COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2018
·
IF 4.514
Zheng Su,Hua Wang,Xianzhu Ye,Konghu Tian,Weiqi Huang,Jing He,Yulan Guo,Xingyou Tian
In this work, we presented novel cycloaliphatic epoxy resin composites filled with multi-layer graphene (mG)/hexagonal boron nitride (h-BN) with high thermal conductivity and good electrical insulating. Firstly, the h-BN platelets were modified by mussel-inspired method with dopamine chemistry to obtain the modified filler h-BN@PDA. And the attachment of polydopamine molecule improved the interfacial adhesion between polymer matrix and filler. Secondly, the mG with fixed content was mixed with h-BN@PDA and then the hybrid filler mG/h-BN@PDA was added to the cycloaliphatic epoxy resin to obtain the polymer composites . Because of the high aspect of the filler, low viscosity of the polymer matrix , and assistance of the gravity force, the hybrid filler would stack alignment. It was found that the hybridization of the filler and alignment of the hybrid filler resulted in the enhancement of properties of the composites such as the thermal decomposition, mechanical (tensile strength = 5.50 MPa), thermal (through-plane ∼ 1.27 W/m K, in-plane ∼ 1.31 W/m K) and electrical insulating (electrical conductivity < 1.5 × 10 −10 S/cm) properties. The obtained composites could be applied in thermal management area.
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Animals
·
2026
·Vol. 16
·期 5
·749
·
IF 3.2
Xitong Guan,Haokai Ma,Rui Liu,Yiou Xu,Diene Gnagna,Xiujie Yin,Yonggen Zhang,Yang Li
Microplastic pollution is rising worldwide and may harm both animals and people. Dairy cows rely on a large stomach compartment, called the rumen, to break down feed with the help of many microbes, and this process produces gases and acids that reflect healthy digestion. In this study, we tested whether tiny plastic particles made of polystyrene, in different sizes and amounts, change rumen digestion and whether rumen microbes can break these plastics down. We found that exposure to these particles reduced fermentation activity, shown by lower gas production and lower levels of volatile fatty acids, and the negative effects became stronger as the amount of microplastics increased. At the same time, higher amounts and larger particles increased the activity of some digestive enzymes, suggesting a stress response in the microbial system. Microplastics also lowered the abundance of certain microbes and changed the chemicals produced during digestion. After 24 h, the amount of microplastic particles decreased, indicating that rumen microbes can partially degrade them and generate small chemical products that could further disturb rumen balance. These findings help explain how microplastics may influence ruminant health and suggest a possible biological route to reduce microplastic contamination. Microplastic pollution is increasingly serious worldwide, threatening human and animal health. The cow rumen is a key organ for nutrient digestion and absorption, and its fermentation is closely related to rumen microorganisms. Here, we investigated how polystyrene microplastics (PS-MPs) with varying particle sizes and concentrations affect rumen fermentation and the biodegradability of PS-MPs by rumen fermentation. The results reveal that exposure to PS-MPs lowered gas production and gas concentrations, as well as volatile fatty acid content, and these decreases were positively correlated with PS-MP concentration. However, higher PS-MP concentration and larger particle size increased the activity of carboxymethyl cellulose, β-glucosidase, and xylanase. Furthermore, PS-MP exposure reduced the abundance of certain rumen microorganisms and altered metabolic pathways and metabolites linked to PS-MP biodegradation. It was also found that PS-MP content decreased significantly after 24 h fermentation. Therefore, PS-MPs can inhibit rumen fermentation by affecting the rumen microbiome, and rumen microorganisms and their secreted enzymes can biodegrade PS-MPs to produce styrene and derivatives; such small molecules may further disrupt rumen homeostasis, thereby affecting lactation performance. In addition, rumen microbial degradation of PS-MPs provides a new idea to resolve future microplastic contamination challenges.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Qiang Liu,Qiying Yang,Qiuyue Zhang,Fei Lv,Aiyuan Cheng,Hanxiao Liu,Shuanhong Ma,Likai Wang,Qinze Liu
