Article
Chemistry, Inorganic & Nuclear
Peng Lin, Junpeng Shi, Lin Liu, Yile Kang, Liang Song, Maochun Hong, Yun Zhang
Summary: In this study, a series of dual-emissive phosphors were prepared by doping Tb3+ and Bi3+ ions, resulting in a significant increase in the long persistent luminescence intensity compared to the host material Zn2GeO4. The photoluminescence color was adjusted by trap depth engineering, while the persistent luminescence color remained green, and the photoluminescence color under 365 nm UV excitation turned yellow. The dual-emission phosphors were successfully applied in multi-stimulus anti-counterfeiting and the detection of mucin 1 with a wide linear range and low detection limit.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Materials Science, Multidisciplinary
Artem A. Bakal, Polina A. Demina, Anna M. Abramova, Gleb B. Sukhorukov, Irina Yu Goryacheva
Summary: This paper presents a novel synthesis method for luminescent-magnetic composite structures containing carbon nanomaterial and magnetite nanoparticles. The process involves steps such as magnetite nanoparticle synthesis, silica shell protection, freezing-induced loading into CaCO3 microparticle pores with pre-loaded dextransulfate, thermal treatment, and matrix dissolving. The obtained composite structures are characterized using various techniques and their movement in a non-uniform magnetic field is studied. The bifunctional nanostructures demonstrate both luminescent and magnetic properties.
Article
Chemistry, Inorganic & Nuclear
Guixian Li, Yu Xue, Qinan Mao, Lang Pei, Hong He, Meijiao Liu, Liang Chu, Jiasong Zhong
Summary: Luminescent thermometers provide a non-contact method of probing temperature with high sensitivity and response speed at the nanoscale. By co-doping the highly temperature-sensitive Mn4+ and less-sensitive Eu3+ (or Sm3+) activators into a Ca2GdSbO6 matrix, an effective thermometer is formed.
DALTON TRANSACTIONS
(2022)
Article
Nanoscience & Nanotechnology
Takashi Takeda, Shiro Funahashi, Kohsei Takahashi, Rong-Jun Xie, Naoto Hirosaki
Summary: Eu2+ doped beta-sialon is a common green emitting phosphor used in white light emitting diodes, and its luminescent center is located at the interstitial site of the crystal structure and coordinated by nine anions.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Physical
Xiaofang Yu, Dengwen Yuan, Xiaoyun Mi
Summary: White-emitting Ca-3(PO4)(2): Dy3+ phosphors were synthesized via hydrothermal method. The pH value and calcination temperature significantly influenced the phosphor morphology and luminescent properties, with samples at pH 7 exhibiting the best luminescence properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Applied
Guiyuan Liu, Bin Liu, Jinkai Li, Zongming Liu
Summary: In this study, Gd3+/Eu3+ activated Ba3Y4O9 (BYO) phosphors were successfully synthesized using coprecipitation method. The precursor composition, crystal structure stability, microscopic morphology, photoluminescence (PL)/photoluminescence excitation (PLE) spectra, and fluorescence attenuation analysis of the phosphors were discussed in detail. The results showed that the phosphors had uniform particle size and high fluorescence intensity, making them suitable for lighting and optical display applications.
JOURNAL OF RARE EARTHS
(2022)
Article
Chemistry, Physical
Hannah Byron, Isabella Norrbo, Mika Lastusaari
Summary: Hackmanites with multiple optical properties were synthesized through solid-state reaction, showing typical blue-white photoluminescence and white persistent luminescence. The study also discussed optical energy storage properties and tuning methods for hackmanites synthesized without zeolite A for the first time, advancing their potential applications in optical materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Xinyu Liu, Wanyin Ge, Yifei Wang, Xiuqi Chen, Jing Li, Panpan Song, Ye Tian
Summary: In this study, CsPbCl3:Eu3+ perovskite nanocrystals were synthesized using Eu3+ ions as dopant to reduce the toxicity of CsPbCl3 nanocrystals. The CsPbCl3:Eu3+ nanocrystals exhibited improved luminescence performance and stability. Furthermore, a layer of TPU film was coated on the surface of the CsPbCl3:Eu3+ nanocrystals prepared by the heat injection method, showing excellent tensile and waterproof properties, providing a new idea for luminescent films.
