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

Andreo, Jacopo; Balsa, Alejandra Durán; Tsang, Min Ying; Sinelshchikova, Anna; Zaremba, Orysia; Wuttke, Stefan; Chin, Jia Min

doi:10.1021/acs.chemmater.3c01186

Cited by 9 publications

(7 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the study carried out by our research group (2023), MIL-88A crystals were E-field-aligned within poly(ethylene glycol) diacrylate (PEGDA), and the resulting films exhibited different bending angles at various humidity levels and could revert back to their original state in dry air. 43 Films with aligned MIL-88A crystals showed faster and more pronounced responses to changes in humidity (Figure 8) during alternating exposure to dry and humid air.…”

Section: Potential Applicationsmentioning

confidence: 99%

“…For instance, when exposed to water, MIL-88A exhibits a decrease in the lattice parameter c from 15.31 to 12.66 Å and a simultaneous increase in the lattice parameter a from 9.26 to 13.87 Å. 43,44 This property is particularly ideal for the development of moisturesensitive MOF-based sensors and actuators, as demonstrated by several groups. 45−47 However, the strong anisotropic lattice changes mean that the expansion and contraction effects of unaligned particles would partially cancel each other out during the directional swelling of films.…”

Section: Potential Applicationsmentioning

confidence: 99%

See 1 more Smart Citation

Physicochemical Methods for the Structuring and Assembly of MOF Crystals

Zorlu,

Hetey,

Reithofer

et al. 2024

Acc. Chem. Res.

Self Cite

View full text Add to dashboard Cite

Metrics & MoreArticle Recommendations CONSPECTUS: Metal−organic frameworks (MOFs) are promising for various applications through the creation of innovative materials and assemblies. This potential stems from their modular nature, as diverse metal ions and organic linkers can be combined to produce MOFs with unique chemical properties and lattice structures. Following extensive research on the design and postsynthetic chemical modification of MOF lattices at the molecular level, increasing attention is now focused on the next hierarchical level: controlling the morphology of MOF crystals and their subsequent assembly and positioning to create functional composites.Beyond well-established methods to regulate crystal size and shape through nucleation and coordination modulation, physicochemical techniques leveraging wetting effects, interparticle interactions, and magnetic or electric fields offer attractive avenues for the hierarchical structuring and assembly of MOFs. These techniques facilitate crystal alignment and yield unique superstructures. While our research group primarily focuses on directing MOF crystal orientation and positioning using external stimuli such as magnetic and electric fields, we also explore hierarchical MOF synthesis and structuring using liquid interfaces and depletion force-assisted packing. This account highlights our journey and progress in developing methods to regulate the morphology, assembly, orientation, and positioning of MOF crystals, placed in the context of work by other groups. First, we examine commonly utilized structuring methods for MOF crystals that employ liquid−liquid and air−liquid interfaces to spatially confine reactions, allowing us to access unique morphologies such as mushroom-like crystals and Janus particles. We also discuss strategies for concentrating and packing MOF crystals into superstructures, utilizing fluid interfaces for spatial confinement of crystals, depletion forces, entropic effects, and crystal sedimentation.A particularly compelling challenge in expanding the applicability of MOF materials is how to manipulate free-standing MOF crystals. This issue is especially important because MOFs are typically produced as loose powders, and industrial material processing is generally more efficient when the material is fluidized. While extensive research has been conducted regarding MOF growth on substrates with both positional and orientational control, there is a clear need for similar precision with free-standing MOFs dispersed in a fluid matrix. Our group has thus focused on the relatively new, yet powerful approach of using electric and magnetic fields to manipulate MOF crystals, which offers unprecedented control over the orientation and positioning of dispersed MOF crystals, complementing the more well-established methods of MOF growth on substrates. In this Account, we provide foundational background and discussions on the interactions between these external fields and MOF crystals, including critical considerations for effective MOF manipulation u...

show abstract

Section: Potential Applicationsmentioning

confidence: 99%

Section: Potential Applicationsmentioning

confidence: 99%

Physicochemical Methods for the Structuring and Assembly of MOF Crystals

Zorlu,

Hetey,

Reithofer

et al. 2024

Acc. Chem. Res.

Self Cite

View full text Add to dashboard Cite

show abstract

“…More recently, Chin, Wuttke and co‐workers have focused their efforts on maximizing the solvent‐responsive anisotropic breathing properties of MIL‐88A: [ 199 ] Mellot‐Draznieks et al. demonstrated the decrease of the crystalline unit cell parameter c from 15.31 to 12.66 Å coupled with the increase of the a parameter from 9.26 to 12.66 Å when going from the dry as‐synthesized MIL‐88A to its hydrated form.…”

Section: Oriented Polycrystalline Mof Superstructures By External Forcesmentioning

confidence: 99%

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

“…Very recently, a MIL-88A@PEGDA water-driven actuator with MIL-88A microcrystals being patterned by an electric field has also been reported. 49 Furthermore, the abundant organic groups in MOF materials also make it possible to introduce multiple response modes and develop various response solvents. Nevertheless, due to the limited examples of polymer/MOF solvent-driven actuators, the structure–function relationship is still unclear, such as the relationship between the MOF structure and the organic solvent selectivity, and the possible synergistic response of the flexible MOF fillers and the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%