Article
Materials Science, Ceramics
Yuqing Han, Youqing Wu, Sheng Huang, Hong Zhang, Zijun Liang, Xuebo Guan, Shiyong Wu
Summary: By adjusting the alkali catalyst content, the hydrophobically modified silica aerogels using Dimethyldiethoxysilane (DDS) exhibit excellent structure and performance, making them suitable for harsh and humid environments.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Physical
Mateus G. Masteghin, Ranilson A. Silva, David C. Cox, Denis R. M. Godoi, S. Ravi P. Silva, Marcelo O. Orlandi
Summary: Semiconducting metal oxides (SMOs) used in gas sensors are affected by factors such as film thickness, grain size, and grain-grain junctions in the active device volume, complicating analysis and optimization of sensor response. Nanostructured devices with a single element offer a platform to understand the correlation between surface stoichiometry and sensor response. In this study, nanofabricated devices containing SnO2 and Sn3O4 nanobelts of different thicknesses were used to estimate their response to NO2 exposure, revealing differences in Debye length and sensor signals based on surface properties.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Materials Science, Ceramics
Jiaqi Yao, Xiangdong Gao, Yongqing Wu, Xiang Zhao, Xiaomin Li
Summary: This study demonstrates a simple and effective method to prepare highly thermal resistant aluminum doped silica aerogel (ASA) via sol-gel and ambient pressure drying using water glass and aluminum chloride as precursors. The effects of the Al/Si molar ratio in the precursor, calcination temperature, and modifier type on the structure and heat resistance performance of ASA are investigated. The results show that the Al/Si ratio and calcination temperature significantly affect the properties of ASA at temperatures ranging from 600 to 1000 degrees C.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Yi Luo, Linfeng Yu, Jing Men, Junzong Feng, Yonggang Jiang, Liangjun Li, Guangzhao Qin, Jian Feng
Summary: A facile ambient-pressure-drying technology is developed for synthesizing Fe-N4 doped carbon aerogel with copolymer F127 as enhancement phase. The prepared carbon aerogel exhibits ultralow thermal conductivity and excellent mechanical behavior. Doping Fe-N4 can significantly enhance the anharmonicity of carbon-based materials, leading to a reduced lattice thermal conductivity by more than 10 times.
Article
Chemistry, Applied
Shengyuan Wang, Zhixiang Zhu, Ya Zhong, Jun Gao, Feng Jing, Sheng Cui, Xiaodong Shen
Summary: Hydrophobic SiO2 aerogels with superhydrophobic surfaces and low thermal conductivity are prepared using double silicon sources as co-precursors. The microstructure and chemical-physical properties of the aerogels treated at different temperatures are investigated. The TM and TE aerogels exhibit low thermal conductivity, high specific surface area, and good hydrophobicity, making them suitable for thermal insulation, catalysis, and environmental protection.
JOURNAL OF POROUS MATERIALS
(2023)
Article
Engineering, Manufacturing
Zipeng Guo, Ruizhe Yang, Tianjiao Wang, Lu An, Shenqiang Ren, Chi Zhou
Summary: This paper introduces a new method for manufacturing silica aerogel insulation material using direct ink writing technology, followed by room-temperature and ambient pressure drying. Compared with traditional supercritical drying and freeze-drying techniques, this method has significant advantages in manufacturing time and costs, and shows good thermal insulation performance.
JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Environmental
Selay Sert Cok, Fatos Koc, Nilay Gizli
Summary: This study demonstrated that silica aerogels modified with TMCS and MTMS exhibit good hydrophobicity, high adsorption capacity, and enduring adsorption property, making them promising candidates for oil/organic solvent clean up practices.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Hui Zhi, Xiaobo Zhang, Fengya Wang, Peng Wan, Liang Feng
Summary: The study developed a flexible pressure sensor using a MXene/polyaniline/bacterial cellulose (MXene/PANI/BC) aerogel, capable of monitoring subtle motion signals such as finger bending, wrist bending, and pulse beating, as well as being sensitive to NH3. Bluetooth wireless transmission allows real-time monitoring of pressure distribution on a mobile phone, making it an ideal candidate for e-skins.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Composites
Xin Li, Hao He, Qiang Liu, Chunxia Zhao, Hongbing Chen
Summary: In this study, a low-cost hydrophobic aerogel was successfully prepared by irradiation and ambient-drying method. Compared to freeze-drying, the aerogels prepared by ambient-drying showed higher specific surface area and improved pore size distribution, making it more suitable for grafting reactions.
