ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Yong’an Tang,Jun Hu,Ahmed H. Elmenoufy,Xiangliang Yang
Photodynamic therapy (PDT) for deep-seated tumor is largely impeded by the limited penetration depth of excitation light in tissue. X-ray is considered as an ideal energy source to activate photosensitizers (PSs) located deep within the body with the assistance of scintillating nanoparticles (ScNPs). However, the efficacy under this concept is not satisfying due to the low scintillating luminescence and weak energy transfer from ScNPs to PSs. Here, mesoporous LaF3:Tb ScNPs were successfully synthesized by a facile hydrothermal process to act as PS carriers and X-ray energy transducers, owing to their good ionizing radiation stopping power and high luminescence efficiency. The formation mechanism of porous structure was elucidated in detail with classical crystallization theory. After a systematic investigation, LaF3:Tb ScNPs with optimized scintillating luminescence were obtained for loading Rose Bengal (RB) to establish an efficient FRET system, owing to their excellent spectral match. The FRET efficiency between ScNPs and RB was calculated to be as high as 85%. Under irradiation, enhanced 1O2 generation induced by LaF3:Tb-RB nanocomposites via FRET process was detected. This LaF3:Tb-RB FRET system shows great potential to be applied in X-ray stimulated PDT for deep-seated tumors in the future.
研究领域:
肿瘤学
·
纳米医学
·
光动力治疗
·
分子影像
·
放射化学
·
生物材料
·
转化医学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2014
·Vol. 6
·期 24
·14799-14809
·
IF 6.739
Ruichan Lv,Guixin Yang,Fei He,Yunlu Dai,Shili Gai,Piaoping Yang
In this report, uniform LaF3:Ln mesoporous spheres have been synthesized by a facile and mild in situ ion-exchange method using yolk-like La(OH)3:Ln mesoporous spheres as templates, which were prepared through a self-produced bubble-template route. It was found that the structures of the final LaF3:Ln can simply be tuned by adding a polyetherimide (PEI) reagent. LaF3:Ln hollow mesoporous spheres (HMSs) and LaF3:Ln flower-like mesoporous spheres (FMSs) were obtained when assisted by PEI and in the absence of PEI. The up-conversion (UC) luminescence results reveal that the doping of Nd3+ ions in LaF3:Ln can markedly influence the UC emissions of the products. It is interesting that an obvious thermal effect is achieved due to the energy back-transfer from Tm3+ to Nd3+ ions under 980 nm near-infrared (NIR) irradiation. The LaF3:Yb/Er/Tm/Nd HMSs show good biocompatibility and sustained doxorubicin (DOX) release properties. In particular, upon 980 nm NIR irradiation, the photothermal effect arising from the Nd3+ doping induces a faster DOX release from the drug release system. Moreover, UC luminescence images of LaF3:Yb/Er/Tm/Nd HMSs uptaken by MCF-7 cells exhibit apparent green emission under 980 nm NIR irradiation. Such a multifunctional carrier combining UC luminescence and hyperthermia with the chemotherapeutic drugs should be of high potential for the simultaneous anti-cancer therapy and cell imaging.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
癌症治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2014
·Vol. 14
·期 5
·3677-3682
·
IF 1.339
Li S. Wen,Ren H. Juan,Ju S. Guang
The LaF3 nanoparticles doped with different concentration Eu3+ ions are prepared by a simple and low temperature synthetic route. The nanoparticles with the size of about 3.5 nm are roughly spherical and monodisperse. The emission of Eu3+ ions is sensitized
through pyromellitic acid bonded onto the surface of nanoparticles. The structure, morphology, photoluminescence properties and fluorescence dynamics are studied systemically. The results show that the sensitized nanoparticles have a broad absorption band in the UV domain and high asymmetry
radio, and enhanced Eu3+ luminescence by “antenna effect” of ligands. The excited state lifetimes of sensitized nanoparticles are longer than those of un-sensitized nanoparticles and corresponding europium complexes.
研究领域:
材料科学
·
纳米技术
·
光物理
·
发光材料
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Xuyang Zhang,Jingbo Yu,Lili Hu,Jinjun Ren
LaF3 and NaLaF4 crystals were selectively precipitated in the SiO2–Al2O3–AlF3–Na2O–NaF–LaF3–ErF3 glass system by adjusting their compositions. The structural evolution at the atomic level driven by heat treatment and glass compositions was studied using the state-of-the-art magic-angle spinning nuclear magnetic resonance technique. From a comprehensive local structural study, we found that LaF3 and NaLaF4 crystals compete in crystallization in these glasses. The crystallization ability of NaLaF4 increases with the increase of the content of Na+ ions within the F-enriched phase, but for LaF3 crystals, it is reverse. These two crystals can be selectively precipitated in the glasses by adjusting the content of these Na+ ions within the F-enriched phase. When the crystallization ability of these two crystals becomes similar, none of them can be precipitated due to their mutual interference in crystallization. Intense single green upconversion luminescence occurs in glasses precipitating LaF3 or NaLaF4 crystals. The underlying relationship between compositions, structures, crystallization, and upconversion luminescence properties is unearthed based on the structural evolution, crystallization mechanism, and luminescence properties. This relationship will facilitate the compositional design of these kinds of glasses. It is inferred that it will be better to precipitate LaF3 rather than NaLaF4 crystals for achieving highly efficient upconversion luminescence.
