INORGANIC CHEMISTRY
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2023
·
IF 4.6
Huimin Li,Ran Pang,Lihong Jiang,Da Li,Su Zhang,Hongjie Zhang
Current ultraviolet (UV) light sources are dominated by blacklights that contain mercury vapor. Improper disposal or accidental breakage of these lamps can lead to serious pollution. Phosphor-converted light-emitting diodes (pc-UV-LEDs) have the potential to replace these mercury-containing lamps, making them more environmentally friendly. To improve the adjustability of the UV emission and reduce production cost, a series of UV-emitting phosphors were developed by introducing Bi3+ in BaSc2Ge3O10 (BSGO) which has a broad bandgap of 5.88 eV. The phosphor exhibits a negative thermal quenching effect that results from thermally activated defects. Despite this, the emission intensity of the phosphor sustains up to 107% at 353 K and 93% at 473 K compared to the intensity at 298 K. The internal quantum efficiency and the external quantum efficiency reach 81.0 and 49.32%, respectively, under 305 nm excitation. A pc-UV-LEDs were fabricated by combining the phosphor with a chip. The resulting device emits a broad band ranging from 295 nm to 450 nm, covering part of the UVB (280 nm ∼ 315 nm) and UVA (315–400 nm) regions. Our work has the potential to promote the replacement of current blacklights, including high-pressure mercury lamps and fluorescent low-pressure mercury lamps, by pc-UV-LEDs in applications such as bug zappers and tanning beds. Moreover, the phosphor exhibits desirable long persistent luminescence, which extends its prospect of applications.
研究领域:
材料科学
·
光子学
·
固态照明
·
发光材料
·
光电子学
✓ 已验证
DOI
高影响因子
Functional Materials Letters
·
2018
·
IF 1.084
Jiarui Jin,Kejun Feng,Xiaohong Liu
BiOCl nanosheets were prepared through a simple solvothermal method. The obtained BiOCl nanosheets were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and UV spectroscopy. The average size of BiOCl nanosheets was 210 nm. The BiOCl nanosheets were applied as a finishing agent for cotton fabric, which can give the UV protection and photocatalytic degradation of RhB properties to cotton fabric. We made four different concentrations of finishing agents to coat the fabric by pad-dry-cure method. Furthermore, the UPF ratting and photocatalytic degradation of RhB were conducted. The finished cotton fabric exhibited excellent UV protection and photocatalytic property.
研究领域:
材料科学
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纺织工程
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光催化
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纳米技术
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2013
·
IF 2.468
Xiaohuan Liu,Jifu Wang,Shouhai Li,Xiaowei Zhuang,Yuzhi Xu,Chunpeng Wang,Fuxiang Chu
The aim of this study was to develop economically UV-absorbent and visible-transparent films. For this purpose, lignin was selected because of its strong ultraviolet (UV) absorbing property. Lignocellulosic butanol residue, as the by-product of lignocellulosic butanol production, is rich in biobutanol lignin (BBL). Herein, BBL was modified with acryloyl chloride and then copolymerized with n-butyl acrylate (BA) and methyl methacrylate (MMA) by free-radical polymerization. The chemical structure of poly(BA-co-MMA) chains was identifiable by 1 H NMR and 13 C NMR spectroscopies, combined with UV–visible spectra to confirm the existence of the aromatic groups that are attributed to BBL in the copolymer . This provided evidence that a BBL graft copolymer was successfully synthesized. The optical, photo-stability, chemical resistance, thermal and mechanical properties of the copolymer were evaluated. The copolymer film can absorb 96.2% of UV light, while allowing 70% or higher transmittance in the visible spectrum when the surface concentration of BBL-AC was 240 μg cm −2 . In addition, the copolymer film retained excellent absorption capacity in the UV region and high transparency in the visible light region after 75 min continuous UV-irradiation or when heated at 100 °C, rendering it potential to use as a UV-absorbent film. The copolymer exhibited good chemical resistance, thermal and mechanical properties compared with pure poly(BA-co-MMA). This strategy not only provides a novel approach for UV-absorbent films but also greatly extends the comprehensive utilization of BBL.