Removing organic dyes from polluted water by mesoporous polymeric composite has recently attracted intensive attentions. Herein, the mesoporous poly(pyrogallol-tetraethylenepentamine)/MSU-H (PPTA/MSU-H) adsorbent was tapped for the capture of Congo red (CR) in aquatic environment via mussel-inspired encapsulation strategy. Many characterizations ( e.g. FT-IR, SEM, BET, etc ) are employed to confirm the successful decoration of PPTA resin. Effects of composite components, initial concentrations, environmental temperatures, adsorbent dosages, initial pH values, and foreign ions on the removal of CR by PPTA/MSU-H- x composites have been investigated successively. At optimal conditions of process variables, PPTA/MSU-H-20 exhibits the highest R % value (94.79 %) and reaches adsorption equilibrium at 180 min. The adsorption behavior of the representative adsorbent is matched well with the pseudo-second-order model, meaning one CR molecule binds with two capture sites. Furthermore, it indicates a monolayer homogeneous adsorption on PPTA/MSU-H-20 with the maximum theoretical capacity of 222 mg g −1 according to the well fitted Langmuir model. The removal mechanism of CR may be ascribed to hydrogen bonding, π-π stacking, electrostatic attraction, pore filling effects, and addition reaction. Overall, results reveal that mesoporous PPTA decorated adsorbent has a rewritable refabrication character and excellent specificity for the anionic dye purification in polluted water.
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JOURNAL OF FLUORESCENCE
·
2021
·Vol. 31
·期 4
·1125-1132
·
IF 2.217
Wu Chuqiao,Lin Xin,Wang Qianming
The new design strategy will provide the possibility for preparing a dynamic sensor by employing the inhibition of C = N isomerization. In this work, the functional probe 4-(1 H-imidazo [4,5-f] [1,10]-phenanthrolin-2-yl) benzaldehyde oxime (compound 4 ) has been synthesized and such molecule gives rise to blue emission. Due to the incorporation of hypochlorite, the oxime group can be oxidized to the structure of aldehyde. As a result, the molecular motif exhibits sharp emission change from blue to green due to the addition of hypochlorite with enough sensitivity and selectivity (detection limit = 53 nM, linear range 0.5-8.0 µM). It has also been used for monitoring ClO − by employing solution color change and the absorption signal difference could effectively rule out the effects of interference species. To our knowledge, it will be the first case of a highly selective hypochlorite sensor derived from oxime isomerization reaction based on phenanthroline backbone.
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JOURNAL OF ORGANIC CHEMISTRY
·
2021
·
IF 4.354
Xiyan Rui,Chao Wang,Dongjuan Si,Xuechao Hui,Keting Li,Hongmei Wen,Wei Li,Jian Liu
A one-pot and step economic reaction involving Rh(III)-catalyzed C–H thiolation and relay Cu(II)-catalyzed C–N amination of acetanilide and 2-bromothiophenol is reported here, with several valuable phenothiazine products obtained. This synthesis protocol proceeds from easily starting materials, demonstrating high atom economy, broad substrate scope, and good yield. Furthermore, the directing group can be easily eliminated, and chlorpromazine is provided in a large scale; thus this synthesis protocol could be utilized to construct phenothiazine scaffolds.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2020
·
IF 4.244
Wenxiu Jiang,Xuejun Yu,Yuan Hui,Bowei Shen,Zhang Farong,Zhiquan Pan,Hong Zhou
Diosgenin is an important intermediate of steroid hormone drugs, green production of diosgenin with high yield is a key research issue. In this study, a convenient, efficient, and eco-friendly approach was developed to produce diosgenin from saponins in D. zingiberensis C. H. Wright (Curcuma longa L) using a magnetic solid acid. Fe 3 O 4 @SiO 2 -Pr-S-SO 3 H is a heterogeneous catalyst and was obtained by loading 3-(mercaptopropyl) trimethoxysilane on the surface of Fe 3 O 4 @SiO 2 , followed by sulfonation with chlorosulfonic acid. The magnetic solid acid catalyst was fully characterized by Fourier Transform-Infrared (FT-IR) spectra, thermo gravimetric analysis (TGA), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and X-ray photoelectron spectroscopy (XPS), scanning electron microscope(SEM), transmission electron microscope (TEM), NH 3 -TPD, elemental mapping analysis. The effects of single factors, such as the solid acid mass, alcoholysis temperature, extraction time, and solvent volume on the diosgenin yield were analyzed. The extraction parameters for diosgenin were optimized by response surface methodology (RSM). The optimized values for the solid acid mass, solvent volume, extraction time, and temperature were 0.22 g, 7.8 mL, 7.4 h, and 100 °C, respectively. Under the optimized conditions, the maximum yield of diosgenin was 19.15 %. The solid acid reported in this work exhibited higher catalytic activity at a smaller dosage than traditional sulfuric acid and other solid acids. The alcoholysis products were identified by high-performance liquid chromatography-mass spectrometry (HPLC-MS). Alcoholysis catalysed by an as-prepared magnetic solid acid is clearly superior in terms of catalytic activity, dosage, and reusability. It is a promising strategy for the green production of diosgenin.