研究领域:
材料科学
·
光物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Yanran Wang,Chunxia Huang,Yufei Wang,Tianyou Chen,Jing Wu
In this paper, cerium-doped LaF 3 nanoparticles (LaF 3 :Ce NPs) were synthesized and applied in enhancing chemiluminescence (CL) process of NaIO 4 –H 2 O 2 system. The CL intensity was enhanced 42 times compared to that of NaIO 4 –H 2 O 2 system without LaF 3 :Ce NPs. The CL mechanism was systematically investigated and accounted by the annihilation between electron-injected and hole-injected LaF 3 :Ce NPs. Experimental conditions were optimized to obtain the optimum CL. This work introduced a new pathway for enhancing traditional luminescent process through developing advanced nanomaterials .
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Sikai Wang,Minghui Kang,Xiaoxin Zheng,Xusheng Qiao,Ci Wang,Lu Liu,Jing Ren,Jianzhong Zhang
Controllable growth of nanocrystals (NCs) in optical glasses is essential to impart photonic functions for demanded applications. Here, Ce 3+ -doped KLaF 4 and LaF 3 fluoride NCs are controllably precipitated in a fluorosilicate glass via adjusting the duration and temperature of thermal treatment. The presence of phase separation in the precursor glass (PG) is derived from molecular dynamics (MD) simulations, and serves as the driving factor for the crystallization of fluoride NCs. The phase separation of PG, NCs distribution, microscopic morphology and particle size of NCs precipitated in the nano-glass composites (nano-GCs) are investigated by analytical transmission electron microscopy (TEM). Structural and spectroscopic characterizations confirm the influence of the thermal treatment on the crystalline species in the nano-GCs. The developed nano-GCs exhibit intense X-ray excited luminescence with an excellent linearity with the X-ray dosage and a good thermal stability, making them suitable for radiation detection and medical imaging applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2016
·Vol. 3
·期 4
·045010
·
IF 0.968
Ting Fan,Jiantao Lü,Futian Lin,Zifan Zhou
Improved red emission in polyvinylpyrrolidone (PVP)-coated hollow LaF3:Eu3+ nanoparticles by introducing Li+ ions was found for the first time via a one-step template-free hydrothermal method. The hollow formation can be attributed to self-recrystallization and a local Ostwald ripening thermodynamic process. Pores were clearly seen and widely distributed in all LaF3 nanoparticles. The introduction of Li+ ions did not introduce new crystalline phases and resulted in little change in size and morphology of the LaF3 nanoparticles. The main diffraction peaks were found to shift slightly with the Li+ doping concentrations, which indicates that Li+ changes the crystal field environment of Eu3+. The excitation and red emission intensity both doubled when codoped with 7 mol% Li+ ions. The widely distributed pores and improved luminescence properties of our nanoparticles facilitated the construction of new nanocomposites for novel biological applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Honge Wu,Guang Tao Fei,Jiangang Gao,Jianyong Huang,Li De Zhang
White light-emitting diodes (W-LEDs) are an important solid-state lighting source, thanks to their superior properties. Here, a single-phase phosphor composed of organic–inorganic hybrid nanoparticles having a potential application in W-LEDs is successfully prepared. Green facile hydrothermal synthesis is used to obtain the phosphor integrated LaF3:Pr3+ with inexpensive sodium dodecyl benzene sulfonate (SDBS). It emits bright white light excited by ultraviolet (UV, λ = 365 nm) light. Moreover, its color coordinates and temperature are (0.365, 0.412) and 4606 K, respectively, according to the Commission Internationale de L’Eclairage (CIE). Meanwhile, phosphor shows good thermal stability and long photoluminescence decay time. Therefore, it would be a potential material for warm-white lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 10
·8701-8709
·
IF 2.324
Ali Mohamed A.,Liu Xiaofeng,Qiu Jianrong
Greater enhancement in upconversion (UC) luminescence was observed in the glass–ceramics (GCs) containing CaF 2 :Yb 3+ , Er 3+ nanocrystals (NCs) compared with whose doped with LaF 3 :Yb 3+ , Er 3+ NCs prepared by conventional melt-quenching technique followed by successive heat treatment. Our joint experimental and theoretical studies suggest the lager enhancement of UC emission in CaF 2 –GCs rather than of LaF 3 –GCs is associated with the difference in the microstructures, the crystal size, the local coordination environment around rare earth (RE) ions as well as the structural rigidity in the silicate region of the GCs. In addition, it was found that a more symmetric ligand field around RE ions in a smaller size crystal which distributed more homogeneously within the highest ordering silicate region favors stronger UC emission by facilitating the energy transfer process and minimizing the rate of non-radiative relaxation process. Our results may enrich our understanding about UC process in oxyfluoride GCs and provide a general picture for the photophysical processes that contribute to the UC in similar GCs systems.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 12
