JOURNAL OF MEMBRANE SCIENCE
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2023
·
IF 9.5
Jing Dou,Shuo Han,Saisai Lin,Zhifu Qi,Feipeng Huang,Xiangdong Feng,Zhikan Yao,Jing Wang,Lin Zhang
Nanofiltration is a promising technology to recover dye from textile wastewater with highly saline for sustainable resource recovery. However, it is difficult for the conventional piperazine-based nanofiltration membranes, which usually have a tight polyamide matrix structure, to precisely separate dye and salt in wastewater. In this study, 5,5,6’,6’-tetrahydroxy-3,3,3’,3’-tetramethyl spirobisindane (TTSBI) with rigidly contorted structure has been used instead of piperazine as aqueous-phase monomer to fabricate polyarylate (PAT) nanofiltration membranes with quasi-PIMs structure via interfacial polymerization (IP) with three types of acyl chloride, i.e., rigid trimesoyl chloride (TMC), short-chain glutaryl chloride (GC) and long-chain sebacoyl dichloride (SDC). The contorted structure of TTSBI introduces extra microporosity in nanofiltration membranes, and the differentia of three acyl chlorides in molecular flexibility further endows with tailoring the stacking density of as-formed PAT networks. The PAT NF membranes thereby exhibited high permeability and tunable size-selectivity in desalination from dye effluent. Among these PAT membranes, TTSBI-TMC membranes had the highest water flux of 480.5 LMH, nearly 7-fold increase compared traditional PA NF membranes, whereas TTSBI-SDC membranes had the highest dye rejection of 97.4%, and TTSBI-GC membrane had the relatively balanced dye desalination performance with high rejection 95.4% for Congo Red and 8.3% for NaCl accompanied by high flux of 402.4 LMH. Therefore, this study provides a new prospective for the fabrication of highly permeable nanofiltration membranes for precise separation.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF FOOD SCIENCE
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2022
·Vol. 87
·期 3
·1342-1354
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IF 3.693
Jin-Yi Yang,Mei-Chan Xie,Xue-Cai Tan,Yuan-Xin Tian,Hong Wang,Zhen-Lin Xu,Ting-Ting Yuan,Yi-Mei Xiao,Yu-Dong Shen
The tadalafil-like compounds have appeared recently as adulterants in drinks and healthcare dietary supplements sourced from medicinal and edible food, which may cause illness and even death. In this work, the rationality of haptens was explored by computational chemistry and molecular simulation theories such as frontier molecular orbital (FMO)-based softness (S), three-dimensional (3D) structure, surface electrostatic potential (ESP), and lipophilic potential (LP). An antiserum from hapten H5 with the highest softness and maintaining the appropriate three-dimensional (3D) structure showed the optimal immunoassay performance, indicating an increasing softness was a critical factor for effective hapten. Based on the antibody induced by hapten H5, an indirect competitive enzyme-linked immunosorbent assay (icELISA) method for detecting multiple tadalafil-like adulterants was established. The icELISA showed a limit of detection (LOD), 50% inhibition concentration (IC 50 ), and a working range of 0.004–0.396, 0.89–4.27, and 0.094–16.71 ng/ml for tadalafil, amino tadalafil, acetamino tadalafil, nortadalafil, and N-desmethyl ent-tadalafil, respectively. The spiked recoveries of tadalafil-like adulterants in samples ranged from 84.9% to 116.2%. The results of the icELISA and HPLC-MS/MS methods had a good correlation for real samples with the R 2 of 0.9955. Specially, this work not only provided a convenient immunoassay method for measuring tadalafil-like adulterants in spirit drinks and dietary supplements in group-screening manner, but also suggested that softness was likely to be a general theory for rational hapten design. Practical Application Rapid monitoring of tadalafil-like adulterants in food samples is very necessary and important for consumers, regulatory agencies, and the food industry.
