OPTICAL MATERIALS
·
2024
·
IF 3.8
Zifang Xu,Yong Fan,Yan Dai,Xuekai Wang,Shuangyue Hu
A fast response and stability enhanced electrochromic film based on a composite of polyaniline (PANI) with surface functionalized Lanthanum oxide (f-La 2 O 3 ) nanoparticles has been prepared by in-situ polymerization. Scanning electron microscopy (SEM) and Fourier infrared spectroscopy (FTIR) confirmed that La 2 O 3 was attached to the surface of PANI by silane coupling agent. Meanwhile, Electrochemical and electrochromic properties were investigated using cyclic volatammetry, chronoamperommetry, electrochemical impedance spectroscopy (EIS) and UV–vis spectroscopy. Compared with PANI, the f-La 2 O 3 /PANI composite showed excellent electrochromic performance, shorter response time and higher stability. As the mol ratio of La 2 O 3 to aniline was 1:3.5, the composites exhibited best electrochromic behavior with superior coloration efficiency of 22.81 cm 2 C −1 and fastest response time of 1.29 s/1.33 s for bleaching and coloration respectively. The result indicates that introduction of rare earth elements has great potential to improve the electrochromic properties of conducting polymers .
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2024
·
IF 2.4
Yi Hu,Jun Chen,Xinai Liu,Hang Zhong,Jingsong Xu,Jun Chen
To tackle the challenge of non-destructively analyzing complex oxide layers formed by atmospheric corrosion on active metals, we investigate the potential of inverse spatially offset Raman spectroscopy (inverse-SORS) to detect corrosion products and elucidate how the spectroscopic features of SORS vary. This study explores the utilization of inverse-SORS technology for longitudinal structural analysis of opaque CeO 2 /La 2 O 3 laminates, which serve as a proxy for corrosion products. Through a combination of experimental measurements and Monte Carlo simulation, it demonstrates the feasibility of inverse-SORS in non-destructively elucidating the layered structure of these laminates. With increasing the spatial offset of this technology, the Raman intensity ratio of La 2 O 3 -to-CeO 2 increases from 0.23 to 3.2 and then decreases to 0.27 for the CeO 2 /La 2 O 3 sample with a 34-μm-thick CeO 2 layer under 532-nm excitation, whereas the bottom La 2 O 3 layer is hardly detected when the thickness of the upper La 2 O 3 layer increases to 225 μm. The results reveal that a thinner CeO 2 layer facilitates the escape and detection of Raman signals originating from the bottom La 2 O 3 layer, leading to an enhanced La 2 O 3 -to-CeO 2 signal ratio and a reduced offset at the characteristic peak. The research also sheds light on the intricate interplay among multiple variables, such as spatial offset, laser wavelength, the corresponding absorption factor, the thickness of the oxide layer, and the compactness. These insights suggest that SORS is a valuable and non-destructive approach for dissecting the structures of highly turbid composites of metallic compounds and semi-quantitatively deducing their thickness.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2020
·
IF 4.652
Dezhi Wang,Yao Lu,Xinli Liu,Bohua Duan,Zhuangzhi Wu
The secondary phase particles of La 2 O 3 play a crucial role in the determination of the yield strength over MoLa alloys, but few work focuses on their intrinsic modulation of shape and size. Herein, a nanostructuring strategy of the secondary phase particles is proposed to enhance the mechanical performances of MoLa alloys, in which the shape and size effects of secondary phase particles have been discussed. Moreover, the strengthening mechanism is also analyzed. It is found that the La 2 O 3 nanospheres with a small size of 84 nm exhibit the best strengthening ability, leading to a high yield strength of 765 MPa in the sintered state. Smaller particles are easily involved into the Mo matrix interior to be intragranular, which are beneficial for the further strengthening. The strengthening contributions are quantitatively calculated, providing a predicted yield strength value, which is in good agreement with the measured one.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Zhiyuan Liang,Jun Fan,Yue Sun,Yan Liu,Weisheng Zheng
