Jonas Ortegren

Mid Sweden University · Department of Applied Science and Design

Recently, much research has investigated nanocomposites and their properties for the development of energy storage systems. Supercapacitor performance is usually enhanced by the use of porous electrode structures, which produce a larger surface area for reaction. In this work, a biocompatible polymer of starch medium was used to create the porous n...

Inks and toners used for printing contain materials, such as polyester, with strong triboelectric properties to enhance the binding effects, making wastepaper, such as magazines and newspapers, good candidates for triboelectric materials. In this study, we report high‐output power triboelectric nanogenerators (TENGs) that utilize wastepaper as trib...

Considerable research has been devoted to the development of cathode materials for Al-ion batteries, but challenges remain regarding the behavior of aluminum anodes. Inert oxide (Al2O3) film on Al surfaces presents a barrier to electrochemical activity. The structure of the oxide film needs to be weakened to facilitate ion transfer during electroch...

Biometric signatures based on either the physiological or behavioural features of a person have been widely used for identification and authentication. However, few strategies have been developed that combine the two types of features in one signature. Here, we report a type of biometric signature based on the triboelectricity of the human body (TE...

Human-computer interaction (HCI) strategies communicate the human mind and machine intelligence based on different devices and technologies. The majority of HCI strategies assume normal physical conditions that limit accessibility for users with disabilities. Certain products, such as Braille keyboards, work fine for people with specific disabiliti...

Although ionic liquid electrolytes (ILs) are environmentally unfriendly, they are the most common electrolyte used in aluminum-ion batteries (AIB). Aqueous electrolytes offer a more sustainable alternative, but problem with oxide passivating barrier on Al surface becomes more profound. Recently, a new sub-class of aqueous electrolytes, water-in-sal...

Engineering polymers with quantified charge affinities are commonly used materials in triboelectric nanogenerators (TENGs). A polymer can have only one specific charge affinity due to its uniform chemical composition, leading to the need for two different materials to make an effective TENG. However, unlike engineering polymers, half-cell plant ski...

Material development is essential when studying triboelectric nanogenerators (TENGs). This importance is because the performance of TENGs are highly dependent on the properties of the utilized triboelectric materials. To obtain more specific properties, composites have been developed that combine the features of their components. According to Googl...

We report design and simulation results of a high-efficiency long-wavelength cutoff filter realized by stepped impedance resonators. Moreover, numerical results confirm by modulating the length of resonator, cutoff wavelength can be easily tuned.

This paper presents design and simulation results of a super-compact and efficient plasmonic cutoff filter based on an asymmetric E-shaped resonator. Moreover, by modulating length of the resonator, cutoff wavelength can be easily adjusted.

A miniaturized and efficient tunable wide flat-top band-pass filter at NIR is proposed in a MIM plasmonic waveguide. Furthermore, numerical results illustrate that tunability is readily attained by varying length of right-angle trapezoid resonator.

A highly efficient and compact wide flat-top band-pass filter at NIR is realized in a MIM plasmonic waveguide. Besides, simulation results reveal that through tuning the length of resonators, a broadband band-pass transmission can be easily achieved.

Triboelectrification can occur between any two materials with different charge affinities. This phenomenon represents the fundamental physics of triboelectric nanogenerators (TENGs). Organic materials such as polymers have been widely used in TENGs because of their dielectric properties. Inorganic materials are, however, not widely studied despite...

We report the design and numerical results of a miniaturized and efficient plasmonic cut-off filter that is based on stepped impedance resonators and operates at telecom wavelengths.

Triboelectrification (contact electrification) as a physical phenomenon appeared for the first time in a dialogue by Plato around 400 B.C. The phenomenon described in the dialogue is about amber that people wear attracting dry hair. The description also indicated that triboelectrification was first discovered on the human body. However, the studies...

Silicon anodes are considered as promising electrode materials for next-generation high capacity lithium-ion batteries (LIBs). However, the capacity fading due to the large volume changes (∼300%) of silicon particles during the charge–discharge cycles is still a bottleneck. The volume changes of silicon lead to a fracture of the silicon particles,...

Thermally expandable microspheres are extensively used in industry as a lightweight filler for many products. The spheres can expand up to 60 times the initial size and are used for different purposes, including material reduction and surface modification. In fused filament fabrication (FFF), a material is deposited in a layer-by-layer process. Typ...

