Searched for: subject%3A%22Synthesis%255C%2B%255C%2528chemical%255C%2529%22
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van Groenestijn, G.J.A. (author), Meulendiiks, N.M.M. (author), Volker, A.W.F. (author), van Neer, P.L.M.J. (author), Buskens, P.J.P. (author)
Nanoparticles are applied in an increasing number of products (e.g. medicine, food and cosmetics). There is a need to real-time monitor the growth of nanoparticles during production inside the chemical reactor. However, standard particle sizing methods such as dynamic light scattering (DLS) and transmission electron microscopy (TEM) cannot do...
conference paper 2018
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Fonseca, A.S. (author), Kuijpers, E. (author), Kling, K.I. (author), Levin, M. (author), Koivisto, A.J. (author), Nielsen, S.H. (author), Fransman, W. (author), Fedutik, Y. (author), Jensen, K.A. (author), Koponen, I.K. (author)
Fume hoods are one of the most common types of equipment applied to reduce the potential of particle exposure in laboratory environments. A number of previous studies have shown particle release during work with nanomaterials under fume hoods. Here, we assessed laboratory workers’ inhalation exposure during synthesis and handling of CuO, TiO2...
article 2018
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Radacsi, N. (author), van der Heijden, A.E.D.M. (author), Stankiewicz, A.I. (author), ter Horst, J.H. (author)
In this study, atmospheric pressure cold plasma (surface dielectric barrier discharge) was used as an alternative energy form to intensify solution crystallization and produce nano-sized organic crystals. Nano-sized particles can have beneficial product properties such as improved internal quality and dissolution rate, compared to conventionally...
article 2013
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Meesters, R.J.W. (author), van Eijk, H.M.H. (author), ten Have, G.A.M. (author), de Graaf, A.A. (author), Venema, K. (author), van Rossum, B.E.J. (author), Deutz, N.E.P. (author), TNO Kwaliteit van Leven (author)
A new method involving zinc sulphate deproteinization was developed to study short chain fatty acids (SCFA) production in the colon and subsequent occurrence of SCFA in blood. SCFA were baseline separated in a 30 min cycle using ion-exclusion chromatography and detected by mass spectrometry. Concentrations could be measured down to 10 μM and...
article 2007
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TNO Defensie en Veiligheid (author), Marino, E. (author), Huijser, T. (author), Creyghton, Y.L.M. (author), van der Heijden, A.E.D.M. (author)
Metals and metal oxides are well-known catalysts in many applications. TNO investigates metal and metal oxide nanoparticles as catalysts in rocket and gun propellants. Using nanosize particles allows to tune the curing, mechanical or ballistic properties of the propellant, but to avoid undesired chemical side-reactions a coating of these...
conference paper 2007
document
TNO Kwaliteit van Leven (author), Barends, T.R.M. (author), Bultema, J.B. (author), Kaper, T. (author), van der Maarel, M.J.E.C. (author), Dijkhuizen, L. (author), Dijkstra, B.W. (author)
Amylomaltases are glycosyl hydrolases belonging to glycoside hydrolase family 77 that are capable of the synthesis of large cyclic glucans and the disproportionation of oligosaccharides. Using protein crystallography, we have generated a flip book movie of the amylomaltase catalytic cycle in atomic detail. The structures include a covalent...
article 2007
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TNO Kwaliteit van Leven (author), Sivan, S.S. (author), Tsitron, E. (author), Wachtel, E. (author), Roughley, P.J. (author), Sakkee, N. (author), van der Ham, F. (author), Groot, J.de (author), Roberts, S. (author), Maroudas, A. (author)
We have used the racemization of aspartic acid as a marker for the "molecular age" of aggrecan components of the human intervertebral disc matrix (aggregating and non-aggregating proteoglycans as well as the different buoyant density fractions of aggrecan). By measuring the D/L Asp ratio of the various aggrecan species as a function of age and...
article 2006
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TNO Industrie en Techniek (author), van Breemen, A.J.J.M. (author), Herwig, P.T. (author), Chlon, C.H.T. (author), Sweelssen, J. (author), Schoo, H.F.M. (author), Setayesh, S. (author), Hardeman, W.M. (author), Martin, C.A. (author), de Leeuw, D.M. (author), Valeton, J.J.P. (author), Bastiaansen, C.W.M. (author), Broer, D.J. (author), Popa-Merticaru, A.R. (author), Meskers, S.C.J. (author)
Butyl, hexyl, and decyl derivatives of the liquid-crystalline organic semiconductor 5,5″-bis(5-alkyl-2-thienylethynyl)-2,2′:5′, 2″-terthiophene were synthesized and studied with respect to their structural, optical, and electrical properties. By means of an optimized thermal annealing scheme the hexyl and decyl compounds could be processed into...
