Wu,Liang Hao
Herein, multiple color (blue, green and red) emissive carbon dots (CDs) were synthesized from the main precursor via different protocols, with emission wavelengths of 439 nm, 528 nm and 623 nm, respectively, realizing the synthesis of fluorescent CDs spanning the fluorescence emission from short to long wavelengths. Their relative PLQYs reach up to 28.9%, 31.4% and 12.3%, respectively, exceeding the PLQYs of many similar CDs. The green CDs (G-CDs) and red CDs (R-CDs) show optimal photoluminescence performance in acetone (Me 2 CO); while the B-CDs have a pH-dependent response in the pH 2 to 12 range. All the three CDs have excellent photostability and salt resistance. Finally, serving as fluorescent anti-counterfeiting ink was taken as an example to briefly introduce the application of multi-color CDs. This work provides a new strategy to develop low-cost multiple color phosphors for display device, biological imaging, analysis and detection and other fields.
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ACS Applied Materials & Interfaces
·
2022
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IF 10.383
Wenyu Guo,Shuo Huang,Jian An,Jiabin Zhang,Feihong Dong,Jie Dang,Jue Zhang
As one of the most valuable endogenous gas signaling molecules, carbon monoxide (CO) has been demonstrated in numerous studies to show excellent promise in the treatment of diseases, such as cancer. However, for many years, the inherent high affinity of CO for hemoglobin severely impeded the clinical transformation of CO-based treatments. Therefore, the controlled delivery of CO to target tissues has become a common challenge. Herein, an efficient ultrasonic-triggered and targeted CO release strategy was constructed based on a novel targeted acoustic release carrier of carbon monoxide (TARC-CO) that we synthesized in this study. The designed TARC-COs could afford a safe, stable, and ultrasound-guided delivery of CO in vivo by loading a specified dose of CO inside microbubbles, resulting in breast tumor suppression. Taking advantage of the high loading capacity of microbubbles, the unit volume of TARC-CO suspension could encapsulate up to 337.1 ± 8.0 (×103 ppm) of CO. In addition, the satisfactory ultrasound contrast-enhanced ability of TARC-COs achieved real-time interactive guidance and visual policing of CO delivery. For the in vitro antitumor study, TARC-COs with ultrasonic irradiation were demonstrated to effectively induce mitochondrial dysfunction by reducing mitochondrial membrane potential, leading to the apoptosis of 4T1 cells. In addition, we realized that TARC-CO-based treatment could significantly slow the growth rate of tumors by inducing apoptosis, inhibiting the proliferation of cancer cells, and limiting tumor angiogenesis. In summary, this proof-of-concept study demonstrates the feasibility and tremendous potential of TARC-COs for controlled release of CO, which can be expected to provide new inspirations and a promising perspective for therapy based on active gases.
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Journal of Materials Research and Technology-JMR&T
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2023
·
IF 6.4
Shiqi Zhu,Yu Gao,Haoran Zhou,Chunlin Zheng,Xubin Li,Qikui Man,Xincai Liu
The development of microwave absorption materials with good environmental adaptability is a hot topic in the electromagnetic protection field. In this research, Expanded graphite (EG)/ZIF-67 nanocubes-derived (Co@C) composites were successfully fabricated by electrostatic assembly and subsequent heat treatment. The results show that the involvement of an appropriate content of Co@C not only overcomes the problem of single EG impedance mismatch but also introduces additional magnetic loss for the absorber. At the thicknesses of 1.6 mm and 1.5 mm, an effective absorption bandwidth (EAB) of 4.52 GHz and a minimum reflection loss (RL min ) of −48.4 dB were achieved for the Z2-700 sample with a low filling ratio (20 wt%). The enhancement of EMW-absorption performance is attributed to the optimization of impedance matching and the synergistic action between multiple loss mechanisms. Electrochemical corrosion test showed that graphite nanoflakes of EG enhanced the transfer resistance during corrosion, and the corrosion resistance of pure Co@C was enhanced with the protection of EG. This work provides a reasonable attempt to design and fabricate efficient microwave absorption materials suitable for harsh environments.
