JOURNAL OF POLYMER ENGINEERING
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2017
·Vol. 38
·期 4
·323-331
·
IF 0.658
Xiaobo Shu,Liping Wan,Mubai Duan
Clay hydration and swelling can cause shale instability in the drilling of oil and gas wells. The persistent inhibition performance of polyether amine (PEA) and poly(vinyl alcohol- g -dimethyl aminopropyl methacrylamide) (PVA- g -DMAPMA) as amine clay inhibitors has been investigated through hot rolling dispersion test, bulk hardness test, and bentonite inhibition test. The micro-mechanism has also been explained by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscope (SEM), and X-ray diffraction (XRD) analyses. Through the interaction of PEA and PVA- g -DMAPMA, the PEA can enter into clay platelets to exclude water molecules from entering and hydrating the clay, and the PVA- g -DMAPMA can affect the surface of clay minerals to prevent further intrusion of water molecules. Due to the effect of multiple cationic sites, both PEA and PVA- g -DMAPMA can maintain persistent clay inhibition and are less susceptible to reversing the adsorption.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Zijian He,Nian Li,Yunan Wu,Huajie Lai,Bo Liu,Tao Jin
The significance of photocatalysts in scientific research cannot be contested. Enhancing the photocatalytic efficiency is contingent upon catalyst structure design and synthesis strategies that enhance the separation and migration of photogenerated charge carriers. In this study, we utilized the paraffin–water interface as a protective shield for TiO2 and employed in situ photopolymerization to prepare composite photocatalysts with a distinctive “Flake-like Janus” (FLJanus) structure. The FLJanus structured is composed of a layer of nanosized TiO2 and a layer of conjugated polymer. We conducted a series of comparisons between the FLJanus structured photocatalyst and a randomly structured photocatalyst prepared under the same conditions. The FLJanus structured photocatalysts exhibit a 126% enhancement in the degradation efficiency of benzotriazole (BTA) compared to the randomly structured photocatalyst. Under simulated sunlight, the best photocatalyst we tested achieved a 90% degradation of BTA within 1 h. The photocurrent results showed that the FLJanus structured photocatalyst exhibited a two-fold increase in photocurrent, while the fluorescence spectra (photoluminescence) indicated a lower fluorescence emission peak, suggesting an enhanced efficiency in photogenerated charge carrier separation. By electron paramagnetic resonance tests and the analyzing of band structure, the electron-transfer mechanism of the Janus composite catalyst was determined in greater detail, indicating that the FLJanus structure had a decisive impact on the spatial charge separation ability of photocatalyst particles. This research shows an inexpensive and scalable preparation method for improving the efficiency of photocatalysts.
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COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Huaiyu Dong,Shuailong Gao,Chen Yu,Zhichen Wang,Yixing Huang,Tian Zhao,Ying Li
Despite numerous reports on microwave absorbing materials and structures with excellent performance, research on the impact of the carrier of microwave absorbers and their preparation processes on microwave absorption performance still faces challenges. To address this issue, this study combines theoretical analysis, simulation, and experimental validation to compare the differences in microwave absorption performance between 3D printed ABS/CF/MWCNTs materials and traditionally cast paraffin/CF/MWCNTs materials. Furthermore, the study explores the impact of linear and concentric filling patterns in 3D printing processes on the performance of tree-shaped microwave absorbing meta-structures. From a material level perspective, the 3D printed ABS/CF/MWCNTs composite plate with a thickness of 3 mm has an effective absorption bandwidth of 5.16 GHz. Additionally, the bio-inspired tree-shaped structure optimized by the ant colony algorithm achieves an effective absorption bandwidth of up to 11.5 GHz at a thickness of 10.8 mm, with a minimum reflection loss of less than −9 dB across the entire frequency range (2–18 GHz). Moreover, the microwave absorbing meta-structure reinforced with carbon fiber-reinforced plastic laminates exhibits outstanding tensile and bending strength, with an average tensile strength and bending strength reaching 197.7 MPa and 188.6 MPa, respectively. In summary, this study provides valuable insights into the optimization of preparation processes for microwave absorbing materials or structures and offers a scientific basis for the design and application of high-performance microwave absorbing materials.
