CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jing Wang,Yu Rao,Xuhui Fan,Jin Zhang,Lei Zhao,Kongjun Zhu
AgNbO 3 -based ceramics have been the spotlight for the lead-free dielectric capacitors due to its unique antiferroelectric feature and the ever-increasing environmental concerns. Herein, synergic modulation on the energy storage properties of AgNbO 3 -based ceramics was reported, in which the over-stoichiometrical introduction of only 0.10 wt% MnO 2 at the atomic-scale leads to reduced leakage current, P r and enhanced antiferroelectric stability while the SiO 2 coating on the AgNbO 3 particles at the micro-scale greatly inhibits the grain growth, increases the breakdown strength and the electric filed inducing the AFE-FE transitions. As a result, a large recoverable energy density up to 3.34 J/cm 3 with efficiency of 60.0% was obtained in 0.10 wt% MnO 2 -doped AgNbO 3 @SiO 2 ceramic, which is 2.3 times larger than that of the pristine AgNbO 3 . This work provides a rational approach to synergically modulate the energy storage properties.
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高影响因子
POLYMER COMPOSITES
·
2021
·Vol. 42
·期 6
·3000-3010
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IF 3.171
Peng Yin,Zhicheng Shi,Liang Sun,Peitao Xie,Davoud Dastan,Kai Sun,Runhua Fan
Polymer nanocomposites with high energy-storage capability have been widely used in electronic devices. To achieve further enhanced energy density, developing nanofillers with tailored compositions and nanostructures is demonstrated to be an effective strategy. Especially, hybrid nanoparticles (NPs) with abundant internal interfaces are acknowledged as a promising candidate. Here, a class of carbon/silica hybrid nanoparticles (C/SiO 2 h-NPs) with disorderly mixed nanostructures are synthesized and employed to prepare C/SiO 2 h-NPs/polyimide nanocomposites. To reveal the influence of internal interfaces on dielectric properties, a series of comparative composites co-filled with C and SiO 2 NPs are also prepared. The breakdown strength of the C/SiO 2 h-NPs/polyimide composites can reach 303.96 kV/mm, which is over 200% that of their counterparts. It is believed that the abundant heterogeneous interfaces inside the C/SiO 2 h-NPs can effectively impede the development of conductive paths, thereby obviously enhancing breakdown strengths. Furthermore, the C/SiO 2 h-NPs/polyimide composite with 5 wt% C/SiO 2 h-NPs demonstrates a high discharged energy density of ~0.612 J/cm 3 at 150 kV/mm, which is about 2.29 times higher than pure polyimide (PI) (~0.267 @ 150 kV/mm), along with a high discharge energy efficiency of 85.9%. This work offers a practicable strategy for the design of functional NPs toward high-performance dielectric composites.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 24
·10618-10625
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IF 3.591
Qianrui Xu,Yang Wang,Pengcheng Gao,Yong Jiang
Fluorescent nanobeads are widely used due to their advantages of visualization, sensitivity and the quantitative measurement of target analytes. In terms of their applications, the stability and biocompatibility of fluorescent nanobeads are very important. In this work, “pomegranate”-like QD/SiO2/poly(St-co-MAA) (QSIP-COOH) nanobeads were synthesized by two-step strategies. First, quantum dots (QDs) were covered by a silica layer using the reverse hydrolysis method to form a core–shell structure like the seed and flesh of a pomegranate, and then a poly(St-co-MAA) layer was formed as the skin of the pomegranate. The structure and morphology of nanobeads were investigated by FTIR, TG, TEM and HRTEM. The results confirmed that QSIP-COOH nanobeads had a pomegranate structure with a QD core, an intermediate silica shell, and a carboxylated polystyrene outermost shell. TEM and HRTEM results showed that the size of the typical product was about 170 nm with the QDs of about 8 nm and the MPS-modified QD/SiO2 (QSI-CC) of about 27 nm, respectively. The in vitro cytotoxicity test showed that nanobeads had desirable stability and good biocompatibility, which made them applicable for various bioassays and diagnostics. Here, QSIP-COOH fluorescent nanobeads were applied to immunochromatography test strip (ICTS) and the result proved that QSIP-COOH fluorescent nanobeads could be used for the sensitive detection of immune human chorionic gonadotropin (HCG).
