Article
Biochemistry & Molecular Biology
Albena Bachvarova-Nedelcheva, Stancho Yordanov, Reni Iordanova, Irina Stambolova, Angelina Stoyanova, Nelly Georgieva, Veronica Nemska
Summary: TiO2 nanopowders modified by Nd and Sm were prepared using the sol-gel technique. Samples containing Sm were amorphous up to 300 degrees C, while those with Nd preserved a mixed organic-inorganic amorphous structure at higher temperatures. Samples heated at 500 degrees Celsius showed photocatalytic activity under UV irradiation and exhibited good antimicrobial activity against E. coli K12 and B. subtilis.
Article
Polymer Science
Monika Skruodiene, Meldra Kemere, Greta Inkrataite, Madara Leimane, Rimantas Ramanauskas, Ramunas Skaudzius, Anatolijs Sarakovskis
Summary: We synthesized a crack-free optically active SiO2 glass-composite material containing YAG:Ce using a modified sol-gel technique. YAG:Ce doped with Ce3+ was trapped in SiO2 xerogel to create the composite material. X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques confirmed the exceptional quality and structural integrity of the synthesized samples. The luminescence properties of the obtained materials were also studied. Furthermore, boron-doped YAG:Ce glass was synthesized for the first time.
Article
Engineering, Chemical
Xing Qin, Hui Chen, Jihong Pang, Lei Zhao, Jinhua Zhang
Summary: TiN nanoparticles were prepared using a Ni-catalysed carbothermal reduction nitridation process. Nickel was found to significantly promote the reaction and enhance the efficiency of carbothermal reduction nitridation.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
R. Senthil Kumar, K. H. Sai Priyanka, A. K. Khanra, R. Johnson
Summary: A facile methodology of synthesizing highly reactive nano Y2O3 powders to fabricate submicron yttria ceramics with superior optical and mechanical properties is reported. The sintered samples achieved high IR transmissions and enhanced mechanical properties with submicron grain sizes.urther characterization for their thermal properties was conducted on sintered and HIPed Y2O3 specimens.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
K. Park, H. Kim, G. W. Jung, S. Y. Gwon, D. H. Kim
Summary: Ce3+ and Pr3+ co-doped Lu3Al5O12 phosphors were synthesized by the sol-gel process. Their crystal structure, photoluminescence properties, and energy transfer from Ce3+ to Pr3+ were studied. The phosphors showed green-yellow and red emission, with the red emission intensity enhanced by the incorporation of Pr3+.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Gertrud Kraeuter, Angela Eberhardt, Florian Peskoller, Nusret Sena Gueldal, Alfred Lell, Riina Ritasalo, Tero Pilvi, Manfred Roemer, Gerhard Domann, Peer Loebmann
Summary: By using Sol-gel formulations instead of silicone as the matrix material for phosphors in pc-LEDs, organic groups were minimized to reduce yellowing during operation. YAG:Ce particles were evenly embedded in Sol-gel binders, resulting in operational light sources that were compared to standard silicone-based elements for performance. Additional ALD laminates were deposited to seal possible defects within the Sol-gel matrix for extra protection of the phosphors and underlying LEDs.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Anchal Sharma, Puneet Negi, Ruhit Jyoti Konwar, Hemaunt Kumar, Yogita Verma, Shailja, Prakash Chandra Sati, Bhargav Rajyaguru, Himanshu Dadhich, N. A. Shah, P. S. Solanki
Summary: Pure and doped derivatives of TiO2 with nitrogen and cobalt as dopants were synthesized using auto-combustion sol-gel technique. The doping effects on the structural, optical, and electrical properties were investigated. The results showed that doping can tune the band gap of TiO2, making it suitable for photocatalytic and photovoltaic applications.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Beata Pecusova, Anna Prnova, Jana Valuchova, Milan Parchoviansky, Robert Klement, Dusan Galusek
Summary: The ytterbium-aluminate microspheres with ytterbium-aluminium garnet composition doped by different amounts of Er2O3 were prepared. The prepared systems were mostly X-ray amorphous with the presence of traces of ytterbium-aluminium garnet phase and ytterbium oxide. The thermal analysis showed crystallization of the prepared systems in the temperature range of 914-984 degrees C.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
K. Park, H. Kim, S. Y. Gwon, G. W. Jung, S. W. Kim
