Frontiers in Chemistry
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2023
·
IF 5.5
Zhang Jie,Ren Quan,Wang Yun,Xiao Ruixue,Chen Hongyu,Xu Wenjia,Feng Yuhua
Hybrid nanostructures have garnered considerable interest because of their fascinating properties owing to the hybridization of materials and their structural varieties. In this study, we report the synthesis of [Au@Rh(OH)3]-Au island heterostructures using a seed-mediated sequential growth method. Through the thiol ligand-mediated interfacial energy, Au@Rh(OH)3 core-shell structures with varying shell thicknesses were successfully obtained. On these Au@Rh(OH)3 core-shell seeds, by modulating the diffusion of HAuCl4 in the porous Rh(OH)3 shell, site-specific growth of Au islands on the inner Au core or on the surface of the outer Rh(OH)3 shell was successfully achieved. Consequently, two types of distinct structures, the Au island-on-[Au@Rh(OH)3] dimer and Au island-Au bridge-[Au@Rh(OH)3] dumbbell structures with thin necks were obtained. Further modulations of the growth kinetics led to the formation of Au plate-Au bridge-[Au@Rh(OH)3] heterostructures with larger structural anisotropy. The flexible structural variations were demonstrated to be an effective means of modulating the plasmonic properties; the Au–Au heterostructures exhibited tunable localized surface plasmon resonance in the visible-near-infrared spectral region and can be used as surface-enhanced Raman scattering (SERS) substrates capable of emitting strong SERS signals. This diffusion-controlled growth of Au bridges in the Rh(OH)3 shells (penetrating growth) is an interesting new approach for structural control, which enriches the tool box for colloidal nanosynthesis. This advancement in structural control is expected to create new approaches for colloidal synthesis of sophisticated nanomaterials, and eventually enable their extensive applications in various fields.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2023
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IF 4.3
Chunhui Yi,Fanyong Yan,Xin Wei,Yawei Wu,Xueyu Wang,Jinxia Xu
Based on the fluorescence resonance energy transfer (FRET) principle, a yellow-green light fluorescent probe was designed and synthesized for the detection of neutral red using fluorescein monoaldehyde-3-acetylcoumarin as the fluorophore. The fluorescein moiety in the probe structure is readily interchangeable and heterogeneous in the form of an anion, and the neutral red is a quaternary ammonium salt structure with N. Therefore, the two are bound together in the form of ionic bonds through the mutual attraction of anions and cations. At the same time, FRET occurs, resulting in the absorption of the fluorescence emitted by the probe by the neutral red molecule, leading to a significant quenching of its fluorescence. The probe has a high selectivity for neutral red with a linear range of 0–30 μM and a detection limit of 8. 68 μM. Furthermore, the fluorescent probe has been successfully applied to the detection of neutral red content in real water samples with a recovery of 101 %-115 %. The probe has promising potential in the quantitative detection of neutral red.
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JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 2
·1-15
·
IF 2.8
Qin Y. X.,Wang C.,Li K. Y.,Jin B. R.,Chen Y. R.,Ren L.,Zhang M. Y.,Zhang H. X.
Considering the current research background of environmental problems and shortages of petroleum resources aiming at proposing the “green” polymer blend with good degradability and properties similar to oil-based merchandise currently on the market, in the present study, two series of fully biodegradable blends consisting of PBS/P34HB (PBP) and PBS-g-GMA/P34HB (PGP) have been successfully fabricated by a simple and environmental-friendly processing methodology. In this work, the resulting biodegradable blends are in detail studied from the mechanical, thermal, crystallization, and morphology points of view. To improve the miscibility and enhance the interfacial adhesion between both phases of poly(butylene succinate) (PBS) as the matrix and poly (3-hydroxybutyrate-co-4-hydroxybutyrate) (P34HB) as the modifier, with consequent improvement in material mechanical properties, glycidyl methacrylate (GMA) is grafted on PBS via reactive blending in the process. The incorporation of 10wt% P34HB into the blend promotes a dramatic increase of 614% in the Izod impact strength. The crystallization temperature (Tc) of PGP is 87.78℃ when 30wt% P34HB is added, which is 25% higher than that of pure PBS and 11% higher than that of the PBP blend. Meanwhile, the crystallinity of PGP is 30.12%, 47%, and 37% decline compared to pure PBS and PBP, respectively. Rheological results show that storage modulus, loss modulus, and complex viscosity improve significantly with the increase of P34HB amount, indicating that the enhancement of melt strength is beneficial to the processing and forming of the materials.