研究领域:
高分子科学
·
材料科学
·
可持续化学
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可再生资源
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功能薄膜
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2021
·Vol. 83
·期 6
·1278-1285
·
IF 1.915
Ye Miaomiao,Li Chengzhuo,Liu Xiaowei,Wang Lili,Chen Rong
Ultraviolet-activated permanganate (UV/PM) process is a novel advanced oxidation process (AOP), but its application potential remains to be evaluated. This work investigates the degradation of refractory organic pollutant by UV/PM in terms of efficiency, mechanism, and influencing factors. The target compound benzoic acid (BA), which is a micro-organic pollutant and is resistant to PM and UV treatment, can be efficiently degraded by UV/PM. The electron paramagnetic resonance spectra directly supported the formation of hydroxyl radical (HO•) and superoxide radical from UV photolysis of PM. Competitive kinetics experiments verified that acted as precursor of HO• and the good degradation performance of BA was due to the involvement of HO• and manganese(V). The rate constants of BA degradation showed a positive linear relationship with PM dosage in the range of 0.5–20 mg·L −1 , and the degradation process was significantly influenced by solution pH and natural organic matters but insensitive to chloride and bicarbonate at environmentally relevant concentrations. Compared to the typical UV-based AOP UV/hydrogen peroxide, UV/PM is a little inferior, indicating that optimization and enhancement is needed for this process before its possible practical application. The mechanism of HO• generation from photolysis of PM was parsed. The effects of operating parameters (e.g. PM dosage, pH, natural organic matters, alkalinity, and chloride) on UV/PM process were investigated. UV/PM process was compared with UV/H 2 O 2 . Optimization and enhancement is needed for UV/PM process before its possible practical application.
研究领域:
环境科学
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化学工程
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水处理技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
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2016
·
IF 2.758
Kehang Li,Zhe Zhao
Stereolithography (SLA) has been regarded as the most promising rapid prototype (RP) production method for ceramic parts recently because of its better precision in size and site control. The rheological behavior and curing behavior of suspensions are controlling factors for ceramic stereolithography. In this work, oleic acid (OA), stearic acid (SA) and Poly(Acrylate Ammonium) (PAA-NH 4 ) were studied as the surfactant for HDDA-based suspension formulation. Modified alumina particles exhibit different wettability with HDDA monomer and thus the different rheology behavior and stability between the formulated suspensions. OA shows the best performance among all three dispersants . 40 vol% alumina suspensions with a viscosity ˂3 Pa s at 30 s −1 shear rate were successfully formulated with OA and SA. A sintering density of 95% can be reached for the OA- and SA-modified alumina UV-curable resins.
研究领域:
材料科学
·
陶瓷
·
三维打印
·
高分子化学
·
表面化学
✓ 已验证
DOI
高影响因子
Water Cycle
·
2021
·
IF 0
Yuwei Pan,Zhujun Dong,Yi Pan,Yizhen Zhang
In this study, nitrilotriacetic acid (NTA) was used to enhance UV/Fe 0 /H 2 O 2 process for highly salty wastewater at neutral pH. The addition of Fe 0 could not accelerate the UV/H 2 O 2 process for salty wastewater treatment at neutral pH due to the precipitation of Fe ions. While NTA added into UV/Fe 0 /H 2 O 2 process which could form complex with Fe ion, the tartrazine removal could increase from 45.7% to 84.7% within 60 min. The k -value of the UV/Fe 0 -NTA/H 2 O 2 system to remove tartrazine is also 2.2 times higher than that in UV/Fe 0 /H 2 O 2 system. Meanwhile, the UV/Fe 0 -NTA/H 2 O 2 process could obtain good performance for salt wastewater treatment under a wide salt concentration level of 0–0.2 M. It can also expand the application range of pH to neutral pH. SEM and XPS characterization showed that the corrosion rate of Fe 0 in salty system was faster, and the presence of NTA could accelerate the recirculation of Fe 3+ /Fe 2+ on the Fe 0 surface. EPR spectroscopic analysis and scavenge experiments showed that • OH was the main reactive radical for the removal of tartrazine in the UV/Fe 0 -NTA/H 2 O 2 system. In addition, the k -value for removing tartrazine in various types of salt systems in the UV/Fe 0 -NTA/H 2 O 2 system was 3.2–4.2 times that of the UV/Fe 0 /H 2 O 2 system. It demonstrated UV/Fe 0 -NTA/H 2 O 2 processes fits to different types of salt system. Therefore, this study will provide a new method for the treatment of saline wastewater at neutral pH.
