Nanophotonics
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2017
·Vol. 7
·期 2
·473-478
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IF 4.492
Lihua Ye,Fangjie Li,Changgui Lu,Zhixiang Cheng,Guohua Hu,Yanqing Lu,Yiping Cui
The random laser from sheared dye-doped polymer-dispersed liquid crystal (DDPDLC) is investigated. As the emission intensity weakens, the threshold of random laser from DDPDLC increases from 2.0 mJ/pulse to 4.0 mJ/pulse, and the degree of polarization (DOP) increases from 0.1 to 0.78, obviously when the shear distance increases from 0 mm to 4 mm. As the liquid crystal droplets are gradually oriented in the shear direction caused by alignment direction of polymer chain and anisotropy of droplet shape, the scattering intensity perpendicular to the shear direction gradually decreases and that parallel to the shear direction gradually increases. The anisotropic absorption of the laser dye also plays a certain role as the shear distance is 0 mm. The controllable intensity and polarization degree of random laser have a huge potential for sensing applications.
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JOURNAL OF SEPARATION SCIENCE
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2017
·Vol. 41
·期 7
·1635-1643
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IF 2.557
Dandan Ge,Yi Zhang,Yixiu Dai,Shumin Yang
Deep eutectic solvents are considered as new and green solvents that can be widely used in analytical chemistry such as microextraction. In the present work, a new dl- menthol-based hydrophobic deep eutectic solvent was synthesized and used as extraction solvents in an air-assisted dispersive liquid–liquid microextraction method for preconcentration and extraction of benzophenone-type UV filters from aqueous samples followed by high-performance liquid chromatography with diode array detection. In an experiment, the deep eutectic solvent formed by dl- menthol and decanoic acid was added to an aqueous solution containing the UV filters, and then the mixture was sucked up and injected five times by using a glass syringe, and a cloudy state was achieved. After extraction, the solution was centrifuged and the upper phase was subjected to high-performance liquid chromatography for analysis. Various parameters such as the type and volume of the deep eutectic solvent, number of pulling, and pushing cycles, solution pH and salt concentration were investigated and optimized. Under the optimum conditions, the developed method exhibited low limits of detection and limits of quantitation, good linearity, and precision. Finally, the proposed method was successfully applied to determine the benzophenone-type filters in environmental water samples with relative recoveries of 88.8–105.9%.
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FOOD AND AGRICULTURAL IMMUNOLOGY
·
2018
·
IF 2.568
Fengyin Liu,Zijian Chen,Yudong Shen,Yuanming Sun,Jinyi Yang,Hong Wang,Hongtao Lei,Zhenlin Xu
Immunoassay direct for 3-amino-5-morpholinomethyl-2-oxazolidone (AMOZ), the metabolite of furaltadone, based on a specific antibody was usually unavailable due to its small molecule weight. In this work, a hapten with a double bond and an active carboxyl group was designed and then conjugated to peptide dendrimer to obtain novel multiple haptens. The haptens and multiple haptens were coupled to bovine serum albumin as immunogens. Polyclonal antibodies showed binding to free AMOZ in a heterologous competitive indirect enzyme-linked immunosorbent assay were obtained. The assay showed IC50 (half maximal inhibitory concentration) of 4.1 μg/kg and limit of detection of 0.2 μg/kg for AMOZ. Recoveries of AMOZ from grass carp were tested from 83.1% to 117.0%, with the coefficient of variation below 12%. As no laborious derivatisation procedure was employed, the proposed assay should be useful for the screening of AMOZ for a large number of samples.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Zhengtong Wang,Cong Chen,Kai Lian,Zhihui Deng,Yiwei Zhao,Jiachen Han,Yelin Ding,Chun Sun
White light-emitting diodes (WLEDs) have become essential to various aspects of our daily lives. However, the absence of a strong cyan emission significantly hinders the development of full-spectrum WLEDs that could achieve high-quality applications. Here, a feasible method is introduced to synthesize highly luminescent and stable CsPbBr3 by employing an efficient dual-matrix encapsulation technique. Sodium citrate (SC) is utilized as a matrix to disperse these CsPbBr3 nanomaterials, thereby reducing self-absorption and energy transfer. In addition to functioning as a matrix, SC also passivates the perovskite nanomaterials, resulting in an increased photoluminescence quantum yield (PLQY) and enhanced stability of the perovskite. Notably, the stability of the perovskite, especially its resistance to water, is significantly enhanced after encapsulating the composite within poly(methyl methacrylate) (PMMA). A series of full-spectrum WLEDs with variable color temperatures ranging from 2763 to 7145 K and high color rendering indices (90–96) were fabricated using SC-CsPbBr3@PMMA in combination with commercially available YAG and red phosphors CaAlSiN3:Eu2+. This research opens up new avenues for the utilization of perovskite nanomaterials in the development of next-generation full-visible-spectrum WLED lighting.
