MOLECULES
·
2023
·Vol. 28
·期 11
·4566
·
IF 4.6
Yuhan Gao,Lei Feng,Linglin Wang,Jun Zheng,Feiyao Ren,Siyu Liu,Zhanglei Ning,Ting Zhou,Xiaochun Wu,Xin Lai,Daojiang Gao
Nowadays, Mn4+-activated fluoride red phosphors with excellent luminescence properties have triggered tremendous attentions for enhancing the performance of white light-emitting diodes (WLEDs). Nonetheless, the poor moisture resistance of these phosphors impedes their commercialization. Herein, we proposed the dual strategies of “solid solution design” and “charge compensation” to design K2Nb1−xMoxF7novel fluoride solid solution system, and synthesized the Mn4+-activated K2Nb1−xMoxF7(0 ≤x≤ 0.15,xrepresents the mol % of Mo6+in the initial solution) red phosphors via co-precipitation method. The doping of Mo6+not only significantly improve the moisture resistance of the K2NbF7: Mn4+phosphor without any passivation and surface coating, but also effectively enhance the luminescence properties and thermal stability. In particular, the obtained K2Nb1−xMoxF7: Mn4+(x= 0.05) phosphor possesses the quantum yield of 47.22% and retains 69.95% of its initial emission intensity at 353 K. Notably, the normalized intensity of the red emission peak (627 nm) for the K2Nb1−xMoxF7: Mn4+(x= 0.05) phosphor is 86.37% of its initial intensity after immersion for 1440 min, prominently higher than that of the K2NbF7: Mn4+phosphor. Moreover, a high-performance WLED with high CRI of 88 and low CCT of 3979 K is fabricated by combining blue chip (InGaN), yellow phosphor (Y3Al5O12: Ce3+) and the K2Nb1−xMoxF7: Mn4+(x= 0.05) red phosphor. Our findings convincingly demonstrate that the K2Nb1−xMoxF7: Mn4+phosphors have a good practical application in WLEDs.Keywords:fluoride;phosphor;luminescence performance;thermal stability;moisture resistance
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Mingchen Jia,Yongjun Li,Chunqing He,Xiaoyu Huang
High durability of low-k value is a desired property for dielectrics serving under humid conditions, because absorbing a small amount of moisture by the material can considerably increase the k value so as to result in function deterioration. Aiming to develop a dielectric polymer with superior durability of low-k value and high thermal stability, a perfluorocyclobutyl (PFCB) biphenyl ether-based polyimide, PFCBBPPI, was synthesized. This polymer possesses a Tg of 310.3 °C and a 5% weight loss temperature of 510.5 °C. PFCBBBPPI exhibited an extremely low water uptake of 0.065 ± 0.018%, representing the best water resistance in polyimides. The increasing percentage in k value was below 2% for PFCBBPPI film exposed to moisture under various humidity conditions for 6 h. PFCBBPPI film equilibrated at 75% R.H. for 2 weeks still kept its k value below 2.50, remarkably outperforming the Kapton film. The remarkable water resistance and resulting high durability of low-k property displayed by PFCBBPPI are originated from the hydrophobic nature and small free volume fraction of the polymer, as confirmed by contact angle test and positron annihilation lifetime spectroscopy results. The outstanding moisture resistance and overall performance of PFCBBPPI make it a suitable candidate for dielectric applications under both dry and humid conditions.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yanrong Liao,Sizhao Zhang,Shuai Yu,Kunming Lu,Mingkang Wang,Yunyun Xiao,Feng Ding
Bio-based aerogel is a functionalized nanoporous material with environmentally friendly, high surface area, ultra-low density, high porosity, and low thermal conductivity, making it suitable for various applications such as energy-saving buildings, electronic information, separation, adsorption, catalysis, biomedicine, and others. However, the current bio-based chitosan aerogel still faces great challenges in reaching multifunctional improvement to address its intrinsic shortcomings. Herein, we propose a new approach depending upon supramolecular interactions for constructing chitosan/bacterial cellulose aerogels that simultaneously possess superior moisture resistance/fatigue, anti-thermal-shock, and flame retardancy. Specifically, the aerogels demonstrate remarkable characteristics, namely high strength (self-standing itself weight beyond 10,676 times), low thermal conductivity (lowest to 22 mW m −1 K −1 under normal pressure and room temperature), and excellent fatigue resistance (almost negligible permanent deformation at 1 % strain even undergoing compressive cycles up to 10,000 times). On the other hand, the aerogels display exceptional moisture resistance with superhydrophobicity (moisture absorption rate <0.88 % for 160 h at 70 °C and 85 % relative humidity), excellent thermal shock property (withstand cold-hot shock up to 200 cycles with rapid temperature changes between −30 °C and 60 °C), and remarkable fire retardancy (swiftly self-extinguishing in 0.6 s). Additionally, the compressive stress increases to 0.223 MPa at 3 % strain after hydrophobic treatment, representing a 27 % enhancement in mechanical robustness. Further, the mechanism responsible for microstructural evolution has been also established in different strain conditions. This work may provide rich possibilities for developing multifunctional bio-based aerogel for energy-saving buildings.
