Lehmo, Finland
Lehmo, Finland

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Ventola K.,University of Eastern Finland | Tervo J.,University of Eastern Finland | Siitonen S.,Nanocomp | Tuovinen H.,University of Eastern Finland | Kuittinen M.,University of Eastern Finland
Optics Express | Year: 2012

We demonstrate high-efficiency half-wave retardation in diffracted light in the 2nd order Littrow mounting. The diffracting structure is a slanted crossed grating with subwavelength period in the direction of the second grating vector, which makes it possible to mix the polarization states of the input light inside the grating layer, and hence to create the half-wave retardation. We present an experimental result with 58.9 % diffraction efficiency and a near perfect half-wave retardation. We explain the effect qualitatively using the classical coupled-wave approach. © 2012 Optical Society of America.


Schauer M.W.,Nanocomp | White M.A.,Nanocomp
Materials Research Society Symposium Proceedings | Year: 2015

The vast majority of industrial scale Carbon Nanotube (CNT) production involves short nanotubes (< 100 microns) that appear as a powder. These products are typically utilized as minor components (usually less than 2%) in polymers where they may or may not impart marginal improvements in composite properties. At Nanocomp Technologies we produce large-format CNT material by floating catalyst chemical vapor deposition. This technique produces very long CNTs (> 1 mm) in the gas phase, where entanglement produces large format material of exceptional strength and electrical conductivity. By manipulating the physics and chemistry of the process, the format and properties of the material can be controlled. Post-production processing further enhances the desired material properties. In this way applications such as Armor, Wiring and Cables for aerospace, and Integrated Energy Storage can be realized. © 2015 Materials Research Society.


Dorr J.,Nanocomp
Chemical Engineer | Year: 2010

The possibilities and challenges of scaling up carbon nanotube (CNT) technology are discussed. Carbon nanotubes are simply graphite structures that take on a lattice-like tubular format similar to chicken fence wire. CNTs are made using a variety of production methods that includes arc discharge, laser ablation and chemical vapor deposition (CVD). CNT sheet material allows for easy incorporation into many fixed-form and flexible structures as a lightweight shielding alternative. One of the most striking attributes of CNT material is its multi-functional properties, meaning the ability to be highly conductive while simultaneously exhibiting superior strength. CNT material shows great promise in overcoming challenges of providing a highly protective, yet lighter weight body armor. CNT material could also potentially be used in the development of thermo-electric devices and technology. Macro CNT structures, particularly those with long tube lengths that are bound tightly together are increasingly recognized by regulatory agencies as being distinctive products with less threat.


Oo S.Z.,University of Southampton | Chen R.Y.,University of Southampton | Siitonen S.,Nanocomp | Kontturi V.,Nanocomp | And 4 more authors.
Optics Express | Year: 2013

The 'KlariteTM' SERS sensor platform consisting of an array of gold coated inverted square pyramids patterned onto a silicon substrate has become the industry standard over the last decade, providing highly reproducible SERS signals. In this paper, we report successful transfer from silicon to plastic base platform of an optimized SERS substrate design which provides 8 times improvement in sensitivity for a Benzenethiol test molecule compared to standard production Klarite. Transfer is achieved using roll-to-roll and sheet-level nanoimprint fabrication techniques. The new generation plastic SERS sensors provide the added benefit of cheap low cost mass-manufacture, and easy disposal. The plastic replicated SERS sensors are shown to provide ~107 enhancement factor with good reproducibility (5%). © 2013 Optical Society of America.


Tang X.,Soochow University of China | Hong R.Y.,Soochow University of China | Hong R.Y.,Fuzhou University | Feng W.G.,Nanocomp | Badami D.,University of Waterloo
Journal of Alloys and Compounds | Year: 2013

Strontium hexaferrite (SrFe12O19) nanoparticles were prepared using ethylene glycol (EG) assisted hydrothermal synthesis. The experimental results revealed that the reaction temperature and the amount of EG had an effect on the size, morphology and magnetic properties of SrFe 12O19 nanoparticles. SrFe12O19 nanoparticles with a size of about 25 nm were obtained at 140 °C for 24 h at the EG/W volumetric ratios of 1/1. The saturation magnetization of the particles was approximately 10.6 emu/g. Furthermore, SrFe12O 19 nanoparticles modified by oleic acid could be dispersed in high boiling point mineral oil to form highly-concentrated magnetic fluid. The magnetic and rheological properties of magnetic fluid were investigated using a Gouy magnetic balance and a rotational rheometer, respectively. The magnetic fluid showed excellent stability in gravity field and external magnetic field, and exhibited shear-thinning behavior. Moreover, the magnetic fluid had obvious heating effect in an alternating magnetic field and had potential on hyperthermia therapy of tumor. © 2013 Elsevier B.V. All rights reserved.


