JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Xianze Meng,Xinran Li,Qinhao Zhang,Liankui Wu,Fahe Cao
In the laboratory, the 3.5 wt.% NaCl aqueous solution is commonly used to simulate the seawater environment. The thermodynamic and kinetic research on the aqueous solution structure is intriguing, and it would aid in explaining the initial mechanism of the seawater-related physical and chemical phenomena. In this paper, the solution structure and evolution of the hydrogen bond network at the temperature range of the marine environment were obtained using classical molecular simulation and in-situ Raman spectroscopy. Specifically, the tetrahedral hydrogen bond structure was decomposed into two types: DDAA a affected by ions and DDAA n unaffected by ions. Furthermore, the enthalpy and entropy change of hydrogen bond evolution in the temperature range were calculated to be 14.05 ± 0.75 J·mol −1 and 53.38 ± 2.49 J·mol −1 ·K −1 . This work lays the groundwork for preliminary mechanism research of life phenomena, physical properties, and chemical reactions in the marine environment.
研究领域:
物理化学
·
海洋科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Lingzong Meng,Xia Wang,Dan Li,Tianlong Deng,Yafei Guo,Lan Yang
The solubilities in the quaternary system NaCl–KCl–SrCl2–H2O and its subsystem KCl–SrCl2–H2O at 288.15 K were investigated with the isothermal dissolution method. The phase diagram of the ternary system is composed of two single-salt crystallizations for KCl and SrCl2·6H2O, two solubility univariant curves, and one cosaturated point. The dry-salt diagram of the quaternary system consists of three single-salt crystallization fields for NaCl, KCl, and SrCl2·6H2O, three solubility univariant curves, and one invariant point. By combination of the determined solubilities and Pitzer binary parameters obtained in the literature, the lacking Pitzer mixing parameters θNa,Sr, θK,Sr, ΨNa,Sr,Cl, and ΨK,Sr,Cl and the solubility product constants of the solid salts for the systems were fitted on the basis of the Pitzer model. The model was then used to calculate the solubilties of the two systems. The theoretical results calculated using the model coincide with the experimental values.
研究领域:
化学热力学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Shibo Han,Guangying Huang,Han Han,Xilai Yan,Jie Xie,Hongshen He,Ajoy Kanti Mondal,Weijie Lin,Fang Huang
Currently, most polyols used in polyurethane foam (PUF) synthesis are derived from petrochemicals. However, lignin as the most abundant aromatic biopolymer rich in hydroxyl groups, is a suitable filler for synthesizing polyurethane foam. Therefore, in this study, Kraft lignin (KL) was utilized as a partial substitute for flexible polyethylene glycol 400 (PEG400). After adding 15 % KL, NaCl was introduced as a medium for synthesizing LFPUF and Polydimethylsiloxane (PDMS) was used as a foam stabilizer. Lignin-based flexible polyurethane foam (LFPUF) with high elasticity was synthesized. The aromatic ring structure of KL acted as a reinforcement for the foam, while the flexible PEG400 provided excellent flexibility to LFPUF. Na + interacts with oxygen atoms in the long chain of PEG to form a cyclic crown ether structure. This promotes proximity and ordering of the hydroxyl groups, thereby facilitating proton transfer and optimising the cell size of the foam. Ultimately, the foam synthesized with 3 % NaCl (LFPUF-3%NaCl) exhibited an average cell size and hole size of 484.1 and 183.6 μm, respectively, significantly smaller than those of the foam synthesized without NaCl (843.5 and 249.3 μm, respectively). The foam resilience and elastic recovery of LFPUF-3%NaCl were 39.56 and 99.03 %, respectively, which was higher than that of the foam synthesized without NaCl (20.36 % and 97.08 %, respectively). In addition, LFPUF-3%NaCl maintained a high elastic recovery of 97.61 % after 20 cycles of compression. The egg drop test demonstrated that the foam effectively provided protective cushioning for fragile items.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2017
·Vol. 48
·期 5
·2535-2542
·
IF 1.642
Zhang Zhong-Lin,Zhou Lin-Zong,Ji De-Bin,Yan Yong-De,Hong Wei,Liu Yu-Hui,Wang Pu,Yin Tai-Qi,Zheng Jia-Ning,Xue Yun,Ye Yuan-Feng