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ACS Applied Nano Materials
·
2022
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IF 6.14
Qiong Zhang,Dewen Xu,Yunfa Si,Renxin Xu,Bailu Luo,Shuangyuan He,Dan Liu
As a recently emerging 2D material, Ti3C2TX MXene, with some distinct characters, might bring opportunities for developing advanced microwave absorption materials (MAMs). Although the multilayered MXene with an accordion-like structure has been used as the building blocks to obtain composite MAMs, the exfoliated MXene (eMXene) nanosheets have rarely been explored. Herein, we construct a hierarchically structured MXene-based composite by simultaneously decorating magnetic nanosheets/particles onto eMXene sheets for an efficient microwave absorption. Systematic ex situ characterizations reveal that the eMXene sheets can act as a structure-directing agent and host to allow an interlaced growth of ultrathin CoO nanosheets and spherical Co@C nanoparticles onto their surfaces. Such structural design impedes the agglomeration of eMXene sheets and magnetic nanounits while guaranteeing the adequate exposure of polar functional groups on MXene surfaces. Meanwhile, the introduction of dual magnetic phases enables an additional magnetic loss capability and also builds massive void spaces and rich heterointerfaces between various nanounits for a significantly enhanced dielectric polarization loss, resulting in a superior impedance matching and attenuation capability. Accordingly, the optimal composite exhibits a minimum reflection loss of −73.4 dB at a thin thickness of 2.1 mm and an effective absorption bandwidth up to 5.6 GHz (12.4–18.0 GHz) at a thin thickness of 1.8 mm. This study might stimulate the further development of exfoliated MXene-based composite microwave absorbers with hierarchical structures.
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CHEMICAL ENGINEERING SCIENCE
·
2022
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IF 4.889
Li Chen,Jinyi Chen,Zhu Sun,Baiheng Wu,Fangfu Ye,Chun-Xia Zhao,Dong Chen
Nanoprecipitation is a flexible method to prepare biocompatible nanoparticles (NPs) for drug delivery and so on. However, it is generally hard to co-precipitate multiple polymers due to their different solvent solubility. Here, shellac/PLA/PS trimer NPs are prepared for the first time via one-step co-precipitation upon rapid solvent exchange and controlled phase separation. The morphology of shellac/PLA/PS NPs strongly depends on the interfacial tensions between different phases and could be tuned by the molecular surfactant added in the continuous aqueous phase. Since co-precipitation is a fast process, a high temperature is preferred for the system to reach the thermal equilibrium state; otherwise, the system may kinetically be locked in an intermediate state. The influences of polymer molecular weight and interfacial tension are also investigated in detail to reveal the underlying mechanisms of preparing shellac/PLA/PS trimer NPs with linear or triangular structures. This study will shield new light on the design and preparation of NPs with more diverse compositions and more complex structures via one-step co-precipitation and controlled phase separation and further expand the potential applications of NPs.
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JOURNAL OF SEPARATION SCIENCE
·
2022
·Vol. 45
·期 7
·1336-1344
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IF 3.614
Jiangfeng Li,Chongyuan Fan,Yating Yao,Zhaochen Liu,Fangfang Li,Binghua Jiang
Selective separation and enrichment of phosphoproteins are essential for understanding their important functions in almost all cellular processes. Here, taking advantage of the feature that cadmium ion (Cd 2+ ) has an overwhelming preference for phosphates, we developed a robust and simple Cd 2+ co-precipitation strategy for the selective isolation of intact phosphoproteins. After evaluating the feasibility of Cd 2+ in phosphoprotein precipitation, we compared the washing protocols for the removal of non-specific binding proteins and then used the best-performing protocol for the isolation of phosphoproteins from different complex samples. It was found that phosphoproteins can be specifically enriched from artificial protein mixtures containing α-casein, β-casein, and bovine serum albumin or plasma, in which bovine serum albumin or plasma were served as interferences with very high molar ratios. Applying this method to enrich phosphoproteins from complex cell lysates, a high specificity was confirmed by western blotting analysis with a phosphoprotein-specific kit. Finally, we successfully applied this method to the purification of caseins from drinking milk, highlighting its potential application in the studies where purified phosphoproteins were required. In a word, this Cd 2+ co-precipitation method enables universal and effective capture, enrichment, and detection of intact phosphoproteins, making it a powerful tool for the comprehensive analysis of the phosphoproteome.