Summary: Phosphors of Lu2.94Al5O12:0.06Ce3+ prepared via a sol-gel process showed significantly enhanced photoluminescence properties under different synthesizing temperatures and fluoride fluxes, resulting in green-yellow emissions due to Ce3+ transitions. Among them, the 6 wt% BaF2-added Lu2.94Al5O12:0.06Ce3+ phosphor synthesized at 1400 degrees C exhibited the highest emission intensity, 173% stronger than that of the flux-free phosphor.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Long Chen, Zhengjuan Wang, Zhenhai Xue, Guohong Zhou, Shiwei Wang
Summary: Mullite ceramics with different alumina content were synthesized using the sol-gel method, and the synthesis process, microstructure evolution, mechanical, and optical properties were studied. The results showed that the alumina content affected the grain size and properties of the ceramics.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Taotao Hu, Wenzhi Huang, Ruiqi Zhong, Jindong Zhang, Na Zeng, Yangyang Wang, Wanyu Liu
Summary: LaMgAl11O19:Eu3+ (LMA:Eu3+) nano-powders were synthesized via sol-gel process, and the crystal growth activation energy was decreased by adding ethanol. The lowest activation energy of 57.95 +/- 2.62 kJ/mol was achieved with a water/ethanol volume ratio of 1:3 and an AcOH/metal ions molar ratio of 1:1. However, the phase composition and micro-structure of the powders were less affected by the addition of organic additives. The LaMgAl11O19:Eu3+ powders exhibited orange-red emission under ultraviolet light excitation.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
K. Park, H. Kim, D. H. Kim, S. Y. Gwon
Summary: (Lu1-xYx)(2.94)Al5O12:0.06Ce(3+) and (Lu1-yGdy)(2.94)Al5O12:0.06Ce(3+) phosphors were prepared by the sol-gel method with a cubic garnet crystal structure. The substitutions of Y3+ and Gd3+ for Lu3+ in the Lu3Al5O12:Ce3+ phosphors affected the environment of Ce3+ and photoluminescence properties. The lattice distortion factors and maximum emission wavelengths were investigated to study the influence of Y3+ and Gd3+ concentrations on the emission wavelengths of the substituted phosphors. The Y3+ and Gd3+ substitutions induced lattice distortion and shifted the emission band towards the red spectral region. Empirical equations between lattice distortion factors and maximum emission wavelengths were proposed. The Y3+ and Gd3+ substituted phosphors showed tunable emission wavelength for potential applications in white light-emitting diodes.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Ahlem Bendaoued, Mouna Messaoud, Omar Harzallah, Sophie Bistac, Rached Salhi
Summary: In this paper, TiO2 was prepared by the sol-gel process and reinforced the polypropylene matrix using supercritical drying of ethanol, while maintaining thermal and mechanical properties and ensuring good interface compatibility. The use of 5wt.% TiO2 was found to effectively increase the crystallinity and dynamic and static mechanical properties of the polypropylene matrix.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Maxime Gayrard, Benedetta Marmiroli, Francois Chancerel, Philippe Decorse, Heinz Amenitsch, Jennifer Peron, Andrea Cattoni, Marco Faustini
Summary: Noble metal coordination xerogel films exhibit solubility switching with increasing X-ray irradiation, making them recyclable negative tone resists for deep X-ray lithography that can be further converted into metallic nanoarchitectured films.
Article
Chemistry, Physical
V Poojitha, S. Mahalakshmi, K. Santhi, S. Nithyanatham
Summary: In this study, multiferroic bismuth ferrite was prepared using the sol-gel method and its structural and optical characteristics were examined. X-ray diffraction and Fourier transform infrared analysis were used to study the structure, while field emission scanning electron microscopy was used to observe the morphology. The research found that bismuth ferrite has potential importance in applications such as high dielectric constant capacitors and hard disc components.
SURFACES AND INTERFACES
(2023)
Article
Engineering, Chemical
Ri Zhang, Shasha Zhang, Mengyan Ding
Summary: A thin liquid film method is proposed to evaluate sand erosion in annular flow. This method considers the direct interaction between the liquid film and gas core, as well as the entrainment and deposition of droplets. The erosion rate is calculated by considering the effects of liquid entrainment and particle velocity decay. The method is fully verified by comparing with experimental data.
Article
Engineering, Chemical
Yu Suo, Xianheng Su, Wenyuan He, Xiaofei Fu, Zhejun Pan
Summary: This research investigates the mechanical properties of sandstone-shale composite through orthogonal experimental method and discrete element simulation. The results show that different lithologies and thickness ratios can affect the strength and fracture mode of the composite rock samples.
