WATER AIR AND SOIL POLLUTION
·
2017
·Vol. 228
·期 8
·1-17
·
IF 1.702
Zeng Anrong,Zeng Anran
In this paper, quaternized β-cyclodextrin–montmorillonite composite (QCD-MMT) was obtained and absorption properties of Cr(VI), methyl orange and p-nitrophenol were studied. QCD was prepared by 2,3-epoxypropyltrimethylammonium chloride and β-cyclodextrin (β-CD). QCD-MMT was obtained by reaction between QCD and montmorillonite suspensions, which could be attributed to the montmorillonite cation ion exchange properties. β-CD cavities of this composite were expected to capture organic molecules through inclusion, while montmorillonite units acted as the adsorption sites for metals. QCD-MMT was characterized by FT-IR, elemental analysis, XRD, SEM-EDX, and TGA. Adsorptions of Cr(VI), methyl orange, and p-nitrophenol were highly dependent on adsorbent dose, initial concentration, temperature, contact time, and pH. Adsorption kinetics of Cr(VI), methyl orange, and p-nitrophenol followed the pseudo-second-order model. Meanwhile, adsorption of Cr(VI) fit better in the Freundlich model, inferring a multilayer adsorption, while the adsorption of methyl orange and p-nitrophenol fit better in Langmuir model, inferring a monolayer adsorption. Thermodynamic analysis showed that the adsorptions were all endothermic process and could be spontaneous at given temperature range, except for Cr(VI), of which adsorption should be at much higher temperature. Overall, QCD-MMT exhibited potential for practical applications in the treatment of both metal ions and organic pollutants.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 7
·4001-4013
·
IF 1.674
Dong Zhen Ming,Wang Jia Na,Wang Wei,Chao Jian Bin,Wang Yu
A very simple Schiff Base derived from 1-Naphthylamine and 4-(Trifluoromethy) benzaldehyde (L) was prepared as a selective colorimetric and turn-on fluorescent sensor for hydrogen sulfate. In the CH 3 CN:H 2 O (3:2, v/v) solvent system, L shows a highly selective colorimetric response to HSO 4 − ions by changing its color from yellow to colorless immediately. In addition, the weakly fluorescent receptor L shows a highly selective enhancement of fluorescence intensity at 425 nm for HSO 4 − upon excitation at 320 nm. The recognition process is proven to be hardly influenced by the other tested competitive anions. The sensing is suggested to involve a hydrolysis process promoted by HSO 4 − which has been further supported by UV–Vis, 1 H NMR and HRMS spectroscopic studies. Applicability of L to detect HSO 4 − in tap water has been demonstrated. An easy-to-prepare test strip of L has also been made for the naked-eye detection of HSO 4 − in real samples.
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高影响因子
JOURNAL OF POROUS MATERIALS
·
2023
·Vol. 31
·期 2
·611-624
·
IF 2.6
Zhao Xiaoliang,Lu Liyuan,Wan Wenpeng,Zhang Chuanhui,Liu Yuan,Luo Li,Zhu Tianke,Zhang Weijie
Marine mussels can adhere to various surfaces in a liquid environment by utilizing pedicle filaments, with the adhesive properties primarily attributed to the structure of catechol, the main component of the filament. To overcome the challenges associated with the complex preparation process, high cost, and potential biological rejection of naturally extracted or recombinantly expressed mussel proteins, researchers drew inspiration from mussels and utilized an oxidative crosslinking approach to prepare adhesive hydrogel materials. However, the hydrogels prepared using this method exhibited inferior mechanical properties and low viscosity. To address these limitations, in this study, a kind of mussel-inspired dual-crosslinked hydrogel was prepared by dual cross-linking with hydroxypropyl chitosan (HPCS) and hyaluronic acid (HA), based on catechol, an adhesion component in marine mussel pedicle filaments. Comparative analysis revealed that the mussel-inspired dual-crosslinked hydrogel exhibited significantly higher adhesion strength (up to 33.96 kPa) and improved mechanical properties (energy storage modulus ranging from 489 to 1032 Pa) compared to the mussel-inspired oxidatively cross-linked hydrogel. In addition, the mussel-inspired dual-crosslinked hydrogel demonstrated favorable swelling (up to 136.54 ± 0.22%), degradation, sustained-release, bacteriostatic and biocompatible properties. These findings suggest a promising potential for future applications in the field of biomedical materials.
