OPTICAL MATERIALS
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2023
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IF 3.9
Jun Sun,Wei Zhu,Bei Zhang,Feifei Huang,Limin Hu,Hongping Ma,Renguang Ye,Youjie Hua,Shiqing Xu
Full-spectrum white LED (w-LED) lighting is primarily achieved through the combination of multiple-color phosphors excited by the chip, and making the development of efficient multi-color phosphors based on single matrix is an excellent choice for full-spectrum w-LED. In this paper, a series of Rb 2 KNa(Li 3 SiO 4 ) 4 : xEu 2+ (0.1 % ≤ x ≤ 15 %) phosphors were successfully synthesized via high-temperature solid-state reaction with varied Eu 2+ concentration. At low doping concentration, the Eu 2+ ions exhibit primarily green emission at 530 nm in the phosphor. However, as the doping concentration of Eu 2+ ions increase, the emission spectrum undergoes a significant transformation. A cyan emission occurs at 478 nm, resulting in the spectral conversion from a green single-peak emission to a dual-peak emission of cyan and green. The spectral conversion is attributed to the changes in the positioning of Eu 2+ ions within the crystal lattice . The obtained phosphors demonstrate excellent thermal stability and can be utilized in w-LED devices. After encapsulation with a blue LED chip, it achieves a color rendering index of 91.8 and a correlated color temperature of 4085 K, showcasing its significant application value in the field of full-spectrum w-LED.
研究领域:
材料科学
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光电子学
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固态化学
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荧光粉技术
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照明工程
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高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2023
·
IF 6
Jiaxin Chen,Xue Liang,Baohua Kong,Hui Wang,Hongwei Zhang,Jie Tang,Qian Liu,Xin Li
Addition of different (−)-epigallocatechin-3-gallate (EGCG) (0, 100, 200, 500 or 1000 mg/L emulsion) on the interfacial composition and protein-lipid co-oxidation of whey protein isolate (WPI)-stabilised oil-in-water (O/W) emulsions were studied, and underlying mechanisms were also explored. The results indicated that the physical stability of emulsions gradually decreased with the increasing level of EGCG during storage, which clearly verified by decreasing ζ-potential absolute values and increasing droplet size. Moreover, the combination between WPI and EGCG by covalent/non-covalent binding for either adsorbed proteins (AP) or unadsorbed proteins (UAP) led to aggregation and conformational changes in WPI, which confirmed and characterised by electrophoresis, fluorescence quenching, and molecular docking simulation. Meanwhile, the concentration of AP slightly decreased as a function of EGCG level and storage time, however, the UAP showed the opposite change tendency, indicating that EGCG could effectively modulate the interfacial adsorption property of WPI in O/W emulsions. In addition, the incorporation of EGCG efficiently suppressed protein-lipid co-oxidation of O/W emulsions during storage, which was illustrated by hierarchical cluster and correlation analysis between protein and lipid oxidation products. Our results clearly revealed the viability of the EGCG to modulate the interfacial composition and retard the co-oxidation of O/W emulsions with enhanced storability.
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FOOD RESEARCH INTERNATIONAL
·
2023
·
IF 8.1
Jiaxin Chen,Junjie He,Zihan Zhao,Xin Li,Jie Tang,Qian Liu,Hui Wang
This work aimed to investigate the effects of heat treatments at different temperatures (60, 70 and 90 °C, expressed as HT-60, HT-70 and HT-90) on interfacial composition and protein-lipid co-oxidation in whey protein isolate (WPI)-stabilised O/W emulsions during storage. Compared with control group, all heated emulsions exhibited weaker physical stability over 10 days of storage, which verified by the increased droplet size, as well as decreased adsorbed protein levels and absolute ζ-potential values. Moreover, proteins recovered from the HT-90 emulsion showed the highest fluorescence intensity and red-shift of the maximum emission wavelength, indicating partial unfolding of the protein structure. Meanwhile, severe changes in protein structure were also observed in the HT-70 and HT-90 emulsions, which clearly verified by the degradation of bovine serum albumin, α-lactalbumin and β-lactoglobulin. Furthermore, HT-70 and HT-90 emulsions showed lower levels of lipid hydroperoxides and thiobarbituric acid reactive substances. In contrast, the recovered proteins were subject to severe oxidative stress as indicated by carbonyl and N’-formyl-L-kynurenine. Hierarchical cluster and correlation analysis implied that the process of protein-lipid co-oxidation is inevitable, but it can be retarded by heat treatment. Our results clearly revealed the relevance among heat treatment, interfacial adsorption property, and the protein-lipid co-oxidation of O/W emulsions.
