SENSORS
·
2014
·Vol. 14
·期 11
·21453-21465
·
IF 2.048
Zengyuan Pang,Jiapeng Fu,Pengfei Lv,Fenglin Huang,Qufu Wei
Camphor sulfonic acid (CSA)-doped polyamide 6/polyaniline (PA6/PANI) composite nanofibers were fabricated usingin situpolymerization of aniline under different CSA concentrations (0.02, 0.04, 0.06, 0.08 and 0.10 M) with electrospun PA6 nanofibers as templates. The structural, morphological and ammonia sensing properties of the prepared composite nanofibers were studied using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), four-point probe techniques, X-ray diffraction (XRD) and a home-made gas sensing test system. All the results indicated that the CSA concentration had a great influence on the sensing properties of CSA-doped PA6/PANI composite nanofibers. The composite nanofibers doped with 0.02 M CSA showed the best ammonia sensing properties, with a significant sensitivity toward ammonia (NH3) at room temperature, superior to that of the composite nanofibers doped with 0.04–0.10 mol/L CSA. It was found that for high concentrations of CSA, the number of PANI–H+reacted with NH3would not make up a high proportion of all PANI–H+within certain limits. As a result, within a certain range even though higher CSA-doped PA6/PANI nanofibers had better conductivity, their ammonia sensing performance would degrade.Keywords:polyaniline;camphor sulfonic acid;polyamide 6;ammonia;gas sensor
研究领域:
材料科学
·
化学工程
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Xiaoxiao Li,Xiang'an Yue,Tianqi Yue,Rongjie Yan,Oluwaseun E. Olaleye,Minglu Shao
In-depth profile control agents and surfactant have been successfully applied to control excess water production and extend the lifetime of oilfields. In this study, a novel chemical flood combination composed of controllable self-aggregating particles (CSA), and a surfactant with strong emulsifying capability was designed for heterogeneous reservoirs. A series of physical experiments were performed to investigate the injection ability, plugging performance and plugging mechanisms of CSA particles. Besides, the dominating behavior of surfactant and the effect of heterogeneity degree variation were conducted in a 2D heterogeneous model and artificial cores. More importantly, the synergistic effect of chemical flood combination and adaptability on heterogeneity were explored. The results show, the emulsifying capability of surfactant plays a key role to the oil recovery, and its enhanced oil recovery (EOR) performance is controlled by the heterogeneity degree variation. Meanwhile, CSA particles exhibit an outstanding injection ability for in-depth penetration, and a promising plugging performance with an effective flow-resistant distribution because of its physical and chemical action. Moreover, the synergism of chemical flood combination, CSA particles improving in-depth swept volume and a highly efficient surfactant, contributes to EOR potentials and adaptability on heterogeneity degree variation. Therefore, the findings of this study would provide a novel method for EOR in heterogeneous reservoirs, which can be a candidate with great potentials for field application.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2012
·Vol. 159
·期 3
·A305
·
IF 2.59
Chang Su,Guoqiang Lu,Lihuang Xu,Cheng Zhang
In this work, the spindle-shaped LiFePO4 coating with carbon layer (C-LFP) was successfully synthesized in glycerol solvent assisted by a mild heat-treatment at 600°C for 2 h. Then camphorsulfonic acid doped polyaniline (PANI-CSA) as the conductive polymer was compound with C-LFP to prepare C-LFP/PANI-CSA composite. The morphology, crystal structure and charge-discharge performance of the prepared samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and galvanostatic charge-discharge testing. The results showed that the reactant concentration seriously affected the microstructure and electrochemical properties of the resulting LiFePO4 cathodes in lithium ion batteries. And a spindle-shaped LiFePO4 with suitable size has been successfully synthesized at the moderate reactant concentration of 0.5 M. After modified with PANI-CSA, the resulted C-LFP2/PANI-CSA composite cathodes displayed a significantly improved specific capacity and rate capability. And specially, that the C-LFP/10%PANI-CSA composite exhibited the best performance with an initial discharge capacity of 165.3 mAh·g−1 at a constant current of 0.1 C. Electrochemical impedance measurements also demonstrated that the coating of polyaniline significantly decreased the charge-transfer resistance of C-LiFePO4 electrodes.