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Guangyang Jiang,Kaiwen He,Mingrui Chen,Yichen Yang,Tingting Tang,Yongqiang Tian
To improve the limited mechanical and water barrier properties of chitosan film while granting extra functionalities simultaneously, present study pioneered the incorporation of chitosan film with newly developed essential oil (EO)-based hydrophobic deep eutectic solvents (HDES, EO:octanoic acid (OA), EO:menthol (ME) and OA:ME:EO). The highest tensile strength (66.22 MPa) and elongation at break (45.99 %) were obtained in OA:ME:EO-40 and OA:ME:EO-80 films, respectively. The OA:EO-based films showed excellent and stable hydrophobicity. HDESs also endowed film with additional functionalities including thermal stability, bio-compatibility, controlled release, antioxidant, and antibacterial capacity. The extension of the storage period of strawberry treated with OA:EO-containing films confirmed their preservation ability. Compared with ME:EO and OA:ME:EO, OA:EO had better compatibility with chitosan matrix and could serve as a promising plasticizer for strengthening functionalities of chitosan film. These results also promote application of HDESs as emerging plasticizers in manufacture of other polymer-based packaging film.
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FOOD RESEARCH INTERNATIONAL
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2024
·
IF 7
Yanmei Xi,Yan Yang,Xuelu Chi,Weizhe Wang,Baoguo Sun,Nasi Ai
Ultra-high temperature (UHT) milk is popular among consumers. However, its flavor and texture change in its shelf life. Flavor is highly determinative for the success of dairy products and for consumers’ willingness to buy. It is important to milk producers to ensure the optimal flavor of their products in the shelf life. In order to be able to control and predict the flavor quality of UHT milk during the shelf life, this study compared the variations in sensory quality, volatile aroma release and backbone flavor factors and developed a discriminant model to assess flavor quality based on flavouromics data of five competing milk sample during storage. Using partial least squares discriminant analysis (PLS-DA) with Electronic-nose (E-nose) data excellent classification sensitivity and specificity were achieved compared to models based on gas chromatography-mass spectrometry (GC–MS) data. The PLS-DA model using E-nose data exhibited a 100% correct classification rate for the storage period, and a 92% correct rate based on the eight variable importance in the projection (VIP) elements screened for volatile components from different groups. The discriminative model developed herein based on E-nose combined with chemometrics demonstrated advantages such as speed, efficiency, and environmental friendliness. This method shows promise as a precise tool for analyzing aroma changes in UHT milk during its shelf life, and provide support for controlling the flavor substances and milk product development.
