INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
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2022
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IF 3.848
Yi Li,Yasai Bai,Hui Chen,Jicai Liang,Kaifeng Yu,Ce Liang
To obtain a heat-resistant and flame-retardant epoxy film system that can be stored for a long time, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) was used to modify an imidazole curing agent , and thus a new reactive flame retardant curing agent (DMH) was successfully synthesized. A phenolic epoxy resin matrix with an oxazolidinone (EPO) structure was synthesized through the reaction of a phenolic epoxy resin (EPN) and toluene diisocyanate (TDI), and polyethersulfone (PES) was used as a toughening agent. After characterization of the material, the curing process was also considered. The results showed that the film adhesive maintained reaction inertness around room temperature and was effectively cured at a curing temperature of 130 °C and released moderate heat. Cone calorimetry testing further confirmed the excellent flame retardance of the film adhesive. The T5% temperature obtained from thermogravimetric analysis (TGA) was as high as 366 °C, which proved its good thermal stability . On this basis, the mechanical properties of the film adhesive didn't decrease, and the addition of PES ensured its good toughness. When used as the adhesive for cured resin aluminum-honeycomb sandwich samples, the lap shear strength (LSS) of the sample reached 35.6 MPa. Due to these advancements, the film adhesive system has the potential for application in a wide range of fields.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Zhen-Dong Lian,Bo Wang,Zhi-Sheng Wu,Hao Lin,Shan-Shan Yan,Jie-Lei Li,Kang Zhang,Qing-Guang Zeng,Jin-Cheng Xu,Shi Chen,Shuang-Peng Wang,Kar Wei Ng
CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) have shown great potential in numerous applications including wide color gamut display and lighting. Despite the wonderful luminescence properties, the inherent instability of these NCs hinders their use in practical situations. Herein, we report a facile aqueous-based, ligand-free method to synthesize highly stable CsPbX3 NCs using ZIF-62, a metal–organic framework, as an encapsulation matrix which effectively isolates CsPbX3 from the surrounding. We discovered that the slightly alkaline nature of ZIF-62 facilitates the reaction between water and PbBr2 to form PbBr(OH), which not only passivates the surface defects of the CsPbBr3 NCs but also prevents the perovskite from decomposing or oxidizing at high temperature. Sintering of ZIF-62 can therefore be performed in air at ∼300 °C to completely seal the perovskite within the insulating matrix, resulting in CsPbBr3/ZIF-62 composites exhibiting high stability against polar solvents, heat, light, and ambient humidity. Notably, the composite can maintain its bright luminescence without noticeable degradation in water for more than 2 months. The narrow-band emission and stability of these composites led to the demonstration of white light-emitting diodes with excellent color stability. Without the need for organic solvents during NC synthesis and noble gas ambient during sintering, the strategy proposed here can potentially facilitate the cost-effective, large-scale synthesis of highly stable perovskites which show great promise in commercial applications.
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高影响因子
COMPOSITES PART B-ENGINEERING
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2023
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IF 13.1
Jingsheng Wang,Jun Wang,Shuang Yang,Kaiwen Chen
To simplify the manufacture and address the intrinsic flammability of epoxy resin (EP) products, the single-component, fire-safe EP systems are increasingly in demand. However, current design strategy is difficult to achieve the simultaneous improvement in storage stability, flame retardancy and smoke suppression. Herein, a phosphorus/imidazole-containing, aluminum-based complex (ADIM) was synthesized, and applied as a latent curing agent for EP. The shelf life of EP/ADIM system reached 30 days, and its gel time at 150 °C was only 42 min, indicative of great thermal latency and fast curing rate. EP/ADIM thermoset showed superior flame retardancy, as confirmed by a limiting oxygen index (LOI) of 35.0% and a UL-94 V-0 classification. In addition, the total smoke production and maximum smoke density of EP/ADIM thermoset were 38.7% and 22.3% lower than those of EP thermoset cured by imidazole (EP/IM), demonstrating obviously-enhanced smoke suppression. ADIM inhibited the heat release and smoke generation of the EP matrix via radical capturing and catalytic charring. Moreover, EP/ADIM thermoset exhibited comparable thermal resistance and mechanical properties to EP/IM thermoset. Hence, this work offers an integrated design strategy for creating high-performance, fire-safe, single-component EP with well-preserved mechanical and thermal properties.
