Article
Multidisciplinary Sciences
Jingran Guo, Shubin Fu, Yuanpeng Deng, Xiang Xu, Shujin Laima, Dizhou Liu, Pengyu Zhang, Jian Zhou, Han Zhao, Hongxuan Yu, Shixuan Dang, Jianing Zhang, Yingde Zhao, Hui Li, Xiangfeng Duan
Summary: This study reports a multiscale design of hypocrystalline zircon nanofibrous aerogels with a zig-zag architecture, which exhibits exceptional thermomechanical stability and ultralow thermal conductivity at high temperatures. The aerogels have a near-zero Poisson's ratio and thermal expansion coefficient, ensuring excellent structural flexibility and thermomechanical properties. By deliberately entrapping residue carbon species, the researchers successfully reduce thermal radiation heat transfer and achieve one of the lowest high-temperature thermal conductivities among ceramic aerogels.
Article
Materials Science, Multidisciplinary
Dorota Aniszewska, Marek Rybaczuk
Summary: This paper investigates the mechanical properties of silica aerogels using the Movable Cellular Automata (MCA) method. The density and porosity range, as well as the relationship between elastic modulus and density, were simulated. The results demonstrate that the MCA method is suitable for exploring the mechanical properties of aerogels.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Ceramics
Lei Su, Min Niu, Mingzhu Li, De Lu, Pengfei Guo, Lei Zhuang, Kang Peng, Hongjie Wang
Summary: Ceramic aerogels have attractive properties for applications in various fields due to their high porosity, low density, high specific surface area, low thermal conductivity, and thermal stability. However, the brittleness of conventional ceramic aerogels hinders their practical use. Resilient ceramic aerogels have overcome the brittleness issue but still exhibit brittleness under tensile stress and limited load-bearing ability. In this short review paper, strategies for modifying the mechanical properties of resilient ceramic aerogels are discussed, including the deformation and moving ability of nanowire building blocks and the deformation resistance provided by the aerogel architecture. Perspectives for further modification are also explored.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Zhen Luo, Xinhai Zhang, Jun Zhao, Ruixue Bai, Chunyu Wang, Yuanhao Wang, Dong Zhao, Xuzhou Yan
Summary: Mechanical bonds have been used to construct mechanically interlocked aerogels (MIAs) with adaptivity and multifunctionality. However, fabricating MIAs with precise chemical structures and dynamic features is still challenging. In this study, we present MIAs carrying dense [2]rotaxane units, which provide stability and flexibility to the aerogel network. The chemical structure of [2]rotaxane allows for the fabrication of precise and full-scale mechanically interlocked networks using diverse solvents. Furthermore, the dynamic nature of [2]rotaxane allows for modulation of the morphologies and mechanical performances of MIAs under chemical stimuli. We hope that understanding the structure-property relationship in MIAs will contribute to the development of mechanically interlocked materials and provide new opportunities for constructing smart materials with multifunctionalities.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Ceramics
Bartosz Babiarczuk, Daniel Lewandowski, Krzysztof Kierzek, Jerzy Detyna, Walis Jones, Jerzy Kaleta, Justyna Krzak
Summary: The development of silica aerogels with controlled mechanical properties is essential for practical applications. Synthesis of native silica aerogels was achieved using the sol-gel method and the alkoxide precursor of silica (TMOS). This study investigated the influence of three synthesis parameters, namely TMOS concentration, catalyst concentration, and solvents (MeOH, EtOH, IPA), on the gel point, shrinkage, and mechanical properties of the aerogels. Structural studies revealed how these synthesis parameters affected the spatial network and elasticity of the aerogels. The analysis demonstrated that the catalyst concentration was the most significant parameter, as it led to a significant increase in Young's modulus (E) without affecting the bulk density (rho), possibly due to an increase in specific surface area and bond diameter between secondary particles in the aerogel.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Review
Engineering, Environmental
Cynthia E. Ibarra Torres, Thelma E. Serrano Quezada, Oxana V. Kharissova, Boris I. Kharisov, Ma. Idalia Gomez de la Fuente
Summary: This paper reviews pristine, hybrid or composite aerogels and xerogels based on carbon allotropes, highlighting their preparation methods, properties and applications as sorbents for organic liquids. Carbon aerogels exhibit exceptional properties such as high specific surface area, super-compressibility, and high adsorption capacity, making them excellent options for various adsorbent purposes. The use of natural sources for producing carbon-containing aerogels is also discussed as an inexpensive and renewable alternative.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Jannatul Dil Afroze, Liyong Tong, Md Jaynul Abden, Ziwen Yuan, Yuan Chen
Summary: Hierarchical honeycomb graphene aerogels reinforced by functionalized carbon nanotubes demonstrate outstanding mechanical and electrical properties, making them promising for applications in flexible and wearable electronics. The synergic effects of graphene and carbon nanotubes provide these aerogels with low density, high compressive strength, excellent elasticity, creep resistance, wide temperature tolerance, high electrical conductivity, and superb electromechanical sensing ability. The optimized aerogel can also be applied in sensors to capture human movements, showcasing its potential in various fields.