Fluoride contamination from industrial discharge poses severe threats to environmental and human health. This urges a requirement for development of adsorbents with higher efficiency and better selectivity. In this study, lanthanum (La) hydroxide was in-situ deposited onto a magnetic polyacrylic anionic resin (NDMP) to synthesize a novel nanocomposite adsorbent (La-NDMP). La-NDMP exhibited maximum fluoride adsorption capacity at pH 3.0, with negligible La leaching at higher pH levels. The adsorption process followed pseudo-first-order kinetics, and the equilibrium data were well described by the Langmuir isotherm model. Importantly, the incorporation of La enhanced fluoride selectivity by resisting interference from competing anions. The adsorption mechanism involves electrostatic interactions between quaternary ammonium groups on the magnetic resin and fluoride ions, as well as the formation of inner-sphere La-F complexes. Experiments using actual wastewater confirmed that La-NDMP exhibited facile solid-liquid separation, high adsorption efficiency, and stable performance, highlighting its potential for industrial applications.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Danfeng Deng,Wenjing Song,Weizuo Li,Qiang Li,Xin Wang
A composite metal-organic frameworks (MOFs) structure, designated as Co-hmta@La-salen, was synthesized through coordination interactions between a one-dimensional lanthanum MOFs (La-salen) with high density of uncoordinated imine (–CH=N–) groups and a cobalt-based MOFs (Co-hmta) structure prepared using hydrogen bonding stacking with hexamethylenetetramine (hmta) as the organic ligand. Subsequently, the Co-hmta@La-salen composite was chosen as a template for the pyrolysis process to synthesize a La(OH) 3 supported metallic Co catalyst incorporating carbon-nitrogen (Co/La(OH) 3 -CN-hmta) catalyst. The catalytic results show that Co/La(OH) 3 -CN-hmta (54% and 46% selectivity for aniline and N-phenylbenzylamine, respectively) displays superior cascade performance compared to classic Co/La(OH) 3 -CN-nit catalyst (69% and 31% selectivity for aniline and N-phenylbenzylamine, respectively). Moreover, the kinetic test results indicate that N-alkylation is the rate-limiting step of the overall cascade reaction. The Co/La(OH) 3 -CN-hmta catalyst can be separated from the reaction system using a magnet, and it also exhibits good cyclic stability. All of these suggest that the “MOFs plus MOFs via coordination” templating method can be employed as an efficient strategy for the preparation of supported catalysts.
研究领域:
化学
·
催化材料科学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2017
·
IF 6.942
Liping Fang,Ru Liu,Ji Li,Cuihong Xu,Li-Zhi Huang,Dongsheng Wang
An effective approach for eutrophication control and phosphate recovery remains a longstanding challenge. Herein, we present a new technique for phosphate sequestration in lake and phosphate recovery using novel magnetically recoverable magnetite/lanthanum hydroxide [M-La(OH) 3 ] hybrids that can be prepared using a simple one-pot synthesis method. Batch studies show that M-La(OH) 3 exhibits a strong sorption towards phosphate with sorption capacities of up to 52.7 mg-P/g at pH 7.0 in water. A simple model indicates that the efficiency of M-La(OH) 3 for phosphate sequestration in lake is significantly attenuated by 34–45% compared to that in water, due to interference from sediment particles. However, our results demonstrate that sediments suspensions mixed with a M-La(OH) 3 content of 1–3% exhibit a capability of up to 1.2 mg-P/g for sequestering external phosphate compared with that of 0.2 mg-P/g for pristine sediment at pH 7.3. M-La(OH) 3 -mixed sediment suspensions appear to effectively sequester phosphate over an environmentally relevant pH range from 4 to 8.5. Phosphorus (P) fractionation experiments indicate that the enhanced phosphate sorption by M-La(OH) 3 -mixed sediment suspensions is mainly due to the increased fractions of NaOH-P and inorganic P. This work indicates that the M-La(OH) 3 has the potential for phosphate sequestration and recovery from lake.