·17560-17569
·
IF 4.527
Jing Hu,Qi Li,Jianliang Xie,Peng Liu,Shaoliang Jiang,Xin Wang,Liangjun Yin,Li Zhang,Haipeng Lu,Linbo Zhang,Longjiang Deng
The high-temperature applications of zirconium diboride (ZrB 2 ) ceramics are hindered due to their easy initial oxidation at temperature around 700 °C. Although mixing and coating methods have been introduced to enhance the oxidation resistance of ZrB 2 -based ceramics, their thorough comparative analysis still demands a more systematic exploration. Herein, spark plasma sintered ZrB 2 @20 vol% LaF 3 and ZrB 2 +20 vol% LaF 3 ceramics prepared by coating and mixing powders, respectively, were used to study the influence of dispersion method of LaF 3 on their oxidation resistance. After oxidation at 1000 °C for 4 h, a thin oxide layer (~25 μm) and low weight gain (9%) confirmed the superior oxidation resistance of ZrB 2 +20 vol% LaF 3 over ZrB 2 @20 vol% LaF 3 , which could be attributed to the formation of a dense surface layer due to the self-healing mechanism. In turn, the poor oxidation resistance of ZrB 2 @20 vol% LaF 3 was caused by the “anchoring” of LaF 3 cladding layer and locally-coated ZrB 2 particles, which led to the in situ reactions and formation of a porous oxide scale (~400 μm). Finally, the discrepant oxidation resistance mechanisms of ZrB 2 –LaF 3 ceramics obtained by different dispersion methods of LaF 3 were proposed.
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Jing Hu,Peng Liu,Qi Li,Jianliang Xie,Shaoliang Jiang,Xianyu Jiang,Xin Wang,Li Zhang,Liangjun Yin,Haipeng Lu,Longjiang Deng
Good oxidation resistance of ZrB 2 -based coatings is highly desirable for successful high-temperature applications in thermal protection systems. Herein, ZrB 2 -LaF 3 coatings with different microstructure and morphology were prepared by high-enthalpy atmospheric plasma spraying . Particular attention was paid to the effect of spraying power on the physical properties and oxidation resistance of as-sprayed coatings. According to a thorough analysis, spraying power exerts influence on the melting degree and travelling speed of ZrB 2 -LaF 3 agglomerates in the flame during spraying process, thus affecting the microstructure, micro-topography and porosity/density of the coatings, and conclusively, leading to the difference of oxidation resistance . The coatings produced by the lower spraying powers (35 and 55 kW) revealed poor quality and the high degree of porosity with a large number of unmolten particles. Furthermore, these underwent severe oxidation due to the diffusion of oxygen through the pores. On the other hand, the use of excessive power (95 kW) deteriorated the quality of the coating due to drastic residual stress. In turn, the moderate spraying power (75 kW) was found to be optimum for achieving the coating with desirable characteristics, namely, fully molten particles at low porosity and residual stress, being thus beneficial for improving its oxidation resistance. This discovery is therefore beneficial for the practical applications of ZrB 2 -LaF 3 coatings.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 47
·期 7
·9504-9512
·
IF 3.83
Jing Hu,Jianliang Xie,Xianyu Jiang,Qi Li,Xin Wang,Li Zhang,Liangjun Yin,Longjiang Deng
ZrB 2 -based ceramics are important materials for a variety of applications. However, their low oxidation resistance above 1000 °C limits their high-temperature applications. Herein, we report the utilization of LaF 3 as a unique oxidation retardant to significantly improve the oxidation resistance of ZrB 2 -10 vol%LaF 3 ceramics in the temperature range of 1000–1400 °C. Moreover, we present the densification of the oxide layer via oxidation-induced self-healing mechanism of ZrB 2 –LaF 3 ceramics for the first time. The incorporation of LaF 3 into ZrB 2 matrix was achieved by using spark plasma sintering at 1800 °C. Furthermore, the oxidation behavior of pure ZrB 2 and ZrB 2 -10 vol%LaF 3 ceramics was systematically investigated by analyzing the thicknesses of oxide layers and the weight gains. Both the thicknesses and weight gain were significantly reduced after adding 10 vol. % LaF 3 , which can be mainly attributed to the synergistic influence of pore filling and healing by LaB 3 O 6 /LaBO 3 phases and corresponding volumetric expansions.
✓ 已验证
DOI
高影响因子
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