Article
Engineering, Environmental
Tianhao Yu, Qiong Cai, Guoping Lian, Yinge Bai, Xiaochun Zhang, Xiangping Zhang, Lei Liu, Suojiang Zhang
Summary: The study of using ionic liquids encapsulated metal-organic frameworks ZIF-8 for CO2/CH4 separation mechanisms revealed that the original aperture configuration achieved the best separation performance, and the addition of ILs prevented large swing of the apertures. Furthermore, the effect of IL viscosity on the aperture configuration was investigated, showing that higher IL viscosity stabilized the original aperture configuration.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Mikio Hayashi, Dennis T. Lee, Matheus Dorneles de Mello, J. Anibal Boscoboinik, Michael Tsapatsis
Summary: Vapor-phase treatment of ZIF-8 membranes with manganese(II) acetylacetonate (Mn(acac)(2)) is shown to enhance permselectivity for various gas separations, with XPS analysis indicating the presence of Mn(acac)(2) on the membrane surface after treatment.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Yunchuan Pu, Mingang Zhao, Xu Liang, Shaoyu Wang, Hongjian Wang, Ziting Zhu, Yanxiong Ren, Zhiming Zhang, Guangwei He, Dan Zhao, Zhongyi Jiang
Summary: We demonstrate a COF-induced seeding strategy for fabricating MOF membranes, using COF substrate with uniform pore size and abundant functional groups. Charged COF nanosheets were designed to induce the formation of high aspect ratio ZIF-8@COF nanosheet seeds, which could be processed into a compact and uniform seed layer. The resulting ZIF-8 membranes exhibit ultrahigh C3H6/C3H8 separation performance and excellent long-term stability, and this strategy is also applicable to ultrathin ZIF-67 and UiO-66 membranes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Environmental
Xinjuan Zeng, Wei Zhou, Peizhang Zhou, Min Zhang, Cailong Zhou, Luxi Tan, Lin Wang
Summary: In this study, a leaf-like zeolitic imidazolate framework ZIF-L(Co) coated stainless steel mesh (ZIF-L(Co)@SSM) with superlyophobicity was fabricated through a simple one-pot method. By taking advantage of strong coordination interaction, the ZIF-L(Co)@SSM can be easily modified and achieve highly effective organic liquids separation with efficiency above 96%. This simple preparation route and excellent performance make the MOFs coated meshes suitable for various organic liquid separation practices.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Yuhang Zheng, Qiang Zhuang, Ying Ruan, Bingbo Wei
Summary: Zeolitic imidazolate framework-8 was synthesized in a containerless state using acoustic levitation, which affected the coordination connection of ligands and resulted in different particle size distribution compared to normal conditions. The influence of droplet evaporation during acoustic levitation synthesis was investigated using methanol as the solvent. Surface evaporation caused deformation, vibration, and shape oscillation of the droplets, leading to a decrease in particle size distribution.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Engineering, Environmental
Yinying Hua, Sunghwan Park, Gyeong Min Choi, Ho Jin Jung, Kie Yong Cho, Hae-Kwon Jeong
Summary: A novel one-step method for fabricating mixed-matrix membranes (MMMs) is reported in this study, which can overcome current scientific and engineering challenges and advance MMM commercialization. The method, called phase-inversion in sync with metal-organic framework (MOF) formation (PIMOF), involves simultaneous phase inversion of a polymer film and in-situ formation of ZIF-8 nanoparticles inside the polymer. The resulting MMMs exhibit unexpectedly high C3H6/C3H8 separation performances, mainly due to the high loading of ZIF-8 (>50 wt%) and the enhanced molecular sieving effect of sub-5 nm ZIF-8 filler nanoparticles.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Shiyuan Zhu, Quanjie Lin, Xiaopeng Huang, Liangji Chen, Lizhen Liu, Zizhu Yao, Shengchang Xiang
Summary: ZIF-8 membranes prepared on polyamide substrates demonstrated successful separation of acetylene/methane and acetylene/carbon dioxide mixtures with separation factors of 12.1 and 1.8 respectively. The separation mechanism for C2H2/CH4 is attributed to acetylene affinity and molecular sieving, while C2H2/CO2 separation is related to thermodynamic factors. This study marks the first successful separation of C2H2 from CH4 and CO2 by MOF membranes.