Article
Engineering, Chemical
Maurizio Troiano, Andrea El Hassanin, Roberto Solimene, Alessia Teresa Silvestri, Fabrizio Scala, Antonino Squillace, Piero Salatino
Summary: This study investigates the potential of Fluidized Bed Finishing (FBF) for square flat AlSi10Mg specimens manufactured via Laser-Powder Bed Fusion (L-PBF) additive manufacturing technology. The results show that good finishing can be achieved using rotation-assisted tests, with a maximum reduction of surface roughness by 67%. Steel particles are found to be the most effective bed material.
Review
Engineering, Chemical
Ningbo Song, Wanzhong Yin, Jin Yao
Summary: Seawater's dissolved salts and minerals have various effects on the flotation process, including influencing the characteristics and behavior of flotation factors, as well as affecting the surface of sulfide minerals. In most cases, seawater has adverse effects on the flotation of sulfide minerals, but these effects can be mitigated by adjusting the reagents.
Article
Engineering, Chemical
Kaiqiao Wu, Shuxian Jiang, Victor Francia, Marc-Olivier Coppens
Summary: In rectangular and cylindrical annular fluidized beds, pulsating gas flow can create regular bubble patterns, overcoming challenges seen in conventional units. This study provides new opportunities for modularization of fluidized bed operations.
Article
Engineering, Chemical
Shuo Li, Huili Zhang, Jan Baeyens, Miao Yang, Zehao Li, Yimin Deng
Summary: The paper assesses the behavior of cohesive Geldart C-type particles when fluidized by air with the aid of vibration. It determines that mechanical vibration is a simple and effective method to improve the fluidity of cohesive particles during fluidization.
Article
Engineering, Chemical
Zhenfei Feng, Qingyuan Zhang, Shanpan Liang, Zhenzhou Li, Fangwen Guo, Jinxin Zhang, Ding Yuan
Summary: A new micro/mini-channel heat sink (MCHS) with a combined structure of longitudinal and transverse vortex generators is designed, using Al2O3 nanofluid as the working medium. The study explores the effects of transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic and thermal characteristics, comprehensive performance, entropy generation, and exergy efficiency. The results show that the triangular transverse vortex generator improves the comprehensive performance and exergy efficiency. Combined with the longitudinal vortex generator, the MCHS achieves the best comprehensive performance, entropy generation, and exergy efficiency when the Reynolds number is 742.
Article
Engineering, Chemical
Kostas Giannis, Christoph Thon, Guoqing Yang, Arno Kwade, Carsten Schilde
Summary: This study presents a 3D convolutional neural network (3D-CNN) methodology for generating realistic 3D models of particles. The method trains on 2D projections of particle images to predict their 3D shapes, and evaluates the accuracy of the predictions using Fourier shape descriptors (FSDs). This methodology has wide applications in particle shape analysis.
Article
Engineering, Chemical
Zheng-qing Zhou, Lu-jia Chai, Yu-long Zhang, Ya-bin Wang, Ze-chen Du, Tian-yi Wang, Yu-zhe Liu
Summary: The dynamic oxidation and shell-breaking processes of aluminum nanoparticles (ANPs) during heating were studied using in situ transmission electron microscopy. The results revealed that the changes in shell thickness can be divided into three stages, and the active aluminum content of ANP decreased before shell-breaking.
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Review
Engineering, Chemical
Matteo Errigo, Christopher Windows-Yule, Massimiliano Materazzi, Dominik Werner, Paola Lettieri
Summary: Gas-solid fluidized-bed systems have advantages in terms of chemical reaction efficiency and temperature control, making them widely used in industrial applications. However, the design, scale-up, and optimization of these complex units are limited by the lack of deep physical understanding. Non-invasive and non-intrusive diagnostic techniques provide a way for researchers to study these systems without affecting the flow field or directly contacting the medium under study.
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Chemical
Xuan Liu, Jie Gong, Kai Jiang, Xiaojuan Lai, Yu Tian, Kang Zhang
Summary: This study aimed to improve the performance of lignite coal water slurries (CWSs) by synthesizing a series of three-arm amphiphilic block copolymers. By controlling the relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content, the apparent viscosity of CWSs was significantly reduced and the static stability was improved. Thermogravimetric testing and XPS analysis were conducted to reveal the mechanism behind the improved performance.
Article
Engineering, Chemical
Lanka Dinushke Weerasiri, Daniel Fabijanic, Subrat Das
Summary: Fluidization at low pressure offers significant benefits for the fine chemical industry. This study investigates the behavior of bubbles and bed expansion under low pressure conditions. It is found that lower pressure leads to larger bubbles, increased bubble quantity, and higher aspect ratio. The predictability is affected by the inhomogeneous fluidization, but low pressure fluidization can generate similar bubble sizes with lower fluidizing mass compared to atmospheric pressure.