COMPOSITES COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Jian Wei, Pinghua Zhu, Hao Sun
Summary: This paper reports a new method for synthesizing insulating aerogel using recycled solid waste coal gangue. The method reduces production costs and realizes high value-added utilization of solid waste. The wet gels derived from coal gangue were quickly dried using a solvent exchange/surface modification method, resulting in a nanostructured aerogel with high surface area and superior thermal insulation performance.
Article
Chemistry, Physical
Xiaoyong He, Bicheng Tang, Xuan Cheng, Ying Zhang, Liuying Huang
Summary: The study focuses on the preparation and characterization of methyltriethoxysilane based aerogel monoliths, which demonstrate excellent mechanical properties and efficient thermal insulation. Experimental data suggests that the aerogel monoliths exhibit a linear stress-strain response and a non-buckling failure mode under compression.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Applied
Jaya Sharma, Shivangi Shukla, B. K. Behera
Summary: Nanoscale silica aerogels have unique properties such as large surface area, low density, and high porosity, but limited electrical and thermal conductivity. Sol-gel method for synthesis is not efficient and costly, while ambient pressure drying method using methyltrimethoxysilane shows potential for commercialization. This method produces silica aerogels with extremely low bulk density and high specific surface area, exhibiting excellent chemical absorption and recyclability for substances like organic liquids and oils.
JOURNAL OF POROUS MATERIALS
(2023)
Article
Chemistry, Physical
Shixiang Zhou, Li Yao, Hui Mei, Konstantinos G. Dassios, Laifei Cheng, Litong Zhang
Summary: Chiral-rotating gas sensing structures composed of chemiresistive-sensitized SiCuOC have been proposed to reduce thermal expansion of gas sensors at high temperatures. The structures disperse thermal stress by heat-induced torsion, maintaining dimensional stability. The synergistic sensitization effect of the substrate and surface sensing layer results in high response/recovery speed and value, with long-term detection maintained. The structures exhibit low thermal expansion coefficient, high deformation resistance, and can perform gas detection under pressure and thermal loading.
CHEMISTRY OF MATERIALS
(2022)
Article
Engineering, Environmental
Pil Gyu Choi, Akihiro Tsuruta, Yoshitake Masuda
Summary: Detection and discrimination of gases are crucial in various fields and the demand for easy and fast detection of various gas substances is increasing. This study improved the sensing property by modifying carbon nanotubes (CNT) with nanosheet-type tin oxide (SnO2), resulting in superior sensing properties and improved selectivity for ammonia gas. The accuracy of ammonia gas classification was significantly increased when using the modified sensor in the sensor array, showing its potential for ammonia gas detection and discrimination.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Ceramics
Shuai Gao, Ting Yang, Shuning Liu, Kai Liu, Zeqi Cao, Wanjun Pang, Hongyi Jiang
Summary: In this study, a high-temperature resistant aluminum-doped silica aerogel (ASA) was successfully prepared using an inexpensive aluminum sol as the aluminum source. The effects of the Al/Si molar ratio and calcination temperature on the structure, morphology, and thermal stability of ASA were investigated. The addition of aluminum sol not only improved the strength of the aerogel skeleton but also inhibited the phase transition of silica, effectively enhancing the high-temperature resistance of the aerogel.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
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, Multidisciplinary
Swapnajit Mulik, Suprimkumar D. Dhas, Annasaheb Moholkar, Vinayak G. Parale, Hyung-Ho Park, Pramod A. Koyale, Vijay S. Ghodake, Dillip K. Panda, Sagar D. Delekar
Summary: The binary and ternary nanocomposites of Co3O4@Co/N-CNTs with Ag NPs and rGO were successfully synthesized using a wet chemical route. Among different compositions tested, a ternary nanocomposite with a stoichiometric ratio of 7.0:1.5:1.5 of Co3O4@Co/N-CNTs, Ag NPs, and rGO exhibited the highest specific capacitance. The optimized nanocomposite showed excellent electrochemical stability and achieved an energy density of 74.1 W h.kg-1 and a power density of 443.7 W.kg-1.