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高影响因子
Journal of Thermal Science
·
2023
·Vol. 33
·期 1
·383-393
·
IF 2.5
Dai Zhaofeng,She Xiaohui,Shao Bohan,Yin Ershuai,Ding Yulong,Li Yongliang,Zhang Xiaosong,Zhao Dongliang
Plastic crystal neopentyl glycol (NPG) exhibits colossal barocaloric effect with high entropy changes. However, their application is restricted in several aspects, such as low thermal conductivity, substantial supercooling effect, and poor springback properties. In this work, multi-walled carbon nanotubes (MWCNTs) with ultra-high thermal conductivity and high mechanical strength were selected for performance enhancement of NPG. The optimal mixing ratio was determined to be NPG with 3 wt% MWCNTs composites, which showed a 6 K reduction in supercooling without affecting the phase change enthalpy. Subsequently, comprehensive performance of the composites with optimal mixing ratio was compared with pure NPG. At 40 MPa, 390 J·K −1 ·kg −1 change in entropy and 9.9 K change in temperature were observed. Furthermore, the minimum driving pressure required to achieve reversible barocaloric effect was reduced by 19.2%. In addition, the thermal conductivity of the composite was increased by approximately 28%, significantly reducing the heat exchange time during a barocaloric refrigeration cycle. More importantly, ultra-high pressure release rate resulted in a 73.7% reduction in the springback time of the composites, offering new opportunities for the recovery of expansion work.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 5
·1-19
·
IF 2.8
He Jiahao,Zhang Guoxin,Xiao Yiyao,Wang Chao,Song Ningning
An effective strategy for improving microwave absorbing performance was proposed in atomically dispersed bimetallic carbon-based composite materials. The atomically dispersed ZnCo-NC@rGO composites were synthesized though metal-mediated formamide (FA) condensation and carbonization. By adjusting the Co/Zn sites loading, the electromagnetic parameters and absorption performance could be effectively optimized. With the Co/Zn ratio of around 0.01, the minimum reflection loss (RL min ) reached − 26.63 dB at absorbing thickness of 1.50 mm, and the maximum effective absorption bandwidth (EAB, RL < − 10 dB) was up to 4.52 GHz (12.78–17.30 GHz) at absorbing thickness of 1.60 mm, covering almost the Ku band. A stronger RL min of − 59.63 dB was obtained with a thickness of 4.70 mm. Different loading of atomically dispersed metal sites induces variations in metal center and ligand structure. This endows ZnCo-NC@rGO excellent impedance matching and synergistic electromagnetic loss effects. In addition, the maximum radar cross section (RCS) reduction value was up to 26.94 dB m 2 at a scattering angle of 0°. This study points out a feasible path for the fabrication of carbon-based ultralight synergistic absorbers.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 2
·1-10
·
IF 2.6
Liu Chengchao,Sui Kun,Liu Jiuhong,Wang Zhongwei,Chen Long,Yu Qing
Scutellaria baicalensis (SBC) richly possess active ingredients to satisfy the conditions for functional applications. Herein, the active components of SBC are extracted and introduced into linear low-density polyethylene (LLDPE) to perform as functional additives. The thermal oxygen stability, processing stability, ultraviolet (UV) stability, flame retardancy and mechanical properties are comprehensively investigated. Compared with pure LLDPE, the oxidation induction time (OIT) of LLDPE incorporating SBC extractive (SBE) increased ca. 24 times. The combination of SBE and antioxidant 626 produce more superior antioxidant capacity (OIT of 99.7 min is achieved), revealing an outstanding synergistic effect. After UV irradiation, the carbonyl index variation of the LLDPE adding SBE is less than 50% of that of pure LLDPE. The TGA test showed that SBE was involved in the free radical elimination process. Moreover, the horizontal burning time increases by 37 s with the introduction of both SBE and antioxidant 626. Those results adequately manifest that SBE is a natural, high-performance multi-function additive for LLDPE. This study validly expands the multi-functional application of natural substances into polyolefins, which is a great benefit to the green development of polymer-based composites.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2023
·Vol. 25
·期 8
·1-11
·
