A5078251022- Surface Modification and Superhydrophobicity
- Material Properties and Processing
- Electrohydrodynamics and Fluid Dynamics
- biodegradable polymer synthesis and properties
- Aerosol Filtration and Electrostatic Precipitation
- Nanocomposite Films for Food Packaging
- Semiconductor materials and devices
- Recycling and Waste Management Techniques
- Microplastics and Plastic Pollution
- Advanced Cellulose Research Studies
- Polymer crystallization and properties
- Fluid Dynamics and Heat Transfer
- Copper Interconnects and Reliability
- Pickering emulsions and particle stabilization
- Catalytic Processes in Materials Science
- Silicone and Siloxane Chemistry
- Mechanical Behavior of Composites
- Aerogels and thermal insulation
- Advanced Photocatalysis Techniques
- Plasma Applications and Diagnostics
- Advanced Sensor and Energy Harvesting Materials
- Adhesion, Friction, and Surface Interactions
- Icing and De-icing Technologies
- Plasma Diagnostics and Applications
- Natural Fiber Reinforced Composites
Tampere University
2015-2024
Materials Science & Engineering
2021
Tampere University of Applied Sciences
2001-2017
Pulp and Paper Research Institute
2010
Wettability of a solid surface by liquid plays an important role in several phenomena and applications, for example adhesion, printing, self‐cleaning. In particular, wetting rough surfaces has attracted great scientific interest recent decades. Superhydrophobic surfaces, which possess extraordinary water repelling properties due to their low energy specific nanometer‐ micrometer‐scale roughness, are particular the variety potential applications ranging from self‐cleaning microfluidic...
Recent years have seen an increased interest toward utilizing biobased and biodegradable materials for barrier packaging applications. Most of the abovementioned usually certain shortcomings that discourage their adoption as a preferred material choice. Nanocellulose falls into such category. It has excellent against grease, mineral oils, oxygen but poor tolerance water vapor, which makes it unsuitable to be used at high humidity. In addition, nanocellulose suspensions' viscosity yield...
Hierarchical roughness is known to effectively reduce the liquid-solid contact area and water droplet adhesion on superhydrophobic surfaces, which can be seen for example in combination of submicrometer micrometer scale structures lotus leaf. The fine structures, are often referred as nanostructures literature, have an important role phenomenon superhydrophobicity low adhesion. Although generally termed nanostructures, their actual dimensions at hundreds nanometers. Here we demonstrate that...
Paper-based devices provide an alternative technology for simple, low-cost, portable, and disposable diagnostic tools many applications, including clinical diagnosis, food quality control, environmental monitoring. In this study we report a two-step fabrication process creating two-dimensional microfluidic channels to move liquids on hydrophobized paper surface. A highly hydrophobic surface was created by TiO2 nanoparticle coating using high-speed, roll-to-roll liquid flame spray technique....
Extremely hydrophobic surfaces, on which water droplets sit in a spherical shape leaving air entrapped into the roughness of solid, are often called superhydrophobic. Hierarchically rough superhydrophobic surfaces that possess submicron scale fine structures combined with micron generally more hydrophobic, and droplet adhesion to those is lower comparison possessing purely micrometric structures. In other words, usually structure surface reduces liquid-solid contact area adhesion. Here we...
Abstract Surface engineering can be used to prevent ice accumulation and adhesion in environments that deal with icing problems. One recent approach, slippery liquid infused porous surfaces (SLIPS), comprises a smooth lubricating surface, where lubricant is trapped within the pores of solid material repel various substances, such as water ice. However, it remains unclear whether retain their icephobic characteristics under impact supercooled droplets or repeated freezing melting cycles....
Slippery, liquid-infused porous surfaces offer a promising route for producing omniphobic and anti-icing surfaces. Typically, these are made as coating with expensive time consuming assembly methods or fluorinated films oils. We report on surfaces, which utilizes liquid precursor fed oxygen-hydrogen flame to produce titania nanoparticles deposited directly low-density polyethylene film. This nanocoating, thickness of several hundreds nanometers, is then filled silicone oil. The produced...
At present flexible electronic devices are under extensive development and, among them, organic light-emitting diode displays the closest to a large market deployment. One of remaining unsolved challenges is high throughput production impermeable transparent barrier layers that protect sensitive materials against ambient moisture. The studies deal with adaptation atomic layer deposition (ALD) process high-throughput roll-to-roll using spatial ALD concept. We report such for 20 nm thickness...
Nanostructured coatings have been prepared on a flexible, moving paperboard using deposition of ca. 40-nm-sized titanium dioxide nanoparticles generated by liquid flame spray process, directly above the paperboard, to achieve improved functional properties for material. Properties such as surface wettability can be extensively thin layer substrate. Owing vulnerability heat, substrate needs moved rapidly through flame. This, other hand, generates setting roll-to-roll coating which favors...
Titanium dioxide films were grown by atomic layer deposition (ALD) using titanium tetraisopropoxide as a precursor and water, ozone, or oxygen plasma coreactants. Low temperatures (80–120 °C) used to grow moisture barrier TiO2 on polyethylene naphthalate. The maximum growth per cycle for processes 0.33, 0.12, 0.56 Å/cycle, respectively. X-ray photoelectron spectrometry was evaluate the chemical composition of layers origin carbon contamination studied deconvoluting C1s peaks. In...
The chemical composition of a TiO2 nanoparticle coated paper surface was analyzed using time-of-flight secondary ion mass spectrometry (ToF-SIMS) to study the interconnection between wettability and chemistry on nanoscale. In this work, superhydrophobic rich in carboxyl-terminated molecules created by liquid flame spray process. can be converted photocatalytic oxidation into highly hydrophilic one. Interestingly, back heat treatment. results showed that both ultraviolet A (UVA) oven...
The potential of using potato fruit juice (PFJ), a byproduct from the starch industry, was investigated as barrier paper-coating material. paperboard initially hand-coated with PFJ (with and without glycerol plasticizer) then extrusion-coated poly(lactic acid) (PLA) or blend PLA poly(butylene adipate terephthalate) (PBAT). multilayer coated homogeneous in appearance glossy finish. showed, at most, ca. 95% reduction specific water vapor transmission rate compared to uncoated paperboard. In...
Polymer and paper structures have been successfully utilized in several fields, especially the packaging industry. Together with barrier properties, printability is an important property applications. From point of view printing, dense impervious structure extrusion coatings challenging. Flame, corona atmospheric plasma treatments were used to modify surface low density polyethylene (LDPE) polypropylene (PP) influence these modifications on print quality, i.e., toner adhesion visual quality...
Abstract The moisture barrier and heat sealability properties of polylactide (PLA) extrusion‐coated paperboard were investigated. first part the study focused on influences coating weight surroundings temperature relative humidity water vapour transmission rate (WVTR) structure. outcome arising from this was a simple practical equation that allows calculating WVTR as function PLA under specific thermo‐hygrometric conditions. second investigated effect treatments between 100 150°C 20 g/m 2...