研究领域:
环境科学
·
水体富营养化控制
·
环境功能材料
·
污染生态学
·
资源回收
✓ 已验证
DOI
高影响因子
FUEL
·
2016
·
IF 3.611
Dongjing Liu,Weiguo Zhou,Jiang Wu
The high-temperature H 2 S removal was conducted over x La y Cu/ZSM-5 sorbents prepared via citric acid method. The sorbents showed good desulphurization performance, the maximal sulfur capacity of 2240.5 μmol S/g over 5La5Cu/ZSM-5 was achieved at 700 °C. The presence of H 2 obviously shortened the breakthrough time and reduced the sulfur capacity. However, the presence of CO had little influence on the desulphurization behavior. The sulfidation activity of La 2 O 3 can be significantly enhanced by introduction of Cu due to the intimate mixing of La 2 O 3 and CuO, the formation of La 2 CuO 4 compound.
研究领域:
材料科学
·
环境化学
·
能源工程
·
催化化学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2023
·
IF 3
Ensi Cao,Yixuan Zhang,Yongjia Zhang,Wentao Hao,Bing Sun,Li Sun
To enhance the acetone sensing capabilities of LaFeO 3 nanoparticles for practical applications in breath analysis, commercial n-type rutile TiO 2 nanoparticles were utilized as additives and directly mixed with LaFeO 3 nanoparticles synthesized via a sol–gel method. The obtained TiO 2 -LaFeO 3 nanocomposites were characterized by XRD, SEM, BET, and XPS. Compared to pure LaFeO 3 nanoparticles, the resulting TiO 2 -LaFeO 3 nanocomposites exhibited higher surface reactivity, as evidenced by their larger specific surface areas and higher oxygen vacancy contents. The introduction of TiO 2 also facilitated the formation of p-n heterojunctions, which enhanced the regulation of acetone molecules on internal carrier conduction within the nanocomposites. Therefore, the TiO 2 -LaFeO 3 nanocomposites demonstrated improved acetone sensing performance, including higher vapor response values, selectivity, and faster response/recovery speeds. Among the series of nanocomposites, those with an addition of 10 wt% TiO 2 exhibited the highest vapor response value (37.3 to 100 ppm) and the greatest selectivity against methanol and ethylene glycol at the prime operating temperature of 144 °C.
研究领域:
材料科学
·
纳米技术
·
传感器
·
表面化学
·
呼吸分析
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Jinyu Bao,Xintao Jiang,Lingzhi Huang,Wei Quan,Chenxu Zhang,Yanan Wang,Haibo Wang,Yi Zeng,Weijin Zhang,Yongxiang Ma,Shansheng Yu,Xiaoying Hu,Hongwei Tian
Interfacial design and the co-catalyst effect are considered to be effective to achieve separation and transport of photogenerated carriers in composite photocatalysts . In this study, a Z-scheme heterojunction was successfully combined with a co-catalyst to achieve a highly efficient LaNiO 3 /g-C 3 N 4 /MoS 2 photocatalyst. MoS 2 flakes were loaded on a hybrid material surface, which was formed by LaNiO 3 nanocubes embedded on layered g-C 3 N 4 , and a good heterostructure with multiple attachment sites was obtained. Experimental studies confirmed that the Z-scheme heterojunction completely preserves the strong redox ability of the photogenerated electrons and holes. As a cocatalyst, MoS 2 further promoted interfacial charge separation and transport. The synergistic effect of the Z-scheme heterojunction and co-catalyst effectively realized the transfer of photogenerated carriers from “slow transfer” to “high transfer” and promoted water decomposition and pollutant degradation. Results revealed that under simulated sunlight irradiation, LaNiO 3 /g-C 3 N 4 /MoS 2 composites exhibit superior hydrogen evolution of 45.1 μmol h −1 , which is 19.1 times that of g-C 3 N 4 and 4.9 times that of LaNiO 3 /g-C 3 N 4 , respectively. Moreover, the LaNiO 3 /g-C 3 N 4 /MoS 2 Z-scheme photocatalyst exhibited excellent photocatalytic performance for antibiotic degradation and heavy-metal ion reduction under visible light . This study might provide some insights into the development of photocatalysts for solar energy conversion and environmental remediation.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 20