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Guohao Xu,Xuedong Zhu
A core-shell structured Zn/SiO 2 @ZSM-5 catalyst was prepared by a hydrothermal coating method, and its physicochemical properties and catalytic performance in methane co-aromatization with propane were studied using a conventional solid catalyst (Zn/ZSM-5) as the comparison. Results revealed that methane was activated on Zn sites to form a large number of Zn methyl species and then incorporated during the aromatic formation process to promote the formation of aromatics. At a space velocity of 3600 mL g −1 h −1 and the reaction temperature of 550 ℃, the methane, propane conversion and the aromatics selectivity of Zn/SiO 2 @ZSM-5 catalyst were 7.9 %, 95.9 % and 88.1 %, respectively, which were higher than those of Zn/ZSM-5 catalyst by 2.8 %, 6.7 % and 6.8 %, respectively. The unique reaction pathway of core (Zn/SiO 2 , Zn sites)-shell (ZSM-5, acid sites) was mainly responsible for the superior performance in methane co-aromatization with propane. Meanwhile, the core-shell structured Zn/SiO 2 @ZSM-5 catalyst aroused the formation of distinct micro-macroporous system, which facilitated quick diffusion of desired products out of the intraframework channels and inhibited the formation of carbon deposits. These features of Zn/SiO 2 @ZSM-5 catalyst granted it superb diffusion ability and unique core-shell structure, which greatly enhanced the methane, propane conversion and aromatic selectivity together with a preeminent catalytic stability.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Luxia Yin,Bo Zhang,Jinbing Zhou,Jiacheng Xu,Wanghui Gong,Jianguang Gao,Wensheng Ning,Zekai Zhang,Wei Hua Yu
Ag2O/SiO2–TiO2-n aerogel composites with different molar ratios of Si/Ti, prepared by a sol–gel method followed by the ambient pressure drying technique, were used for the adsorptive removal of thiophenic compounds from model fuels, along with Ag2O/SiO2-50. The physicochemical properties of aerogel composites were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF) spectroscopy, Brunauer–Emmett–Teller (BET) method, Fourier transform infrared (FT-IR) spectroscopy, NH3 temperature-programmed desorption (TPD), and pyridine (Py) FT-IR spectroscopy. The results indicated that doping Ti into Ag2O/SiO2-50 led to a slight decrease in the specific surface area, an obvious increase in the actual content of Ag, and the appearance of weak Lewis acid centers on the surface. The data for equilibrium adsorption of thiophene over Ag2O/SiO2-50 and Ag2O/SiO2–TiO2-50 were well fitted to the Langmuir and Freundlich isotherm equations. The kinetic experimental data of Ag2O/SiO2–TiO2-50 was well fitted by a pseudo-second-order model. For two adsorbents, negative values of ΔG indicated that the adsorption processes were spontaneous. The adsorption process on Ag2O/SiO2–TiO2-50 was more favorable at higher temperatures, which was contrary to that on Ag2O/SiO2-50. The incorporation of Ti into Ag2O/SiO2-50 can improve the adsorptive desulfurization performance owing to the increase in the actual content of Ag species (π-complexation centers), and thiophenic compounds can be adsorbed via Lewis acid–base interaction and S–Ti binding besides π-complexation. Among Ag2O/SiO2–TiO2-n, Ag2O/SiO2–TiO2-50 performed the best.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Xiao-Kai Gong,Xiao-Song Zhang,Xin Liu,Ru-Kun Ding,Jia-Jia Zhang,Hao Yin,Zhao-Wei Zhang,Lan Li,Jian-Ping Xu
Lead halide perovskite have attracted world-wide attention regarding their serious hazards on ecological environment and human health. To improve both the emission intensity and stability of Cs 2 AgInCl 6 , this study explores using SiO 2 to structurally adjust Cs 2 AgInCl 6 . Note that including SiO 2 changed the growth style and crystal morphology of Cs 2 AgInCl 6 from an octahedron to a truncated octahedron. After structural adjustment, the unit cells scattered, and the absorption limit broke. Moreover, SiO 2 was demonstrated to passivate the material’s surface to form an anti-oxidation protective layer. Consequently, the photoluminescence emission intensity increased by 181.5% and the stability of Cs 2 AgInCl 6 improved by 83.11%. This work provides a methodology and reference for future improvements to the luminescence of Cs 2 AgInCl 6 . Furthermore, a novel double-emission phenomenon ( λ ex = 365 nm: λ em ≈ 580 nm; λ ex = 325 nm: λ em ≈ 505 nm) of Cs 2 AgInCl 6 at cryogenic temperatures (20 K) was discovered; this phenomenon explains the shoulder emission problem of 400–450 nm at room temperature and clarifies the luminescence mechanism of Cs 2 AgInCl 6 .
