J. Laven

article

Investigation of a Guillain-Barré syndrome cluster in the Republic of Fiji

Daniel M. Pastula, Aalisha Sahu Khan, Tyler M. Sharp, Viema L. Biaukula, more

Journal of the Neurological Sciences > 2017 > 372 > C > 350-355

In 2014, we investigated a cluster of Guillain-Barre syndrome (GBS) in Fiji that occurred during a dengue epidemic. We designed a case-control study to determine the etiology.Cases were patients meeting Brighton Collaboration criteria for GBS with onset from February 2014 to May 2014. Controls were persons without symptoms of GBS who were matched by age group and location. We collected information...

article

Light converter coatings from cross-linked PDMS/particles composite materials

A.C.C. Esteves, J. Brokken-Zijp, J. Laven, G. de With

Progress in Organic Coatings > 2010 > 68 > 1-2 > 12-18

Cross-linked composite PDMS coatings containing luminescent micrometer-sized Ce doped Y ₃ Al ₅ O ₁₂ garnet particles were prepared. The garnet particles were homogeneously and individually dispersed across the bulk of the cross-linked composite coatings, which is an important requirement for the potential application of these polymer-based light converter coatings.The thermal...

article

Garnet particles effect on the cross-linking of PDMS and the network structures formed

A.C.C. Esteves, J. Brokken-Zijp, J. Lavèn, H.P. Huinink, more

Polymer > 2010 > 51 > 1 > 136-145

Poly(dimethylsiloxane) (PDMS) cross-linked films with different concentrations of micrometer-sized garnet particles were prepared through hydrosilylation reaction between a di-vinyl-terminated PDMS and a four-functional silane cross-linker in the presence of a Platinum catalyst. The garnet particles, consisting of micrometer-sized Ce doped Y ₃ Al ₅ O ₁₂ particles commonly used...

article

Influence of cross-linker concentration on the cross-linking of PDMS and the network structures formed

A.C.C. Esteves, J. Brokken-Zijp, J. Laven, H.P. Huinink, more

Polymer > 2009 > 50 > 16 > 3955-3966

The cross-linking of linear di-vinyl-terminated poly(dimethylsiloxanes) (PDMS) with tetrakis(dimethylsiloxane) was studied in the presence of different concentrations of the cross-linker (H/V=ratio of Si–H groups of the cross-linker and CC bonds). The consumption of the Si–H and CC bonds was monitored simultaneously by in situ Confocal Raman Microscopy (CRM) and ATR-FTIR spectroscopy. When formulations...

article

Functional CD1d and/or NKT cell invariant chain transcript in horse, pig, African elephant and guinea pig, but not in ruminants

Frank A. Looringh van Beeck, Peter Reinink, Roel Hermsen, Dirk M. Zajonc, more

Molecular Immunology > 2009 > 46 > 7 > 1424-1431

CD1d-restricted invariant natural killer T cells (NKT cells) have been well characterized in humans and mice, but it is unknown whether they are present in other species. Here we describe the invariant TCR α chain and the full length CD1d transcript of pig and horse. Molecular modeling predicts that porcine (po) invariant TCR α chain/poCD1d/α-GalCer and equine (eq) invariant TCR α chain/eqCD1d/α-GalCer...

article

The influence of the pigment volume concentration on the curing of alkyd coatings: A 1D MRI depth profiling study

S.J.F. Erich, H.P. Huinink, O.C.G. Adan, J. Laven, more

Progress in Organic Coatings > 2008 > 63 > 4 > 399-404

The level of pigmentation varies in different types of alkyd coatings. Obviously, the properties of a coating are influenced by the pigment volume concentration (PVC). Especially, around the so-called critical pigment volume concentration (CPVC) the properties change dramatically, since the coating structure changes considerably around this point. Although it is known that the permeability changes...

article

Adsorption of ethoxylated styrene oxide and polyacrylic acid and mixtures there of on organic pigment

