SURFACE & COATINGS TECHNOLOGY
·
2012
·
IF 1.867
Guoxin Hu,Bo Tang,Xia Min
By using layer-by-layer self-assembly technology, multilayered films consisting of alternated humic acid and Fe 3 + ions ((HA/Fe 3 + ) n , n = 10,20,40) were fabricated on alumina fiber (AF) substrate for the first time. FTIR and FESEM results show that the (HA/Fe 3 + ) n thin films were effectively immobilized on the AF surface. The average thickness of a single bi-layer HA/Fe 3 + is not sensitive to the total layers. On the contrary, the concentration of Fe 3 + ions significantly influences this mean thickness. A loose and amorphous structure with some irregular pores was detected from the as-prepared specimens, while relatively smooth surface and denser structure were observed after carbonized at 1000 °C. The large BET surface areas and excellent absorbability of the as-prepared and carbonized samples were found. Moreover, at room temperature, a ferromagnetic property of these samples was revealed by magnetism testing. Due to the adjustable number of layers, the ferromagnetic property is controllable. Therefore, these produces possess potential application as the support material in catalytic and target drug delivery areas.
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POLYMER INTERNATIONAL
·
2011
·Vol. 60
·期 4
·703-710
·
IF 2.056
Zhihong Zhang,Yan Liang,Ping Liang,Chao Li,Shaoming Fang
In order to fabricate a new polymer matrix for application in biochips and to understand the mechanism of adsorption of proteins on conducting polymers, we prepared polypyrrole (PPy) functionalized with ω-( N -pyrrolyl)-octylthiol moieties. The chemical structure of the polymer could be controlled by varying the concentration of pyrrole added as the monomer. Initially, ω-( N -pyrrolyl)-octylthiol was self-assembled into a monolayer on a gold surface. Thereafter, a layer of uniform and smooth PPy was obtained by the chemical copolymerization of pyrrole and the ω-( N -pyrrolyl)-octylthiol. Bovine serum albumin (BSA) adsorption on the polymer was investigated using surface plasmon resonance spectroscopy and cyclic voltammograms. The chemical structure and monomer components of the as-prepared films were characterized using Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Water contact angle measurements were used to assess the surface wettability of the films throughout the preparative procedure. The kinetics of BSA adsorption onto the polymer could be controlled by varying the copolymer thickness and the pH value of the buffer solutions used. Moreover, the electroactivity was changed upon BSA binding. The results suggest that the new conducting polymer may potentially be applied as a more sensitive and reliable matrix in protein sensors. Copyright © 2011 Society of Chemical Industry
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Materials
·
2024
·Vol. 17
·期 12
·2795
·
IF 3.1
Fei Wang,Tiexin Cheng,Guangdong Zhou
Ethanol possesses high economic value, but as an industrial waste, it poses harm to human health and the environment. The paper describes the preparation of a thermoplastic polyurethane-poly(n-isopropylacrylamide) (TPU-PNIPAM) copolymer designed to selectively uptake alcohol in aqueous solution. The material was created by bonding TPU and PNIPAM together through intermolecular hydrogen bonds, enhancing its hydrophobic properties and making it easier to interact with alcohol molecules. As the amount of PNIPAM in TPU increases, the number of hydrophobic isopropyl groups in TPU-PNIPAM also increases, leading to an enhanced selective uptake ability of TPU-PNIPAM for alcohols in aqueous solution. When the temperature reaches 55 °C, the hydrophobic groups in TPU-PNIPAM are more exposed, further enhancing the selective uptake ability of TPU-PNIPAM for alcohols in aqueous solution. TPU-PNIPAM demonstrates selective preferential uptake for various concentrations and types of alcohol in aqueous solutions. The material’s selective uptake performance for alcohols increases with their hydrophobicity, so TPU-PNIPAM exhibited the best adsorption performance for a 10 wt% n-propanol solution under the combined effect of steric hindrance. In addition, TPU-PNIPAM exhibited selective adsorption for other organic solvents, which demonstrated the universality of TPU-PNIPAM in removing contaminants from aqueous solutions.
