MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 12
·1-10
·
IF 6.408
Sun Min,Wang Xiuqin,Ding Yali,Feng Juanjuan
In order to improve the selectivity and stability of melamine–formaldehyde (MF) aerogel, it was composited with TiO 2 aerogel. A TiO 2 -MF hybrid aerogel was in situ prepared on the surface of carbon fibers for in-tube solid-phase microextraction (SPME). The extraction performance of TiO 2 -MF aerogel was regulated by changing the ratio of TiO 2 sol and MF sol during the material preparation. Coupled with high-performance liquid chromatography-diode array detection (HPLC–DAD), the extraction tube filled by TiO 2 -MF aerogel-coated carbon fibers was evaluated with several types of environmental pollutants including polycyclic aromatic hydrocarbons (PAHs), estrogens, and ultraviolet filters. Because of favourable extraction performance of PAHs they were selected as model analytes, and some important influence factors were optimized for satisfactory sensitivity. The detection limits were in the range 0.05–0.10 μg L −1 , owing to high enrichment factors (653–1007). The online in-tube SPME-HPLC–DAD method was verified for the determination of trace PAHs in environmental water samples, and acceptable recovery (70–118%) was achieved. The analytical methods also displayed some advantages in comparison with other reports. Moreover, the extraction tube exhibited satisfactory chemical stability. Graphical abstract
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 12
·1-11
·
IF 6.408
Wang Jing,Xu Wei,Zhou Lin,Zhang Tianqi,Yang Na,Wang Min,Luo Xuemei,Jin Lu,Zhu Huaijun,Ge Weihong
The peroxidase-like activity of MXene@Fe 3 O 4 nanocomposites and the relevant colorimetric application have been investigated for the first time. According to a kinetic study, MXene@Fe 3 O 4 nanocomposites displayed higher peroxidase activity than their individual components, and the catalytic process followed a ping-pong mechanism. The improved peroxidase-like activity of the MXene@Fe 3 O 4 nanocomposites was obtained due to the synergetic impact of the Fe 3 O 4 and MXene phases, the huge ion-accessible interface, and quick electron transfer channels in the nanocomposites. In the presence of hydrogen peroxide (H 2 O 2 ), the MXene@Fe 3 O 4 nanocomposites can catalyze the reaction of the colorless substrate 3, 3, 5, 5-tetramethylbenzidine (TMB) into oxidized TMB which revealed a blue color at 652 nm. After the introduction of glutathione (GSH), the blue color was gradually fading owing to the hydroxyl radical scavenging effect of glutathione. A colorimetric detection platform based on the peroxidase-like activity of the MXene@Fe 3 O 4 nanocomposites was developed for H 2 O 2 and GSH with a detection limit of 0.4 μM and 0.5 μM, respectively. The calibration plot for glutathione detection is calculated by absorbance difference at 652 nm, which ranged from 0.5 to 10 μM with a detection limit of 0.2 μM. The recoveries of GSH with different concentrations ranged from 93.76 to 108.50% and the relative standard deviation from 0.30 to 5.96%. This work significantly extends the application of MXene@Fe 3 O 4 nanocomposites in the construction of colorimetric sensors and reveals a satisfactory result in real sample analysis. Graphical Abstract
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JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 30
·期 3
·871-880
·
IF 2.523
Jiang Wen-Hong,Yang Jian
Brittleness and pulverization have troubles with phenolic porous material application in thermal insulation and mechanical elasticity. Here, we fabricated phenolic/polydimethylsiloxane composites by surface modification and sol impregnation method, it reduced the thermal conductivity and enhanced toughness. Polydimethylsiloxane (PDMS) was used as a bonding point to connect the phenolic structure, when a load was applied, the existence of wrinkles and the interface interaction effectively consumes energy so that the resorcinol-formaldehyde/PDMS materials had cyclic compressibility. Composite materials show better mechanical elasticity and thermal insulation compared to modified resorcinol formaldehyde (RF) foam. After interfacial modification and coating by different sol concentrations, the thermal conductivity significantly decreased from 0.105 to 0.75 Wm −1 K −1 . Moreover, the compression strength of PDMS/RFSi0.6 increased from 0.05 to 0.7 MPa. This work paves a simple and effective way to simultaneously enhance thermal insulation performance and mechanical properties of organic porous materials.
