1
|
Alowasheeir A, Torad NL, Asahi T, Alshehri SM, Ahamad T, Bando Y, Eguchi M, Yamauchi Y, Terasawa Y, Han M. Synthesis of millimeter-scale ZIF-8 single crystals and their reversible crystal structure changes. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2024; 25:2292485. [PMID: 38259326 PMCID: PMC10802801 DOI: 10.1080/14686996.2023.2292485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Accepted: 11/24/2023] [Indexed: 01/24/2024]
Abstract
Among various metal-organic frameworks (MOFs), the zeolitic imidazole framework (ZIF), constructed by the regular arrangement of 2-methylimidazole and metal ions, has garnered significant attention due to its distinctive crystals and pore structures. Variations in the sizes and shapes of ZIF crystals have been reported by changing the synthesis parameters, such as the molar ratios of organic ligands to metal ions, choice of solvents, and temperatures. Nonetheless, the giant ZIF-8 single crystals beyond the typical range have rarely been reported. Herein, we present the synthesis of millimeter-scale single crystal ZIF-8 using the solvothermal method in N,N-diethylformamide. The resulting 1-mm single crystal is carefully characterized through N2 adsorption-desorption isotherms, scanning electron microscopy, and other analytical techniques. Additionally, single-crystal X-ray diffraction is employed to comprehensively investigate the framework's mobility at various temperatures.
Collapse
Affiliation(s)
- Azhar Alowasheeir
- Department of Materials Process Engineering, Graduate School of Engineering, Nagoya University, Nagoya, Japan
| | - Nagy L. Torad
- Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt
- Department of Chemistry, Khalifa University, Abu Dhabi, United Arab Emirates
- Advanced Materials Chemistry Center (AMCC), Khalifa University, Abu Dhabi, United Arab Emirates
| | - Toru Asahi
- School of Advanced Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, Japan
| | - Saad M. Alshehri
- Chemistry Department, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Tansir Ahamad
- Chemistry Department, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Yoshio Bando
- Chemistry Department, College of Science, King Saud University, Riyadh, Saudi Arabia
- Australian Institute for Innovative Materials, University of Wollongong, North Wollongong, New South Wales, Australia
| | - Miharu Eguchi
- School of Advanced Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, Japan
- Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland, Australia
| | - Yusuke Yamauchi
- Department of Materials Process Engineering, Graduate School of Engineering, Nagoya University, Nagoya, Japan
- Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland, Australia
| | - Yukana Terasawa
- Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, Shinjuku-ku, Tokyo, Japan
- Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto-shi, Kumamoto, Japan
| | - Minsu Han
- Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland, Australia
| |
Collapse
|
2
|
Thakur S, Giri A. Reversible and high-contrast thermal conductivity switching in a flexible covalent organic framework possessing negative Poisson's ratio. MATERIALS HORIZONS 2023; 10:5484-5491. [PMID: 37843868 DOI: 10.1039/d3mh01417g] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2023]
Abstract
The ability to dynamically and reversibly control thermal transport in solid-state systems can redefine and propel a plethora of technologies including thermal switches, diodes, and rectifiers. Current material systems, however, do not possess the swift and large changes in thermal conductivity required for such practical applications. For instance, stimuli responsive materials, that can reversibly switch between a high thermal conductivity state and a low thermal conductivity state, are mostly limited to thermal switching ratios in the range of 1.5 to 4. Here, we demonstrate reversible thermal conductivity switching with an unprecedented 18× change in thermal transport in a highly flexible covalent organic framework with revolving imine bonds. The pedal motion of the imine bonds is capable of reversible transformations of the framework from an expanded (low thermal conductivity) to a contracted (high thermal conductivity) phase, which can be triggered through external stimuli such as exposure to guest adsorption and desorption or mechanical strain. We also show that the dynamic imine linkages endow the material with a negative Poisson's ratio, thus marking a regime of materials design that combines low densities with exceptional thermal and mechanical properties.
Collapse
Affiliation(s)
- Sandip Thakur
- Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island, Kingston, RI 02881, USA.
| | - Ashutosh Giri
- Department of Mechanical, Industrial and Systems Engineering, University of Rhode Island, Kingston, RI 02881, USA.
| |
Collapse
|