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Animal Models and Experimental Medicine
·
2024
·
IF 3.8
Xue Wang,Chunyou Ning,Xingyi Cheng,Zhengzhong Wu,Dongbo Wu,Xuemei Ding,Cunxiang Ju,Zhihang Zhou,Lingfeng Wan,Wei Zhao,Peiliang Shi
Background The emerging incidence of pathogenic liver conditions is turning into a major concern for global health. Induction of pyroptosis in hepatocytes instigates cellular disintegration, which in turn liberates substantial quantities of pro-inflammatory intracellular substances, thereby accelerating the advancement of liver fibrosis. Consequently, directing therapeutic efforts towards inhibiting pyroptosis could potentially serve as an innovative approach in managing inflammation related chronic hepatic disorders. Methods GSDMD-NT ki/wt mice and Alb-cre ki/wt mice were generated using CRISPR/Cas9 technology. After crossing the two strains together, we induced conditional cell death by doxycycline to construct a mouse model of liver fibrosis. We analyzed differentially expressed genes by RNA sequencing and explored their biological functions. The efficacy of obeticholic acid (OCA) in the treatment of liver fibrosis was assessed. Results Doxycycline-treated GSDMD-NT ki/wt × Alb-cre ki/wt mice showed severe liver damage, vacuolation of hepatocytes, increased collagen fibers, and accumulation of lipid droplets. The expression of liver fibrosis related genes was greatly increased in the doxycycline-treated mouse liver compared with untreated mouse liver. RNA-sequencing showed that upregulated differentially expressed genes were involved in inflammatory responses, cell activation, and metabolic processes. Treatment with OCA alleviated the liver fibrosis, with reduced ALT and AST levels seen in the GSDMD-NT ki/wt × Alb-cre ki/wt mice. Conclusions We successfully constructed a novel mouse model for liver fibrosis. This GSDMD-NT-induced fibrosis may be mediated by abnormal lipid metabolism. Our results demonstrated that we successfully constructed a mouse model of liver fibrosis, and GSDMD-NT induced fibrosis by mediating lipid metabolism.
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Lubricants
·
2024
·Vol. 12
·期 9
·319
·
IF 3.1
Yaping Xing,Zhiguo Liu,Weiye Zhang,Zhengfeng Jia,Weifang Han,Jinming Zhen,Ran Zhang
In this study, MoS2nanosheets have been prepared and treated ultrasonically with silver ammonia solutions. The MoS2/Ag precursor was reduced using dopamine (DA) as reducing and linking agent at room temperature, and it was subjected to a hydrothermal treatment to produce MoS2/Ag nanocomposites (denoted as MoAg). The MoAg samples were functionalized with N-oleoylethanolamine to improve dispersion in the base oil component of additives. Use of the functionalized MoAg (denoted as Fc-MoAg) as a lubricant additive for steel balls resulted in effective friction reduction and anti-wear. This work avoids ion exchange during exfoliation, and the Ag+has been reduced to nano-silver particles by dopamine to enlarge the layer spaces of MoS2. Taking the case of lubrication with base oil containing Fc-Mo0.6Ag15, the wear scar diameters and coefficients of friction of the steel balls were 0.428 and 0.098 mm, respectively, which were about three-fifths base oil. In addition, MoS2/Cu and MoS2/Ni nanocomposites were synthesized and the tribological properties associated with steel/steel balls assessed. The results demonstrate that all MoS2/metal composites exhibit enhanced tribological behavior in the steel/steel pair tests. Both nanocomposite synergy and the tribofilm containing sulfide, oxide, carbide, and other compounds play important roles in achieving reduced friction and improved anti-wear. The friction and wear properties of base oil containing Fc-MoAg and commercial additives were evaluated using a four-ball wear tester with steel/steel, steel/zirconia and zirconia/zirconia pairs. The base oil containing Fc-MoAg delivered smaller coefficients of friction (COFs) and/or scarring groove depths than those observed with the use of pure base oil and base oil containing commercial additives.