Article
Energy & Fuels
Chaeseon Hong, Minjae Kim, Jin-Gyu Lee, Qingyi Shao, Hong-Sub Lee, Hyung-Ho Park
Summary: Si-ZnO thin-film transistors were fabricated via atomic layer deposition (ALD) and then annealed in oxygen, resulting in improved electrical characteristics and lower power consumption.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(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
Nanoscience & Nanotechnology
Jinwoo Kim, Seenu Ravi, Kijun Kim, Yujin Choi, Hyung-Ho Park, Youn-Sang Bae
Summary: A novel porous covalent organic polymer catalyst with dual acid sites was developed for efficient esterification of levulinic acid with aliphatic alcohols. The catalyst exhibited high conversion and selectivity, and showed good recyclability.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
Minjae Kim, Jeong Yun Hwang, Dong-eun Kim, Taehwan Song, Kyu Hyoung Lee, Hyung-Ho Park
Summary: In this study, optimized atomic layer deposition (ALD) process parameters were used to deposit crystalline ZrO2 films. Crystalline characteristics of ZrO2 films were obtained by controlling the deposition temperature. The mixture of tetragonal and monoclinic phases of the ZrO2 films exhibited the highest corrosion resistance properties.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Environmental
Younghun Kim, Vinayak G. Parale, Taehee Kim, Sang-Hyun Kim, Haryeong Choi, Umakant M. Patil, Kazuyoshi Kanamori, Hyung-Ho Park
Summary: A novel metal coordination-assisted sol-gel method was developed for the synthesis of nanostructures with different architectures. The energy storage capacity was influenced by the composition-derived properties and structure-derived properties, which were controlled by the molar ratio of Zn/Co and the architecture of the nanostructures. The one-dimensional Zn-Co-S aerogel exhibited excellent electrochemical performance as a supercapacitor, with high specific capacitance, high-rate capability, and outstanding cyclic stability.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Chaeseon Hong, Minjae Kim, Byeong-Min Lim, Sunil Moon, Keonwook Kang, Ioannis Kymissis, Hong-Sub Lee, Hyung-Ho Park
Summary: In this study, cation and anion codoped ZnO thin films were prepared through atomic layer deposition, and the effects of different anion doping concentrations on the film properties were investigated. The codoped ZnO films showed reduced oxygen vacancy due to the codoping effect. However, the electrical and optical characteristics of the films exhibited contrasting tendencies depending on the type of anion element. These differences were attributed to the correlation effects between Si doping, reduced interfacial trap density, and anion doping, oxygen vacancy passivation. The behavior of each anion also varied in terms of charge carrier concentration.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Chemistry, Physical
Wiem Nasri, Zied Driss, Ridha Djebali, Kyu-Yeon Lee, Hyung-Ho Park, Abderazak Bezazi, Paulo N. B. Reis
Summary: This paper reports the thermal behavior of plain-woven CFRP composites using simulation at the micro-, meso-, and macro-scales. The numerical prediction of thermal conductivity was compared to experimental findings and analytical models, showing good results. A parametric study revealed that fiber volume fraction, temperature, and interphase fiber/matrix thickness significantly influenced the thermal conductivity of the composite, while matrix porosity had a relatively smaller impact.
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
Environmental Sciences
Vishwanath Hiremath, Jayun Heo, Hyung-Ho Park, Jeong Gil Seo
Summary: This study improves the crystallinity of aerogel materials and enhances their performance in photocatalytic applications. It is found that the phase transformation in TiO2 aerogel only occurs in specific phase combinations, and samples with rutile phase composition have higher oxygen vacancies. The developed TiO2 aerogel photocatalysts exhibit efficient degradation ability for dyes.
ENVIRONMENTAL 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)
Article
Chemistry, Inorganic & Nuclear
Mahsa Saberian, Alireza Nezamzadeh-Ejhieh
Summary: CuO was successfully supported on clinoptilolite nanoparticles (NCP) via ion exchange and calcination, forming CuO-NCP photocatalysts. CuO-NCP exhibited enhanced photocatalytic activity towards tetracycline (TC), and the best degradation performance was achieved under optimal conditions (25 ppm TC solution, pH 4.8, and 0.5 g/L catalyst).
SOLID STATE SCIENCES
(2024)