Article
Polymer Science
Zhenxia Ke, Lingjie Yu, Guanlin Wang, Runjun Sun, Mengqiu Zhu, Hanrui Dong, Yiqin Xu, Mengyue Ren, Sida Fu, Chao Zhi
Summary: In this paper, a novel method for constructing the real meso-structure of spun-bonded nonwoven fabric using computer image processing technology based on the idea of a point-line-body was proposed. The finite element method was adopted to predict filtration efficiencies based on the built 3D model. Filtration experiments were carried out to verify the effectiveness of the constructed meso-structure and simulation model.
Article
Chemistry, Applied
Lin Huang, Juan Wang, Haipeng Zhang, Guannan Zu, Zhentao Wang, Yonghong Fu
Summary: In this study, flower-like and linear-like YVO4:Eu3+ hollow mesoporous spheres were synthesized and connected with Eu organic ligand, leading to the formation of a new hybrid luminescent material. The hybrid material showed higher emission intensity compared to single YVO4:Eu3+ and single Eu complexes, achieving mutually reinforcing luminescence. This paper presents a new approach to connect rare earth complexes for the fabrication of non-silicon-based mesoporous spherical matrix.
JOURNAL OF RARE EARTHS
(2023)
Article
Materials Science, Ceramics
Imene Lounis, Khadidja Khenfer
Summary: Little information is published on the hardness and corrosion resistance properties of WC-Mn-Cu-Ni alloys infiltrated by an NdPrFeB alloy. The effect of particle size and percentage of addition of neodymium and praseodymium on the mechanical and electrochemical properties of the composite WC-Cu-Ni-Mn/binder was studied. The micrographs revealed the strong chemical activity of Nd and Pr. The addition of 4-5 wt% of rare earth (RE) is recommended for the sample elaborated by spontaneous infiltration.
CERAMICS INTERNATIONAL
(2023)
Article
Polymer Science
Victor M. Garcia Ramirez, Antonieta Garcia Murillo, Felipe de J. Carrillo Romo, Rosa I. Alvarez Gonzalez, Eduardo Madrigal Bujaidar
Summary: This study reports on the synthesis and characterization of La2O3:Eu3+ luminescent aerogels using the sol-gel method and supercritical drying technique. The concentration of Eu3+ ion was varied to investigate its impact on the luminescent properties of the aerogels. XRD and TEM analysis revealed that the La2O3:Eu3+ aerogels exhibited semi-crystalline behavior regardless of the concentration of europium. SEM images showed a porous structure composed of interconnected quasi-spherical nanoparticles forming coral-shaped agglomerates. Photoluminescence spectroscopy demonstrated an infrared emission at ? = 793 nm, with the highest emission intensity observed for the aerogel with 50% Eu3+. These results highlight the potential of manufacturing rare-earth oxide luminescent aerogels without heat treatment for opto-electronic devices.
Article
Chemistry, Multidisciplinary
Aditya Ranjan Ray, Sujata Mishra
Summary: Modern scientific progress has made rare earth elements more important due to their specific chemical and physical properties. Proper handling and recovery of valuable products like rare earths will address environmental and societal issues caused by mining and industrial waste.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2023)
Article
Materials Science, Ceramics
S. Torres-Garcia, C. Hernandez-Alvarez, M. Medina-Alayon, P. Acosta-Mora, A. C. Yanes, J. del-Castillo, A. Menendez-Velazque, J. Mendez-Ramos
Summary: Anti-counterfeiting strategies are developed to combat counterfeit markets and prevent sophisticated counterfeiters from mimicking luminescent security inks. Rare-earth doped up-conversion luminescent materials offer advantages such as invisibility in ambient light, low cost excitation, absence of background noise, and minimal auto-fluorescence. This study focuses on color tuneable upconversion emissions in two types of rare-earth doped photonic materials, allowing for tailored luminescence and creating a light-responsive encrypted security code based on intensity ratios of UV and VIS up-conversion emission bands.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Applied
Fenghan Wei, Chao Bai, Huai-Ming Hu, Shi He, Xiaofang Wang, Ganglin Xue
Summary: A novel luminescent europium-centered hybrid material named Eu(tta)(3)NCP-TiO2 was prepared and characterized, showing good thermostability and long luminescence lifetime. It exhibited superior detection for nitrobenzene molecule and Cu2+ ion, with detection limits of 5.593 x 10(-5) and 9.566 x 10(-5) mol/L, respectively. This material can serve as an efficient fluorescence probe for the detection of nitrobenzene and Cu2+ ion.
