ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Kun-Hao Liang,Zhong-Wu Lu,Cai-Xia Ren,Jie Wei,Da-Wei Fang
As an improvement on imidazolium amino acid ionic liquids, three ionic liquids, 1-ethyl-4-butyl-1,2,4-triazolium acetylglycine [Taz(2,4)][Acgly], 1-ethyl-4-butyl-1,2,4-triazolium acetylalanine [Taz(2,4)][Acala], and 1-ethyl-4-butyl-1,2,4-triazolium acetylcysteine [Taz(2,4)][Accys], were first synthesized for future application as heat-transfer media. The density, surface tension, isobaric heat capacity, and thermal conductivity were measured in different experimental temperature ranges. Based on the above experimental data, the isobaric thermal expansibility and isentropic and isothermal compressibility, as well as the isochoric heat capacity and heat-storage density, were also calculated. Compared with several popular commercial heat-transfer fluids, it was found that the ionic liquids studied in this work have better performance in terms of heat-storage density of ∼2.38 MJ·cm–3·K–1 and thermal conductivity of ∼0.197 W·m–1·K–1. In addition, the viscosity was also determined, and the results showed an unexpected reduction by the introduction of a small amount of water for ionic liquids and almost no influence on other thermophysical properties. Finally, we selected a specific heat-transfer process and calculated the heat-transfer coefficient and the heat-transfer area based on the thermophysical properties. Meanwhile, the lower liquid temperature limit (∼229 K) and the nontoxic, environmentally friendly anion could provide a wider and safer environment for the application of ionic liquids. Given this, the ionic liquids studied in this work, especially the [Taz(2,4)][Acgly], could be considered as promising heat-transfer fluid candidates by appropriate adjustment of the water content.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jihang Zhang,Jiale Chen,Yu Sha,Jiawei Deng,Jinglan Wu,Pengpeng Yang,Fengxia Zou,Hanjie Ying,Wei Zhuang
When it comes to enzyme stability and their application in organic solvents, enzyme biocatalysis has emerged as a popular substitute for conventional chemical processes. However, the demand for enzymes exhibiting improved stability remains a persistent challenge. Organic solvents can significantly impacts enzyme properties, thereby limiting their practical application. This study focuses on Lipase Thermomyces lanuginose , through molecular dynamics simulations and experiments, we quantified the effect of different solvent-lipase interfaces on the interfacial activation of lipase. Revealed molecular views of the complex solvation processes through the minimum distance distribution function. Solvent-protein interactions were used to interpret the factors influencing changes in lipase conformation and enzyme activity. We found that water content is crucial for enzyme stability, and the optimum water content for lipase activity was 35 % in the presence of benzene-water interface, which is closely related to the increase of its interfacial activation angle from 78° to 102°. Methanol induces interfacial activation in addition to significant competitive inhibition and denaturation at low water content. Our findings shed light on the importance of understanding solvent effects on enzyme function and provide practical insights for enzyme engineering and optimization in various solvent-lipase interfaces.
研究领域:
生物化学
·
酶工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Xiangli Wen,Gong Peng,Pengpeng Bai,Ningyi Yuan,Luo Yue,Yonggang Meng,Yu Tian,Lvzhou Li,Jianning Ding
With the development of deep-sea exploration technology, the technology of fire-retardant hydraulic fluid (HFC) has played an important role in the power transmission of exploration equipment. However, the mechanism of the influence of seawater content on the tribocorrosion behavior of HFC remains unclear. In this study, the effects of different seawater contents on the tribological and corrosive properties of HFC were systematically investigated. The results showed that when the seawater concentration exceeds 30 wt%, a soft Mg-containing reaction film is formed in the friction contact area owing to seawater corrosion, thus effectively improving the sintering load and wear resistance to some extent. By contrast, with increasing seawater concentration, the lubricity declines, the wear intensifies, and the extreme pressure characteristics decrease significantly. The comparative analysis shows that the composition of the wear and corrosion reaction films significantly differs under high-concentration seawater conditions, which is also a key factor affecting the friction and corrosion behavior of HFC. This study provides a direction for the research and development of wear- and corrosion-resistant materials and coatings on the surface of deep-sea exploration equipment.