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EUROPEAN JOURNAL OF PHARMACOLOGY
·
2024
·
IF 4.2
Wenyuan Yu,Jianghuiwen Lu,Xinqi Huang,Huiru Zhuang,Yumei An,Mingyang Zhang
Background Effective drugs for preventing or treating skin flap necrosis remain elusive. In this study, we investigated the potential protective effect of exendin-4 against skin flap ischemia-reperfusion injury (IRI) through the inhibition of ferroptosis. Method A rat abdomen was constructed with an island skin flap, and the superficial vascular pedicle of the abdominal wall was closed using a vascular clamp, which was removed after 8 h. Before surgery, RSL3 and ferrostatin-1 solutions were intraperitoneally injected. After the surgery, subcutaneous injections of exendin-4 were administered daily. The number of inflammatory cells, mean vascular density, collagen fiber content, and apoptosis and ferroptosis indicators were quantified 24 h after reperfusion. Survival, contraction rate, and blood perfusion of the skin flap were evaluated on days 1, 3, 5, and 7 after reperfusion. Results The flap survival rate was significantly higher in the exendin-4 group than that in the injury group, whereas the contraction rate was lower. Compared with the injury group, the exendin-4 group showed less inflammatory cell infiltration, higher vascular density, and less collagen fiber loss. At the molecular level, the exendin-4 group demonstrated opposite or elevated expression of apoptosis and ferroptosis indicators than those in the injury group, with significantly increased glutathione peroxidase 4 (Gpx4). Ferroptosis inhibitors and agonists enhanced and reversed the protective effects of exendin-4, respectively. Conclusion Exendin-4 alleviates skin flap IRI by upregulating Gpx4 expression to inhibit ferroptosis. Therefore, exendin-4 may serve as a novel clinical treatment for skin flap IRI.
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Journal of Materials Chemistry A
·
2025
·Vol. 13
·期 8
·5882-5897
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IF 9.5
Siyue Hui,Huanzhi Zhang,Guangpeng Xu,Junhao Zhang,Fen Xu,Lixian Sun,Xiangcheng Lin,Lei Ma,Hongliang Peng,Bin Li,Erhu Yan,Federico Rosei
Thermal insulation and temperature control are extremely important in numerous human activities. Traditional aerogels with low thermal conductivity are known to facilitate good insulation. Boron nitride (BN) aerogels consist of nanoscale nanofiber units with plentiful porous structures, possessing excellent thermal/electrical insulation and chemical stability. However, these porous materials cannot effectively block heat transmission, despite their low thermal conductivity. Therefore, it is necessary to develop a new insulation strategy and explore materials with excellent thermal insulation performance, with special attention to heat transmitted not only through air, but also through thermal regulation by thermal adsorption. Phase change materials (PCMs) are considered promising latent heat storage materials due to their large heat storage capacity, making them promising candidates for highly efficient thermal insulation. However, the flammability of organic PCMs and their susceptibility to leakage during the solid-to-liquid transition seriously limit their wide application. In this study we combined the dual-thermal insulation performance of BN fiber aerogels and PCMs and constructed novel flexible and multifunctional composites with excellent thermal insulation performance using Co-MOF nano-flower cross-linked BN aerogels as interconnected porous substrates to encapsulate paraffin wax (PW) PCMs. The composites exhibited the advantages of BN, Co-MOFs and PCMs, overcoming the drawbacks of single-component materials. The results showed that the latent-heat storage capacity of the BN/Co-MOF/PW composites reached 188.11 J g−1 and the resulting thermal conductivity was as low as 0.0397 W (m−1 K−1), due to high thermal insulation performance. The morphology, flexibility, mechanical performance, and flame retardancy of the constructed BN/Co-MOF/PW composites were systematically investigated, ensuring that the composites could be used for thermal insulation and flame-retardant applications.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2024
·
IF 4.3
Man Mohan,Sheetal Kumar Dewangan,K. Raja Rao,Kwan Lee,Byungmin Ahn
This research article presents a comprehensive study on the prediction of thermal conductivity (TC) as a primary outcome for an artificial neural network (ANN) model in the context of nanoenhanced phase change materials (NEPCMs). To improve predictive accuracy and to reduce variation within the NEPCM dataset, a targeted dataset was employed, consisting exclusively of NEPCMs synthesized using paraffin wax (PW) and metal oxide nanoparticles. Unlike existing empirical models that predict TC of NEPCM without simultaneously considering multiple factors influencing it, this study integrates multiple factors, providing a more accurate prediction of NEPCM thermal conductivity. Additionally, the study explores the impact of synthesis parameters on the thermal performance of NEPCMs, focusing on the examination of factors such as the melting temperature of pure phase change material (PCM), nanoparticle size, and NEPCM composition. The thermal characterizations demonstrate outstanding thermophysical properties in NEPCMs, particularly in terms of thermal conductivity, phase change enthalpy, and thermal stability compared to their respective base PCM. An ANN TC prediction model demonstrates exceptional correlation (>99%) with reported NEPCMs, providing a reliable tool for TC forecasting in similar NEPCM categories. The backpropagation ANN model predicts NEPCM TC with a mean squared error (MSE) of 0.031124 within eight epochs. The dataset used exhibits high fit values, with -values of 0.99825, 0.99208, and 0.9824 for training, validation, and testing, respectively. These values closely match experimentally determined TC, with less than 4% error.
