René Michel Rossi

René Michel Rossi
Empa - Swiss Federal Laboratories for Materials Science and Technology | Empa · Department Materials meet Life

PhD

About

401
Publications
122,705
Reads
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6,450
Citations
Citations since 2016
222 Research Items
5330 Citations
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201620172018201920202021202202004006008001,000
201620172018201920202021202202004006008001,000
Additional affiliations
May 2020 - September 2020
ETH Zurich
Position
  • Professor (Associate)
Description
  • Sports Physiology - Exercise in heat and cold Smart textiles
September 2006 - present
ETH Zurich
Position
  • Lecturer
Description
  • Thermoregulation and sports textiles
January 2003 - present
Empa - Swiss Federal Laboratories for Materials Science and Technology
Position
  • Lab Head

Publications

Publications (401)
Article
Over the past few decades, several models of heat and mass transfer have been based on the assumption of the homogeneous thickness (or absence) of the enclosed air layer contradicting the real-life scenario of the skin-clothing-environment system. To address this research gap, in this study, the comprehensive model for heat and mass transfer was de...
Article
Full-text available
SARS-CoV-2 spreads via droplets, aerosols, and smear infection. From the beginning of the COVID-19 pandemic, using a facemask in different locations was recommended to slow down the spread of the virus. To evaluate facemasks' performance, masks' filtration efficiency is tested for a range of particle sizes. Although such tests quantify the blockage...
Preprint
Full-text available
Background: Pressure Injuries are not exclusively an adult phenomenon; various risk factors contribute to a high prevalence rate of 43% in the neonatal and pediatric intensive care population. Effective preventive measures in this population are limited. Methods: We performed a pilot study to analyze the distribution and localization of support sur...
Article
The infrared radiative heat from the human body accounts for more than 60% of dry heat loss. Textiles with mid-infrared (MIR) transparency can help achieve good radiative personal cooling and potentially save energy on building refrigeration. The interaction between MIR light and textiles is complex, involving fibre materials and yarn structure par...
Article
Full-text available
Thermophysiological comfort is known to play a primary role in maintaining thermal balance, which corresponds to a person’s satisfaction with their immediate thermal environment. Among the existing test methods, sweating torsos are one of the best tools to provide a combined measurement of heat and moisture transfer using non-isothermal conditions....
Article
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Optical fibres enable to design of new textile-based sensors for an unobtrusive, continuous, and long-term acquisition of photoplethysmography (PPG) signals. However, no research has been done about the accuracy of measuring blood oxygen saturation (SpO 2 ) and the feasibility of PPG-based blood pressure measurement. This proof-ofconcept study exam...
Preprint
Fentanyl transdermal therapy is a suitable treatment for moderate-to-severe cancer-related pain. Patients show inter-individual drug uptake behavior, which leads to a different response to the therapy. This study aims to determine the effect of different physiological features of the patients on the pain relief achieved with the therapy. Therefore,...
Chapter
Hydrogel fibers share many characteristics of fiber materials such as high aspect ratio and surface‐to‐volume ratio, good flexibility and handleability, meanwhile inheriting the unique tissue‐mimetic properties of bulk hydrogels. Therefore, the convergence of the hydrogel and fiber properties makes hydrogel fibers particularly attractive biomateria...
Article
Pronounced fingering of the waterfront is observed for in-plane wicking in thin, aligned electrospun fibrous membranes. We hypothesize that a perturbation in capillary pressure triggers the onset of fingering, which grows in a non-local manner based on the waterfront gradient. Vertical and horizontal wicking in thin electrospun membranes of poly(et...
Article
Full-text available
The COVID–19 pandemic has caused considerable interest worldwide in antiviral surfaces, and there has been a dramatic increase in the research and development of innovative material systems to reduce virus transmission in the past few years. The International Organization for Standardization (ISO) norms 18,184 and 21,702 are two standard methods to...
Preprint
SARS-CoV-2 spreads via droplets, aerosols, and smear infection. From the beginning of the COVID-19 pandemic, using a facemask in different locations was recommended to slow down the spread of the virus. To evaluate facemasks' performance, masks' filtration efficiency is tested for a range of particle sizes. Although such tests quantify the blockage...
Article
Hypothesis Wicking flow in the wale direction of knit fabrics is slowed by capillary pressure minima during the transition at yarn contacts. The characteristic pore structure of yarns leads to an unfavorable free energy evolution and is the cause of these minima. Experiments Time-resolved synchrotron tomographic microscopy is employed to study the...
Article
Full-text available
Electrospun nanofibers have shown great potential as drug vehicles and tissue engineering scaffolds. However, the successful encapsulation of multiple hydrophilic/hydrophobic therapeutic compounds is still challenging. Herein, sodium alginate/poly(ε-caprolactone) core/shell nanofibers were fabricated via water-in-oil emulsion electrospinning. The s...
Article
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The concentration of glucose in the body's fluids is an important parameter that can indicate pathological conditions such as the progress of infected wounds. Several wearables and implantable detection approaches have been developed with high selectivity and sensitivity for glucose. However, all of them have drawbacks such as low stability, limite...
Article
The spontaneous imbibition of a liquid within porous media, known as wicking, can display uncommon features in textiles and yarns. Yarns exhibited step-wise wicking dynamics not captured by current models. Hypothesis Wicking dynamics in yarns not only depend on inter-fiber pore filling, but are mainly determined by the pore-to-pore transition proc...
Article
