COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Bo Li,Rui Shi,Zhongzhi Wang,Xin Qiao,Leijun Shen,Liqun Shi
Rare earth luminescent complexes encounter defects such as poor thermal stability, poor dispersibility, and easy quenching of fluorescence emission by water in practical applications. To improve these defects, we innovatively propose using polyhedral oligomeric silsesquioxane (POSS) to enhance the performance of rare earth complexes. We designed and prepared POSS-MAA-EuL composite materials. POSS is modified with long chains containing -COOH functional groups, allowing it to bind with rare earth complexes through coordination interactions. Experimental results have shown that the combination of POSS not only improves the dispersibility of rare earth complexes, but also enhances their thermal stability. It is worth noting that the binding of POSS endows rare earth complexes with the ability of resisting fluorescence emission quenching by water. When the same volume of deionized water is added (2000 μL), the fluorescence of rare earth complex is almost completely quenched, with a quenching efficiency of 99.0 %, while the quenching efficiency of POSS-MAA-EuL is only 39.2 %. There are few reports on improving the water quenching resistance of rare earth luminescent complexes by combining with POSS. Therefore, this work provides a new way to improve the performance of rare earth complexes.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Linqiao Qin,Lin Shao,Min Yi,Yu She,Yu Liu,Wenwen Chen,Yuxiao Jiang,Kaituo Wang
Tetracycline hydrochloride (TC) is currently treated mostly with photocatalysts that the preparation process is complicated and costly, limiting its large-scale application. In this study, slag-based geopolymer microspheres (SGMs) photocatalysts were prepared from low-cost slag as raw material using geopolymer technology, and excellent visible-light degradation properties for TC could be obtained by simple calcination. When the water addition was 4 g, the stirring speed was 1000 rpm and the calcination temperature was 800 °C for 3 h, the initial pH was 4.72 and the photocatalyst dosage was 0.4 g/L, SGMs showed excellent photocatalytic performance for TC with 94.76 % degradation in visible-light. Compared with the traditional powder materials, SGMs can achieve rapid separation with excellent settling performance (it can be completely settled within 1 min). With degradation rate remaining over 90 % after five cycles, it showed excellent cyclic stability. The degradation mechanism of SGMs on TC was as follows: firstly, TC adsorption takes place on the SGMs surface during the dark reaction stage; secondly, with Ca 2+ in the SGMs enter the solution, it complexed with the TC, making it positively charged and accelerating the generation of free radicals, adsorption and degradation occurred simultaneously, with the order of active free radical action on TC degradation being ·O 2 - >·OH > h + . The SGMs prepared in this project has the benefits of being inexpensive, easy to operate, environmental protection, excellent visible-light photocatalyst performance, and potential industrial application prospects.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Chunmei Yan,Xiao He,Bo Yu,Bo Zhou,Shaofan Fang,Jia Xu,Bin Liu,Zhaofeng Wang
Robust and biocompatible hydrogels are recognized as promising biomimetic soft materials to improve human life quality. To ensure their stable, reliable, and safe service, the hydrogels are further required to have non-contact and wireless stress sensing ability. Herein, a mechanoluminescence (ML) based micellar hydrogel is developed, in which the surface-modified BaSi 2 O 2 N 2 : Eu 2+ (M-BSON) particles are chemically incorporated into the cross-linked polyacrylamide/polymethyl acrylate (PAM/PMA) network structure. Because of the interactions between the M-BSON particles and the PMA micelles, the as-fabricated composite hydrogel exhibits enhanced mechanical properties with a mechanical strength of 2.73 MPa and a toughness of 3.40 MJ m −3 , respectively. The chemical wrapping of the M-BSON particles by the hydrophobic PMA micelles further protects the ML properties from water quenching, leading to remarkable stress-induced luminescence under the water environment of hydrogel. Because of its desirable mechanical performance, attractive stress-light responsiveness, and good biocompatibility, the M-BSON incorporated hydrogel has the potential to be applied as an intelligent artificial ligament for stress self-monitoring and failure warning. This work addresses the inhomogeneous dispersion and water quenching issues of the ML particles in hydrogel structure, which significantly promote ML applications in bionic engineering.
研究领域:
材料科学
·
生物医学工程
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Qizheng Dong,Yuanyuan Wang,Xueyou Zhu,Ling He
Ca 2+ and Tm 3+ co-doped CsPbBr 3 @glass composites were successfully synthesized through the high-temperature melting-water quenching-heat treatment method. Enhancement of optical performance is achieved through dual doping, harnessing simultaneous influences from both the glass structure and the inherent structure of CsPbBr 3 quantum dots (QDs). The presence of Ca 2+ in the glass reduces its viscosity and enhances the precipitation of QD crystals. Concurrently, the incorporation of Tm 3+ leads to the control of dimensions and band gaps, reduction in V Br defects, and the potential creation of energy transfer pathways, thereby effectively improving the optical performance of QDs. Simultaneous co-doping with Ca 2+ circumvents the drawback of low crystallinity observed in singly Tm 3+ -doped CsPbBr 3 QDs. In contrast to the undoped sample, the photoluminescence (PL) intensity of the optimized sample demonstrated a significant increase of 128 %. The photoluminescence quantum yield (PLQY) also experienced a rise from 18 % to 55 %, while the fluorescence lifetime extended from 68 ns to 107 ns. Furthermore, the encapsulation of the borosilicate glass matrix has been shown to greatly improve the time, water, thermal, and photostability of CsPbBr 3 QDs. These remarkable properties position the Ca 2+ and Tm 3+ co-doped CsPbBr 3 QDs@glass composites as ideal materials for illumination and wide-color-gamut displays.
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
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yongchao Fang,Xiufang Cui,Chao Yan,Zhuo Chen,Yongzhi Jing,Xin Wen,Guo Jin,Haoliang Tian
In this study, a La 0.8 Ba 0.2 TiO 3− δ (LBT) upper layer was deposited on an yttria-stabilized zirconia (YSZ) thermal barrier coating (TBC) through atmospheric plasma spraying . The thermal cycling behaviors of the YSZ single-ceramic-layer and LBT–YSZ double-ceramic-layer coatings at 1000 °C were investigated through a water quenching method. Moreover, phases, microstructural evolution , and elemental distributions were studied through by X-ray diffraction and scanning electron microscopy–energy-dispersive X-ray spectroscopy. The results showed that the thermal cycling lifetime of the LBT–YSZ coating was 27% higher than that of conventional YSZ coating. The conventional YSZ coating failed after 251 cycles because of the joining of the continuous horizontal and vertical cracks caused by the formation of thermal growth oxides and the bending effect of the single-ceramic-layer structure. The thermal cycling behavior of the LBT–YSZ coating was different from that of the YSZ coating at the edge and center. Although the former was similar to the failure behavior of the YSZ coating, the cracks in the vertical direction were deflected as a result of the bending effect of the double-ceramic-layer structure during quenching. This deflection led to the formation of slope cracks with longer propagation paths and slope spallation zones. The latter showed small-debris spallation on top of the LBT upper layer due to the lower fracture toughness of the LBT, which protected the central coating from the structural damage of the ceramic coating . These two behaviors would either release the thermal stress or increase the crack-propagation energy requirement in the ceramic coating, consequently improving the thermal cycling lifetime of the LBT–YSZ coating. In summary, depositing an LBT upper layer could potentially improve the thermal cycling lifetimes of TBCs.
研究领域:
材料科学
·
涂层与薄膜
·
热工程
·
表面工程
✓ 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）