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CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Dandan Yan,Min Li,Chunxiang Qian
Phase change materials are used in cementitious materials to reduce the hydration temperature rise and thus inhibit the temperature cracks generation. However, the influence mechanism of phase change materials on the hydration properties of cementitious materials is still unclear. In this study, ZIF-8-based composite phase change materials (CPCM) were added to the Portland cement (PC) clinker-anhydrite (C$)-calcium sulfoaluminate (CSA) cement ternary system (PCCSA) in the form of admixtures. The effects of controlling the phase change temperatures, dosages of CPCM and hydration temperatures on the hydration exothermic characteristics, hydration products and the compressive strength development in the PCCSA composite system were investigated. CPCM addition reduced the hydration exothermic rate and cumulative heat release of the ternary system, especially when the phase change temperature of CPCM was 25.8 ℃, and the larger the dosage, the more obvious the reduction effect. In addition, CPCM did not participate in the hydration reaction of the system, but promoted the formation of CH and AFm. Simultaneously, the compressive strength of the PCCSA system paste containing CPCM decreased due to increased porosity in the paste. Furthermore, elevated hydration temperature significantly improved the hydration rate of the system, while reduced the hydration degree, and the hydration products types of the system were not affected by the hydration temperatures. This study results are fundamental for predicting the hydration behavior of cement systems containing CPCM and promoting the application of composite phase change materials in cementitious materials.
研究领域:
建筑材料学
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材料科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Jiarong Zhang,Wei Pei,Qilan Xu,Huijun Jiang,Jin Chen
Protein-based enzyme mimics hold advantages of easy preparation, desirable compatibility and superior catalytic performance. Taking advantage of the remarkable stability of Bactrian camel serum albumin (CSA) compared with its counterpart in human and bovine, here a novel hemin-loaded nanozyme system was prepared through the desolvation method using a recombinant CSA (rCSA). The obtained hemin-rCSA nanoparticles exhibited improved enzyme mimic activity with higher affinity to the substrates compared with bare hemin and horseradish peroxidase . Moreover, the particle size and morphology of hemin-rCSA NPs was adjustable by the optimization of ethanol addition during the desolvation process. With the efficient encapsulation of hemin in the protein nanocomposite , a colorimetric detection of glutathione with the linear calibration concentration range of 3.2–100 μM with an LOD of 0.667 μM was achieved within 8 min. The available camel-derived serum albumin of recombinant form of improved stability provides a robust and manipulable protein-based nanoplatform for the molecular design of nanozyme system with enormous biomedical potentials.
研究领域:
纳米技术
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生物化学
·
分析化学
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生物医学工程
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高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Hongyu Lu,Xinyuan Zhan,Zhengbo Yue,Zhilin Xie,Pengcheng Zhao,Wei Wang,Xiao He,Jin Wang
The large accumulation of superfine iron tailings (SIT) as solid waste may lead to significant environmental and safety risks, urgently requiring resource utilization. The preparation of geopolymers using SIT is high-valued and environmentally friendly method. Therefore, a low-cost, alkali-containing solid carbonate series accelerator (CSA) was used to accelerate the early geopolymerization process of coal fly ash (CFA)/SIT-based three-dimensional printed geopolymers (CS-3DPG). The optimal addition time and content of CSA were 25 min and 6 %, respectively, which significantly shortened the setting time of CS-3DPG to 9 min and increased its early compressive strength to 24.18 MPa. The addition of CSA enhanced the rheological properties of CS-3DPG, improving its printability and buildability. These results provide assurance for achieving rapid prototyping of CS-3DPG. Combined with microscopic characterization, selective chemical extractions (SCE) and isothermal conduction calorimetry (ICC), CSA effectively promoted the CS-3DPG geopolymerization reaction process, transitioning from interactions at the phase boundary (I) to diffusion (D). Additionally, the CO 2 emissions of CS-3DPG were reduced by 76 % compared to Ordinary Portland Cement (OPC). This study successfully reveals the role and impact mechanism of CSA in 3DPG, providing an important theoretical reference for regulating 3DPG buildability.
研究领域:
材料科学
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环境科学
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土木工程
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DOI
高影响因子
FOOD CONTROL
·
2023
·
IF 6
Shang Wang,Silin Huang,Yuying Han,Jian Wu,Tianhui Jiao,Jie Wei,Xiaomei Chen,Qingmin Chen,Quansheng Chen
Total volatile basic nitrogen (TVB-N) content is one of the critical safety evaluation indexes in seafood . This study investigated the colorimetric sensing array (CSA) technique with two data collection blocks, imaging and visible near-infrared spectroscopy, for non-destructive prediction of TVB-N content in Fujian oysters. Three data fusion strategies coupled with variable selection approaches including variable combination population analysis (VCPA), ant colony optimization, and competitive adaptive reweighted sampling were applied to establish the partial least squares (PLS) model for predicting the TVB-N content of oysters. Better prediction performance was obtained using data fusion of two information blocks than using individual block data. The results showed that the high-level-VCPA strategy showed the best performance with the correlation coefficient of the prediction set (R p ) at 0.9128. This work demonstrates that the use of CSA has the potential for non-destructive monitoring of TVB-N content in Fujian oysters.