The rising interest in designing fibres via spinning techniques combining the properties of various polymeric materials into advanced functionalised materials is directed towards targeted biomedical applications such as drug delivery, wearable sensors or tissue engineering. Understanding how these functional polymers exhibit multiscale structures r...
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After the spread of COVID-19, surgical masks became highly recommended to the public. They tend to be handled and used multiple times, which may impact their performance. To evaluate this risk, surgical masks of Type IIR were submitted to four simulated treatments: folding, ageing with artificial saliva or sweat and washing cycles. The air permeabi...
Article
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In recent years, Förster resonance energy transfer (FRET) and related topics have received marked attention both as a subject of scientific investigation and due to its many potential applications. However, the state‐of‐the‐art matrix materials for the FRET need to be improved in terms of universal loading for all types of luminescent moieties and...
Article
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Electrospinning evolved as a powerful technology to produce membranes consisting of nano- to micron-scaled fibers offering unique membrane properties due to the extremely high surface-to-volume ratio and high membrane porosity. However, this technology is often far removed from a green and environmentally-friendly process, as it employs solvents wi...
Article
Metal‐Organic Framework Film In article number 2100871, Lars Lüder, Michael Calame, and coworkers present a metal organic‐framework film, which shows good electrical conductivity and basic chemiresistive response towards ambient environmental changes, originated by the interaction between the analytes and the metal organic‐framework when entering t...
Article
Current biointerfaces aiming to steer specific biological responses frequently lack either stability due to purely electrostatic interactions, bioactivity due to unspecific conjugation chemistries, specificity due to uncontrolled biological interactions such as fouling, or cytocompatibility due to harsh and toxic coating procedures. Here, we report...
Article
Full-text available
The objective measurement of fatigue is of critical relevance in areas such as occupational health and safety as fatigue impairs cognitive and motor performance, thus reducing productivity and increasing the risk of injury. Wearable systems represent highly promising solutions for fatigue monitoring as they enable continuous, long-term monitoring o...
Article
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Electrically conductive metal–organic frameworks (MOFs) and MOF-like coordination polymers are an emerging class of materials that combine good electrical charge transport with unique properties such as nanoporosity. The combination of different metal nodes and organic linkers allows tailoring MOFs to specific properties and applications in electro...
Article
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Fiber solar cells have attracted considerable interest in recent years for their agile integration with wearable electronics. They have the unique advantage of collecting light from all directions. However, in daily use, the incoming sunlight only covers the face-up surface area and a large portion of it is lost between fiber gaps, leading to an un...
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Electrospinning is a versatile technique to produce nanofibrous membranes with applications in filtration, biosensing, biomedical and tissue engineering. The structural and therefore physical properties of electrospun fibers can be finely...
Article
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Transparent face masks are the ultimate solution for improving communication during pandemic times while at the same time slowing the spread of pathogens. Here, we demonstrate an easily scalable process consisting of directly electrospinning polyamide nanofibers onto a mechanical stable substrate made of poly(lactic acid) by a needleless setup for...
Article
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Controlling the architecture of engineered scaffolds is of outmost importance to induce a targeted cell response and ultimately achieve successful tissue regeneration upon implantation. Robust, reliable and reproducible methods to control scaffold properties at different levels are timely and highly important. However, the multiscale architectural...
Article
Full-text available
For accurate prediction of thermal protective performance of firefighter clothing, a realistic assumption about the heterogeneous distribution of air gaps underneath the clothing is necessary. In this study, a numerical model of heat transfer through realistic heterogeneous air gaps under flash fire exposure was developed. First, the models of heat...
Article
An analytical clothing model is developed to consider the effect of body movement on heat transfer. This model quantifies the impact of forced convection in an enclosed air layer and the effect of ventilation (through fabric pores and ensemble openings) on clothing insulation. The internal air speed (inside an enclosed air layer) caused by human mo...
Article
Full-text available
To improve the measurement and subsequent use of human skin temperature (Tsk) data, there is a need for practical methods to compare Tsk sensors and to quantify and better understand measurement error. We sought to develop, evaluate, and utilize a skin model with skin-like thermal properties as a tool for benchtop Tsk sensor comparisons and assessm...
Article
Full-text available
The surface functionalization of electrospun nanofibers allows for the introduction of additional functionalities while at the same time retaining the membrane properties of high porosity and surface-to-volume ratio. In this work, we sequentially deposited layers of chitosan and alginate to form a polyelectrolyte complex via layer-by-layer assembly...
Article
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In article number 2101337, Xiao‐Hua Qin and co‐workers report a modular thiol–ene resin for ultrafast two‐photon microfabrication of complex objects and facile postmodification using a series of donor–acceptor Stenhouse adduct photoswitches. When exposed to light, the C60 microstructures undergo reversible color‐changing by photoisomerization.
Article
Full-text available
Electrospun nanofibrous membranes offer superior properties over other polymeric membranes not only due to their high membrane porosity but also due to their high surface-to-volume ratio. A plethora of available polymers and post-modification methods allow the incorporation of "smart" responsiveness in fiber membranes. The pH-responsive property is...
