Searched for: author%3A%22Bouwman%2C+W.G.%22
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Pauw, Brian R. (author), Smales, Glen J. (author), Anker, Andy S. (author), Annadurai, Venkatasamy (author), Balazs, Daniel M. (author), Bienert, Ralf (author), Bouwman, W.G. (author), Bressler, Ingo (author), Breternitz, Joachim (author)
A round-robin study has been carried out to estimate the impact of the human element in small-angle scattering data analysis. Four corrected datasets were provided to participants ready for analysis. All datasets were measured on samples containing spherical scatterers, with two datasets in dilute dispersions and two from powders. Most of the...
journal article 2023
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Iashina, E.G. (author), Bouwman, W.G. (author), Duif, C.P. (author), Dalgliesh, Robert M. (author), Varfolomeeva, Elena Y. (author), Pantina, Rimma A. (author), Kovalev, Roman A. (author), Fedorova, Natalia D. (author), Grigoriev, S. V. (author)
The organization of chromatin in the nuclei of rat lymphocyte was studied by time-of-flight spin-echo small-angle neutron scattering (ToF-SESANS). The procedures of the measurements in ToF and monochromatic SESANS modes were compared. It is shown that the sensitivity of the ToF method is significantly higher than that of the monochromatic mode....
journal article 2023
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Parnell, S.R. (author), Berg, Sergi Van Den (author), Bolderink, G. (author), Bouwman, W.G. (author)
The spin-echo small-angle neutron scattering (SESANS) technique utilises a series of inclined magnetic fields before and after the sample to encode the scattering angle into the polarisation to obtain a much higher resolution than in conventional SANS. The analogous technique (spin echo modulated SANS (SEMSANS)) implements spin manipulations...
journal article 2023
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Kadletz, E. (author), Bouwman, W.G. (author), Pappas, C. (author)
A novel spin echo small-angle neutron scattering (SESANS) concept based on a rotationally symmetric magnetic field geometry is introduced. The proposed method is similar to the conventional linear SESANS technique but uses<br/>longitudinal precession fields and field gradients in a radial direction, as typically found in neutron spin echo (NSE)...
journal article 2022
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Bouwman, W.G. (author)
Spin-echo small-angle neutron scattering (SESANS) yields structural information on length scales from 30 nanometres up till 20 micrometres. These length scales match nicely those of colloids, protein networks and fat droplets, which are present in many food materials. This makes SESANS an excellent probe to study food materials. An interesting...
journal article 2021
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Smith, Gregory N. (author), Brok, Erik (author), Schmiele, Martin (author), Mortensen, Kell (author), Bouwman, W.G. (author), Duif, C.P. (author), Hassenkam, Tue (author), Alm, Martin (author), Thomsen, Peter (author), Arleth, Lise (author)
By introducing hydrophilic polymers into silicone medical devices, highly beneficial biomedical properties can be realized. An established solution to introduce hydrophilic polymers is to form an interpenetrating polymer network (IPN) by performing the hydrogel synthesis in the presence of silicone swollen in supercritical carbon dioxide. The...
journal article 2021
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Serial, M. R. (author), Velichko, E. (author), Nikolaeva, T. (author), den Adel, R. (author), Terenzi, C. (author), Bouwman, W.G. (author), van Duynhoven, J. P.M. (author)
Functionalized biomass waste sources of cellulose have drawn attention due to their high availability and sustainability properties. In this work we characterize the structural and flow properties of high-pressure homogenized citrus fiber cellulose dispersions, employing SAXS, rheology and rheo-MRI techniques. The high-pressure treatment...
journal article 2021
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Tian, B. (author), Heringa, J.R. (author), Bouwman, W.G. (author)
Small angle scattering is frequently applied to study the anisotropy in complex soft matter systems. One emerging application is to probe the multi-scale structure in food matrices; while few models are available to describe the anisotropic scattering pattern in a quantitative, yet simple manner. For this purpose, anisotropy is introduced to...
journal article 2021
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Bouwman, W.G. (author), Knudsen, Erik B. (author), Udby, Linda (author), Willendrup, Peter (author)
For the further development of spin-echo techniques to label elastic scattering it is necessary to perform simulations of the Larmor precession of neutron spins in a magnetic field. The details of some of these techniques as implemented at the reactor in Delft are simulated. First, the workings of the magnetized foil flipper are simulated. A...
journal article 2021
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Biswas, Priyanka (author), Sen, Debasis (author), Bouwman, W.G. (author)
Spray-drying is a widely used industrial technique and has shown an immense potential in the fields of nanoscience and technology. This is due to its ability to synthesize microgranules consisting of correlated nanostructures using evaporation induced assembly through bottom-up approach. Although the nature of correlation among the...
journal article 2021
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Bakker, J.H. (author), Washington, Adam L. (author), Parnell, S.R. (author), van Well, A.A. (author), Pappas, C. (author), Bouwman, W.G. (author)
SESANS data analysis has been implemented in the SasView software package, allowing SESANS experiments to be analyzed using a numerical Hankel transformation of isotropic small-angle scattering (SAS) models. The error of the numerical approximation is three orders of magnitude below typical experimental errors. All advanced data fitting...
