Light Scattering and Absorption Complementarities to Neutron Scattering: In Situ FTIR and DLS Techniques at the High-Intensity and Extended Q-Range SANS Diffractometer KWS-2

被引:5
作者
Balacescu, Livia [1 ,2 ]
Brandl, Georg [2 ]
Kaneko, Fumitoshi [3 ]
Schrader, Tobias Erich [2 ]
Radulescu, Aurel [2 ]
机构
[1] Rheinisch Westfal Tech Hsch RWTH, Phys Inst IA, Otto Blumenthal Str, D-52074 Aachen, Germany
[2] Forschungszentrum Julich, Julich Ctr Neutron Sci JCNS, Heinz Maier Leibnitz Zentrum MLZ, D-85747 Garching, Germany
[3] Osaka Univ, Grad Sch Sci, 1-1 Machikaneyama, Toyonaka, Osaka 5600043, Japan
来源
APPLIED SCIENCES-BASEL | 2021年 / 11卷 / 11期
关键词
SANS; FTIR; DLS; semi-crystalline polymers; proteins in buffer solution; GUEST-EXCHANGE PROCESSES; X-RAY-SCATTERING; POLY(ETHYLENE OXIDE); HELICAL CONFORMATION; NORMAL VIBRATIONS; CO-CRYSTALS; POLYMER; CRYSTALLIZATION; COMBINATION;
D O I
10.3390/app11115135
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Understanding soft and biological materials requires global knowledge of their microstructural features from elementary units at the nm scale up to larger complex aggregates in the micrometer range. Such a wide range of scale can be explored using the KWS-2 small-angle neutron (SANS) diffractometer. Additional information obtained by in situ complementary techniques sometimes supports the SANS analysis of systems undergoing structural modifications under external stimuli or which are stable only for short times. Observations at the local molecular level structure and conformation assists with an unambiguous interpretation of the SANS data using appropriate structural models, while monitoring of the sample condition during the SANS investigation ensures the sample stability and desired composition and chemical conditions. Thus, we equipped the KWS-2 with complementary light absorption and scattering capabilities: Fourier transform infrared (FTIR) spectroscopy can now be performed simultaneously with standard and time-resolved SANS, while in situ dynamic light scattering (DLS) became available for routine experiments, which enables the observation of either changes in the sample composition, due to sedimentation effects, or in size of morphologies, due to aggregation processes. The performance of each setup is demonstrated here using systems representative of those typically investigated on this beamline and benchmarked to studies performed offline.
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页数:17
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