Article
Full-text available
Structural colors are produced by wavelength-dependent scattering of light from nanostructures. While living organisms often exploit phase separation to directly assemble structurally colored materials from macromolecules, synthetic structural colors are typically produced in a two-step process involving the sequential synthesis and assembly of bui...
Article
What are the mechanisms at play in the spontaneous imbibition dynamics in polyethylene terephthalate filament yarns at pore scale? Processes at pore scale such as waiting times between the filling of two neighboring pores, as observed in special irregular porous media, like yarns, may overrule the predicted behavior by well-known laws such as Washb...
Article
Thermal ablation has attracted attention as a minimally invasive tissue ablation treatment. Steam flow was recently introduced as a novel ablation procedure. This work aimed to assess the applicability of pulsated steam flow for tumor ablation. Ex vivo ablation was performed using liver, muscle, and fat tissues of sheep. Three experimental protocol...
Article
Full-text available
Molecular photoswitches that can reversibly change color upon irradiation are promising materials for applications in molecular actuation and photoresponsive materials. However, the fabrication of photochromic devices is limited to conventional approaches such as mold casting and spin‐coating, which cannot fabricate complex structures. Reported her...
Article
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Transdermal drug delivery systems are a key technology to administer drugs with a high first-pass effect in a non-invasive and controlled way. Physics-based modeling and simulation are on their way to become a cornerstone in the engineering of these healthcare devices since it provides a unique complementarity to experimental data and additional in...
Article
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To avoid excessive usage of antibiotics and antimicrobial agents, smart wound dressings permitting controlled drug release for treatment of bacterial infections are highly desired. In search of a sensitive stimulus to activate drug release under physiological conditions, we found that the glass transition temperature (Tg) of a polymer or polymer bl...
Article
Full-text available
Thanks to its negative surface charge and high swelling behavior, montmorillonite (MMT) has been widely used to design hybrid materials for applications in metal ion adsorption, drug delivery, or antibacterial substrates. The changes in photophysical and photochemical properties observed when fluorophores interact with MMT make these hybrid materia...
Article
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The detection of oxygen (O2) by optical sensors is of growing importance, for example, in biology, life science, environmental science, and aerodynamics, where the composition of gases is crucial for many applications. Purely organic optical O2 sensors are very attractive for monitoring food deterioration, biosensing, and biomonitoring, as they can...
Article
Full-text available
Fibrosis and scar formation is a medical condition observed under various circumstances, ranging from skin wound healing to cardiac deterioration after myocardial infarction. Among other complex interdependent phases during wound healing, fibrosis is associated with an increased fibroblast to myofibroblast transition. A common hypothesis is that de...
Article
Full-text available
The heat protective performance of thermal protective fabrics is related to the multiscale structure of the fibrous material and the composite design of a multilayered fabric system. In this study, a molecular interpretation is provided to explain the structural changes within fibers to correlate with the mechanical properties of the outermost laye...
Article
Full-text available
Electronic textile (E‐textile), an emerging technology, has the potential to revolutionize consumer electronics by transforming them into wearable devices. Highly conductive, textile conductors, suitable for commercialization, have yet not been developed. Here, a new metal‐textile laser welding method is presented for a rapid one‐step, stable, and...
Article
Human thermoregulation models, particularly the Fiala model, are well accepted for the prediction of thermoregulatory responses and the assessment of clothing and building systems with regard to human thermal comfort. However, the convective heat transfer coefficients (hc), used for the heat transfer calculations, were obtained from measurements wi...
Article
Full-text available
Wearable devices for remote and continuous health monitoring in older populations frequently include sensors for body temperature measurements (i.e., skin and core body temperatures). Healthy aging is associated with core body temperatures that are in the lower range of age-related normal values (36.3 ± 0.6 • C, oral temperature), while patients wi...
Preprint
Full-text available
Structural colors are produced by wavelength-dependent scattering of light from nanostructures. While living organisms often exploit phase separation to directly assemble structurally colored materials from macromolecules, synthetic structural colors are typically produced in a two-step process involving the sequential synthesis and assembly of bui...
Preprint
Transdermal fentanyl patches are an effective alternative to the sustained-release of oral morphine for chronic pain treatment. Due to the narrow therapeutic range of fentanyl, the fentanyl concentration in the blood needs to be controlled carefully. Only then, effective pain relief can be reached while avoiding adverse effects such as respiratory...
Article
Full-text available
The development of hybrid materials with unique optical properties has been a challenge for the creation of high-performance composites. The improved photophysical and photochemical properties observed when fluorophores interact with clay minerals, as well as the accessibility and easy handling of such natural materials, make these nanocomposites a...
Article
Background Digital twins have advanced fast in various industries, but are just emerging in postharvest supply chains. A digital twin is a virtual representation of a certain product, such as fresh horticultural produce. This twin is linked to the real-world product by sensors supplying data of the environmental conditions near the target fruit or...