研究领域:
材料科学
·
腐蚀科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 10
·1-9
·
IF 5.833
Jia Jing,Lu Wenjing,Cui Sai,Dong Chuan,Shuang Shaomin
N, Cl-doped carbon dots (N, Cl-CDs) were prepared by hydrothermal method from rhodamine B (RhB) and ethylenediamine (EDA). The resulting N, Cl-CDs exhibited fascinating solvent dependence and strict excitation independence. As the polarity of the solvent increased (from tetrahydrofuran (THF) to water), the emission spectrum of N, Cl-CDs was redshifted and the fluorescence efficiency decreased, which were attributed to hydrogen bond-induced aggregation. Taking advantage of these attributes, the N, Cl-CDs were used as suitable probes for fluorescence and colorimetric dual-mode detection of water in THF. The linear relationship was 0.5–100% water with the detection limit down to 0.093%. Moreover, the sensing platform was converted into a paper-based sensor for handy, real-time, and visible humidity sensing. N, Cl-CDs/PVA films were fabricated and realized continuously tunable solid-state fluorescence, further expanding their practical application. Graphical abstract
研究领域:
分析化学
·
材料科学
·
环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Shu Yang,Ahmed S.M. Saleh,Qiang Yang,Xiaotong Cui,Yumin Duan,Zhigang Xiao
Oleogel samples were prepared from sunflower oil with β-Sitosterol (Sit) and Stearic acid (SA) mixture. Water was added to prepare an oleogel-based emulsion. The oleogel-based emulsion showed a white and smooth appearance without separation after storage at 5 ο C for 24 h. The firmness of emulsion reduced as the water content increased, while it was increased as the oleogelator concentration increased. Additionally, diffraction patterns and thermal properties of emulsion varied depending on water content. Furthermore, all the oleogel-based emulsion samples showed a positive slope of storage modulus (G′) and loss modulus (G″) with the increase in frequency. On the other hand, the stability of β-carotene (BC) -loaded emulsion to different conditions was evaluated. A greater BC content was found for samples stored in the dark and under natural light than that of samples stored under UV light. Oleogel and oleogel-based emulsion showed a good BC release rate in simulated gastrointestinal fluids. The obtained results indicate that functional BC-fortified emulsion can be successfully prepared using β-Sitosterol and Stearic acid mixture with sunflower oil and water.
研究领域:
食品科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2023
·
IF 9
Xin Yin,Shufeng Shen
Water-lean amine absorbents have potential in reducing regeneration energy consumption for post-combustion CO 2 capture. In this work, dimethyl sulfoxide (DMSO) was proposed as a cosolvent to develop water-lean monophasic absorbents for capturing CO 2 in the simulated flue gas treatment. CO 2 absorption and desorption performance has been investigated for nonaqueous/water-lean systems involving three secondary alkanolamines and compared with the conventional monoethanolamine (MEA). Effect of water content in these absorbents on reaction products, regeneration energy consumption and capture performance was also discussed. Interestingly, the DMSO-based amine blends can maintain the monophasic state before and after CO 2 absorption at the investigated conditions. Water-lean absorbent of 2-(butylamino)ethanol (BAE)/DMSO/H 2 O was proposed for energy-efficient CO 2 capture, due to the observed high cyclic capacity and super-low energy consumption. Increasing water content in the absorbents can slightly improve the absorption capacity and cyclic capacity, but significantly increased the regeneration energy. Maintaining the water content not higher than 10 mass% can reduce the regeneration energy by 48–55% compared with the benchmark aqueous 30% MEA (4.05 MJ kg −1 CO 2 ), which makes the proposed absorbent as a compelling candidate in the conventional CO 2 capture process without major process modification.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2023
·
IF 6.1
Yanfei Jia,Bing Han,Xiao-Ting Liu,Yuhao Liu,Yuanqiang Sun,Chao Lu
Water in organic solvents is a prevalent impurity that significantly influences chemical reactions and industrial processes. Carbon dots (CDs) gained attention as promising tools for chemosensing due to their advantageous characteristics, including easy synthesis, cost-effectiveness, and excellent adjustability and stability. However, limited solubility in water and turn off fluorescence response mode hinder the practical utilization of CDs for water sensing. To tackle such dilemma, a highly water-soluble CDs with distinctive hydrogen-bond-induced emission (HBIE) was rationally designed through introducing sulfone group into the widely employed p -phenylenediamine precursor. The inclusion of sulfone group imparts the CDs with notable water solubility, as well as distinctive ratiometric fluorescent response towards water content, exhibiting high sensitivity and selectivity. Upon exposure to water, the emission color of CDs undergoes a real-time transition from blue to yellow-green, which can be readily discerned by naked eyes. The CDs have been successfully applied in detecting water in commercially available alcohol. This study presents a straightforward yet efficacious approach for rationally design of CDs with unique HBIE characteristics and ratiometric fluorescent response, offering great potential for practical chemosensing applications.