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PubMed
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Mei Qixiang,Deng Guoying,Huang Zehua,Yin Yue,Li Chunlin,Hu Junhui,Fu Yang,Wang Xingpeng,Zeng Yue
Severe acute pancreatitis (SAP) is associated with high rates of mortality and morbidity. Chitosan oligosaccharides (COSs) are agents with antioxidant properties. We developed porous COS@SiO2 nanocomposites to study the protective effects and mechanisms of COS nanomedicine for the treatment of acute pancreatitis. Porous COS@SiO2 nanocomposites released COSs slowly under pH control, enabling sustained release and maintaining the drug at a higher concentration. This study aimed to determine whether porous COS@SiO2 nanocomposites ameliorate SAP and associated lung injury. The SAP model was established in male C57BL/6 mice by intraperitoneal injection of caerulein. The expression levels of myeloperoxidase, malondialdehyde, superoxide dismutase, nuclear factor-kappa B (NF-κB), the NOD-like receptor protein 3 (NLRP3) inflammasome, nuclear factor E2-related factor 2 (Nrf2), and inflammatory cytokines were detected, and a histological analysis of mouse pancreatic and lung tissues was performed. In the SAP groups, systemic inflammation and oxidative stress occurred, and pathological damage to the pancreas and lung was obvious. Combined with porous COS@SiO2 nanocomposites before treatment, the systemic inflammatory response was obviously reduced, as were oxidative stress indicators in targeted tissues. It was found that Nrf2 was significantly activated in the COS@SiO2 treatment group, and the expressions of NF-κB and the NLRP3 inflammasome were notably decreased. In addition, this protective effect was significantly weakened when Nrf2 signaling was inhibited by ML385. This demonstrated that porous COS@SiO2 nanocomposites activate the Nrf2 signaling pathway to inhibit oxidative stress and reduce the expression of NF-κB and the NLRP3 inflammasome and the release of inflammatory factors, thus blocking the systemic inflammatory response and ultimately ameliorating SAP and associated lung injury.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Yajun Deng,Guang-Ling Song,Dajiang Zheng,Yanmei Zhang
The combination of antifouling and biocidal methods is an efficient antimicrobial strategy to alleviate environmental biofouling. Herein, a functional organic/inorganic hybrid coating with integrated terpolymer and hybrid Ag@TA-SiO 2 nano spheres was designed and fabricated for antifouling purpose for the first time. The silicon-containing terpolymer (GHM) was fabricated via a simplified free radical co-polymerization process with glycidyl methacrylate (GMA), 2-hydroxyethyl methacrylate (HEMA) and 3-(methacryloxypropyl) trimethoxysilane (MPS). It was expected that the (3-aminopropyl) triethoxysilane (KH550) would become immobilized at the epoxide ring of the GMA and eventually crosslinked, acting as a backbone for the final polymeric coating (PGHMK). Meanwhile, Ag nano-particles were decorated with tannic acid (TA) to have a composite surface structure and loaded with silica (SiO 2 ) to form raspberries. The fabrication of the decorated and loaded antibacterial nano particle Ag@TA-SiO 2 was environmental-friendly, high efficiency and low-cost. The PGHMK coating was expected to act as an effective antifouling barrier, and the embedded Ag@TA-SiO 2 as a functional biocide carrier to collectively inhibit biofouling. To ensure the designed fabrication processes and the products, the microstructural, compositional, morphological changes of the copolymers and nanoparticles were characterized by means of FT-IR, 1 H nuclear magnetic resonance, X-ray photoelectron spectroscopy and atomic force microscopy. The antifouling and bactericidal properties of the composite coatings were also systematically evaluated through measuring the adsorption of protein, growth of bacteria and attachment of microalgae on the coating surface. The results indicated that the coating suppressed 98.6 % of protein adsorption, and its antibacterial efficiency reached 99.1 % and 82.7 % for E. coli and S. aureus , respectively. The coating could also remarkably reduce the attachment of microalgae N. Closterium and Dicrateria zhanjiangensis by 93.5 % and 97.6 %, respectively. It is envisioned that the composite coating may provide a promising antifouling and antibacterial surface for marine engineering structures.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2020
·
IF 4.192
Lihong Su,Lulu Wang,Jingke Xu,Zonghan Wang,Xiaolin Yao,Jing Sun,Jianlong Wang,Daohong Zhang
Gold nanoparticles (AuNPs) are the most commonly used signal materials in lateral flow immunoassay (LFIA). However, the assay sensitivity of traditional AuNP-based LFIA is usually limited by the incomplete competition between free target analytes and immobilized antigens for the binding of AuNP-labeled antibodies. To unfreeze this limitation, here, asymmetric Au–SiO2 Janus NPs (about 66 nm) were designed and synthesized. Au–SiO2 Janus NPs can assemble into snowman-like anisotropic structures and combine two different physicochemical properties at their opposite sides, where the AuNP side mainly possesses the antibody conjugating and signal providing functions and the SiO2 side primarily offers the stable function. In virtue of the unique asymmetric nanostructure, only the AuNP side can interact with target analytes by specific antigen–antibody interactions, which could significantly improve the efficiency of competition. Selecting furazolidone as a model analyte, the immunoassay biosensor showed a limit of detection as low as 0.08 ng/mL, 10-fold decreased than that of the AuNPs-LFIA. Moreover, the Au–SiO2 Janus NP lateral flow immunoassay was well applied in chicken, pork, honey, and beef food samples with visual detection limits of 0.8 ng/g, 0.16 ng/g, 0.4 ng/mL, and 0.16 ng/g, respectively. The Au–SiO2 Janus NPs possess the advantages of both materials, which will broaden their applications as a potential alternative in the rapid and sensitive detection of antibiotic residues.