研究领域:
材料科学
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生物工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yufan Wei,Qianxing Huang,Shijie Yu,Qiyue Shao,Jianqing Jiang
The K2SiF6:Mn4+ (KSFM) phosphor featuring efficient ultranarrow red emissions is an outstanding candidate for white light-emitting diode (WLED) applications. However, poor moisture resistance seriously affects its application performance. In this study, a two-step surface reconstruction strategy is proposed to dramatically enhance the moisture resistance of commercially available KSFM phosphors, involving treatment with H2NbF7 and subsequent hydrothermal treatment. The modified KSFM phosphor exhibits a high internal quantum efficiency (IQE) of 98.9% after the two-step surface treatment. Meanwhile, nearly 100% of the initial emission intensity is retained for the modified KSFM phosphor even after aging in high temperature (85 °C) and high relative humidity (85% RH) environments for 6 days, in sharp contrast to only 18.6% retention for the original KSFM phosphor. The relative emission intensity of the modified KSFM remains at 98.9% even after being immersed in water for 6 h. Additionally, the phosphor-converted LED fabricated with the modified KSFM phosphor demonstrated excellent long-term stability, retaining up to 97.9% of initial luminous efficacy after aging under 85 °C and 85% RH conditions for 500 h. The moisture-resistance mechanism is elucidated on the basis of spectroscopic analysis as well as structural and compositional characterization of the phosphor surface layer, which can be attributed to the formation of a robust Mn4+-rare shell with high crystalline quality following this two-step surface treatment. The findings contribute to the performance improvements of KSFM phosphors for industrial applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 8
·2401-2407
·
IF 6.641
Yong Liu,Zhi Zhou,Lin Huang,Mikhail G. Brik,Shuaichen Si,Litian Lin,Tongtong Xuan,Hongbin Liang,Jianbei Qiu,Jing Wang
Narrow-band red-emitting fluoride phosphors for wide color gamut LED backlights have evoked considerable attention, due to their fascinating optical properties. Unfortunately, poor moisture resistance often restricts their further applications in optoelectronics. Herein we developed a Cs2SiF6:Mn4+ red phosphor using a low-temperature co-precipitation method and passivating it by using H2O2. The phosphor shows a very high external quantum efficiency (EQE) of ∼85% and exhibits excellent moisture stability retaining 74% of its emission intensity after being exposed to high temperature (85 °C) and high humidity (85%) (HTHH) for 168 h. Finally, the high brightness white LED devices combined with the passivated Cs2SiF6:Mn4+ exhibit high luminous efficacy of 133 lm W−1 and wide color gamut (∼84.7% NTSC). The results demonstrate that the passivated Cs2SiF6:Mn4+ with high EQE and excellent moisture-resistance is promising as a narrow-band red emitting phosphor for wide color gamut LED backlights.