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Advanced Intelligent Systems
·
2022
·Vol. 4
·期 6
·2200050
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IF 7.298
Depeng Kong,Geng Yang,Gaoyang Pang,Zhiqiu Ye,Honghao Lv,Zhangwei Yu,Fei Wang,Xi Vincent Wang,Kaichen Xu,Huayong Yang
Robots equipped with bionic skins for enhancing the robot perception capability are increasingly deployed in wide applications ranging from healthcare to industry. Artificial intelligence algorithms that can provide bionic skins with efficient signal processing functions further accelerate the development of this trend. Inspired by the somatosensory processing hierarchy of humans, the bioinspired co-design of a tactile sensor and a deep learning-based algorithm is proposed herein, simplifying the sensor structure while providing computation-enhanced tactile sensing performance. The soft piezoresistive sensor, based on the carbon black-coated polyurethane sponge, offers a continuous sensing area. By utilizing a customized deep neural network (DNN), it can detect external tactile stimulus spatially continuously. Besides, a novel data augmentation method is developed based on the sensor's hexagonal structure that has a sixfold rotation symmetry. It can significantly enhance the generalization ability of the DNN model by enriching the collected training data with generated pseudo-data. The functionality of the sensor and the robustness of the proposed data augmentation strategy are verified by precisely recognizing five touch modalities, illustrating a well-generalized performance, and providing a promising application prospect in human–robot interaction.
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高影响因子
POLYMER
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2022
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IF 4.432
Manman Zhao,Mingqiang Chen,Yakun Zong,Zhanxiong Li
In this paper, by means of carbene polymerization, low surface energy polymers were covalently grafted onto the surface of cotton fabric, which successfully constructed a rough morphology in-situ and provided excellent hydrophobic properties. Firstly, the grafting site was constructed on the surface of cotton fiber, and octyl diazoacetate was synthesized as a precursor and grafted onto cotton fiber. However, due to the soft side-chain grafted polymer was film-forming, the WCA of fabric grafted with octyl diazoacetate was only 124.0 ± 2.1°. In order to construct a roughening morphology in-situ, tert -butyl diazoacetate and phenyl diazoacetate was introduced and co-grafted with octyl diazoacetate. It was found that tert -butyl diazoacetate and phenyl diazoacetate were polymerized into spherical and cubic crystals on the surface of cotton fiber, respectively. These two precursors were co-grafted with octyl diazoacetate on the surface of cotton fiber to produce a rigid polymer chain and form roughening crystal morphology . The surface morphology of the treated fiber was tested by SEM, AFM and ImageJ, it was found that different morphologies could be formed on the fiber surface when octyl diazoacetate and tert -butyl diazoacetate were co-grafted with different molar ratios. Among them, when octyl diazoacetate/ tert -butyl diazoacetate(1:19)was used, the composite morphology of polymer film coated particles can be formed on the fiber surface, and the surface modification of “roughening” increased the WCA of the fabric to 143.2 ± 1.8°, which gave the fabric good hydrophobicity . When octyl diazoacetate was co-grafted with phenylethylcarbene diazoacetate at the molar ratio of 1:19, the surface of the treated fiber appeared film-like and microspheres embedded in the membrane. It is worth pointing out that the film-wrapped microsphere on the fiber surface provides a lotus leaf-like morphology. The WCA of the as-prepared fabric reached 151.2 ± 0.8° with excellent self-cleaning properties and super hydrophobicity.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Moke Zhou,Hetuo Chen,Guohong Zhou,Yi He,Shuren Zhang,Bin Tang
Four control experiments (S1: Y 3 Al 5 O 12 , S2: Y 3 Al 5 O 12 +1 wt%Nb 2 O 5 , S3: Y 3 Al 4.955 Nb 0.045 O 12 , S4: Y 2.955 Al 5 Nb 0.045 O 12 ) were designed to investigate the co-effects of Nb 2 O 5 and non-stoichiometry on the microwave dielectric properties of Y 3 Al 5 O 12 . The beneficial results of Nb 2 O 5 doping are demonstrated based on X-ray patterns, electron diffraction information, Rietveld refinement , and micromorphological characterization. Differences in dielectric properties were explored using lattice defects, ion polarizability, bond valence, and Raman spectroscopy . In contrast, the Y-deficient sample (S4) possesses the best dielectric properties ( ε r ∼ 10.37, Q × f ∼ 161,724 GHz and τ f ∼ -33.8 ppm/°C).