JOURNAL OF RARE EARTHS
(2021)
Article
Polymer Science
Xianglong Li, Jing Liu, Yishen Lu, Teng Hou, Jing Zhou, Antuo Wang, Xianggui Zhang, Bin Yang
Summary: A new environmentally-friendly disposable nonwoven based on centrifugally spun ST/PVA ultrafine fibrous membrane was developed in this research. The study optimized the ST/PVA ratio of fibers for improved disposability and tensile strength of the fibrous membranes, with untreated and post-treatment fibrous membranes showing significant differences in disintegration and tensile strength.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Construction & Building Technology
Ulli Heinlein, Thomas Freimann
Summary: This study investigates the behavior of nonwovens during concrete pouring and their bond with concrete for waterproofing purposes. It was found that nonwovens are first compressed by the fresh concrete load, then filled with cement paste during vibration compaction, and finally decompressed due to the residual stress of the fibers. The research suggests that nonwovens with low void volumes should be designed for a waterproof bond in concrete construction.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Metallurgy & Metallurgical Engineering
Ahmed Atef Eliwa, Amal Essam Mubark, Nasr Abelaziz Abdelfattah, Ebrahim Abd El Gawad
Summary: Phosphogypsum (PG), a main by-product of phosphoric acid production industries, is considered as one of the most important secondary sources of rare earth elements (REEs). This study successfully recovers REEs from PG using citric acid leaching process, while preserving the phosphate content. The optimal conditions include 14 days of soaking time, 7.5% citric acid concentration, and a solid-to-liquid ratio of 1/5 at ambient temperature. The dissolution efficiency of REEs reaches 79.57% under the optimal conditions.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Chemistry, Applied
Pushpendra, Indranil Suryawanshi, Rimple Kalia, Ravi K. Kunchala, Shyam Lal Mudavath, Boddu S. Naidu
Summary: This study reports the use of Gd0.95Eu0.05PO4 nanorods for latent fingerprint visualization under 395 nm light. The nanorods exhibit excellent photoluminescence properties and strong fuchsia emission. They have been successfully employed for developing clear and well-defined latent fingerprints on various substrates.
JOURNAL OF RARE EARTHS
(2022)
Article
Materials Science, Textiles
S. Viju, G. Thilagavathi
Summary: This study developed nonwoven fabrics using needle punching technology and analyzed their comfort characteristics in terms of thermal conductivity, water absorbency, and air permeability. The Box-Behnken experimental design was used to investigate the effects of needle punch density, needle penetration depth, and fabric areal weight on these properties. The results showed that a needle punch density of 75 punches/cm², needle penetration depth of 8 mm, and fabric areal weight of 150 g/m² achieved the maximum water absorbency of 494%, air permeability of 79 cm³/cm²/s, and the minimum thermal conductivity of 0.0251 W/mK.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Materials Science, Textiles
Tao Yang, Xiaoman Xiong, Yuanfeng Wang, Rajesh Mishra, Michal Petru, Jiri Militky
Summary: The study applies acoustical inversion methods to estimate structural parameters of polyester nonwoven materials, using least square and Bayesian approaches. The results show good agreement between the two methods, with parameters estimated from the Bayesian method selected for further analysis.
FIBERS AND POLYMERS
(2021)
Review
Chemistry, Multidisciplinary
Suzhi Cai, Zhongfu An, Wei Huang
Summary: This paper highlights recent advances in luminescent hydrogen-bonded organic frameworks (HOFs), including their construction, luminescent properties, and applications. Luminescent HOFs can be divided into fluorescent HOFs and room-temperature phosphorescent HOFs, with additional features such as color-tunable luminescence, stimuli-responsive luminescence, or mechanoluminescence. These distinctive features enable a wide range of applications in chemical sensing, microlasers, stimuli-responsive sensing, oxygen sensing, and data encryption. This review not only provides the basic principles of designing luminescent HOFs, but also highlights future research perspectives, laying the foundation for developing and expanding the applications of luminescent HOFs in the field of luminescent porous materials.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Applied
Qiang He, Jinfa Chen, Limei Gan, Menglan Gao, Miaomiao Zan, Yanfei Xiao
Summary: Clay minerals play a crucial role in ion adsorption type rare earth ore, controlling the adsorption and desorption processes of rare earth. Experimental studies reveal that the adsorption and competitive adsorption abilities of cations depend on their charge and hydrolysis properties, while the desorption of rare earth and aluminum is influenced by the concentration driving forces of high concentrations of magnesium and ammonium ions, although high-concentration desorbents may hinder the desorption reactions. Additionally, the solid-phase Al(OH)(3) generated at high peak aluminum concentration delays the efflux of aluminum, partially separating rare earth from aluminum.
JOURNAL OF RARE EARTHS
(2023)