JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 2
·522-531
·
IF 2.047
Zheng Jie,Chen Jiali,Tang Yu,Shen Kaiyuan,Xiang Yujie,Shen Lanxian,Ge Wen,Yang Peizhi,Deng Shukang
In this study, β -Zn 4 Sb 3 was prepared using the Zn-NaCl mixed-flux method based on the stoichiometric ratio of Zn/Sb/NaCl = (4− x ):3:(7+ x ) ( x = 0, 0.1, 0.2, 0.3). X-ray diffraction results showed that all samples were hexagonal rhombic crystal structures with the space group \(R\overline{3}c\) . A second phase of ZnSb was detected in the samples with x = 0.2 and x = 0.3. In addition, the crystal-cell volume and lattice parameter of all samples increased for the larger ion radius of Na + than Zn 2+ . The transmission electron microscopy image and corresponding area electron diffraction pattern demonstrated that the prepared samples had a complete crystal structure. All samples had hole conduction and exhibited p-type conduction behavior. The carrier concentration of the material increased with increased Na content and decreased Zn, ranging from 8.89 × 10 19 cm −3 to 17.82 × 10 19 cm −3 . Moreover, the thermal conductivity ( κ ) of x = 0–0.2 samples decreased with increased Na content; however, the sample with x = 0.3 had a higher κ owing to the appearance of a ZnSb phase. Thermogravimetric differential thermal analysis showed that no weight loss occurred below the melting point. Eventually, the sample with the nominal composition of β- Zn 3.8 Sb 3 NaCl 7.2 achieved a ZT value of 1.43 at 690 K.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Mengmeng Jia,Wen-Hai Zhang,Xuehong Zhang,Ming-Jie Yin,Shuo Gu,Xinmiao Hu,Hongxia Guo
Preparation of membranes with loose structure is often required for excellent small organic molecules desalination, but remains a grand challenge. In this work, a loose thin film composite (TFC) membrane was fabricated via interfacial polymerization of hydroxypropyl-β-cyclodextrin (HP-β-CD) and trimesoyl chloride. Besides, tannic acid was added in the aqueous phase to boost the rejection rate of the membrane by reducing the “outer space” distance among HP-β-CD. The resulting membrane exhibited an optimal permeability of 82.9 L m −2 h −1 bar −1 along with antibiotic desalination efficiency (94.8 % for tetracycline hydrochloride and 8.5% for NaCl). Moreover, experiment results demonstrate that the tannic acid incorporated HP-β-CD-based polyester (TIHP) membrane was also endowed with enhanced chlorine resistance and antifouling ability deriving from its rich hydroxyl and polyester structures, which makes the membrane promising for the purification of antibiotics in pharmaceutical fields.
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MACROMOLECULES
·
2023
·
IF 5.5
Xiangbin Sun,Peng Cao,Xue Bai,Yufeng He,Pengfei Song,Rongmin Wang
Bacterial infections have emerged as the primary adversary, causing severe health complications and incalculable economic losses. To tackle this issue, it is imperative to develop novel and highly effective antimicrobial agents. In this study, a series of double-armed antibacterial polymers (CD-QPS) were synthesized via Steglich esterification and reversible addition–fragmentation chain transfer polymerization (RAFT) polymerization. Notably, this represents a significant breakthrough in the field of antibacterial polymers derived from the quaternary phosphonium salt ionic liquid (QPSIL) and β-cyclodextrin (β-CD) via RAFT polymerization. Leveraging the controllable polymerization degree offered by RAFT and the functional group density resulting from its three-dimensional topological structure, CD-QPS exhibited exceptional antibacterial activity against Escherichia coli and Staphylococcus aureus with bacteriostatic rates reaching 100 and 99.9%, respectively. What is even more exciting is that CD-QPS demonstrated minimum inhibitory concentrations (MICs) as low as 20 μg mL–1 for E. coli and 40 μg mL–1 for S. aureus, surpassing those reported for other antibacterial materials as well as the standard drug ampicillin (32/62.5 μg mL–1). Furthermore, preservation tests conducted on oranges confirmed that CD-QPS exerted long-term antibacterial effects for an astonishing duration of 14 days. Additionally, the cytotoxicity test verified good biocompatibility of CD-QPS. In brief, we not only provide a new strategy for constructing double-armed polymers known as CD-QPS but also introduce a novel antimicrobial agent with high efficiency and long-term performance.