研究领域:
化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Horizons
·
2025
·
IF 10.7
Maosong Tian,Junbo Chen,Jingfu Tian,Zhihao Liang,Yuanpeng Xie
Natural wood has garnered significant interest in the field of solar steam generation (SSG), due to its merits of widespread availability, hydrophilicity, and inherent porous structure. However, the limited capillary water content and high evaporation enthalpy of wood hinder the evaporation rates of wood-based SSG. In this study, a sulfonated porous wood with high capillary water content and small evaporation enthalpy was developed for efficient solar evaporation. The relatively hydrophobic lignin and hemicellulose were initially removed to enhance capillary effects, achieving a water absorption rate of 5.2 g g−1. Subsequently, sulfonic acid groups were grafted onto the wood surface to weaken the hydrogen bond interaction between water molecules, and thereby reducing the evaporation enthalpy to 1197 J g−1. Molecular dynamics simulations indicate that the sulfonated wood surface contains abundant hydrogen bonding sites, which thermodynamically enhance the escape behavior of water molecules. As a result, the all-biomass SSG demonstrated an evaporation rate of up to 3.4 kg m−2 h−1 when combined with bamboo carbon black as a photothermal material, representing the highest evaporation rate for wood-based solar evaporation to date. This work provides an effective strategy for efficient wood-based solar steam generation.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 8
·1-9
·
IF 5.3
Guo Dongying,Yang Hailiang,Huang Yuankui,Hu Yaoping
A novel ratiometric fluorescence sensor based on a hydrophilic/hydrophobic carbon dot (CD) pair is presented for sensitive detection of water in tetrahydrofuran (THF). Hydrophilic blue-emissive CDs (B-CDs) and hydrophobic orange-emissive CDs (O-CDs) are synthesized via a one-pot hydrothermal method, exhibiting distinct structural and optical properties. While B-CDs maintain stable fluorescence in both THF and water, O-CDs undergo aggregation-induced fluorescence quenching upon incorporation of water in THF. Leveraging this contrast, the B-CDs/O-CDs dual-emission system enables ratiometric quantification of water content in a wide range of 0–70% (v/v) with a low detection limit of 0.016%. The intensity ratio ( I orange / I blue ) and emission peak shift (Δ λ orange ) provide dual-mode detection, ensuring high accuracy. Additionally, a portable polyvinyl alcohol (PVA) film embedded with the CD pair allows smartphone-assisted on-site determination of water content, achieving recoveries of 91.0–114.0% in commercial THF samples. This work offers a cost-effective and instrument-free approach for water determination, with potential applications in solvent quality control and industrial process optimization. Graphical
研究领域:
分析化学
·
材料科学
·
环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Xiaoxing Lu,Shaoxia Xie,Jian Kuang,Hujun Xie
A comprehensive experimental investigation on the microstructures of microemulsion constructed with Gemini surfactant has been carried out. The structural transition of the microemulsion system, 14-4-14/1-propanol/ n -heptane/water, from water-in-oil (W/O) to bi-continuous (B.C.) has been characterized by electrical conductivity and cyclic voltammetry . Being a typically percolative system, spherical nanodroplets are observed in the W/O system, while interlinks of water and oil continuous phases are observed in the middle phase, as confirmed by cryo-TEM. Most importantly, the role of water is clearly revealed. Increasing the water content results in size enhancement as well as improvement of micropolarity and diffusion behavior. Results of DSC measurements suggest that free water dominates only at high total water content. The unfrozen water which is not detected by DSC takes a considerable amount in the W/O system at low total water content, while the interphasal water reaches over 50% of total water in the middle phase system.