IF 2.5
Dong Qi Zheng,Huang Xin Yi,Huang Cheng
A composite luminescent material consisting of perovskite quantum dots (PQDs) and MOF-5 using an in-situ growth method. The preparation of MOF-5 as a growth template was achieved via hydrothermal synthesis, with the addition of CTAB/TMB as a stencil agent to facilitate the formation of pores with an appropriate size. Subsequently, CsPbBr 3 QDs were grown in situ on the MOF under mechanical grinding conditions. The prepared CsPbBr 3 @MOF-5 composite materials were characterized by various analytical techniques including BET, XRD, PL, TEM, SEM, and EDS. The results revealed that the average size of PQDs was only 4.9 nm, and the corresponding emission peak exhibited a blue shift of 11 nm. The photoluminescence intensity (PL) of CsPbBr 3 @MOF-5 was increased by 71% compared to the unmodified sample, and photoluminescence quantum yield (PLQY) of solid powder increased to 48%. This is due to the fact that MOF-5 reduces the surface defects of quantum dots. Additionally, the Significantly improved PQDs stability after compounding MOF, both at room temperature and under thermal stress. These findings highlight the potential of this synthetic strategy as a means of preparing ultra-small composite light-emitting materials, with promising applications in LED and optoelectronic devices.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 4
·1731-1737
·
IF 2.2
Chen Minshu,Li Yuanxun,Li Fuyu
Here, Ca 5 Mn 4− x Ni x V 6 O 24 (CMNVO, x = 0.00–0.08) ceramics are successfully prepared by the solid-phase reaction method, and the connection between the physical phase information, microscopic morphology, Raman spectroscopy, and microwave dielectric properties is explored. The experimental results show that Ni 2+ occupies the Mn 2+ sites without altering the crystal structure and is effectively solid-solvated into the lattice. The relative density reaches a maximum value of 95.9% when the temperature (Tem.) = 900°C and x = 0.06. The trend of the dielectric constant ( ε r ) depends on the ionic polarization rate, and the quality factor ( Q×f values) are correlated with the microstructure and relative density. The maximum value of 43,800 GHz is reached at Tem. = 900°C and x = 0.06, and the temperature coefficient of resonant frequency ( τ f values) is enhanced from −75 ppm/°C to −52 ppm/°C. The CMNVO ( x = 0.06) ceramic obtains better microwave dielectric properties ( ε r = 11.4, Q×f = 43,800 GHz, and τ f = −52 ppm/°C). This ceramic material is expected to be a candidate for low-temperature co-fired ceramic (LTCC) microwave devices.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 10
·1-13
·
IF 2.8
Wang Yuan,Chen Liang,Jiang Pingping,Zhang Pingbo,Bao Yanmin,Gao Xuewen,Xia Jialiang
In this study, 2,6-diacetylpyridine dioxime was synthesized from 2,6-diacetylpyridine and hydroxylamine hydrochloride as raw materials and bonded into the molecular chain of waterborne polyurethane as an alcohol chain extender, Subsequent addition of Cu 2+ interacted with the Schiff base structure in the WPU molecular chain to generate room-temperature self-healing polymeric materials with multiple dynamic bonds based on ligand bonds, oxime carbamates, and hydrogen bonds. Due to the synergistic effect of multiple dynamic bonds, DWPU-Cu 0.25 exhibited excellent mechanical properties (tensile strength of 11.9 MPa and elongation at break of 1620%) and excellent room temperature self-healing ability (healing efficiencies of 89.1% and 95.8% for elongation at break and tensile strength, after 72 h of room temperature healing). Additionally, antibacterial experiments showed that DWPU-Cu films can release copper ions and create antibacterial zones around polyurethane films, demonstrating their use in the field of antibacterial coatings. By introducing covalent bonds and non-covalent dynamic bonds into the waterborne polyurethane to improve the healing ability of the material, and this internal self-healing method avoids the disadvantages of the external self-healing method, such as irreversibility, complex operation and poor compatibility. This self-healing mechanism based on the dynamic bond inside the material can not only realize repeated self-healing, but also have excellent basic properties, and can also expand other functions on the basis of self-repair, and realize the application of multifunctional materials.