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Molecular Catalysis
·
2024
·
IF 3.9
Yi He,Peng Bai,Shibo Yuan,Jiafa Chen,Yicheng Zhao,Yongdan Li
N -formylation of amines with CO 2 is a promising approach to high-efficient utilization of CO 2 as C1 feedstock, while conventional thermocatalytic processes suffer from harsh reaction condition and intense energy consumption. In this work, photocatalytic N -formylation of amines with CO 2 is achieved at room temperature over Pt-Bi/CeO 2− x composite catalyst. The Pt-Bi bimetallic sites increase the concentration of surface oxygen vacancies. Furthermore, the synergistic effects of Pt and Bi improve the light absorption capacity, reduce the band gap energy of the photocatalyst and promote the separation of photoinduced charge carriers. Using PhSiH 3 as the reducing agent, the conversion of N -methylaniline reaches 100 % after 3 h irradiation in N, N -dimethylformamide solvent with a N- methylformanilide selectivity of 90.8 %. The composite photocatalyst shows promising cycling stability and universality.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Hua Wang,Yunchuan Tu,Sijun Li,Yimin Jiang,Niandan Zhao,Wenbin Wang,Wei Shen,Ming Li,Rongxing He
Efficient electrocatalytic co-reduction of CO 2 and NO 3 − to urea involves simultaneous generation and stabilization of C- and N-coupling intermediates. Herein, we report positive feedback at the interfaces of an AuPd/SnO x catalyst that enables generation and stable co-adsorption of *CO and *NH 2 OH at low-potential, fostering efficient C-N coupling for urea formation. A combination of in-situ spectroscopic analyses and theoretical calculations show that *CO 2 captures electrons by bonding to the AuPd/SnO x interface, leading to positively charged Pd sites, which promote the NO 3 RR to give the key N-intermediate *NH 2 OH. The adsorbed *NH 2 OH provides electron feedback to the catalyst surface , which not only enhances the adsorption of CO 2 and promotes the conversion of *CO 2 to *CO to accelerate the CO 2 RR, but also enhances the adsorption strength of the catalyst for *CO. Owing to this positive feedback, the Faraday efficiency and yield of urea reached 21.3 % and 1280.5 μg∙h −1 ∙mg −1 at −0.2 V (versus the relative hydrogen electrode), surpassing the performance of most previously reported catalysts. This finding provides new insights into catalyst design for advancing C-N coupling systems.
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PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
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2024
·
IF 4.2
Ming Liu,Qianwen Wang,Bin Lai,Yan Chen,Rongchumu Ge,Shuo Yan,Chunya Bu
β- N -acetylhexosaminidases (HEXs) are key chitin-degrading enzymes in insects. Here, we identified TuHex1 and TuHex2 using insect orthologous genes by searching Tetranychus urticae genome and transcriptome database to investigate their roles in mite molting. TuHex1 and TuHex2 expression was induced by 20-hydroxyecdysone (20E), and inhibition of TuHex1 and TuHex2 expression by RNAi resulted in wrinkled cuticle or an inability to shed the old cuticle in nymphs, which may be due to a reduction in particle deposition in the exocuticle and lamellar structure in the endocuticle as revealed by scanning electron microscopy and transmission electron microscopy. The results suggest that the TuHex1 and TuHex2 genes play an essential role in the molting and developmental process of the mite. TuHex2 , with a mortality rate of 67.41 % in the leaf disc assay, was a potential RNAi target by oral feeding. Spraying of nanocarrier-delivered bacteria expressing ds TuHex2 at 500 ng/μL kept spider mites at a consistently low level throughout the 14 days and showed good mite control comparable to that of matrine. In addition, nanocarrier-delivered ds TuHex2 is safe for Neoseiulus californicus in our experiments, providing its potential for green mite management.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Zhiyue Cui,Hongli Fang,Xinyu Wei,Shu He,Wei Shao
Stimuli-responsive hydrogels have great prospects in many applications such as soft robots, smart actuators, and bionic devices. Among them, stimuli-responsive hydrogels as actuators possessing rapid responsiveness and tunable actuation remain challenging. In this work, asymmetric hydrogels with temperature and NIR light dual-responsive actuation were prepared by introducing polydopamine-modified molybdenum disulfide (PDA-MoS2) nanosheets into in situ polymerization of N-isopropylacrylamide (NIPAM) monomers by the gravity-induced deposition method. The PDA-MoS2 nanosheets existing in the PNIPAM hydrogels had synergistic reinforcing NIR light responsiveness, making the prepared hydrogel exhibit a fast bending ability that it could bend to 249° in 17 s. The hydrogel showed excellent bending performance with a bending angle of 601° in 16 s in 55 °C water. On this basis, several biomimetic actuators, including the catch-release of a smart gripper, the opening and closing of a hydrogel flower, and the bending of butterfly tentacles and light-driven circuit switches were developed. In addition, smart devices such as information-hiding materials and fluid valves were constructed through the combination of temperature and NIR light dual-responsiveness. These dual-driven asymmetric hydrogels provide ideas for the design and development of smart actuators and broaden the application of hydrogel actuators in the emerging fields of soft robotics, biomedical engineering, and bionic devices.