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PubMed
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 10
·3363-3371
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IF 6.177
Gang Xu,Chenyu Chen,Mengxia Li,Xinyi Ren,Lianggao Hu,Chengrong Wu,Yu Zhuang,Fanan Wang
The electrocatalytic HMF oxidation reaction (HMFOR) is one of the promising technologies for the valorization of biomass derivatives and potential replacements for the energy-consuming oxygen evolution reaction (OER). For the most investigated Ni-based electrode, the in situ reconstruction from Ni(OH)2 to NiOOH is hardly avoidable during the electro-oxidation reaction, which is also a highly indispensable prerequisite towards HMFOR. Herein, we developed an efficient strategy of sacrificing W to investigate the effect of surface defects on the self-reconstruction of Ni for promoting HMFOR. It was rationalized that the selective and rapid exsolution of the W species from the as-prepared NiW layer created a porous structure and induced lattice defects on the surface, which facilitated the ion and electron transportation, and further promoted the in situ reconstruction for the formation of higher oxidated Ni with superior activity for HMFOR. This work offers a novel and low-cost means to enrich the active sites for the electrocatalytic upgrading of HMF and other bio-derived platforms.
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ORE GEOLOGY REVIEWS
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2021
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IF 3.809
Ye Qiu,Rongqing Zhang,I-Ming Chou,Xiaolin Wang,Wenxuan Hu,Wenlan Zhang,Jianjun Lu,Guanglai Li,Zhen Li
Boron (B) is an important volatile component in many ore-forming fluids of hydrothermal deposits related to granites. The Maoping and Piaotang W-Sn deposits are typical magmatic-hydrothermal deposits located in South China. In this study, boron (i.e., H 3 BO 3 )-rich fluid inclusions are discovered in the above two deposits through in situ Raman spectrosocpic analyses. Based on careful experimental calibrations, we calculated the ratio of relative molar scattering factors between water and H 3 BO 3 ( J H 2 O / J H 3 B O 3 ). In addition, the relationship between salinity and J H 2 O / J H 3 B O 3 was constructed. Then, Raman spectroscopic quantification of the NaCl-H 3 BO 3 -H 2 O solutions was proposed. Because corrections for the response function of the spectrometer and the influences of the wavenumber and temperature on the spectral intensity were applied, our Raman spectroscopic quantifications allow comparison across different laboratories. The salinity [ m NaCl in m (mol/kg H 2 O)] and molality of B ( m H 3 BO 3 ) for topaz-hosted fluid inclusions at the Maoping W-Sn deposit were determined to be 0.29–1.48 m and 0.06–0.46 m , respectively. A large quartz crystal was collected from a wolframite-bearing quartz vein of the Piaotang W-Sn deposit. The H 3 BO 3 concentration of fluid inclusions in this crystal was determined using Raman spectroscopy. From the core to the rim, m H 3 BO 3 and m NaCl do not show monotonic changes; m H 3 BO 3 fluctuates between 0.11 and 0.33 m , while m NaCl ranges from 0.11 to 1.41 m . Further thermodynamic calculations revealed moderately acidic ore-forming fluids with pH ranging from 4.9 to 5.1 at 23 °C. The fluctuation of m H 3 BO 3 during the growth of a single quartz crystal indicates the episodic replenishment of magmatic-hydrothermal fluids. In addition, microthermometric measurement can result in non-negligible uncertainties in the fluid compostion determination for such complex NaCl-H 2 O-H 3 BO 3 -CO 2 -N 2 -CH 4 fluid system. Alternatively, Raman spectroscopy can provide non-destructive and fast quantification of such fluid inclusions based on careful experimental calibrations.