Electrochemical behavior of Nd was studied in NaCl-KCl melt on W and Cu electrodes via cyclic voltammetry and chronopotentiometry. Generally, the reduction of Nd 3+ takes place in two consecutive steps in molten chlorides, such as LiCl-CaCl 2 , LiCl-BaCl 2 , CaCl 2 -NaCl, LiCl-KCl melts. However, the reduction of Nd 3+ ions was found to be through a one-step process: Nd 3+ + 3e − → Nd. The co-reduction behavior of Nd 3+ and Cu 2+ ions and the mechanisms of alloy formation were investigated in NaCl-KCl melt on W electrodes at 988 K (715 °C). Four potential plateaus corresponding to four different kinds of Cu-Nd intermetallic compounds were detected. Cu-Nd alloys were prepared on Cu electrodes at 988 K (715 °C) and 1143 K (870 °C). At 988 K (715 °C), Cu 5 Nd phase was identified by X-ray diffraction. The morphology and micro-zone chemical analysis of the alloys were characterized by scanning electron microscopy equipped with energy-dispersive spectrometry. The alloy film was observed on the Cu electrodes. Moreover, at 1143 K (870 °C), a globate bulk Cu-Nd alloy with Cu 5 Nd, Cu 4 Nd, Cu 2 Nd, CuNd, and Cu phases, as liquid in the melt, was obtained at the bottom of the crucible.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Marine Science and Engineering
·
2022
·Vol. 10
·期 4
·548
·
IF 2.744
Haopeng Zeng,Yu Zhang,Lei Zhang,Zhaoyang Chen,Xiaosen Li
Most resources of natural gas hydrate (NGH) exist in marine sediments where salts and sea mud are involved. It is of great importance to investigate the effects of salts and sea mud on NGH formation kinetics. In this study, the mixture of silica sand and montmorillonite was used to mimic sea mud. The effects of the NaCl concentration of pore water and montmorillonite content on methane hydrate formation were studied. A low NaCl concentration of 0.2 mol/L and a low montmorillonite content range of 10–25 wt% is beneficial to reduce the induction time of hydrate formation. The high NaCl concentration and high content of montmorillonite will significantly increase the induction time. The average induction time for the experiments with the NaCl concentrations of 0, 0.2, 0.6, and 1.2 mol/L is 20.99, 8.11, 15.74, and 30.88 h, respectively. In the pure silica sand, the NaCl concentration of 0.2 mol/L can improve the final water conversion. In the experiments with pure water, the water conversion increases with the increase of the montmorillonite content due to the improvement of the dispersion of montmorillonite to water. The water conversion of the experiments in pure water with the montmorillonite contents of 0, 10, 25 and 40 wt% is 12.14% (±1.06%), 24.68% (±1.49%), 29.59% (±2.30%), and 32.57% (±1.64%), respectively. In the case of both montmorillonite and NaCl existing, there is a complicated change in the water conversion. In general, the increase of the NaCl concentration enhances the inhibition of hydrate formation and reduces the final water conversion, which is the key factor affecting the final water conversion. The average water conversion of the experiments under the NaCl concentrations of 0, 0.2, 0.6 and 1.2 mol/L is 24.74, 15.14, 8.85, and 5.74%, respectively.Keywords:methane hydrate;NaCl concentration;montmorillonite;hydrate formation kinetic
研究领域:
化学工程
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地质学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Ke Wang,Wei Li,Zeguang Yin,Zhongyun Zhou,Pengfei Zhao
A sodium chloride (NaCl) doping–hydration technique was used to modify the structure of Li4SiO4 to improve its sorption properties at a low CO2 concentration. X-ray diffraction, nitrogen adsorption, scanning electron microscopy, X-ray photoelectron spectroscopy, differential scanning calorimetry, and thermogravimetric analyses were conducted to characterize the compositions, textural characteristics, morphologies, chemical valence states, molten phases, and adsorption properties of the synthesized samples. Hydration and NaCl doping produced synergistic effects. On one hand, a small particle size and large specific surface area were obtained, significantly facilitating chemisorption processes. On the other hand, co-doped sodium and chlorine induced molten phases when absorbing CO2, noticeably decreasing CO2 diffusion resistance. Thus, the CO2 absorption rate and uptake were remarkably improved. Different amounts of NaCl also greatly affected the morphology and chemisorption properties of the sorbents. At the optimized NaCl concentration, the sorbent only required 3 wt % doping to attain a maximum sorption capacity of up to 34.2 wt %. Moreover, the high capacity was maintained after 10 sorption/desorption cycles.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Hongmei Zhong,Ting Meng,Wenxiang Ding,Yi Xiao,Peng Zhang
