Article
Chemistry, Applied
Nisa V. Salim, Xing Jin, Srikanth Mateti, Karamat Subhani
Summary: The study successfully prepared carbon fibers with hierarchical porous designs, high conductivity, and large surface area, showing promising potential for multifunctional applications such as capacitors and adsorbents.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Materials Science, Ceramics
Huihui Zhang, Huan Liu, Haibo Wu, Ming Yuan, Jian Chen, Xiao Yang, Xuejian Liu, Zhengren Huang
Summary: This study reports the X-band microwave absorbing properties of gelcasted SiC-Si3N4 ceramics with different hierarchical pore structures for the first time. The effects of pore structures, sample thickness, and temperature on the complex permittivity and microwave absorption performance of SiC-Si3N4 ceramics were systematically investigated. The results indicate that the introduction of appropriate hierarchical pore structure improves the absorbing performance of the material.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Jyotsna Ramachandran, Mingxuan Lu, Pedro J. Arias-Monje, Mohammad Hamza Kirmani, Narayan Shirolkar, Satish Kumar
Summary: Blends of PAN with different sacrificial polymers were processed to obtain porous carbon fibers with varying pore sizes. Despite their porosity, some of the porous carbon fibers showed comparable tensile strength to non-porous carbon fibers, while exhibiting higher tensile modulus and electrical conductivity.
Article
Polymer Science
Hoan Ngoc Doan, Shotaro Tagami, Phu Phong Vo, Masaki Negoro, Wataru Sakai, Naoto Tsutsumi, Kazuyoshi Kanamori, Kenji Kinashi
Summary: In this study, cross-linked porous polyimide fibers were prepared using centrifugal spinning, and the influence of different parameters was evaluated. The obtained fibers exhibited low thermal conductivity, high thermal stability, and flexibility.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Xianggui Zhang, Xianglong Li, Antuo Wang, Bin Yang, Teng Hou, Yishen Lu, Jing Zhou
Summary: A porous and superhydrophobic polytetrafluoroethylene (PTFE) fibrous membrane was successfully prepared by centrifugal spinning and heat treatment, demonstrating high water contact angle and low water sliding angle. The protrusions on the surface of the PTFE fibers can be tuned by adjusting the heat treatment extent and potato amylose content, showing great potential for oil/water emulsions separation with a high oil removal rate.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Iris Kruppke, Fawzy Sherif, Mirko Richter, Chokri Cherif
Summary: This article presents an approach to design porous carbon fiber precursors using polyacrilonitrile and nanocellulose additives. Two stretching processes and four different additive concentrations were applied. The results showed that the treated carbon fibers had increased specific surface area and pore volume compared to the reference fibers, but their mechanical properties were negatively affected by the additives and stretching process.
Article
Chemistry, Physical
Shaohui Wang, Yuzhe Liu, Hua Wang, Xiaowen Wang, Lin Li, Tonghua Wang
Summary: In this study, template-free synthesis of porous carbon fibers with tunable mesopores was achieved using discarded aramid fibers. The resulting porous carbon fibers exhibited high specific surface area, abundant tunable mesopores, and N/O enriched surface. The optimized porous carbon fiber showed exceptional specific capacitance and rate performance in a KOH electrolyte, as well as remarkable energy density and cycling stability in a Na2SO4 electrolyte.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Engineering, Environmental
Wei Shi, Song Chen, Yong Lin, Guangyong Zhang, Zefei Peng, Zelin Liu, Hang Shi, Xueling Yan, Lan Liu
Summary: By adjusting the structure and elastic modulus of the fibers, researchers have developed piezoresistive fibers with the highest sensitivity and demonstrated their potential in strain sensing, humidity sensing, and gas sensing.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Polymer Science
Ainhoa Alvarez-Gomez, Jiayin Yuan, Juan P. Fernandez-Blazquez, Veronica San-Miguel, Maria B. Serrano
Summary: The use of block copolymers as sacrificial templates for obtaining porous carbons as electrode materials has been demonstrated in this study. The resulting porous carbon fibers showed superior pore formation capability and exhibited a hierarchical porous structure, with high surface area and outstanding electrochemical performance.