Article
Chemistry, Applied
Michal Marszewski, Ali Dashti, Patricia E. McNeil, Maggie Fox, Vivian Wall, Danielle M. Butts, Sophia C. King, Glareh N. Kashanchi, Sarah H. Tolbert, Bruce Dunn, Laurent Pilon
Summary: This study reports and analyzes the effective Young's modulus and hardness of nanoparticle-based silica aerogels and xerogels for the first time. It was found that the effective hardness is linearly proportional to the effective Young's modulus. Deposition of an alumina coating was demonstrated as a way to increase the hardness of these mesoporous monoliths.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Beatriz Merillas, Fernando Villafane, Miguel Angel Rodriguez-Perez
Summary: This study synthesized a family of transparent polyisocyanurate-polyurethane (PUR-PIR) aerogels with interesting physical properties. By analyzing the textural properties, the influence of catalyst on the porous structures and densities was studied. The thermal conductivities were measured at different temperatures, revealing a clear trend between the initial formulation and the porous structure, with the lowest value found in the literature for aerogels based on this polymer matrix. The mechanical properties, including elastic modulus and stress at different strains, were also studied. The obtained aerogels exhibited tunable stiffness and significant elasticity. These super-insulating transparent PUR-PIR aerogels with tailored mechanical properties have a wide range of potential applications in various industries, such as energy, building, automotive, and aeronautical sectors.
Article
Chemistry, Physical
Rasul Abdusalamov, Christian Scherdel, Mikhail Itskov, Barbara Milow, Gudrun Reichenauer, Ameya Rege
Summary: The mechanical properties of silica aerogels are determined by their network connectivity, which was studied in this paper by generating computational models using the DLCA algorithm. The influence of model parameters on aerogel structures and deformation under mechanical loads was investigated, with a focus on structural and fractal properties. The DLCA models were analyzed for mechanical properties using finite element simulations, showing a correlation between elastic moduli and relative density.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Engineering, Environmental
Shengqi Ma, Chengyang Wang, Bing Cong, Hongwei Zhou, Xiaogang Zhao, Chunhai Chen, Dezhi Wang, Changwei Liu, Chunyan Qu
Summary: Polyimide aerogels (PIAs) are a new type of lightweight material that combines the thermal and mechanical properties of polyimides with the porous and lightweight properties of aerogels. This study reports on the synthesis of anisotropic polyimide aerogels with unprecedented behavior, including superior mechanical strength and thermal conductivity. These aerogels also show excellent compression behavior and thermal insulation performance at high temperatures.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Composites
Reyhaneh Reyhani, Ali Zadhoush, Nooshin Salman Tabrizi, Hossein Nazockdast, Mohammadreza Naeimirad
Summary: In this study, different weight ratios of CNT-doped carbon aerogel and carbon aerogel were used to reinforce epoxy nanocomposites. The nanocomposites showed enhanced properties compared to neat epoxy due to a high filler/matrix interaction from polymer chains penetrating the aerogel structure. Mechanical and thermal investigations showed significant improvements in properties, such as increased young modulus, tensile strength, elongation at break, E' at 40 degrees C, Tan delta, and Tmax.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Physical
Fuxing Zhao, Jundong Zhu, Tangping Peng, Hao Liu, Shengzhuo Ge, Huasheng Xie, Le Xie, Chongwen Jiang
Summary: The novel polyimide composite aerogel synthesized using functionalized clay halloysite nanotubes showed excellent thermal stability, low density, and high mechanical property, making it a promising thermal management material for practical and complex insulation applications.
