Barend Van Lagen - Academia.edu (original) (raw)
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Papers by Barend Van Lagen
Advanced Materials Interfaces, 2021
Surface‐initiated photoinduced electron‐transfer‐reversible addition–fragmentation chain transfer... more Surface‐initiated photoinduced electron‐transfer‐reversible addition–fragmentation chain transfer (SI‐PET‐RAFT) is, for the first time, used for the creation of antifouling polymer brushes on gold surfaces based on three monomers: oligo(ethylene glycol) methyl ether methacrylate (MeOEGMA), N‐(2‐hydroxypropyl) methacrylamide (HPMA), and carboxybetaine methacrylamide (CBMA). These coatings are subsequently characterized by X‐ray photoelectron spectroscopy (XPS) and ellipsometry. The living nature of this polymerization allows for the creation of random and diblock copolymer brushes, which are based on HPMA (superb antifouling) and CBMA (good antifouling and functionalizable via activated ester chemistry). The polymer brushes demonstrate good antifouling properties against undiluted human serum, as monitored by quartz crystal microbalance with dissipation (QCM‐D) and surface plasmon resonance (SPR) spectroscopy in real time. The amount of immobilization of bioactive moieties, here an a...
Fresen Environ Bull, 2001
Geoderma, 1997
We compared the quantitative responses of liquid-state (LS) and solid-state (CPMAS) 13C-NMR spect... more We compared the quantitative responses of liquid-state (LS) and solid-state (CPMAS) 13C-NMR spectroscopy of four different soil humic substances. The intensities of signals for the alkyl carbons (0–40 ppm) were significantly larger in CPMAS than in LS spectra. This difference is in agreement with the pseudo-micellar model of the conformational nature of humic substances. By this view, the hydrophobic interactions
![Research paper thumbnail of Stereochemical Inversion of Rim-Differentiated Pillar[5]arene Molecular Swings](https://attachments.academia-assets.com/78441769/thumbnails/1.jpg)
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Revista Brasileira de Ciência do Solo
We hypothesised that, during occlusion inside granular aggregates of oxide-rich soils, the light ... more We hypothesised that, during occlusion inside granular aggregates of oxide-rich soils, the light fraction organic matter would undergo a strong process of decomposition, either due to the slow process of aggregate formation and stabilisation or due to digestion in the macro- and meso-fauna guts. This process would favour the accumulation of recalcitrant materials inside aggregates. The aim of this study was to compare the dynamics and the chemical composition of free and occluded light fraction organic matter in a natural cerrado vegetation (woodland savannah) and a nearby pasture (Brachiaria spp.) to elucidate the transformations during occlusion of light fraction in aggregates of a clayey Oxisol. Nuclear Magnetic Resonance of the 13C, with Cross Polarisation and Magic Angle Spinning (13C-CPMAS-NMR), and 13C/12C isotopic ratio were combined to study organic matter composition and changes in carbon dynamics, respectively. The occluded light fraction had a slower turnover than the fr...
Synfacts, Sep 1, 2007
© Georg Thieme Verlag Stuttgart · New York. Fluorescence Quenching Naphthalene Diimide Multimers ... more © Georg Thieme Verlag Stuttgart · New York. Fluorescence Quenching Naphthalene Diimide Multimers with Siloxane Cores. Contributor(s): Timothy M. Swager, Ryan M. Moslin. P.Ganesan, B. van Lagen, ATM Marcelis, EJR Sudhölter, H. Zuilhof*. ...