Liu X.Y.,Soochow University of China | Hong R.Y.,Soochow University of China | Hong R.Y.,Fuzhou University | Feng W.G.,Nanocomp | Badami D.,University of Waterloo
Powder Technology | Year: 2014

Carbon nanoparticles (CNPs) with a controlled structure were synthesized through an attractive method based on the decomposition of methane in arc plasma processing. The effects of argon and methane flow rate, electrode material, and input electronic current on the morphology and CNPs' size were studied. The size and morphology of CNPs were characterized using scanning electron microscopy and transmission electron microscopy. Surface area and microstructure were characterized through BET surface area analysis, X-ray diffraction and Raman spectroscopy. The results showed that the BET surface area and resistivity of the CNPs were decreased with increasing input electronic current. © 2014 Elsevier B.V.


Luo Z.,Soochow University of China | Hong R.Y.,Soochow University of China | Hong R.Y.,Fuzhou University | Xie H.D.,Soochow University of China | And 2 more authors.
Powder Technology | Year: 2012

Functionally modified silica nanoparticles were synthesized by a one-step method, based on the hydrolysis of tetraethyl orthosilicate in aqueous alcohol solutions with the addition of 3-methacryloyloxypropyl trimethoxy silane. The effects of the surfactant, water and ammonia concentration, and reaction temperature on the morphology and particles' size of silica were studied. The particles' size and size distribution of silica were characterized using transmission electron microscopy, scanning electron microscopy and dynamic light scattering. Monodisperse, spherical, functional silica nanoparticles were obtained at the optimal conditions. Afterwards, silica nanoparticles were dispersed in polyurethane (PU) coatings via solution blending to reinforce PU. The thermal and mechanical properties of PU films were measured by thermogravimetric analysis and universal testing machine, respectively. The results showed that the thermal and mechanical properties of PU films were improved with the addition of the modified silica nanoparticles. © 2011.


A transmission type optical element (10) comprises a surface relief micro-grating (5, 9) for guiding light (13) propagating through the optical element. According to the present invention, at least a portion (5) of the thickness of the optical element (10) is formed of a colored material (4) so as to make the optical element colored.


Grant
Agency: Cordis | Branch: FP7 | Program: CP-IP | Phase: NMP-2010-4.0-2 | Award Amount: 6.85M | Year: 2011

The PHOTOSENS project aims to develop a low-cost, mass-manufacturable, nano-structured, large-area multi-parameter sensor array using Photonic Crystal (PC) and enhanced Surface Enhanced Raman Scattering (SERS) methodologies for environmental and pharmaceutical applications. Integrating the PC and SERS based sensors with integrated optics coupling structures within a single sensor platform allows the implementation of a high-performance multi-parameter sensor. Currently, utilization of multi-parameter sensing is hindered by the lack of low-cost and, highly reproducibility fabrication methods for nano-structured surfaces. PHOTOSENS addresses these challenges by developing new roll-to-roll nanoimprinting manufacturing methods. Scientific work includes development of the multilayer nanophotonic sensor structure, nanoimprint materials for large-area fabrication, functionalized molecularly imprinted polymers (MIP) and high-volume manufacturing methods including Roll-to-Roll (R2R) nanoimprint processes for nano-texturing of large-area plastic films. PHOTOSENS will greatly increase understanding of photonic and plasmonic dispersion and field localisation effects in periodic nanostructures, such as Photonic Crystals, and their applicability to sensing purposes. PHOTOSENS demonstrates a multi-parameter large-area sensor platform for environmental and pharmaceutical sensing. The consortium is composed of 4 world-class research organisations, 2 SMEs and 3 large companies from 6 European countries representing the complete supply chain from technology developers to end users. The position of these organizations in their respective markets guarantees that the results of the project will be widely exploited providing the companies with a technological advantage over their global competitors and thus creating new high-tech jobs in Europe in this rapidly growing market.


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