查找使用阿拉丁产品的科研文献

Synthesis and characterization of PVA/KC/NaYF4:Eu3+ composite fluorescent films

Xiangyuan Duan,Shuyan Xu

Fluorescent composite films were prepared using polyvinyl alcohol (PVA) as the substrate and NaYF 4 :Eu 3+ phosphors and κ-carrageenan powder (KC) as the fillers by the casting method. The impact of incorporating NaYF 4 :Eu 3+ on the structural, morphological, mechanical property, thermal stability, and optical characteristics of PVA/KC films was examined. The incorporation of KC promoted the formation of hydrogen bonds between KC and PVA. Consequently, the water contact angle of the films increased by approximately 10°, indicating improved water resistance. Meanwhile, the incorporation of NaYF 4 :Eu 3+ increased the thermal stability of the films, with the temperature at 5% mass loss rising by approximately 13°C. Additionally, the mass retention at 600°C improved by 3.47%. Notably, the addition of NaYF 4 :Eu 3+ had a negligible effect on the transparency of the films while imparting fluorescent properties. Under UV excitation at 395 nm, the films exhibited maximum fluorescence intensity at 616 nm, indicating a significant fluorescence effect.

Kelp-derived Cu-Fe3C@KC nanoclusters for microwave-assisted catalytic dye degradation

Mengqiao Li,Liang Chen,Jing Sui,Geoffrey I.N. Waterhouse,Zhiming Zhang,Liangmin Yu

The rapid growth of the dyeing and printing industry has resulted in severe water pollution, posing significant threats to human health and ecosystems. To effectively tackle this challenge, this study presents a novel approach using marine biomass-derived carbon (kelp) combined with Prussian blue (FeCu-PBA) to synthesize carbon-based nanoclusters (Cu-Fe 3 C@KC) for efficient microwave-assisted degradation of high-concentration dyes. By optimizing the FeCu-PBA-to-kelp mass ratio (FeCu/KC), we tailored the material’s morphology and enhanced its microwave absorption properties, achieving rapid and effective dye degradation. Experimental results demonstrate that Cu-Fe 3 C@KC-3 degraded methyl orange, methylene blue, crystal violet, and rhodamine B with efficiencies of 99.37 %, 96.23 %, 94.67 %, and 99.77 %, respectively, within just 4 min. Mechanistic studies, including free radical capture experiments and electron paramagnetic resonance (EPR) analysis, revealed that superoxide radicals ( O 2 − ), holes (h + ), electrons (e − ), and hydroxyl radicals ( OH) were the primary reactive species in the degradation process, with OH playing a dominant role due to its strong oxidative capacity. This research highlights the dual advantages of Cu-Fe 3 C@KC-3: superior catalytic performance and cost-effectiveness. The innovative use of kelp as a precursor provides a sustainable and economical pathway for the large-scale treatment of dye-laden wastewater, addressing critical environmental challenges with significant practical implications.

Effect of ash participation on the catalytic activity of as-prepared catalysts to promote diesel soot combustion

Chengcheng Yi,Jia Fang,Xilong Xu,Kejian Wang,Zinong Zuo,Zhiqiang Han

This paper studies the effects of ash species and ash aging deposition on the physical and chemical properties of KC catalysts. By thermogravimetric analysis (TGA), the pure KC catalyst has good stability and catalytic activity at 600 °C. In the loosely contacting soot particles (PU)/ash/KC mixtures, the negative effect of ash on KC catalytic soot oxidation is relatively weak. The addition of ash makes the active site areas between PU and KC catalyst lose contact without changing the physicochemical properties of the catalyst. By contrast, the ash aging deposition on KC at 400 °C has an obviously negative effect on the soot combustion catalyzed by KC, because ash aging deposition leads to enormous changes in the chemical properties and catalytic activity of KC. This finding is consistent with characterization analyses such as XRD , SEM, XPS and Raman. Ash aging deposition destroys the KC structure and reduces the activity of KC to catalyze soot oxidation, and CaSO 4 has the greatest effect on the oxidation activity. Consequently, ash aging deposition causes structural property damage of as-prepared catalysts, leading to the failure of CDPF catalytic layer. This study provides a new idea for the selection and optimization strategy of catalysts in CDPF.