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高影响因子
ANALYST
·
2020
·Vol. 145
·期 23
·7616-7622
·
IF 3.978
Jingxian Li,Xueling Shan,Ding Jiang,Yuru Wang,Wenchang Wang,Zhidong Chen
In this work, a solid-state electrochemiluminescence (ECL) sensor based on resonance energy transfer (RET) was proposed using MoS2QDs@g-C3N4 as a donor and NH2-SiO2@PTCA as an acceptor. Herein, MoS2QDs could significantly facilitate the stability and efficiency of the ECL of g-C3N4. PTCA provided a large platform to anchor NH2-SiO2 nanoparticles. The prepared MoS2QDs@g-C3N4 exhibited good spectral overlap with the UV–vis absorption spectrum of NH2-SiO2@PTCA. Based on this, we designed an “off–on” ECL sensing strategy for sensitive and selective detection of glutathione (GSH). Under the best conditions, the linear range of the sensor for GSH detection was from 0.001 to 100 μM with a detection limit of 0.63 nM (S/N = 3). More importantly, GSH in commercial samples can be detected using the proposed sensor, which indicated its superior detection capabilities and potential application value in commercial medicines.
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ACS Sensors
·
2020
·
IF 7.333
Xing Lu,Guobao Zhou,Jian Zhang,Wei Xie,Yiwen Yang,Yanbo Zeng,Zulei Zhang,Hailong Wang,Lei Li
A novel SiO2@ MIPIL fluorescence sensor for the highly sensitive detection of 2,4,6-trichlorophenol was prepared by using surface molecularly imprinting technology with SiO2 microspheres as carriers and 3,3′-(anthracene-9,10-diylbis(methylene))bis(1-vinyl-1H-imidazole-3-ium) chloride as a double recognition fluorescence functional monomer. The prepared molecularly imprinted polymer (SiO2@MIPIL) was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, laser confocal microscopy, and nuclear magnetic resonance. Compared with the polymer obtained via bulk polymerization (MIPIL), the surface molecularly imprinted polymer (SiO2@MIPIL) has a better linear range (0.1–50 nM), lower detection limit (89 pM), and shorter detection time (approximately 1.5 min). The fluorescence sensor also shows good specificity, high sensitivity, good stability, and reusability. Satisfactory results were obtained when using this sensor in industrial wastewater and spiked environmental water.
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高影响因子
Theranostics
·
2020
·
IF 8.579
Chaoli Wang,Peng Chen,Youbei Qiao,Yuan Kang,Chaoren Yan,Zhe Yu,Jian Wang,Xin He,Hong Wu
Background : Biofilm infection caused by multidrug-resistant bacteria is difficult to eradicate by conventional therapies. Photodynamic therapy (PDT) is an effective antibacterial method for fighting against biofilm infection. However, the blocked photosensitizers outside of biofilm greatly limit the efficacy of PDT. Methods : Herein, a novel acid-responsive superporogen and photosensitizer (SiO 2 -P Ce6-IL ) was developed. Because of the protonation of the photosensitizer and the high binding energy of the polyionic liquid, SiO 2 -P Ce6-IL changed to positive SiO 2 -P IL + in an acidic microenvironment of biofilm infection. SiO 2 -P IL + could combine with negatively charged extracellular polymeric substances (EPS) and create holes to remove the biofilm barrier. To strengthen the interaction between SiO 2 -P IL + and EPS, SiO 2 -P IL + of high charge density was prepared by grafting the high-density initiation site of ATRP onto the surface of the SiO 2 base. Results : Due to the rapid protonation rate of COO - and the strong binding energy of SiO 2 -P IL + with EPS, SiO 2 -P Ce6-IL could release 90% of Ce6 in 10 s. With the stronger electrostatic and hydrophobic interaction of SiO 2 -P IL + with EPS, the surface potential, hydrophobicity, adhesion and mechanical strength of biofilm were changed, and holes in the biofilm were created in 10 min. Combining with the release of photosensitizers and the porous structure of the biofilm, Ce6 was efficiently concentrated in the biofilm. The in vitro and in vivo antibacterial experiments proved that SiO 2 -P Ce6-IL dramatically improved the PDT efficacy against MRSA biofilm infection. Conclusion : These findings suggest that SiO 2 -P Ce6-IL could rapidly increase the concentration of photosensitizer in biofilm and it is an effective therapy for combating biofilm infection.
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