Article
Chemistry, Multidisciplinary
Feiqiang Guo, Yinbo Zhan, Xiaopeng Jia, Huiming Zhou, Shuang Liang, Lin Qian
Summary: A novel approach was developed to synthesize three-dimensional porous carbons as electrode materials for supercapacitors using Sargassum as the precursor, KOH activation, and nitrogen-doping with melamine. The resulting N-0.67@SAC exhibited high specific surface area, good rate capacity, and excellent cycling stability, with nitrogen-doping improving wettability and introducing pseudocapacitance.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Andres Eduardo Romero Valenzuela, Chayanaphat Chokradjaroen, Satita Thiangtham, Nagahiro Saito
Summary: In this study, hierarchical porous carbon fibers (HCFs) were synthesizd and evaluated for their CO2 adsorption capacity. The results showed that the post treated HCFs achieved a higher CO2 uptake at 273K compared to solution plasma carbon (SPC).
Article
Materials Science, Multidisciplinary
H. Foratirad, M. G. Maragheh, H. R. Baharvandi
Summary: Titanium carbide ceramics with high porosity were successfully fabricated and the mechanical properties and microstructure were controlled by adjusting the parameters of the suspension. The results showed that the best mechanical properties and homogeneous microstructure could be achieved under certain conditions.
Article
Materials Science, Multidisciplinary
Azusa Togo, Shiori Suzuki, Satoshi Kimura, Tadahisa Iwata
Summary: This study synthesized biodegradable regenerated fibers from alpha-1,3-glucan using in vitro enzymatic polymerization. The fibers produced with ethanol in the coagulation bath showed improved mechanical properties and well-oriented crystalline structures.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Materials Science, Composites
Xinrong Jiang, Shuxuan Qu, Zhengzhong Shao, Wenbin Gong, Gengheng Zhou, Weibang Lu
Summary: The study revealed that the dispersion time significantly affects the microstructure and mechanical properties of CNT solutions and spun fibers. Increasing dispersion time leads to smaller CNT bundle size and length, resulting in improved homogeneity of CNT dispersions. The mechanical properties of CNT fibers initially increase and then decrease with dispersion time.
COMPOSITES COMMUNICATIONS
(2021)
Article
Materials Science, Ceramics
Xiang Li, Si Li, Ziyang Yin, Wuyang Shi, Mengya Tao, Wei Liu, Zhengxia Gao, Chengliang Ma
Summary: In this study, mullite porous ceramics with high apparent porosity were successfully prepared using a non-toxic and economical poly-gamma-glutamic acid (gamma-PGA) gelling system and the foaming method. The effects of the foaming agent and sintering temperature on the microstructure, apparent porosity, and mechanical properties of mullite porous ceramics were investigated. The prepared mullite porous ceramics exhibited excellent properties and were validated for potential use as catalyst supports.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Rafael Salomao, Veridiana Lopes Ferreira, Ligia M. M. Costa, Ivone Regina de Oliveira
CERAMICS INTERNATIONAL
(2018)
Article
Materials Science, Multidisciplinary
Leandro Fernandes, Rafael Salomao
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2018)
Article
Materials Science, Multidisciplinary
Rafael Salomao
ADVANCES IN MATERIALS SCIENCE AND ENGINEERING
(2018)
Article
Materials Science, Ceramics
Ligia M. M. Costa, Jose Sakihama, R. Salomao
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2018)
Article
Materials Science, Multidisciplinary
Leandro Fernandes, Renata Aquino de Carvalho, Andre Capaldo Amaral, Edison Pecoraro, Rafael Salomao, Eliane Trouatti
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2019)
Article
Materials Science, Ceramics
R. Salomao, V. C. Pandolfelli
CERAMICS INTERNATIONAL
(2020)
Article
Materials Science, Ceramics
Rafael Salomao, Mirian A. Kawamura, Ana B. Emilio, Jose Sakihama, Ana M. Segadaes
Summary: Calcium hexaluminate (CA6) is a densification-resistant material used as high-temperature thermal insulators. This study investigated the combination of calcined alumina and calcium aluminate cement (CAC) in forming porous CA6. Different porogenic events were observed at various temperatures, with porosity content controlled by CAC content and curing conditions.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Rafael Salomao, Leandro Fernandes, Natalia C. M. Spera
