Search results for: André R. Studart

Items from 1 to 20 out of 59 results

article

Stretchable Soft Composites with Strain‐Induced Architectured Color

Erik Poloni, Ahmad Rafsanjani, Vadim Place, David Ferretti, more

Colors enable interaction and communication between living species in a myriad of biological and artificial environments. While living organisms feature low‐power mechanisms to dynamically control color in soft tissues, man‐made color‐changing devices remain predominantly rigid and energy intensive. Here, architectured composites that display striking color changes when stretched in selective directions...

article

Stretchable Soft Composites with Strain‐Induced Architectured Color (Adv. Mater. 6/2022)

Erik Poloni, Ahmad Rafsanjani, Vadim Place, David Ferretti, more

Advanced Materials > 34 > 6 > n/a - n/a

Orientation‐Dependent Color In article number 2104874, Ahmad Rafsanjani, André R. Studart, and co‐workers report soft architectured composites that display striking orientation‐dependent color changes when stretched. The color change results from the rotation of pre‐aligned reflective coated platelets embedded in a soft polymer matrix in a well‐defined architecture. A soft robotic actuator that turns...

article

Spin‐Printing of Liquid Crystal Polymer into Recyclable and Strong All‐Fiber Materials

Silvan Gantenbein, Chiara Mascolo, Caroline Houriet, Robert Zboray, more

Advanced Functional Materials > 31 > 52 > n/a - n/a

Fiber‐reinforced polymers are widely used as lightweight materials in aircraft, automobiles, wind turbine blades, and sports products. Despite the beneficial weight reduction achieved in such applications, these composites often suffer from poor recyclability and limited geometries. 3D printing of liquid crystal polymers into complex‐shaped all‐fiber materials is a promising approach to tackle these...

article

3D Printed Scaffolds for Monolithic Aerogel Photocatalysts with Complex Geometries

Murielle Schreck, Nicole Kleger, Fabian Matter, Junggou Kwon, more

Small > 17 > 50 > n/a - n/a

Monolithic aerogels composed of crystalline nanoparticles enable photocatalysis in three dimensions, but they suffer from low mechanical stability and it is difficult to produce them with complex geometries. Here, an approach to control the geometry of the photocatalysts to optimize their photocatalytic performance by introducing carefully designed 3D printed polymeric scaffolds into the aerogel monoliths...

article

Ultrastrong Hierarchical Porous Materials via Colloidal Assembly and Oxidation of Metal Particles

Wenlong Huo, Xiaoyan Zhang, Elena Tervoort, Silvan Gantenbein, more

Advanced Functional Materials > 30 > 38 > n/a - n/a

Porous materials are useful as lightweight structures, bone substitutes, and thermal insulators, but exhibit poor mechanical properties compared to their dense counterparts. Biological materials such as bone and bamboo are able to circumvent this trade‐off between porosity and mechanical performance by combining pores at multiple length scales. Inspired by these biological architectures, a manufacturing...

article

Transparent Nacre‐like Composites Toughened through Mineral Bridges

Tommaso Magrini, Simon Moser, Madeleine Fellner, Alessandro Lauria, more

Advanced Functional Materials > 30 > 27 > n/a - n/a

Bulk materials with remarkable mechanical properties have been developed by incorporating design principles of biological nacre into synthetic composites. However, this potential has not yet been fully leveraged for the fabrication of tough and strong materials that are also optically transparent. In this work, a manufacturing route that enables the formation of nacre‐like mineral bridges in a bioinspired...

article

Complex‐Shaped Cellulose Composites Made by Wet Densification of 3D Printed Scaffolds

Michael K. Hausmann, Gilberto Siqueira, Rafael Libanori, Dimitri Kokkinis, more

Advanced Functional Materials > 30 > 4 > n/a - n/a

Cellulose is an attractive material resource for the fabrication of sustainable functional products, but its processing into structures with complex architecture and high cellulose content remains challenging. Such limitation has prevented cellulose‐based synthetic materials from reaching the level of structural control and mechanical properties observed in their biological counterparts, such as wood...

article

3D Printing: Complex‐Shaped Cellulose Composites Made by Wet Densification of 3D Printed Scaffolds (Adv. Funct. Mater. 4/2020)

Michael K. Hausmann, Gilberto Siqueira, Rafael Libanori, Dimitri Kokkinis, more

Advanced Functional Materials > 30 > 4 > n/a - n/a

Cellulose, extracted from wood, is a renewable and biodegradable material that can find potential applications in the biomedical, electronic, and food industries. In article number 1904127, Gilberto Siqueira, Rafael Libanori, and André R. Studart show that cellulose nanofibrils or cellulose nanocrystals can be aligned at the microscale and shaped into unique geometries at the macroscale during the...