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Arabian Journal of Chemistry
·
2023
·
IF 6
Haijun Cheng,Min Liang,Suyi Dai,Xianrui Lu,Qilin Huang,Fang Lai,Li Ma,Weiguang Li,Xiongmin Liu
α-Pinene, β-pinene and turpentine are renewable resources that are widely used in fine chemicals, fuels and other applications, and the safety of their production, transport and use should be considered. In this work, the characteristics and hazardous of the oxidation process of α-pinene, β-pinene and turpentine were investigated by using a novel mini closed pressure vessel testing system (MCPVT). The oxidation products were resolved by gas chromatography-mass spectrometry (GC–MS). The results showed that α-pinene, β-pinene and turpentine were stable under nitrogen atmosphere and very active chemically under oxygen atmosphere. The activation energies ( E a ) of α-pinene, β-pinene and turpentine were calculated to be 78.87, 109.69 and 98.82 kJ/mol, respectively, using pressure–time (P-t) curves. So, the reaction activity sequence was α-pinene > turpentine > β-pinene. The peroxide concentrations of α-pinene (363 K), β-pinene (358 K) and turpentine (363 K) could reach 81.94, 84.70 and 75.76 mmol/kg, respectively, at relatively low temperatures. 0.6 g of α-pinene exploded at a system temperature of 369 K and an oxygen pressure of 1.23 MPa. 0.6 g of β-pinene also exploded at a system temperature of 373 K and an oxygen pressure of 1.27 MPa. 0.4 g of turpentine experienced thermal runaway at a system temperature of 384 K and an oxygen pressure of 0.81 MPa. The major oxidation products of α-pinene are α-campholenaldehyde, laevo-pinocarveol, verbenol, verbenone, bicyclo (3.1.1)heptane-2, 3-diol, 2, 6, 6-trimethyl, 2-cyclohexen-1-ol, 2-methyl-5-(1-methylethenyl)-, (1R,5R)-rel-, cyclobutaneacetic acid, 3-acetyl-2, 2-dimethyl, myrtenol and myrtenal. The major thermal runaway products are water, ethanol, acetone, acetic acid, 2-pentanone, propyl acetate, toluene, cymene and methylacetophenone. The major oxidation products of β-pinene are nopinone, laevo-pinocarveol, pinocarvone, myrtenol, myrtenal and perillyl alcohol. The major thermal runaway products are water, ethanol, acetone, n-ethyl propanoate, toluene, butyl acetate, cymene, apocamphor, nopinone, bornyl formate, methylacetophenone and dihydronopol. The oxidation products and thermal runaway products of pinene were significantly different. Possible reaction pathways for α-pinene and β-pinene are proposed.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 18
·10979-10989
·
IF 4.22
Wang Jing,Wang Tao,Hu Yimeng,Zhang Xiaonan,Ma Yanyan,Lv Hongmin,Xu Shanshan,Wang Yinglong,Jiang Zike
In this work, novel β -cyclodextrin-enhanced Eu 3+ luminescence aggregates (CELAs) with bright red fluorescence of Eu 3+ are prepared. These CELAs exhibit the quick response and highly selective sensitivity at the concentration of 50 µM Fe 3+ . A series of ligands (such as TTA, phen, β -cyclodextrin) sensitizes the luminescence of Eu 3+ (the “antenna effect”), and metal ions–ligands interactions can differentially alter the antenna effect of ligands toward Eu 3+ . Addition of EDTA to chelate Fe 3+ restores the fluorescence, indicating that the fluorescence quenching in the presence of Fe 3+ is reversible. This research provides that CELAs integrate these merits of superior lanthanide fluorescence and the amphiphilia property of β -cyclodextrin ( β -CD). It is a unique system with enhancement Eu 3+ luminescence in ethanol–water system and will be applied for aqueous solution detection sensor with high selectivity and reversibility for Fe 3+ . On the other hand, the on-off fluorescence property of the CELAs is convenient for environmental detection system.