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Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 30
·6459-6468
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IF 5.344
Xiaodan Zhang,Yuwan Lu,Qiumeng Chen,Yuming Huang
A self-templated strategy was adopted to design hollow Co3O4/MO3 (M = Mo, W) mixed-metal oxides via the Mo or W doping of ZIF-67, and subsequent pyrolysis under an atmosphere of air at a low temperature of 450 °C. The hollow Co3O4/MO3 (M = Mo, W) mixed-metal oxides displayed tunable oxidase-like and peroxidase-like activities able to efficiently catalyze the oxidation of TMB to generate a deep blue color in the absence or presence of H2O2. Relative to that of the un-doped Co3O4, the oxidase mimic activity of the Mo-doped Co3O4 increased to 1.3 to 2.1-fold, while its peroxidase mimic activity increased to 7.1 to 19.9-fold, depending on different Mo doping amounts. The oxidase mimic activity of the W-doped Co3O4 increased to 2.1 to 2.3-fold, while its peroxidase mimic activity increased to 4.8 to 5.9-fold, depending on the different W doping amounts. The Mo- and W-doped Co3O4 nanohybrid exhibited both higher O2 and H2O2 activating capability, and their H2O2 activating capacity was superior to the O2 activating capability. Furthermore, the Mo- and W-doped Co3O4 nanohybrids exhibited similar O2 activating abilities, while the Mo-doped one displayed a higher H2O2 activating capability than the W-doped one. The discrepant peroxidase-like nature of Mo- and W-doped Co3O4 nanohybrids is likely attributed to their different catalytic mechanisms. The peroxidase-like activity of Mo-doped Co3O4 is highly related to the ˙OH free radical, while that of W-doped Co3O4 is likely ascribed to the electron transfer between TMB and H2O2. The Km values of Co3O4/MoO3 for TMB and H2O2 were 0.0352 mM and 0.134 mM, which were 3.2- and 1.9-fold lower than that of pure Co3O4, respectively. A Co3O4/MoO3-based colorimetric platform was developed for the determination of H2O2 in the 0.1–200 μM range, with a limit of detection of 0.08 μM (3σ). Based on the thiocholine (TCh) inhibition of the excellent peroxidase-like activity of Co3O4/MoO3 and the TCh generation via acetylcholinesterase (AChE) catalyzed hydrolysis of acetylthiocholine chloride (ATCh), the colorimetric platform was extended to screen AChE activity and its inhibitor.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jianxu Wang,Yan Xie,Junlan Guo,Xuemei Yao,Xue Geng,Jing Gao,Xuyao Feng,Zijing Zhou,Yuanyuan Liu,Bin Deng,Ruijin Yu
Novel apatite-type NaCa 3 Bi(PO 4 ) 3 F: x Sm 3+ (0.01 ≤ x ≤ 0.30) orange-red-light phosphors were synthesized through the solid-state method at high temperature. The crystal structure, energy band structure , density of state, phase purity, particle morphology , photoluminescence properties, thermostability, and luminescence decay of the phosphors were comprehensively characterized. When λ ex = 404 nm, the optimal NaCa 3 Bi(PO 4 ) 3 F:0.05 S m 3+ phosphor showed the orange-red emission (597 nm). The NaCa 3 Bi(PO 4 ) 3 F:Sm 3+ phosphors exhibited abnormal thermal quenching properties as their emission intensity increased by about 2.57% from 300 to 380 K. Their intensity at 440 K was still 1.01-fold stronger than that at room temperature. The abnormal thermal quenching mechanisms were well explained via the coordinate configuration scheme. The thermal activation energy ( E a ) was calculated to be 0.79 eV. The color purity of all the phosphors reached 99.9%. Ultimately, a white light-emitting diode (w-LED) was fabricated based on the tri-color RGB method. The color rendering index and the chromaticity coordinates of the fabricated w-LED were 89 and (0.310, 0.319), respectively. Thus, these high thermostability NaCa 3 Bi(PO 4 ) 3 F:Sm 3+ orange-red phosphors can be potentially used in w-LED applications.