Advanced Materials Interfaces, 2015
Tetrahedron Letters, 2008
A new and divergent synthetic route to oligodiacetylene (ODA) building blocks has been developed ... more A new and divergent synthetic route to oligodiacetylene (ODA) building blocks has been developed via Sonogashira reactions under a reductive atmosphere. These central building blocks provide a new way for rapid preparation of long ODAs. In addition, we report on their optoelectronic properties which are dependent on their end cap. Finally, the formation of their radical cations, and their optical
Organic Geochemistry, 2002
Organic & Biomolecular Chemistry, 2011
Advanced Materials Interfaces, 2021
Surface‐initiated photoinduced electron‐transfer‐reversible addition–fragmentation chain transfer... more Surface‐initiated photoinduced electron‐transfer‐reversible addition–fragmentation chain transfer (SI‐PET‐RAFT) is, for the first time, used for the creation of antifouling polymer brushes on gold surfaces based on three monomers: oligo(ethylene glycol) methyl ether methacrylate (MeOEGMA), N‐(2‐hydroxypropyl) methacrylamide (HPMA), and carboxybetaine methacrylamide (CBMA). These coatings are subsequently characterized by X‐ray photoelectron spectroscopy (XPS) and ellipsometry. The living nature of this polymerization allows for the creation of random and diblock copolymer brushes, which are based on HPMA (superb antifouling) and CBMA (good antifouling and functionalizable via activated ester chemistry). The polymer brushes demonstrate good antifouling properties against undiluted human serum, as monitored by quartz crystal microbalance with dissipation (QCM‐D) and surface plasmon resonance (SPR) spectroscopy in real time. The amount of immobilization of bioactive moieties, here an a...
Fresen Environ Bull, 2001
Geoderma, 1997
We compared the quantitative responses of liquid-state (LS) and solid-state (CPMAS) 13C-NMR spect... more We compared the quantitative responses of liquid-state (LS) and solid-state (CPMAS) 13C-NMR spectroscopy of four different soil humic substances. The intensities of signals for the alkyl carbons (0–40 ppm) were significantly larger in CPMAS than in LS spectra. This difference is in agreement with the pseudo-micellar model of the conformational nature of humic substances. By this view, the hydrophobic interactions
Revista Brasileira de Ciência do Solo
We hypothesised that, during occlusion inside granular aggregates of oxide-rich soils, the light ... more We hypothesised that, during occlusion inside granular aggregates of oxide-rich soils, the light fraction organic matter would undergo a strong process of decomposition, either due to the slow process of aggregate formation and stabilisation or due to digestion in the macro- and meso-fauna guts. This process would favour the accumulation of recalcitrant materials inside aggregates. The aim of this study was to compare the dynamics and the chemical composition of free and occluded light fraction organic matter in a natural cerrado vegetation (woodland savannah) and a nearby pasture (Brachiaria spp.) to elucidate the transformations during occlusion of light fraction in aggregates of a clayey Oxisol. Nuclear Magnetic Resonance of the 13C, with Cross Polarisation and Magic Angle Spinning (13C-CPMAS-NMR), and 13C/12C isotopic ratio were combined to study organic matter composition and changes in carbon dynamics, respectively. The occluded light fraction had a slower turnover than the fr...
Synfacts, Sep 1, 2007
© Georg Thieme Verlag Stuttgart · New York. Fluorescence Quenching Naphthalene Diimide Multimers ... more © Georg Thieme Verlag Stuttgart · New York. Fluorescence Quenching Naphthalene Diimide Multimers with Siloxane Cores. Contributor(s): Timothy M. Swager, Ryan M. Moslin. P.Ganesan, B. van Lagen, ATM Marcelis, EJR Sudhölter, H. Zuilhof*. ...
Advanced Materials Interfaces, 2015
Tetrahedron Letters, 2008
A new and divergent synthetic route to oligodiacetylene (ODA) building blocks has been developed ... more A new and divergent synthetic route to oligodiacetylene (ODA) building blocks has been developed via Sonogashira reactions under a reductive atmosphere. These central building blocks provide a new way for rapid preparation of long ODAs. In addition, we report on their optoelectronic properties which are dependent on their end cap. Finally, the formation of their radical cations, and their optical
Organic Geochemistry, 2002
Organic & Biomolecular Chemistry, 2011