article

Cellulose‐Based Microparticles for Magnetically Controlled Optical Modulation and Sensing

Michael K. Hausmann, Alina Hauser, Gilberto Siqueira, Rafael Libanori, more

Small > 16 > 1 > n/a - n/a

Responsive materials with birefringent optical properties have been exploited for the manipulation of light in several modern electronic devices. While electrical fields are often utilized to achieve optical modulation, magnetic stimuli may offer an enticing complementary approach for controlling and manipulating light remotely. Here, the synthesis and characterization of magnetically responsive birefringent...

article

3D Printing of Salt as a Template for Magnesium with Structured Porosity

Nicole Kleger, Martina Cihova, Kunal Masania, André R. Studart, more

Advanced Materials > 31 > 37 > n/a - n/a

Porosity is an essential feature in a wide range of applications that combine light weight with high surface area and tunable density. Porous materials can be easily prepared with a vast variety of chemistries using the salt‐leaching technique. However, this templating approach has so far been limited to the fabrication of structures with random porosity and relatively simple macroscopic shapes. Here,...

article

3D Printing: 3D Printing of Salt as a Template for Magnesium with Structured Porosity (Adv. Mater. 37/2019)

Nicole Kleger, Martina Cihova, Kunal Masania, André R. Studart, more

Advanced Materials > 31 > 37 > n/a - n/a

In article number 1903783, Martina Cihova, André R. Studart, Jörg F. Löffler, and co‐workers present a rheologically engineered salt paste as a sacrificial 3D‐printing ink for the structuring of porous magnesium (Mg) scaffolds. The ability to structure the porosity in Mg is highly attractive for its use as a resorbable bone replacement because it enables spatial tuning of the pore distribution to...

article

Oxide-Free Copper Pastes for the Attachment of Large-Area Power Devices

Luca Carro, Alfred A. Zinn, Patrick Ruch, Florian Bouville, more

Journal of Electronic Materials > 2019 > 48 > 10 > 6823-6834

Pastes based on copper (Cu) nanoparticles (NPs) are promising electronic-packaging materials for the attachment of high-power devices. However, the rapid oxidation of nanostructured Cu requires the use of reducing agents during processing, which makes it less suitable for attaching large-area dies (> 4 mm²). Recently, the functionalization of Cu-NP surfaces with a mixture of amines prevented oxidation,...

article

Hierarchical Toughening of Nacre‐Like Composites

Madeleine Grossman, Dmitriy Pivovarov, Florian Bouville, Clemens Dransfeld, more

Advanced Functional Materials > 29 > 9 > n/a - n/a

Reinforced polymer‐based composites are attractive lightweight materials for aircrafts, automobiles, and turbine blades, but still show strength and fracture toughness lower than traditional metals. An interesting approach to address this issue is to fabricate composites with structural features that absorb part of the elastic energy stored in the material during fracture through extrinsic and intrinsic...

article

Controlled Massive Encapsulation via Tandem Step Emulsification in Glass

Alessandro Ofner, Iacopo Mattich, Michael Hagander, Alessandro Dutto, more

Advanced Functional Materials > 29 > 4 > n/a - n/a

Controlled encapsulation is important in pharmaceutics, agriculture, food products, and in emerging materials applications. Microfluidics offers a compelling approach to create controlled emulsions and microcapsules for these applications, but upscaling of this technology for the robust encapsulation of chemically diverse active ingredients is not yet demonstrated. Here, it is shown that microfluidic...

article

On the Evaporation of Colloidal Suspensions in Confined Pillar Arrays

Jonas Zürcher, Brian R. Burg, Luca Carro, André R. Studart, more

Transport in Porous Media > 2018 > 125 > 2 > 173-192

The thermal and electrical transport capabilities of materials in electronic packaging are key to supporting high-performance microelectronic systems. In composite and hybrid materials, both of these transport capabilities are limited by contact resistances. We propose a directed nanoparticle assembly method to reduce contact resistances by transforming point contacts between micrometer-sized objects...

article

3D Printing of Materials with Tunable Failure via Bioinspired Mechanical Gradients