MicroRNA-155 Participates in Smoke-Inhalation-Induced Acute Lung Injury through Inhibition of SOCS-1

Yue Zhang,Yifang Xie,Leifang Zhang,Hang Zhao

Smoke inhalation causes acute lung injury (ALI), a severe clinical disease with high mortality. Accumulating evidence indicates that microRNA-155 (miR-155) and suppressor of cytokine signaling 1 (SOCS-1), as mediators of inflammatory response, are involved in the pathogenesis of ALI. In this paper, we explored the proinflammatory mechanism of miR-155 in smoke-inhalation-induced ALI. Our data revealed that smoke inhalation induces miR-155 expression, and miR-155 knockout (KO) significantly ameliorates smoke-inhalation-induced lung injury in mice. Neutrophil infiltration and myeloperoxidase (MPO), macrophage inflammatory protein 2 (MIP-2) and keratinocyte chemoattractant (KC) expressions were decreased in miR-155–/–mice after smoke inhalation as well. Real-time RT-PCR and immunoblotting results showed that SOCS-1 level was remarkably increased in miR-155–/–mice after smoke exposure. Furthermore, the experiments performed in isolated miR-155 KO pulmonary neutrophils demonstrated that the lack of SOCS-1 enhanced inflammatory cytokines (MIP-2 and KC) secretion in response to smoke stimulation. In conclusion, smoke induces increased expression of miR-155, and miR-155 is involved in inflammatory response to smoke-inhalation-induced lung injury by inhibiting the expression of SOCS-1.Keywords:acute lung injury;neutrophils;microRNA-155;suppressor of cytokine signaling-1

Flexible Strain Sensor Based on Conductive Hydrogel/KC@PDMS for Neck Motion Control Wheelchair Using EMD-LSTM Algorithm

Xiaoming Wang,Longbo Xiong,Wentao Dong,Zhilong Guo,Yifeng Huang,Daojin Yao

Flexible Aluminum-Air Battery Based on High-Performance Three-Dimensional Dual-Network PVA/KC/KOH Composite Gel Polymer Electrolyte

Chang Zou,Li Chen,Qingye Liu,Wei Lu,Xueyan Sun,Jun Liu,Yuan Lei,Wei Zhao,Yilun Liu

With a large theoretical capacity and high energy density, aluminum-air batteries are a promising energy storage device. However, the rigid structure and liquid electrolyte of a traditional aluminum-air battery limit its application potential in the field of flexible electronics, and the irreversible corrosion of its anode greatly reduces the battery life. To solve the above problems, a PVA/KC/KOH (2 M) composite gel polymer electrolyte (GPE) with a three-dimensional dual-network structure consisting of polyvinyl alcohol (PVA), kappa-carrageenan (KC), and potassium hydroxide was prepared in this paper by a simple two-step method and applied in aluminum-air batteries. At room temperature, the ionic conductivity of the PVA/KC/KOH (2 M) composite GPE was found to be up to 6.50 × 10–3 S cm–1. By utilizing this composite GPE, a single flexible aluminum-air battery was assembled and achieved a maximum discharge voltage of 1.2 V at 5 mA cm–2, with discharge time exceeding 3 h. Moreover, the single flexible aluminum-air battery maintains good electrochemical performance under various deformation modes, and the output voltage of the battery remains at about 99% after 300 cycles. The construction of flexible aluminum-air batteries based on a three-dimensional dual-network PVA/KC/KOH composite GPE provides excellent safety and high-multiplication capabilities for aluminum-air batteries, making them potential candidates for various flexible device applications.

Biological interface engineering of HMX/KC-CTS/NTO core-shell composites: Ternary synergistic optimization of mechanical sensitivity, thermal stability and energy release efficiency

Zhiqiang Wang,Xu Zhou,Tian Ma,Jinjiang Xu

A novel 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX) based energetic composite material was synthesized. With ultrafine NTO as the shell, the sensitivity of HMX was reduced and the thermal stability was enhanced while ensuring the detonation performance. In addition, biomass κ-carrageenan (KC) and chitosan (CTS) were used as coatings to synergistically improve the interfacial interaction of energetic materials and promote the energy release efficiency of HMX. Specifically, HMX/KC-CTS/NTO composites increase the β-δ phase transition temperature of HMX by 13.3 °C. The overall combustion rate of HMX/KC-CTS/NTO increased by 23.3 %, the maximum flame combustion rate increased by 62.7 %, and the combustion area increased by 228.9 %. Compared with HMX (IS = 6J, FS = 100 N), the impact sensitivity of HMX/KC-CTS/NTO (IS = 15 J, FS = 260 N) is significantly reduced due to the perfect and dense ultrafine-NTO coating on the surface of HMX particles. Finally, the formation mechanism of HMX/KC-CTS/NTO composites was revealed by DFT calculation.

