ChemNanoMat
·
2021
·Vol. 7
·期 5
·553-560
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IF 3.154
Meihua Gao,Zhiyin Yao,Na Du,Quanhua Deng,Lijing Liu,Jianqiang Liu,Wanguo Hou
Graphical Sodium monododecylphosphate can form vesicles in alcohol/water mixtures. The vesicles show remarkable stability but are metastable in thermodynamics. Sodium monododecylphosphate (SDP), a typical single-chain amphiphile (SCA), exhibits extremely low solubility in water, which limits the investigation on its aggregation behavior. In the current work, we introduced short- and medium-chain alcohols into the SDP-water system to improve its solubility. An isotropic phase was found to be formed in the presence of alcohol with a suitable dielectric constant (11–25) or alkyl chain (2–7 carbons). In addition, vesicular, dendritic, and micellar structures were identified in the isotropic phase, depending on the composition of the SDP/alcohol/H 2 O ternary systems. The structure, stability, permeability, and formation mechanism of the vesicles formed in the SDP/ n -pentanol (NPT)/H 2 O system were investigated. The vesicles have a unilamellar structure, with size-selective permeability. They show remarkable stability upon long-term storage, exposure to high temperature, and freeze-thawing cycles, but are metastable in thermodynamics. The hydrogen bonding between SDP molecules plays an important role in the formation of vesicles. Furthermore, the SDP/NPT/H 2 O vesicles were used to construct three spatially segregated enzyme-loaded compartments to support a cascade enzyme reaction. The chemical signal transduction among the enzyme-loaded vesicles was achieved. This study provides a deeper understanding of the features of SDP vesicles and demonstrates their potential applications such as in biomembrane mimicking and micro-reactors.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Yingqian Wang,Jihong Sun,Tallat Munir,Bingying Jia,Anadil Gul
Clinoptilolite (CP) with various morphologies, such as spherical, flower, cylindrical, and disc-shape, were successfully synthesized in the presence of alcohol solvents with different carbon chain lengths. The structural and textural properties of the resultant CPs were characterized via XRD, SEM, TG-DSC profiles, TEM, NMR, FT-IR spectra, and N 2 sorption isotherms. The effect of the additive amount of various alcohol solvents on the induction (nucleation) periods and growth stages of synthetic CPs were detailed investigated. Their activation energies of induction ( E n ) and growth ( E g ) periods during crystallization intervals were calculated according to the Arrhenius equation, where the former being larger than the latter, indicating that nucleation is the key step during the whole synthesis of CPs. Particularly, the E n value gradually increased as the increasing chain-length of the used alcohol, but smaller than that without additive alcohols. These demonstrations implied that the presence of alcohol solvents is beneficial to promote the nucleation process of synthetic CP. Furthermore, their CH 4 and N 2 adsorption capacity and selectivity were preliminary explored, showing the highest selective factor of 5.58 at 0 °C for CH 4 /N 2 separation using flower-like CP as an adsorbent. These results suggested a promising adsorbent for wide applications in gas separation.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Hao Wang,Nianzu Zhang,Xiaopo Wang
In this work, the density and viscosity data for binary mixtures of dimethyl carbonate with 1-heptanol, 1-octanol, 1-nonanol, and 1-decanol were presented from 303.15 K to 333.15 K at atmospheric pressure over different concentration ranges. The density and viscosity measurement was carried out based on the vibrating-tube densimeter and Ubbelohde capillary viscometer, respectively. Derived properties, such as excess molar volumes and viscosity deviations, were calculated from the experimental values, and were correlated based on the Redlich-Kister equation. In addition, excess molar volumes and viscosity deviations of the studied mixtures were analyzed and compared with other DMC/1-alcohols mixtures reported in the literatures.
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JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Xiao-Hong Fan,Li-Tao Wang,Yuan-Hang Chang,Juan-Yan An,Ya-Wei Zhu,Qing Yang,Dong Meng,Yu-jie Fu
Establishing an efficient and eco-friendly extraction method of bioactive ingredients from plant materials is highly needed to insure a better human health by combating different diseases. In this work, a two-phase system formed by green and recyclable menthol-based hydrophobic deep eutectic solvent (DES) aqueous was synthesized and evaluated its application for simultaneous extraction of seven main target taxanes in the Taxus chinese needles. The formation of micelles from two-phase system in the menthol-based DES aqueous simultaneously enhanced the mass transfer and enrichment for target taxanes. Under the optimal conditions of menthol/1-butanol ratio 1:1 (mol/mol), water content 50%, solid-liquid ratio 1:30 g/mL, extraction time 30 min and ultrasonic power 250 W, the extraction yields of seven main taxanes were 1.27–2.65 folds higher than the conventional organic solvents. The recovery yields after enrichment with the two-phase system of the menthol-based DES aqueous were higher than 95.31%. Furthermore, the menthol-based DES aqueous could be recycled at least three times with perfect extraction efficiency for target compounds. This work proved that the natural menthol-based DES aqueous solution is an effective and non-toxic green extraction solvent, which has the potential to effectively extract phytochemicals from plant materials in the future.
