Department of Chemistry and Materials Science

SUPER-WEAR project

Super-stretchable functionalized materials and fibers for third generation wearable technology (Academy of Finland Research Project)
SUPER-WEAR webpage, main image. Photo by Aalto University, Maija Vaara, Mithila Mohan

 

Full title of the project: Super-stretchable functionalized materials and fibers for third generation wearable technology (Academy of Finland Research Project)

 

More about the project:

According to the European Parliament Science and Technology Options Assessment Panel, wearable technology will transform our lives. This research will tackle two of the main barriers hindering its use, namely limited deformability and the lack of autonomous power production. We will develop highly-stretchable functional textile fibers that monitor both the body biomarkers and mechanical surface deformations of their substrates. Moreover, we will design hierarchical surfaces suitable for super-stretchable electrodes that will be applied as components for stretchable organic solar cells.

The keys for success are (i) to deposit well-defined nanostructures directly on textile fibers; (ii) to design such elastomeric materials that can indicate mechanical actions with absorption colour or fluorescence emission changes; and (iii) to increase the surface area in rigid templates (metal and transparent conductive oxide electrodes) that can be lifted-off onto stretchable substrates. The stretching capacity of these functional materials and devices is crucial for their integration into irregularly curved or moving surfaces, and for their durability under external stress.

The proposed preparation methods, such as light-assisted dip-coating and flow-coating, can be scaled up from bench-top fabrication to industrial scale, such as roll-to-roll production. Moreover, these methods need minimum amount of raw materials and their waste production is as low as possible, in order to advance the resource-wise circular economy in society. Thus, the wearable technologies researched in this project will promote a paradigm shift towards more sustainable third generation wearables that integrate functional devices seamlessly into textiles and clothing.

 

Project team

 

Swarnalok De, Postdoctoral Researcher

 

"Ability to control the assembly of building blocks in an organized manner is an extremely powerful tool for fabrication of nano-to-large scale functional structures. Self-templated ordered structures can augment functional performance by summing unit properties like magnetic/piezoelectric strength or exhibit completely unprecedented properties like structural color, surface plasmon resonance etc., which are not inherently present in the individual units. Virus particles in this context are naturally occurring nanoparticles that often reported to demonstrate self-assembly behavior. 

Plant virus-based nanoparticles are ‘green’, renewable and completely non-toxic to humans. Owing to their ease of production and functionalization, plant viruses prove to be excellent building blocks for fabrication of functional nano-structures. Moreover, if we consider their monodispersity and uniformity in terms of composition, size and shape, no commercially available rod-like colloid or polymer can compete with them in this regard. Potyviruses (in our case, potato virus A, shortened as PVA) particles (VNPs) are very flexible high aspect ratio rods with interesting self-assembly properties. In this project, we will explore self-assembly behavior of PVA in detail and identify the factors governing the emergent assembly patterns. In addition, we will also design and optimize techniques for uniformly coating textile fibers with PVA VNPs. Finally, we will integrate this knowledge to produce ‘smart’ yarn materials for wearable technical textile."

Transition of PVA VNPs from random to ordered patterns upon changing buffer conditions. Image: Aalto University, Swarnalok De
Image: Aalto University, Swarnalok De

Yujiao Dong, Doctoral Candidate

 

"My current work is focused on combining the azobenzene-based supramolecular complexes with the stretchable substrate to build a double-layered structure, which could generate the wrinkle structure upon stretching. Under the light illumination, the wrinkle structure can be erased, and the rate of erasure is tunable by adjusting the azobenzene content or changing the azobenzene component. Furthermore, this azo-contained wrinkle system exhibits both photo-responsive property and larger surface area, which can be further utilized for deposition and potential applications."

 

Hoang M. Nguyen, Doctoral Candidate

 

Subproject #1: Single-step methods for controlling the morphology of nanostructured thin films
"In this project, we study the effect of the withdrawal rate and solvent selectivity on the morphology evolution of dip-coated polystyrene-b-poly(ethylene oxide) thin films by applying a wide range of dip-coating speeds and altering the volume ratio of the tetrahydrofuran-water solvent system. Notably, we have obtained a hexagonally packed BCP pattern with long-range order without the need for post-annealing processes. Overall, a solid understanding of the parameters affecting the formed surface patterns and their interplay was attained and explained, extending the knowledge of this field to more materials."