W.K. Wijting, J. Laven, R.A.T.M. van Benthem, G. de With

Journal of Colloid And Interface Science > 2008 > 327 > 1 > 1-8

The adsorption of two polymeric surfactants on an organic pigment was investigated. As surfactants the anionic polyacrylic acid sodium salt (PANa, MW=15,000) and a non-ionic block copolymer surfactant based on styrene oxide (SO) and ethylene oxide (EO) (MW=1500) were used. The adsorption behavior was analyzed by size exclusion chromatography of the supernatant after centrifugation of the pigment dispersions...

article

A comparison of concentration methods applied to non-infectious flavivirus recombinant antigens for use in diagnostic serological assays

Brandy J. Russell, Jason O. Velez, Janeen J. Laven, Alison J. Johnson, more

Journal of Virological Methods > 2007 > 145 > 1 > 62-70

Since the introduction of West Nile virus into the United States in 1999, there has been a greater awareness of arboviruses, consequently, diagnostic testing for West Nile virus and other arboviruses has increased both in U.S. and international public health laboratories. The Centers for Disease Control and Prevention/Division of Vector-Borne Infectious Diseases/Arbovirus Diagnostic and Reference...

article

Plate–sphere hybrid dispersions: Heterocoagulation kinetics and DLVO evaluation

D.J. Voorn, W. Ming, J. Laven, J. Meuldijk, more

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2007 > 294 > 1-3 > 236-246

We have studied the formation of colloidal composite particles through the controlled heterocoagulation of anionically charged polystyrene (PS) and poly(isobutyl methacrylate) (PiBMA) latex spheres with positively charged gibbsite platelets. The latex particles, synthesized by emulsion polymerization, varied in size and surface charge density. The heterocoagulation was studied as a function of the...

article

Influence of catalyst type on the curing process and network structure of alkyd coatings

S.J.F. Erich, J. Laven, L. Pel, H.P. Huinink, more

Polymer > 2006 > 47 > 4 > 1141-1149

Recent studies have shown that cobalt catalysts, used for curing of alkyd coatings, are potentially carcinogenic, and hence replacement by new environmental friendly catalysts is needed. The influence of different metal based catalysts on the oxidation process has been studied extensively in model systems, consisting of unsaturated oils. However, these results may not be representative for real coatings,...

article

NMR depth profiling of drying alkyd coatings with different catalysts

S.J. F. Erich, J. Laven, L. Pel, H.P. Huinink, more

Progress in Organic Coatings > 2006 > 55 > 2 > 105-111

Cobalt based catalyst are widely used for curing of alkyd resins. The concern on the carcinogenicity of cobalt based catalyst is steadily growing. Therefore, possible alternative catalyst systems are investigated, e.g. based on Mn or Fe. Knowledge of the influence of these catalysts on the spatial and temporal evolution of the solidification of a coating is required to understand the mechanisms involved...

article

Thermally cured low surface-tension epoxy films

R.D. van de Grampel, W. Ming, W.J.H. van Gennip, F. van der Velden, more

Polymer > 2005 > 46 > 23 > 10531- 10537

A simple method is described on the preparation of low surface-tension epoxy films via thermal curing. First a partially fluorinated diamine was synthesized by reacting perfluoroalkyl epoxide with a known excess of diamine. Then a mixture of the fluorinated diamine and diglycidyl ether of bisphenol-A was thermally cured, resulting in films with surface tensions as low as 15mN/m by using less than...

article

Comparison of NMR and confocal Raman microscopy as coatings research tools

S.J. F. Erich, J. Laven, L. Pel, H.P. Huinink, more

Progress in Organic Coatings > 2005 > 52 > 3 > 210-216

Recently, several new experimental techniques have been developed to measure the spatial and temporal evolution of a drying coating film. One of these techniques is nuclear magnetic resonance (NMR) using a very high magnetic field gradient. An advantage of this technique is the ability to image a nontransparent coating film perpendicular to its surface with a resolution better than 10 μ m (depth profiling)...

article

The Outermost Atomic Layer of Thin Films of Fluorinated Polymethacrylates

R. D. van de Grampel, W. Ming, A. Gildenpfennig, W. J. H. van Gennip, more

Langmuir > 2004 > 20 > 15 > 6344 - 6351

article

Quantification of Fluorine Density in the Outermost Atomic Layer

R. D. van de Grampel, W. Ming, A. Gildenpfennig, J. Laven, more

Langmuir > 2004 > 20 > 1 > 145 - 149

article

Full scale electrokinetic dewatering of waste sludge

M.H.M. Raats, A.J.G. van Diemen, J. Lavèn, H.N. Stein

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2002 > 210 > 2-3 > 231 - 241