Article
Chemistry, Inorganic & Nuclear
Xiulan Wu, Liang Du, Qiang Ren, Yujing Zhao, Ou Hai
Summary: A series of LiLaSiO4:xDy(3+), yEu(3+) phosphors were synthesized by high-temperature solid-phase method, and their properties were analyzed using various techniques. It was found that the luminescence intensity of Dy3+ and Eu3+ in the phosphors was affected by the doping concentration, with energy transfer observed between Dy3+ and Eu3+. By adjusting the doping concentration percentage of Eu3+ and Dy3+, the phosphors can achieve lighting with warm white light-emitting diodes.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Engineering, Electrical & Electronic
Li Yang, Qiu Jianrong
Summary: Long persistent phosphors exhibit significant advantages in the applications of biomedicine, energy, environment, and new technology fields, attracting a wide range of researchers in materials, chemistry, physics, and biomaterials fields. This review introduces the history, revival, and thriving development process of long persistent phosphors, as well as highlighting important timing points, key achievements, and main problems. It is believed that long persistent phosphors will rejuvenate with their unique charm and continue to attract researchers interested in luminescence phenomenon to innovate and advance.
LASER & OPTOELECTRONICS PROGRESS
(2021)
Review
Chemistry, Inorganic & Nuclear
Xiulan Wu, Liang Du, Yulin Zheng, Qiang Ren, Mengkang Pei, Ou Hai
Summary: Several Li2Mg1-xSiO4:xMn(2+)(x = 0.02, 0.04, 0.06, 0.08 and 0.10) phosphors were successfully synthesized using a high temperature solid phase method. The optimal emission intensity was found at a Mn2+ ion doping concentration of x = 0.06, indicating potential applications in white LEDs activated by near-ultraviolet chips.
Article
Materials Science, Ceramics
Anees A. Ansari, M. A. Majeed Khan
Summary: Luminescent CeF3 and CeF3:Tb3+ nanoparticles were synthesized at a lower temperature using a wet chemical method. The introduction of Tb3+ ion into the CeF3 crystal lattice was confirmed, and the nanoparticles showed superior luminescent and optical properties. The nanomaterials have potential applications in laser-based biological events.
CERAMICS INTERNATIONAL
(2023)
Review
Chemistry, Multidisciplinary
Chun Xu, Chang Lei, Yue Wang, Chengzhong Yu
Summary: Dendritic mesoporous silica nanoparticles have attracted attention due to their wide applications, but the terminology used is ambiguous. This review provides a critical analysis of reported dendritic silica nanoparticles according to their structural classification, updating the understanding of their formation mechanisms and the control of structural parameters. The review also focuses on the applications of dendritic mesoporous nanoparticles in the biomedical field, offering new insights into the structure-property relationship.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Ge Gao, Qiang Li, Pengxiao Hao, Xiao Huang, Hongjie Luo
Summary: In this study, a series of ZnxMg1.99-xSnO4:0.01Mn(2+) (x = 0, 0.01, 0.02, 0.03, 0.04) green long afterglow phosphors were prepared by high-temperature solid-phase reaction, and the photoluminescence and long afterglow performance of the host material doped with Zn2+ were investigated. The results showed that the emission peak of Mn(2+) shifted towards longer wavelengths with increasing Zn2+ concentration. Zn0.03Mg1.96SnO4:0.01Mn(2+) had the strongest green luminescence intensity, while Zn0.01Mg1.98SnO4:0.01Mn(2+) exhibited superior long afterglow performance. It was concluded that Zn0.01Mg1.98SnO4:0.01Mn(2+) could be a potential candidate for novel long afterglow phosphors, and hyperspectral imaging provided a new research approach for the rational proportioning of luminescent materials.
JOURNAL OF MATERIOMICS
(2023)
Article
Chemistry, Physical
Z. Wang, L. Zhang, L. Dong, Y. Xu, S. Yin, H. You
Summary: Novel Cr3+-Yb3+ codoped KGa11O17 and KAl11O17 phosphors were prepared via a traditional solid-state method, showing high efficiency and broad absorption in the UVevis region. Energy transfer enables effective conversion of high-energy UVevis light into low-energy NIR light, making them promising solar spectral conversion materials for c-Si solar cells.
MATERIALS TODAY ENERGY
(2021)
Article
Thermodynamics
Chao Yan, Hao Zhao, Ziyu Wang, Guohui Song, Ying Lin, Clayton R. Mulvihill, Ahren W. Jasper, Stephen J. Klippenstein, Yiguang Ju
Summary: This study investigates the oxidation reactions of dimethyl ether (DME) under high pressure conditions using a supercritical pressure jet-stirred reactor (SP-JSR). The results show weakened NTC behavior and a shift in the intermediate-temperature oxidation window at high pressure. The study updates the reaction rate models for several important reactions, improving the predictability for key species.