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LANGMUIR
·
2022
·
IF 4.331
Fiona Hammond Quarcoo,Lijian Shi,Yujia Tong,Yaping Zhang,Changqing Miao,Weixing Li
Plant polyphenol-inspired surface modification of membranes is helpful for oil–water separation. However, the preparation of this coating is time-consuming. Herein, we introduce a rapid synthesis of the TA-APTES coating by the addition of sodium periodate (SP). The surface chemical composition and morphology of the resultant TA-APTES hybrid coatings were characterized using SEM, ATR-FTIR, and XPS. The hydrophilicity and membrane performance were investigated by the water contact angle, pure water permeability, and oil rejection for an isooctane-in-water emulsion. The experimental findings revealed that the optimal microfiltration (MF) membrane (MF-TA-APTES-SP-0.05) displayed exceptional hydrophilicity and water permeability (9558 L m–2 h–1 bar–1). The membrane realized highly efficient separation with a permeability (4117 L m–2 h–1 bar–1) and rejection of oils (>99%). Furthermore, it possessed outstanding chemical stability and maintained underwater superoleophobicity even after exposure to harsh conditions. This simple and rapid strategy of developing hydrophilic coatings as a modifier for the poly(vinylidene fluoride) membranes has potential applications in oil–water separation and wastewater treatment.
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Polymers
·
2023
·Vol. 15
·期 4
·810
·
IF 5
Zeping Wang,Binjie Hu,Haibin Yu,George Zheng Chen
In this study, three copolymers of poly(methyl methacrylate) and poly(butyl acrylate) (PMMA-co-PBA) latex containing 1-octyl-3 methylimidazolium hexafluorophosphate (C8mimPF6), cellulose nanocrystals (CNCs), and C8mimPF6-CNCs were successfully synthesized through mini emulsion polymerization. These novel composites were each coated on mild steel panels and tested for their anti-corrosion performance by immersion of the coated samples in 3.5 wt% sodium chloride (NaCl) solution over a certain period. The synergistic anti-corrosion effects of the C8mimPF6-CNCs sample led to the highest coating resistance, charge transfer resistance, and corrosion inhibition efficiency and the lowest diffusion coefficient and corrosion rate. The proposed synergistic mechanism revealed that CNCs enhanced the barrier effect of the coating while C8mimPF6inhibited corrosion when released.Keywords:ionic liquid;cellulose nanocrystals;corrosion protection;polymer;electrochemical analysis;composite
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2023
·
IF 6.1
Dingkai Wang,Mingyu Cui,Yanjun Li,Wei Zhao,Shangshang Ma,Zhijie Jiang,Xutang Liu,Chong Liang,Rujuan Li,Long Ma,Yanmin Song,Xian-Yong Wei
The facile, green, and efficient strategy for the separation of lignin from straw and subsequent production of value-added chemicals is crucial to the current utilization of straw. Herein, up to 23.72% of lignin was isolated from wheat stalk over cheap and green 1-(3-sulfobutyl) triethylammonium hydrogen sulfate ([BSTEA]HSO4) in aqueous ethanol (Vethanol: Vwater = 4:1). The acquired lignin was verified as a p-hydroxyphenyl-guaiacyl-syringyl type, which had a narrower molecular weight distribution, better thermal stability, and higher purity compared with those of the lignin obtained using 1-methyl-3-(4-sulfobutyl)-imidazolium hydrogen sulfate and 1-(3-sulfobutyl) pyridinium hydrogen sulfate. Moreover, a carbohydrate-rich liquid containing [BSTEA]HSO4 was obtained by water removal from the waste liquid after lignin separation and further converted to ethyl levulinate (EL) by a one-pot process in the presence of inexpensive and stable USY zeolite. The yield of EL reached 30.23% at 200 °C for 60 min over the presence of 40% [BSTEA]HSO4 and 60% USY zeolite. Under optimal conditions, the yields of lignin and EL can respectively reach 83.89 and 72.28% of those catalyzed by a fresh catalyst after five cycles. In short, the above-mentioned methods present a green, economic, and efficient route for the extraction of lignin and further treatment of the liquid waste generated during the extraction process.
