Article
Chemistry, Physical
Tiago Araujo, Andrew J. Parnell, Gabriel Bernardo, Adelio Mendes
Summary: Carbon molecular sieve membranes were prepared by carbonizing a cellulose-based polymeric pre-cursor doped with urea. The addition of urea increased the structural disorder and pore volume of the membranes. This unique preparation method effectively allows tuning of the pore size for desired separations, with urea acting as a pore-forming agent. With the addition of 2.8 wt% urea, the permeability of the prepared carbon membrane to hydrogen was doubled, while maintaining selectivity and obtaining a permeability to oxygen of 333 barrer.
Review
Engineering, Chemical
Chong Yang Chuah, Tae-Hyun Bae
Summary: Carbon molecular sieve membranes (CMSMs) have attracted significant research attention due to their ability to overcome the trade-off limitation between permeability and selectivity in gas separation polymeric membranes. This review examines the critical aspects in the development of CMSMs based on polyimide precursors, including pre-treatment, pyrolysis, and post-treatment conditions. It also discusses the mass transfer mechanism, characterization methods, performances against the Robeson upper bound limit, pilot-scale applications, economic analysis, and challenges and perspective of CMSM-based gas separation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Katerina Setnickova, Tse-Chiang Huang, Ching-Ting Wang, Yi-Chen Lin, Sher Ling Lee, Guo-Liang Zhuang, Kuo-Lun Tung, Hui-Hsin Tseng, Petr Uchytil
Summary: This study investigates the importance of the intermediate layer in carbon molecular sieve membrane formation and its impact on gas separation performance. Experimental results show that preparation conditions significantly affect the structure and separation efficiency of CMS/TiO2 membranes, with the thickness of the intermediate TiO2 layer and the defect level of the carbon separation layer playing key roles in membrane performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Tae Hoon Lee, Farhad Moghadam, Jae Gu Jung, Yu Jin Kim, Ji Soo Roh, Seung Yeon Yoo, Byung Kwan Lee, Jin Hee Kim, Ingo Pinnau, Ho Bum Park
Summary: A versatile approach to fabricate hybrid CMS membranes with unique textural properties and tunable ultramicroporosity is proposed in this study. The HCMS membranes exhibit superior gas separation performances compared to conventional polymers and CMS membranes, especially for closely sized gas pairs. This development demonstrates practical feasibility for use in industrial mixed-gas operation conditions.
Article
Engineering, Chemical
Shan Xu, Ning Zhao, Lei Wu, Shuanyan Kang, Zhiguang Zhang, Guolong Huo, Zhongde Dai, Nanwen Li
Summary: Optimizing the microstructure of carbon molecular sieve (CMS) membranes can improve gas separation performance. This study demonstrates that using a thermally crosslinkable precursor can enhance the permeability and selectivity of CMS membranes.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Guoxiong Deng, Yilei Wang, Xueping Zong, Jiangzhou Luo, Xuezhen Wang, Chunxue Zhang, Song Xue
Summary: The study shows that esterification of binaphthol-based polyimide affects the pore structure and gas permeability of the derived carbon membranes.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Engineering, Chemical
Chong Yang Chuah, Junghyun Lee, Yueping Bao, Juha Song, Tae-Hyun Bae
Summary: Nano-sized PS-MFI, ETS-10 and SAPO-34 zeolites were used as CO2-selective fillers in high-performance mixed-matrix carbon molecular sieve membranes for CO2/N-2 separation. The in-house polyimide precursor ODPA-TMPDA was employed for the membranes, leading to improved gas permeability. Zeolite-filled CMSMs showed enhanced CO2 permeability and selectivity, especially with SAPO-34 outperforming the Robeson upper bound for CO2/N-2 separation.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Applied
Jing Nie, Norimasa Yoshizawa, Kazuhiro Tanaka
Summary: This study investigates the effect of toluene vapor modification on the gas permeability and selectivity of CMS membranes. The performance of the CMS membranes can be controlled by adjusting the pyrolysis temperature and duration of toluene vapor addition, resulting in higher selectivity for H2/CO2, H2/N2, and H2/CH4 gas pairs.
JOURNAL OF POROUS MATERIALS
(2022)
Article
Engineering, Chemical
Yonghong Wang, Lecheng Sheng, Xinru Zhang, Jinping Li, Rong Wang
Summary: By growing a ZIF-8 layer on the Fe3O4 surface, hybrid carbon molecular sieve (HCMS) membranes with ordered microporous structure were fabricated, which exhibited excellent gas separation performance and aging resistance.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Materials Science, Ceramics
Yosuke Nakamura, Sachiko Matsushita, Akira Nakajima, Toshihiro Isobe
Summary: Carbon-based membranes were synthesized on porous alumina via a hydrothermal method from aqueous glucose solutions. The hydrothermal treatment time and temperature were evaluated to study their effects on the microstructure of the membranes. The obtained carbon membranes were found to be deposited both on the surface and in the interiors of the porous alumina. The carbon membrane prepared at a hydrothermal treatment of 200 degrees C for 5 hours showed few pinholes and consisted of amorphous carbon with hydroxy groups. Gas transmission rate measurements indicated that the membrane had a pore size of approximately 0.3 nm and exhibited high selectivity for various gas mixtures.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Chemical
Yuhe Cao, Kuang Zhang, Chen Zhang, William J. Koros
Summary: This study presents an economically viable method to fabricate composite nanoparticle-containing carbon molecular sieve hollow fiber membranes with excellent gas separation performance through a coating process.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
F. Radmanesh, A. Tena, E. J. R. Sudholter, N. E. Benes
Summary: Highly selective and thermally stable thin-film composite membranes for hot hydrogen sieving were prepared using a non-conventional polymerization method. The membranes exhibited excellent hydrogen permselectivity and thermal stability, making them promising for high-temperature industrial gas separations and high-pressure hydrogen storage at ambient temperature.
