Tackling orientation of metal-organic frameworks (MOFs): The quest to enhance MOF performance

Khalil, Islam E.; Fonseca, Javier; Reithofer, Michael R.; Eder, Tanja; Chin, Jia Min

doi:10.1016/j.ccr.2023.215043

Cited by 145 publications

(54 citation statements)

References 253 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…53,54 Two-dimensional (2D) architectures obtained from the crystal growth on the substrates can provide significant advantages in device fabrication such as MOF films and membranes. 49,[66][67][68][69][70][71] An approach to achieving macroscopic epitaxial growth of oriented 2D film of MOFs involves initially depositing seed MOF crystals onto substrates, followed by subsequent growth of these identical crystals (Fig. 2a).…”

Section: Alignment Of Mof Crystals On Substratesmentioning

confidence: 99%

“…Another approach utilizes external forces like electric and magnetic fields, interfacial tension, and capillary and depletion forces to guide the orientation of pre-formed MOF crystals. 49,50,55 Using pre-formed crystals offers flexibility in material selection and ensures consistent starting points for size, shape, and morphology, enabling the fabrication of highly ordered orientations in large quantities. 39,55 Self-assembly of polyhedral MOF particles with distinct facets leads to the formation of oriented structures, allowing full utilization of directional anisotropic properties over a large area.…”

Section: Introductionmentioning

confidence: 99%

“…Precise arrangement of pre-formed MOF crystals enhances their functionalities, expanding their applications. 49 Aligned MOF crystals selectively expose specific facets, maximizing their anisotropic properties and leading to improved characteristics, such as permeability, diffusivity, selectivity, conductivity, catalytic properties, optical properties, and wettability. 49,50 One prominent example is the improved molecular separation achieved through controlled alignment.…”

Section: Introductionmentioning

confidence: 99%

“…49 Aligned MOF crystals selectively expose specific facets, maximizing their anisotropic properties and leading to improved characteristics, such as permeability, diffusivity, selectivity, conductivity, catalytic properties, optical properties, and wettability. 49,50 One prominent example is the improved molecular separation achieved through controlled alignment. [56][57][58] By aligning MOF crystals in a specific direction, precise pathways for guest molecules can be engineered, resulting in superior selectivity and mass transport.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Macroscopic alignment of metal–organic framework crystals in specific crystallographic orientations

Park,

Moon,

Kim

2023

Mater. Chem. Front.

View full text Add to dashboard Cite

show abstract

Section: Alignment Of Mof Crystals On Substratesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Macroscopic alignment of metal–organic framework crystals in specific crystallographic orientations

Park,

Moon,

Kim

2023

Mater. Chem. Front.

View full text Add to dashboard Cite

show abstract

“…Controlled alignment of MOF crystals is, therefore, a key focus to harnessing and translating the directional functionality of individual crystals to the macroscale; − this can be achieved through various strategies, such as entropically driven or modulator-driven MOF ordering, in situ solvothermal growth on substrates that favor directional crystal growth, or secondary growth crystallization, or via external stimuli to obtain superlattices or directionally aligned MOF materials. ,− Many of these methods require substrates, which hinder applicability, with few works utilizing these approaches to fabricate free-standing films. − Furthermore, entropically driven assembly is often limited by demanding requirements such as a high degree of MOF crystal uniformity in terms of size and shape, while in situ growth may require carefully controlled synthetic conditions specifically tailored to the MOF of interest, which can be time-consuming to optimize. A new way to align MOF particles is via an electric-field (E-field)-assisted assembly.…”

Section: Introductionmentioning

confidence: 99%

Alignment of Breathing Metal–Organic Framework Particles for Enhanced Water-Driven Actuation

Andreo,

Balsa,

Tsang

et al. 2023

Chem. Mater.

Self Cite

View full text Add to dashboard Cite

As the majority of known metal−organic frameworks (MOFs) possess anisotropic crystal lattices and thus anisotropic physicochemical properties, a pressing practical challenge in MOF research is the establishment of robust and simple processing methods to fully harness the anisotropic properties of the MOFs in various applications. We address this challenge by applying an E-field to precisely align MIL-88A microcrystals and generate MIL-88A@polymer films. Thereafter, we demonstrate the impact of MOF crystal alignment on the actuation properties of the films as a proof of concept. We investigate how different anisotropies of the MIL-88A@polymer films, specifically, crystal anisotropy, particle alignment, and film composition, can lead to the synergetic enhancement of the film actuation upon water exposure. Moreover, we explore how the directionality in application of the external stimuli (dry/humid air stream, water/air interface) affects the direction and the extent of the MIL-88A@polymer film movement. Apart from the superior water-driven actuation properties of the developed films, we demonstrate by dynamometer measurements the higher degree of mechanical work performed by the aligned MIL-88A@polymer films with the preserved anisotropies compared to the unaligned films. The insights provided by this work into anisotropic properties displayed by aligned MIL-88A@polymer films promise to translate crystal performance benefits measured in laboratories into real-world applications. We anticipate that our work is a starting point to utilize the full potential of anisotropic properties of MOFs.

show abstract

Fabrication of Oriented Polycrystalline MOF Superstructures

Linares‐Moreau,

Brandner,

Velásquez‐Hernández

et al. 2023

Advanced Materials

Self Cite

View full text Add to dashboard Cite

The field of metal‐organic frameworks (MOFs) has progressed beyond the design and exploration of powdery and single‐crystalline materials. A current challenge is the fabrication of organized superstructures that can harness the directional properties of the individual constituent MOF crystals. To date, the progress in the fabrication methods of polycrystalline MOF superstructures has led to close‐packed structures with defined crystalline orientation. By controlling the crystalline orientation, the MOF pore channels of the constituent crystals can be aligned along specific directions: these systems possess anisotropic properties including enhanced diffusion along specific directions, preferential orientation of guest species, and protection of functional guests. In this perspective, we discuss the current status of MOF research in the fabrication of oriented polycrystalline superstructures focusing on the specific crystalline directions of orientation. Three methods are examined in detail: the assembly from colloidal MOF solutions, the use of external fields for the alignment of MOF particles, and the heteroepitaxial ceramic‐to‐MOF growth. This perspective aims at promoting the progress of this field of research and inspiring the development of new protocols for the preparation of MOF systems with oriented pore channels, to enable advanced MOF‐based devices with anisotropic properties.

show abstract

Tackling orientation of metal-organic frameworks (MOFs): The quest to enhance MOF performance

Cited by 145 publications

References 253 publications

Macroscopic alignment of metal–organic framework crystals in specific crystallographic orientations

Macroscopic alignment of metal–organic framework crystals in specific crystallographic orientations

Alignment of Breathing Metal–Organic Framework Particles for Enhanced Water-Driven Actuation

Fabrication of Oriented Polycrystalline MOF Superstructures

Contact Info

Product

Resources

About