FS-CXS

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2019-12-12
16:13
OpenAccess [PUBDB-2019-05133] Journal Article
et al
X-rays induced atomic dynamics in a lithium-borate glass
The continuous development of synchrotron-based experimental techniques in the X-ray range provides new possibilities to probe the structure and the dynamics of bulk materials down to inter-atomic distances. However, the interaction of intense X-ray beams with matter can also induce changes in the structure and dynamics of materials [...]
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2019-12-09
16:23
OpenAccess [PUBDB-2019-04870] Book/Report/Dissertation / PhD Thesis

Structure and Dynamics of Complex Liquids - The Phase Behaviour of Silica-PNIPAm Nanogels
[DESY-THESIS-2019-032]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 101 pp. () [10.3204/PUBDB-2019-04870] = Dissertation, Universität Hamburg, 2019  GO
In this thesis, the structure and dynamics of highly concentrated core-shell nanogel particlescomposed of a silica core and a poly(N-isoproylacrylamide) (PNIPAm) shell suspendedin water are studied. The particles were synthesised with dierent core-to-shell size ratiosand prepared at various concentrations with volume fractions e between approximately0:004 and 2. [...]
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2019-11-25
12:56
[PUBDB-2019-04449] Journal Article
et al
The Phase Diagram of Colloidal Silica-PNIPAm core-shell Nanogels
Soft matter 16(2), 466-475 () [10.1039/C9SM01884K]  GO
We study the structure and dynamics of aqueous dispersions of densely packed core–shell nanoparticles composed of a silica core and a poly(N-isoproylacrylamide) (PNIPAm) shell as a function of temperature and concentration. With small angle X-ray scattering (SAXS) and X-ray photon correlation spectroscopy (XPCS) we shed light on the structural and dynamical changes of the thermo-responsive colloidal nanogel during its volume phase transition at a lower critical solution temperature (LCST) of 32 °C. [...]
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2019-11-25
12:52
[PUBDB-2019-04448] Journal Article
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Supercrystal Formation of Gold Nanorods by High Pressure Stimulation
We demonstrate the pressure-induced formation of supercrystalsmade from PEGylated gold nanorods (NRs) in aqueous suspension.Utilizing the combined effect of hydrostatic pressure and salt on the solubilityof the organic poly(ethylene glycol) (PEG) shell that passivates the NRs, thereversible formation of two-dimensional hexagonal supercrystals has beenobserved by means of small-angle X-ray scattering. The pressure dependenceof the crystal lattice’s structural parameters is determined. [...]
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2019-11-04
11:01
OpenAccess [PUBDB-2019-03870] Contribution to a conference proceedings
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Ultrafast Magnetisation Dynamics at the Low-Fluence Limit Supported by External Magnetic Fields
39th International Free-Electron Laser Conference, HamburgHamburg, Germany, 26 Aug 2019 - 30 Aug 20192019-08-262019-08-30 574 - 577 () [10.18429/JACoW-FEL2019-THA04] special issue: "FEL19 Proceedings" (978-3-95450-210-3)  GO
We report on ultrafast magnetisation dynamics in ferromagnetic cobalt/platinum multilayers upon pumping by near and mid to far infrared radiation, utilizing sub-100 femtosecond free-electron laser pulses. The evolution of the excited magnetic state is studied on femtosecond timescales with nanometre spatial resolution and element selectivity, employing time-resolved magnetic small-angle X-ray scattering. [...]
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2019-10-08
04:05
Embargoed OpenAccess [PUBDB-2019-03612] Journal Article
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Kinetics of pressure-induced nanocrystal superlattice formation
Colloidal nanocrystals (NC) are known to self-organize into superlattices that promise many applications ranging from medicine to optoelectronics. Recently, the formation of high-quality PEGylated gold NC was reported at high hydrostatic pressure and high salt concentrations. [...]
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2019-10-07
11:21
Embargoed OpenAccess [PUBDB-2019-03600] Journal Article
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Coexistence of hcp and bct Phases during In Situ Superlattice Assembly from Faceted Colloidal Nanocrystals
We study the in situ self-assembly of faceted PbS nanocrystals from colloidal suspensions upon controlled solvent evaporation using time-resolved small-angle X-ray scattering and X-ray cross-correlation analysis. In our bulk-sensitive experiment in transmission geometry, the superlattice crystallization is observed in real time, revealing a hexagonal closed-packed (hcp) structure followed by formation of a body-centered cubic (bcc) superlattice. [...]
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2019-10-01
16:19
OpenAccess [PUBDB-2019-03551] Book/Report/Dissertation / PhD Thesis

Development of a compact hard X-ray split-and-delay line for studying ultrafast dynamics at free electron laser sources
[DESY-THESIS-2019-023]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 140 pp. () [10.3204/PUBDB-2019-03551] = Dissertation, Universität Hamburg, 2019  GO
The study of condensed matter dynamics on ultrafast timescales is one of the key topics in modern material science research. Hard X-ray free-electron laser sources with extreme peak brightness and ultra short pulses provide excellent conditions for studying ultrafast dynamics in the time domain by employing such techniques as X-ray pump-probe spectroscopy or X-ray photon correlation spectroscopy. [...]
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2019-10-01
13:12
OpenAccess [PUBDB-2019-03548] Journal Article
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Impact of Symmetry on Anisotropic Magnetoresistance in Textured Ferromagnetic Thin Films
Physical review letters 123(13), 137201-1-137201-7 () [10.1103/PhysRevLett.123.137201]  GO
We report on the magnetoresistance of textured films consisting of 3d-ferromagnetic layers sandwiched by Pt. While the conventional cos2φ behavior of the anisotropic magnetoresistance (AMR) is found when the magnetization M is varied in the film plane, cos2nθ contributions (2n≤6) exist for rotating M in the plane perpendicular to the current. [...]
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2019-08-29
16:44
[PUBDB-2019-03151] Conference Presentation
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Ultrafast Demagnetization by Extreme Ultraviolet Light
Joint Magnetism and Magnetic Materials-INTERMAG Conference 2019, Washington, D.C.Washington, D.C., USA, 13 Jan 2019 - 18 Jan 20192019-01-132019-01-18

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