This letter presents design and simulation results of a highly-efficient and compact plasmonic high-pass filter based on a MIM waveguide. Numerical results reveal that by tailoring structural parameters, desired cut-off wavelength can be chosen.

This letter describes design and numerical simulation of an extremely-compact and efficient high-pass plasmonic filter based on MIM waveguides. Numerical results shown that by tuning structural parameters, desired cut-off wavelengths can be chosen.

Triboelectric nanogenerators (TENGs) have attracted increasing attention because of their excellent energy conversion efficiency, the diverse choice of materials, and their broad applications in energy harvesting devices and self-powered sensors. New materials have been explored, including green materials, but their performances have not yet reache...

This paper reports design and simulation of a tunable highly-efficient reconfigurable plasmonic filter based on MIM waveguides. Simulation results shown that by adjusting structural parameters, the device can work as a multipurpose optical circuit.

This paper describes numerical results of an ultra-compact and efficient plasmonic cut-off filter based on a MIM waveguide. Simulation results confirm that by adjusting structural parameters, the desired spectral response can be easily obtained.

A multipurpose and ultra-compact nanoplasmonic wavelength filter based on stub structure in a metal-insulator-metal (MIM) waveguide is suggested and numerically investigated. A novel approach of connecting two stepped-like apertures to both input and output ports is applied to form Fabry-Perot (FP) cavities, which enabled the structure to act as a...

To increase the energy storage density of lithium-ion batteries, silicon anodes have been explored due to their high capacity. One of the main challenges for silicon anodes are large volume variations during the lithiation processes. Recently, several high-performance schemes have been demonstrated with increased life cycles utilizing nanomaterials...

The sensing of body motions is of great importance in areas such as healthcare, rehabilitation, and human-computer interactions. Different methods have been developed based on visual or electrical signals. However, such signals are acquired by external devices and are not intrinsic signals that are created on the body. Here, we report a new univers...

Triboelectric nanogenerators (TENG:s) are used as efficient energy transducers in energy harvesting converting mechanical energy into electrical energy. Wind is an abundant source of mechanical energy but how should a good triboelectric wind harvester be designed? We have built and studied a TENG driven by air flow in a table-top sized wind tunnel....

The use of triboelectric nanogenerators (TENGs) is a new technique for energy harvesting at both small and large scales. Almost all types of mechanical energy can be harvested with TENGs by using four modes of operation that cover almost all mechanical motions. The interactions of the human body with TENGs range from energy harvesting, motion sensi...

Metallic nanowire-based transparent electrodes (TEs) are potential alternatives to indium tin oxide (ITO). To achieve a high performance [sheet resistance (Rs) <100 Ω/sq, transmittance (T%) > 90%], the nanowires must have a high length-to-diameter (L/D) ratio to minimize the number of wire-to-wire junctions. Attempts to produce TEs with gold nanowi...

Human skin is a dielectric material that can be used as a triboelectric material for harvesting energy from body motions. The output power of such human skin-based triboelectric nanogenerator (TENG) is relatively low. Here, we assembled high-output human body-constituted TENGs (H-TENGs) by taking advantage of the unique electrical properties of the...

The triboelectric effect, charging by contact, is the working principle in a device called a triboelectric nanogenerator. They are used as efficient energy transducers in energy harvesting. In such generators the charging of surfaces at contact is followed by a separation of the surfaces increasing the electrical energy which can subsequently be us...

MoS2has been studied intensively during recent years as a semiconducting material in several fields, including optoelectronics, for applications such as solar cells and phototransistors. The photoresponse mechanisms of MoS2have been discussed but are not fully understood, especially the phenomenon in which the photocurrent slowly increases. Here, w...

Triboelectrification has been known and discussed since antiquity. Triboelectrification occurs in the human body due to friction between human skin and other materials such as clothing. However, charges on the body have not been harvested to power small electronics. Here, we report for the first time that the electricity generated on the human body...

The piezoelectricity of nanomaterials attracts a great deal of attention due to its broad application, including the harvesting of ambient mechanical energy to power small electronics devices. We report here a simple method to fabricate piezoelectric nanogenerators consisting of networks of ZnO nanosheets grown on aluminum (Al) foils, where the Al...

We previously reported on the effect of surface properties on inkjet print quality and print functionality. Printing can furthermore be used to effectively functionalize paper surfaces or to modify surface properties of paper for subsequent inkjet printing. Migration of molecules and particles from the paper surface may cause destabilization of the...