·8314-8320
·
IF 1.938
Zhuo Guo,Yin Lu,Jian Li,Xian-feng Xu,Guo-qing Huang,Ze-yu Wang
A nano-complex of graphene and La(OH)3 nanowires (GR–La(OH)3) was prepared for the fabrication of a voltammetric sensor, which was used to simultaneously determine the two isomers of dihydroxybenzene, hydroquinone (HQ) and catechol (CC). The modified electrode exhibited excellent sensitivity and selectivity in the determination of HQ and CC mixed in a 0.1 M Na2HPO4–C4H2O7 buffer solution (pH 4.0). Both HQ and CC appear to be a pair of quasi-reversible redox peaks and the potential difference between oxidation peaks of HQ and CC was 112 mV. Under the optimized conditions, the oxidation peak current of both HQ and CC was linear in the range of 5 to 300 μM in the presence of 50 μM of the other one in the solution. The detection limit was found to be 0.015 μM for HQ and 0.01 μM for CC (S/N = 3). The proposed method was further successfully applied to the simultaneous determination of HQ and CC in artificial wastewater samples, and the results showed good stability and high reproducibility.
研究领域:
分析化学
·
环境监测
·
电化学
·
纳米材料
·
传感器技术
✓ 已验证
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2016
·Vol. 33
·期 6
·1837-1845
·
IF 1.408
Liu Dongjing,Zhou Weiguo,Wu Jiang
Performance of CeO 2 -La 2 O 3 /ZSM-5 sorbents for sulfur removal was examined at temperature ranging from 500 oC to 700 oC. The sulfur capacity of 5Ce5La/ZSM-5 was much bigger than that of CeO 2 /ZSM-5. H 2 had a negative impact on the sulfidation; however, CO had little influence on sulfur removal. The characterization results showed that CeO 2 and La 2 O 3 were well dispersed on ZSM-5 because of the intimate admixing of La 2 O 3 and CeO 2 , the major sulfidation products were Ce 2 O 2 S and La 2 O 2 S, the XRD and SEM results revealed that ZSM-5 structure could remain intact during preparation and sulfidation process, the H 2 -TPR showed that the reducibility of CeO 2 can be remarkably enhanced by addition of La.
研究领域:
材料科学
·
环境化学
·
催化化学
·
能源工程
·
无机功能材料
·
气体净化
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shuwei Yao,Xiaxue Zhang,Yunzhu Ma,Wensheng Liu,Juan Wang
Alumina nanofibers have garnered significant attention in high-temperature applications due to their excellent mechanical properties and chemical stability. However, under high-temperature conditions, grain coarsening in alumina nanofibers can lead to structural degradation, resulting in a rapid decline in mechanical performance. To obtain alumina nanofibers with enhanced thermal stability, samples were fabricated via electrospinning combined with the sol-gel method. The combined effects of fiber diameter and La 2 O 3 content on the microstructure and its evolution under high-temperature conditions were systematically investigated. The study revealed that the incorporation of 1-10 wt.% La 2 O 3 influenced the phase transformation and high-temperature grain growth behavior of alumina nanofibers. An appropriate amount of La 2 O 3 significantly enhanced the thermal stability of the fibers. For nanofibers with identical composition, a size effect on thermal stability was observed: smaller fiber diameters corresponded to higher stability. At elevated temperatures, fibers with diameters below 100 nm effectively inhibited abnormal grain growth. After being held at 1200 °C for 1 h, the nanofibers with 5 wt.% La 2 O 3 maintained a fine-grained microstructure without noticeable degradation.
✓ 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）