Article
Chemistry, Multidisciplinary
Dong-Ha Kim, Sanggyu Chong, Chungseong Park, Jaewan Ahn, Ji-Soo Jang, Jihan Kim, Il-Doo Kim
Summary: A hybrid design involving nanostructuring of oxides and passivation with gas filtration layers is proposed to overcome low surface reactivity in oxide semiconductor chemiresistors. Unique bi-stacked heterogeneous layers are introduced, leading to improved surface activity and remarkable sensing performances, especially under highly humid conditions.
ADVANCED MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Tiago J. Ferreira, Beatriz A. de Moura, Laura M. Esteves, Patricia M. Reis, Jose M. S. S. Esperanca, Isabel A. A. C. Esteves
Summary: This study investigates the impregnation of five ammonium-based ionic liquids (ILs) into the metal-organic framework (MOF) ZIF-8 for gas sorption applications. The produced IL@ZIF-8 composites are thermally stable and microporous. The acetate-based composites show high selectivity for CO2 adsorption.
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Chanjong Yu, Young Jae Kim, Jongbum Kim, Kiwon Eum
Summary: The control of structure, shape, and components in metal-organic frameworks is crucial in electrochemical applications. This study successfully controlled the morphology of ZIF-8 through systematic controls of synthesis variables and achieved modulation of adsorption and pore characteristics through partial substitution insertion of a new organic precursor.
Article
Chemistry, Multidisciplinary
Yurun Miao, Dennis T. Lee, Matheus Dorneles de Mello, Mohammed K. Abdel-Rahman, Peter Corkery, J. Anibal Boscoboinik, D. Howard Fairbrother, Michael Tsapatsis
Summary: Gas permeation properties of ZIF-8 membranes can be modified through electron beam irradiation, resulting in significant enhancements in ideal selectivity for both CO2/N-2 and CO2/CH4 with exposure times of less than 1 minute.
CHEMICAL COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Ziqi Zhou, Qiaomei Ke, Manni Wu, Ling Zhang, Ke Jiang
Summary: Metal-organic frameworks (MOFs) are efficient carriers for controlled drug delivery due to their large surface area and adjustable pore size. A new approach called Pore Space Partition (PSP) was used to effectively encapsulate and pH-controlled co-delivery of two guest molecules. ZIF-8's pore space was partitioned by encapsulating the large molecule ursolic acid (UA), and the remaining space was filled with the small molecule 5-fluorouracil (5-FU). This approach resulted in a high loading capacity of UA (12.80 wt %) and 5-FU (11.20 wt %) in the 5-FU&UA@ZIF-8. This smart carrier exhibited pH-controlled delivery of UA and surprisingly showed pH-responsive delivery of 5-FU after pore space partition. The co-delivery of 5-FU and UA demonstrated excellent anticancer performance against 4T1 cells.
ACS MATERIALS LETTERS
(2023)
Article
Electrochemistry
Bo Huang, Wen Zeng, Yanqiong Li
Summary: This study presents an effective strategy for the development of high-response volatile organic compounds (VOC) sensors by coating nano-metal oxides with metal-organic frameworks (MOF). The composite material, consisting of ZnO and ZIF-8, is able to form numerous pores and interface defects, enhancing the gas detection performance. The composite sensor exhibits optimal operating temperature at 350 degrees C and shows more than tripled response to 50 ppm gases compared to the ZnO sensor.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Analytical
Bo Huang, Wen Zeng, Yanqiong Li
Summary: ZnO nanorods were prepared using a simple method and then coated with porous ZIF-8 using a self-sacrificing water bath heating method. The successful synthesis of the composite material was confirmed using various detection methods. Gas-sensing experiments showed that the ZIF-8-coated ZnO with a core-shell structure exhibited better response due to the increased specific surface area and active sites.
