TALANTA
·
2017
·
IF 4.162
Qian Liu,Chaoping Xu,Heng Liang
We developed novel laser carved micro-crack (LCC) paper-based channels to significantly accelerate the liquid flow without an external pump. For the aqueous solutions they increased the flow velocity 59 times in 16% laser power-8 micro-cracks-LCC channel compared with it in solely-printed channels. All experimental data from both LCC and solely-printed channels were well-fitted by the time-distance quadratic trinomial that we developed on laser power and micro-crack number. We designed and fabricated T-junction microstructures of LCCs. Further, the microfluidic paper-based analytical device (μPAD) of LCC on dye mixing gradient and pH gradient were developed with the characteristics, fast self-acting transportation and high-performance mixing of liquid flows. In the dye mixing gradient the time cost was reduced from 2355 s in the solely-printed one to only 123 s in the five-stage of this LCC-μPAD. It was useful for quick and long-distance transferences through the multiple units of μPADs. Certainly, this LCC-μPAD was inexpensive, disposable, portable and applicable to resource-limited environments.
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JOURNAL OF MOLECULAR LIQUIDS
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2016
·
IF 2.74
Qian Tan,Yixin Leng,Jun Wang,Chunxiang Huang,Ye Yuan
The solubility data on solid–liquid equilibria (SLE) of racemic tartaric acid in ethanol + water mixtures were measured in the temperature range of (293.15 to 318.15) K at 0.1 MPa by acid–base titration method. In the binary solvent mixtures the solubility of racemic tartaric acid increases with rising temperature and decreases with increasing ethanol content. The modified Apelblat equation, λ h equation and CNIBS/R–K equations were applied to describe and predict the change tendency of solubility. Computational results show that the modified Apelblat equation is superior to the others. Furthermore, a predictive version of the NRTL model was proposed for the description of the non-ideality of the racemic tartaric acid–ethanol–water system. The predicted values were compared with the experimental data. The agreements are good. By using the van't Hoff equation the molar enthalpy, entropy and Gibbs free energy changes of solution were calculated. A linear ∆ sol H versus ∆ sol S compensation plot with a positive slope was obtained by means of enthalpy–entropy compensation effect.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2017
·Vol. 96
·期 3
·739-748
·
IF 1.356
Chun Xi Qin,Cheng Lin,Jie Tang,Zhen Hao Xi,Ling Zhao
Nylon 6 extract concentrate, namely, wastewater produced from industrial nylon 6 extraction unit, was hydrolyzed in subcritical water to efficiently decrease the cyclic dimer (CD) content. The CD equilibrium conversion reached a maximum when the initial water content ranged from 0.40 to 0.45 g/g; specifically, a CD conversion of 94.3 % was achieved at the hydrolysis temperature of 543 K and an initial water content of 0.40 g/g. A kinetic model including both acid- and base-catalyzed mechanisms was developed. The model predictions were in good agreement with the experimental results. The hydrolysis reaction constants increased significantly with increasing subcritical water content. By considering the effects of subcritical water on the individual reaction constants, the kinetic model could reproduce the experimental results over a wide range of initial water contents. Hopefully, the developed kinetic model will be applied in the design of a novel nylon 6 extract liquor recycling process.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
·
IF 2.714
Baidi Chen,Jin Wang,Lingjun Kong,Xiaoxia Mai,Ningchao Zheng,Qiaohui Zhong,Jiayi Liang,Diyun Chen
Adsorption of uranium (U) from real mine contaminated water (U 1.652 mg/L) by phosphate rock apatite (PRA) was investigated in the batch experiment and flow column test system. In batch experiment, the equilibrium adsorption amount is 0.1133 mg/g with the highest uranium removal efficiency of 76.89% under the ratio of solid to liquid (1:100) in 15 h. And the pH of wastewater became neutral (pH 7.51) from acidic (pH 3.88) after adsorption equilibrium. The saturated adsorption amount (0.2021 mg/g) in batch experiment is higher than the maximum accumulative adsorption amount (0.0684 mg/g) in column experiment. Langmuir model and pseudo-second order kinetic model are fitted well and, indicating that PRA is a favorable adsorbent with monolayer coverage and a chemisorption for uranium. Moreover, the surface morphology of the adsorbent by SEM confirmed the surface changes after uranium adsorption. XRD spectra showed that two new mineral phase of Metaankoleite [K(UO 2 )(PO 4 )·3H 2 O], Chernikovite [H 2 (UO 2 ) 2 (PO 4 ) 2 ·8H 2 O] have been generated on PRA after uranium adsorption, but which were trace for relatively low uranium concentration in tested polluted water. In addition, the FT-IR spectra results confirmed the uranium in contaminated water was adsorbed onto the PRA in the form of (O = U = O) 2+ with the participation of the PO 4 3– in binding of it.
