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Influence of Biomimetic Apatite Coating on the Biobehavior of TiO_(2)Scaffolds

Journal of Bionic engineering 2024年第4期21卷 1975-1986页

作者： Shima Mahtabian Seyed Mehdi Mirhadi Nahid Hassanzadeh Nemati Melika Sharifi Fariborz Tavangarian Department of Biomedical Engineering University of DelawareNewarkDE19716USA Department of Ceramic Engineering Islamic Azad University(Shahreza Branch)ShahrezaIsfahan86145-311Iran Department of Biomedical Engineering Islamic Azad University(Science and Research Branch)TehranIran Mechanical Engineering Program School of ScienceEngineering and TechnologyPennsylvania State UniversityHarrisburgMiddletownPA17057USA Department of Materials Science&Engineering Islamic Azad University(Najaf Abad Branch)Najaf AbadIsfahan***Iran Biomedical Engineering Department Pennsylvania State UniversityState CollegeUniversity ParkPennsylvania16802USA

Immersion of scaffolds in Simulated Body Fluid(10SBF)is a standardized method for evaluating their bioactivity,simulating in vivo conditions where apatite deposits can be formed on the surface of scaffold,facilitating bone integration and ensuring their suitability for bone implant purposes,ultimately contributing to long-term implant *** effect of apatite deposition on bioactivity and cell behavior of TiO_(2)scaffolds was *** were soaked in 10SBF for different durations to form HAP layer on their *** results proved the development of a hydroxyapatite film resembling the mineral composition of bone Extracellular Matrix(ECM)on the TiO_(2)*** XRD test findings showed the presence of hydroxyapatite layer similar to bone at the depth of 10 nm.A decrease in the specific surface area(18.913 m^(2)g^(−1)),the total pore volume(0.045172 cm^(3)g^(−1)(at p/p0=0.990)),and the mean pore diameter(9.5537 nm),were observed by BET analysis which confirmed the formation of the apatite *** was found that titania scaffolds with HAP coating promoted human osteosarcoma bone cell(MG63)cell attachment and *** seems that immersing the scaffolds in 10SBF to form HAP coating before utilizing them for bone tissue engineering applications might be a good strategy to promote bioactivity,cell attachment,and implant fixation.

关键词： Titania Hierarchical meso/macro porous 10SBF Biomimetic apatite Coating

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The behavior of different clays subjected to a fast-drying cycle for traditional ceramic manufacturing

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Journal of King Saud University - engineering sciences 2024年第5期36卷 339-348页

作者： Zaccaron, Alexandre de Souza Nandi, Vitor Dal Bó, Marcelo Arcaro, Sabrina Bernardin, Adriano Michael Program on Materials Science and Engineering Universidade do Extremo Sul Catarinense Avenida Universitária 1105 Santa Catarina Criciúma88806-000 Brazil SC Criciúma88813-600 Brazil Ceramic Materials Group Parque Científico e Tecnológico Rodovia Jorge Lacerda 3800 Santa Catarina Criciúma88807-400 Brazil

Studies have been widely carried out on drying techniques and equipment. The behavior of clays subjected to drying stages requires further research. This study aims to evaluate the behavior of the clay ceramic body during the different stages of the drying cycle and match the characteristics of the raw materials with the final quality of the pieces. In this work, the behavior of three different clays in terms of drying performance was studied. The clays were selected, and their chemical, mineralogical, and particle size characteristics were measured. The mixture design (DoE) developed 10 formulations and was processed through vacuum extrusion. The samples were subjected to forced drying cycles of 180 min by varying the temperature from 30 to 90 °C and air speed from 1.5 to 4.0 m/s. At the end of the cycle, the retraction was a determining factor for the crack probability indicator, where formulations that obtained ∼10% retraction in the dry zone showed losses >25%. On the other hand, it is could be stated that claystone assists the drying process of the ceramic piece, minimizing losses. The drying sensitivity coefficient (k-factor) presented values that reproduce the number of losses during drying, proving to be a valid tool to relate clay properties, drying conditions, and losses in this process. In this case, drying process losses >25% were observed when the k-factor was from 1.6. © 2022 The Authors

关键词： Drying

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Injectable Platelet-Rich Fibrin in Contact with Bone Substitutes, Porous Zirconia, or Laser-Textured Implant Surfaces: A Detailed Morphological Analysis

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Biomedical Materials and Devices 2024年第1期2卷 415-426页