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ACS Omega
·
2021
·
IF 3.512
Jiajun Li,Ming Guo,Yan Shao,Hongwei Yu,Kaijie Ni
To improve the efficiency of electrochemical degradation of wastewater, lead dioxide was synthesized by a hydrothermal method with low cost, simple operation, and high conversion rate. β-PbO2/HNT composites were prepared by a hydrothermal method with Halloysite nanotubes (HNTs) and β-PbO2. The PbO2/HNT/ITO electrode was prepared by modifying the β-PbO2/HNT composite on an indium tin oxide (ITO) conductive glass electrode. The morphology of the material was characterized by scanning electron microscopy and transmission electron microscopy. The electrochemical performance of the electrode was measured by cyclic voltammetry, the galvanostatic charge–discharge method, and the AC impedance method. Electrolysis of typical dye wastewater by electrochemical oxidation was carried out. The effect of electrochemical degradation of wastewater with new electrodes was investigated and the degree of electrodes falling off was compared. The solubility of electrodes was investigated by inductively coupled plasma mass spectrometry lead element analysis of wastewater. The results showed that the β-PbO2/HNT electrodes were prepared successfully and had good charge–discharge performance and lifetime. The removal rate of electrolytic dye wastewater was 85.86%, and the degradation effect was better than that of pure PbO2 electrodes. In this work, a new type of β-PbO2/HNT/ITO electrode has been prepared, which improved the degradation efficiency of wastewater and opened up the prospect of HNT application.
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JOURNAL OF CRYSTAL GROWTH
·
2021
·
IF 1.797
Qi Pan,Honglei Zhang,Xueyong Guo,Wanjun Zhao,Xuekun Fan
In this study, the effects of dopamine, binder and plasticizer on the crystal transformation of β-HNIW were investigated. By a simple preparation method, dopamine, plasticizer and binder were coated on the surface of β-HNIW. The characterization results of SEM , DSC and XRD show that the four dopamine polymers, three binders and four plasticizers form a stable polymer film on the surface of β-HNIW crystal. The crystal transformation temperature of β-HNIW crystal coated with dopamine polymer is delayed to varying degrees, and the crystal transformation temperature is significantly improved about 40 °C. Dopamine polymers effectively inhibit the crystal transformation of β-HNIW, improving the thermal safety of β-HNIW. The three binders have inhibitory effect on the crystal transformation of β-HNIW, and four plasticizers promote the crystal transformation of β-HNIW. Dopamine and binder have an inhibitory effect on the β-HNIW crystal transformation, while the plasticizer has a promoting effect on the β-HNIW crystal transformation.
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Environmental Science-Nano
·
2020
·Vol. 7
·期 10
·3124-3135
·
IF 7.683
Nan Li,Li Yang,Xiaoyan Ji,Jia Ren,Baoyu Gao,Weiqiao Deng,Zhining Wang
Uranium (U) is the main raw material in the nuclear industry and is also one of the most hazardous contaminants because of its radioactivity and chemical toxicity. In this study, we present a highly selective and efficient strategy for U(VI) separation and recovery by using a succinyl-β-cyclodextrin-based membrane (SβCDM). The prepared SβCDM achieved equilibrium in 60 min and the equilibrium isotherm was fitted well by the Langmuir model with a maximum U(VI) capacity of 378.8 mg g−1. The maximum dynamic adsorption capacity of SβCDM reached 500.0 mg g−1 under 1 bar operation pressure within 20 min. Moreover, SβCDM could be easily regenerated with a U(VI) recovery of 90% even after ten adsorption–desorption cycles. Noteworthily, SβCDM exhibited a high selectivity for U(VI) when other competitive metal ions and anions existed. The density functional theory (DFT) calculations and extended X-ray absorption fine structure studies demonstrated that the synergistic spatial effect and coordinate effect boosted the overall uranyl affinity of SβCDM. We also prepared membrane modules with great U(VI) adsorption performance in natural seawater. These findings highlight many advantages of SβCDM over traditional membrane-type adsorbents in U(VI) extraction.