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MOLECULES
·
2023
·Vol. 28
·期 2
·702
·
IF 4.6
Zhiyang Feng,Jiaqing Zhu,Shen Zhuo,Jun Chen,Wenyi Huang,Hao Cheng,Lijun Li,Tai Tang,Jun Feng
A magnetically functionalized Fe3O4@ZIF−67 metal–organic framework (MOF) was prepared by electrostatic self-assembly using magnetic Fe3O4nanoparticles as the core and ZIF−67 as the shell. The composite was characterized by electron microscopy, X-ray diffraction, Fourier- transform infrared spectroscopy, and Brunauer–Emmett–Teller measurements. Magnetic solid-phase extraction (MSPE) was performed on five flavonoids fromDicranopteris pedatausing Fe3O4@ZIF−67 as an adsorbent. The developed MSPE method was combined with high-performance liquid chromatography–ultraviolet detection to preconcentrate and separate five flavonoids (rutin, quercitrin, kaempferol-3-O-α-L-rhamnoside, quercetin, and kaempferol) fromDicranopteris pedata. The factors affecting the extraction, such as the amount of Fe3O4@ZIF−67 adsorbent, salt ion concentration in the sample solution, vortex time, type and amount of desorbing solvent, concentration of formic acid to acidify the desorbing solvent, and acetonitrile ratio, were optimized. The developed method showed good linearity over the concentration range of 1.09–70.0 μg∙mL−1for the five flavonoids, with R2values between 0.9901 and 0.9945. The limits of detection and average recoveries for the five flavonoids were in the ranges of 39.5–56.2 ng∙mL−1and 92.2–100.7%, respectively. The method presented herein is simple, efficient, and sensitive; it can be used for enrichment analysis of the five flavonoids inDicranopteris pedata.Keywords:magnetic solid-phase extraction;Fe3O4@ZIF−67;Dicranopteris pedata;flavonoids;metal–organic framework materials
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2023
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IF 4.2
Yue Li,Shaojuan Zeng,Shuang Zheng,TongTong Zhao,Xueqi Sun,Lu Bai,Chun Deng,Xiangping Zhang
Ionic liquids (ILs), as promising candidates for ammonia (NH3) separation and recovery, have attracted extensive attention due to their extremely low pressures, high gas affinity, and adjustable structures. However, the development of new absorbents or adsorbents for highly efficient, fast, and reversible separation is still a great challenge. In this work, multiproton ILs (MPILs) by simultaneously introducing two or more −H, −OH, or −SO3H sites into the cations were designed to enhance NH3 uptake, and the MPIL N,N,N′,N′-tetrakis (2-hydroxyethyl)ethylenediamine trifluoromethane sulfonate ([EdteH6][TfO]2) with four −OH and two −H sites exhibited a superhigh capacity of 5.08 mol NH3·(mol IL)−1 at 40 °C and 1 bar. To solve the slow gas–liquid mass transfer due to the high viscosity of MPILs, the designed MPILs were highly dispersed onto the molecular sieve HZSM-5 with abundant pore structures to prepare a series of porous MPIL-based hybrid adsorbents for NH3 adsorption. The highest capacity of 140.42 mg NH3·(g adsorbent)−1 at 30 °C and 1 bar was achieved by 60 wt % [EdteH6][TfO]2@HZSM-5-60 (HZ60) due to multiple hydrogen bonding and mesopore effects, which is superior to all of the nonmetal IL-based adsorbents reported to date. Meanwhile, the 60 wt % [EdteH6][TfO]2@HZ60 also exhibited high NH3/CO2 and NH3/N2 selectivities, which are almost 16 and 14 times greater than that of pure HZ60, respectively, along with excellent reversibility. This work provides a feasible way to design novel porous IL-based adsorbents for gas separation and recovery.
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高影响因子
BIORESOURCE TECHNOLOGY
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2022
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IF 11.889
Cong-Jia Duan,Xu Han,Yuan-Hang Chang,Jian Xu,Gan-Lu Yue,Ying Zhang,Yu-Jie Fu
A novel ternary deep eutectic solvent (DES), consisted of choline chloride, oxalic acid and ethylene glycol, was developed as a green, low-cost and recyclable pretreatment system for multi-stage utilization of Eucommia ulmoides seed shells. Under optimum conditions, 79.7 % hemicellulose and 65.6 % lignin were quickly removed while 84.0 % cellulose was retained. After DES pretreatment , the yield and purity of gutta-percha achieved 85.1 mg/g and 96.2 %, which increased 1.4 and 1.8 folds higher than that of un-treatment ones. Meanwhile, 69.1 % enzymatic digestibility of cellulose was obtained, that was 2.3 folds higher than that of raw substrates. Moreover, 53.6 % low-condensation lignin with aromatic structures and valuable aryl-ether linkages was well collected. Importantly, the DES that has been recycled five runs can still remove 73.9 % hemicellulose and 58.0 % lignin. Overall, the DES was determined to efficiently promote the separation and conversion of high-quality gutta-percha, value-added lignin and high-yield glucose from Eucommia ulmoides seed shells.
