CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Zhen Song,Dian Yu,Qian Zeng,Jingjing Zhang,Hongye Cheng,Lifang Chen,Zhiwen Qi
When evaluating ionic liquids (ILs) for extractive desulfurization (EDS) of fuel oils, the inevitable presence of water in the system may have a significant and in many cases strongly negative effect. However, few studies have considered this particular issue and a promoted water effect on EDS is scarcely reported. In this work, COSMO-RS was firstly employed to calculate the capacity and selectivity for EDS of various IL/H 2 O mixtures, which cover different IL characters and a wide water concentration range. Experiments were then conducted with a representative IL [C 4 MIM][H 2 PO 4 ], whose stable and even promoted extraction performance with a small amount of water was suggested by COSMO-RS. Through analyses of the desulfurization ratio, the cross-solubility and the water content in the desulfurized fuel, the promoted effect of water within a certain range (< 10 wt%) was experimentally demonstrated. Moreover, such effect of water was explained combining the viscosity, the solvent–solute interactions and the COSMO-RS based analysis.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Algal Research-Biomass Biofuels and Bioproducts
·
2021
·
IF 4.401
Xinshu Li,Xin Sun,Lin Gao,Juntian Xu,Guang Gao
Pyropia is an important marine crop and periodical dehydration could help kill fouling organisms during cultivation. However, our understanding regarding the effects of periodical dehydration on biomass yield and biochemical composition of Pyropia remains very lacking, particularly for thalli grown at different salinities. In this study, Pyropia yezoensis experiencing periodical dehydration or not was cultured at four levels of salinities (17, 25, 32, 39 psu) for 19 days. The highest growth rate was found at salinity 25 psu and lowest was at salinity 39 psu. Dehydration reduced relative growth rate at each salinity except for the insignificant decrease at 39 psu. Dehydration did not affect the maximal photochemical efficiency (Fv/Fm) and the highest salinity decreased it slightly. Dehydration induced more Chl a and carotenoids and highest Chl a content was found at salinity 39 psu. Dehydration did not affect phycoerythrin or phycocyanin content at salinities 25–39 psu but respectively increased them by 28% and 50% at salinity 17 psu. Dehydration did not affect content of any amino acid while salinity interacted with dehydration on most amino acids. The optimal salinity for the production of total amino acids (AA)，essential AA, umami AA, and sweet AA was 25 psu for the thalli without dehydration; while it shifted to 17 psu for the thalli with dehydration. Dehydration and salinity interacted on content of the fatty acids C12, C18:1(n-9), C18:2(n-6), and C20:2(n-6). For the synthesis of eicosapentaenoic acid (EPA, C20:5(n-3)) and polyunsaturated fatty acids (PUFA) in thalli without dehydration, the optimal salinity was 39 psu, but the effect of salinity disappeared when thalli experienced periodical dehydration. These findings show the interactive effects of periodical dehydration and salinity on biomass yield and biochemical composition in P. yezoensis and provide insights into optimizing conditions for nori cultivation.
研究领域:
海洋生物学
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藻类学
✓ 已验证
DOI
高影响因子
Journal of the American Chemical Society
·
2021
·
IF 15.419
Zhuang Hu,Yufei Shu,Haiyan Qin,Xiaofei Hu,Xiaogang Peng
With high-quality CdSe/CdS core/shell nanocrystals as the main model system and under a controlled atmosphere, responses of photoexcited semiconductor nanocrystals to two active species (water and/or oxygen) in an ambient environment are studied systematically. Under photoexcitation, although high-quality semiconductor nanocrystals in either thin solid films or various solutions have a near-unity photoluminescence quantum yield, there is still a small probability (∼10–5 per photon absorbed) to be photoreduced by the water molecules efficiently accumulated in the highly hydrophilic nanocrystal–ligands interface. The resulting negatively charged nanocrystals are the starting point of most photophysical variations, and the hydroxyl radical─key photo-oxidation product of water─plays the main role for initiating various photochemical processes. Depending on the supplementation of water to the interface, accessibility to oxygen, photoirradiation power, type of matrices, type of measurement schemes, and solubility of nanocrystals in the solution, various photophysical/photochemical phenomena─either reported or not reported in the literature─are reproducibly observed. Results confirm that photophysical properties and photochemical reactions can be well-correlated, offering a unified and unique basis for fundamental studies and the design of processing techniques in industry.
研究领域:
材料科学
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光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Tian Lan,Jimin Xu,Chengjie Wang,Yiran Wang,Xiangyang Liu,Maogang He
The advantages of deep eutectic solvent (DES), such as non-toxic, non-flammable, low vapor pressure and low cost, make it a green solvent for capturing carbon dioxide. Adding water can change the nanostructures of DES and thus significantly influent the physical and chemical properties. At present, most researches focus on the theoretical study while few experimental studies on the effect of water on the thermal conductivity of DES. In this paper, the 3ω experimental system was improved using a two-wire structure to eliminate the end effect and measured the thermal conductivities of the DES composed of choline chloride and ethylene glycol and its aqueous solution to study the effect of water on the thermal conductivities. The uncertainty of thermal conductivity is less than 4%. The second-order Scheffé polynomial was modified to make it more suitable for fitting the thermal conductivities of the mixtures containing DES. The average absolute relative deviation calculated by the equation is 2.16%, which corroborates the high accuracy of the improved equation.
