4D printing or not 4D printing? Mechanically actuatable 3D scaffolds for regenerative medicine

Lorenzo Moroni

by Lorenzo Moroni, MERLN, Maastricht University

A key factor in scaffold-based tissue and organ regeneration relies on enhancing (stem) cell-material interactions to obtain the same original functionality. A possible way to build in functionality at the interface between materials and cells can be offered by 4D (bio)printing. Whether we are really witnessing 4D printing, a process which should be defined when the programmed temporal shape change happens during the 3D manufacturing itself, or not is still to be clarified in the field.

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Utilising Parametric Customisation to Translate Auxetic Structure Theory into Additively Manufactured Multimaterial Performative Geometries

Brittany Mark

presentation by Brittany Mark, Victoria University of Wellington at online 4D Printing & Meta Materials Conference, May 26, 2020, 09:00 – 12:00 CET.

Auxetic Structures are a class of Metamaterials uniquely characterised by their Negative Poissons Ratio, that is when a lateral force is applied they expand longitudinally, becoming thicker and stronger, perpendicular to the strain. This counterintuitive behaviour has many enhanced behavioural properties, our research has specifically focused on their response to impact forces for sports protection scenarios.

Additive Manufacturing using the Stratasys J750 multimaterial printer allows us to print reactive physical properties of Auxetic Structures, manipulated through generative programming. This parametric customisation of the internal topology, materiality and subsequent 4D printing has the potential for geometries to be uniquely designed for pre-determined impact scenarios.

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The effect of 4D printed internal structure on the shape memory effect of shape memory polymers

Jiwoo Choi

by Jiwoo Choi, Dyson School of Design Engineering, Imperial College London

One way to 4D print is through the use of Shape Memory Polymers (SMP). these are a type of polymer which react to an external stimulus (e.g. temperature) and subsequently change their shape in a programmed manner. Previous 4D printing research has focused on different material properties (chemistry) or geometric shape (size, thickness etc.) to control its morphing behaviour.

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Thermo-Mechanical Metamaterials: Towards Stimuli Responsive Micro-Robotics

Ji Qingxiang

by Ji Qingxiang, Femto-st, CNRS, Université de Franche-Comté (UFC)

Metamaterials have attracted large scientific interest as promising candidates to break some fundamental bound on materials properties and to realize some dreaming devices such as the invisibility cloaks or the perfect flat lenses based on negative refraction.

However, the bounds appeared to be more fundamental and the field has extended to some coupled physical phenomena where one physics acts as the driving force. They are called stimuli-responsive metamaterials and have been demonstrated in many combinations like thermoelastic, magneto-optics, piezo-electric etc. In this paper, we show the possibility of printing the basic elements of a 3 axis microrobot using single-step lithography.

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Topology optimization of structures with metamaterials – Presented by Jun Wu, TU Delft

Jun Wu

Jun Wu, TU Delft, will speak at 4D Printing & Meta Materials Conference, on April 17, during the 3D Printing Event in The Netherlands.

Lightweight structures are of ultimate importance in aerospace, automotive, and industrial design engineering. Typically structures are designed and manufactured with solid materials. Emerging porous metamaterials offer new opportunities and challenges for the design of functional structures.

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Smart Composite Structures – Applications in Offshore Energy Generation – Presented by Monssef Drissi-Habti, The French Institute for Transport, IFSTTAR

Monssef Drissi-Habti

Monssef Drissi-Habti, IFSTTAR, will speak at 4D Printing & Meta Materials Conference, on April 17, during the 3D Printing Event in The Netherlands.

Interview

What drives you?

Research, Innovation, lobbying, exchange of ideas and projects set-ups …

Why should the delegate attend your presentation?

Research aspects that will be presented is a summary of interesting results on a very challenging topics related to offshore energy generation. I think that researchers can easily identify future ideas for 4D-Printing projects that hopefully we would share.

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Programmable Meta-materials Based on Multistable Meta-atoms – Presented by Mohamed Zanaty, EPFL

Mohamed Zanaty

Mohamed Zanaty, INSTANT-LAB, EPFL, will speak at 4D Printing & Meta Materials Conference, on April 17, during the 3D Printing Event at Brightlands Chemelot Campus in The Netherlands.

In this talk, I will present a novel family of programmable metamaterial based programmable multistable mechanisms (PMM). PMMs are multistable mechanisms where the stability behavior depends on the mechanism boundary conditions. Different examples of PMMs will be presented to illustrate the concept of stability programming.

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A DIY approach to Rapid Liquid Printing – Duo presentation Jori van der Kolk & Vimukthi Gunatilleke, Eindhoven University of Technology

A DIY approach to Rapid Liquid Printing – Duo presentation Jori van der Kolk & Vimukthi Gunatilleke, Eindhoven University of Technology, at 4D Printing & Meta Materials Conference, on April 17, during the 3D Printing Event at Brightlands Chemelot Campus in The Netherlands.

Rapid Liquid printing is a 3D printing technology where a viscous material is printed in a suspension material. Based on research from MIT’s self-assembly lab, Jori and Vim build a Liquid printer from readily available 3D printer parts. They will elaborate on the building process of the machine and talk about the future possibilities of this technology in the design process.

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