article 2006
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Kralj, S. (author), van Geel-Schutten, G.H. (author), Faber, E.J. (author), van der Maarel, M.J.E.C. (author), Dijkhuizen, L. (author), TNO Kwaliteit van Leven (author)
Glucansucrase or glucosyltransferase (GTF) enzymes of lactic acid bacteria display high sequence similarity but catalyze synthesis of different α-glucans (e.g., dextran, mutan, alternan, and reuteran) from sucrose. The variations in glucosidic linkage specificity observed in products of different glucansucrase enzymes appear to be based on...
article 2005
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Schaafsma, G. (author), TNO Kwaliteit van Leven (author)
Protein Digestibility-Corrected Amino Score (PDCAAS) is discussed. PDCAAS is now widely used as a routine assay for protein quality evaluation, replacing the more traditional biological methods [e.g., measurement of the Protein Efficiency Ratio (PER) in rats]. PDCAAS is based on comparison of the essential amino acid content of a test protein...
article 2005
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de Visser, P.C. (author), Govaerts, C. (author), van Hooft, P.A.V. (author), Overkleeft, H.S. (author), van Schepdael, A. (author), Hoogmartens, J. (author)
In the course of the synthesis and purification of new polymyxins and analogues, formation of a by-product with identical mass was observed and it was believed that this might be the result of acyl migration from the Nα- to the Nγ-position of residue α,γ-diaminobutyric acid 1 (Dab1) under acidic conditions. Therefore, a LC-MS/MS study was...
article 2004
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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
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Kralj, S. (author), Geel van - Schutten, G.H. (author), van der Maarel, M.J.E.C. (author), Dijkhuizen, L. (author)
Limited information is available about homopolysaccharide synthesis in the genus Lactobacillus. Using efficient screening techniques, extracellular glucosyltransferase (GTF) enzyme activity, resulting in α-glucan synthesis from sucrose, was detected in various lactobacilli. PCR with degenerate primers based on homologous boxes of known...
article 2003
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Bosker, W.T.E. (author), Ágoston, K. (author), Cohen Stuart, M.A. (author), Norde, W. (author), Timmermans, J.W. (author), Slaghek, T.M. (author)
Linear block copolymers of polystyrene and polysaccharide were synthesized using a block synthesis method with amino-terminated polystyrene and sodium cyanoborohydride as reducing agent. Different types of polysaccharides, dextrans, and maltodextrins with various molecular weights were used. IR spectroscopy indicated a successful coupling....
article 2003
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Heeres, A. (author), Spoelma, F.F. (author), van Doren, H.A. (author), Gotlieb, K.F. (author), Bleeker, I.P. (author), Kellogg, R.M. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)
Several 2-nitroalkyl polysaccharide ethers (from pullulan (1), guar (2), agarose (3), inulin (4), cellulose (5), Na-α-polyglucuronate (6) and hydroxyethyl cellulose (7)) were synthesized by reaction with 2-nitro-1-alkenes (2-nitro-1-propene and 2-nitro-1-butene) formed in situ from 2-nitroalkyl acetates. Moderate to high efficiencies are...
article 2000
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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
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Pestman, J.M. (author), Kevelam, J. (author), Blandamer, M.J. (author), van Doren, H.A. (author), Kellogg, R.M. (author), Engberts, J.B.F.N. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)
Eight homologous series of nonionic carbohydrate-derived surfactants in which the alkyl chains are linked through N-acylated amine bonds were synthesized, and their critical micelle concentrations (cmc's) and standard enthalpies of micellization were determined using titration microcalorimetry. Gibbs energies of micellization (ΔmicG°) were...
article 1999
document
van de Leur, R.H.M. (author), van der Waal, A. (author), TNO Industrie (author)
The vapours of organic solvents like toluene, butanon, and ethanol do effect the electrical conductivity of electrochemically synthesised polypyrrole. This property allows the use of polypyrrole in sensors for vapour detection. The conductivity is also a function of temperature and the history of the sensor. When exposed to water vapour, the...
article 1999
document
Kudyba-Jansen, A. (author), Almeida, M. (author), Laven, J. (author), van der Heijde, J.C.T. (author), Hintzen, H.T. (author), Metselaar, R. (author), TNO Industrie (author)
Properties of carbothermally prepared Ca-α-SiAlON and β-SiAlON powders and aqueous suspensions thereof were determined. The isoelectric points of Ca-α-SiAlON and β-SiAlON were 3·4 and 4·6. After addition of deflocculant, Dolapix CE64, the behaviour of both suspensions is nearly identical. The isoelectric points become 5·5 and 5·3, respectively....
article 1999
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