MATERIALS TODAY NANO
(2023)
Article
Chemistry, Multidisciplinary
Zhongyun Liu, Wulin Qiu, William J. Koros
Summary: This study investigates the structure evolution of CMS membranes during physical aging using a combined dual-mode sorption and transport model, revealing that aging primarily affects diffusion and leads to changes in pore structure and performance. These insights offer strategies for controlling physical aging and tuning the separation performance of CMS membranes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Chemical
Linfeng Lei, Arne Lindbrathen, Magne Hillestad, Xuezhong He
Summary: Asymmetric carbon molecular sieve (CMS) membranes prepared from cellulose hollow fiber precursors show excellent separation performance and high stability for H2/CO2 separation. A two-stage carbon membrane system is found to be technologically and economically feasible for producing high-purity H2. It is suggested that higher operating temperatures are needed to achieve higher purity hydrogen.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Haojie Li, Bingyu Zhao, Yuxiu Yu, Yaodong Liu
Summary: Silicon atoms in the form of siloxane-Cl were introduced into a polyimide precursor membrane to improve the compatibility with carbon molecular sieve membrane (CMSM). By varying the content of siloxane-Cl, the composite membrane showed improved gas separation performance. The incorporation of silicon in CMSMs in proper forms significantly improved their molecular sieving and anti-aging performances.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Jie Sheng, Jingshan He, Dun Ma, Yuanbo Wang, Wu Shao, Tian Ding, Ronghao Cen, Jingwen He, Zhihao Deng, Wenjun Wu
Summary: This study presents an innovative approach to improve the photovoltaic conversion characteristics and stability of perovskite solar cells through carbon electrode interface modification. By in-situ polymerization and carbonization on the surface of nano-graphite, a dendritic structure carbon electrode is formed, reducing the work function and aligning the energy levels with perovskite. This leads to improved charge and hole collection efficiency, resulting in increased photovoltaic conversion efficiency. Furthermore, the modified carbon electrode-based perovskite solar cells exhibit exceptional stability, maintaining high efficiency even without encapsulation.
Article
Chemistry, Physical
Guodong Shi, Jian Song, Xiaoxiao Tian, Tongtong Liu, Zhanjun Wu
Summary: This study demonstrates the improvement of mechanical properties and reduction of coefficient of thermal expansion (CTE) in graphene oxide (GO)/epoxy (EP) nanocomposites by enhancing the interface between GO and EP through functionalization and incorporating rigid-flexible interphases. The results reveal that the SiO2-PEA-GO hybrid exhibits better strengthening and toughening effects, as well as lower CTE, compared to the PEA-GO hybrid due to the presence of rigid-flexible interfaces with higher bonding strength and better energy dissipation mechanisms. Additionally, the nanocomposites with longer polyetheramine (PEA) molecules in the rigid-flexible interphases demonstrate higher strength and toughness, while maintaining a lower CTE. This work provides a promising strategy for constructing adjustable flexible-rigid interfacial structures and offers potential in developing GO/EP nanocomposites with high mechanical properties and low CTE.
Article
Chemistry, Physical
Rafal Janus, Sebastian Jarczewski, Jacek Jagiello, Piotr Natkanski, Mariusz Wadrzyk, Marek Lewandowski, Marek Michalik, Piotr Kustrowski
Summary: In this study, a facile procedure for the synthesis of CMK-1 and CMK-2 carbon replicas was developed. The method utilizes basic laboratory equipment and a renewable carbon source, and operates under mild conditions. The resulting carbon mesostructures exhibit exquisite replication fidelity and structural homogeneity, making them suitable for applications in various fields.
Article
Chemistry, Physical
Anqi Wang, Connor J. MacRobbie, Alex Baranovsky, Jean-Pierre Hickey, John Z. Wen
Summary: In this study, a novel polymer-free nanothermite aerogel with a wide range of nanoparticle loading was fabricated via a new additive manufacturing process. The SEM images showed a unique porous structure formed by extra thin rGO sheets, wrapping individual nanothermite clusters. The DSC-TGA results and high-speed combustion videos confirmed the enhanced energetic performance of the printed specimen.
