CORROSION SCIENCE
·
2022
·
IF 7.72
Longkang Cong,Wei Li,Yao Guo,Jiancheng Wang,Qiang Song,Shengyue Gu,Shouyang Zhang
The calcium magnesium aluminosilicate (CMAS) attack is becoming a critical obstacle to the application of thermal barrier coatings (TBCs). In this work, we prove that Ca 2 La 8 (SiO 4 ) 6 O 2 is an effective TBCs material for resisting CMAS attack, and investigates its CMAS corrosion behaviors. The results indicate that no evidence of chemical reactions was found between CMAS and Ca 2 La 8 (SiO 4 ) 6 O 2 heat-treated at 1300 °C and 1500 °C. The corrosion of apatite by CMAS occurs via dissolution and re-precipitation processes. At 1300 °C, the apatite Ca 2 La 8 (SiO 4 ) 6 O 2 substrates have little evidence of damage. Moreover, the apatite can also effectively block the infiltration of CMAS up to 1500 °C.
研究领域:
材料科学
·
热力学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2018
·
IF 13.709
Dengbao Han,Muhammad Imran,Mengjiao Zhang,Shuai Chang,Xian-gang Wu,Xin Zhang,Jialun Tang,Mingshan Wang,Shmshad Ali,Xinguo Li,Gang Yu,Junbo Han,Lingxue Wang,Bingsuo Zou,Haizheng Zhong
In this paper, we reported the in situ fabrication of highly luminescent formamidinium lead bromide (FAPbBr3) nanocrystal thin films by dropping toluene as an anti-solvent during the spin-coating with a perovskite precursor solution using 3,3-diphenylpropylamine bromide (DPPA-Br) as a ligand. The resulting films are uniform and composed of 5–20 nm FAPbBr3 perovskite nanocrystals. By monitoring the solvent mixing of anti-solvent and precursor solution on the substrates, we illustrated the difference between the ligand-assisted reprecipitation (LARP) process and the nanocrystal-pinning (NCP) process. This understanding provides a guideline for film optimization, and the optimized films obtained through the in situ LARP process exhibit strong photoluminescence emission at 528 nm, with quantum yields up to 78% and an average photoluminescence lifetime of 12.7 ns. In addition, an exciton binding energy of 57.5 meV was derived from the temperature-dependent photoluminescence measurement. More importantly, we achieved highly efficient pure green perovskite based light-emitting diode (PeLEDs) devices with an average external quantum efficiency (EQE) of 7.3% (maximum EQE is 16.3%) and an average current efficiency (CE) of 29.5 cd A–1 (maximum CE is 66.3 cd A–1) by adapting a conventional device structure of ITO/PEDOT:PSS/TFB/perovskite film/TPBi/LiF/Al. It is expected that the in situ LARP process provides an effective methodology for the improvement of the performance of PeLEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 51
·期 5
·2033-2040
·
IF 4.39
Luofu Min,Jingying Duan,Lu Liu,Sheng Ge,Wen Zhang,Yuxin Wang
Layered double hydroxides (LDHs) can play an important role in various areas, but conventional LDHs synthesis often causes product agglomeration and generates plenty of high-salt wastewater, and requires a time-consuming aging process to reach the desired purity and crystalline state. Herein, we report the synthesis of MgAl-LDH, a representative of these kinds of ionic lamellar inorganic solids, with a novel method involving the reaction of magnesium oxide (MgO) with aluminate ions (Al(OH)4−) in a strongly alkaline environment. The formation of MgAl-LDH follows a mechanism of interfacial dissolution–reprecipitation (IDR), i.e., Mg2+ ions released at the interface of dissolved MgO react immediately with Al(OH)4− ions to reprecipitate as MgAl-LDH. The obtained MgAl-LDH has no impurity phases and shows high crystallinity, high specific surface area, and a narrow particle size distribution. Moreover, MgAl-LDH is intercalated with OH− anions, so it can be directly used as a Brønsted base catalyst and ion exchanger. The novel method requires no time-consuming aging process and is highly scalable. It is also shown that a closed-loop synthesis of MgAl-LDH without waste discharge can be achieved with an appropriate Al source, e.g., Al(OH)3, and a recycled NaOH solution.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2011
·
IF 2.138
Chao Zou,Kui Cheng,Wenjian Weng,Chenlu Song,Piyi Du,Ge Shen,Gaorong Han
α-tricalcium phosphate (α-TCP), biphasic α/β-tricalcium phosphate (α/β-TCP) with different two phase ratio and β-tricalcium phosphate (β-TCP) powders were prepared by calcining an amorphous calcium phosphate (ACP) precursor at a temperature ranging from 800 to 900 °C. The microstructural characterization revealed that the particles in the monophasic and the biphasic TCP powders had about 1 μm in size, and agglomerated by 500 nm ones. In comparison with monophasic TCP powders, the dissolution–reprecipitation behaviors of the biphasic TCP powders in an acetate buffer solution with pH 5 were studied. The biphasic TCPs demonstrated a different behavior from the monophasic TCPs, including changes in morphology and crystalline phase. The unique behavior can be tailored by controlling the α-TCP content in the biphasic TCP powders.
