Selective Laser Sintering of Metal‐Organic Frameworks: Production of Highly Porous Filters by 3D Printing onto a Polymeric Matrix

Abstract

Metal‐organic frameworks (MOFs) have raised a lot of interest, especially as adsorbing materials, because of their unique and well‐defined pore structures. One of the main challenges in the utilization of MOFs is their crystalline and powdery nature, which makes their use inconvenient in practice. Three‐dimensional printing has been suggested as a potential solution to overcome this problem. We used selective laser sintering (SLS) to print highly porous flow‐through filters containing the MOF copper(II) benzene‐1,3,5‐tricarboxylate (HKUST‐1). These filters were printed simply by mixing HKUST‐1 with an easily printable nylon‐12 polymer matrix. By using the SLS, powdery particles were fused together in such a way that the structure of the printed solid material resembles the structure of a powder bed. The MOF additive is firmly attached only on the surface of partially fused polymer particles and therefore remains accessible to fluids passing through the filter. Powder X‐ray analysis of the printed object confirmed that printing did not have any negative impact on the structure of the MOF. CO2‐adsorption studies also showed that the activity of the MOF was not affected by the printing process. SLS offers a straightforward and easy way to fabricate tailor‐made MOF‐containing filters for practical applications.

3D Printed Palladium Catalyst for Suzuki‐Miyaura Cross‐coupling Reactions

“…In order to study the possible changes in physical structure of the catalytic objects, SEM images of outer surfaces and internal structures of the catalyst before and after the reactions were obtained. Analysis of the images revealed – typical for SLS 3d printed objects – a highly porous structure both on the surface and in the bulk of the objects, which remained principally intact after 10 reaction cycles. The only observed changes were associated with the loss of loosely attached larger particles of sizes≥100 μm, which did not undergo sintering during the 3d printing process due to their size (Figure ).…”

“…Therefore, SLS 3d printing allows fabrication of solid but highly porous objects, in which fluid can flow through the voids between the partially fused particles, making catalysts within the bulk of the object accessible for contact with the reaction medium. We have previously demonstrated the applicability of SLS 3d printing for the production of porous filters with various absorption properties, flexible carbonous electrodes, and heterogeneous hydrogenation catalysts, and in this work we further develop catalytically active 3d printed materials with implementation in Suzuki‐Miyaura cross‐coupling reaction.…”

“…Selective laser sintering (SLS) 3d printing is a suitable method for manufacturing objects with inherent flow‐through porosity, and catalytically active additives can be added without pre‐ or post‐processing . In an SLS process, a powder is sintered by a moving infrared laser, forming 3d objects in a layer‐by‐layer fashion.…”

Powder-Based 3D Printing for the Fabrication of Device with Micro and Mesoscale Features

“…The X-ray analysis pointed out that the inherent structure of metal–organic-framework (MOF) is intact. When using PA 12 as the supporting matrix to hold the MOF materials, the 3D-printed structure could be used as filters catered for various applications [ 198 ]. SLS 3D-printing technology also helped to create filters that could withstand harsh environment with high pressure, temperature, corrosive wear and tribomechanics [ 199 ].…”

Novel Approach to Manufacture an AUV Propeller by Additive Manufacturing and Error Analysis

“…There is a long list of AM methods, such as Fused Deposition Modelling (FDM) [6][7][8][9], stereolithography [10][11][12] and selective laser sintering etc. [13][14][15]. In FDM, a thermo-plastic string in a semi-molten state is extruded through a nozzle that deposits a layer on the base plate.…”