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Drug Design Development and Therapy
·
2024
·
IF 4.7
Yu Li,Guangren Yue,Shuying Yu,Zheng Liu,Yilin Cao,Ximei Wang
Introduction Autologous stem cell transplantation has emerged as a promising strategy for bone repair. However, the osteogenic potential of mesenchymal stem cells derived from diabetic patients is compromised, possibly due to hyperglycemia-induced senescence. The objective of this study was to assess the preconditioning effects of extracellular vesicles derived from H2O2-stimulated adipose-derived stem cells (ADSCs) and non-modified ADSCs on the osteogenic potential of diabetic bone marrow mesenchymal stem cells (BMSCs).Methods Sprague-Dawley (SD) rats were experimentally induced into a diabetic state through a high-fat diet followed by an injection of streptozotocin, and diabetic BMSCs were collected from the bone marrow of these rats. Extracellular vesicles (EVs) were isolated from the conditioned media of ADSCs, with or without hydrogen peroxide (H2O2) preconditioning, using density gradient centrifugation. The effects of H2O2 preconditioning on the morphology, marker expression, and particle size of the EVs were analyzed. Furthermore, the impact of EV-pretreatment on the viability, survivability, migration ability, osteogenesis, cellular senescence, and oxidative stress of diabetic BMSCs was examined. Moreover, the expression of the Nrf2/HO-1 pathway was also assessed to explore the underlying mechanism. Additionally, we transplanted EV-pretreated BMSCs into calvarial defects in diabetic rats to assess their in vivo bone formation and anti-senescence capabilities.Results Our study demonstrated that pretreatment with EVs from ADSCs significantly improved the viability, senescence, and osteogenic differentiation potential of diabetic BMSCs. Moreover, in-vitro experiments revealed that diabetic BMSCs treated with H2O2-activated EVs exhibited increased viability, reduced senescence, and enhanced osteogenic differentiation compared to those treated with non-modified EVs. Furthermore, when transplanted into rat bone defects, diabetic BMSCs treated with H2O2-activated EVs showed improved bone regeneration potential and enhanced anti-senescence function t compared to those treated with non-modified EVs. Both H2O2-activated EVs and non-modified EVs upregulated the expression of the Nrf2/HO-1 pathway in diabetic BMSCs, however, the promoting effect of H2O2-activated EVs was more pronounced than that of non-modified EVs.Conclusion Extracellular vesicles derived from H2O2-preconditioned ADSCs mitigated senescence in diabetic BMSCs and enhanced their bone regenerative functions via the activation of the Nrf2/HO-1 pathway.
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THERMOCHIMICA ACTA
·
2025
·
IF 3.5
Xiangyun Kong,Jinge Lu,Mengkun Xu,Mengyuan Song,Keqing Li,Wenshuai Qiu,Jiali Zhang,Xi Chen,Yongxin Liu
A novel and simple one-step method was proposed for the preparation of multifunctional microencapsulated phase change materials to satisfy the requirements of different application scenarios. Here, with the help of the super reaction ability and coordination effect of metal ions Zn 2+ , the paraffin (PCM) was well encapsulated by the sodium alginate (SA) shell by the cross-linking between SA and Zn 2+ . At the same time, Na 2 S·9H 2 O and 2-MeIM were selected to realize the loading of ZnS quantum dots and ZiF-8 in the materials by their coordination with excess Zn 2+ in the system. The results of differential scanning calorimeter (DSC), Ultraviolet-visible-near-infrared (UV–vis-NIR), Photoluminescence and Brunauer–Emmett–Teller (BET) indicated that the obtained PCM@SA/ZnS and PCM@SA/ZiF-8 not only retained good heat resistance and heat storage properties, but also had new functions such as fluorescence and adsorption. This work would provide a new idea for the development of multi-functional composite materials.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2024
·
IF 3.7
Donghai Yang,Mofan Li,Qing Yun,Huayao Sun,Qing Li,Xuedong Gao,Chaohui Chen,Limin He
Electrocoalescence technology can efficiently dehydrate waxy crude oil but the mechanisms are still unclear. Herein, the continuous microscopic behaviors of droplet falling, deformation, and coalescence were experimentally investigated to clarify the dynamic response mechanism of droplet in waxy oil under an electric field. The results showed the droplet falling under both gravity and electrostatic attraction to deform by the electric field force. Moreover, the expansion and clamping of the liquid bridge resulted from the competition between electric field force and capillary force. However, the precipitated wax crystals reduced the kinetic energy of the droplet and affected its external circulation, thus delaying the falling time. In addition, the wax crystals with interfacial activity adsorbed on the oil-water interface and cross-linked to form a spatial network structure, thereby weakening droplet deformation, hindering liquid film drainage, and inhibiting liquid bridge expansion. Importantly, the droplet adsorbed wax crystals exhibited interfacial elasticity, which makes them more inclined to partial coalescence. The low-frequency pulsed direct current (PUDC) electric field with high strength intermittent effect displayed the most obvious inhibition effect on the wax crystals. Overall, these findings look promising for future design and optimization of high-efficiency electric dehydrators and related fields.