Article
Chemistry, Physical
Wanze Wu, Misheng Zhao, Shiwei Miao, Xiaoyan Li, Yongzhong Wu, Xiao Gong, Hangxiang Wang
Summary: Superhydrophobic solar-driven interfacial evaporator is an energy-efficient technology for seawater desalination, which is easily fabricated using robust photothermal superhydrophobic coating and substrate. The created bifunctional coating on the melamine sponge substrate shows stable and highly efficient photothermal and superhydrophobic performance for seawater desalination. This superhydrophobic solar-driven interfacial evaporator is expected to have wide applications in seawater desalination.
Article
Chemistry, Physical
Zichen Xiang, Zhi Song, Tiansheng Wang, Menghang Feng, Yijing Zhao, Qitu Zhang, Yi Hou, Lixi Wang
Summary: This study presents a co-electrospinning synthesis strategy to fabricate lightweight and porous Co@C composite nanofibres with wideband microwave attenuation capacity. The addition of MOF-derived Co additives enhances the low-frequency absorption performance.
Article
Chemistry, Physical
J. Snow, C. Olson, E. Torres, K. Shirley, E. Cazalas
Summary: This study investigates the use of a perovskite-based graphene field effect transistor (P-GFET) device for X-ray detection. The sensitivity and responsivity of the device were found to be influenced by factors such as X-ray tube voltage, current, and source-drain voltage. Simulation experiments were conducted to determine the dose rate and energy incident on the device during irradiation.
Article
Chemistry, Physical
Zuzana Jankovska, Lenka Matejova, Jonas Tokarsky, Pavlina Peikertova, Milan Dopita, Karolina Gorzolkova, Dominika Habermannova, Michal Vastyl, Jakub Belik
Summary: This study provides new insights into microwave-assisted pyrolysis of scrap tyres, demonstrating that it can produce microporous carbon black with potential application in xylene adsorption. Compared to conventional pyrolysis, microwave pyrolysis requires less time and energy while maintaining similar adsorption capacity.
Article
Chemistry, Physical
Max Bommert, Bruno Schuler, Carlo A. Pignedoli, Roland Widmer, Oliver Groning
Summary: A detailed understanding of the interaction between molecules and two-dimensional materials is crucial for incorporating functional molecular films into next-generation 2D material-organic hybrid devices. This study compares the energy level alignment of different-sized fullerenes on a Moire superstructure and finds that C-84 fullerenes can be either neutral or negatively charged depending on slight variations of the electrostatic potential. This discovery suggests a new path to achieve ambipolar charge transfer without overcoming the electronic gap of fullerenes.
Article
Chemistry, Physical
Yuanjing Cheng, Xianxian Sun, Ye Yuan, Shuang Yang, Yuanhao Ning, Dan Wang, Weilong Yin, Yibin Li
Summary: The dual-structure aerogel (GS) consisting of flexible silica fibers and graphene honeycomb structures exhibits excellent resilience, flexibility, and reliability. It also shows remarkable wave absorbing performance, making it an ideal candidate for microwave absorption applications such as flexible electronics and aerospace.
Article
Chemistry, Physical
Shuyu Fan, Yinong Chen, Shu Xiao, Kejun Shi, Xinyu Meng, Songsheng Lin, Fenghua Su, Yifan Su, Paul K. Chu
Summary: Graphene coatings are promising solid lubrication materials due to their mechanical properties. This study presents a new method for in situ deposition of high-quality graphene coatings on hard substrates using NiCo solid solution and competitive reaction strategies. The graphene coating deposited on substrates with deep NiCo solid solution demonstrates superior low-friction and durability.
Article
Chemistry, Physical
Mengdi Wang, Sanyin Qu, Yanling Chen, Qin Yao, Lidong Chen
Summary: The improved thermoelectric properties of conducting polymers are achieved by selectively capturing single-walled carbon nanotubes (SWNTs) in a conducting polymer film, leading to increased carrier mobility and reduced thermal conductivity. The resulting composite film exhibits significantly higher electrical conductivity and lower thermal conductivity compared to films with a mixture of SWNTs. This work provides a convenient and efficient method to enhance the thermoelectric properties of conducting polymers.
Review
Chemistry, Physical
Heng Wei, Weihua Li, Kareem Bachagha
Summary: This article reviews the research progress of carbon nanotube-based microwave absorbing materials (MAMs) in recent years, covering the fundamental theory, design strategies, synthesis methods, and future development directions.
Article
Chemistry, Physical
Chenguang Shi, Junlong Huang, Zongheng Cen, Tan Yi, Shaohong Liu, Ruowen Fu
Summary: This study developed a high-performance Li metal host material, which achieved dendrite-free Li deposition with a low nucleation overpotential and high Coulombic efficiencies through the combination of Ti3C2-g-PV4P sheets and Ag nanoparticles. The full cells assembled with the Li@host anode and LiFePO4 cathode exhibited high discharge capacity and excellent cycling stability, demonstrating a perspective design for future energy storage devices.
Article
Chemistry, Physical
Tomotaro Mae, Kentaro Kaneko, Hiroki Sakurai, Suguru Noda
Summary: A new partial prelithiation method for SiO/C-CNT electrodes was developed, which showed reduced irreversible capacity and achieved high energy densities with good reversibility. The method allows for precise control of the degree of prelithiation and is applicable to various chemistries.