- document
-
Boersma, A. (author), Soloukhin, V.A. (author), Brokken-Zijp, J.C.M. (author), de With, G. (author), TNO Industrie (author)Load and depth sensing indentation has been used to characterize the elastic modulus and hardness of various polycarbonate films. This analytical technique is shown to be extremely suitable for the determination of gradients in these mechanical properties. Furthermore, it is demonstrated that such a gradient exists over a length of micrometers...article 2004
- document
-
Sengupta, S. (author), Toh, S.A. (author), Sellers, L.A. (author), Skepper, J.N. (author), Koolwijk, P. (author), Leung, H.W. (author), Yeung, H.W. (author), Wong, R.N.S. (author), Sasisekharan, R. (author), Fan, T.P.D. (author)Background-Ginseng is a commonly used nutraceutical. Intriguingly, existing literature reports both wound-healing and antitumor effects of ginseng extract through opposing activities on the vascular system. To elucidate this perplexity, we merged a chemical fingerprinting approach with a deconstructional study of the effects of pure molecules...article 2004
- document
-
Bos, B. (author), Gorter, H. (author), Dortmans, L.J.M.G. (author), Technisch Physische Dienst TNO - TH (author)In recent years, there has been much interest in the manufacturing of piezoceramic actuators by Solid Freeform Fabrication (SFF) methods, following developments in polymer and metal shaping. With these methods, actuator shapes can be realized that are impossible or very difficult to obtain by traditional ceramic shaping techniques. At TNO,...article 2004
- document
-
Technisch Physische Dienst TNO - TH (author), Haagh, G.A.A.V. (author), Peters, G.W.M. (author), van de Vosse, F.N. (author), Meijer, H.E.H. (author)Although gas-assisted injection molding (GAIM) has been practiced in industry for more than a decade, the process is not completely understood, particularly with respect to the gas penetration mechanism. Consequently, mold design and process control are often governed by trial-and-error, and reliable information on the gas distribution and the...article 2004
- document
-
van Woudenbergh, T. (author), Wildeman, J. (author), Blom, P.W.M. (author), Bastiaansen, J.J.A.M. (author), Langeveld-Voss, B.M.W. (author), TNO Industrie (author)It has recently been reported that, after electrical conditioning, an ohmic hole contact is formed in poly(9,9-dioctylfluorene) (PFO)-based polymer light-emitting diodes (PLED), despite the large hole-injection barrier obtained with a poly(styrene sulfonic acid)-doped poly(3,4-ethylenedioxythiophene) (PEDOTPSS) anode. We demonstrate that the...article 2004
- document
-
TNO Industrie (author), Meulenkamp, E.A. (author), van Aar, R. (author), Bastiaansen, J.J.A.M. (author), van den Biggelaar, A.J.M. (author), Börner, H. (author), Brunner, K. (author), Büchel, M. (author), van Dijken, A. (author), Kiggen, N.M.M. (author), Kilitziraki, M. (author), de Kok, M.M. (author), Langeveld, B.M.W. (author), Ligter, M.P.H. (author), Vulto, S.I.E. (author), van de Weijer, P. (author), de Winter, S.H.P.M. (author)We present results and a discussion of highly efficient polymer Light-Emitting Diodes (polymer LEDs, PLEDs). The external quantum efficiency in current standard devices reaches up to 2-4% only. We have explored two routes to enhance this value. In the first route, PEDOT/PSS is replaced with a novel anode or hole injection layer. The efficiency...conference paper 2004
- document
-
Pasveer, W.F. (author), Bobbert, P.A. (author), Michels, M.A.J. (author), Langeveld-Voss, B.M.W. (author), Schoo, H.F.M. (author), Bastiaansen, J.J.A.M. (author), TNO Industrie (author)Polymers with a small amount of dye blended in offer an attractive possibility to change the color of the emitted light by changing the dye. We present ab initio calculations within density-functional theory of the HOMO/ LUMO energies for dipyrrolomethane dyes, polyphenylenevinylene and polyfluorene. Special attention is paid to the trends in...article 2003
- document
-
Kok, S.J. (author), Wold, C.A. (author), Hankemeier, Th. (author), Schoenmakers, P.J. (author)Two commercial liquid chromatography-Fourier-transform infrared spectroscopy interfaces (LC-FTIR), viz. a flow cell and a solvent-elimination interface have been assessed for use in size-exclusion chromatography (SEC) with respect to their chromatographic integrity (i.e. peak asymmetry, chromatographic resolution), quantitative and qualitative...article 2003
- document
-
Dortmans, L.J.M.G. (author), Fischer, H.R. (author), Nelissen, R. (author), Technisch Physische Dienst TNO - TH (author)The lifetime of porous polymer moulds used for pressure casting of sanitaryware has been analysed, modelled and improved. The mechanical behaviour of the existing porous PMMA mould material was analysed using mechanical tests to assess the lifetime under cyclic loading. The relevant stress levels were obtained through in-situ strain gauge...article 2002
- document
-