研究领域:
分析化学
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免疫学
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药物化学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 136
·期 18
·47405
·
IF 2.188
Guorong Qiu,Wenshi Ma,Yuanqi Jiao,Li Wu
Low-dielectric-constant aromatics, homopolyimide and copolyimide, were introduced. Homopolyimides were prepared by pyromellitic dianhydride (PMDA) as an anhydride monomer and 4,4′-oxydianiline (ODA), 2,2-bis[4-(4-aminephenoxy)phenyl]propane, 1,4-bis(4-aminophenoxy)benzene, or 1,3-bis(4-aminophenoxy)benzene as an amine monomer. The copolyimides were prepared with PMDA as an anhydride monomer, ODA as an amine monomer with the addition of 2,2-bis[4-(4-aminephenoxy)phenyl]propane, 1,4-bis(4-aminophenoxy)benzene, or 1,3-bis(4-aminophenoxy)benzene as another amine monomer. The polyimides were well characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, thermomechanical analysis, dielectric measurements, and tensile testing. The homopolyimide and copolyimides showed lower dielectric constants than the homopolyimide formed by ODA and PMDA. The results also indicate that the interchain distance, the quantities of phenyl ether, and the position of the substitute are factors that not only affected the thermal performance of polyimide by improving the molecular flexibility but also reduced the dielectric constant of polyimide by increasing the free volume of the molecular chain and decreasing the polarization points per unit volume. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47405.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
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2022
·
IF 4.01
Lan Fang,Yiming Ma,Yuntian Xiao,Zhonghua Li,Zhenguo Gao,Songgu Wu,Sohrab Rohani,Junbo Gong
The formation of multicomponent crystals depends on many factors; therefore it is extremely challenging to predict and select the appropriate coformers (CCFs) to prepare functional multicomponent crystals. In this study, we selected the 2,4-dichlorophenoxyacetic acid (2,4-D) molecule and 10 N-heterocyclic compounds with similar structures to investigate the main factors affecting the synthesis of multicomponent crystals. On screening of multicomponent crystals by solution crystallization, we obtained nine kinds of multicomponent crystals of 2,4-D with different colors, including a hydrate of the 2,4-D-PYE cocrystal. However, 1,3-bis(4-pyridyl)propane (BPP) failed to form multicomponent crystals with 2,4-D using the solution crystallization methods. The influence of CCF on the formation of multicomponent crystals was discussed from three aspects: hydrogen bond donor and acceptor capacity (molecular electrostatic potential (MEP) surface, hydrogen bond acceptor ability h_ema calculated by Molecular Operating Environment software, and interaction site-pairing energy differences (ΔEsite-pair)), thermodynamic enthalpy (the excess enthalpy ΔHex), and structural factors (molecular complementarity (MC) and molecular flexibility (Kier flex)). Molecular flexibility is the main reason no multicomponent crystals are formed between BPP and 2,4-D. A logistic regression calculation indicates that the formation of multicomponent crystals of 2,4-D is mainly affected by ΔEsite-pair and MEP values. The cases considered in this study not only expand the crystal structure landscape of the 2,4-D but also provide a reference for the effective prediction and design of multicomponent crystals, in general.
研究领域:
化学
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材料科学
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DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 15
·8608-8619
·
IF 3.049
Qi Chu,Ling Lin
The effect of molecular flexibility on the rheological and filtration properties of synthetic polymers used as fluid loss additives in water-based drilling fluid was investigated. A new synthetic polymer (PAANS) comprising acrylamide (AM), 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS), N-vinyl-2-pyrrolidone (NVP) and potassium 2,5-dihydroxybenzenesulfonate (DHBS) was synthesized, in which phenyl groups were introduced in the backbone. Two other comparative polymers, PAAN and PAANS, were also prepared following the same synthesis procedure. PAAN comprises AM, AMPS and NVP, while PAANS consists of AM, AMPS, NVP and sodium 4-styrenesulfonate (SSS). PAAN, PAAND and PAANS were characterized by 1H NMR and elemental analysis, and the molecular weight was determined by static light scattering (SLS). The rheological properties, filtration properties and performance sustainability were investigated. Using a rheological properties measurement test, the apparent viscosity (AV), plastic viscosity (PV) and yield point (YP) of the Na-MMT/PAAND system at a concentration of 2.0% were 18.0 mP s, 12.0 mP s and 6.0 Pa, respectively, after a thermal aging test at 240 °C for 16 h. These values are much higher than those of the corresponding Na-MMT/PAAN and Na-MMT/PAANS systems. The