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Esther Amstad

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Related publications (100)

Page 4 of 5

3D Printable κ‐Carrageenan‐Based Granular Hydrogels

Esther Amstad, Francesca Bono

𝜿-carrageenan, an algae-extracted polysaccharide known for its emulsifying properties, is widely used in food and beauty products. Because of its abundance in nature, similarity to natural glycosaminoglycans, and biocompatibility, it is a promising alterna ...

Wiley2024

Clogging in parallelized tapered microfluidic channels

Esther Amstad

Nearly all tubes and pores used to transport solids in fluids, such as arteries and filters, are subject to clogging. The length scales and geometries of these tubes are well defined. In spite of this knowledge, the collective clogging behavior of multiple ...

Springer Heidelberg2016

From vesicles to materials: bioinspired strategies for fabricating hierarchically structured soft matter

Esther Amstad

Certain organisms including species of mollusks, polychaetes, onychophorans and arthropods produce exceptional polymeric materials outside their bodies under ambient conditions using concentrated fluid protein precursors. While much is understood about the ...

ROYAL SOC2021

3D Printing of Double Network Granular Elastomers with Locally Varying Mechanical Properties

Benjamin François Régis Tiberghien, Esther Amstad, Eva Jeanne Baur

Fast advances in the design of soft actuators and robots demand for new soft materials whose mechanical properties can be changed over short length scales. Elastomers can be formulated as highly stretchable or rather stiff materials and hence, are attracti ...

Wiley-V C H Verlag Gmbh2024

Bioinspired Viscoelastic Capsules: Delivery Vehicles and Beyond

Esther Amstad, Gianluca Nicolas Etienne, Irvine Lian Hao Ong

Microcapsules are often used as individually dispersed carriers of active ingredients to prolong their shelf life or to protect premature reactions with substances contained in the surrounding. This study goes beyond this application and employs microcapsu ...

Wiley2019

Monodisperse Selectively Permeable Hydrogel Capsules Made from Single Emulsion Drops

Esther Amstad, Alexandre Louis André Persat, Huachuan Du, Mathias Steinacher, Alice Cont

Capsules are often used to protect chemical and biological entities from the environment, to control the timing and location of their release, or to facilitate the collection of waste. Their performance depends on the thickness and composition of their she ...

2021

Hydroelastomers: soft, tough, highly swelling composites

Esther Amstad, Michael David Kessler

Inspired by the cellular design of plant tissue, we present an approach to make versatile, tough, highly water-swelling composites. We embed highly swelling hydrogel particles inside tough, water-permeable, elastomeric matrices. The resulting composites, w ...

ROYAL SOC CHEMISTRY2022

Influence of the hydrophile-lipophile balance of perfluorinated surfactants on the emulsion stability

Esther Amstad, Gaia De Angelis

Emulsions are omnipresent in our everyday life; for example, in food, certain drug and cosmetic formulations, agriculture, and as paints. Moreover, they are frequently used to perform high-throughput screening assays with minimum sample volumes. Key to the ...

Springer Heidelberg2024

Reversible Oxygen Sensing Based on Multi-Emission Fluorescence Quenching

Esther Amstad, Efe Armagan

Oxygen is ubiquitous in nature and it plays a key role in several biological processes, such as cellular respiration and food deterioration, to name a few. Currently, reversible and non-destructive oxygen sensing is usually performed with sensors produced ...

2020

Spray-Assisted Formation of Micrometer-Sized Emulsions

Esther Amstad, Mathias Steinacher

Emulsion drops with defined sizes are frequently used to conduct chemical reactions on picoliter scales or as templates to form microparticles. Despite tremendous progress that has been achieved in the production of emulsions, the high throughput formation ...

AMER CHEMICAL SOC2022

Production of monodisperse drops from viscous fluids

Esther Amstad, Mathias Steinacher, Armend Gazmeno Hati, Tomasz Radoslaw Szymborski

Drops are often used as picoliter-sized reaction vessels, for example for high-throughput screening assays, or as templates to produce particles of controlled sizes and compositions. Many of these applications require close control over the size of drops, ...

2018

Creation of Faceted Polyhedral Microgels from Compressed Emulsions

Esther Amstad

Compressed monodisperse emulsions in confined space exhibit highly ordered structures. The influence of the volume fraction and the confinement geometry on the organized structures is investigated and the mechanism by which structural transition occurs is ...

Wiley-V C H Verlag Gmbh2017

Microfluidic device for real-time formulation of reagents and their subsequent encapsulation into double emulsions

Esther Amstad, Sebastian Maerkl, Zoe Newell Swank, Jui-Chia Chang

Emulsion drops are often employed as picoliter-sized containers to perform screening assays. These assays usually entail the formation of drops encompassing discrete objects such as cells or microparticles and reagents to study interactions between the dif ...

Nature Research2018

Leveraging Liquid-Liquid Interfaces to Assemble Responsive Vesicles

Esther Amstad

Schweizerische Chemische Gesellschaft2014

Crystallization of undercooled liquid fenofibrate

Esther Amstad

Formulation of hydrophobic drugs as amorphous materials is highly advantageous as this increases their solubility in water and therefore their bioavailability. However, many drugs have a high propensity to crystallize during production and storage, limitin ...

Royal Society of Chemistry2015

Hydrogel-Encased Photonic Microspheres with Enhanced Color Saturation and High Suspension Stability

Esther Amstad

Regular arrays of colloidal particles can produce striking structural colors without the need for any chemical pigments. Regular arrays of colloidal particles can be processed into microparticles via emulsion templates for use as structural colorants. Phot ...

Amer Chemical Soc2023

Bio-Informed Porous Mineral-Based Composites

Esther Amstad, Ran Zhao

Certain biominerals, such as sea sponges and echinoderm skeletons, display a fascinating combination of mechanical properties and adaptability due to the well-defined structures spanning various length scales. These materials often possess high density nor ...

WILEY-V C H VERLAG GMBH2024

Controlling the crystal structure of succinic acid via microfluidic spray-drying

Esther Amstad, Aysu Ceren Okur

Many properties of materials, including their dissolution kinetics, hardness, and optical appearance, depend on their structure. Unfortunately, it is often difficult to control the structure of low molecular weight organic compounds that have a high propen ...

ROYAL SOC CHEMISTRY2023

Parallelization of microfluidic flow-focusing devices

Esther Amstad

Microfluidic flow-focusing devices offer excellent control over fluid flow, enabling formation of drops with a narrow size distribution. However, the throughput of microfluidic flow-focusing devices is limited and scale-up through operation of multiple dro ...

Amer Physical Soc2017

Everything in its right place: controlling the local composition of hydrogels using microfluidic traps

François Gallaire, Esther Amstad, Michael David Kessler, Hervé Stéphane Elettro

Many natural materials display locally varying compositions that impart unique mechanical properties to them which are still unmatched by manmade counterparts. Synthetic materials often possess structures that are well-defined on the molecular level, but p ...

ROYAL SOC CHEMISTRY2020