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ACS Nano
·
2025
·
IF 16
Yanhui Zhuang,Hao Yang,Yuhang Li,Yang Zhao,Huihua Min,Sheng Cui,Xiaodong Shen,Han-Yi Chen,Yifeng Wang,Jin Wang
Covalent organic frameworks (COFs) have shown promise as bifunctional catalysts to simultaneously mitigate shuttle effects and Li dendrite issues of lithium–sulfur (Li–S) batteries. However, the inherent low conductivity of the COFs has significantly limited their catalytic activity and stability. Herein, bifunctional catalytic activity and durability of the COF/MXene heterostructure are activated by tuning the surface curvatures of COFs interfaced with MXene. The increased curvature of COFs could induce enhanced electron delocalization and alter heterostructure geometry, which in turn strengthens lithium polysulfide adsorption, lowers energy barriers, and stabilizes catalytic sites to promote sulfur redox reactions. Concurrently, the hierarchical COF/MXene structure improves electrolyte penetration and wettability, facilitates rapid ion transport, and homogenizes the Li-ion flux distribution, thus achieving uniform lithium deposition. Consequently, the 1D-COF/MXene Li–S batteries demonstrate a high-rate capacity of 926 mA h g–1 at 4C, a stable cycling performance with a reversible capacity of 589 mA h g–1 at 3C after 500 cycles, and a high reversible capacity of 604 mA h cm–2 with a sulfur loading of 3.5 mg cm–2 under a low electrolyte-to-sulfur ratio of 10 μL mg–1. This work offers an efficacious approach to regulate catalytic activity and stability of catalysts.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Jiaqi Li,Yingyi Nong,Jisong Yao,Leimeng Xu,Zhi Yang,Shalong Wang,Jizhong Song
Metal halide perovskite quantum dot-based light-emitting diodes (QLEDs) have garnered considerable attention for realizing wide color gamut displays. Despite the breakthrough achieved in sky-blue perovskite QLEDs, it is still challenging to realize efficient Rec. 2020-blue perovskite QLEDs. Herein, a triphenylamine derivative-tailored hole transport layer (HTL) strategy is proposed for improving hole injection in deep-blue perovskite QLEDs. The hole mobility of the tailored HTL (T-HTL) is enhanced by ≈3.5 times compared to the pristine HTL (P-HTL) by mixing the 4,4′-cyclohexylidenebis [N, N-bis(p-tolyl) aniline] (TAPC) into poly [bis(4-phenyl) (4-butylphenyl) amine] (Poly-TPD), and the highest occupied molecular orbital (HOMO) level of T-HTL is shifted down by 0.11 eV compared to P-HTL, facilitating hole injection into the emitting layer. The resulting deep-blue perovskite QLEDs exhibit an external quantum efficiency of 11.0% at 465 nm, meeting the Rec. 2020 standard and representing the state-of-the-art deep-blue perovskite QLEDs. Theoretical calculations and experimental results demonstrate that the enhanced hole transport capacity of the T-HTL is attributed to the intermolecular π–π stacking between TAPC and Poly-TPD. Other triphenylamine derivatives can also tailor the hole transport capacity and improve device performance, which demonstrates the universality of the proposed strategy.
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Small
·
2025
·
IF 12.1
Min Zhu,Ting Zhang,Jinlong Wu,Xiuli Wang,Jin Zhang,Feng Li,Jing Li
Lattice strain is widely recognized as an effective strategy for tuning transition metal catalytic activity, yet its direct impact on electrochemical CO₂ reduction (ECO₂RR) remains not fully understood. In this work, a strategy of Cu-doped Ag is employed to construct a series of AgCu nanosheet structures (NS) with varying lattice compression rates (from −1.90% to −2.75%). Density Functional Theory (DFT) calculations, along with in situ infrared spectroscopic analysis, demonstrate that Cu incorporation efficiently modulates the electronic structure of Ag, promoting enhanced charge transfer. Especially, the changed lattice compression rates can alter the charge density at adsorption sites, thereby ameliorating the surface coverage of CO and adsorption energy of the reaction intermediates ( * COOH and * CO). As a result, the AgCu 5% catalyst exhibits a maximum Faradaic efficiency (FE) of 95.5% for CO production in an H-cell and 98% in a flow cell at −0.8 V RHE , respectively. Simultaneously, the AgCu 5% catalyst achieves FE CO of above 86% in the ultrawide current range of 33–215 mA cm −2 . The work affords an effective way to use a strain compression strategy to improve the CO 2 reduction performance.