研究领域:
材料科学
·
生物医学工程
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yun Tang,Nan Yan,Zhiwei Wang,Hudie Yuan,Yalou Xin,Hongfeng Yin
Ligand-assisted reprecipitation (LARP) technique is a powerful approach for the synthesis of organometal halide perovskite nanocrystals (PNCs). The morphology and surface property of the formed PNCs which determine their optical properties are ultrasensitive to the synthetic parameters. To guarantee the batch-to-batch reproducibility of PNCs with excellent optical properties, it is of central importance to better understand the factors influencing the formation of PNCs during LARP process. Herein the dual-factor of the amount of perovskite precursor and the polarity of mixture solvent was modified by varying precursor solution volume (PSV) in the LARP system. The concentration, size, surface state and optical properties of the synthesized CH 3 NH 3 PbBr 3 PNCs as a function of PSV were systematically investigated aiming to understand the influence of the dual-factor on the nucleation and growth of PNCs. Experimental results revealed that few crystal nuclei was generated due to lower amount of precursor at lower PSV, which was favorable for the growth of large perovskite crystals. At the higher PSV, the inhibition of crystal growth with increased amount of precursor was compensated by increasing the polarity of mixture solvent, which led to the dissolution of surface ligands and eventually growth of large perovskite crystals. The obtained results on PSV-dependent synthesis of PNCs will be used as a guide to optimize the synthetic parameters in the LARP process.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Ya-Wen Zhang,Guan Wu,Hui Dang,Kangzhe Ma,Su Chen
Organometal halide perovskites (such as CH3NH3PbX3, X = Cl, Br, I) have received enormous interest due to their strikingly photoelectric properties. Here we develop a facile ligand-assisted reprecipitation method to synthesize NH2CH═NH2PbX3 (NH2CH═NH2+, FA; X = Br and I) perovskite quantum dots (QDs) at room temperature. The FAPbX3 perovskite QDs with uniform monodispersity (sized 4–7 nm) display relatively high photoluminescence quantum yields (PLQYs) of 60–75%. Through manipulating the mixed-organic-cation reactions, we achieve a series of multicolored perovskite QDs with continuously controllable emission wavelengths from 460 to 565 nm. Furthermore, we discuss the influence of ligands (oleic acid and n-octylamine) on PL properties and stabilities of perovskite QDs. Finally, we have successfully designed a white LED via compositing perovskite QDs and poly(methyl methacrylate) (PMMA), which presents a high color rendering index. Considering those remarkable achievements, we believe our work will have great potential to meet various optoelectronic applications.