Dimitri Kokkinis, Florian Bouville, André R. Studart

Advanced Materials > 30 > 19 > n/a - n/a

Mechanical gradients are useful to reduce strain mismatches in heterogeneous materials and thus prevent premature failure of devices in a wide range of applications. While complex graded designs are a hallmark of biological materials, gradients in manmade materials are often limited to 1D profiles due to the lack of adequate fabrication tools. Here, a multimaterial 3D‐printing platform is developed...

article

Nacre-like ceramic refractories for high temperature applications

Pedro I.B.G.B. Pelissari, Florian Bouville, Victor C. Pandolfelli, Davide Carnelli, more

Journal of the European Ceramic Society > 2018 > 38 > 4 > 2186-2193

High-temperature ceramics, so-called refractories, are widely used for the manufacturing of metals, for energy generation and aerospace applications. Refractories are usually strong and stiff but fragile due to the lack of plastic deformation and other intrinsic toughening mechanisms. This inherent brittleness limits their use in applications where catastrophic failure is not tolerated. The present...

article

Silk fibroin scaffolds with inverse opal structure for bone tissue engineering

Marianne R. Sommer, Jolanda R. Vetsch, Jessica Leemann, Ralph Müller, more

Journal of Biomedical Materials Research Part B: Applied Biomaterials > 105 > 7 > 2074 - 2084

How scaffold porosity, pore diameter and geometry influence cellular behavior is‐although heavily researched ‐ merely understood, especially in 3D. This is mainly caused by a lack of suitable, reproducible scaffold fabrication methods, with processes such as gas foaming, lyophilization or particulate leaching still being the standard. Here we propose a method to generate highly porous silk fibroin...

chapter

Direct investigation of microparticle self-assembly to improve the robustness of neck formation in thermal underfills

Roman Stadler, Luca Del Carro, Jonas Zurcher, Gerd Schlottig, more

2017 16th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm) > 167 - 173

2017 16th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm)

A high thermal conductivity of the underfill material is key for efficient heat removal from 3D chip stacks. Recently, the excellent thermal properties of underfills in which nanoparticle self-assembly formed necks between the filler particles were demonstrated. To industrially apply neck-based thermal underfills, the robustness of neck formation must be improved. Accordingly, it is crucial to understand...

article

Mode I transverse intralaminar fracture in glass fiber-reinforced polymers with ductile matrices

Davi M. Montenegro, Francesco Bernasconi, Markus Zogg, Matthias Gössi, more

Composite Structures > 2017 > 165 > C > 65-73

The fracture toughness of laminated composite materials is a very important property for damage-tolerant design, but remains poorly understood under transverse mechanical loading conditions. In this study, the transverse intralaminar fracture in unidirectional laminates with ductile polymer matrices is investigated. The presence of a ductile matrix calls for the use of concepts of nonlinear fracture...

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Search results for: André R. Studart

Stretchable Soft Composites with Strain‐Induced Architectured Color

Stretchable Soft Composites with Strain‐Induced Architectured Color (Adv. Mater. 6/2022)

Spin‐Printing of Liquid Crystal Polymer into Recyclable and Strong All‐Fiber Materials

3D Printed Scaffolds for Monolithic Aerogel Photocatalysts with Complex Geometries

Ultrastrong Hierarchical Porous Materials via Colloidal Assembly and Oxidation of Metal Particles

Transparent Nacre‐like Composites Toughened through Mineral Bridges

Complex‐Shaped Cellulose Composites Made by Wet Densification of 3D Printed Scaffolds

3D Printing: Complex‐Shaped Cellulose Composites Made by Wet Densification of 3D Printed Scaffolds (Adv. Funct. Mater. 4/2020)

Cellulose‐Based Microparticles for Magnetically Controlled Optical Modulation and Sensing

3D Printing of Salt as a Template for Magnesium with Structured Porosity

3D Printing: 3D Printing of Salt as a Template for Magnesium with Structured Porosity (Adv. Mater. 37/2019)

Oxide-Free Copper Pastes for the Attachment of Large-Area Power Devices

Hierarchical Toughening of Nacre‐Like Composites

Controlled Massive Encapsulation via Tandem Step Emulsification in Glass

On the Evaporation of Colloidal Suspensions in Confined Pillar Arrays

3D Printing of Materials with Tunable Failure via Bioinspired Mechanical Gradients

Nacre-like ceramic refractories for high temperature applications

Silk fibroin scaffolds with inverse opal structure for bone tissue engineering

Direct investigation of microparticle self-assembly to improve the robustness of neck formation in thermal underfills

Mode I transverse intralaminar fracture in glass fiber-reinforced polymers with ductile matrices

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