Article
Nanoscience & Nanotechnology
Season S. Chen, Zhen-Jie Yang, Chia-Hao Chang, Hoong-Uei Koh, Sameerah Al-Saeedi, Kuo-Lun Tung, Kevin C-W Wu
Summary: In this study, a reliable one-step interfacial synthesis method was developed to prepare ZIF-8 membranes supported on porous alpha-Al2O3 disks for gas separation applications. The optimal synthesis conditions were determined through evaluating the growth of ZIF-8 membranes under various parameters. The as-synthesized ZIF-8 membranes exhibited high separation factor and CO2 gas permeance in CO2/N2 gas separation experiments.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2022)
Review
Chemistry, Physical
Ritesh Haldar, Christof Woell
Summary: Functional, porous metal-organic frameworks (MOFs) are a flexible and diverse class of crystalline, porous materials that have attracted attention for advanced applications. Hierarchical assemblies and creation of MOF/MOF heterointerfaces are important for exploiting photophysical properties. Layer-by-layer (lbl) methods offer advantages in manufacturing superstructures with length scales beyond the MOF pore size, allowing for extended isoreticular approach and compositional diversity in MOFs.
Article
Chemistry, Multidisciplinary
Stefan M. Marschner, Ritesh Haldar, Olaf Fuhr, Christof Woell, Stefan Braese
Summary: This study reported the successful synthesis of a series of 5,15-bis(4-ethoxycarbonylphenyl)porphyrin derivatives through Suzuki and Sonogashira cross-coupling reactions, fully characterized and systematically investigated for their suitability in synthesizing surface-anchored MOF thin films.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Physics, Condensed Matter
Mariana Kozlowska, Yohanes Pramudya, Marius Jakoby, Shahriar Heidrich, Liuyang Pan, Bryce S. Richards, Ian A. Howard, Christof Woell, Ritesh Haldar, Wolfgang Wenzel
Summary: This study demonstrates the impact of interchromophore interactions on the photophysical properties of a surface-anchored MOF, emphasizing the significance of chromophore interactions in material properties.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Chemistry, Multidisciplinary
Ritesh Haldar, Hongye Chen, Antoine Mazel, Dong-Hui Chen, Gaurav Gupta, Navneet Dua, Stephane Diring, Fabrice Odobel, Christof Woll
Summary: Efforts to achieve efficient high-yield wavelength conversion by stacking layers of chromophores have been unsuccessful so far. However, a significant improvement in optical conversion efficiency has been achieved through the use of chromophoric metal-organic framework heterolayers and an antenna doping strategy. The LR-FRET mechanism, previously reported to be highly anisotropic in neat materials, can be made more isotropic through doping strategies in optimized fabrication parameters.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Yi-Bo Tian, Nina Vankova, Peter Weidler, Agnieszka Kuc, Thomas Heine, Christof Woll, Zhi-Gang Gu, Jian Zhang
Summary: This research demonstrates the assembly of chromophores into well-ordered 1D arrays using MOF approach, resulting in highly sensitive photodetectors. The oriented MOF thin film-based high-sensitive photodetector shows potential for assembling organic semiconductors into regular arrays, creating a new avenue for optoelectronic device fabrication.
Article
Biochemistry & Molecular Biology
Tawheed Hashem, Elvia P. Valadez Sanchez, Evgenia Bogdanova, Anna Ugodchikova, Alaa Mohamed, Matthias Schwotzer, Mohamed H. Alkordi, Christof Woell
Summary: Metal-organic frameworks (MOFs) are intensively explored for novel applications and as alternatives to existing materials in thin film nanotechnologies. The stability of SURMOFs in harsh aqueous environments varies, with UiO-66-NH2 SURMOFs showing stability over a large window of pH values.