研究领域:
材料科学
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光电技术
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Maoping Lu,Yingchun Liu,Xiangxiang Du,Shiheng Zhang,Guokang Chen,Qian Zhang,Sa Yao,Liyan Liang,Mangeng Lu
In this work, a cycloaliphatic epoxy resin hexahydrophthalic acid bis(3,4-epoxycyclohexylmethyl) ester (BE) was prepared and cured with anhydride. The curing kinetics and properties of the cycloaliphatic epoxy resin were characterized and compared with (3′,4′-epoxycyclohexane) methyl-3,4-epoxycyclohexyl-carboxylate (CE) and bis(3,4-epoxycyclohexylmethyl) adipate (BA). The result shows that BE/4-methyl hexahydrophthalic anhydride (MHHPA) exhibits a higher reaction activation energy and a slower curing rate than CE/MHHPA and BA/MHHPA. The loss modulus of BE/MHHPA increased 53 and 24% compared to CE/MHHPA and BA/MHHPA, respectively. The Young’s modulus and initial degradation temperature of BE/MHHPA improved 31 and 6.4% compared with those of BA/MHHPA. Furthermore, superior moisture resistance and dielectric properties are expressed for BE/MHHPA among these epoxy resins. Those results demonstrated the potential usefulness of BE/MHHPA in the electronic packaging materials field.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Xuan Li,Yuyan Cao,Yihui Shen,Yulin Wu,Shicong Cui,Lingli Cheng,Xuechun Yang,Zheng Jiao
Nowadays, designing sensing materials possessing both high sensitivity and humidity resistance is still a challenge in the field of sensing materials. In this work, a ternary Ag nanoparticles decorated NiCo 2 O 4 /NiO (Ag/NiCo 2 O 4 /NiO) composite with hollow nanocage structure has been successfully obtained, which uses ZIF-67 as a template combined with self-etching method, followed by NaBH 4 reduction of silver ions. For the synergistic effect of the novel morphology, the presence of Ag nanoparticles and hydroxyl absorbent NiO, and the formation of p-p heterojunction between NiCo 2 O 4 and NiO, Ag/NiCo 2 O 4 /NiO exhibits good humidity resistance and high-sensitive to n-butanol. The mesoporous hollow nanocage morphology not only provides abundant adsorption sites for target gases, but also facilitates the diffusion of water molecules. The doping of Ag nanoparticles can regulate the adsorption of oxygen on the surface of gas sensing materials, improving the sensitivity while suppressing the hydroxyl poisoning reaction process. The hydroxyl absorbent NiO in Ag/NiCo 2 O 4 /NiO can both directly absorb water and form p-p heterojunction structure with NiCo 2 O 4 , which improves sensor performance while suppressing hydroxyl poisoning. In the gas sensing tests, the optimal Ag/NiCo 2 O 4 /NiO composites can achieve a high response value of 31.41, as well as rapid response/recovery times (65 s/47 s) to 100 ppm n-butanol at the working temperature of 170 °C. Moreover, it displays a wide detection range (1–120 ppm), a low detection limit (0.27 ppm), excellent selectivity to n-butanol, and superior long term stability (maintaining a response value of 84.68 % after 14 days). Notably, the optimal Ag/NiCo 2 O 4 /NiO demonstrates great humidity-tolerant ability with a response values fluctuation of 16 % under the range of 33 %-80 % relative humidity. This research provides a feasible approach for designing practical gas sensing materials with high sensitivity and moisture resistance.
研究领域:
材料科学
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纳米技术
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气体传感
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化学传感器
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环境监测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Huiling Zhang,Rongrong Yuan,Mengfeifei Jin,Zelong Zhang,Yanxia Yu,Weidong Xiang,Xiaojuan Liang
All-inorganic lead halide quantum dots (QDs) have attracted immense interest because of their excellent photoelectric properties. By virtue of a similar ionic radius and the same valence state, Rb + /Cs + mixed-cation have become a novel mechanism to adjust multi-color emission. However, their poor stability remains a serious problem that has not been solved satisfactorily. Interestingly, QDs glass shows good thermostability and moisture susceptibility. Herein, CsPbBr 3 : x Rb ( x = 0, 0.4, 0.6, 0.8) QD glasses which yield tunable emission spectra (475–523 nm) were synthesized successfully via glass crystallization. Most importantly, the as-prepared QDs glasses exhibited ultrastability under various atmospheric, water and heat conditions. Thus, synthesis of a mixed-cation perovskite QDs glass is a new method to achieve stable multi-color emission. They are also expected to become a new generation of photoelectric materials and can be prospectively applied to light-emitting devices.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zipei Zhang,Liya Zhang,Zeyi Wang,Guozhen Wang,Yunpeng Li,Jingcheng Hao
The presence of water in industrial waste gas has been demonstrated to have a deleterious effect on the adsorption of volatile organic compounds (VOCs) by activated carbon (AC). In this work, superhydrophobic nanosilica particles (HDTMS-NS) were successfully fabricated by the modification of nanosilica particles (NS) with hexadecyltrimethoxysilane (HDTMS) and deposited on the surface of AC by the spraying method. The resultant 30HS/AC demonstrated exceptional selective adsorption of toluene under humid conditions (80 % RH). The superhydrophobicity 30HS/AC (WCA = 162.4°) exhibited an augmented specific surface area and an enhanced toluene adsorption capacity compared to AC. Notably, the toluene adsorption capacity of AC decreased by 47 % when the relative humidity was increased from 0 % to 80 %, while that of 30HS/AC decreased by only 16 %. Grand Canonical Monte Carlo simulation indicate that HDTMS-NS can effectively prevent water from entering the internal pores of HS/AC. This study highlights a simple process to prepare superhydrophobic activated carbon by spraying method, which provides a promising solution for the treatment of VOCs from humid industries.