Soybean oil containing ginseng saponins as adjuvants promotes production of cytokines and enhances immune responses to foot-and-mouth disease vaccine

Cenrong Zhang,Wei Xu,Jian Chen,Ran Guan,Shicheng Bi,Haibo Jin,Xuemei Cui,Fushan Shi,Songhua Hu

In the present study, the adjuvant effect of soybean oil containing ginseng root saponins (SO-GS-R) on the immune response to foot-and-mouth disease vaccine (FMDV) in mice was investigated. When immunized with FMDV antigen emulsified in an SO-GS-R formulation, mice generated remarkably higher serum antibody and cytokine responses than mice immunized with FMDV antigen alone. To elucidate the mechanisms underlying the adjuvant effect of SO-GS-R, we measured cytokines in serum and muscle tissue after intramuscular injection of SO-GS-R. The results showed that injection of SO-GS-R significantly increased the levels of IL-1β, IL-5, IL-6, G-CSF, KC, MCP-1, MIP-1α, and MIP-1β in both serum and muscle. These results suggested that SO-GS-R recruits neutrophils, eosinophils, T cells and macrophages, causing immune cell recruitment at the injection site, driving antigen-presenting cells to actively participate in the onset of immunity, and amplifying the immune responses. Considering its adjuvant activity and plant-derived properties, SO-GS-R should be further studied for its adjuvant effect on vaccines used in food animals.

Three-dimensional mass transfer modeling and phenolic chemistry exploration for ultrasound-assisted and microwave drying of goji berry

Rui Zhu,Xiaoxuan Ma,Dandan Li,Yongbin Han,Sivakumar Manickam,Yang Jiao,Erico Marlon Moraes Flores,Yang Tao

Herein, goji berries were pretreated with sodium carbonate (Na 2 CO 3 ) and then dried via ultrasound-assisted air drying or microwave drying. Water migration and phenolic chemistry of the berries were studied under drying. A three-dimensional ellipsoid water transport model, accounting for porosity and temperature fluctuations, was established to explore the intricacies of the drying mechanism. Generally, microwave drying promoted interior water transport compared to ultrasound drying. Among all the drying methods, MW-240 W exhibited the highest D e (from 7.34 × 10 −9 to 9.61 × 10 −9 m 2 /s) and kc (6.78 × 10 −4 m/s) values. The goji berries received a considerably high and comparable water content gradient between its surface and center along all the drying process within the first 2 s of all the drying treatments. Microwave drying diminished the water content gradient earlier than air drying and ultrasound drying treatments. Furthermore, most correlations observed among phenolics, oxidase activity, and cell wall pectin did not align with the established theories, highlighting the highly nonlinear nature of phenolic chemistry during goji berry drying. This study provides a three-dimensional model to study the mass transfer mechanism of goji berries and analyzes the evolution of polyphenols during the drying process.

Pickering high internal phase emulsions stabilized by soy protein isolate/κ-carrageenan complex for enhanced stability, bioavailability, and absorption mechanisms of nobiletin

Hong Li,Yubo Cao,Luanfeng Wang,Fang Wang,Ling Xiong,Xinchun Shen,Haizhao Song

Nobiletin (NOB), a lipid-soluble polymethoxyflavone with potent antioxidant, antimicrobial, and anti-inflammatory properties, suffers from poor stability and pH sensitivity, limiting its bioavailability. In this study, Pickering high internal phase emulsions (HIPEs) stabilized by soy protein isolate (SPI) and κ-carrageenan (KC) were developed to encapsulate and protect NOB. The emulsions, containing a 75 % medium-chain triglyceride (MCT) volume fraction, were optimized by investigating the effects of pH and KC concentration on the key properties such as the creaming index, particle size, zeta potential, microstructure, and rheology. Results showed that under optimal conditions (pH 7 and 1.0 % KC), the SPI/KC HIPEs exhibited improved physicochemical properties. Furthermore, encapsulation of NOB in HIPEs significantly improved its stability against UV exposure, heat, and storage conditions. Additionally, simulated gastrointestinal digestion studies revealed that the SPI/KC HIPEs improved the digestion stability and bioaccessibility of NOB, with controlled release in the intestinal phase. Moreover, the SPI/KC HIPEs facilitated increased cellular uptake and bioavailability of NOB, with clathrin-mediated endocytosis and macropinocytosis as primary absorption pathways. The encapsulated NOB also showed enhanced inhibition of inflammatory markers, including NO, IL-6, and TNF-α. These findings suggested that SPI/KC HIPEs provided a promising delivery system for improving the bioavailability and bioactivity of hydrophobic compounds.