作者： Oliveira, Miguel Noronha Varela, Hugo Almeida Nascimento, Rubens M. Sahoo, Narayan Carvalho, Oscar Henriques, Bruno Souza, Júlio C. M. Ceramic and Composite Materials Research Group (CERMAT) Department of Mechanical Engineering (EMC) Federal University of Santa Catarina (UFSC) Post-graduate Program in Materials Science and Engineering Federal University of Rio Grande Norte (UFRN) Center for MicroElectroMechanical Systems (CMEMS-UMINHO) Universidade do Minho LABBELS - Associate Laboratory University of Minho University Institute of Health Sciences (IUCS) CESPU

The aim of the present study was to perform a detailed morphological analysis of an injectable platelet rich fibrin after combination with two different particulate hydroxyapatite-based granules, a porous zirconia block, and laser-textured zirconia or titanium surfaces. Blood samples were harvested from three participants to prepare the flowable injectable PRF in contact or not with particulate hydroxyapatite (Hap), bone mineral granules (DBBM), porous zirconia blocks, laser-textured titanium or zirconia surfaces. Optical and scanning electron microscopy (SEM) were used to evaluate the fibrin network density, fibrin fibers’ diameter, blood cells, and the interaction of PRF with the biomaterials. Histomorphometry of the flowable PRF was also performed using the hematoxylin–eosin staining protocol. Specimens were independently evaluated by two blinded and well-trained researchers in histomorphometry and microscopy. Particulate Hap and DBBM shown different morphological aspects by SEM analyses since DBBM revealed macro- and micro-scale pores while Hap revealed a dense structure. Hydroxyapatite and DBBM granules were entirely embedded by the fibrin-network in the presence of leukocytes and blood platelets. The zirconia porous structured was filled with PRF and its components. Also, the laser-structured zirconia or implant surfaces were entirely coated with the PRF fibrin network embedding leukocytes and blood platelets. Laser-textured titanium surfaces revealed macro- and micro-scale irregularities that increase the surface area and retention of the injectable PRF. Histomorphometric analyses revealed complementary details on the distribution of lymphocytes, red blood cells, and fibrin associated with platelet aggregation. The flowing and viscosity of an injectable platelet rich fibrin provided an agglomeration of synthetic or xenogeneic particulate bone substitutes and the coating of porous zirconia and textured implant surfaces as inspected by scanning electron microsc

关键词： Bone healing Bone substitutes Histology Morphology Platelet-rich fibrin

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Effect of Sodium Dodecyl Sulfate and Hydrogen Peroxide on the Microstructure Evolution of Fiber-Reinforced Lightweight Geopolymer Composite

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SSRN 2024年

作者： Alves, Cleidson Rosa Muller, Anderson Augusto Dal-Bó, Alexandre Gonçalves Bernandin, Adriano Michael Civil Engineering Department Federal Institute of Santa Catarina Santa Catarina Criciúma Brazil Graduate Program in Materials Science and Engineering University of the Extreme South of Santa Catarina Santa Catarina Criciúma Brazil Ceramic Materials Group United States

Lightweight geopolymers have the potential for innovative applications, such as low thermal conductivity material, pH regulator, adsorbent material, and lightweight concrete. However, these materials are often fragile due to their high porosity. In this study, the combined effect of sodium dodecyl sulfate (SDS) with hydrogen peroxide (H2O2) in the pore formation of a geopolymeric mortar reinforced with glass fiber and polypropylene fibers was investigated. The aim was to improve the distribution and morphology of pores, resulting in lower thermal conductivity. Lightweight mortars were produced using metakaolin, alkaline activators, and standardized sand. The innovation in this study lies in the incorporation of fibers as reinforcement in lightweight geopolymers and the microstructural changes resulting from the combination of the pore-forming agent (H2O2) with surfactant (SDS). The microstructural evolution in the fresh state, and density, porosity, and thermal conductivity in the hardened state were evaluated. As a result, the combined use of reinforcement fibers and control of pore volume is effective in the control of the microstructure of the mortar and, as a consequence, its thermal conductivity. SDS significantly contributes to foam stabilization, leading to improvements in thermal conductivity (0.15 W/m.K), Bulk density (1000 kg/m3), and a reduction in the average pore size. This suggests that these materials can be used for both thermal insulation and the construction of lightweight structural walls. © 2024, The Authors. All rights reserved.