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RSC Advances
·
2016
·Vol. 6
·期 30
·25420-25426
·
IF 3.289
Yang Li,Caiyun Liao,Shanshan Huang,Hui Xu,Baozhan Zheng,Juan Du,Dan Xiao
In the paper, a novel fluorescent sensor L based on phenolphthalein derivative bis-Schiff base was synthesized and characterized. Chemosensor L was found to be an excellent specific receptor for Al3+ via significant fluorescent enhancement resulting from the inhibition of an internal charge transfer (ICT) process and an efficient chelation-enhanced fluorescence (CHEF) effect. A good linear relationship was obtained in the Al3+ concentration from 0 to 50 μM with the detection limit reaching below 15 nM. Moreover, the addition of 2 equiv. of Cu2+ can almost completely quench the emission intensity of L due to a ligand–metal charge transfer (LMCT) process. The resulting L–Cu(II) complex showed a satisfactory sensing ability toward cysteine (Cys) through naked-eye and recovered fluorescence intensity with the detection limit of 0.36 nM. The fluorescence recovering process was caused by the stronger coordination ability of Cys with Cu2+ than with L and therefore free L was released from the L–Cu(II) complex. Furthermore, the sensor was used to detect Cys in practical samples with a high accuracy.
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POLYMER INTERNATIONAL
·
2017
·Vol. 66
·期 11
·1633-1639
·
IF 2.07
Nafeesa Mushtaq,Lala Rukh Sidra,Guofei Chen,Yongmei Tang,Lubo Xu,Xingzhong Fang
A series of cardo based asymmetric polyimides containing bulky rigid naphthalimide and phthalimide groups were prepared from asymmetric monomer bishaloimide and bisphenols by solution polycondensation. Bishalo(naphthalimide-phthalimide) monomers containing different terminal leaving groups (Cl, F, NO 2 ) were synthesized, and the reactivity difference of these monomers was compared for the successful synthesis of polyimides. The inherent viscosities of the polyimides were in the range 0.51 − 0.60 dL g −1 in N -methyl-2-pyrrolidone at 30 °C. These polyimides demonstrated good organosolubility and mechanical properties with tensile strengths of 93 − 120 MPa, tensile moduli of 3.5 − 5.3 GPa and elongations at break of 2.8% − 4.3%. The polyimides showed high glass transition temperatures ( T g ) ranging from 330 to 363 °C. The 10% weight loss ( T 10% ) of asymmetric polyimides reached 436 − 500 °C in nitrogen and 417 − 476 °C in air. The water uptake of the polyimides was in the range 0.35% − 0.72%. © 2017 Society of Chemical Industry
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CHEMICAL PHYSICS LETTERS
·
2017
·
IF 1.815
Shiliang Wei,Kun Jia,Hongguo Shou,Xuefei Zhou,Pan Wang,Xiaobo Liu
Polyarylene ether nitrile (PEN) is traditionally used as high performance thermoplastics in various advanced engineering materials fields. However, the preparation of optically active PEN based materials, especially in aqueous solution, is still a great challenge. In this work, the side chain carboxylated PEN can be readily dissolved in alkaline solution but showing strongly quenched luminescence. Fortunately, the cationic surfactant of cetyltrimethylammonium bromide (CTAB) was able to recover the fluorescence emission of water soluble PEN, which can be subsequently quenched by Fe 3+ ions, leading to the selective determination of Fe 3+ ions in aqueous solution.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Jiaqi Xu,Qilang Lin,Yan Yu,Dongyang Chen,Zhuoliang Ye
Linear fluorinated poly(arylene ether)s with and without pendent allyl groups (CFPAE and FPAE) were successfully polymerized from decafluorobiphenyl at room temperature . The subsequent SN 2 nucleophilic substitution of the remaining F atom on CFPAE and FPAE with sodium 4-hydroxybenzenesulfonate yielded SCFPAE and SFPAEs in one simple step under mild conditions. The chemical structures of the polymers were confirmed by 1 H NMR and FT-IR. The ion exchange capacity (IEC), inherent viscosity, water uptake, swelling ratio, proton conductivity , mechanical property, thermal stability, and oxidative stability of the SFPAEs were characterized. The experimental results revealed that the IEC of the SFPAEs can be facilely controlled by the loading amount of sodium 4-hydroxybenzenesulfonate in the reaction mixture. The SFPAE-20 with an IEC of 2.0 mmol g −1 exhibited an in-plane proton conductivity of 106 mS cm −1 at 30 °C, higher than that of Nafion N212. More importantly, the SFPAEs showed significantly enhanced oxidative stabilities compared to sulfonated non-fluorinated analogs in literature. While there was still a trade-off between proton conductivity and mechanical strength as often seen for homogeneous systems, the SFPAEs were demonstrated to be promising candidates for proton exchange membranes .