Passive radiative cooling technology serves as an energy-free alternative to traditional cooling systems. Porous polymer structures are frequently employed for radiative cooling by leveraging the refractive index mismatch between the polymer and the pores, enabling the scattering of incoming sunlight. Recently, water-soluble and readily available Sodium chloride (NaCl) particles have been utilized as sacrificial templates for sustainable pore creation. Nevertheless, optimizing NaCl particle size, and thus the polymer pore size to enhance scattering capabilities remains a challenge. Here, we report a simple, scalable, and sustainable approach to creating an optimized porous polydimethylsiloxane (PDMS) film. This approach utilizes ultrafine NaCl powders as sacrificial templates, which were synthesized via ultrasonic precipitation to ensure their small size. The ultrafine NaCl particles have a size distribution centered around 6–8 μm, and the as-fabricated porous PDMS film achieves a high thermal emissivity of 0.95 within the atmospheric window (8–13 μm) and exhibits a reflectivity of 0.95 within the visible range (0.4–0.78 μm). Due to the desired dual-spectrum properties, the porous PDMS film exhibits a superior subambient cooling capacity over that fabricated with typically larger NaCl particles under strong sunlight. This study offers a scalable and practical radiative cooling solution for sustainable thermal management.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 15
·8313-8323
·
IF 3.917
Wang Chao,Yang Guihua,Zhang Xueming,Shao Lupeng,Lyu Gaojin,Mao Jianzhen,Liu Shijie,Xu Feng
Levulinic acid (LA) production from corncob acid hydrolysis residues (CAHR) using FeCl 3 as Lewis acid catalyst in green solutions of salt was investigated. The reaction kinetic relationships were determined in the temperature range of 160–180 °C, with FeCl 3 concentrations of 0.12–0.36 M, and a reaction time of 0–60 min. The maximum LA concentration of 59.0 mol% (24.5 g/L) was achieved at 170 °C in a 30% NaCl solution containing 0.24 M FeCl 3 . A pseudo first-order kinetic model was proposed to describe the cellulose deconstruction to LA. The model agreed perfectly with the evolution in the concentrations of the major compounds such as glucose, 5-hydroxymethylfurfural and LA during the CAHR hydrolysis. The kinetic model developed for CAHR was in good agreement with that previously developed for other lignocellulosic systems. Based on our kinetic model and reaction system, the LA yield is increased at the lower end of the temperature range with the higher acid concentrations. The results indicated that the concentrated seawater after desalination could be a green solvent in the biorefinery.
研究领域:
化学工程
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生物技术
·
可再生能源
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Lan Yang,Dan Li,Tao Zhang,Lingzong Meng,Tianlong Deng,Yafei Guo
Solubilities and refractive indices in the ternary system NaCl–NaBO 2 –H 2 O at 323.15 K were investigated with the dissolution equilibrium method. The phase diagram of this system consists of three single-salt crystallization regions for NaBO 2 ·4H 2 O, NaCl·NaBO 2 ·2H 2 O and NaCl, three univariant solubility curves and two invariant points. A comparison of the diagrams of this system from 288.15 to 323.15 K shows that area of NaBO 2 ·4H 2 O region decreased whereas the areas of NaCl·NaBO 2 ·2H 2 O increased obviously with temperature increasing. The Pitzer binary parameters of NaB(OH) 4 , Pitzer mixing parameters θ Cl - , B OH 4 - and ψ Na + , Cl - , B OH 4 - , and the dissolution equilibrium constants of NaB(OH) 4 ·2H 2 O and NaCl·NaB(OH) 4 were fitted with the solubility data on the basis of Pitzer model. The variation trends for calculated solubility curves are in accordance with the experimental results. The results show that the other boron species except B(OH) 4 − in the solution for the system NaCl–NaB(OH) 4 –H 2 O can’t be neglected. The assumption of only one boron containing ionic species B(OH) 4 − in the solution is not very accurate, but the calculated results with the assumption can still describe the experimental values. The Pitzer parameters and K sp values obtained in this study are capable of solubility calculation for the system containing B(OH) 4 − .