研究领域:
食品科学
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光谱学
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传感器技术
·
水产养殖
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Shuai Yuan,Jin Yang
Protonic acid doping of heat-resistant and conductive polyurethane elastomers (PCPU) can significantly enhance their electrical conductivity. By doping with different types of protonic acids and varying molar amounts of camphorsulfonic acid (CSA), the doping mechanism and molecular structure changes of PCPU were systematically investigated using multiple characterization techniques such as Fourier-transform infrared (FTIR), X-ray diffraction (XRD), UV–vis and so on. Meanwhile, the effects of protonic acid doping on the thermal stability and mechanical properties of PCPU were further evaluated using thermo-gravimetric analysis (TGA), Differential scanning calorimetry (DSC), and stress–strain testing. Although protonic acid doping reduces the thermal stability and fracture strength of PCPU, the acid-doped PCPU can form an ionic gel network, which facilitates the uniform dispersion of electromagnetic wave (EMW) absorbers within the matrix. Additionally, protonic acid doping endows the electromagnetic wave absorbing materials (EMWAMs) prepared from PCPU and nanographite (Gr) with tunable electromagnetic matching characteristics and enhanced wave attenuation capabilities, exhibiting excellent EMW absorption performance across a broad frequency range. For instance, the 10% Gr-PCPU-2CSA composite achieves a minimum reflection loss of −27.98 dB and an effective absorption bandwidth of 5.3 GHz at a thickness of 2.5 mm. Therefore, this study provides novel insights for the development of high-performance EMW-absorbing matrix materials.
研究领域:
材料科学
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高分子化学
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电磁功能材料
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导电高分子
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微波吸收技术
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DOI
高影响因子
JOURNAL OF MAGNETIC RESONANCE
·
2023
·
IF 2.2
Wei Tao,Wancheng Yu,Xiangyu Zou,Wei Chen
A machine learning methodology using deep neural network (DNN) for interpreting multidimensional solid-state nuclear magnetic resonance (SSNMR) of various synthetic and natural polymers is presented. The separated local field (SLF) SSNMR which correlates local well-defined heteronuclear dipolar with the tensor orientation of the chemical shift anisotropy (CSA) of spin in the solid state can provide valuable structure and molecular dynamics information of synthetic and biopolymers. Compared with the traditional linear least-square fitting, the proposed DNN-based methodology can efficiently and accurately determine the tensor orientation of CSA of both 13 C and 15 N in all four samples. The method achieves prediction precisions of the Euler angles with < ±5° and is characterized by low training costs and high efficiency (<1 s). The feasibility and robustness of the DNN-based analysis methodology are confirmed by comparison to reported-literature values. This strategy is expected to aid in the interpretation of complex multidimensional NMR spectra of complicated polymer system.
研究领域:
材料科学
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化学
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高分子科学
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光谱学
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机器学习
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE BIOLOGY
·
2016
·Vol. 249
·期 6
·757-767
·
IF 1.991
Lai Lu,Li Ya-Ping,Mei Ping,Chen Wu,Jiang Feng-Lei,Liu Yi
The mitochondrial toxicity induced by GSH-CdTe Quantum dots (QDs) of different sizes was investigated. The decreases in absorbance and transmission electron microscopy images show that QDs induce the swelling of mitochondria. Results of flow cytometry indicate that QDs cause a reduction of mitochondrial membrane potential (MMP). A remarkable increase in fluidity of protein regions of mitochondrial membrane is observed, whereas the lipid regions are not obviously affected. Cyclosporin A (CsA) effectively prevents the QD-induced mitochondrial swelling. On the basis of these results, it is proposed that QDs induce mitochondrial permeability transition (MPT). Moreover, with increasing QDs size, a pronounced MPT is observed. The difference between the membrane fluidity induced by QDs and Cadmium ion and the ineffective protective effects of EDTA suggests that the mitochondrial toxicity of QDs cannot be only attributed to the release of metal ion. The protective effects of HSA indicate that the interaction of QDs with pore-forming protein gives rise to the increase in membrane fluidity. This hypothesis is demonstrated by the interaction of QDs with model membranes and proteins using differential scanning calorimetry and isothermal titration microcalorimetry. In conclusion, as the size of QDs increases, the binding affinity of QDs with membrane protein increases, and therefore causes a pronounced mitochondrial damage.