Increasing volumes of waste sludge, an intense environmental awareness and stringent legislation impose increasing demands upon conventional sludge dewatering equipment. In this study, the electrokinetic dewatering of waste slurries is studied. Full-scale electrokinetic facilities were developed that were based on a combination of a gravity-driven thickening belt and a belt press. The method was tested...

article

Surface studies of partially fluorinated polymethacrylates: a combined XPS and LEIS analysis

R.D. van de Grampel, W. Ming, A. Gildenpfennig, W.J.H. van Gennip, more

Progress in Organic Coatings > 2002 > 45 > 2-3 > 273-279

Thin films of copolymers of 1,1-dihydroperfluoroheptyl methacrylate (FHMA) and methyl methacrylate (MMA) were investigated with respect to both their molecular and macroscopic surface properties. Introduction of FHMA entities in copolymer decreases the surface energy to a large extent. Angle resolved X-ray photoelectron spectroscopy (XPS) measurements show an increased average fluorine concentration...

article

A Self-Consistent-Field Analysis of the Surface Structure and Surface Tension of Partially Fluorinated Copolymers: The Influence of Polymer Architecture

R. D. van de Grampel, W. Ming, J. Laven, R. van der Linde, more

Macromolecules > 2002 > 35 > 14 > 5670 - 5680

article

Use of poly(2-vinylpyridine)-b-poly(ɛ-caprolactone) copolymers as pigment stabilizers in powder coatings

F. L. Duivenvoorde, K. Jansen, J. Laven, R. Linde

Journal of Coatings Technology > 2002 > 74 > 931 > 49-57

Four poly(2-vinylpyridine)-b-poly(ɛ-caprolactone) copolymers, differing in buoy block length and anchor/buoy block length ratio, have been used as TiO₂ pigment dispersants in a polyester powder coating resin. When the TiO₂ surface was fully covered with the block copolymers, the colloidal stability of the TiO₂ dispersions at typical curing temperatures was significantly improved because of the formation...

article

On the Validity of the Foam Drainage Equation

H.N. Stein, J. Laven

Journal of Colloid And Interface Science > 2001 > 244 > 2 > 436-438

INFONA - science communication portal

Search results for: J. Laven

Investigation of a Guillain-Barré syndrome cluster in the Republic of Fiji

Light converter coatings from cross-linked PDMS/particles composite materials

Garnet particles effect on the cross-linking of PDMS and the network structures formed

Influence of cross-linker concentration on the cross-linking of PDMS and the network structures formed

Functional CD1d and/or NKT cell invariant chain transcript in horse, pig, African elephant and guinea pig, but not in ruminants

The influence of the pigment volume concentration on the curing of alkyd coatings: A 1D MRI depth profiling study

Adsorption of ethoxylated styrene oxide and polyacrylic acid and mixtures there of on organic pigment

A comparison of concentration methods applied to non-infectious flavivirus recombinant antigens for use in diagnostic serological assays

Plate–sphere hybrid dispersions: Heterocoagulation kinetics and DLVO evaluation

Influence of catalyst type on the curing process and network structure of alkyd coatings

NMR depth profiling of drying alkyd coatings with different catalysts

Thermally cured low surface-tension epoxy films

Comparison of NMR and confocal Raman microscopy as coatings research tools

The Outermost Atomic Layer of Thin Films of Fluorinated Polymethacrylates

Quantification of Fluorine Density in the Outermost Atomic Layer

Full scale electrokinetic dewatering of waste sludge

Surface studies of partially fluorinated polymethacrylates: a combined XPS and LEIS analysis

A Self-Consistent-Field Analysis of the Surface Structure and Surface Tension of Partially Fluorinated Copolymers: The Influence of Polymer Architecture

Use of poly(2-vinylpyridine)-b-poly(ɛ-caprolactone) copolymers as pigment stabilizers in powder coatings

On the Validity of the Foam Drainage Equation

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