COMBUSTION AND FLAME
(2022)
Article
Thermodynamics
Minhyeng Kim, Kendyl A. Waddell, Peter B. Sunderland, Vedha Nayagam, Dennis P. Stocker, Daniel L. Dietrich, Yiguang Ju, Forman A. Williams, Phillip Irace, Richard L. Axelbaum
Summary: An improved understanding of cool diffusion flames, investigated in the microgravity environment of the International Space Station using a spherical porous burner, has the potential to enhance engine performance. The experiments included various fuel and oxygen concentrations, pressures, and flow rates, and utilized diagnostics such as intensified video cameras, radiometers, and thermocouples. The results revealed the presence of spherical cool diffusion flames, with particular conditions required for their production, and highlighted the significance of burner temperature and rich regions near a mixture fraction of 0.53.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Thermodynamics
Xingqian Mao, Hongtao Zhong, Ziyu Wang, Timothy Ombrello, Yiguang Ju
Summary: This study numerically investigates the effects of non-equilibrium nanosecond plasma discharge on the critical ignition volume, minimum ignition energy, and chemistry in a plasma-assisted H2/air flow. It examines the interactions between discharges/ignition kernels in different regimes and analyzes the impact of flow velocity and pulse number on ignition enhancement. The findings reveal that flow velocity increases the minimum ignition energy and that the minimum critical ignition volume decreases with the increase of plasma discharge energy. Sequential two-pulse discharges show ignition failure in certain regimes but succeed in the fully-coupled regime at a shorter inter-pulse time. The study also demonstrates that an optimal pulse repetition frequency and pulse number can achieve effective ignition enhancement.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Engineering, Multidisciplinary
Florian Schulz, Franziska Reincke, Frank Beyrau
Summary: This paper examines the performance of a specific measuring principle based on infrared thermography for monitoring the spray impact of a multi-nozzle spraying tool. By analyzing the wetting pattern on a heated plate, the position, size, and intensity of the spray impact areas can be determined, enabling conclusions to be drawn about the alignment of the individual nozzles and the functionality of the water-bearing and air-bearing lines.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
Christopher B. Reuter, Ziyu Wang, Wenbin Xu, Yiguang Ju
Summary: This investigation examines the effectiveness of flame suppressants on both hot flames and cool flames. It is found that chemically based suppressants are less effective on cool flames compared to hot flames, and some mildly flammable suppressants can ignite under cool flame conditions. Detailed analysis reveals that the reaction rates interfering with radical production are much lower in cool flames. This premature oxidation phenomenon is not predicted by kinetic models.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Thermodynamics
Ziyu Wang, Hao Zhao, Chao Yan, Ying Lin, Aditya D. Lele, Wenbin Xu, Brandon Rotavera, Ahren W. Jasper, Stephen J. Klippenstein, Yiguang Ju
Summary: Methanol oxidation was studied in a supercritical pressure jet-stirred reactor. It was found that the onset temperature of methanol oxidation at 100 atm is lower than that at 10 atm and a negative temperature coefficient (NTC) behavior was observed at fuel-rich conditions. The kinetics models failed to predict these trends accurately. By updating elementary reaction rates and adding new reaction pathways, the model improved but discrepancies still exist.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Thermodynamics
Tianhan Zhang, Adam J. Susa, Ronald K. Hanson, Yiguang Ju
Summary: This study investigates the initiation, propagation, and transition of spherical cool and double flames induced by laser ignition using a detailed mechanism simulation. The results show that the laser ignition generates vortex pairs that distort the temperature field and distribution of radicals. The laser-ignited hot flame can transition to a cool flame or a transient premixed double flame depending on the laser pulse energy.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Thermodynamics
Christopher M. Burger, Nils Hansen, Angie J. Zhang, Yiguang Ju
Summary: The low-temperature oxidation of methane by CuO using a coaxial, fixed bed, double dielectric barrier discharge (DBD) reactor was investigated. The experiment showed that plasma conditions significantly enhanced fuel oxidation and CO2 production at lower temperatures (≤600°C) compared to non-plasma conditions.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Thermodynamics
Hao Zhao, Chao Yan, Guohui Song, Ziyu Wang, Yiguang Ju