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ACS Omega
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2022
·
IF 4.132
Huan Song,Bing Li,Xuezhi Gao,Fenglin Shan,Xiaoxia Ma,Xiaoyan Tian,Xiaoyan Chen
For energetic materials (EMs), the key point of the present research is to improve the energetic property and reduce sensitivity. In this work, two new energetic complexes, Mn(atzc)2(H2O)2·2H2O (1) and Zn(atzc)2(H2O) (2) (Hatzc = 3-amino-1,2,4-triazole-5-carboxylic acid), were synthesized by solvent evaporation and diffusion methods, respectively. The structural analyses illustrate that 1 and 2 exhibit zero-dimensional structural units, which are linked by hydrogen-bonding interactions to give three-dimensional supramolecular architectures. For complexes 1 and 2, the detonation velocities (D) are 10.4 and 10.2 km·s–1 and detonation pressures (P) are 48.7 and 48.6 GPa, respectively. They are higher than most of the reported EMs, which present prominent detonation characteristics. In addition, two complexes can accelerate the thermal decomposition of ammonium perchlorate and exhibit excellent catalytic activity. Therefore, the two complexes can serve as a new class of promising EMs, which have potential application in the design of new high-efficiency solid catalysts.
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ELECTROCHIMICA ACTA
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2022
·
IF 7.336
Wenting Wei,Jiaxuan Li,Huiqin Yao,Hongyun Liu
Herein, by a one-step synthetization method, a viologen derivative diallyl viologen (DAV) was first polymerized with methacryloylglycine (MAG) into P(MAG-DAV) polymer films on the surface of ITO electrodes. DAV component in the P(MAG-DAV) films was used not only as a cross-linker and immobilized in the film phase for repetitive usages, but also demonstrated reversibly electrochromic and luminescent properties. When the electrode voltage was switched between −0.7 and −0.5 V (vs SCE), DAV could transfer from its purple reduction state (DAV •+ ) to colorless oxidation state (DAV 2+ ) through the electrode reactions , accompanied with the fluorescence signal switching between non-fluorescence (DAV •+ ) and green fluorescence (DAV 2+ ) states. The addition of KMnO 4 in the solution could oxidize DAV •+ to its DAV 2+ form in the films to generate electrocatalytic signals and change the optical signals at the same time. Based on various reversible stimulus-responsive behaviors of P(MAG-DAV) film electrodes, a logic system of 3-input/3-output was established using potential, KMnO 4 and ultraviolet excitation light as inputs, and cyclic voltammetry (CV), fluorescence (FL) and UV−vis signals as outputs. Including an encoder and a decoder, a unique resettable and reprogrammable keypad lock was built with 3 different outputs. The system used a single immobilized molecule as the core of computing, and applied only 3 stimuli as inputs to construct an integrated logic computing system with 3 different output signals, which greatly improved the complexity and diversity of the molecular computing system. This might provide a new idea for the subsequent development of multifunctional integrated logic devices.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2022
·
IF 1.193
Kun WANG,Er-Fei DONG,Min FANG,Ting CHEN,Wei-Ju ZHU,Cun LI
A new ratio fluorescence sensor based on mercaptamine capped cadmium telluride quantum dots (Mea-CdTe) and benzocoumarin-3-carboxylic acid (BTA) were constructed. The ratio fluorescence sensor (BTA@Mea-CdTe) was synthesized by amidation reaction between the amino groups on the surface of Mea-CdTe quantum dots and the carboxyl groups of BTA. It is found that Hg 2+ ions react with the amino groups on the surface of the quantum dots in the BTA@Mea-CdTe sensor to quench the fluorescence, but it has no effect on the fluorescence of grafted BTA. The sensor has good selectivity and high sensitivity for Hg 2+ ions detection. The detection linear range is 0.4–1.2 µM, and the detection limit is 0.03 µM. This ratio fluorescence sensor can be used for Hg 2+ visual recognition in water sample detection with obvious color change.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 3