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JOURNAL OF MOLECULAR STRUCTURE
·
2020
·
IF 2.463
Zhengjun Fang,Shengqiong Tan,Feng Wu,Yinchun Jiao,Chaktong Au,Yuting Wang,Jing Shen,Bing Yi
Solvent and substituent effects on the ultraviolet absorption properties of Schiff bases were targeted both experimentally and computationally. A wide set of X-PhCH = NPhCH = CHPh-Y were prepared for this study, and their maximum absorption wavelength ( λ max ) and the corresponding energy (υ max ) in thirteen solvents were measured. The results show that the λ max of the compounds ranges from 347 to 388 nm. With increase of electron withdrawing or electron donating ability of X or Y, a bathochromic shift is observed. Furthermore, the λ max values are sensitive to the properties of solvents, while the polarity of solvents alone fails to account for the trends of solvatochromism . Computational analyses based on density functional theory were conducted to elucidate the phenomena. The polarization effect of solvent on solute can be used to measure the effect of solvent, and polarizability parameter Δη is proved to be more effective to scale the solvent effects on UV absorption of the compounds. Finally, a quantitative model has been developed to express the effects of substituent and solvent on υ max . The derived model enables practical expression of the relationship between substituents, solvents and UV absorption.
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ATMOSPHERIC ENVIRONMENT
·
2020
·
IF 4.039
Fenghua Li,Shanshan Tang,Narcisse T. Tsona,Lin Du
Kinetics and mechanism of α-terpineol oxidation by OH radicals were studied in the aqueous phase under acidic condition, and the optical properties of the reaction products were examined. Using the relative rate method, the rate constant of α-terpineol reaction with OH radicals was determined to be (1.3 ± 0.3) × 10 10 M −1 s −1 . The reaction products were analyzed by gas chromatography-mass spectrometry (GC-MS) and the reaction mechanism was proposed. The absorbance changes of the products were monitored by a UV–vis spectrophotometer, and α,β-unsaturated ketone compounds were observed. A certain distribution of α-terpineol in the aqueous phase has the potential to be conducive to the formation of aqueous secondary organic aerosols. At the same time, in order to investigate the persistence of α-terpineol in the atmosphere, its lifetime towards reaction with OH in atmospheric water was determined to be 6.2 h and 1.0 h in urban and remote area, respectively.
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Analytical Methods
·
2022
·Vol. 15
·期 3
·361-367
·
IF 3.532
Chengjian Zhang,Sichen Li,Ruijie Zheng,Shengdi Tai,Kang Yang,Kun Zhang
Lower alcohols (C1–C7) have a close relationship with our lives and some of them are harmful to our body's health. For example, liquor mixed with a tiny amount of methanol is harmful to our health. Much of this study is about identifying one or two low-level alcohols. How to detect low-level alcohol and high-throughput and distinguish between analogues of alcohol remains a tremendous challenge. In this study, a new large ring Schiff base Sm(III) complex (Sm-2r) is synthesized with a double emission matrix using the template method. Its dynamic imine bond (CN) and organic ligands (H2L2r) with molecular rotor properties can respond to changes in viscosity and polarity in external environments. The PCA method is used to turn the data matrix into a fingerprint spectrum to distinguish different alcohols (C1–C7). Sm-2r enables the quantization of cyclopropyl and glycerol. Linear ranges of cyclopropanol and glycerol are 0–9.0% and 0–3.0% (v/v), respectively. In addition, Sm-2r has an excellent ability to distinguish the mixtures of n-PrOH and i-PrOH, C5H9OH and C6H11OH, n-PeOH and n-HeOH, 1,3-PDO and 1,2-PDO, MeOH and EtOH, 1,2-EG and 1,2-PDO at different volume ratios. We have provided a way to distinguish alcohol species based on their molecular polarity and viscosity.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2026
·
IF 4.1
Qi Junfeng,Liu Junhe,Hu Chanjuan,Wang Qingqing,Guo Yanhong,Zhang Mengdie,Hu Li,Lin Bin,Li Wansen
Excessive addition of ethyl maltol (EMA) to foods poses potential health risks, highlighting the need for reliable monitoring. Herein, an integrated Fe(III)-driven liquid-phase microextraction (LPME)–spectrophotometry system was developed for selective and high-throughput EMA determination. Fe(III) in the acceptor phase served dual roles: as a chemical trap achieving >90% extraction efficiency and as an in situ chromogenic probe enabling direct detection. This unique design combines membrane-mediated matrix exclusion with coordination-assisted extraction, resulting in enhanced sensitivity and improved resistance to matrix interference. Density functional theory calculations revealed that Fe(III) facilitated the forward extraction by reducing the transmembrane transfer free energy barrier while suppressing back-extraction via weakening EMA–membrane solvent interactions. Under the evaluated conditions, the system offered a broad linear range (7.8–1500 μM, R 2 > 0.999), low detection limit (0.67 μM), and satisfactory selectivity toward structural analogues. Validation in diverse food matrices yielded recoveries of 88–107% with good agreement with HPLC–UV ( R 2 > 0.99). The minimal solvent consumption, high throughput, and favorable greenness further highlight its practical utility. More than an EMA detection method, this work provides a proof-of-concept for the coordination-driven LPME strategy that intrinsically integrates sample preparation with in situ signal generation, offering new insights into the design of a mechanism-driven microextraction system. Graphical abstract
