scholarly journals Influence of Co-adsorbates on CO2 induced phase transition in functionalized pillared-layered metal–organic frameworks

2016 ◽  
Vol 4 (33) ◽  
pp. 12963-12972 ◽  
Author(s):  
Andreas Schneemann ◽  
Yukiko Takahashi ◽  
Robin Rudolf ◽  
Shin-ichiro Noro ◽  
Roland A. Fischer
Keyword(s):  
Phase Transition ◽  
Gas Separation ◽  
Metal Organic Frameworks ◽  
Co Adsorption ◽  
Gas Mixtures ◽  
Metal Organic ◽  
Separation Behavior

Co-adsorption measurements reveal the flexible and gas separation behavior of functionalized pillared-layered MOFs when exposed to gas mixtures.

scholarly journals Elastic Properties and Energy Loss Related to the Disorder–Order Ferroelectric Transitions in Multiferroic Metal–Organic Frameworks [NH4][Mg(HCOO)3] and [(CH3)2NH2][Mg(HCOO)3]

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3125
Author(s):  
Zhiying Zhang ◽  
Hongliang Yu ◽  
Xin Shen ◽  
Lei Sun ◽  
Shumin Yue ◽  
...  
Keyword(s):  
Phase Transition ◽  
Energy Loss ◽  
Elastic Properties ◽  
Ferroelectric Phase ◽  
Loss Modulus ◽  
Structural Phase ◽  
Metal Organic Frameworks ◽  
First Order ◽  
Metal Organic ◽  
Elastic Anomalies

Elastic properties are important mechanical properties which are dependent on the structure, and the coupling of ferroelasticity with ferroelectricity and ferromagnetism is vital for the development of multiferroic metal–organic frameworks (MOFs). The elastic properties and energy loss related to the disorder–order ferroelectric transition in [NH4][Mg(HCOO)3] and [(CH3)2NH2][Mg(HCOO)3] were investigated using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The DSC curves of [NH4][Mg(HCOO)3] and [(CH3)2NH2][Mg(HCOO)3] exhibited anomalies near 256 K and 264 K, respectively. The DMA results illustrated the minimum in the storage modulus and normalized storage modulus, and the maximum in the loss modulus, normalized loss modulus and loss factor near the ferroelectric transition temperatures of 256 K and 264 K, respectively. Much narrower peaks of loss modulus, normalized loss modulus and loss factor were observed in [(CH3)2NH2][Mg(HCOO)3] with the peak temperature independent of frequency, and the peak height was smaller at a higher frequency, indicating the features of first-order transition. Elastic anomalies and energy loss in [NH4][Mg(HCOO)3] near 256 K are due to the second-order paraelectric to ferroelectric phase transition triggered by the disorder–order transition of the ammonium cations and their displacement within the framework channels, accompanied by the structural phase transition from the non-polar hexagonal P6322 to polar hexagonal P63. Elastic anomalies and energy loss in [(CH3)2NH2][Mg(HCOO)3] near 264 K are due to the first-order paraelectric to ferroelectric phase transitions triggered by the disorder–order transitions of alkylammonium cations located in the framework cavities, accompanied by the structural phase transition from rhombohedral R3¯c to monoclinic Cc. The elastic anomalies in [NH4][Mg(HCOO)3] and [(CH3)2NH2][Mg(HCOO)3] showed strong coupling of ferroelasticity with ferroelectricity.

Carbon dioxide induced structural phase transition in metal–organic frameworks CPO-27

CrystEngComm ◽  
2020 ◽  
Vol 22 (26) ◽  
pp. 4353-4358
Author(s):  
Breogán Pato-Doldán ◽  
Mali H. Rosnes ◽  
Dmitry Chernyshov ◽  
Pascal D. C. Dietzel
Keyword(s):  
Phase Transition ◽  
Carbon Dioxide ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Metal Organic Frameworks ◽  
Honeycomb Structure ◽  
Metal Organic

The framework of CO2 saturated CPO-27 is deformed below 110 K into a superstructure of the original honeycomb structure.