Article
Chemistry, Multidisciplinary
Sandeep Kumar, Yohanes Pramudya, Kai Mueller, Abhinav Chandresh, Simone Dehm, Shahriar Heidrich, Artem Fediai, Devang Parmar, Delwin Perera, Manuel Rommel, Lars Heinke, Wolfgang Wenzel, Christof Woll, Ralph Krupke
Summary: Graphene is inherently sensitive to vicinal dielectrics and local charge distributions, and can be used as a sensor; metal-organic frameworks can selectively adsorb specific molecular species; growing a surface-mounted metal-organic framework directly onto graphene field-effect transistors demonstrates a selective ethanol sensor with unprecedented shifts in Dirac point voltage response.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Alexei Nefedov, Ritesh Haldar, Zhiyun Xu, Hannes Kuehner, Dennis Hofmann, David Goll, Benedikt Sapotta, Stefan Hecht, Marjan Krstic, Carsten Rockstuhl, Wolfgang Wenzel, Stefan Brase, Petra Tegeder, Egbert Zojer, Christof Woell
Summary: The liquid-phase, quasi-epitaxial growth method is used to stack asymmetric organic compounds on inorganic substrates to create porous crystalline molecular materials without inversion symmetry, allowing for the integration of built-in electric fields. A new programmed assembly strategy based on metal-organic frameworks (MOFs) is described to facilitate the formation of crystalline, noncentrosymmetric space groups for achiral compounds. Integration of built-in electric fields into organic, crystalline, and porous materials offers possibilities for band structure engineering and tuning charge transfer for applications in organic electronics, photonics, and nonlinear optics.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Shujin Hou, Weijin Li, Sebastian Watzele, Regina M. Kluge, Song Xue, Shanshan Yin, Xinyu Jiang, Markus Doeblinger, Alexander Welle, Batyr Garlyyev, Max Koch, Peter Mueller-Buschbaum, Christof Woell, Aliaksandr S. Bandarenka, Roland A. Fischer
Summary: Materials derived from surface-mounted metal-organic frameworks (SURMOFs) show promising electrocatalytic performance for the oxygen evolution reaction (OER), with record-high electrocatalyst mass activities. The in situ self-reconstruction and self-activation of SURMOFs in alkaline aqueous electrolytes allow for the generation of NiFe (oxy)hydroxide electrocatalyst materials with specific morphology and microstructure.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Luiz G. S. Albano, Davi H. S. de Camargo, Gabriel R. Schleder, Samantha G. Deeke, Tatiana P. Vello, Leirson D. Palermo, Catia C. Correa, Adalberto Fazzio, Christof Woell, Carlos C. B. Bufon
Summary: The advances in surface-supported metal-organic framework (SURMOF) thin-film synthesis have enabled effective integration of MOF structures into electronic devices, leading to the observation of room-temperature negative differential resistance (NDR) in vertical heterojunctions. The NDR effect can be tailored by controlling humidity and electric field, resulting in high PVCR values under low voltages. These findings showcase the potential of utilizing physical effects in SURMOF heterojunctions for future scalable functional devices.
Article
Chemistry, Analytical
Benedikt Sapotta, Matthias Schwotzer, Christof Woell, Matthias Franzreb
Summary: This novel method combines electrochemical impedance spectroscopy with dielectrometry, providing a reliable way to determine thickness and permittivity values of thin films. It demonstrates the ability to monitor the in-situ growth of crystalline films on an interdigitated electrode geometry.
Correction
Physics, Multidisciplinary
Pablo G. Lustemberg, Philipp Plessow, Yuemin Wang, Chengwu Yang, Alexei Nefedov, Felix Studt, Christof Woll, M. Veronica Ganduglia-Pirovano
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Zeinab Mohammed Hassan, Peter G. Weidler, Alexei Nefedov, Yi Luo, Stefan Heissler, Manuel Tsotsalas, Ritesh Haldar, Christof Woell
Summary: Metal-organic frameworks (MOFs) with periodic and modular structures can predict the physical and chemical properties of organic chromophores. In this study, a zinc-bianthryl (Zn-BA) surface-anchored MOF (SURMOF) thin film was constructed using a BA chromophore with metal-coordinating carboxylate groups. It was found that a photoinduced topotactic transformation occurred in the presence of oxygen, leading to changes in the optical properties of the Zn-BA SURMOF.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Chemistry, Physical
Chengwu Yang, Yunjun Cao, Philipp N. Plessow, Jia Wang, Alexei Nefedov, Stefan Heissler, Felix Studt, Yuemin Wang, Hicham Idriss, Thomas G. Mayerhoefer, Christof Woell
Summary: Catalytic decomposition of N2O on macroscopic monocrystalline CeO2(111) surfaces has been studied and found to be an effective way to control N2O emissions. The higher activity of reduced ceria surfaces compared to oxidized surfaces has been confirmed through experiments.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Tahereh Mohammadi Hafshejani, Weijia Wang, Jonas Heggemann, Alexei Nefedov, Stefan Heissler, Yuemin Wang, Philipp Rahe, Peter Thissen, Christof Woell
Summary: Detailed information on the structural, chemical, and physical properties of natural cleaved (10.4) calcite surfaces was obtained through a combined AFM and IR study using CO as a probe molecule under UHV conditions. The study revealed the adsorption characteristics and vibrational frequencies of CO on the surface, with a well-defined adsorption site and clear vibrational bands.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