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Yingmin Yu,Xinlei Niu,Xiaocheng Zhang,Houchun Yan,Jinshan Wang
In order to remove epichlorohydrin from wastewater, liquid–liquid equilibrium behaviors in the systems {water + epichlorohydrin + solvents (1-hexanol/1-heptanol/2-octanol/1-nonanol)} were determined at 303.2 K under101.3 kPa. The partition coefficients and separation factors in each system were used to compare and discuss the effects of extraction. The σ-profiles were used to discuss the interactions of substances in this work. The experimental data were correlated with the NRTL and UNIQUAC models, to obtain the binary interaction parameters required for each system. The GMcal_TieLinesLL GUI tools were applied to verify the consistency of the binary interaction parameters.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Lu Dong,Shui Wang,Wenchao Ma,Dongxu Wang,Yixin Qu
In this paper, the solubility of levodropropizine, an important cough suppressant drug, in 13 pure solvents (including 8 alcohol solvents and 5 acetate solvents) was studied with the aid of a laser dynamic solubility-monitor device at a temperature from 283.15 to 323.15 K and atmosphere pressure. In the measured temperature range, the solubility of LVDP increases with increasing temperature and follows the following order: iso-butanol > iso-pentanol > n-hexanol ≈ n-heptanol > n-pentanol > n-propanol > n-butanol > iso-propanol > ethyl acetate > n-propyl acetate > n-butyl acetate > n-pentyl acetate > iso-propyl acetate. Three semiempirical models (modified Apelblat, three-parameter van’t-Hoff, and λh) and two activity coefficient models (Wilson and NRTL) were used to correlate solubility of LVDP as a function of temperature and the mixing thermodynamic properties of the 13 solutions were evaluated based on measured solubility and the parameter values of Wilson’s model.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Ruiyu Fu,Tingze Ren,Yanhui Zhang,Qingxin Lu,Xiaoli Guo,Xin Di
A new supramolecular solvent (SUPRAS) was synthesized using hexafluoroisopropanol (HFIP) as hydrogen bond donor and undecanol as hydrogen bond acceptor. Then SUPRAS was used as extraction solvent to enrich triazole fungicides in drinking water and beverages by liquid phase microextraction (LPME). Additionally, several variables that influence extraction efficiency were optimized, and the significant factors were investigated by Box-Behnken design. At optimum condition, the method shows desirable precision (RSDs less than 19.4%) and acceptable recovery (63.4%-112.1%). The low limits of detection and limits of quantitation of this method were found to be in the range of 1.0–5.0 μg/L and 5.0–20 μg/L, respectively. Compared with other analytical techniques, the method demonstrated comparable sensitivity, consumed less extractant (750 μL) and a shorter pre-treatment time (10 min). The formation mechanism of SUPRAS was investigated by density functional theory. The proposed methodology was green, sensitive, time-saving and successfully applied to determine triazole fungicides in drinking water and beverages, making it an alternative technique for the analysis of trace analytes with satisfactory sensitivity.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Liu Kai,Yang Hao,Jiang Yilan,Liu Zhaojun,Zhang Shumeng,Zhang Zhixue,Qiao Zhun,Lu Yiming,Cheng Tao,Terasaki Osamu,Zhang Qing,Gao Chuanbo
Metastable noble metal nanocrystals may exhibit distinctive catalytic properties to address the sluggish kinetics of many important processes, including the hydrogen evolution reaction under alkaline conditions for water-electrolysis hydrogen production. However, the exploration of metastable noble metal nanocrystals is still in its infancy and suffers from a lack of sufficient synthesis and electronic engineering strategies to fully stimulate their potential in catalysis. In this paper, we report a synthesis of metastable hexagonal Pt nanostructures by coherent growth on 3 d transition metal nanocrystals such as Ni without involving galvanic replacement reaction, which expands the frontier of the phase-replication synthesis. Unlike noble metal substrates, the 3 d transition metal substrate owns more crystal phases and lower cost and endows the hexagonal Pt skin with substantial compressive strains and programmable charge density, making the electronic properties particularly preferred for the alkaline hydrogen evolution reaction. The energy barriers are greatly reduced, pushing the activity to 133 mA cm geo –2 and 17.4 mA μg Pt –1 at –70 mV with 1.5 µg of Pt in 1 M KOH. Our strategy paves the way for metastable noble metal catalysts with tailored electronic properties for highly efficient and cost-effective energy conversion.
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