研究领域:
胶体化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Pengfei Xu,Hao Du,Xin Peng,Yu Tang,Yaoyu Zhou,Xiangyan Chen,Jia Fei,Yong Meng,Lu Yuan
Remediation of polycyclic aromatic hydrocarbons (PAHs) in oily sludge has become the focus of attention. UV spectrophotometer analysis showed that four types of PAHs were found in sample, which including phenanthrene, anthracene, benzo( a )anthracene and benzo( b )fluoranthene. In order to degrade PAH effectively, the laccase reverse micelles system was proposed. The system protects laccase from being affected by organic phase. Reverse micelles were prepared by using isooctane to simulate oil. The optimum water content W 0 was 10 by measuring the electrical conductivity of the system. Under this condition, the effects of pH, temperature and ionic strength on the degradation rate of PAHs were investigated. Also, compared with that of non-immobilized laccase, the ratio between the secondary structures of laccase under different conditions was studied. The results showed that the highest laccase activity was obtained at pH 4.2 and 30 °C with 60 mmol/L KCl. Meanwhile, the structure of α-helix accounts for the largest proportion, and the ratio of α-helix in the laccase secondary structure in the laccase-reverse micelle system was higher than that of the non-immobilized one under this condition. Finally, predicting the reactive site of the degradation of polycyclic aromatic hydrocarbons was simulated by ORCA (Version 4.2.0). The application in oily sludge was further conducted. This study provides an effective method and basis for the degradation of PAHs in oily sludge.
研究领域:
环境生物技术
·
污染生态学
·
酶工程
·
有机污染物降解
·
土壤修复
✓ 已验证
DOI
高影响因子
International Journal of Greenhouse Gas Control
·
2019
·
IF 3.231
Fangfang Li,Yinge Bai,Shaojuan Zeng,Xiaodong Liang,Hui Wang,Feng Huo,Xiangping Zhang
Protic ionic liquids (PILs) are considered as potential solvents for CO 2 capture due to their simple synthetic routes and unique properties. In this work, three low viscous PILs, tetramethylgunidinium imidazole ([TMGH][Im]), tetramethylgunidinium pyrrole ([TMGH][Pyrr]) and tetramethylgunidinium phenol ([TMGH][PhO]) were synthesized and the effect of anions, temperature, CO 2 partial pressure and water content on CO 2 absorption performance of PILs was also systematically studied. It was found that the PILs with larger basicity show higher CO 2 absorption capacity, and [TMGH][Im] simultaneously shows relatively high absorption rate and CO 2 absorption capacity of 0.154 g CO 2 /g IL at 40 °C, 1 bar. The addition of H 2 O has a positive effect on gravimetric absorption capacity of CO 2 at the range of 0–20 wt% H 2 O, and the highest capacity of 0.186 g CO 2 /g IL was achieved as the water content was 7 wt%. In situ FTIR, 13 C NMR and theoretical calculations verified that more stable bicarbonate are produced during CO 2 absorption by [TMGH][Im]-H 2 O system. However, neat [TMGH][Im] can react with CO 2 to form the reversible carbamate, leading to excellent recyclability after four absorption-desorption cycles. The results implied that neat [TMGH][Im] shows great potentials in CO 2 absorption applications.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）