TNO Industrie en Techniek (author), van Breemen, A.J.J.M. (author), Bastiaansen, J.J.A.M. (author), Langeveld, B.M.W. (author), Sweelssen, J. (author), van Haare, J.A.E.H. (author), Herwig, P.T. (author), Hoekerd, K.T. (author), Schoo, H.F.M. (author)Dye-doped semiconducting polymers are used as active layers in polymer light-emitting diodes (polyLEDs). The emission color can be tuned by doping the active polymer with certain dyes. This concept of energy transfer is demonstrated for a green matrix doped with a red-emitting dye, suitable for use in LEDs. An absolute PL efficiency of 39% is...article 2002
- document
-
TNO Industrie en Techniek (author), Fischer, H. (author)The surface of a bulk polystyrene has been scanned using a AFM equipped with a thermal probe at different temperatures. Scanning at room temperature reveals a real picture of the surface roughness, while scanning 40 and 20 K below the glass transition of the bulk PS results in a very flat smooth surface. Scans at the Tg show a deformation...article 2002
- document
-
Gerritsen, M. (author), Jansen, J.A. (author), Kros, A. (author), Vriezema, D.M. (author), Sommerdijk, N.A.J.M. (author), Nolte, R.J.M. (author), Lutterman, J.A. (author), van Hövell, S.W.F.M. (author), van der Gaag, A. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)The objective of this investigation was to evaluate the influence of polymorphonuclear granulocytes on the performance of uncoated and cellulose acetate/Nafion® coated amperometric glucose sensors in vitro. The response of these sensors was also investigated in serum. Uncoated and coated sensors showed lower sensitivities to glucose, with a...article 2001
- document
-
Mayer, P. (author), Vaes, W.H.J. (author), Wijnker, F. (author), Legierse, K.C.H.M. (author), Kraaij, R.H. (author), Tolls, J. (author), Hermens, J.L.M. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)Polymer coated glass fibers were applied as disposable samplers to measure dissolved concentrations of persistent and bioaccumulative pollutants (PBPs) in sediment porewater. The method is called matrix solid-phase microextraction (matrix-SPME), because it utilizes the entire sediment matrix as a reservoir for an equilibrium extraction: A glass...article 2000
- document
-
TNO Industrie en Techniek (author), Schoo, H.F.M. (author), van Breemen, A.J.J.M. (author), Langeveld-Voss, B.M.W. (author), Haare. J.A.E.H. van, (author), Herwig, P. (author)Organic semiconducting materials are now being investigated as active materials in light emitting diodes, photovoltaic cells, plastic electronics, etc. Important issues concerning the materials common to all areas, are processability, purity, reproducibility, stability and control over morphology. Big improvement in device fabrication, initial...article 2000
- document
-
de Klerk, W.P.C. (author), Schrader, M.A. (author), van der Steen, A.C. (author), TNO Prins Maurits Laboratory, Researchgroup Properties E., P.O. Box 45, 2280 AA Rijswijk, Netherlands (author)Compatibility is an important safety aspect related to the production and storage of energetic materials. To test different combinations of materials a simple test method with clear criteria is advisable. At the last ESTAC the use of microcalorimetry and the vacuum stability test for the compatibility testing of propellants were presented. This...article 1999
- document
-
Pijnenburg, K.G.W. (author), Steenbrink, A.C. (author), Giessen, E.V.D. (author), TNO Wegtransportmiddelen (author)Microstructural investigations below the fracture surface have revealed that the rubber particles in a number of polymer-rubber blends were deformed into remarkable S-like shapes. These shapes seem to have been largely ignored in previous microstructural studies of blends, but in fact cannot be explained from the known deformation states around...article 1999
- document
- Fischer, H.R. (author), TNO Industrie (author) article 1998
- document
-
Svanholm, T. (author), Molenaar, F. (author), Toussaint, A. (author), TNO Industrie (author)The interaction between an associative thickeners in solution and an anionic surfactant has been studied with rheology and surface tension measurements. Both a HEUR thickener and low molecular weight HMHEC thickener interacted strongly with the surfactant. The addition of surfactant leads in both cases to a reinforced transient network at low...article 1997
- document
-
Prins Maurits Laboratorium TNO (author), Bouma, R.H.B. (author), Nauta, W.J. (author), Arnauts, J.E.F. (author), van den Boomgaard, T. (author), Steuten, J.M. (author), Strathmann, H. (author)In the production of polyethylene foams by extrusion with alkanes as a blowing agent, significant changes in the dimensions of extruded products are encountered. The dimensional stability of a foam with a structure of closed cells is improved by blending the polymer with small amounts of a low molecular weight additive. It is believed that the...article 1997
- document
-
Stigter, E.C.A. (author), de Jong, G.A.H. (author), Jongejan, J.A. (author), Duine, J.A. (author), van der Lugt, J.P. (author), Somers, W.A.C. (author), TNO Voeding (author)A quinohemoprotein alcohol dehydrogenase (QH-EDH) from Comamonas testosteroni was immobilized on an electrode in a redox polymer network consisting of a polyvinylpyridine partially N-complexed with osmiumbis-(bipyridine)chloride. The enzyme effectively transfers electrons to the electrode via the polymer. An average maximum catalytic current of...article 1996