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Drug Delivery and Translational Research
·
2023
·
IF 5.4
Nan Longyi,Song Haoyuan,Wang Haijun,Mi Ru,Wang Xiaoxu,Fang Liang
The aim of this study was to design a tulobuterol (TUL) patch with good penetration behavior and mechanical properties. Particular attention was paid to the effect of transdermal permeation enhancers on the release process of metal ligand-based acrylic pressure-sensitive adhesive (AA-NAT/Fe 3+ ). The type and dosage of the enhancers were screened by in vitro transdermal penetration in rat skin. The optimized formulation was evaluated in a pharmacokinetic study in rats. Furthermore, the molecular mechanism by which Azone (AZ) improves the release rate of TUL from AA-NAT/Fe 3+ was investigated by FT-IR, shear strength test, rheological study, and molecular simulation. As a result, the optimized formula using AA-NAT/Fe 3+ showed better mechanical properties compared to commercial products. Meanwhile, the AUC 0-t and C max of the optimized patch were 1045 ± 89 ng/mL·h and 106.8 ± 28.5 ng/mL, respectively, which were not significantly different from those of the commercial product. In addition, AZ increased the mobility of the pressure-sensitive adhesive (PSA) rather than decreasing the drug-PSA interaction, which was the main factor in enhancing TUL release from the patch. In conclusion, a TUL transdermal drug delivery patch was successfully developed using metal-coordinated PSA, and a reference was provided for the design of metal-coordinated acrylic PSA for transdermal patch delivery applications. Graphical Abstract
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CLAYS AND CLAY MINERALS
·
2023
·
IF 2.2
Weng Ming,Wang Xiuhua
Muscovite has been used increasingly as a substrate in flexible electronics and fillers in high-performance nanocomposites. Muscovite-based interfacial interactions play a crucial rule in material fabrication. Hansen solubility parameters (HSPs) have proven useful in characterizing molecular interactions within/between condensed phases. The present study aimed to determine the HSPs of raw muscovite (RM) and to investigate solvent dispersion mechanisms of RM. To achieve this, the solubilities of RM in 17 solvents were evaluated by dispersion tests, and the HSPs of RM were calculated as the center of the optimal solubility rotated-ellipsoid in HSP space, which included all good solvents, had the smallest number of outliers, and had the smallest volume. The resulting dispersion, polar, and hydrogen bonding components of RM were 18.301, 2.366, and 3.727 MPa 1/2 , respectively. By considering the HSPs and Kamlet-Taft's solvatochromic parameters of solvents, we concluded that the low polarity of RM is due to hindered K + /H + exchange on the RM surface, resulting from limited water/moisture contact. For solvent dispersion of RM, essential conditions include strong dispersion forces and weak polar forces, finely tuned to match the surface property of RM at a certain hydration level. The HSPs of RM determined from dispersion tests were restricted to predicting/characterizing RM-based interfacial phenomena in an environment with strictly controlled water/moisture content. The HSP calculation method proposed herein was applicable to any clay mineral.