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高影响因子
OPTIK
·
2022
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IF 2.84
Ruoxian Hou,Hanzhang Chen,Defu Sun,Nana Zhang,Chuanying Shen,Duanliang Wang
Using the solvent evaporation approach at room temperature (RT), we produced transparent single crystals of two new organic-inorganic hybrid materials: (C 5 H 6 NO)SO 3 NH 2 (crystal 1: reaction by sulfamate and 4-hydroxypyridine) and (C 3 H 5 N 2 )SO 3 NH 2 (crystal 2: reaction by sulfamate and imidazole). Both crystals have the same space structure and belong to the P 2 1 / c space group of the monoclinic crystal system, according to the results of X-ray single crystal diffraction. In crystals 1 and 2, sulfamic acid and organics (4-hydroxypyridine, imidazole) are alternatively positioned by hydrogen bonds to create a layered structure. Hydrogen bonds and electrostatic Coulomb forces connect the layers to one another. Powder XRD demonstrates the remarkable phase purity of both crystals. Furthermore, the optical properties of both crystals, including IR , UV absorption, and fluorescence spectra , have been investigated in detail. The presence of functional groups such as NH 2 and C C in the grown crystals was confirmed by Fourier transform infrared analysis. The optical band gaps for crystals 1 and 2 are about 4.33 and 4.31 eV, respectively, and the UV absorption findings show a low light absorption . According to the photoluminescence spectra, the two crystals have distinct fluorescence characteristics, with emission peaks of approximately 433 nm and 442 nm, apiece.
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高影响因子
Separations
·
2022
·Vol. 9
·期 12
·441
·
IF 3.344
Xiaoman Li,Ruobing Qiao,Xuyang Jiu,Minglei Tian
(+)-catechin is one category of flavonoids in cocoa shell waste and it has been reported to have many health benefits. In order to isolate it from aqueous extracted solution of cocoa shell waste by solid phase extraction (SPE), a series of dual ionic liquids@ZIF8-covered silica were prepared as the sorbents. Regarding the operation conditions of SPE and the characteristic structure of (+)-catechin, ZIF8-covered silica was synthesized to establish a stable and porous substrate, and various dual ionic liquids with multiple properties were immobilized on substrate to obtain a high adsorption capacity. Different adsorption conditions were investigated and the highest adsorption capacity (58.0 mg/g) was obtained on Sil@ZIF8@EIM-EIM at 30 °C during 60.0 min. When the sorbent was applied in the SPE process, 96.0% of the total amount of (+)-catechin from cocoa shell waste can be isolated after several washing and elution steps. The satisfactory recoveries of 97.5–100.2% and RSDs of 1.3–3.2% revealed that the SPE process was accurate and precise. The stability of Sil@ZIF8@EIM-EIM was tested in water and the reusability was tested using repeated adsorption/desorption process. The results revealed that Sil@ZIF8@EIM-EIM as an efficient sorbent can isolate (+)-catechin from cocoa shell waste.Keywords:dual ionic liquid;ZIF8;composited silica;solid phase extraction;(+)-catechin;cocoa shell waste
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiujuan Qiao,Xing-Xing Gou,Yang Li,Jian-Li Li,Tianli Yue,Qinglin Sheng,Ying-Feng Han
Gold nanoparticles (Au NPs) are often susceptible to environmental changes, especially a complexly biological environment, significantly hindering the potential application of biosensors for practical detection. However, the controllable construction of ultrastable water-soluble Au NPs for biosensing applications remains a major challenge today. Here, ultrastable water-soluble Au NPs protected by tris-N-heterocyclic carbene (NHC) ligands (2·Au NPs) have been controllably designed and synthesized. The tris-NHC shell on the Au NP surface increases the chemical and electrochemical stability of the materials, making them stable in biological environments and even in excess biomercaptan. In addition, the ammonium salt substituent on the imidazolium nitrogen not only regulates the water solubility of Au NPs but also facilitates electrostatic interactions with biological substances. Ultimately, based on the controlled synthesis of ultrastable 2·Au NPs, it is convenient to build a probe for toxic substances of ochratoxin A detection with two signal readouts. A low limit of detection (0.66 pmol·L–1) and a wide linear response range (2.5 pmol·L–1 to 25 μmol·L–1) are achieved. Meanwhile, this proposed aptasensor exhibits excellent selectivity toward various potential interfering bioanalytes and sundry ions. This work demonstrates an efficient method to regulate the properties of Au NPs by functional NHC anchors and paves the way for practical biosensing application purposes.
