Anisotropy in metal–organic framework thin films

Rahmati, Zahra; Khajavian, Ruhollah; Mirzaei, Masoud

doi:10.1039/d1qi00300c

Cited by 23 publications

(12 citation statements)

References 41 publications

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“…MOFs exhibit exceptionally high surface area and porosity, making them versatile in biomedical research for applications such as drug delivery, disease diagnosis, and treatment . Notably, MOFs feature a specific anisotropy among pores, , and the dominant forces arise from coordination bonds formed by metal centers and ligands, alongside additional interactions like hydrogen bonds, van der Waals forces, and π–π stacking. − …”

Section: Resultsmentioning

confidence: 99%

Disordered Convolution Region of P(VDF-TrFE) Piezoelectric Nanoparticles: The Core of Sono–Piezo Dynamic Therapy

Chen,

Yang,

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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The recent focus on P(VDF-TrFE) material in biomedical engineering stems from its outstanding mechanical properties and biocompatibility. However, its application in sono−piezo dynamic therapy (SPDT) has been relatively unexplored. In this study, we developed composite piezoelectric nanoparticles (rPGd NPs@RGD) based on recrystallized P(VDF-TrFE) particles, which offer dual capabilities of MRI imaging and targeted treatment for brain gliomas. SEM observations of P(VDF-TrFE) particles in the disordered convolution region (DCR) revealed recrystallization, representing the polymer chain structure and particle polarity. In comparison to nonrecrystallized nanoparticles, rPGd NPs@RGD exhibited remarkable stability and biocompatibility. Under ultrasound excitation, they generated significantly higher levels of reactive oxygen species, effectively inhibiting tumor cell proliferation, invasion, and migration. rPGd NPs@RGD demonstrated excellent MRI imaging capabilities and antitumor activity in U87 tumor-bearing mice. This study highlights the remarkable SPDT abilities of the developed nanoparticles, attributed to the microscopic morphological changes in the DCR that increase the nanoparticle's polarity and thus boost its potential for SPDT. This research opens new possibilities for utilizing P(VDF-TrFE) materials in advanced biomedical applications.

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Section: Resultsmentioning

confidence: 99%

Disordered Convolution Region of P(VDF-TrFE) Piezoelectric Nanoparticles: The Core of Sono–Piezo Dynamic Therapy

Chen,

Yang,

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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“…8,9 MOFs offer benefits such as adjustable porosity, high specific surface area, and customizable architectures when compared to typical porous materials such as porous carbon, porous catalysts and porous polymers. 10–14 All these properties could (at least theoretically) address the need to develop novel sensing materials with high sensitivity, excellent selectivity, fast response times, enhanced stability and reusability. 15 Hence, MOF materials have promising future in the fields of bioimaging, adsorption, 16,17 catalysis, 18 magnetism, 19 sensing, 20,21 and drug delivery.…”

Section: Introductionmentioning

confidence: 99%

Metal–organic frameworks (MOFs) as apt luminescent probes for the detection of biochemical analytes

et al. 2023

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“…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.

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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.

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Anisotropy in metal–organic framework thin films

Abstract: MOF thin films are a gigantic category of porous materials composed of organic ligands in connection with metallic nodes. The fabrication of specifically oriented MOF films on surfaces has drawn...

Cited by 23 publications

References 41 publications

Disordered Convolution Region of P(VDF-TrFE) Piezoelectric Nanoparticles: The Core of Sono–Piezo Dynamic Therapy

Disordered Convolution Region of P(VDF-TrFE) Piezoelectric Nanoparticles: The Core of Sono–Piezo Dynamic Therapy

Metal–organic frameworks (MOFs) as apt luminescent probes for the detection of biochemical analytes

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

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