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npj Biofilms and Microbiomes
·
2023
·Vol. 9
·期 1
·1-13
·
IF 9.2
Zhao Tong,Zhang Yue,Nan Linhua,Zhu Qing,Wang Shukai,Xie Yutao,Dong Xinling,Cao Cui,Lin Xiaoliang,Lu Yu,Liu Yuxia,Huang Linjuan,Gong Guiping,Wang Zhongfu
Understanding how dietary polysaccharides affect mucin O -glycosylation and gut microbiota could provide various nutrition-based treatments. Here, the O -glycan profile of the colonic mucosa and gut microbiome were investigated in C57BL/6J mice fed six structurally diverse dietary polysaccharides and a mixture of six fibers. Dietary polysaccharides increased total O -glycans, mainly by stimulating neutral glycans. Highly branched arabinogalactan promoted terminally fucosylated core 1 O -glycans; whereas linear polysaccharides, including pectin, konjac glucomannan, inulin, and the fiber mixture, favored terminally di-fucosylated O -glycans. The last three polysaccharides also lowered the level of sulfated O -glycans and sialylated mono-fucosylated O -glycans. Varied monosaccharide composition in mixed polysaccharides had a synergistic beneficial effect, boosting fucosylated neutral glycans, decreasing acidic glycans, and stimulating microbial richness and diversity. Dietary polysaccharides containing arabinose and sulfate groups enhanced the relative abundances of Akkermansia and Muribaculaceae , respectively. The present comparison reveals the relationship between dietary polysaccharide structure, mucin O -glycan composition, and intestinal microorganisms.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 36
·1-9
·
IF 2.8
Xiong Lu,Hu Haisheng,Liu Meitang,Zhang Chongji
Upconversion materials have significant application prospects in many fields due to the advantages of being excited by infrared light. However, the development of upconversion materials is constrained by low upconversion efficiency and low luminescence intensity. The aim of this work is to improve the luminescence efficiency and intensity of fluorine-based upconversion luminescent materials through ternary alkali metal doping. A series of ternary alkali metal-doped Li x Na y K (1−x−y) YF 4 :Yb 3+ , Er 3+ novel upconversion luminescent materials were synthesized by a one-step facile hydrothermal method, and their mechanisms were explored. The results show that the doping of Li, Na, and K ions changes the crystal structure of Li x Na y K (1−x−y) YF 4 :Yb 3+ , Er 3+ , thereby affecting the spatial structural relationship between the rare-earth ions, which changes the energy transfer efficiency to them. The luminescence intensity of the prepared Li x Na y K (1−x−y) YF 4 :Yb 3+ , Er 3+ was 30 times higher than that of the undoped samples when doped with Li, Na, and K ions in a molar ratio of 10:6:9. This study provides a simple and effective method for the preparation of upconversion materials with excellent luminescent properties.
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JOM
·
2023
·
IF 2.6
Zhu Yanshaozuo,Shen Xixun,Chen Qian,Xu Qunjie
A silicate and phosphate composite passive film on zinc was prepared from a composite passivation solution containing zinc dihydrogen phosphate and sodium metasilicate. The morphology, composition, valence and functional groups of the passive film with different passivation times were analyzed through field-emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy, X-ray photoelectron spectroscopy and infrared spectroscopy to understand its evolution process. The passive film exhibits a cyclic film-forming process with a periodic ratio of silicate and phosphate, which is caused by the periodic changes in the alkalization degree of the interface between the electrode and the solution. Such periodic film-forming process promotes the passive film growth and makes the passive film uniform and dense. Electrochemical analysis, immersion tests and copper sulfate spotting tests illuminate that the composite passive film is more corrosion-resistant than the pure silicate passive film. This composite passivation film exhibits a uniform corrosion behavior with gradually expanding micropores due to the effective inhibition of inward diffusion and permeation of chloride ions by the dense film structure of cyclic growth, which avoids the pinhole corrosion and improves the protection of the passivation film.
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Communications Biology
·
2023
·Vol. 6
·期 1
·1-16
·
IF 5.9
Liu Shaojun,Li Dongyu,Yu Tingting,Zhu Jingtan,Semyachkina-Glushkovskaya Oxana,Zhu Dan
The dysfunction of microglia in the development of diabetes is associated with various diabetic complications, while traditional insulin therapy is insufficient to rapidly restore the function of microglia. Therefore, the search for new alternative methods of treating diabetes-related dysfunction of microglia is urgently needed. Here, we evaluate the effects of transcranial photobiomodulation (tPBM) on microglial function in diabetic mice and investigate its mechanism. We find tPBM treatment effectively improves insulin therapy on microglial morphology and reactivity. We also show that tPBM stimulates brain drainage system through activation of meningeal lymphatics, which contributes to the removal of inflammatory factor, and increase of microglial purinergic receptor P2RY12. Besides, the energy expenditure and locomotor activity of diabetic mice are also improved by tPBM. Our results demonstrate that tPBM can be an efficient, non-invasive method for the treatment of microglial dysfunction caused by diabetes, and also has the potential to prevent diabetic physiological disorders.