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Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-16
·
IF 12.264
Zhang Shucong,Wang Wenbin,Hu Feilong,Mi Yan,Wang Shuzhe,Liu Youwen,Ai Xiaomeng,Fang Jiakun,Li Huiqiao,Zhai Tianyou
The 2D CoOOH sheet-encapsulated Ni 2 P into tubular arrays electrocatalytic system with expediting mass transport, structural stability, and tuned electron was conceptually proposed.
The designed electrocatalysts realize expectant 1000 mA cm −2 -level-current-density hydrogen evolution in neutral water for over 100 h.
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高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 19
·3677-3686
·
IF 4.034
Guohai Xu,Min Xie,Xiaokang Li,Wenjie Shi,Hui Yu,Yinhui Hu,Xiaochen Xun,Yongrong Xie
In this work, crystal engineering is focused on the self-assembly of 2D 63 topology into different supramolecular networks using unit–unit H-bonds. Four related coordination polymers, [Zn2(teaH2)(ndc)1.5]·MeOH (1), [Co2(teaH2)(ndc)1.5]·MeOH (2), [Zn2(deaH)(ndc)1.5]·MeOH (3) and [Co2(teaH2)(btb)]·3EtOH (4) where ndc2− = 2,6-naphthalenedicarboxylate, btb3− = benzene-1,3,5-tribenzoate, teaH3 = triethanolamine, and deaH2 = diethanolamine, contain a well-known 63 subnet and the binuclear units. Furthermore, their 63 nets present different hexagonal windows (chair- or ship-shaped) and diversified layer arrays (ABAB or ABCABC sequence). The 63 subnet and symmetry-related unit–unit H-bonds as supramolecular synthons can build up different supramolecular networks. Compounds 1 and 2 show a distorted diamond supramolecular network due to formation of a square-pyramidal node. Because the formation of a seesaw-shaped node, compound 3 features a general diamond supramolecular network with 3-fold interpenetration. Compound 4 exhibits a binodal supramolecular framework in that H-bonding interactions occur between three binuclear units. In addition, the diversified layer array has endowed compound 4 with a large 1D channel, which can be characterized by standard N2 adsorptions. Compound 4 has a type I adsorption isotherm with an appreciable adsorption of 45.04 cm3 g−1 at 0.40 P/P0, whereas 1–3 do not exhibit appreciable N2 uptake.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Chuqiang Que,Hongwei Zhu,Chang Liu,Ziang Qiang,Chen Xu,Minjie Li,Jia Liu,Jing Cao,Pengjian Zuo,Jing Wang,Xin Yang
With the rapid expansion of textile printing and aquaculture industries, efficient dye wastewater treatment is urgently needed. Here, magnetic sulfonic acid-functionalized covalent organic frameworks (Fe 3 O 4 @TpBD-SO 3 H COFs) were synthesized via a functional defect strategy using 4-aminobenzene-1,3-disulfonic acid (ADSA) as a competing monomer, generating periodic and sulfonate-rich nano adsorbent. Adsorption experiments involving malachite green (MG) and crystal violet (CV) in single and binary systems, supported by adsorption model fitting, indicated multimolecular adsorption through non-parallel molecular orientations. In binary adsorption system, MG enhanced CV adsorption (synergistic effect), whereas CV suppressed MG adsorption (antagonistic effect). Dynamic competitive adsorption tests suggested that adsorption configuration transitions between single and binary systems influenced this co-adsorption phenomenon. Incorporating Fe 3 O 4 magnetic cores rendered Fe 3 O 4 @TpBD-SO 3 H COFs highly hydrophilic, achieving excellent adsorption capacities for MG (1010.6 mg/g) and other cationic dyes, while minimally adsorbing anionic dyes. Moreover, the material exhibited strong resistance to interference from metal salts and maintained stable adsorption performance after ten regeneration cycles. Successful purification of real wastewater samples further demonstrates its practical potential for selective cationic dye removal from complex aqueous systems.