Summary: The study investigated the combined effects of variable SiO2/Al2O3 ratios and the presence of low-melting-point impurities on the physical properties and microstructure of in situ alumina-mullite ceramics. Different microsilica loads were found to hinder densification of the matrix, favor grain growth events, and significantly affect the amount of liquid phases formed, leading to different microstructures and levels of flexural strength and total porosity in the samples.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
R. Salomao, C. C. Arruda, V. C. Pandolfelli, L. Fernandes
Summary: By varying the ratios of Mg(OH)2-Al2O3 and sintering temperature, structures with tailored porosity, compression strength, thermal conductivity, and pore sizes in the range of 15 μm were obtained, suitable for high-temperature materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
B. P. Bezerra, A. P. Luz, R. Salomao, V. C. Pandolfelli
Summary: Polymeric fibers can act as drying additives for refractory compositions to enhance their explosion resistance. The changes in fiber morphology during softening and melting process have a significant impact on the drying behavior of refractory castables.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
A. P. Luz, M. H. Moreira, R. Salomao, M. A. L. Braulio, V. C. Pandolfelli
Summary: This article focuses on the drying process and its influencing factors of monolithic dense refractories, including the effects of drying agents on material microstructure and the related effects of heating program design. Recent advances indicate that appropriate drying additives and engineering techniques can improve the safety and stability of refractory materials.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Rafael Salomao, Leandro Fernandes
Summary: The hydroxylation behavior of magnesia (MgO) has been extensively studied in dilute suspensions, but its effects on concentrated systems have not been systematically analyzed. In this study, the hydroxylation behavior of different sources of magnesia in aqueous suspensions with various solids concentrations was investigated. The results showed that the hydroxylation degree, volumetric expansion, and maximum internal temperature during curing were more pronounced in suspensions containing caustic magnesia. Despite the small quantity of hydroxylation products formed, compositions with higher solid loads had higher reaction yield levels. Significant differences in the microstructure of the products were observed and attributed to the ions' mobility towards crystallization nuclei.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2023)
Article
Materials Science, Ceramics
Rafael Salomao, Isabela S. Martinatti, Leandro Fernandes, Andreas Sundblom, Peter Greenwood, Paulo R. T. Tiba
Summary: This study used a novel aqueous dispersion of colloidal silica, whose particles' surfaces were modified with an epoxysilane-based coupling agent, to combine with fine MgO powder, generating self-flowing MgO-colloidal silica suspensions of excellent workability. After curing, a dense magnesium silicate hydroxide hydrate protective coating formed over MgO particles, hindering their hydroxylation and volumetric expansion. During thermal treatment, softened silica particles promoted densification. The microstructure after sintering comprised dense MgO grains surrounded by thin layers of forsterite.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Engineering, Biomedical
P. R. Minim, L. J. de Azevedo-Silva, B. M. Ferrairo, L. F. Pereira, C. A. Goulart, R. S. Monteiro-Sousa, P. N. Lisboa, C. A. Fortulan, R. Saloma, A. F. S. Borges, H. Rubo
Summary: This study assessed the effects of adding polyvinyl butyral (PVB) in combination with two sintering methods on the mechanical properties of polycrystalline bovine HA bioceramics. The results showed that samples sintered using the conventional method without binders exhibited the best mechanical properties.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Materials Science, Ceramics
Rafael Salomao, Leandro Fernandes, Luiz Carlos Simao
Summary: This paper introduces a novel microporous MgO-based thermal insulator with temperature-resistant microporous structure. The controlled packing flaws were introduced among highly asymmetric and porous particles during uniaxial pressing. The study shows that thermal treatments have little effect on the microporous microstructure generated during pressing. The thermal conductivity, total porosity, and compression strength of the samples vary at different temperatures.