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高影响因子
LANGMUIR
·
2025
·
IF 3.9
Denghui Huang,Xiaolan Fu,Kaixin Wang,Zicheng Zheng,Liyuan Zhang,Zhizhen Ye,Jie Jiang,Zhong-kang Han,Liping Zhu
Oxygen vacancies play a crucial role in charge transport and surface states in semiconductor metal oxides, significantly influencing various research fields, such as photocatalysis and gas sensor. Developing effective strategies to generate oxygen vacancies and thereby enhance device performance is highly desirable. In this study, we proposed a water-based one-step electrospinning method to introduce hydroxyl groups, leading to the synthesis of Pt-decorated WO3 nanofibers (Pt-WO3(H2O)) with increased oxygen vacancies. Density functional theory calculations revealed that the dissociation energy of W–OH is lower than that of the W–O bonds, promoting the formation of oxygen vacancies via W–OH bond cleavage. These vacancies reduced the adsorption energy of acetone on the WO3 surface, enhancing surface interactions. Consequently, the Pt-WO3(H2O) sensor exhibited an ultrahigh response of 82 to 1.8 ppm acetone at 300 °C, which was about 1 order of magnitude higher than the one fabricated by conventional electrospinning. These findings indicate that water-based electrospinning is an effective technique for generating oxygen vacancies in metal oxide nanofibers. Our high-performance acetone sensor, capable of detecting low concentrations, holds great potential for applications in noninvasive health screening.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Huiting Lin,Yichang Ma,Xiaocan Wang,Guiqin Yi,Aimei Zhu,Qinglin Liu,Qiugen Zhang
Ether-free proton exchange membranes (PEMs) based on aromatic polymers are considered as potential alternatives to perfluorosulfonic acid (PFSA) PEMs due to their low cost, less reactant crossing, exceptional chemical stability and outstanding thermal stability. Herein, a series of high-performance sulfonated poly(biphenyl alkylene) (BPSA-PT- x ) membranes with full carbon chain backbones were synthesized to investigate the effect of different ratios of hydrophobic components on membrane properties. Among the prepared membranes, the BPSA-PT-10 % PEM with the highest proton conductivity (311 mS cm -1 at 80 °C water) possessed excellent dimensional stability (in-plane swelling rate ≤19.7 %, through-plane swelling rate ≤24.9 %), mechanical properties (elongation at break: 89.8 % in wet state), thermal stability (glass transition temperature >450 °C) and low H 2 crossover (1.80 mA cm -2 ). Further, the assembled H 2 /O 2 fuel cell based on BPSA-PT-10 % PEM exhibited competitive performance with a peak power density of 2.62 W cm -2 . The developed poly(biphenyl alkylene)-based PEMs should have potential applications in hydrogen energy field.
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ULTRASONICS SONOCHEMISTRY
·
2024
·
IF 8.7
Xiaojie Hu,Ting Xiao,Qidong Huang,Shichen Liu,Hongxia Liu,Sili Ren,Dandan Gong,Wuhui Luo
The use of a resin to selectively separate thiomolybdate from a tungsten (W) feed solution is a well-known protocol for achieve high-purity W products; however, the regeneration of saturated resin is laborious. In this study, poly(diallyl dimethyl ammonium chloride) (PDADMA) was used to modify ultrasound-pretreated montmorillonite (Mt) for W and molybdenum (Mo) separation for the first time, and the resultant tetrathiomolybdate (MoS 4 2- )-loaded composite was further tested to remove heavy metals instead of regeneration. Among the three variables of ultrasound pretreatment, that is, Mt concentration, ultrasound power, and treatment time, the Mt concentration exhibited the most significant influence followed by ultrasound power on the separation performance of W and Mo. Compared to the distance of the interlayer space and the surface charge of the modified Mt, the PDADMA content showed a closer correlation with the W/Mo separation coefficient. Assisted by Box–Behnken design, with Mt concentration of 6.9 g/L, ultrasound power of 593.8 W, and treatment time of 13.8 min, the composite with the greatest separation coefficient was obtained. The adsorption of Cu(II) on the optimal W/Mo separation-derived composite was ascribed to the formation of Cu-S complexes, while that of Pb(II) was attributed to complexation and surface precipitation. In contrast, ion exchange with the initially loaded anions, reduction by sulfide to Cr(III), and formation of Cr(III)-S complexes accounted for Cr(VI) removal. The adsorption of Cu(II) and Pb(II) equilibrated faster and showed higher acid-resistance than that of Cr(VI). The adsorption capacities for Cu(II), Pb(II), and Cr(VI) were 0.535, 1.398, and 0.882 mmol/g, respectively. Applying PDADMA to modify Mt as a reagent for W/Mo separation was feasible, and the derived composite was capable of removing cationic and anionic heavy metals.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Weiping Zhang,Guiying Li,Wanjun Wang,Yaxin Qin,Taicheng An,Xinyan Xiao,Wonyong Choi