研究领域:
物理化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 101
·期 9
·4038-4043
·
IF 2.956
Wen Bin Hong,Lei Li,Meng Cao,Xiang Ming Chen
NaCl ceramics were prepared by room-temperature cold sintering using moistened NaCl powder with 4 wt% water and dry pressing using dehydrated powder. When the applied uniaxial pressure is low, the relative density of dry-pressed NaCl ceramic is significantly lower than that of cold-sintered ceramic, while the former is 98.5%-99.3% and much higher than the latter (94.3%-94.6%) for high applied pressure of 200-300 MPa. The uniaxial pressure-induced plastic deformation dominates the densification of dry-pressed NaCl ceramic, and also plays a role during cold sintering as well as the dissolution-precipitation process. The lower density of cold-sintered NaCl ceramic under high applied pressure is attributed to the trapped water in ceramic body during cold sintering. Besides, the presence of water always promotes the microstructural homogeneity, which is responsible for the much higher Qf value of cold-sintered NaCl ceramic. The optimal microwave dielectric properties with ε r = 5.55, Qf = 49 600 GHz, and τ f = −173 ppm/°C are obtained in cold-sintered NaCl ceramic under the applied pressure of 300 MPa, indicating that it is a promising candidate as a microwave dielectric material.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2021
·
IF 5.909
Mingcheng Li,Chunying Zhu,Taotao Fu,Xiqun Gao,Youguang Ma
Water, can not only regulate the thermodynamic properties of deep eutectic solvent (DES), but also affect its supramolecular structure. Therefore, it is necessary and meaningful to study the effect of water on DES. In this work, amine functionalized DES (choline chloride + monoethanolamine) was successfully prepared, and the densities and viscosities of DES + H 2 O were measured from 293.15 K to 323.15 K. The effects of DES composition, water content and temperature on the excess molar volume, partial molar volume, apparent molar volume, limiting molar volume, coefficient of thermal expansion, viscosity deviation and activation energy for viscous flow were investigated. The hydration and structural changes of DES were analyzed. Additionally, the Redlich-Kister equation was used to correlate the excess properties of DES + H 2 O. Finally, a three-stage theory of effect of water on DES, namely the pure DES stage, the destruction stage and the thorough destruction stage, was proposed. Conclusively, it can be seen that an appropriate amount of water is very helpful to improve the properties of DES, otherwise the structural advantages of DES will be lost. It is hoped that this study will lay a foundation for the application of DES.
研究领域:
化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Meng Kou,Feng Qin,Xiyu Zhang,Yongda Wang,Hua Zhao,Zhiguo Zhang
Porphyrin derivatives, which played a key role in photodynamic therapy (PDT), exhibit different photophysical and photochemical properties in aqueous solution of organism and organic solvents . Limited by the poor water-soluble, present studies on porphyrin derivatives covered the real performance in aqueous solution of organism. In this study, the water effect on the properties of porphyrin derivatives was investigated by the water proportion evolution spectroscopy. The variation in fluorescence intensities of hematoporphyrin monomethyl ether (HMME) in solvents with different proportions of methanol and water were analyzed. Corresponding absorption spectra were measured, and the absorption intensity at the excitation wavelength is found to be unchanged. Utilizing Perrin-Jablonski energy level structure, as well as related rate equations , the fluorescence variation is supposed to be origin from both the decreased intersystem crossing rate ( k ISC ) and increased non-fluorescence transition rate ( k nF ). The decrease of k ISC is induced by the raise of the lowest vibrational energy level of the first singlet excited state (S 1 ), which can be verified by the blue-shift of the absorption and fluorescence spectra . The increase of the k nF was caused by the high-energy vibrations in aqueous solutions. The fluorescence lifetimes are also measured, which consist with our analysis. Our research not only uncovered the water effect on the properties of HMME, but also provided a way to insight the PDT behavior of porphyrin derivatives in the aqueous solution of organism.