APPLIED CLAY SCIENCE
(2021)
Article
Materials Science, Ceramics
Qi Wang, Puttavva Meti, Young-Dae Gong, Taehee Kim, Kyu-Yeon Lee, D. B. Mahadik, Hyung-Ho Park
Summary: Silica aerogels modified with low-polarizability functional groups via covalent bonding exhibited low dielectric constants, enhanced hydrophobicity, and improved mechanical properties.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Applied
Derong Lin, Yang Li, Yichen Huang, Wen Qin, Douglas A. Loy, Hong Chen, Qing Zhang, Zhijun Wu
Summary: In this study, citric acid modified cellulose nanocrystals (MCNC) and silica aerogel (SA) were used as reinforcing agents and added to polyvinyl alcohol (PVA) to prepare composite films. The results showed that the modified reinforcing agents were uniformly dispersed in the PVA matrix and formed a compact structure, improving the thermal stability and barrier properties of the films.
CARBOHYDRATE POLYMERS
(2022)
Article
Nanoscience & Nanotechnology
Yue Wang, Minjae Kim, Akendra Singh Chabungbam, Dong-eun Kim, Qingyi Shao, Ioannis Kymissis, Hyung-Ho Park
Summary: This study prepared La2Ti2O7-x thin film by atomic layer deposition on TiN substrate, and confirmed its clockwise forming-less resistive switching behavior. The resistive switching mechanism was achieved by voltage-driven and oxygen vacancy doping-controlled Mott transition.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Sarika B. Dhavale, Vithoba L. Patil, Satyajeet S. Patil, Dipali S. Patil, Rushikesh P. Dhavale, Hyung-Ho Park, Pramod S. Patil
Summary: Three dimensional hierarchical porous carbon was prepared from dry almond leaves (Terminalia catappa) by a two step process. The C-1000 carbon sample showed a surface area of 491.3 m(2) g(-1) and a specific capacitance of 212 F g(-1), while the AC-2 sample exhibited a specific surface area of 988.7 m(2) g(-1) and a specific capacitance of 394 F g(-1), with excellent cycling stability and mechanical flexibility, making it suitable for portable electronics application.
SUSTAINABLE ENERGY & FUELS
(2023)
Article
Chemistry, Physical
Sung-Jin Jung, Sang-Soon Lim, Byeong-Hyeon Lee, Sung Ok Won, Hyung-Ho Park, Seong Keun Kim, Jin-Sang Kim, Seung-Hyub Baek
Summary: Solid compounds with volatile elements often deviate from stoichiometric composition during thermal processes, leading to varied properties. Understanding the effect of process parameters on element volatility and how physical properties change with altered stoichiometry is crucial.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Hae-Noo-Ree Jung, Haryeong Choi, Sang-Hyun Kim, Wook Ki Jung, Hyung-Ho Park
Summary: This study investigates the effect of surfactants (non-ionic, cationic, or anionic) on alumina aerogels. The findings show that the charge-charge interactions between surfactants and cationic inorganic species in the aluminum precursor influence the pore structure of the aerogels. Controlling the surfactant concentration allows for control over the pore structure of the aerogels.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Physical
Bezawit Z. Desalegn, Reibelle Q. Raguindin, Vishwanath Hiremath, Hyung-Ho Park, Jeong Gil Seo
Summary: We report a bimetallic sulfide aerogel with hier-archical porosity for efficient Oxygen Evolution Reaction (OER) and pseudocapacitive charge storage. The aerogel facilitates fast charge and mass transportation, while sulfurization and secondary metal incorporation increase moderately binding active sites. The electrode exhibits excellent performance in terms of overpotential and capacitance, with increased capacity retention. XPS and NH3-TPD analysis reveal the importance of M delta+/M2/3+ ratio for OER performance and cyclability of pseudocapacitive charge storage.