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CARBOHYDRATE POLYMERS
·
2023
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IF 11.2
Yongsheng Ma,Shuyi Xu,Pengpeng Yue,Hankun Cao,Yongkang Zou,Lizhe Wang,Haitao Long,Shuangquan Wu,Qifa Ye
Infections caused by bacteria have long constituted a major threat to human health and the economy. Therefore, there is an urgent need to design broad-spectrum antibacterial materials possessing good biocompatibility to treat such infections. Herein, inspired by the good biocompatibility of chitin and antibacterial properties of imidazolium salts, a polysaccharide-based material, imidazolium salt chitin (IMSC), was homogeneously prepared using a facile method with epichlorohydrin as a chemical crosslinker to combine chitin with imidazole to enhance Staphylococcus aureus ( S. aureus )-infected wound healing. The characteristics, antimicrobial properties, and biosafety of IMSC were evaluated. The results demonstrated successful grafting of imidazole onto chitin. Furthermore, IMSC exhibited good water solubility, broad-spectrum antimicrobial activity, hemocompatibility, and biocompatibility. Moreover, IMSC enabled complete healing of S. aureus -infected wound in Sprague–Dawley rats within 15 days of application, thus demonstrating that IMSC could reduce wound inflammation and remarkably accelerate wound healing owing to its efficient antibacterial activity and ability to promote collagen deposition in and around the wound area. Therefore, this study provides a promising and potential therapeutic strategy for infected wound healing by synthesizing a water-soluble and broad-spectrum antimicrobial material exhibiting good biocompatibility.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2022
·
IF 4.601
Lizhen Qiao,Yuan Tao,Honglin Qin,Ruiting Niu
In this paper, several new multi-magnetic center magnetic ionic liquids (MMILs) were prepared with paramagnetic component simultaneously contained in both the cation and anion and used as extractants to establish a dispersive liquid-liquid microextraction (DLLME) approach followed by in-situ MMIL decomposition based back-extraction for the enrichment and determination of four parabens in beverages. The appropriate MMIL was selected by investigating the extraction performances of the obtained MMILs combined with high performance liquid chromatography-ultraviolet detection (HPLC-UV), and some other experimental factors were explored. Under the optimized DLLME conditions, the four parabens exhibited coefficients of determination (R 2 ) above 0.9987 in the linear range of 0.1-500 ng·mL −1 for ethylparaben, propylparaben and butylparaben and 0.2-500 ng·mL −1 for methylparaben. The limits of detection (LODs) and limits of quantification (LOQs) were respectively within 0.03-0.06 ng·mL −1 and 0.1-0.2 ng·mL −1 , and the relative standard deviations (RSDs) for intra-day and inter-day precision were below 10.8%. Moreover, the application of the developed MMIL-based DLLME method in beverage samples exhibited recoveries within 81.3%-112.1% with RSDs of 0.3%-13.1% at three different spiked levels.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Changqing Guo,Guanghui Chen,Ning Wang,Shougui Wang,Yuwen Gao,Jipeng Dong,Qing Lu,Fei Gao
Several novel multifunctional histidine-based hypercrosslinked ionic polymers (HIPs) were constructed via a one-pot copolymerization strategy. The resultant HIPs were characterized by various technologies and investigated for the CO 2 adsorption and conversion. Plentiful hydrogen bond donors, nucleophilic ionic sites, and Lewis bases were successfully integrated into the HIPs skeletons. As-prepared histidine-based HIPs possess excellent hierarchical pore structure. The optimal HIP-Br-His exhibits a high CO 2 capture capacity of 2.90 mmol/g at 273 K and 1 bar, much higher than that of corresponding hypercrosslinked polymer HCP-Br without histidine units. Meanwhile, the HIP-Br-His achieves an excellent catalytic activity of 95 % product yield with 99 % product selectivity in CO 2 cycloaddition to propylene oxide under metal-, cocatalyst- and solvent-free and mild conditions (70 °C and 1.0 MPa). Particularly, HIP-Br-His can efficiently capture and convert dilute CO 2 into cyclic carbonates with a satisfactory catalytic performance. The excellent catalytic activity associating with the confirmed good stability, recyclability, and substrate compatibility make the developed histidine-based HIPs a promising heterogeneous catalyst for efficient CO 2 capture and conversion.
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危险品化学品经营许可证（带存储）