Summary: The low and intermediate temperature oxidation of propane was studied in a supercritical pressure jet stirred reactor (SP-JSR) under different conditions. The experiment found a weak negative temperature coefficient (NTC) behavior at 100 atm due to the shift of intermediate temperature HO2 chemistry to lower temperature. Existing literature models could capture the onset temperatures of low and intermediate chemistry, but failed to predict the fuel oxidation quantitatively and capture the NTC behavior. This highlights the uncertainties in developing hierarchy models for fuels with low temperature chemistries at extremely high pressures.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Chemistry, Physical
Christopher M. Burger, Angie J. Zhang, Yijie Xu, Nils Hansen, Yiguang Ju
Summary: The chemical reaction network of low-temperature plasma-assisted oxidation of methane and ethylene with nickel oxide was studied using electron-ionization molecular beam mass spectrometry. Plasma significantly enhanced methane oxidation between 400 and 500 degrees C, while no oxidation was observed without plasma. Different oxidation stages were observed for methane at higher temperatures. Ethylene experiments showed the formation of new intermediate oxygenated species under plasma conditions. Carbon deposits were observed in both methane and ethylene conditions. A reaction pathway analysis was created based on experimental observations and simulations.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Physical
Ziyu Wang, Chao Yan, Bowen Mei, Ying Lin, Yiguang Ju
Summary: This study investigates the oxidation of diethyl ether (DEE) under low-temperature and ultra-high-pressure conditions. The experimental data shows that DEE exhibits unusual low-temperature oxidation behavior with two negative temperature coefficient (NTC) zones. Increasing the pressure stabilizes RO2 and promotes HO2 chemistry, resulting in weaker NTC zones. The existing DEE model is updated to improve the predictability of key species, especially at intermediate temperature.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Thermodynamics
Long Zhu, Qiang Xu, Bingzhi Liu, Cheng Xie, Yanbo Li, Hong Wang, Hao Lou, Qingbo Zhu, Snehasish Panigrahy, Henry Curran, Ziyu Wang, Yiguang Ju, Zhandong Wang
Summary: This paper investigated the ozone-initiated low-temperature oxidation of methane and ethane and identified numerous oxygenated species as the products. The study revealed that the reaction mechanism of alkylperoxy radicals is crucial in accurately predicting the low-temperature oxidation chemistry of methane and ethane. The results highlight the need for further research on the key intermediates in the base model for chemically sensitized low-temperature fuel oxidation.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Thermodynamics
Madeline Vorenkamp, Scott A. Steinmetz, Timothy Y. Chen, Xingqian Mao, Andrey Starikovskiy, Christopher Kliewer, Yiguang Ju
Summary: This study investigates the effect of nanosecond dielectric barrier discharge (ns-DBD) plasma on deflagration to detonation transition (DDT) in a microchannel with a fuel-lean, DME, oxygen, and argon premixture. The results show that the plasma discharge can nonlinearly affect the onset time and distance of DDT. By adjusting the number of discharge pulses, DDT can be controlled. This research is of great importance for improving advanced propulsion engines.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Energy & Fuels
Aditya Dilip Lele, Yiguang Ju
Summary: This study introduces a reaction molecular dynamics-based method to examine the pyrolysis chemistry and species timescales, and evaluates the impact of mass residence time distribution (RTD) on product selectivity and yield. Reactive molecular dynamics simulations for polypropylene pyrolysis were conducted with different RTDs, and it was found that RTD and reaction chemistry control the peak non-equilibrium product concentrations. Additionally, product selectivity is strongly affected by average residence time and RTD.
Article
Engineering, Multidisciplinary
Moritz Stelter, Fabio J. W. A. Martins, Frank Beyrau, Benoit Fond
Summary: In this paper, a thermographic 3D particle tracking velocimetry (thermographic 3D-PTV) concept is introduced for simultaneous 3D temperature and velocity measurements in turbulent gas flows. The method uses sub-micron thermographic phosphor particles as flow tracers and employs a double-pulse green laser and four double-frame cameras for volumetric illumination and imaging. By calibrating all cameras and tracking individual particles between two laser pulses, the 3D positions and velocities of the particles are obtained. Temperature measurements are achieved using the same particles through ratiometric phosphor thermometry. The concept is demonstrated in a turbulent heated gas jet, successfully reconstructing the symmetry of the velocity and temperature distributions.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2023)