Multi-Scale 3D Printed Capillary Gripper

This work presents multi-scale approaches to investigate 3D printed structured Mn–Na–W/SiO2 catalysts used for the oxidative coupling of methane (OCM) reaction. The performance of the 3D printed catalysts has been compared to their conventional analogues, packed beds of pellets and powder. The physicochemical properties of the 3D printed catalysts were investigated using scanning electron microscopy, nitrogen adsorption and X-ray diffraction (XRD). Performance and durability tests of the 3D printed catalysts were conducted in the laboratory and in a miniplant under real reaction conditions. In addition, synchrotron-based X-ray diffraction computed tomography technique (XRD-CT) was employed to obtain cross sectional maps at three different positions selected within the 3D printed catalyst body during the OCM reaction. The maps revealed the evolution of catalyst active phases and silica support on spatial and temporal scales within the interiors of the 3D printed catalyst under operating conditions. These results were accompanied with SEM-EDS analysis that indicated a homogeneous distribution of the active catalyst particles across the silica support.

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Characterization of surface topography of 3D printed parts by multi-scale analysis

International Journal on Interactive Design and Manufacturing (IJIDeM) ◽

10.1007/s12008-017-0433-9 ◽

2017 ◽

Vol 12 (3) ◽

pp. 1007-1014 ◽

Cited By ~ 5

Author(s):

Yann Quinsat ◽

Claire Lartigue ◽

Christopher A. Brown ◽

Lamine Hattali

Keyword(s):

Surface Topography ◽

Scale Analysis ◽

Multi Scale ◽

3D Printed ◽

Multi Scale Analysis

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A multi-scale analytical methodology for the prediction of mechanical properties of 3D-printed materials with continuous fibres

Additive Manufacturing ◽

10.1016/j.addma.2020.101394 ◽

2020 ◽

Vol 36 ◽

pp. 101394 ◽

Cited By ~ 1

Author(s):

E. Polyzos ◽

A. Katalagarianakis ◽

D. Polyzos ◽

D. Van Hemelrijck ◽

L. Pyl

Keyword(s):

Mechanical Properties ◽

Analytical Methodology ◽

Multi Scale ◽

3D Printed ◽

Prediction Of Mechanical Properties ◽

Printed Materials

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3D‐Printed Strong Dental Crown with Multi‐Scale Ordered Architecture, High‐Precision, and Bioactivity

Advanced Science ◽

10.1002/advs.202104001 ◽

2021 ◽

pp. 2104001

Author(s):

Menglu Zhao ◽

Danlei Yang ◽

Suna Fan ◽

Xiang Yao ◽

Jiexin Wang ◽

...

Keyword(s):

High Precision ◽

Multi Scale ◽

3D Printed ◽

Dental Crown

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Multi-layer Scaffolds of Poly(caprolactone), Poly(glycerol sebacate) and Bioactive Glasses Manufactured by Combined 3D Printing and Electrospinning

Nanomaterials ◽

10.3390/nano10040626 ◽

2020 ◽

Vol 10 (4) ◽

pp. 626 ◽

Cited By ~ 3

Author(s):

Adja B. R. Touré ◽

Elisa Mele ◽

Jamieson K. Christie

Keyword(s):

3D Printing ◽

Three Dimensional ◽

Bioactive Glasses ◽

Multi Scale ◽

Potential Applications ◽

3D Printed ◽

Excellent Adhesion ◽

Poly Caprolactone ◽

Hydrolysis Of

Three-dimensional (3D) printing has been combined with electrospinning to manufacture multi-layered polymer/glass scaffolds that possess multi-scale porosity, are mechanically robust, release bioactive compounds, degrade at a controlled rate and are biocompatible. Fibrous mats of poly (caprolactone) (PCL) and poly (glycerol sebacate) (PGS) have been directly electrospun on one side of 3D-printed grids of PCL-PGS blends containing bioactive glasses (BGs). The excellent adhesion between layers has resulted in composite scaffolds with a Young’s modulus of 240–310 MPa, higher than that of 3D-printed grids (125–280 MPa, without the electrospun layer). The scaffolds degraded in vitro by releasing PGS and BGs, reaching a weight loss of ~14% after 56 days of incubation. Although the hydrolysis of PGS resulted in the acidification of the buffer medium (to a pH of 5.3–5.4), the release of alkaline ions from the BGs balanced that out and brought the pH back to 6.0. Cytotoxicity tests performed on fibroblasts showed that the PCL-PGS-BGs constructs were biocompatible, with cell viability of above 125% at day 2. This study demonstrates the fabrication of systems with engineered properties by the synergy of diverse technologies and materials (organic and inorganic) for potential applications in tendon and ligament tissue engineering.

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Multi-scale analysis for 3D printed continuous fiber reinforced thermoplastic composites

Composites Science and Technology ◽

10.1016/j.compscitech.2021.109065 ◽

2021 ◽

Vol 216 ◽

pp. 109065

Author(s):

Yutong Fu ◽

Xuefeng Yao

Keyword(s):

Thermoplastic Composites ◽

Scale Analysis ◽

Fiber Reinforced ◽

Continuous Fiber ◽

Multi Scale ◽

3D Printed ◽

Multi Scale Analysis

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Multi-scale finite element modeling of 3D printed structures subjected to mechanical loads

Rapid Prototyping Journal ◽

10.1108/rpj-05-2016-0074 ◽

2018 ◽

Vol 24 (1) ◽

pp. 177-187 ◽

Cited By ~ 7

Author(s):

Dalia Calneryte ◽

Rimantas Barauskas ◽

Daiva Milasiene ◽

Rytis Maskeliunas ◽

Audrius Neciunas ◽

...

Keyword(s):

Finite Element ◽

Composite Structures ◽

Computational Models ◽

Three Dimensional ◽

Structural Response ◽

Content Type ◽

Multi Scale ◽

Macro Scale ◽

Internal Constitution ◽

3D Printed

Purpose The purpose of this paper is to investigate the influence of geometrical microstructure of items obtained by applying a three-dimensional (3D) printing technology on their mechanical strength. Design/methodology/approach Three-dimensional printed items (3DPI) are composite structures of complex internal constitution. The buildup of the finite element (FE) computational models of 3DPI is based on a multi-scale approach. At the micro-scale, the FE models of representative volume elements corresponding to different additive layer heights and different thicknesses of extruded fibers are investigated to obtain the equivalent non-linear nominal stress–strain curves. The obtained results are used for the creation of macro-scale FE models, which enable to simulate the overall structural response of 3D printed samples subjected to tensile and bending loads. Findings The validation of the models was performed by comparing the computed results against the experimental ones, where satisfactory agreement has been demonstrated within a marked range of thicknesses of additive layers. Certain inadequacies between computed against experimental results were observed in cases of thinnest and thickest additive layers. The principle explanation of the reasons of inadequacies takes into account the poorer quality of mutual adhesion in case of very thin extruded fibers and too-early solidification effect. Originality/value Flexural and tensile experiments are simulated by FE models that are created with consideration to microstructure of 3D printed samples.

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