研究领域:
环境科学
·
材料工程
·
化学吸附
·
工业废气处理
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Wei Tang,Yulan Jian,Mingjun Shao,Yu Cheng,Jing Liu,Yuangui Liu,Dennis W. Hess,Hui Wan,Linkun Xie
The increased application of wood products has raised new demands for chemically modified wood, such as enhanced water resistance and use of nontoxic fluorine-free compounds, but less attention has been paid to such requirements to date. Herein, superhydrophobic wood (SH-Wood) with high water contact angle (> 150°) and low sliding angle (< 10°) was prepared successfully by using liquid-vapor phase deposition of methyltrimethoxysilane (MTMS) combining vacuum-pressure impregnation and chemical vapor deposition methods for the first time. Covalent grafting of methyl groups with low-surface-energy on SH-Wood substrate was confirmed via Fourier-transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). Scanning electron microscopy (SEM) with energy dispersive X-ray scanning (EDS) analyses showed that the cell wall inside the wood was successfully filled by MTMS in situ grafting and a dense polymethylsiloxane protective layer was formed on the surface of SH-Wood. The SH-Wood generated exhibited excellent moisture resistance , a dramatic decrease in the water uptake (WU) from 116.3 % (control) to 23.5 %, and a diminished water vapor absorption (WVA) from 9.5 % compared to control wood (14.3 %). Moreover, the SH-Wood also demonstrated good anti-corrosion, abrasive resistance, mechanical strength and multi-functions of stain-resistance, anti-adhesion and self-cleaning, which will undoubtedly facilitate greatly expanded applications for wood.
研究领域:
材料科学
·
林产化学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Rong Zhao,Dongna Li,Xiaoge Ye,Zhen Li,Xiaojun Ma,Jianing Li
To address the unsustainability and environmental-health risks associated with conventional petroleum-based adhesives, we report a sustainable route to high-performance adhesives via ammonium persulfate (APS)-initiated grafting of alkali lignin (AL), sodium lignosulfonate (SLS), and enzymatic hydrolysis lignin (EHL) onto natural rubber latex (NRL). Grafted formulations show a >50 % increase in lap shear strength, a ≈4 % rise in glass transition temperature (T g , from −62.4 °C to −59.8 °C), and stable adhesion under 70 % relative humidity. Soil burial tests reveal controlled biodegradation (20.6 % vs. 29.2 % mass loss for AL-grafted NRL and pure NRL). Enhanced antioxidant and mold-resistance further underscore lignin's dual reinforcing and stabilizing roles. This versatile platform delivers tunable performance and predictable end-of-life behavior for green packaging and biomedical adhesives.
研究领域:
高分子材料
·
生物材料
·
绿色化学
·
胶体与界面科学
·
环境功能材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Hao Zhong,Jun-Wei Wang,Bin-Bin Dong,Lin Li,Ming-Ye Yang,Jun-Ling Yu,Xu Xin,Simeon Agathopoulos
The red-emitting Sr[LiAl 3 N 4 ]:Eu 2+ (SLA) phosphor was synthesized under flowing N 2 gas. A thin organosilica layer (about 5–10 nm) was coated on the surface of SLA phosphors by a very simple method, which transformed the phosphor surface from hydrophilicity to hydrophobicity . The contact angle of water droplets on the surface of the packed SLA phosphors was more than 140°. Compared with the unmodified sample, the modified SLA phosphors could keep at a high emission intensity for more than twice the time under an extremely high moisture level (at relative humidity of 100%, 85 °C). The hydrophobic modification could also improve the uniform dispersion of phosphors during assembly process of white LED .
研究领域:
材料科学
·
化学
·
光电
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）