关键词： Thermal insulation

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Manganese & Phosphorus Environments in Mno Containing Lithium Phosphate Glasses and Their Electrochemical Response

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SSRN 2023年

作者： Jujam, Nuchjaree Ayawanna, Jiratchaya Kuimalee, Surasak Chanlek, Narong Kidkhunthod, Pinit Laorodphan, Nattapol Program in Applied Chemistry Faculty of Science Maejo University Chiang Mai50290 Thailand School of Ceramic Engineering Institute of Engineering Suranaree University of Technology Nakhon Ratchasima30000 Thailand Depertment of Industrial Chemistry Innovation Faculty of Science Maejo University Chiang Mai50290 Thailand Nakhon Ratchasima30000 Thailand

The structure of MnO-containing lithium phosphate glasses and their electrochemical property was examined in this study. The xMnO–[(1-x)(0.5Li2O–0.5P2O5)] (x = 0, 10, 20, and 30%mol) glasses were prepared by the conventional melt-quench technique in an ambient atmosphere. The amorphous nature of the sample was confirmed by X-ray diffraction (XRD). X-ray absorption spectroscopy (XAS), X-ray photoelectron spectroscopy (XPS) and Fourier-transformed infrared spectroscopy (FTIR) were applied to obtain information on glass structure. The results showed that the transformation of the phosphorus Q unit from Q2 to Q1 can accommodate the Mn2+, which are in a 4-fold coordinated oxygen environment. XAS and XPS also revealed the presence of both Mn2+ and Mn3+, in which only the Mn2+ increases as MnO increases. Specific capacitance obtained from cyclic voltammogram increased with MnO content increases and reached the maximum value of 79.14 F/g. © 2023, The Authors. All rights reserved.

关键词： Phosphorus

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Recent advances in wearable electrochemical biosensors towards technological and material aspects

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Biosensors and Bioelectronics: X 2024年 19卷

作者： Hosseinzadeh Fakhr, Mahan Lopez Carrasco, Ivan Belyaev, Dmitry Kang, Jihun Shin, YeHyeon Yeo, Jong-Souk Koh, Won-Gun Ham, Jeongwoo Michaelis, Alexander Opitz, Joerg Beshchasna, Natalia Fraunhofer Institute for Ceramic Technologies and Systems IKTS Maria-Reiche-Straße 2 Dresden01109 Germany Faculty of Mechanical Science and Engineering Dresden University of Technology Dresden Germany School of Integrated Technology College of Computing Yonsei University Seoul Korea Republic of BK21 Graduate Program in Intelligent Semiconductor Technology Yonsei University Seoul Korea Republic of Department of Chemical and Biomolecular Engineering Yonsei University Seoul Korea Republic of

The next generation of wearable biosensors comes with the latest advancements in biosensor technology. Soft and stretchable electrode materials like hydrogels with the similar functionalities of human tissue including stretchability, self-healability, and responsiveness to different stimuli have emerged as the most versatile materials in wearable electronics. The incorporation of conductive nanofillers is found to enhance the sensitivity of the electrochemical biosensors significantly. Microfluidic technology has reduced the volume of samples and reagents required for the analysis, allowing continuous biomedical monitoring from a drop of biofluid. In this paper, the most advanced progress in electrochemical wearable platforms that can noninvasively and continuously monitor the biochemical markers in body fluids for the diagnosis and health management is reviewed. Innovation in microelectronics, modification, fabrication technologies, and detection methods are the main focus of the discussion. In particular, hydrogel-based sensors and microfluidic systems as the latest technology trends in wearable detection are discussed in detail. Integration of miniaturized electrochemical wearable biosensors with wireless technology as a great promise for real-time healthcare monitoring and point-of-care (POC) diagnostics is also summarized. Finally, we outline the most advanced wearable biosensors with optimized material and design as well as key challenges that need to be addressed to improve sensing performance (accuracy, sensitivity, selectivity, stability), portability (miniaturized size and light weight), and flexibility of the wearable biosensors. © 2024 The Authors

关键词： Body fluids

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Tailoring Mesoporous and Macroporous Structures in Activated Carbon from Naoh-Pretreated Oak for Superior Supercapacitors

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SSRN 2024年

作者： Lim, Mu-Seong Kang, Seo Hui Song, Dae-Yeon Chae, Ji Su Lee, Jae-Won Lee, Younki Roh, Kwang Chul Energy Storage Materials Center Korea Institute of Ceramic Engineering and Technology Gyeongsangnam‑do Jinju-Si52851 Korea Republic of Department of Materials Engineering and Convergence Technology Gyeongsang National University 501 Jinju-daero Gyeongsangnam-do Jinju-Si52828 Korea Republic of Department of Materials Science and Engineering Korea University Anam-Dong Seongbuk-Gu Seoul136-713 Korea Republic of Department of Wood Science and Engineering College of Agriculture and Life Sciences Chonnam National University Gwangju61186 Korea Republic of Interdisciplinary Program in IT-Bio Convergence System Chonnam National University Gwangju61186 Korea Republic of