研究领域:
材料科学
·
光学工程
·
电子工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xiaozhong Zhou,Zhengfeng Zhang,Xiaofang Lu,Xueyan Lv,Guofu Ma,Qingtao Wang,Ziqiang Lei
Sb2O3 nanoparticles are uniformly anchored on reduced graphene oxide (rGO) sheets via a facile and ecofriendly route based on the alcohol dissolution–reprecipitation method. Such obtained Sb2O3/rGO composite demonstrates a highly reversible specific capacity (1355 mA h g–1 at 100 mA g–1), good rate capability, and superior life cycle (525 mA h g–1 after 700 cycles at 600 mA g–1) when used an anode electrode for lithium-ion batteries (LIBs). The outstanding electrochemical properties of Sb2O3/rGO composite could be attributed to its unique structure in which the strong electronic coupling effect between Sb2O3 and rGO leads to an enhanced electronic conductivity, structure stability, and electrochemical activity during reversible conversion-alloying reactions. Also, these findings are helpful in both developing novel high-performance electrodes for LIBs and synthesizing functional materials in an ecofriendly and economical way.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2020
·
IF 0
Jun-Hua Wei,Xu-Dong Wang,Jin-Feng Liao,Dai-Bin Kuang
Ligand-assisted reprecipitation strategy (LARS) is one of the most popular methods for the fabrication of lead halide perovskite nanocrystals; however, it has always been criticized for poor repeatability and low stability of the resulting nanocrystals. Herein, we demonstrate that liquefying MAPbBr3 single crystals via methylamine (MA) gas rather than being dissolved in N,N-dimethylformamide (DMF) are more beneficial in synthesizing high-quality and stable MAPbX3 (X = Cl, Br, I) based on the LARS. In particular, the liquefied single-crystal-derived MAPbBr3 nanocrystals show a high PLQY exceeding 95%, while 87% for the one derived from the traditional LARS. It is found that replacing DMF solvent with MA gas can not only passivate the MA vacancy defects on the nanocrystal surface but also hinder the formation of halide vacancies, both of which significantly enhance the stability. Benefitting from the impressive PLQY and high X-ray attenuation, MAPbBr3 nanocrystals exhibit strong radioluminescence under X-ray excitation, which further enables their application in large-area X-ray imaging. Furthermore, liquefied perovskite single crystals can be further applied in the in situ synthesis of MAPbX3 nanocrystals within the mesoporous SiO2 template, affording the MAPbX3@SiO2 complex, which exhibits potential as stable solid-state light-emitting diodes.
研究领域:
材料科学
·
纳米技术
·
光电
·
放射学
✓ 已验证
DOI
Small Methods
·
2023
·Vol. 7
·期 10
·2300394
·
IF 12.4
Yuhao Geng,Haoyang Hu,Yongqi Jia,Xintong Huang,Tian Yang,Runzhe Liang,Zhuo Chen,Zhihong Yuan,Jianhong Xu
Lead halide perovskite nanocrystals (LHP NCs) have the characteristics of fast reaction kinetics and crystal instability due to the intrinsically highly ionic bonding between the respective ions, which bring challenges for revealing the growth kinetics and practical applications. Compared with conventional batch synthesis methods, the single-function microreactor can achieve precise and stable control of the NCs synthesis process, but it still has the shortcoming of not being able to obtain information about the growth process. In this study, a micro Total Reaction System (μTRS) with remote control, online detection, and rapid data analysis functions is designed. μTRS can sample the photoluminescence information of CsPbBr 3 NCs growth in ligand-assisted reprecipitation method. CsPbBr 3 NCs with an emission range of 435–492 nm are successfully detected, which breaks the record of the smallest size of CsPbBr 3 NCs synthesized directly from precursors. The real-time feature of μTRS enables the construction of an automated close-loop synthesis system. Besides, the rapid acquisition and timely processing of product information enable the rapid mapping of the operation space for CsPbBr 3 NCs preparation, which provides a reliable and learnable data set for designing a fully autonomous microreaction system capable of synthesizing NCs.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
光电子学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhangyi Huang,Yi Zuo,Jiaochun Zheng,Mao Deng,Ruichong Chen,Haomin Wang