研究领域:
环境科学
·
化学工程
·
水处理技术
✓ 已验证
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2014
·
IF 2.354
Zhisong Lu,Mei Meng,Yanke Jiang,Jiale Xie
To overcome the bacteria-caused degradation of silk, an ultraviolet light (UV)-assisted in situ synthesis approach is developed to immobilize silver nanoparticles (AgNPs) on degummed silk fibers for antibacterial applications. Results show that AgNPs with excellent crystalline structures are efficiently attached on the silk surface in an irradiation time-dependent manner. The immobilization of AgNPs could greatly delay the thermal degradation of silk. The antibacterial activity of the AgNPs-coated silk is evaluated by the growth curve of bacteria, zone of inhibition and dual staining assays, clearly demonstrating its bacterial growth inhibition ability and bactericidal effects. This work offers potentials to produce specific AgNPs-coated antimicrobial silk for various applications in textile industry.
研究领域:
材料科学
·
微生物学
·
纺织工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 10
·2671-2679
·
IF 2.5
Gu Yuanchun,Liu Huaqian
Significant ultraviolet (UV) technology was used to create a new composite polymer electrolyte (CPE) membrane composed of poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP), benzophenone (Bp), and varying amounts of highly ion-conducting Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) particles. In lithium metal batteries, the CPE membranes demonstrated improved mechanical properties as well as superior electrochemical performances. CPE-15wt% LLZTO typically demonstrated the highest ionic conductivity (σ = 3.7 × 10 −3 S/cm) at room temperature, a high Li-transference (t + = 0.79), and a wider electrochemical stability window (ESW) above 5 V, as well as good mechanical strength (8.2 MPa). More importantly, the CPE-15wt% LLZTO membrane inhibits Li dendrite expansion in Li symmetric cells and exhibits long-term cyclic stability with a current density of 3 mA/cm 2 over 1150 h for Li/CPE-15wt% LLZTO/Li. The current study demonstrates that a UV-irradiated CPE membrane can be a promising electrolyte for next-generation lithium-metallic batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Journal of Bioresources and Bioproducts
·
2020
·
IF 0
Yun Hu,Puyou Jia,Qianqian Shang,Meng Zhang,Guodong Feng,Chengguo Liu,Yonghong Zhou
A novel phosphorous-containing acrylated epoxidized soybean oil-based (P-AESO) resin was developed via the ring-opening reaction of epoxidized soybean oil (ESO) with diphenylphosphinic chloride (DPPC), followed by acrylation of the resulting groups. The chemical structure was characterized by Fourier transform infrared spectroscopy (FT-IR), and 1 H nuclear magnetic resonance ( 1 H NMR). Subsequently, the viscosity and volumetric shrinkage of the obtained P-AESO resins were studied. Then the oligomer was formulated into UV-curable coatings, and the mechanical, thermal, and coating properties of the resulting UV-cured bioresins were studied by tensile testing, dynamic mechanical thermal analysis (DMA), thermogravimetric analysis (TGA) coupled with FT-IR spectroscopy (TGA-FT-IR), hardness, adhesion, pencil hardness and chemical resistance. Furthermore, the UV-curing behavior of the P-AESO resin was determined by real-time realtime infrared (RT-IR). Meanwhile, compared with coating from acrylated epoxidized soybean oil (AESO), the P-AESO system coatings showed better volumetric shrinkage, excellent adhesion, and enhanced thermal and glass transition temperature ( T g ) while maintaining reasonably final C = C conversions and cross-link density. For instance, the obtained P-AESO/trimethylolpropanetriacrylate (TMPTA) 20 material possessed a volumetric shrinkage of 4.1%, T g of 115.6°C, char yield of 9.47%, and final C = C conversions of 81.4% respectively, which exhibited superior values than that of the AESO/TMPTA20 material. The improvement of the P-AESO coating performances could contribute to the architectures that combined the structural features of phosphorous-containing rigid benzene. The developed P-AESO resin is promising for applications in the UV-curable coatings.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Zongjie Zhang,Jia Liang,Liangling Sun,Shaoying Wang,Qi Sun,Balaji Devakumar,Sami Rtimi,Xiaoyong Huang