The growing need for sustainable and efficient energy storage solutions has intensified research efforts into eco-friendly materials such as activated carbon (AC) derived from lignocellulosic biomass. Herein, we present a method to enhance the physical characteristics of AC from oak via NaOH pretreatment. The NaOH-pretreated oak was converted into AC through carbonization and chemical activation using KOH as the activating agent. The AC tended to develop mesopores (2–50 nm) and macropores (> 50 nm) as the pretreatment ratio increased (0%, 1%, 2%, and 8%), achieving a specific surface area of up to 2706 m2 g–1 and a pore volume of up to 1.97 cm3 g–1. This result is due to the transformation of the structure of lignocellulosic biomass into a more advantageous structure for pore development through the reactions of delignification and deacetylation that occur during NaOH pretreatment. The mesoporous and macroporous structures offer efficient ion diffusion pathways and reduce resistance, which leads to superior rate capability, capacity retention, and a gravimetric specific capacitance of 44.5 F g–1 at a current density of 1 mA cm–2 in supercapacitors. These results underscore the potential of NaOH-pretreated oak as a sustainable and effective precursor for high-performance AC in energy storage applications, offering new insights into the optimization of material properties for supercapacitors. © 2024, The Authors. All rights reserved.

关键词： Lignocellulose

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Effect of Order of Addition and Precursor/Reductor Ratio on Direct Synthesis of TiO2 Nanoparticles: Synthesis, Characterization, and Photocatalytic Performance

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SSRN 2022年

作者： Goulart, Silviany de Souza Pereira, Mariana Benetti, Renata Martins Bellettini, Gécica Cardoso Elyseu, Fábio Dal-Bó, Alexandre Gonçalves Bernardin, Adriano Michael Graduate Program on Materials Science and Engineering Universidade do Extremo Sul Catarinense Santa Catarina Criciúma88806-000 Brazil Ceramic Materials Group Parque Científico e Tecnológico Santa Catarina Criciúma88807-420 Brazil

Titanium dioxide (TiO2) is the most used semiconductor for heterogeneous photocatalysis. However, there is a limitation of its application, since TiO2 is activated only under ultraviolet radiation. Sunlight has only about 5% of UV radiation and, consequently, there are limitations for the application and commercialization of this semiconductor. The present study aimed to obtain nanostructured TiO2 powders for photocatalysis under UV light by a direct synthesis route, obtaining anatase and rutile phases without further heat treatment. A 2k factorial experimental design was used to evaluate the effect of the order of addition of precursors and their ratio on the synthesis of NPs. TiO2 nanoparticles with large surface area were synthesized via controlled precipitation method. The NPs were characterized by XRD, DSC/TG, FTIR, BET, DLS, ELS, UV-Vis, FESEM-EDS, and photocatalytic activity test. The commercial TiO2 NP P25 was used as standard photocatalyst for comparison with the obtained samples. The surface area measured by the BET method for the synthesized samples was approximately three to five times higher when compared to P25. The photoactivity of the synthesized samples and P25 were determined for the degradation of the methylene blue and rhodamine B dyes under UVA radiation. The results showed that the synthesized samples have an efficiency equivalent to the P25 sample. The synthesis of nanoparticles via the controlled precipitation method using only two reagents proved to be a viable and promising route. The method does not require heat treatment for titanium dioxide crystallization and is still capable of producing a mixture of ideal phases to delay the recombination of the photogenerated electron-hole pair, contributing to the increase of the photocatalytic efficiency. © 2022, The Authors. All rights reserved.

关键词： Titanium dioxide

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Supervised Contrastive Learning Enhances MHC-II Peptide Binding Affinity Prediction

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SSRN 2024年

作者： Shen, Long-Chen Liu, Yan Liu, Zi Zhang, Yumeng Wang, Zhikang Guo, Yuming Rossjohn, Jamie Song, Jiangning Yu, Dong-Jun School of Computer Science and Engineering Nanjing University of Science and Technology 200 Xiaolingwei Nanjing210094 China Department of Computer Science Yangzhou University Yangzhou225100 China School of Information Enginnering Jingdezhen Ceramic University Jingdezhen333403 China Monash Biomedicine Discovery Institute Department of Biochemistry and Molecular Biology Monash University MelbourneVIC3800 Australia Monash Data Futures Institute Monash University MelbourneVIC3800 Australia School of Life Sciences and Biotechnology Shanghai Jiao Tong University Shanghai200240 China Department of Epidemiology and Preventive Medicine Xiangya Hospital China Infection and Immunity Program Netherlands