The resistance of inkjet printed lines using a silver nanoparticle based ink can be very dependent on the substrate. A very large difference in resistivity was observed for tracks printed on paper substrates with aluminum oxide based coatings compared to silica based coatings. Silica based coatings are often cationized with polymers using chloride...

The widespread usage of paper and board offer largely unexploited possibilities for printed electronics applications. Reliability and performance of printed devices on comparatively rough and inhomogenous surfaces of paper does however pose challenges.Silver nanoparticle ink has been deposited on ten various paper substrates by inkjet printing. The...

Different types of the commercial surface treatment InkAid have been evaluated as a surface treatment to enhance print quality of silver nano-particle ink structures printed on polyimide and polyethene substrates. Originally these coatings were designed to be applied on substrates for graphical ink jet printing. On the coated polyimide and polyethe...

The quality of a printed image is strongly influenced by the physical and the chemical interactions between the ink and the paper. Print quality can be evaluated either by objective measurements using instruments or by visual assessment studies involving panel of observers judging the final print. In this article, the print quality on commercial pa...

Digital printing using high-speed inkjet technology puts heavy demands on paper's ability to rapidly absorb the liquid. This is important for both the runability during the printing process and for the print quality. In this article, the dynamics of inkjet droplet absorption and penetration is discussed. The LucasWashburn equation has been applied...

We report second harmonic generation in a ferroelectric liquid crystalline trimer and ferroelectric liquid crystalline dendrimers of first, second and third generation. Thin cells were filled with the compounds by capillary forces at elevated temperature, and cooled from the surface stabilized ferroelectric state to below the glass transition tempe...

Silver nanoparticle inks are printed on nine papers as well as a polyimide film. Structure width and edge raggedness is evaluated on each substrate for both polar and non-polar ink. The substrates are characterized in terms of material content and various physical surface properties. The aim of this study is to establish relevant correlations betwe...

Inkjet printing is a non impact printing method that deposits a limited amount of ink onto the paper surface. To improve runnabillity and printability the demands on papers ability to rapidly absorb the fluid and make the colorants stay on the surface increase. These demands get more pronounced as the technology develops and the print speed signifi...

During the last few years, digital printing technology has begun to play a significant role in the printing industry due to the quest for short runs and variable data printing. Digital printing using inkjet technology makes heavy demands on the paper's ability to rapidly absorb liquid and thereby increases the need to understand what parameters tha...

In this paper a number of selective sintering methods suitable for inkjet printed nanoparticles are demonstrated on two different coated papers. The selective methods demonstrated here are electric current heating, microwave sintering and photonic curing. As a reference, conventional heat chamber sintering is also included. Conductivity measurement...

Cockling of paper is unwanted out-of-plane deformation arising from variations in humidity. Paper is typically characterised by measurements of dimensional changes when slowly changing the humidity or by measurements of cockling on printed paper after printing. Here, a novel experimental set-up is presented in which cockling can be measured on-line...

Characteristic changes in the organization of fibrillar collagen can potentially serve as an early diagnostic marker in various pathological processes. Tissue types containing collagen I can be probed by pulsed high-intensity laser radiation, thereby generating second harmonic light that provides information about the composition and structure at a...

Inkjet technology is becoming established as a production method and emerges as a printing technology for printing functionalities on various media. The development has encouraged intensified research in the fields of inkjet technology and paper media. The work presented here is part of a research program that attempts to bridge the gap between the...

We have incorporated the photochromic dyes spiropyran and spirooxazine in surfactant templated mesostructured silica particles. Spherical inorganic–organic hybrid pigments with varying dye content were produced by a one-pot synthesis in an aerosol reactor where the internal mesostructure could be controlled. The mesostructured inorganic–organic hyb...

The incorporation of photochromic dyes in mesostructured silica particles and the subsequent incorporation of the particles in latex to create solid films with relatively large, yet controllable, thickness, was recently reported [N. Andersson, P. C. A. Alberius, J. Skov Pedersen, L. Bergstroem, Microporous and Mesoporous Materials, 2004, 72, 175-18...

The dilatational properties of fluid surfaces and interfaces have been comprehensively investigated in recent years. For example, an improved oscillating bubble device provided experimental results that allow for critical testing of established surface models, such as the Lucassen/van den Tempel (LvdT) model. The comparison of the LvdT model with t...

In this paper we discuss selected equilibrium and dynamic properties of adsorption layers of soluble surfactants. The surface state has been investigated by nonlinear optical techniques based on second order chi(2) effects which exhibit a high surface specificity and suppress bulk contributions. The surface tension isotherm sigma(c )of the homologo...

