JOURNAL OF MOLECULAR LIQUIDS
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2023
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IF 6
Yuzhong Shi,Jinqiu Fu,Yingying Wang,Yihang Hou,Rongxi Guo,Mengyang Cai,Yajie Zhang,Hanjie Ying,Pengpeng Yang,Keke Zhang
Nylon nF is a type of bio-based Nylon, whose raw materials NH 2 -(CH 2 ) n -NH 2 and 2,5-furandicarboxylic acid (FDCA) are both prepared by biological methods. The Nylon nF salts (PAnF salts) are the monomer salts before the polymerization of Nylon nF, whose product quality has a significant impact on the properties of Nylon nF. In this study, Nylon nF salts of FDCA and seven NH 2 -(CH 2 ) n -NH 2 diamines were synthesized. The crystal structures and thermodynamic behaviors of these Nylon salts were determined and analyzed by single crystal X-ray diffraction (SCXRD), powder X-ray diffraction (PXRD), and thermogravimetric analysis-differential scanning calorimetry (TG-DSC). Based on the analysis of melting point and solubility data, it was found that there is a significant even–odd effect between Nylon nF salts (n = 4–10). Moreover, the lattice energy and solvation energy in methanol of these Nylon salts were calculated by Materials Studio (MS) and Gaussian , respectively. The results indicated that there was also an even–odd effect in the lattice energy of Nylon nF salts. It is speculated that these even–odd phenomena were related to the symmetry of the ligand diamines and the stacking mode of Nylon salts. The study of the even–odd effect is significant in predicting and designing the physicochemical properties of cocrystals.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
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2018
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IF 5.914
Airong Xu,Lin Chen,Jianji Wang
Developing cellulose-based products is highly important because of their low-cost, reproducibility, and biodegradability. However, extensive application for cellulose has been actually hindered due to its well-known insolubility. Herein, some 22 novel functionalized imidazalium carboxylates exhibit tremendously enhanced dissolution capacity for cellulose even without extra energy consumption and are much superior to the previously reported solvents so far. Systematic investigations reveal that the powerful dissolution capacity for cellulose mainly results from the contribution of the imidazolium skeleton cation, not replacing acidic H atoms in imidazolium skeleton by alkyl, binding more allyl in N atoms of imidazolium cation, and binding an electron-donating group in carboxylate anion. Of particular importance, porous cellulose materials with varying micromorphology, for the first time, are reported by tuning the anionic and/or cationic structures of an IL. Moreover, the regenerated cellulose material retains sufficient thermostability and chemical structure. Therefore, this investigation provides a viable strategy for practical application in cellulose conversion into valuable products even without extra heating.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Junlei Wang,Hongshuai Gao,Congwen Qin,Zhimin Zhao,Hanmeng Yuan,Jia Wei,Yi Nie
Keratin, the naturally derived biomaterials have been developed and widely applied in many different fields. Among the resources containing keratin, human hair is one of the most abundant natural fibers rich in keratin and one of the most abundant waste materials produced by humans. It is critical for both value-added human hair utilization and environmental protection if suitable solvents for the dissolution and regeneration of the keratin were developed. Ionic liquids (ILs) have been evidenced to be the green solvents to extract keratin from waste human hair. In this work, five novel Protic ILs were designed and synthesized in one step with inexpensive raw materials under mild conditions. The effect of different anions and cations, temperature, and water content on the dissolution ability of Protic ILs for human hair was investigated in depth. The best IL [MEA]HCOO with high solubilization capacity (9 h, 130 °C) for human hair was finally obtained by considering the time required for complete hair dissolution and the properties of regenerated keratin. The results of FTIR, XRD, and TGA showed that the α-helix structure of regenerated keratin was not destroyed. The recycling result indicates that the dissolution ability of [MEA]HCOO for human hair kept stable after 5 times recovery. Furthermore, the density functional theory (DFT) calculations and independent gradient model (IGM) analysis uncover the dissolution of human hair by ILs through synergistic interaction between the cations and anions of ILs.
研究领域:
材料科学
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环境科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2021
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IF 5.279
Hui Gao,Jinrong Li,Feng Xu
Nitrification inhibitors (NIs) are widely applied in soil to improve the nitrogen utilization efficiency. Currently, commonly used nitrification inhibitors, like 3,4-dimethylpyrazole phosphate (DMPP), are not resistant to high temperature and do not have a phosphate-solubilizing ability. In this paper, a novel polymer nitrification inhibitor (PNI) with nitrification inhibition ability, phosphate-solubilizing ability, and good thermal stability is chemically synthesized from acrylic acid (AA) and 3,4-dimethylpyrazole (DMPZ). The PNI has a high glass transition temperature (Tg: ∼78 °C) and effective decomposition temperature (Td: ∼216 °C). The good thermal stability makes it suitable for high tower granulation processes. The PNI demonstrates an excellent nitrification inhibition performance when the dosage is 0.5 wt % of the urea fertilizer and presents good phosphate-solubilizing ability when the volume ratio of PNI to water is about 1:1000. The PNI can be applied to the field to realize nitrogen immobilization and phosphate-solubilizing at the same time or be used as the synergistic additives for fertilizers such as water-soluble fertilizers, liquid fertilizers, and compound fertilizers.