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BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Lili Xu,Qingqing Zhao,Haibo Liu,Dankui Liao,Aixing Tang,Youyan Liu
Limonene dioxide (LDO) is essential for manufacturing bio-based polycarbonate and non-isocyanate polyurethanes. Herein, we report a strategy for the chemoenzymatic epoxidation of (R)-(+)-limonene to LDO with high selectivity using Rhizopus oryzae whole cells. The presence of sufficient excess acid in the system is essential, in addition to overcoming the hydrolysis of the intermediate product, 1,2-limonene oxide, to accomplish the double epoxidation of limonene. When using a high concentration of H 2 O 2 and trisodium citrate, the conditions were effectively established, even when Novozym 435 was substituted, which had previously been reported to be ineffective in achieving high-yield double epoxidation of limonene. The transfer of H 2 O 2 and peracids between the cell and solvent slowed production. The total amount of peracids generated remained constant, but their concentrations remained moderate, favoring the double epoxidation of limonene. An LDO yield of 93 % and no intermediate product, limonene oxide, were obtained under optimized conditions within 20 h.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Qiaowen Zheng,Yanmei Zhou,Jiarong Huang,Heng Lu,Shaoru Wu,Junying Zhang,Yishan Li,Wenping Hong,Xiaohong Tan,Jinming Lin,Qiang Chen,Feiming Li,Zhixiong Cai,Maosheng Zhang
Cu-based perovskite nanocrystals (NCs) have received great interest as alternatives to lead-based perovskite NCs due to their unique advantages of resource abundance and being environmentally friendly. However, the issue of their inherent low luminous efficiency has limited the application of fluorescence sensing fields. In this work, a highly sensitive fluorescence sensor based on Cu-based perovskite NCs has been constructed by embedding Cs 3 Cu 2 I 5 NCs in room temperature curable deep eutectic solvents (Cs 3 Cu 2 I 5 -DES) for the detection of NH 3 gas in the atmosphere. In this strategy, Lauric acid-based DES with room temperature curable property were successfully synthesized and used as the supporting materials of Cs 3 Cu 2 I 5 -DES sensing film. When NH 3 gas exists, NH 3 can be adsorbed and enriched on the surface of Cs 3 Cu 2 I 5 -DES film, and react with the carboxyl group on the DES, which leads to a significant decrease in the fluorescence intensity of Cs 3 Cu 2 I 5 -DES film. Under optimized experimental conditions, the as-prepared sensing film demonstrated a good linear relationship between the decreased intensity of the fluorescence and the NH 3 concentration, and a low limit-of-detection (LOD) of 0.0642 ppm for NH 3 . Furthermore, the sensor also exhibited excellent selectivity and good stability.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yuanchao Lu,Ruixin Xiong,Xingyu Lin,Liangxiao Zhang,Xianghe Meng,Zisheng Luo
Rapidly and sensitively evaluating the acid value (AV) of edible oils is significant to ensuring food quality and safety. Cesium lead bromide perovskite nanocrystals (CsPbBr3 NCs) are an effective candidate for AV detection; however, their instability restricts wide applications. Herein, CsPbBr3@ZIF-8 was prepared by confining and growing CsPbBr3 NCs in situ into zeolitic imidazolate framework-8 (ZIF-8) to improve the stability, and a fluorescence sensor was established to evaluate the AV of edible oils. The results present that CsPbBr3 NCs (below 5 nm) with excellent optical properties were confined and grown in situ in micropores and mesopores of ZIF-8. Meanwhile, CsPbBr3@ZIF-8 had better long-term storage, ultraviolet-irradiation, and water-exposure stabilities, compared with CsPbBr3 NCs. Given the fact that free fatty acids (the major contributor of AV) decrease the fluorescence of CsPbBr3 NCs, the fluorescence intensities of CsPbBr3@ZIF-8 were negative-linearly related to oil AV (R2 = 0.9902) in 0.04–6.00 mg of KOH/g with a 0.06 mg of KOH/g limit of detection. Besides, the practical AV recovery was 92–101% with an average relative standard deviation of 2%. Furthermore, the detection time was 20 min. The response mechanism revealed that free fatty acids could remove surface ligands and increase surface defects to prompt the aggregation of CsPbBr3 NCs and the formation of lattice fringe dislocations, inducing a decrease in the fluorescence. Thus, a stable, sensitive, reliable sensor was established to evaluate the AV of edible oils.
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