研究领域:
物理化学
·
无机化学
✓ 已验证
DOI
高影响因子
Frontiers in Plant Science
·
2017
·
IF 4.291
Ni Jun,Hao Juan,Jiang Zhifang,Zhan Xiaori,Dong Lixiang,Yang Xiuli,Sun Zhehang,Xu Wenya,Wang Zhikun,Xu Maojun
The flavonoids in the extracts of Ginkgo leaves have been shown to have great medical value: thus, a method to increase the flavonoid contents in these extracts is of significant importance for human health. In the present study, we investigated the changes in flavonoid contents and the corresponding gene expression levels in post-harvest Ginkgo leaves after various treatments. We found that both ultraviolet-B and NaCl treatment induced flavonoid accumulation. However, gene expression analysis showed that the increases in flavonoid contents were achieved by different pathways. Furthermore, post-harvest Ginkgo leaves responded differently to NaCl treatment compared with naturally grown leaves in both flavonoid contents and corresponding gene expression. In addition, combined treatment with ultraviolet-B and NaCl did not further increase the flavonoid contents compared with ultraviolet-B or NaCl treatment alone. Our results indicate the existence of a novel mechanism in response to NaCl treatment in post-harvest Ginkgo leaves, and provide a technique to increase flavonoid content in the pharmaceutical industry.
研究领域:
植物学
·
药理学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Yaowen Jiang,Zaihua Duan,Zongxiao Fan,Peng Yao,Zhen Yuan,Yadong Jiang,Yu Cao,Huiling Tai
The power generation humidity sensor has received great attention, however, how to improve its humidity sensing performance (e.g., detection range and response speed) is still facing many challenges. Herein, we propose a simple power generation humidity sensor using NaCl as electrolyte and halloysite nanotubes (HNT) as humidity sensing material . The results show that the introduction of HNT can significantly improve the humidity sensing performance of the humidity sensor based on bare NaCl electrolyte. Specifically, the NaCl/HNT humidity sensor has a wide detection range (10.9 −91.5% relative humidity (RH)), short response time (11.3 s), and good repeatability (20 cycles). The output voltage of the NaCl/HNT humidity sensor reaches 0.537 V at 91.5% RH, and the corresponding maximum power is 1.56 μW. In addition, the NaCl/HNT humidity sensors with series integration can charge the capacitor at high humidity, and the NaCl/HNT humidity sensor can be used for monitoring respiratory patterns. This work provides a useful strategy for fabricating high-performance power generation humidity sensor.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Haijun Han,Dongdong Li,Lijiang Guo,Yan Yao,Haitang Yang,Dewen Zeng
Water activity for binary KCl–H2O, NaCl–H2O and MgCl2–H2O, as well as two ternary NaCl–MgCl2–H2O and KCl–MgCl2–H2O, systems has been measured by using an isopiestic method at 323.15 K. The isopiestic results obtained show that the isopiestic composition lines of the NaCl–MgCl2–H2O system was found to obey the Zdanovskii rule, whereas the KCl–MgCl2–H2O system was observed to deviate slightly. The experimental water activities determined were applied to regress the parameters of the Pitzer model with a good agreement. The model with new parameters is validated by comparing water activity predictions with those given in the literature and not used in the parametrization process and calculating the solubility of the NaCl–MgCl2–H2O and KCl–MgCl2–H2O systems at various temperatures with the comparison of literature values.
研究领域:
化学
·
热力学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）