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Shuo Zhao,Yuepeng Liu,Yanyun Wang,Jiasheng Fang,Yiqiang Qi,Yuming Zhou,Xiaohai Bu,Shuping Zhuo
Graphitic carbon nitride, regarded as a charming conjugated polymer, has been a visible light photocatalyst. Bulk carbon nitride endures the limited light absorption ability, few surface active sites and slow separation of photoinduced charge carriers, leading to the poor catalytic activity. Herein, a new carbon (C) and phosphorus (P) co-doped carbon nitride hollow tube with adjustable optical property (CPCN) was developed by applying melamine and polyacrylic amide as the precursors and phosphoric acid as the P source via a hydrothermal-thermal copolymerization way. The effects of polyacrylic amide content on the morphology and photocatalytic performance were intensively investigated. The special hollow tube favors the improvement of active sites and visible light harvesting ability. Meantime, C and P co-doping results in the narrow band gap and rapid charge transfer, thus enabling an enhanced catalytic activity under visible light irradiation. Particularly, CPCN-50 exhibits a remarkable H 2 generation rate of 4485.7 μmol h −1 g −1 under λ > 400 nm, which is higher than pure carbon nitride CN (902.3 μmol h −1 g −1 ), C doped sample CCN-50 (3741.1 μmol h −1 g −1 ) and P doped sample CNP (2280.0 μmol h −1 g −1 ). It implies that C, P co-doping exhibits a synergistic effect on boosting photoinduced charge transfer and hindering the recombination. Moreover, CPCN-50 illustrates a higher H 2 generation rate (3024.5 μmol h −1 g −1 ) than CN (400.8 μmol h −1 g −1 ) under λ > 420 nm irradiation. This way developed in this work might exhibit utility for synthesizing highly effective photocatalysts for the CO 2 reduction, H 2 evolution and so on.
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Materials
·
2022
·Vol. 15
·期 4
·1367
·
IF 3.748
Fubing Gui,Yong Huang,Menghan Wu,Xilai Lu,Yongming Hu,Wanping Chen
A high long-term stability is crucial for room-temperature gas-sensitive metal oxide semiconductors (MOSs) to find practical applications. A series of Pd-SnO2mixtures with 2, 5, and 10 wt% Pd separately were prepared from SnO2and Pd powders. Through pressing and sintering, Pd-SnO2composite nanoceramics have been successfully prepared from the mixtures, which show responses of 50, 100, and 60 to 0.04% CO-20% O2-N2at room temperature for samples of 2, 5, and 10 wt% Pd, respectively. The room-temperature CO-sensing characteristics were degraded obviously after dozens of days’ aging for all samples. For samples of 5 wt% Pd, the response to CO was decreased by a factor of 4 after 20 days of aging. Fortunately, some rather mild heat treatments will quite effectively reactivate those aged samples. Heat treatment at 150 °C for 15 min in air tripled the response to CO for a 20 days-aged sample of 5 wt% Pd. It is proposed that the deposition of impurity gases in air on Pd in Pd-SnO2composite nanoceramics has resulted in the observed aging, while their desorption from Pd through mild heat treatments leads to the reactivation. More studies on aging and reactivation of room-temperature gas sensitive MOSs should be conducted to achieve high long-term stability for room-temperature MOS gas sensors.Keywords:CO;sensors;SnO2;aging;heat treatment;recover
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