Subproject #2: Chemical lift-off lithography for direct deposition of gold nanoparticles on top of nanostructured patterns 
"In this study, we aim to deposit the nanostructured thin film with gold nanoparticles by either electrostatic interaction or chemical conjugation. The gold-decorated polymer template will then be measured in terms of LSPR signal. The project could potentially contribute to the ongoing development of bio-sensing devices and wearables."

Subproject #3: Multilevel hierarchical thin film 
"A hierarchical porous film with different levels of pore sizes can be fabricated using a simple and one-step dip-coating method. The micro-size pores can be obtained using breath figure technique while the nano-size ones are resulted from the self-assembly of block copolymer."

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Novel yet simple dip-coating method for fabricating nanopatterned thin films. Image: Aalto University, Hoang M. Nguyen

Subproject #1: Novel yet simple dip-coating method for fabricating nanopatterned thin films / Image: Aalto University, Hoang M. Nguyen

Subproject #1 (SUPER-WEAR project). Image: Aalto University, Hoang M. Nguyen

Subproject #1 / Image: Aalto University, Hoang M. Nguyen

Subproject #2 (SUPER-WEAR project). Image: Aalto University, Hoang M. Nguyen

Subproject #2 / Image: Aalto University, Hoang M. Nguyen

Subproject #3 (SUPER-WEAR project). Image: Aalto University, Hoang M. Nguyen

Subproject #3 / Image: Aalto University, Hoang M. Nguyen

Publications

Optically transparent pectin/poly(methyl methacrylate) composite with thermal insulation and UV blocking properties based on anisotropic pectin cryogel

Fangxin Zou, Hailong Li, Yujiao Dong, Girish C. Tewari, Jaana Vapaavuori 2022 Chemical Engineering Journal

Textile integrable mechanochromic strain sensor based on the interplay of supramolecular interactions

Katarzyna Wojdalska, Yujiao Dong, Jaana Vapaavuori 2021 Materials and Design

Understanding nanodomain morphology formation in dip-coated PS-b-PEO thin films

Hoang M. Nguyen, Ariane Mader, Swarnalok De, Jaana Vapaavuori 2021 Nanoscale Advances

Controllable Production of Ag/Zn and Ag Particles from Hydrometallurgical Zinc Solutions

Zulin Wang, Pyry-Mikko Hannula, Swarnalok De, Benjamin P. Wilson, Jaana Vapaavuori, Kirsi Yliniemi, Mari Lundström 2021 ACS Sustainable Chemistry and Engineering

An open-source camera system for experimental measurements

Kim Miikki, Alp Karakoç, Mahdi Rafiee, Duck Weon Lee, Jaana Vapaavuori, Jennifer Tersteegen, Laura Lemetti, Jouni Paltakari 2021 SoftwareX

Multiscale Hierarchical Surface Patterns by Coupling Optical Patterning and Thermal Shrinkage

Hamidreza Daghigh Shirazi, Yujiao Dong, Jukka Niskanen, Chiara Fedele, Arri Priimagi, Ville P. Jokinen, Jaana Vapaavuori 2021 ACS applied materials & interfaces

 

Contact information: 

Accountable project leader: Prof. Jaana Vapaavuori ([email protected])

Project team:
Swarnalok De, Postdoctoral Researcher ([email protected])
Yujiao Dong, Doctoral Candidate ([email protected])
Hoang M. Nguyen, Doctoral Candidate ([email protected])

Project page on the Research Aalto portal: SUPER-WEAR

 

Related content:

Multifunctional Materials Design

Group led by Professor Jaana Vapaavuori

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Understanding the nanostructure formation in block copolymer thin film

Recent MMD publications (Multifunctional Materials Design)

Novel yet simple dip-coating method for fabricating nanopatterned thin films. Image: Aalto University, Hoang M. Nguyen
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