·983-1001
·
IF 3.134
Zhang Dawei,Ren Lu,Liu Ailing,Zhang Yumin,Lv Yang,Gu Qiang
Abstract An efficient synthesis of 1,3,5-trisubstituted-1 H -pyrazoles was developed via cyclocondensation in 78–92% yields starting from α , β -unsaturated aldehydes/ketones with substituted phenylhydrazine using vitamin B 1 as a catalyst, and was characterized by HR-MS, FT-IR, 1 H NMR and 13 C NMR spectroscopy. The reaction has simple operation, metal-free catalysis, acid or base free catalysis. As a green catalyst, vitamin B 1 was found to possess favorable catalytic activity and reusability for the condensation reaction. 1,3,5-trisubstituted-1 H -pyrazole shows from orange-red to cyan in different solvents when the electron withdrawing group is attached to acetophenone (taking compound 5i as an example). Compound 5i as a metal ion fluorescent probe has excellent selectivity for Ag + detection. The crystal structure of the compound 3-(4-chlorophenyl)-1,5-diphenyl-4,5-dihydro-1 H -pyrazole ( 5b ) in the orthorhombic space group Pca 21 was presented and formed racemic crystals. Graphical abstract
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npj Science of Food
·
2022
·Vol. 6
·期 1
·1-8
·
IF 7
Chen Yu-Hong,Zhang Yan-Hong,Chen Gen-Sheng,Yin Jun-Feng,Chen Jian-Xin,Wang Fang,Xu Yong-Quan
Phenolic acids are important taste components in green tea. The aim of this study was to analyze the taste characteristics of phenolic acids and their influence on the bitterness and astringency of green tea by sensory evaluation and chemical determination. The major tea phenolic acids and quercetin-3- O -rutinoside (Que-rut) were significantly positively correlated with the bitterness ( r = 0.757, p < 0.01; r = 0.605, p < 0.05) and astringency ( r = 0.870, p < 0.01; r = 0.576, p < 0.05) of green tea infusion. The phenolic acids have a sour and astringent taste, whereas Que-rut has a mild astringent taste. Phenolic acids and Que-rut can increase the bitterness of epigallocatechin gallate (EGCG). However, these components behaved differently for astringency on EGCG. Gallic acid (GA) enhances the astringency throughout all the concentrations in this study. While it seemed to be double effects of caffeic acid (CA), chlorogenic acid (CGA), and Que-rut on that, i.e., the inhibition at lower concentrations (CA: 0–0.2 mM; CGA: 0–0.2 mM; Que-rut: 0–0.05 mM) but enhancement at higher ones. The phenolic acids and Que-rut interacted synergistically with tea infusion and as their concentration increased, the synergistic enhancement of the bitterness and astringency of tea infusion increased. These findings help provide a theoretical basis for improving the taste of middle and green tea.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2022
·
IF 10.319
Qin Wang,Yao Tong,Meiting Yang,Hangtao Ye,Xiaojuan Liang,Xin Wang,Weidong Xiang
In the current situation of energy shortages, saving energy and reducing consumption are undoubtedly valid methods to relieve the pressure on resources. CsPb X 3 ( X = Cl, Br, and I) perovskites as star inorganic materials have drawn growing attention owing to their unique properties, making them suitable for applications such as light-emitting diodes (LEDs), solar cells, photodetectors, or lasers. This work presents zinc oxide (ZnO) induced self-crystallized CsPb(Br/I) 3 perovskite with a 26% photoluminescence quantum yield (PLQY) prepared by the traditional melt-quenching method. Furthermore, the full width at half maximum (FWHM) (34–44 nm) can be regulated by the ZnO content. In addition, as a downconverter, CsPb(Br/I) 3 perovskite nanocrystals (NCs) realize a bright red backlight that covers ≈ 94% Rec. 2020 standards in the CIE 1931 color space and 126% of National Television System Committee (NTSC). This finding undoubtedly confirms an effective path for fabricating perovskite materials in a green, low-cost, and time-saving way, enriching the knowledge of glass crystallization mechanisms and promoting their applications in wide color gamut backlights.
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危险品化学品经营许可证（带存储）