In this study, in order to get near-ultraviolet-excitable cyan-emitting phosphors for white light-emitting diodes (LEDs), Ce 3+ ions were successfully doped into the newly discovered Ca 2 YHf 2 Ga 3 O 12 (CYHG) matrix through the high-temperature solid-state reactions. The obtained samples exhibited a broad excitation band in the 250–450 nm wavelength range centered at about 346 nm and 398 nm, and they showed an intense cyan emission band in the 410–600 nm wavelength range peaking at about 479–485 nm Ce 3+ doping concentration dependent luminescence properties in CYHG: x Ce 3+ phosphors were studied, and the optimal Ce 3+ doping concentration was found to be x = 0.04. Furthermore, the energy transfer mechanism between Ce 3+ ions was confirmed as the dipole-dipole interaction, which induced the observed concentration quenching effect. Notably, upon excitation by near-ultraviolet light at 398 nm, the CIE chromaticity coordinates of CYHG:0.04Ce 3+ sample were obtained to be (0.182, 0.276), which were located in the cyan color range. Besides, the internal quantum efficiency (IQE) values of these CYHG: x Ce 3+ phosphors were measured, and the highest one reached up to 26%. These newly developed cyan-emitting CYHG:Ce 3+ phosphors might find potential application in high-color-rendering white LEDs by covering the so-called cyan gap.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Qian Wu,Yun Yang,Chenchong Ma,Zheng Chen,Qinting Su,Caizhen Zhu,Yuan Gao,Rui Ma,Cuihua Li
The inherent safety issues of commercial organic liquid electrolytes make it hard to deploy them in lithium metal batteries. By contrast, nanocomposite polymer electrolytes (NCPEs) can not only suppress the growth of lithium dendrites but also have the functions of separators to substitute the liquid electrolytes. In this work, a kind of NCPE was designed by in situ hydrolysis of tetrabutyl titanate to form in situ TiO2 nanoparticles throughout the UV curing cross-linked polyurethane acrylate network, and the addition of an ionic liquid as a plasticizer further enhanced the safety property of the NCPE due to its intrinsic excellent thermal stability. The optimized NCPE-4 sample shows a high ionic conductivity of 1.1 × 10–3 S cm–1 at 30 °C, a sufficiently stable interface compatibility between the NCPE and electrode, and a higher electrochemical stability window of 4.8 V (vs Li/Li+). More interestingly, the assembled LiFePO4/NCPE-4/Li coin cell attains a discharge capacity of 149.1 mA h g–1 after 200 cycles at 0.5 C, and even at the high rate of 3 C, the capacity still stays over 83 mA h g–1. These results demonstrate that the novel NCPE-4 could be a promising candidate for the practical applications in lithium metal batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Advanced Materials Technologies
·
2021
·Vol. 7
·期 7
·2101283
·
IF 7.848
Xia Sun,Mengmeng Yao,Shaoshuai He,Xiaoru Dong,Lei Liang,Fanglian Yao,Junjie Li
Skin-attachable conductive hydrogels are ideal candidates for the design of flexible and wearable electronics, and tremendous efforts are devoted to preparing multifunctional hydrogels. However, antibacterial ability and ultraviolet (UV)-blocking property are still essential yet rarely reported. In this study, a novel ionically conductive multifunctional polyacrylamide (PAAm)/chitosan (CS)/tannic acid (TA) hydrogel (PCT hydrogel) with transparency, adhesiveness, antibacterial activity, and UV-blocking ability simultaneously is fabricated via a facile one-pot strategy. In the hydrogel, PAAm chains form the backbone of PCT hydrogel, CS and TA endow hydrogel with antibacterial activity (>97%) and UV-blocking ability (>96%), respectively. More importantly, existing free ions also endue PCT hydrogel with conductivity (0.256 ± 0.005 S m −1 ) and strain sensitivity (GF > 3). The prepared PCT hydrogel-based strain sensors can effectively monitor various human movements, indicating their huge potential in soft robotics, human–machine interaction, and health-monitoring systems.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
·
可穿戴技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）