2D-MWPC for the new reflectometer REFSANS/FRM-II: performance of the prototype

Kampmann, R.; Marmotti, M.; Haese, Martin; Kudryashov, V. A.

doi:10.1016/j.nima.2004.05.009

Cited by 20 publications

(10 citation statements)

References 4 publications

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“…Neutron reflectivity measurements were performed at the REFSANS instrument at the Heinz-Maier-Leibnitz Zentrum (MLZ) in Garching, Germany. − A wavelength band from 3 to 21 Å (resolution Δλ/λ = 10%) was used. Static measurements were conducted at two fixed incident angles of α i = 0.6° and α i = 2.4° for 20 and 100 min, respectively, to enlarge the q z range.…”

Section: Methodsmentioning

confidence: 99%

“…ToF-GISANS measurements were carried out at the REFSANS instrument at the Heinz-Maier-Leibnitz Zentrum (MLZ) in Garching, Germany. − A neutron beam with a wavelength range of 3–21 Å was used, and the scattered signal was recorded as a function of the time of flight. To increase the intensity, a setup was chosen with five neutron beams on the sample, which were focused on the detector.…”

Section: Methodsmentioning

confidence: 99%

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Phase Transition Kinetics of Doubly Thermoresponsive Poly(sulfobetaine)-Based Diblock Copolymer Thin Films

et al. 2020

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The swelling and phase transition behavior upon increasing temperature of a doubly thermoresponsive diblock copolymer thin film in steps above the characteristic cloud points (CPs) of the blocks is studied. An upper critical solution temperature (UCST)-type zwitterionic poly-(sulfobetaine), poly(N,N-dimethyl-N-(3-methacrylamidopropyl)-ammoniopropane sulfonate) (PSPP, CP UCST = 31.5 °C), is combined with a lower critical solution temperature (LCST)-type nonionic poly(N-isopropyl-/ methacrylamide) (PNIPMAM, CP LCST = 49.5 °C) block. Using time-offlight neutron reflectivity (ToF-NR), we observe the swelling in D 2 O vapor at a constant temperature of 20 °C, followed by two subsequent temperature jumps, from 20 to 40 °C (above CP UCST ) and from 40 to 60 °C (above CP LCST ). The observed response of the diblock copolymer films deviates from the aqueous solution behavior, which is mainly attributed to the increased polymer concentration. Temperature-induced changes in the thin-film nanostructure are investigated with ToF grazing-incidence small-angle neutron scattering (GISANS). Alterations in the chain conformation and hydrogen bonding are probed by Fourier transform infrared (FTIR) spectroscopy. The ionic SO 3 − groups (in the PSPP block) and the nonionic hydrophilic amide groups (in both blocks) are found to affect the mechanisms of D 2 O uptake and release significantly.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Phase Transition Kinetics of Doubly Thermoresponsive Poly(sulfobetaine)-Based Diblock Copolymer Thin Films

et al. 2020

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“…The wavelength resolution of the incident beam is controlled using a double high-speed chopper system. The separation distance between the choppers was about 2.31 m and the system was operated as described by Kampmann et al (2002Kampmann et al ( , 2003Kampmann et al ( , 2004Kampmann et al ( , 2006. The slits on both choppers can be varied between 0 and 120 .…”

Section: Time-of-flight Gisansmentioning

confidence: 99%

Structural investigation of thin diblock copolymer films using time-of-flight grazing-incidence small-angle neutron scattering

Metwalli

Moulin²,

Rauscher

et al. 2010

J Appl Cryst

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The depth‐dependent morphology of the microphase separation structure in thin block copolymer films is examined using non‐destructive time‐of‐flight grazing‐incidence small‐angle neutron scattering. The structure of a cylinder‐forming diblock copolymer, polystyrene(deuterated)‐block‐polyisoprene, in contact with either a low‐ or a high‐energy substrate surface is investigated. A systematic identification of the components of the polymer film at different depths is achieved by utilizing the material characteristic Yoneda peak. For the polymer film attached to the low‐surface‐energy aminosilane‐coated substrate, a morphology transition from lamellar at the substrate–polymer interface, via perforated lamellar in the film bulk, to an ill‐defined structure at the polymer–air interface is observed. This phase transition along the film normal is due to the competition between the surface‐induced morphological changes and the stable cylindrical bulk morphology of the diblock copolymer. In contrast, on the high‐energy surface no pronounced ordering is found for the applied conditions.

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“…REFSANS was operated in a collimation configuration using five low-divergence beams (1 mrad) converging on the detector, to increase the neutron flux at the sample position . The scattered intensity was recorded on a two-dimensional 3 He multiwire proportional detector (Kampmann, Marmotti et al, 2004). The data were recorded in list mode, meaning that all detection events were recorded as a function of time with a time resolution of 2 ns and stored for offline analysis (Kampmann et al, 2006).…”

Section: Grazing-incidence Small-angle Neutron Scatteringmentioning

confidence: 99%

Morphology determination of defect-rich diblock copolymer films with time-of-flight grazing-incidence small-angle neutron scattering

et al. 2014

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The complex nanomorphology of a defect‐rich deuterated poly(styrene‐block‐methyl methacrylate), P(S‐b‐MMAd), diblock copolymer film is determined with a combination of grazing‐incidence small‐angle neutron scattering (GISANS) and time‐of‐flight (TOF) mode. TOF‐GISANS enables the simultaneous performance of several GISANS measurements that differ in wavelength. The resulting set of GISANS data covers different ranges of the scattering vector and has different scattering depths. Thus surface‐sensitive and bulk‐sensitive measurements can be performed simultaneously. The P(S‐b‐MMAd) film exhibits a lamellar microphase separation structure, which because of the defects is arranged into small, randomly oriented grains, composed of four–five lamellar repetitions. In the near‐surface region, the lamellar structure is oriented parallel to the substrate, which explains the smooth surface found with atomic force microscopy.

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2D-MWPC for the new reflectometer REFSANS/FRM-II: performance of the prototype

Cited by 20 publications

References 4 publications

Phase Transition Kinetics of Doubly Thermoresponsive Poly(sulfobetaine)-Based Diblock Copolymer Thin Films

Phase Transition Kinetics of Doubly Thermoresponsive Poly(sulfobetaine)-Based Diblock Copolymer Thin Films

Structural investigation of thin diblock copolymer films using time-of-flight grazing-incidence small-angle neutron scattering

Morphology determination of defect-rich diblock copolymer films with time-of-flight grazing-incidence small-angle neutron scattering

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