研究领域:
农业化学
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环境科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Yang Yang,Caifu Zhi,Yong Zhang,Xin Long,Jie Qi,Yang Wu,Zheng Zhang,Hongsheng Lu
Polymer emulsion drag reducers are vital components in slickwater fracturing fluids used for stimulating shale gas reservoirs. Efficient dissolution rates are crucial for maximizing the performance of friction reducers by enabling rapid friction reduction. However, the stability of W/O-type emulsion is compromised in the presence of hydrophilic surfactants, posing a significant challenge for enhancing the dissolution of friction reducers in continuous fracturing processes. Herein, a dynamic covalent trimeric stabilizer, oleylamine - glycerol triglycidyl ether (OLA-GTE), was designed to construct W/O monomer emulsions. The stabilizer underwent pH-induced cleavage of imine bonds, leading to an increased concentration and enhanced surface activity of the cationic surfactant OLA + , which facilitated the transition to reverse emulsion. The stability parameters of the monomer emulsions consisting of oil-water ratio, stabilizer concentration, and pH level were optimized by storage, centrifugation, and heat treatment. Furthermore, the polyacrylamide-based friction reducer emulsions were synthesized through inverse emulsion polymerization. The stimuli-responsive friction reducer emulsions directly dissolved in water with a pH below 5.0, which was attributed to the breakdown of OLA-GTE at the interface, coupled with the phase transition effect of the cationic surfactant OLA + . The formulation of slickwater using friction-reducer emulsions can be completed within 10 s when stimulated by water at pH 5.0, resulting in a friction-reduction rate of up to 76 %. The rapid dissolution capability is a significant advancement for applications in slickwater fracturing for shale gas reservoirs, offering quick and efficient friction reduction.
研究领域:
材料科学
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化学工程
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石油工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
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2023
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IF 3.4
Shiyuan Sun,Biyue Cui,Fanyu Kong,Zitong Zhang,Youfu Qiao,Shuting Zhang,Xinran Zhang,Changhai Sun
A quantitative structure retention relationship (QSRR) method was developed to identify flavonoid isomers auxiliary using an ultra high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) method based on the linear relationships between the Ln( k' ) values of flavonoids and their hydrogen bonding energy ( X AH ) and dissolution energy ( E S ). Chromatographic separation was achieved with a Hypersil GOLD C18 (100 mm × 2.1 mm, 1.9 µm) column and Agilent SB-C18 (2.1 ×50 mm, 1.8 µm) column on a Dionex Ultimate 3000 RSLC chromatograph . Compounds were eluted isocratically using a mobile phase containing 0.1% formic acid/water solution and methanol at a ratio of 55:45 (v/v). Mass spectrometry was performed in the negative and positive ionization modes on a Thermo Fisher Q Exactive Orbitrap mass spectrometer equipped with an electrospray ionization interface. The established QSRR model was Ln ( k ′) = 5.6163 + 0.0469 E S − 0.0984 X AH, with a determination coefficient (R 2 ) of 0.9981, adjusted determination coefficient (adjR 2 ) of 0.9976, and corrected root mean square error of 0.0682. The determination coefficient of the leave-one-out (LOO) cross-validation (Q 2 LOO ) was 0.9976, and the cross-verification root mean square error was 0.0754. Simulated samples containing 7 flavonoids were used to validate the feasibility of the method. The classical method (UHPLC-MS/MS combined the CD software and the mzCloud, mzVault and Chemspider databases) was used to identify the seven flavonoids in the simulated samples. This classic identification strategy cannot provide accurate identification results, which provided multiple identification results for each compound in the simulated samples. On the basis of the results, the 7 flavonoids were accurately identified by the established QSRR model, and the reference standards were used to validate it. The relative error of retention time(RE(t R )) between the model calculation and experimental results was less than 10%. This method effectively complements and improves the classical methods, that UHPLC-MS/MS combined the CD software and the mass spectra databases were used to identify flavonoids identification.
研究领域:
分析化学
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药物化学
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植物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
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2023
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IF 3.9
Lin Song,Han Jia,Fuling Zhang,Haidong Jia,Yuanbo Wang,Qiuyu Xie,Fangning Fan,Qiang Wang,Shijie Wen
Surfactant-free microemulsions (SFMEs) have been explored extensively to avoid the residual surfactant problem caused by traditional surfactant microemulsions. Many researchers focused on the SFMEs with tertiary amine, which exhibited the typical CO2 response behavior. In this study, the phase diagram of the SFMEs consisting of tripropylamine (TPA), ethanol, and water was readily prepared via the measurements of electrical conductivity. The CO2 response behavior of SFME was confirmed by determination of conductivity and measurement of the average diameter of SFME, which was mainly dependent on the protonation of TPA induced by the additional CO2. The transition of protonated TPA to a more hydrophilic nature from lipophilicity to hydrophilicity should be responsible for the variation of SFME average diameter. In addition, the SFMEs exhibited remarkable solubilizing capacity of crude oil, and three types of SFMEs achieved more than 80% oil removal rate in the washing process of oil sands. It was noted that both oil-in-water and bicontinuous SFMEs could be circularly utilized at least three times with a relatively high oil removal rate (%). Our work provided the insight perspective on the mechanism of SFMEs with a CO2 response behavior.
研究领域:
化学工程
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环境科学
✓ 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）