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Catalysts
·
2020
·Vol. 10
·期 3
·302
·
IF 3.52
Meng Guo,Zhen Wei,Jianming Yang,Zunyuan Xie,Weiqiang Zhang
In the palladium-catalyzed C−C coupling reaction, electron-rich phosphine ligands and a catalytic amount of catalyst loading are required in most cases. Herein, a bench-stable, easily modified and less toxic alkynone was utilized in palladium-catalyzed Sonogashira coupling to replace conventional phosphine ligands. With 1-(4-methoxyphenyl)-3-phenyl-2-yn-1-one (L2) as the ligand, catalyst loading was reduced to 5-10 ppm. In this newly developed catalytic system, a variety of (hetero)arene iodines and alkynes could be tolerated, resulting in good yields of the corresponding cross-coupling products.Keywords:α;β-alkynone;Pd-catalyzed C−C coupling;π-acidicity
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Xuemeng Jia,Ning Yang,Xuchao Qi,Li Chen,Yiping Zhao
A novel bio-based zein- graft -β-cyclodextrin film was synthesized for cholesterol adsorption at room temperature. Immobilization of β-cyclodextrin (β-CD) to zein was achieved by the Maillard reaction and the zein- graft -β-CD powders showed higher glass transition temperature and higher solubility in water. Zein- graft -β-CD films, prepared by solvent evaporation casting, showed excellent capacity for cholesterol adsorption. The F 1:1 has the best adsorption properties, and the maximum adsorption capacity can reach 5.70 ± 0.56 mg cholesterol/g film. The adsorption cholesterol mechanism of zein- graft -β-CD film was correspond to the pseudo-first order kinetic model. In addition, the zein- graft -β-CD film retained an adsorption capacity of 3.10 ± 0.89 mg cholesterol/g film after three reuses. Using composite enzyme (1 mg/mL papain and 1 mg/mL amylase), the film (F 1:1 ) degradation reached 98.81% in 1 week. These results suggest that zein- graft -β-CD film has potential as a nature-based adsorbent for cholesterol adsorption and could be used in the food industry.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2020
·Vol. 35
·期 2
·455-463
·
IF 0.64
Shan Xueying,Han Ji,Song Yan,Xing Zhixiang,Li Jinchun
In order to improve the efficiency of β -CD, the inclusion complex of β -CD and resorcinol bisdiphenylphosphate (RDP) ( β -CD@RDP) was prepared, which β -CD was as the host component and RDP was as the guest. The structure and thermal stability property of β -CD@RDP was also characterized. EP/ β -CD@ RDP composites were prepared by adding β -CD@RDP into EP matrix. The results of thermogravimetric test showed that the flame retardant systems could effectively increase the corresponding temperature of EP matrix to reach the maximum thermal decomposition rate, and exhibited good char-forming property. When the amount of β -CD@RDP in EP was 20wt%, the limiting oxygen index (LOI) value of EP was increased to 26.5% from 19.8%, and the vertical burning test (UL-94) reached V-1 level. The cone calorimeter test indicated that 20wt% loading in EP could reduce the peak of heat release rate (PHRR) and the total heat release (THR) of EP by 94.7% and 93.4% respectively, and the peak of smoke production rate (PSPR) and the total smoke production (TSP) was reduced by 16.7% and 22.2%, respectively. Therefore, the addition of β -CD@RDP could reduce the fire risk of EP effectively.
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LANGMUIR
·
2020
·
IF 3.557
Junnan Yang,Wei Liu,Yan Sun,Xiaoyan Dong
Deposition of amyloid-β (Aβ) aggregates in the brain is a main pathological hallmark of Alzheimer’s disease (AD), so inhibition of Aβ aggregation has been considered as a promising strategy for AD prevention and treatment. Black phosphorus (BP) is a 2D nanomaterial with high biocompatibility and unique biodegradability, but its potential application in biomedicine suffers from the rapid degradability and unfunctionability. To overcome the drawbacks and broaden its application, we have herein designed an Aβ inhibitor (LK7)-coupled and polyethylene glycol (PEG)-stabilized BP-based nanosystem. The PEGylated-LK7-BP nanosheets (PEG-LK7@BP) not only exhibited a good stability but also demonstrated a significantly enhanced inhibitory potency on Aβ42 fibrillogenesis in comparison with its counterparts. This elaborately designed PEG-LK7@BP stopped the conformational transition and suppressed the fibrillization of Aβ42, so it could completely rescue cultured cells from the toxicity of Aβ42 (by increasing the cell viability from 72 to 100%) at 100 μg/mL. It is considered that PEG-LK7@BP could bind Aβ species by enhanced electrostatic and hydrophobic interactions and thus efficiently alleviated Aβ–Aβ interactions. Meanwhile, the coupled LK7 on the BP surface formed a high local concentration that enhanced the affinity between the nanosystem and Aβ species. Finally, PEG could improve the stability and dispersibility of the nanoplatform to make it show an increased inhibitory effect on the amyloid formation. Hence, this work proved that PEG-LK7@BP is a promising nanosystem for the development of amyloid inhibitors fighting against AD.
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