Hydroxyapatite (HA) ceramics have promising applications in various fields, such as medical and waste treatment. However, traditional high-temperature sintering methods suffer from issues like element volatilization and performance degradation. Additionally, HA ceramics prepared using the cold sintering process (CSP), a low-temperature processing technique, often exhibit low density and poor mechanical properties. In this work, HA ceramics were reinforced with 35 mol% SiO 2 . The SiO 2 -HA glass-ceramic, fabricated at 250 °C under 750 MPa pressure with 35 wt% deionized water via CSP, exhibits a high relative density of 92.4 %, a relatively high Vickers hardness of 5.4 GPa, a fracture toughness of 0.62 MPa m 1/2 , and a high compressive strength of 602 MPa. The hardness value of the glass-ceramic is significantly higher than those of HA ceramics prepared by CSP and is comparable to those of well-sintered HA ceramics via conventional high-temperature sintering. Additionally, we summarize the CSP densification mechanism of SiO 2 -HA glass-ceramics, which includes the dissolution-reprecipitation and plastic deformation of SiO 2 and HA, as well as the fracture and rearrangement of HA nanorods.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 26
·8697-8705
·
IF 4.099
Yang Ding,Jie Liu,Ming Zeng,Xishu Wang,Junli Shi,Weili Wang,Yanru Miao,Xibin Yu
Rare earth (RE3+)-doped NaY(MoO4)2 nanocrystals are efficient materials for realizing multicolor emission, which plays an important role in displays, W-LEDs, solar cells and biolabeling. Up to now, research on the multicolor tuning properties of RE3+-doped NaY(MoO4)2 nanoparticles has mostly focused on traditional preparation routes such as the hydrothermal method and sol–gel process. However, the products obtained using these methods are usually large in size (on the micron/submicron scale) and agglomeration problems are inevitable. With the development of nano optoelectronic devices and bioluminescence labeling, there is an urgent need to find an efficient method to prepare nanoscale, monodispersed and NaY(MoO4)2:RE3+ nanocrystals (NCs) with good crystallinity and stronger emission properties. In this work, we demonstrate a simple, fast, reproducible and one-step synthesis of NaY(MoO4)2:Eu3+ NCs with sizes varying from 1–20 nm via a ligand-assisted reprecipitation strategy. The reaction mechanism and emission intensities of NaY(MoO4)2:Eu3+ NCs with various morphologies have been discussed in detail. Furthermore, Tb3+ and Eu3+ ion co-doped NaY(MoO4)2 NCs were also prepared, and various emission colors were obtained and tuned from red, orange-red, yellow and yellow-green to green. Energy transfer between the Tb3+ and Eu3+ ions in the NaY(MoO4)2 host matrix has also been demonstrated. Finally, a highly efficient and stable NaY(MoO4)2:0.05Tb,0.04Eu NC-based W-LED device was built, which indicates the promising future application for this material in the field of lighting. The tunable multicolour emission, ease of preparation and nanosize reveal that NaY(MoO4)2:RE3+ NCs have a potential application in full color displays and W-LEDs.
研究领域:
材料科学
·
纳米技术
·
光学材料
·
无机化学
·
光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 7
·2741-2749
·
IF 3.442
Meng Cheng,Li Wenqi,Ren Chunrong,Zhao Junchuan
Powellite ceramic represents a waste form matrix material to immobilize minor actinides and Mo from reprocessed UMo nuclear fuel. In this paper, the Ca 1−x Li x/2 Gd x/2 MoO 4 (0 ≤ x ≤ 1) series is prepared by solid-state reaction using Gd 3+ as trivalent minor actinide (Cm 3+ ) surrogate, and the structure/microstructure is characterized by XRD, HRTEM, Raman spectroscopy and SEM. Rietveld refinements show that the couple (Gd 3+ and Li + ) enters into the eightfold coordinated Ca site of the powellite structure. With the increase in the contents of Gd and Li, Raman bands broaden due to the distortion of MoO 4 tetrahedra and disordered arrangements of Gd 3+ and Li + . The chemical durability analyzed by the PCT-B indicates that the leaching behaviors of Gd and Mo are related to the interfacial dissolution–reprecipitation mechanism. For the Ca 0.5 Li 0.25 Gd 0.25 MoO 4 ceramic, 7-day NL Gd and NL Mo are shown in the order of ~ 10 −4 and ~ 10 −4 g m −2 , respectively. Thus, our initial results of the structure and chemical durability will provide insights to design new single- or multiphase waste forms for the Mo-rich HLW conditioning.
研究领域:
材料科学
·
核工程
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）