Accurate prediction of major histocompatibility complex (MHC)-peptide binding affinity can improve our understanding of cellular immune responses and guide personalized immunotherapies. Nevertheless, the existing deep learning-based approaches for predicting MHC-II peptide interactions fall short of satisfactory performance and offer restricted model interpretability. In this study, we propose a novel deep neural network, termed ConBoTNet, to address the above issues by introducing the designed supervised contrastive learning and bottleneck transformer extractors. Specifically, the supervised contrastive learning pre-training enhances the model’s representative and generalizable capabilities on MHC-II peptides by pulling positive pairs closer and pushing negative pairs further in the feature space, while the bottleneck transformer module focuses on MHC-II peptide interactions to precisely identify binding cores and anchor positions in an unsupervised manner. Extensive experiments on benchmark datasets under 5-fold cross-validation, leave-one-molecule-out validation, independent testing, and binding core prediction settings highlighted the superiority of our proposed ConBoTNet over current state-of-the-art methods. Data distribution analysis in the latent feature space demonstrated that supervised contrastive learning can aggregate MHC-II-peptide samples with similar affinity labels and learn common features of similar affinity. Additionally, we interpreted the trained neural network by associating the attention weights with peptides and innovatively find both well-established and potential peptide motifs. This work not only introduces an innovative tool for accurately predicting MHC-II peptide affinity, but also provides new insights into a new paradigm for modeling essential biological interactions, advancing data-driven discovery in biomedicine. © 2024, The Authors. All rights reserved.

关键词： Peptides

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Utilization of ornamental rock waste as a catalytic support for α-MoO₃ in biodiesel production

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Scientific reports 2025年第1期15卷 19152页

作者： H B Sales M S Oliveira A L Silva H L Pereira A C F M Costa M C F Alves Laboratory of Ceramic Materials Synthesis (LabSMac) Graduate Program in Materials Science and Engineering (PPGCEMat) Academic Unit of Materials Engineering (UAEMa) Federal University of Campina Grande (UFCG) Rua Aprígio Veloso 882 Bodocongó 58.429-900 Campina Grande PB Brazil. herbet_bezerra@***. Laboratory of Ceramic Materials Synthesis (LabSMac) Graduate Program in Materials Science and Engineering (PPGCEMat) Academic Unit of Materials Engineering (UAEMa) Federal University of Campina Grande (UFCG) Rua Aprígio Veloso 882 Bodocongó 58.429-900 Campina Grande PB Brazil. Laboratory of Inorganic Materials for Environmental Catalysis Research Department of Chemistry (MATIPECA) Graduate Program in Chemistry (PPGQ) DQ State University of Paraíba (UEPB) Rua Baraúnas 351 Universitário 58.429-500 Campina Grande PB Brazil.

This study aimed to explore the use of ornamental stone waste as a support for the α-MoO₃ catalyst to develop efficient and sustainable heterogeneous systems for biodiesel production. The catalysts were characterized using physicochemical techniques including X-ray diffraction with Rietveld refinement, FTIR and Raman spectroscopy, scanning electron microscopy with EDS, transmission electron microscopy, nitrogen adsorption/desorption (BET method), particle size distribution, ammonia temperature-programmed desorption (TPD-NH₃), magnetic measurements, and gas chromatography to analyze simultaneous transesterification/esterification (TES) reactions and quantify methyl and ethyl esters. XRD patterns revealed crystalline phases such as mica-biotite, ferro-tschermakite, albite, quartz, and iron-magnesium silicates-components of the catalytic support-as well as orthorhombic α-MoO₃ phases, also confirmed in the heterogeneous systems. FTIR and Raman analyses showed characteristic vibrational bands, while SEM images displayed irregular agglomerates, corroborated by TEM. Nitrogen adsorption isotherms indicated mesoporous structures with surface areas ranging from 0.615 to 3.87 m²/g. Particle size analysis showed D₅₀ values between 5.02 and 20.00 μm, with total acidity ranging from 77.0 to 245 µmol/g of NH₃. Magnetic tests indicated ferrimagnetic behavior. The catalytic performance confirmed the effectiveness of the waste as a support for α-MoO₃, particularly in the system containing 40% Mo ions (40%σ-MoO₃:Waste), which achieved conversions between 78% and 95%. These findings highlight the environmental and technological potential of the studied catalysts, reinforcing the economic viability and ecological relevance of reusing industrial waste in the sustainable production of biodiesel from waste oils.

关键词： And sustainability Green technology Heterogeneous catalysis Industrial waste MoO₃ Waste oils

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