Exploration of porous metal–organic frameworks for gas separation and purification

2019 ◽  
Vol 378 ◽  
pp. 87-103 ◽  
Author(s):  
Rui-Biao Lin ◽  
Shengchang Xiang ◽  
Huabin Xing ◽  
Wei Zhou ◽  
Banglin Chen
Keyword(s):  
Gas Separation ◽  
Metal Organic Frameworks ◽  
Porous Metal ◽  
Separation And Purification ◽  
Metal Organic

Interfacial engineering of metal–organic frameworks/graphene oxide composite membrane by polyethyleneimine for efficient H2/CH4 gas separation

2019 ◽  
Vol 6 (8) ◽  
pp. 2043-2049 ◽  
Author(s):  
Di Liu ◽  
Guangsheng Pang ◽  
Zhiyong Tang ◽  
Shouhua Feng
Keyword(s):  
Graphene Oxide ◽  
Gas Separation ◽  
Composite Membrane ◽  
Metal Organic Frameworks ◽  
Oxide Composite ◽  
Interfacial Engineering ◽  
Highly Efficient ◽  
Metal Organic

Interfacial engineering has demonstrated a significant effect on fabricating highly efficient membranes for gas separation.

Locking of phase transition in MOF ZIF-7: improved selectivity in mixed-matrix membranes for O2/N2 separation

2020 ◽  
Vol 7 (1) ◽  
pp. 223-228 ◽  
Author(s):  
Long Xiang ◽  
Donghui Liu ◽  
Hua Jin ◽  
Long-Wei Xu ◽  
Chongqing Wang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Metal Organic Frameworks ◽  
Gas Storage ◽  
Separation Process ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Metal Organic ◽  
Extrusion Mechanism ◽  
Matrix Membranes

The framework flexibility of metal–organic frameworks (MOFs) is beneficial for gas storage and adsorption but is disadvantageous to the separation process based on the size-extrusion mechanism.

Polymer functionalization to enhance interface quality of mixed matrix membranes for high CO2/CH4 gas separation

2015 ◽  
Vol 3 (29) ◽  
pp. 15202-15213 ◽  
Author(s):  
Nguyen Tien-Binh ◽  
Hoang Vinh-Thang ◽  
Xiao Yuan Chen ◽  
Denis Rodrigue ◽  
Serge Kaliaguine
Keyword(s):  
Gas Separation ◽  
Metal Organic Frameworks ◽  
Molar Ratio ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Interface Quality ◽  
High Co2 ◽  
Metal Organic ◽  
Matrix Membranes

Hydroxyl-functionalized homo- and co-polyimides 6FDA–(DAM)x–(HAB)y (with x : y molar ratio of 1 : 0; 2 : 1; 1 : 1; 1 : 2) and two metal–organic frameworks (MOFs), MIL-53(Al) and NH2-MIL-53(Al) were synthesized for preparation of mixed matrix membranes (MMMs).

Kinetics and equilibrium of gas adsorption on RPM1-Co and Cu-BTC metal-organic frameworks: Potential for gas separation applications

AIChE Journal ◽  
2008 ◽  
Vol 54 (4) ◽  
pp. 918-923 ◽  
Author(s):  
V. Krungleviciute ◽  
K. Lask ◽  
A. D. Migone ◽  
J.-Y. Lee ◽  
J. Li
Keyword(s):  
Gas Separation ◽  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Metal Organic

Microporous Metal-Organic Frameworks for Gas Separation

2014 ◽  
Vol 9 (6) ◽  
pp. 1474-1498 ◽  
Author(s):  
Bin Li ◽  
Hailong Wang ◽  
Banglin Chen
Keyword(s):  
Gas Separation ◽  
Metal Organic Frameworks ◽  
Metal Organic
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