研究领域:
纳米技术
·
毒理学
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细胞生物学
·
生物物理学
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DOI
PubMed
高影响因子
EXPERIMENTAL PHYSIOLOGY
·
2021
·Vol. 106
·期 4
·958-971
·
IF 2.969
Xia Yan,Xuli Gao,Qiaohua Niu,Xin Peng,Jie Zhang,Xiufeng Ma,Yanhong Wei,Huiping Wang,Yunfang Gao,Hui Chang
New Findings What is the central question of this study? The aim was to investigate whether diaphragm hypertrophy and gastrocnemius atrophy during hibernation of Daurian ground squirrels involve differential regulation of protein metabolism and regeneration. What is the main finding and its importance? We clarified the differences in protein metabolism and muscle regenerative potential in the diaphragm and gastrocnemius of hibernating ground squirrels, reflecting the different adaptability of muscles. Are differences in the regulation of protein metabolism and regeneration involved in the different phenotypic adaptation mechanisms of muscle hypertrophy and atrophy in hibernators? Two fast-type muscles (diaphragm and gastrocnemius) in summer active and hibernating Daurian ground squirrels were selected to detect changes in cross-sectional area (CSA) and protein expression indicative of protein synthesis metabolism (protein expression of P-Akt, P-mTORC1, P-S6K1 and P-4E-BP1), protein degradation metabolism (MuRF1, atrogin-1, calpain-1, calpain-2, calpastatin, desmin, troponin T, Beclin1 and LC3-II) and muscle regeneration (MyoD, myogenin and myostatin). In the hibernation group compared with the summer active group, the CSA of the diaphragm muscle increased significantly by 26.1%, whereas the CSA of the gastrocnemius muscle decreased significantly by 20.4%. Our study also indicated that increased protein synthesis, decreased protein degradation and increased muscle regenerative potential contributed to diaphragm muscle hypertrophy, whereas decreased protein synthesis, increased protein degradation and decreased muscle regenerative potential contributed to gastrocnemius muscle atrophy. In conclusion, the differences in muscle regeneration and regulatory pattern of protein metabolism might contribute to the different adaptive changes observed in the diaphragm and gastrocnemius muscles of ground squirrels.
研究领域:
生理学
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生物化学
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分子生物学
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动物学
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DOI
PubMed
高影响因子
International Journal of Nanomedicine
·
2024
·
IF 6.6
Sammar Fathy Elhabal,Nashwa Abdelaal,Saeed AS Al-Zuhairy,Mohamed Fathi Mohamed Elrefai,Mohamed Mansour Khalifa,Mohammad Ahmad Khasawneh,Ahmed Mohsen Elsaid Hamdan,Passant M Mohie,Rania A Gad,Soad L Kabil,Mohamed Kandeel El-Ashery,Bhaskara R Jasti,Nahla A Elzohairy,Nehal Elfar,Tayseer Elnawawy,Fatma E Hassan,Mohamed Ahmed El-Nabarawi
Purpose Improving the treatment of psoriasis is a serious challenge today. Psoriasis is an immune-mediated skin condition affecting 125 million people worldwide. It is commonly treated with cyclosporine-A (CsA) and dithranol (DTH). CsA suppresses the activation of T-cells, immune cells involved in forming psoriatic lesions. Meanwhile, DTH is a potent anti-inflammatory and anti-proliferative drug that effectively reduces the severity of psoriasis symptoms such as redness, scaling, and skin thickness. CsA and DTH belong to BCS class II with limited oral bioavailability. We aim to develop a drug delivery system for topical co-delivery of CsA and DTH, exploring its therapeutic potential.Methods Firstly, we developed a niosomal drug delivery system based on ceramide IIIB to form Cerosomes. Cerosomes were prepared from a mixture of Ceramide, hyaluronic acid, and edge activator using a thin-film hydration technique. To co-deliver CsA and DTH topically for the treatment of psoriasis. These two hydrophobic drugs encapsulated into our synthesized positively charged particle cerosomes.Results Cerosomes had an average particle size of (222.36 nm± 0.36), polydispersity index of (0.415±0.04), Entrapment Efficiency of (96.91%± 0.56), and zeta potential of (29.36±0.38mV) for selected formula. In vitro, In silico, in vivo, permeation, and histopathology experiments have shown that cerosomes enhanced the skin penetration of both hydrophobic drugs by 66.7% compared to the CsA/DTH solution. Imiquimod (IMQ) induced psoriatic mice model was topically treated with our CsA/DTH cerosomes. We found that our formulation enhances the skin penetration of both drugs and reduces psoriasis area and severity index (PASI score) by 2.73 times and 42.85%, respectively, compared to the CsA/DTH solution. Moreover, it reduces the levels of proinflammatory cytokines, TNF-α, IL-10, and IL-6 compared to CsA/DTH solution administration.Conclusion The Cerosomes nano-vesicle-containing CsA/DTH represents a more promising topical treatment for psoriasis, giving new hope to individuals with psoriasis, compared to commercial and other conventional alternatives.
研究领域:
药剂学
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药物递送系统
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皮肤病学
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纳米技术
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免疫学
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药理学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）