A chemically modified Ag 3 PO 4 @MS 2 (M = Mo, W)/rGO composite was firstly synthesized via a liquid-exfoliation solvothermal method. The structure, morphology, optical properties and composition were characterized by X-ray diffraction, FT-IR spectroscopy, scanning electron microscopy, UV–vis diffuse reflectance spectra and X-ray photoelectron spectroscopy, respectively. The characterization results indicated that compact structure could be obtained by using this typical method due to in-situ chemical modification, which could also control the sizes of Ag 3 PO 4 nano-sheets by adding MS 2 /rGO hybrids. More importantly, the resultant Ag 3 PO 4 @MS 2 /rGO composite exhibited higher photocatalytic activity and stability toward the degradation of 4-nitrophenol than pure Ag 3 PO 4 under sunlight irradiation. The stable structure of Ag 3 PO 4 @MS 2 /rGO was closely related with Z-scheme electronic structure and electrical conductivity of MS 2 /rGO hybrids, leading to a higher consumption and transfer of photogenerated electrons. However, by controlling the amounts of MS 2 /rGO hybrids, more stable but lower photocatalytic activity composites could be obtained. Further analysis found that the holes and O 2 − were the main reactive species involved in the photocatalytic degradation of 4-nitrophenol. In addition, possible photocatalytic degradation pathways of 4-nitrophenol were also proposed based on the identified intermediates. The findings of this work may provide a new method to design efficient composites for photocatalytic degradation of organic pollutants .
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FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Chenzhi Wang,Yan Li,Wei Xiong,Qiang Liang,Xin Hua,Pu Xuan,Wei Lin,Yingzheng Yao
The correlation between the structural parameters of droplets and rheological properties of O/W high internal phase Pickering emulsions (HIPPEs) stabilized by soy protein isolate (SPI) nanoparticles was elucidated, with a volume fraction of dispersed phase ( ϕ ) above the closest packing density (74%). The structural basis of SPI nanoparticles was confirmed to be spherical heat-induced protein aggregates, which had moderate wettability and excellent interfacial activity. The structural parameters of emulsion droplets (contact length L , diameter D , length d 1 , width d 2 , the number of adjacent contact droplets Z ), and the stability and rheological properties of HIPPEs were characterized by the confocal laser scanning microscopy (CLSM), diffusing wave spectroscopy (DWS), and mechanical rheometer respectively. The results of CLSM indicated the transition of droplets from spherical to polyhedral shapes as increased ϕ , accompanied by an increased L and Z . The rheological and stability analysis confirmed the widened linear viscoelastic range, elevated gel point ( ε c ), and the extended half−life of the intensity autocorrelation function of HIPPEs as ϕ increased. Moreover, the loss factor (tan δ ) remained constant at 0.1 within the ϕ of 74%–86%, revealing the solid−like nature of HIPPEs. The correlation between ϕ , structural parameters of droplets, and rheological properties of HIPPEs was further analyzed. The nonlinear regression fitting between the L / D and G ' (elastic modulus) yielded a better fitting effect than d 1 / d 2 and Z , suggesting an intrinsic correlation between emulsion structure and rheology. In summary, this study elucidated the intricate relationship between ϕ , droplet structure, and rheological properties of HIPPEs, offering a research foundation and theoretical basis for the development and application of protein particle−stabilized HIPPEs.
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