API filtration loss volume (FLAPI) and high-temperature/high-pressure filtrate volume (FLHTHP) of the Na-MMT/PAAND system at a concentration of 2.0% were 12.0 mL and 30.0 mL, respectively, after a thermal aging test at 240 °C for 16 h. These values are much lower than those of the Na-MMT/PAAN and Na-MMT/PAANS systems. Compared with PAAN and PAANS, PAAND presents the best performance sustainability after multiple shearing and thermal aging tests. At the same temperature, the order of maintaining rheological performance and controlling the FLAPI and FLHTHP was PAAND > PAANS > PAAN in Na-MMT/PAANS-based drilling fluid at high temperature. Increasing the percentage of rigid monomers in the backbone was found to be conducive to maintaining the rheological stability and improving the filtration properties at high temperature. The control mechanism of fluid loss was investigated through adsorption tests using the method of thermal filtration, assessing particle size distribution on a laser diffraction particle size analyzer (LPSA) and examining filter cake morphologies using an environmental scanning electron microscope (ESEM). The results reveal that the introduction of rigid monomers into the synthetic polymer backbone can effectively improve the adsorption capacity of the polymer on the clay surface, obstruct the aggregation of clay particles, and improve the quality of filter cakes at high temperatures.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2020
·
IF 4.089
Mengwei Wang,Yiming Ma,Peng Shi,Shichao Du,Songgu Wu,Junbo Gong
There have been many studies on the preparation of cocrystals based on the synthon structures, but the synthons cannot completely guarantee the formation of cocrystals. On the basis of the widespread presence of the amino-pyridine synthon, we selected nimesulide (NMS) as the host component and a series of pyridine analogues (pyrazine (PYE), 4,4′-bipyridine (BP), trans-1,2-bis(4-pyridyl)ethylene (BPE), 1,2-bis(4-pyridyl)ethyne (BPY), 1,2-bis(4-pyridyl)ethane (BPA), and 1,3-bis(4-pyridyl)propane (BPP)) as coformers and thoroughly explored the difference in the ability of cocrystal formation. We successfully obtained four new cocrystals of NMS-BP/BPE/BPA/BPY, while cocrystals of NMS and PYE/BPP were not identified. By means of structural analysis and theoretical computation, we believe that PYE, with the weakest H-bond acceptor capacity and insufficient benzene ring, has difficulty in constructing a three-dimensional structure with NMS through effective N–H···N H-bonds and π–π stacking. Molecular flexibility could be a great resistance to form a cocrystal between BPP and NMS. Through quantitative calculation of Ridge and Lasso regression, it is found that the molecular electrostatic potential (MESP), h_ema (sum of hydrogen bond acceptor strengths), Kier flex (molecular flexibility), and the horizontal distance of two N atom projections of coformers have a descending effect on the cocrystal formation.
研究领域:
药物化学
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晶体工程
·
物理化学
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产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Yu Liu,Boyang Fu,Weilong He,Wenbo Qiu,Xiangting Ren,Panfeng Zhao,Weizhao Cai
The coordination compound copper(II) acetylacetonate, [Cu(acac)2], exhibits remarkable elastic flexibility due to the reversible rotation of molecules when the crystal is twisted or bent without loss of its crystallinity. The effects of external stimuli, including heat and strain, have been intensively studied on this material, but its mechanical response to the pressure has not yet been reported. Using the high-pressure single-crystal X-ray diffraction method, we show the herringbone-type [Cu(acac)2] demonstrates remarkable structural changes in molecular orientations toward the (001) plane under compression, without the occurrence of phase transitions. The alterations in molecular packing arrangements result in the emergence of unusual negative linear compressibility (NLC) of −6.2(6) TPa–1 along the b axis over the pressure range of 0.1 MPa–6.19 GPa. Moreover, synchrotron powder X-ray diffraction and Raman spectroscopy measurements demonstrate that the ambient-pressure phase is robust and can be stabilized at least to 10 GPa. In addition, the bandgap exhibits a slight reduction of ∼0.2 eV as the pressure is increased to 10.10 GPa, and the sample returns to its original state upon complete pressure release. Our findings suggest that the NLC behavior may be present in a diverse range of unidentified herringbone-type molecular crystals, which differs from the extensively researched hinged wine-rack frameworks.
研究领域:
材料化学
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晶体工程
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高压物理
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分子晶体
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固体力学性能
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）