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MOLECULES
·
2024
·Vol. 29
·期 14
·3307
·
IF 4.2
Yingbiao Xu,Li Cheng,Yefei Wang,Han Jia
Nanoparticles have been widely applied to treat emulsion-containing wastewater in the form of chemical demulsifiers, such as SiO2, Fe3O4, and graphene oxide (GO). Owing to their asymmetric structures and selective adsorption, Janus nanoparticles show greater application potential in many fields. In the present work, the novel magnetic Janus graphene oxide (MJGO) nanoparticle was successfully prepared by grafting magnetic Fe3O4to the surface of the JGO, and its demulsifying ability to treat a crude oil-in-water emulsion was evaluated. The MJGO structure and its magnetic intensity were verified by Fourier-transform infrared spectra (FTIR), transmission electron microscopy (TEM), X-ray diffraction (XRD), and magnetization saturation (MS) tests. Compared with GO and JGO, MJGO displayed the superior efficiency (>96%) to demulsify the crude oil-in-water emulsion, which can be attributed to the reduced electrostatic repulsion between MJGO and the emulsion droplets. Furthermore, the effects of pH and temperature on the demulsification performance of MJGO were also studied. Lastly, the recyclability of MJGO largely reduced the cost of demulsifiers in separating crude oil and water. The current research presents an efficient and recyclable demulsifier, which provides a new perspective for the structural design of nanomaterials and their application in the field of demulsification.
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TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Mohan Li,Shupei Liu,Mingmei Cao,Zheng Zhou,Jinsong Rao,Yuxin Zhang
In this study, fluorosilane-modified hollow mesoporous Diatom biosilica oil-carrying microcapsules (Oil@HMSNs/DE-F) were successfully synthesized using diatomite as hard-template, and dimethylsiloxane oil and hollow mesoporous silica as the core materials. Such microcapsules exhibited high oil-carrying capacity (41 %) and oil-carrying stability, which significantly higher than the Oil@DE-F microcapsules (33 %) (Comparison). Tribological tests showed that the Oil@HMSNs/DE-F composite coatings have excellent tribological properties and mechanical properties. Amazingly, 6 wt% Oil@HMSNs/DE-F epoxy composites coatings reduced the coefficient of friction by 79.9 % and the wear rate by 98.1 % compared to pure epoxy.
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Advanced Science
·
2024
·Vol. 11
·期 42
·2407543
·
IF 14.3
Simin Bi,Jianpeng Ao,Ting Jiang,Xianmiao Zhu,Yimin Zhu,Weibing Yang,Binglian Zheng,Minbiao Ji
Water plays a vital role in the life cycle of plants, participating in various critical biochemical reactions during both non-photosynthetic and photosynthetic processes. Direct visualization of the metabolic activities of water in plants with high spatiotemporal resolution is essential to reveal the functional utilization of water. Here, stimulated Raman scattering (SRS) microscopy is applied to monitor the metabolic processes of deuterated water (D 2 O) in model plant Arabidopsis thaliana (A. thaliana) . The work shows that in plants uptaking D 2 O/water solution, proton-transfer from water to organic metabolites results in the formation of C-D bonds in newly synthesized biomolecules (lipid, protein, and polysaccharides, etc.) that allow high-resolution detection with SRS. Reversible metabolic pathways of oil-starch conversion between seed germination and seed development processes are verified. Spatial heterogeneity of metabolic activities along the vertical axis of plants (root, stem, and tip meristem), as well as the radial distributions of secondary growth on the horizontal cross-sections are quantified. Furthermore, metabolic flow of protons from plants to animals is visualized in aphids feeding on A. thaliana . Collectively, SRS microscopy has potential to trace a broad range of matter flows in plants, such as carbon storage and nutrition metabolism.
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