An experiment for the investigation of the exchange dynamics of adsorbed and dissolved surfactants at the air-water interface is described. The experiment combines two established techniques: the method of the oscillating bubble generates in a well-defined fashion a nonequilibrium state by a periodic compression and expansion of the surface layer....

The surface dilatational properties of aqueous solutions of sodium dodecyl sulfate (SDS) and n-dodecanol are investigated in the frequency range 1≤f≤500 Hz using the oscillating bubble method. The results demonstrate that a pure dodecanol solution has an elastic surface without viscous effect whereas the surface of a SDS solution without added dode...

Liquid crystalline dendrimers with peripheral mesogen-containing units have been prepared. Multistep synthesis with several selective reactions was used in the preparation of the mesogen-containing molecules, 4‘ ‘-[10-(hydroxycarbonyl)decyloxy]phenyl 4-[4‘-(2-(R)-octyloxy)-3‘-nitrophenyl]benzoate and 4‘ ‘-[10-(hydroxycarbonyl)decyloxy]biphenyl 4-[4...

The dielectric relaxation was determined in a time-domain spectrometer between 100 and 295K and from 0.1 to 1000Hz for series of dendritic liquid crystalline polymers with scaffolds based on 2,2-bis(hydroxymethyl)propionic acid (bis-MPA) of generations 0–3 with 4″-((R)-1-methylheptyloxy)phenyl 4-{4′-[10-(hydroxy-carbonyl)decyloxy]-phenyl} benzoate...

Monofunctional ferroelectric liquid crystalline monomers and a blend of monofunctional/bifunctional ferroelectric liquid crystalline monomers were photopolymerized, yielding a side-chain liquid crystalline polymer and a cross-linked polymer, respectively. The cross-linked polymer exhibited higher thermal stability than the side-chain liquid crystal...

The preparation and characterization of a series of novel ferroelectric liquid crystalline dendrimers are presented. End-capping of 1-, 2-, and 3-generation dendrimers based on 2,2-bis(hydroxymethyl)propionic acid with mesogens gave surface-functionalized liquid crystalline compounds with 6, 12, and 24 mesogen-containing units, respectively. 4‘ ‘-(...

Highly oriented pyroelectric liquid-crystalline polymers were prepared by photopolymerization under the influence of a static electric field from binary mixtures of two acrylate monomers exhibiting chiral smectic C mesomorphism. Both monomers contained nitro groups to yield second order nonlinear optical properties (second harmonic generation) and...

M-line measurements have been performed on thin films of pyroelectric liquid crystalline polymers (PLCP), in order to determine the magnitude and anisotropy of the refractive index. The films, polymerized under various conditions, are based on materials exhibiting a chiral smectic C phase. The results of the measurements were analyzed and compared...

Pyroelectric Liquid Crystal Polymers (PLCP), a novel class of material with intrinsic polar order developed in our laboratory, are discussed. Thin films (2-4 μm) of PLCP were prepared by photopolymerization of ferroelectric liquid crystalline monomers in the chiral smectic C (SmC*) phase. The poly(acrylate) materials have been structurally modified...

Pyroelectric liquid-crystal polymers were prepared by photopolymerization of binary mixtures of two monomers that exhibit a smectic C* phase: A2c, 4″-{(R)-(−)-2-[(10-acryloyloxy)decyl]oxy}-3-nitrophenyl 4-{4′[(11-acryloyloxy)undecyloxy]phenyl}benzoate and A1b, 4″-((R)-(+)-2-octyloxy)-3″-nitro phenyl 4-(4′-[(11acryloyloxy)undecyloxy]phenyl) benzoate...

Second harmonic generation in novel pyroelectric liquid crystal polymers (PLCP) made from a series binary mixtures, was studied using 1100 nm as the fundamental wavelength. The PLCPs were prepared by photo-polymerization of binary mixtures of two monomers which exhibit a smectic C∗ phase, A2c (4″-(R)-(−)-2-[(10-acrylo-yloxy)decyl]oxy-3-nitrophenyl...

M-line measurements have been performed on thin films of pyroelectric liquid crystalline polymers (PLCP), in order to determine the magnitude and anisotropy of the refractive index. The films, polymerized under various conditions, are based on materials exhibiting a chiral smectic C phase. The results of the measurements were analyzed and compared...