Project

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Bioinspired 3-D reinforced composites

Applicant Studart André R.
Number 135306
Funding scheme Project funding (Div. I-III)
Research institution Departement Materialwissenschaft ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Material Sciences
Start/End 01.04.2011 - 31.03.2013
Approved amount 184'886.00
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Keywords (5)

magnetic; platelets; composites; structure; materials

Lay Summary (English)

Lead
Lay summary
The goal of this research project is to exploit our recent discovery of a ultra-high response of Fe3O4-modified Al2O3 platelets under magnetic fields to construct a new class of 3-D reinforced composites. Al2O3 platelets are a leading contender for discontinuous reinforcement and can easily be modified with magnetite nanoparticles through electrostatic adsorption mechanisms. This procedure allows for the remote control of reinforcement orientation under magnetic fields that can, among numerous exciting possibilities, lead to out-of-plane platelet alignment. To achieve this goal, we will first investigate the surprising alignment effect and fast dynamics of these modified platelets in magnetic fields through methodical experimentation and model development. Next we will extend our models to other anisotropic particles frequently used as discontinuous reinforcement to prove the universality of this method. We will then incorporate modified particles into common polymer matrices and apply magnetic fields to achieve unique and interesting alignment configurations. Finally, we will measure the mechanical properties of this new class of composites and determine if contemporary theory adequately describes these systems. Since the deliberate control of reinforcement particles would help solve the primary weakness of traditional composites, a deeper understanding of and investigation into this ultra-high magnetic response in modified Al2O3 platelets is merited.Due to the large strength to weight ratio of composites, their implementation as load-bearing materials is exponentially growing especially in aerospace, the automobile industry, and construction. The majority of commercial composites today are produced with aligned continuous fibers that lead to significant material strength along a single axis. To gain total in-plane strength, industrial users laminate sheets of fiber composites together in different orientations. Although this process necessarily reduces the original anisotropic composite strength, the primary weakness of commercial laminates remains the stiffness in the third, out-of-plane direction. Instead, if discontinuous reinforcing elements (e.g. fibers, platelets and rods) can be deliberately aligned within a composite, then isotropic reinforcement becomes a possibility.Reinforced composites often consist of strong and stiff inorganic particles dispersed in a polymeric continuous phase.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Temporal response of magnetically labeled platelets under dynamic magnetic fields
Erb Randall M., Segmehl Jana, Schaffner Manuel, Studart Andre R. (2013), Temporal response of magnetically labeled platelets under dynamic magnetic fields, in SOFT MATTER, 9(2), 498-505.
Replicating biological design principles in synthetic composites
Studart André R., Libanori Rafael, Erb Randall M. (2013), Replicating biological design principles in synthetic composites, in Fratzl Dunlop Weinkamer (ed.), RSC Publishing, London, 322-358.
Self-shaping composites with programmable bioinspired microstructures
Erb Randall M., Sander Jonathan S., Grisch Roman, Studart André R. (2013), Self-shaping composites with programmable bioinspired microstructures, in Nature Communications, 4, 1712.
Non-linear alignment dynamics in suspensions of platelets under rotating magnetic fields
Erb Randall M., Segmehl Jana, Charilaou Michalis, Loeffler Joerg F., Studart Andre R. (2012), Non-linear alignment dynamics in suspensions of platelets under rotating magnetic fields, in SOFT MATTER, 8(29), 7604-7609.
Injectable Materials with Magnetically Controlled Anisotropic Porosity
Sommer Marianne R., Erb Randall M., Studart Andre R. (2012), Injectable Materials with Magnetically Controlled Anisotropic Porosity, in ACS APPLIED MATERIALS & INTERFACES, 4(10), 5086-5091.
Locally Reinforced Polymer-Based Composites for Elastic Electronics
Erb Randall M., Cherenack Kunigunde H., Stahel Rudolf E., Libanori Rafael, Kinkeldei Thomas, Muenzenrieder Niko, Troester Gerhard, Studart Andre R. (2012), Locally Reinforced Polymer-Based Composites for Elastic Electronics, in ACS APPLIED MATERIALS & INTERFACES, 4(6), 2860-2864.
Composites Reinforced in Three Dimensions by Using Low Magnetic Fields
Erb RM, Libanori R, Rothfuchs N, Studart AR (2012), Composites Reinforced in Three Dimensions by Using Low Magnetic Fields, in SCIENCE, 335(6065), 199-204.

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Swiss Soft Days 29.10.2012 Lausanne
ACS Colloids and Interfacial Science Symposium 11.06.2012 Baltimore, USA
DGM Bio-Inspired Materials Conference 2012 20.03.2012 Potsdam, Germany
Swiss Soft Days 28.10.2011 Zurich
Euromat 2011 12.09.2011 Montpellier
American Chemical Society Fall National Meeting 28.08.2011 Denver


Communication with the public

Communication Title Media Place Year
New media (web, blogs, podcasts, news feeds etc.) Composites reinforced in 3D RSC Chemistry World International 12.01.2012
New media (web, blogs, podcasts, news feeds etc.) New family of composite structures ETH Life German-speaking Switzerland International 12.01.2012

Awards

Title Year
Best poster at DGM Bio-inspired Materials Conference 2012

Associated projects

Number Title Start Funding scheme
146509 Directed self-assembly and mechanics of bioinspired platelet-reinforced composites 01.06.2013 Project funding (Div. I-III)
100570 Stabilization mechanisms of nano-patricles in concentrated colloidal suspensions 01.04.2003 Project funding (Div. I-III)

Abstract

Due to the large strength to weight ratio of composites, their implementation as load-bearing materials is exponentially growing especially in aerospace, the automobile industry, and construction. The majority of commercial composites today are produced with aligned continuous fibers that lead to significant material strength along a single axis. To gain total in-plane strength, industrial users laminate sheets of fiber composites together in different orientations. Although this process necessarily reduces the original anisotropic composite strength, the primary weakness of commercial laminates remains the stiffness in the third, out-of-plane direction. Instead, if discontinuous reinforcing elements (e.g. fibers, platelets and rods) can be deliberately aligned within a composite, then isotropic reinforcement becomes a possibility.The goal of this research project is to exploit our recent discovery of a ultra-high response of Fe3O4-modified Al2O3 platelets under magnetic fields to construct a new class of 3-D reinforced composites. Al2O3 platelets are a leading contender for discontinuous reinforcement and can easily be modified with magnetite nanoparticles through electrostatic adsorption mechanisms. This procedure allows for the remote control of reinforcement orientation under magnetic fields that can, among numerous exciting possibilities, lead to out-of-plane platelet alignment. To achieve this goal, we will first investigate the surprising alignment effect and fast dynamics of these modified platelets in magnetic fields through methodical experimentation and model development. Next we will extend our models to other anisotropic particles frequently used as discontinuous reinforcement to prove the universality of this method. We will then incorporate modified particles into common polymer matrices and apply magnetic fields to achieve unique and interesting alignment configurations. Finally, we will measure the mechanical properties of this new class of composites and determine if contemporary theory adequately describes these systems. Since the deliberate control of reinforcement particles would help solve the primary weakness of traditional composites, a deeper understanding of and investigation into this ultra-high magnetic response in modified Al2O3 platelets is merited.
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