journal article 2020
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Tian, B. (author), Wang, Zhaojun (author), de Campo, Liliana (author), Gilbert, Elliot P. (author), Dalgliesh, Robert M. (author), Velichko, E. (author), van der Goot, Atze Jan (author), Bouwman, W.G. (author)
Pronounced fibres are formed through simple shearing of a dense calcium caseinate dispersion. Both mechanical tests and scanning electron microscopy images demonstrate that the material is anisotropic. It is hypothesised that calcium caseinate aggregates, under shear, align into micro-fibres and bundle further into a hierarchical structure....
journal article 2020
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Schmitt, Julien (author), Zeeuw, Jan Joost (author), Zeeuw, Jan Joost (author), Plomp, J. (author), Bouwman, W.G. (author), Washington, Adam L. (author), Duif, C.P. (author), Thijs, M.A. (author), Parnell, S.R. (author)
The initial formation stages of surfactant-templated silica thin films which grow at the air-water interface were studied using combined spin-echo modulated small-angle neutron scattering (SEMSANS) and small-angle neutron scattering (SANS). The films are formed from either a cationic surfactant or nonionic surfactant (C16EO8) in a dilute...
journal article 2020
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Nikolaeva, Tatiana (author), Rietkerk, Tim (author), Sein, Arjen (author), Dalgliesh, Robert (author), Bouwman, W.G. (author), Velichko, E. (author), Tian, B. (author), Van As, Henk (author), van Duynhoven, John (author)
Phospholipid gum mesostructures formed in crude soybean oil after water degumming (WD) and enzymatic degumming (ED) were studied at a range of phospholipid and water concentrations. For ED, phospholipase C (PLC), phospholipase A2 (PLA2) and a mixture of phospholipases Purifine 3G (3G) were used. Both WD and ED resulted in lamellar liquid...
journal article 2020
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Mulder, Maarten (author), Li, Xuesong X. (author), Nazim, M.M. (author), Dalgliesh, Robert M. (author), Tian, B. (author), Buijse, Marten (author), van Wunnik, John (author), Bouwman, W.G. (author)
Microemulsion systems consisting of D<sub>2</sub>O, an alkane, an anionic internal olefin sulfonate surfactant, salt and secondary butyl alcohol (SBA) as co-solvent are studied in a systematic way. In four different sample sets, either the salt content, SBA content or alkane carbon number was varied in order to study the effects of the...
journal article 2019
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Velichko, E. (author), Tian, B. (author), Nikolaeva, Tatiana (author), Koning, J.R.A. (author), van Duynhoven, John (author), Bouwman, W.G. (author)
A versatile cell for X-ray and neutron scattering experiments on samples under shear has been designed. To our knowledge, it is the first shear cell which can be used for both SAXS and SANS in respectively synchrotron or reactor beamlines. The cell is mainly intended for scattering experiments in so-called “1–2 plane geometry” but can also be...
journal article 2019
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Geerits, N. (author), Parnell, S.R. (author), Thijs, M.A. (author), Bouwman, W.G. (author), Plomp, J. (author)
A time of flight MIEZE spectrometerstudyis presented. The instrumentuses solenoid radio frequency(RF)spin flipperswithsquare pole shoes and a magnetic yoke. These flippers can achieve higherstaticfields than conventional resonant RF spin flippers, which employ an air core.High fields are crucial for the construction of a high resolution and...
journal article 2019
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Gaspar, Hugo (author), Santos, Raquel (author), Teixeira, Paulo (author), Hilliou, Loic (author), Weir, Michael P. (author), Duif, C.P. (author), Bouwman, W.G. (author), Parnell, S.R. (author), King, Stephen M. (author)
We investigate the morphological development of polystyrene (PS)-C <sub>60</sub> nanocomposites along the length of a prototype co-rotating twin-screw extruder with sampling capabilities. The effects of C <sub>60</sub> concentration and output on the morphological evolution along the extruder are studied employing a suite of characterization...
journal article 2019
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Tian, B. (author), Garcia Sakai, Victoria (author), Pappas, C. (author), van der Goot, Atze Jan (author), Bouwman, W.G. (author)
We present an investigation of the dynamics of calcium caseinate as a function of hydration, solvent isotope (H<sub>2</sub>O and D<sub>2</sub>O) and drying methods (roller drying and spray drying), using quasi-elastic neutron scattering (QENS). These factors are key to the formation of fibres in this material which makes it a potential...
journal article 2019
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Iashina, Ekaterina G. (author), Filatov, Mikhail V. (author), Pantina, Rimma A. (author), Varfolomeeva, Elena Y. (author), Bouwman, W.G. (author), Duif, C.P. (author), Honecker, Dirk (author), Pipich, Vitaliy (author), Grigoriev, Sergey V. (author)
This paper reports on the two-scale fractal structure of chromatin organization in the nucleus of the HeLa cell. Two neutron scattering methods, small-angle neutron scattering (SANS) and spin-echo SANS, are used to unambiguously identify the large-scale structure as being a logarithmic fractal with the correlation function (r) - ln(r/E). The...
journal article 2019
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