Maintaining Stable Zeolitic Imidazolate Framework (ZIF) Templates during Polyelectrolyte Multilayer Coating

Beyer, Sven; Schürmann, Robin; Feldmann, Ines; Blocki, Anna; Bald, Ilko; Schneider, R.; Emmerling, Franziska

doi:10.1016/j.colcom.2017.11.004

Cited by 18 publications

(21 citation statements)

References 24 publications

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“…Another relevant reason for obtaining nanoparticles is the homogeneity of the resulting suspensions that are stable without further surface modifications that would otherwise be required. 24…”

Section: Results and Discussionmentioning

confidence: 99%

Covalently Fluorophore-Functionalized ZIF-8 Colloidal Particles as a Sensing Platform for Endocrine-Disrupting Chemicals Such as Phthalates Plasticizers

et al. 2019

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We present the optical sensing of phthalate esters (PAEs), a group of endocrine-disrupting chemicals. The sensing takes place as changes in the fluorescence emission intensity of aminopyrene covalently bound to the organic ligands of the metal–organic framework compound ZIF-8. In the presence of PAEs, a quenching of the fluorescence emission is observed. We evaluated strategies to engineer colloidal size distribution of the sensing particles to optimize the sensory response to PAEs. A thorough characterization of the modified ZIF-8 nanoparticles included powder X-ray diffractometry, transmission electron microscopy, high-performance liquid chromatography, and photophysical characterization. The presented capability of the fluorophore-functionalized ZIF-8 to sense PAEs complements established methods such as chromatography-based procedures, which cannot be used on-site and paves the way for future developments such as hand-held quick sensing devices.

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Section: Results and Discussionmentioning

confidence: 99%

Covalently Fluorophore-Functionalized ZIF-8 Colloidal Particles as a Sensing Platform for Endocrine-Disrupting Chemicals Such as Phthalates Plasticizers

et al. 2019

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“…The height of the central gel region was 120 µm and the design was adapted from earlier work [15]. Microfluidic devices were coated with poly-D-lysine, a polyelectrolyte to facilitate protein absorption through electrostatic forces similar to the layer-by-layer polyelectrolyte multilayer build-up described by some of us [16]. Microfluidic device fabrication followed previously published protocols [17,18].…”

Section: Microfluidic Device Design Fabrication and Cell Culturementioning

confidence: 99%

Lectin Staining of Microvascular Glycocalyx in Microfluidic Cancer Cell Extravasation Assays

Beyer

Blocki

Cheung

et al. 2021

Life

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The endothelial glycocalyx forms the inner-most lining of human microvasculature. It ensures the physiological function of blood vessels and plays a crucial role in the occurrence and progression of microvascular diseases. The present communication aims to highlight the usefulness of high-resolution imaging of lectin (Bandeiraea Simplicifolia) stained endothelial glycocalyx in 3-dimensional microfluidic cell cultures. The microfluidic system allowed visualizing cancer cell extravasation, which is a key event in metastasis formation in cancer pathologies. In brief, microvascular networks were created through spontaneous vasculogenesis. This occurred from 3 dimensional (3D) suspensions of human umbilical vein endothelial cells (HUVECs) in hydrogels confined within microfluidic devices. Extravasation of MDA-MB-231 breast cancer cells from perfusable endothelial lumens was observed with confocal imaging of lectin-stained microvascular networks. The present work provides guidance towards optimizing the methodology used to elucidate the role of the endothelial glycocalyx during cancer cell extravasation. In particular, a high-resolution view of the endothelial glycocalyx at the site of extravasation is presented. The occurrence of glycocalyx defects is well aligned with the contemporary notion in the field that glycocalyx shedding precedes cancer cell extravasation.

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“…For corrosion protection, the most common self-healing strategy is to embed corrosion inhibitors as active healing agents in the coating matrix. − These corrosion inhibitors can leach into the coating defect and immediately suppress the corrosion reactions that take place at the exposed metal substrate. In many cases, proper encapsulation of the inhibitor is beneficial to preserve its reactivity and to achieve its sustained and environmentally (pH-, Cl-, redox) responsive delivery within the coating defect. − The containers for encapsulating corrosion inhibitors can be inorganic nanoparticles made of layered double hydroxides, , halloysites, , and mesoporous SiO 2 , , or organic micro- or nanocapsules, such as polyelectrolyte microcapsules, , fibers, and hollow polymeric microspheres. , For inhibitor-based coatings, the healing effects result from corrosion inhibition rather than by intrinsic repair of the barrier properties of the coating. Therefore, the healing efficiency depends critically on the intrinsic performance, irreversibility, leaching capacity, and the amount of inhibitor in the coating.…”

Section: Introductionmentioning

confidence: 99%

Triple-Action Self-Healing Protective Coatings Based on Shape Memory Polymers Containing Dual-Function Microspheres

Huang

Deng

et al. 2018

ACS Appl. Mater. Interfaces

184

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In this study, a new self-healing shape memory polymer (SMP) coating was prepared to protect the aluminum alloy 2024-T3 from corrosion by the incorporation of dual-function microspheres containing polycaprolactone and the corrosion inhibitor 8-hydroxyquinoline (8HQ). The self-healing properties of the coatings were investigated via scanning electron microscopy, electrochemical impedance spectroscopy, and scanning electrochemical microscopy following the application of different healing conditions. The results demonstrated that the coating possessed a triple-action self-healing ability enabled by the cooperation of the 8HQ inhibitor, the SMP coating matrix, and the melted microspheres. The coating released 8HQ in a pH-dependent fashion and immediately suppressed corrosion within the coating scratch. After heat treatment, the scratched coating exhibited excellent recovery of its anticorrosion performance, which was attributed to the simultaneous initiation of scratch closure by the shape memory effect of the coating matrix, sealing of the scratch by the melted microspheres, and the synergistic effect of corrosion inhibition by 8HQ.

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Maintaining Stable Zeolitic Imidazolate Framework (ZIF) Templates during Polyelectrolyte Multilayer Coating

Cited by 18 publications

References 24 publications

Covalently Fluorophore-Functionalized ZIF-8 Colloidal Particles as a Sensing Platform for Endocrine-Disrupting Chemicals Such as Phthalates Plasticizers

Covalently Fluorophore-Functionalized ZIF-8 Colloidal Particles as a Sensing Platform for Endocrine-Disrupting Chemicals Such as Phthalates Plasticizers

Lectin Staining of Microvascular Glycocalyx in Microfluidic Cancer Cell Extravasation Assays

Triple-Action Self-Healing Protective Coatings Based on Shape Memory Polymers Containing Dual-Function Microspheres

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