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JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 11
·7475-7483
·
IF 2.1
Sun Baorui,Zhang Minghui,Li Junjie,Li Zhe,Wen Mingli,Liu Zhi-Quan
Ag sintering technology for die-attach application in power semiconductors has garnered significant attention in recent years due to its excellent high-temperature service reliability. In this study, a highly reliable bonding joint was achieved using a specific Ag paste, resulting in shear strength of 37.63 MPa after pressureless bonding at 250°C for 10 min. However, a significant reduction in bonding strength was observed when using another set of Ag paste with better sintering performance. To investigate this anomalous phenomenon, we have performed a series of characterizations and proposed a corresponding bonding formation mechanism. The conclusions and inferences drawn from this study offer valuable theoretical support for the further application of Ag sintering, thereby promoting the advancement of this technology. Graphical Abstract
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JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 9
·1-10
·
IF 2.8
Tian Guangming,Zhao Shuo,Pan Longkai,Yang Dong,Ma Jianhua
Poly(ε-caprolactone) (PCL)-based semi-crystalline polymers are shape memory polymers that have been extensively used in various applications ranging from biological, soft robots and flexible electronic devices. Despite the large number of studies aiming at constructing the well-defined crosslinked polymer networks, detailed investigations in terms of structural factors that influence the thermal-mechanical and shape memory properties are still poorly understand and investigated. In this work, PCL crosslinked networks with different molecular weight of diacrylate PCL macromonoter (M n ) are prepared via base-catalyzed thiol-ene Michael addition. The results indicate that the melting temperature, the crystallization temperature and the crystallinity of the polymer networks exhibit an upward trend with increment of M n . Besides that, the tensile strength and shape memory properties are also correlated with M n . Controlled-strain DMA characterization on shape memory properties show that the cPCL-10000 network exhibits the most remarkable shape fixity and shape recovery ratio, indicative of lowering cross-linking density and chains mobility. In particular, permanent shape reconfiguration can also be achieved by triggering transesterification within the same polymer network, and a possible molecular mechanism responsible for the elasticity-based shape memory effect and plasticity-based permanent shape reconfigurability is proposed and combined to present the 2D-to-3D shape-morphing behaviors.
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JOM
·
2023
·Vol. 75
·期 12
·5300-5309
·
IF 2.6
Wang Huan,Cheng Zhengzai,Djouonkep Lesly Dasilva Wandji,Lan Chupeng,Wang Linfeng,Cai Shuanpu,Ding Ling,Gauthier Mario
Petroleum-based polyesters are widely used in daily life. However, their reliance on petroleum resources and non-biodegradability have raised concerns. Due to the advantages of being renewable, degradable, and abundant, bio-based polyester is expected to become a breakthrough in replacing petroleum-based polyester. In this study, p -hydroxybenzaldehyde, a bio-based monomer, was used to synthesize a novel diol, 2,2′-(4-((4-ethylphenyl)diazenyl)phenylazanediyl)diethanol (EDPD). The EDPD was then polymerized with 1,4-cyclohexanedimethanol (CHDM) and aliphatic diacids to synthesize a series of aliphatic-aromatic polyesters. Thermal analysis showed that the T g varied from 43°C to 104°C, while the melting point ( T m ) varied from 118°C to 156°C. All the polyesters exhibited high yield strengths (48–79 MPa) and tough values (elongation at break of 240–330%). After 30 weeks of soil incubation, the mass loss of the copolyester could reach 4.3%. The investigation of the eco-toxicity of the copolyesters showed that the survival rate of Eisenia foetida was more than 80%, demonstrating their low toxicity in natural habitats. The copolyesters investigated in this study exhibited good thermal, mechanical, and biodegradability properties. The properties of the copolyesters can be adjusted by varying the length of the carbon chains of the dicarboxylic acid moieties. These bio-based copolyesters could provide an important way to promote carbon neutrality and sustainable development of bio-based plastics.
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