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Foods
·
2024
·Vol. 13
·期 16
·2539
·
IF 4.7
Zhonghui Liu,Tieliang Liu,Run Liu,Qi Zhou,Yandaizi Zhou,Yi Zhang,Mingming Zheng
Rapeseed oil is a widely consumed edible oil that contains varieties of beneficial micronutrients such as tocopherols and phytosterols; however, the high acid value due to increased free fatty acid can imperil the oil quality and safety. This paper proposed the enzymatic deacidification for high-acid rapeseed oil and simultaneous production of functional diacylglycerols (DAGs) catalyzed by self-made immobilized lipase CALB@MCM-41-C8. The results indicate that the carrier of molecular sieve MCM-41 exhibited a sufficient surface area of 1439.9 m2/g and a proper pore size of 3.5 nm, promoting the immobilization of lipase CLAB. Under the optimal reaction conditions, the acid value of rapeseed oil was largely decreased from 15.3 mg KOH/g to 1.7 mg KOH/g within 3 h, while DAG content was increased from 1.2% to 40.2%. The antioxidant stability of rapeseed oil was also increased from 4.3 h to 7.6 h after enzymatic deacidification. Besides, the deacidified rapeseed oil exhibited fatty, bitter almond aromas, compared to the picked-vegetable, spicy, and pungent aromas for high-acid oil. Finally, the catalytic stability and applicability of CALB@MCM-41-C8was validated, thus demonstrating the great potential of CALB@MCM-41-C8in green refining of edible oils and sustainable synthesis of functional lipids.
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JOURNAL OF FOOD BIOCHEMISTRY
·
2025
·Vol. 2025
·期 1
·7434957
·
IF 4.2
Xiumin Zhang,Wenfeng Du,Danni Zhang,Na Zhang,Yuan Liu,Shui Jiang
Background: Rapeseed oil is the most widely consumed vegetable oil globally. However, the key aroma-active compounds of rapeseed oil and their changes during storage are unclear. In this study, the flavor of rapeseed oil during storage was characterized by physicochemical analysis, sensory evaluation, electronic nose (E-nose), and gas chromatography–olfactometry (GC–O). Results: Peroxide value, acid value, and anisidine value gradually increased, while polyphenol content, tocopherol content, and sterol content showed a downward trend during storage. The E-nose combined with the linear discriminate analysis (LDA) method could discriminate rapeseed oil with different storage times. The sensory attributes changed significantly from distinctive pickled aroma to rancid, green, and fried aromas during storage. This work provides the aroma-active markers based on GC–O–MS for the quality evaluation of rapeseed oil during storage. A total of 136 volatile compounds were detected by GC–MS, and 16 odorants were identified by GC–O combined with aroma extract dilution analysis (AEDA). Finally, seven aroma-active volatile compounds (3-butenyl isothiocyanate, 2(5H)-furanone, 2-methoxy-4-vinylphenol, ( E )-2-octenal, ( E,E )-2,4-heptadienal, ( E,E )-2,4-decadienal, and 3-methyl-pentanoic acid) with the odor activity values (OAVs) greater than 1 were identified as potential key aroma volatiles that contributed significantly to the overall aroma of rapeseed oil. Conclusion: This study provided a comprehensive method to monitor the flavor quality change of rapeseed oil during storage. The identified volatile compounds could be the markers to characterize the quality changes of rapeseed oil during storage.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Jialin Zhang,Tao Wang,Xialei Lv,Shuye Zhang,Jinhui Li,Guoping Zhang,Rong Sun
The increasing demand for high performance and miniaturization of electronic devices creates an urgent need for solder resist materials with excellent comprehensive properties. We report a photothermal dual-curable solder resist dry film (SRF) material. The preparation method and performance characteristics of epoxy-based SRF modified with acrylic acid, 2,2-bis(hydroxymethyl)propionic acid (DMPA), and cis-1,2,3,6-tetrahydrophthalic anhydride were systematically studied and also compared with the commercially available product. With the introduction of DMPA, SRF-2 exhibits excellent adhesion, and the peel strength between SRF-2 and copper increased from 0.33 to 0.45 N/mm, a 36% increase; this improvement was achieved by introducing a certain proportion of hydroxyl groups into the epoxy resin molecular chain. Additionally, its dielectric constant decreased from 3.73 to 3.38 and the room-temperature modulus increased from 5.1 to 5.4 GPa. Moreover, SRF-2 exhibits excellent thermal stability, hydrophobicity, and photolithographic performance, indicating potential application prospects in integrated circuits.
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AICHE JOURNAL
·
2024
·
IF 3.5
Jingwei Zhang,Xiaohui Zhang,Jianhong Xu,Zhuo Chen
In this work, the liquid–liquid two-phase pressure drop and mass transfer characteristics in micro-packed beds with different shaped packing are investigated. The experimental results show that the liquid–liquid mass transfer performance of micro-packed bed is significantly affected by both apparent flow rates and phase ratio. By changing the characteristic size of the micro-packed bed, the experimental results show that the average volume mass transfer coefficient has no obvious correlation with the length of the bed, which indicates that the flow and dispersion behavior along the length of the micro-packed bed is basically stable. By considering dispersion strengthening, vortex strengthening and size effect, a semi-empirical model for predicting liquid–liquid mass transfer performance in a micro-packed bed is established for the first time. The model is in good agreement with the experimental results and has strong applicability to various shaped packings. In addition, by considering the contribution of inertia force, viscous force and interfacial tension to energy dissipation, a semi-empirical model of liquid–liquid two-phase pressure drop in a micro-packed bed is established. The pressure drop prediction model can also be applied to different shaped packings.
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