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高影响因子
JOURNAL OF FLUORESCENCE
·
2024
·
IF 2.6
Wang Daifang,Shen Ligong,Liu Wenjun,Cao Xiao,Wang Qianwen
This article introduces a novel unlabeled surface-enhanced electrochemiluminescence (SEECL) sensor for malachite green (MG) detection. The SEECL sensor was prepared by modifying the Ru(bpy) 3 2+ doped gold-SiO 2 core–shell nanocomposites (Au@SiO 2 -Ru(bpy) 3 2+ ) on the gold electrode. Ru(bpy) 3 2+ of nanocomposites can not only emit electrochemiluminescence (ECL) with electrochemical reaction, but also induce the local surface plasmon resonance (LSPR) of gold core. That is beneficial to enhance the ECL signa of sensor. However, in the existence of MG, the luminescence of sensor would be quenched by the fluorescence resonance energy transfer (FRET) between MG and Ru(bpy) 3 2+ . In this paper, both fluorescence and ECL of the Au@SiO 2 -Ru(bpy) 3 2+ were investigated for MG detection. And the results show that the SEECL sensor has high sensitive to MG. Under the optimal experimental conditions, the minimum detection concentration could be achieved about 1.0 nM of MG, which fully meets the China national standard detection requirements of veterinary drug residue in seafood.
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PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2024
·Vol. 109
·期 3
·835-848
·
IF 2.3
Wang Lipeng,Liu Kun,Yin Meilin,Yin Bo,Liu Xingping,Tang Shaokun
Anti-reflection film (AR), as a type of optical coating, is applied to surfaces such as lenses, optical elements, and displays to minimize glare and allow more light to enter the eyes. In this study, we propose a novel method to prepare an anti-reflection superhydrophobic silica coating. The original film is made from a fluorine-containing solution and is subsequently modified through gas-phase chemical vapor deposition in a hexamethyldisilazane environment. This modification process reduces the consumption of fluorosilane and improves the transmittance of the coating. The prepared AR film in our work exhibits excellent optical performance with a maximum transmittance of 98.2% across a broad wavelength range of 300–900 nm. Compared to the average transmittance of bare glass at 89.1%, the maximum average transmittance can reach 95.2%. By controlling the amount of ammonia, the refractive index can be adjusted to a low level in the range of 1.08–1.16. Moreover, the superhydrophobic film was treated with wet ammonia to further bolster its mechanical properties. Since the excellent superhydrophobic properties of the prepared AR film, it can repel the dirt adhering to the edge of the film, thus obtaining excellent self-cleaning ability. In addition, the film can recover superhydrophobicity after cleaning with pure alcohol. This work contributes to further promoting the widespread application of AR film. Graphical
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2018
·Vol. 36
·期 10
·1150-1156
·
IF 2.016
Qiu Wei-Guang,Zhang Fei-Long,Jiang Xu-Bao,Kong Xiang-Zheng
Polyureas (PU) are well known as a class of high impact engineering materials, and widely used also in emerging advanced applications. As a general observation, most of them are only soluble in a very limited number of highly protonic solvents, which makes their chemical structure analysis a great challenge. Besides the presence of abundant hydrogen bonding, the poor solubility of PU in common organic solvents is often ascribed to the formation of biuret crosslinking in their molecular chains. To clarify the presence of biuret groups in PU has been of great interest. To this end, two samples, based on hexamethylene diisocyanate (HDI) and toluene diisocyanate (TDI) respectively, were synthesized by precipitation polymerization of each of these diisocyanates in water-acetone at 30 °C. Their chemical structures were analyzed by high resolution magic angle spinning (HR-MAS) NMR, and through comparison of their NMR spectra with those of specially prepared biuret-containing polyurea oligomers, it was concluded that biuret group was absent in all the PU prepared at 30 °C. In addition, this NMR analysis was also applied to a PU obtained by copolymerization of TDI with ethylene diamine (EDA) and water at 65 °C in EDA aqueous solution. It was confirmed that biuret unit was also absent in this PU and that EDA was more active than water towards TDI. The presence of EDA was crucial to the formation of uniform PU microspheres. This study provides therefore a reliable method for the analysis of PU chemical structure.
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高影响因子
危险品化学品经营许可证（带存储）