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ChemistrySelect
·
2024
·Vol. 9
·期 22
·e202401690
·
IF 1.9
Menghan Xue,Fazhan Li,Zhen Li,Yuxia Sun,Yiping Guo,Yuehui Li
Graphical Increase of graphitic-N doping and graphitization degree of outside shells encapsulating Ni nanoparticles was developed to efficiently promote cathodic reduction of CO 2 to CO. Despite of high conductivity and reducing ability, transition metal nanoparticles tend to aggregate and unavoidably impact the selectivity during the proton-coupled reduction process of CO 2 RR. New strategy to regulate and utilize the electronic property of transition-metal particles allows for effective tuning of eCO 2 RR activity. Through simple creation of N-doped carbon shells surrounding Ni nanoparticles and controlling the amount and arrangement of the N atoms, successful and long-lasting electrochemical reduction of CO 2 was accomplished. The inherent HER activity was almost completely suppressed. It exhibited FE CO above 90 % in a 500 mV potential window, with the optimal up to 96.5 % at −0.78 V vs RHE. In flow cell electrolysis, a current density of 289.4 mA/cm 2 was achieved with Faradic efficiency of 96.4 % towards CO. The results of control experiments using different catalysts imply that electron transfer between Ni core and shells was significantly influenced by the property of N atoms. High content of graphitic nitrogen is crucial for the catalytic performance.
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BIOMASS & BIOENERGY
·
2024
·
IF 5.8
Chenglong Wen,Shuning Li,Peng Zhang,Mohong Lu,Jie Zhu,Mingshi Li,Chunshan Song
A series of Mo 2 N particles supported on nitrogen-doped carbon (Mo 2 N@NC) catalysts for guaiacol hydrodeoxygenation were synthesized in situ through a one-step method employing dopamine as C and N resources and ammonium molybdate as Mo resource, respectively. During synthesis, molybdate ions are adsorbed on dopamine because of a complexation between them; then dopamine/molybdate ions/TMB/F127 nanoemulsions are formed. After polymerization, growth, drying, and carbonization , Mo 2 N particles supported on nitrogen-doped carbon catalysts are obtained. Because of the interaction between Mo and N, Mo 2 N particles are anchored onto the support, preventing the aggregation of Mo 2 N during carbonization. As a result, ultrafine Mo 2 N particles with a size of 1.0–1.3 nm are highly dispersed on Mo 2 N@NC catalysts. The guaiacol hydrodeoxygenation for these Mo 2 N@NC catalysts was performed at 280–380 °C, a H 2 flow rate of 80 mL/min and different pressures and weight hourly space velocities. Among them, Mo 2 N@NC with a Mo 2 N loading of 40 % presents the highest guaiacol conversion (99.9 %) and aromatic hydrocarbon selectivity (80.2 %), which is also better than Mo 2 N/C with a Mo 2 N loading of 40 % prepared by the wet impregnation method.
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ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2025
·Vol. 47
·期 8
·1-20
·
IF 3.8
Hu Zhengchun,Huang Xinrui,Shen Wu,Guo Minghao,Liao Bing
Leakage and migration of landfill leachate are often accompanied by complex biogeochemical processes that form a continuous series of redox zones in the leachate plume. Nitrogen in leachate, especially NH 4 ⁺-N, is one of the most important pollutants contributing to groundwater contamination. While traditional landfill pollution prevention and control measures often have difficulty effectively addressing the complex migration and transformation behaviors of NH 4 ⁺-N in leachate, an in-depth study of the migration and transformation processes of NH 4 ⁺-N in the redox compartment is crucial for the development of accurate and efficient pollution prevention and control strategies. In this study, static transformation experiments, dynamic simulated column experiments and high-throughput sequencing techniques were used to systematically investigate the migration and transformation processes of NH₄⁺-N in the redox bands of a simulated landfill. The results showed that in the NH 4 ⁺-N transformation experiment, the soil in the simulated oxidation zone had the strongest ability to transform NH 4 ⁺-N, with the NH 4 ⁺-N concentration decreasing from 40 to 0.03 mg/L, whereas the sterilization treatment completely suppressed the transformation process of NH 4 ⁺-N in the OZ. The NH 4 ⁺-N in the continuous redox zone completely penetrated the simulated soil column on the 7th day, and the maximum effluent concentration was stable in the range of 1530 ± 30 mg/L. The trends of NH 4 ⁺-N in each independent redox zone were consistent, with the TZ having the richest microbial community abundance and number of species, and some Acidobacteria were able to reduce Fe(III) under anoxic conditions and interact with the organic matter, which effectively contributed to the cycling of Fe within the TZ. These findings indicate that there are significant differences in the biogeochemical cycling process of NH 4 ⁺-N in different redox zone environments, and this study provides a new research perspective for a deeper understanding of the biogeochemical cycling mechanism of the elements in landfills and an important scientific basis for the prevention, control, and remediation of landfill pollution.
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