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Environmental Science-Nano
·
2025
·
IF 5.1
Lu Wang,Siyuan Zhang,Jukun Xiong,Meicheng Wen
Formaldehyde (HCHO), a prevalent indoor volatile organic compound, poses significant health risks to humans even at very low concentrations. As a result, its efficient degradation at room temperature is of utmost importance. However, the detailed mechanism for catalytic oxidation of formaldehyde remains unclear, particularly regarding the role of water vapor, which has been subject to considerable debate. In this study, we synthesized Pt-supported TiO2 glass fiber catalysts (Pt/TiO2 GF) via NaBH4 reduction to investigate the reaction pathways and clarify the influence of water vapor on the oxidation process. The reaction mechanism and intermediates were systematically studied at room temperature using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), kinetic isotope effect (KIE) analysis, and density functional theory (DFT) calculations. Results revealed a clear reaction pathway of HCHO → DOM → HCOO− → CO2, with formate C–H bond cleavage (HCOO−* + O* → CO2 + OH*) identified as the rate-determining step. Both experimental KIE results and theoretical calculations confirmed that water vapor substantially reduces the activation barrier for this step, significantly promoting formate decomposition and subsequent CO2 formation. This work provides critical insights into the role of water in enhancing formaldehyde oxidation and offers theoretical support for developing efficient catalysts suitable for humid environments.
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JOURNAL OF ORGANIC CHEMISTRY
·
2017
·
IF 4.849
Xiaoxia Wang,Na Li,Zhongfeng Li,Honghua Rao
A dehydrogenative C(sp2)–N bond-forming strategy via copper-catalyzed intramolecular C–H/N–H coupling has been developed, which systematically unraveled the feasibility and practicality for benzoimdazo[1,2-a]indole formations through oxidative anilidic N–H activation. The merit of this strategy is illustrated by the broad tolerance of functionalities, as well as the utilization of extremely cheap copper catalysis to realize potentially useful indole-fused tetracycles in a step- and atom-economical manner.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 30
·期 1
·647-657
·
IF 2.324
Xiao Tai,Huang Zu-Sheng,Wang Lingyun,Cao Derong
Three novel dithieno[3,2- f :2′,3′- h ]quinoxaline-based organic dyes ( IQ-C, IQ-D and IQ-F ) with three π-spacers were synthesized and developed for dye sensitized solar cells, where dithieno[3,2- f :2′,3′- h ]quinoxaline was used as electron-withdrawing π-spacers, and 2,3-diphenylquinoxaline or dibenzo[ a,c ]phenazine as auxiliary electron-withdrawing π-spacers. The dye IQ-D with 2,3-diphenylquinoxaline as auxiliary electron-withdrawing π-spacer exhibited higher photocurrent ( J sc ) and photovoltage ( V oc ) than that of the dye IQ-C with 2,3-bis(4-(octyloxy)phenyl)quinoxaline as the additional electron-withdrawing π-spacer, due to the larger adsorption amount of IQ-D . The dye IQ-F with a rigid conjugated dibenzo[ a,c ]phenazine as additional electron-withdrawing π-spacer showed the highest efficiency of 6.54% under AM 1.5 G irradiation. It was demonstrated that the π-spacers influence the photovoltaic performance of the dithieno[3,2- f :2′,3′- h ]quinoxaline-based organic dyes significantly. The results indicated that the dyes with three π-spacers are promising candidates for efficient dye-sensitized solar cells.
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