JOURNAL OF POWER SOURCES
(2023)
Article
Engineering, Chemical
Vinayak G. Parale, Haryeong Choi, Taehee Kim, Varsha D. Phadtare, Rushikesh P. Dhavale, Kyu-Yeon Lee, Atanu Panda, Hyung-Ho Park
Summary: To enhance the mechanical strength and heavy metal ion adsorption of silica aerogels, a novel in situ sulfur-doping synthesis method was used. Three-dimensional monolithic silica aerogels were synthesized with an adaptable one-pot epoxy-thiol reaction. The cross-linked aerogels exhibited a strong silica hybrid network with high porosity and excellent compressive strength. These aerogels showed high adsorption capacity for heavy metals, particularly Pd2+. This method offers a new strategy for synthesizing sulfur-doped silica aerogels with enhanced properties for heavy metal removal.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Review
Chemistry, Multidisciplinary
Puttavva Meti, Qi Wang, D. B. Mahadik, Kyu-Yeon Lee, Young-Dae Gong, Hyung-Ho Park
Summary: Aerogels are highly porous materials prepared using sol-gel chemistry, which possess unique physical and chemical properties. They are potential candidates for diverse applications, such as thermal insulation and environmental remediation. However, the fragility and limited scale-up production hinder their routine use in daily life. Therefore, it is important to develop efficient and cost-effective methods for sustainable aerogel production.
Article
Chemistry, Physical
Jungyoon Cho, Soyeong Kwon, Jungtae Nam, Seawoo Moon, Jungeun Song, Seoyoung Lim, Eunseo Cho, Hyeong-Ho Park, Keun Soo Kim, Dong-Wook Kim
Summary: The integration of metal nanostructures and graphene has significant implications for optoelectronic device applications. In this study, heterojunctions of graphene and gold nanopillar arrays were fabricated, and their photocurrent characteristics were investigated, revealing the light-matter interaction mechanism between them.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Zhiquan Song, Moon-Ju Kim, Jun-Hee Park, Tae Gyeong Yun, Seong-Ju Hwang, Min-Jung Kang, Hyung-Ho Park, Jae-Chul Pyun
Summary: The thermal properties of SiO2 aerogels made from waterglass and TEOS were studied before and after coating with parylene using thermal and plasma deposition methods. The specific surface area of the aerogels was reduced after thermal deposition of parylene coating, while the reduction was smaller with plasma deposition. The thermal conductivity of the aerogels decreased after plasma deposition, indicating improved thermal insulation. However, the thermal conductivity changed in the opposite direction after thermal deposition. The deposition method of parylene had a significant impact on the thermal properties of the SiO2 aerogels.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Baharin Ali, Yousef Heider, Bernd Markert
Summary: Additive manufacturing of metallic components has become a viable option for series production, and can produce dense parts with excellent properties by processing metallic powder layer-by-layer. However, the occurrence of residual stresses poses a major challenge in this process, negatively impacting the strength and functionality of the produced components. This study utilizes a phase-field model and a thermo-elastoplastic model to simulate the multi-layer additive manufacturing process and evaluate the resulting residual stresses.
COMPUTATIONAL MATERIALS SCIENCE
(2024)
Article
Energy & Fuels
Vinod V. Patil, Sachin S. Pujari, Shraddha B. Bhosale, Sambhaji S. Kumbhar, Vinayak G. Parale, Chandrakant D. Lokhande, Jayavant L. Gunjakar, Mukund G. Mali, Dattakumar S. Mhamane, Hyung-Ho Park, Umakant M. Patil
Summary: This study developed binder-free hydrous cobalt phosphate thin film electrocatalysts using the SILAR method and observed the impact of annealing on the OER efficiency. The as-prepared hydrous cobalt phosphate demonstrated outstanding OER performance and overall water splitting ability.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Engineering, Chemical
Yujin Choi, Hyug Hee Han, Kwang Hyun Oh, Hyung-Ho Park, Seenu Ravi, Youn-Sang Bae
Summary: In this study, phosphite-based porous covalent organic polymers (PCOPs) with numerous aromatic and acidic phosphite sites, large surface areas, and hierarchical pore structures were synthesized and found to efficiently remove sulfur-containing PPCPs from water.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Chemistry, Physical
Rushikesh P. Dhavale, Vinayak G. Parale, Haryeong Choi, Taehee Kim, Kyu-Yeon Lee, Varsha D. Phadtare, Hyung-Ho Park
Summary: In this study, epoxy-thiol crosslinked silica aerogels were synthesized using a unique method, resulting in improved mechanical resilience for pollutant adsorption. By adjusting the ratio of catalysts and precursors, aerogels with different characteristics and properties were obtained.
APPLIED SURFACE SCIENCE
(2024)