研究领域:
生物化学
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医学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 4
·1834-1839
·
IF 3.269
Ying Zhang,Zijian Gao,Zhe Yu,Xiuyan Ren,Lijie Duan,Guang Hui Gao
In this manuscript, hydrogels with pH-tunable mechanical properties were prepared via transforming the non C–C covalent synergistic interactions of hydrogen bonding, metal ion coordination and hydrophobic effects. The fracture stress of hydrogels exhibited a tendency to firstly decrease and then increase with an increase of pH from 3.0 to 9.0. That is, the fracture stress was enhanced due to the synergistic interactions of hydrophobic effects and hydrogen bonding among carboxylic acid groups at pH 3.0. Then, the strength gradually decreased due to the disappearance of hydrogen bonding at pH from 3.0 to 5.0. Moreover, the fracture stress was also significantly enhanced at pH over 5.0 due to the synergistic interactions of hydrophobic effects and metal ion coordination. Consequently, it is envisioned that the strategy to design novel hydrogels with pH-tunable mechanical properties would provide more interesting directions for hydrogels based on non C–C covalent synergistic interactions in potential biomedical applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 7
·4631-4640
·
IF 3.5
Xu Wang,Hexin Zhang,Xiao Yu,Xiumei Mo,Jie Gao,Yunfeng Hu,Jie Min,Qi Ding,Yuchi Fan,Wan Jiang
The dicalcium phosphate anhydrous (DCPA, CaHPO 4 ) bioceramic has long been difficult to prepare by conventional sintering techniques due to its weak thermal stability. Here, the DCPA ceramic is prepared at 250°C by cold sintering process (CSP) using the dicalcium phosphate dihydrate (DCPD, CaHPO 4 ·2H 2 O) as the starting powder. It is found that the dehydration temperature of DCPD powder is greatly reduced during CSP, which facilitates the densification even without additive water. However, the ceramic only reaches a relatively low density of around 90% without additive water, which can be ascribed to the lack of particle rearrangement and the readily loss of dehydration water during sintering. In comparison, a high relative density of 95% can be obtained when the DCPD hydrate is densified with additive water, in which both hydration water and additive water play important roles. The obtained DCPA ceramic with high density exhibits a flexural strength of 46.17 MPa and Young's modulus closer to human bones compared with hydroxyapatite. Combined with the low cytotoxicity, the DCPA bioceramic has great potential to be applied for bone tissue engineering.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Yu Lin,Kai Wu,Xin Zhou,Yunsheng Xia
For nanocrystals (NCs) self-assembly, understanding the chemical and supramolecular interactions among building blocks is significant for both fundamental scientific interests and rational nanosuperstructure construction. However, it has remained an extreme challenge for many self-assembly systems due to the lack of appropriately quantitative approaches for the corresponding exploration. Herein, by combination of the proposed colorimetric method for cationic surfactant quantitation and all-atom simulations, we manage to present a clear chemical picture for the thiol molecules modulated self-assembly of gold nanorods (GNRs), one of the earliest and most convenient methods for the fabrication of freestanding GNR self-assemblies. It is revealed that the self-assembly of GNRs is driven by the hydrophobic effects of the alkyl chains of the modified cationic surfactants, as their bilayer structure is destroyed by the added thiol molecules. In other words, the actual roles of the thiol molecules for causing GNRs assembly are indirectly inductive effects instead of the previously believed direct electrostatic attraction and/or hydrogen-bond linking effects of the binding thiol molecules. Furthermore, the GNRs exhibit diameter-dependent assembly behaviors: thicker GNRs tend to adopt the end-to-end assembly mode, while thin ones prefer the side-by-side assembly mode, further demonstrating that hydrophobic effects among the build blocks are the driving force for the GNRs assembly.
研究领域:
纳米材料科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Bo Yang,Panpan Ren,Lu Xing,Shenghan Wang,Chenglin Sun
Insights into the solute-induced water structural transformations are essential to understand the role of water in biological and chemical reaction processes. Herein, the structural changes in water induced by amphiphilic organic molecules were investigated using concentration-dependent derivative Raman spectroscopy (DRS) combined with two-dimensional Raman correlation spectroscopy (2D Raman-COS). We shall restrict our attention in this work to binary mixtures of water with dimethyl sulfoxide (DMSO), acetone, and isopropanol (IPA), all of which have similar chemical structures. The spectral changes in O:H and O H stretching modes illustrate that the solute molecules induce an enhancement of the water structure in dilute solutions, where the enhanced degree of water structure is closely related to the size of the dipole moment of organic molecules. In addition, the transformations of solute-induced water-specific structures were evaluated by 2D Raman-COS, which shows that the strong hydrogen bond (H-bond) structure of water is more sensitive to organic molecules and induces a transition to the weak H-bond structure of water.
研究领域:
生物物理学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Haichang Ding,Baoqiang Li,Zonglin Liu,Gang Liu,Shouzhi Pu,Yujie Feng,Dechang Jia,Yu Zhou
Injectable chitosan hydrogels exhibit excellent biological properties for application in biomedical engineering, however most of these hydrogels have limited applicability because “Swelling” can induce volume expansion of conventional hydrogels implanted in the body damages the surrounding tissues. Here, we report a new “Nonswelling” pentenyl chitosan (PTL-CS) hydrogel via N‒acylation reaction to graft an UV crosslinkable short hydrophobic alkyl chain ( n ‒pentenyl groups). The incorporated pentenyl groups can be crosslinked by UV irradiation to form hydrophobic chains via combination termination, which generate strong hydrophobic effect to extrude the excess water in hydrogel, resulting in a “Nonswelling” state at biological temperature. Furthermore, the PTL-CS solution showed no cytotoxicity in vitro and minimally invasive treatment in vivo demonstrated the PTL-CS hydrogel no adverse effects in a rat model. The nonswelling injectable and UV crosslinkable chitosan hydrogel hold potential applications in smart biomaterials and biological engineering as well as providing a new natural hydrogel in minimally invasive tissue engineering..
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）