FS-CXS

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2018-05-15
11:13
OpenAccess [PUBDB-2018-01959] Journal Article
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Coherent X-rays reveal the influence of cage effects on ultrafast water dynamics
The dynamics of liquid water feature a variety of time scales, ranging from extremely fast ballistic-like thermal motion, to slower molecular diffusion and hydrogen-bond rearrangements. Here, we utilize coherent X-ray pulses to investigate the sub-100 fs equilibrium dynamics of water from ambient conditions down to supercooled temperatures [...]
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2018-04-17
14:45
OpenAccess [PUBDB-2018-01732] Journal Article
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Towards ultrafast dynamics with split-pulse X-ray photon correlation spectroscopy at free electron laser sources
One of the important challenges in condensed matter science is to understand ultrafast, atomic-scale fluctuations that dictate dynamic processes in equilibrium and non-equilibrium materials. Here, we report an important step towards reaching that goal by using a state-of-the-art perfect crystal based split-and-delay system, capable of splitting individual X-ray pulses andintroducing femtosecond to nanosecond time delays. [...]
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2018-04-06
11:32
OpenAccess [PUBDB-2018-01633] Journal Article
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Heterogeneous local order in self-assembled nanoparticle films revealed by X-ray Cross Corelation
IUCrJ 5(3), 354 - 360 () [10.1107/S2052252518005407]  GO
We report on the self-assembly of gold nanoparticles coated with a soft poly(ethylene glycol) shell studied by X-ray cross-correlation analysis. Depending on the initial concentration of gold nanoparticles used, structurally heterogeneous films were formed [...]
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2018-03-08
11:38
OpenAccess [PUBDB-2018-01437] Journal Article
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Note: Soft X-ray transmission polarizer based on ferromagnetic thin films
A transmission polarizer for producing elliptically polarized soft X-ray radiation from linearly polarized light is presented. The setup is intended for use at synchrotron and free-electron laser beamlines that do not directly offer circularly polarized light for, e.g., X-ray magnetic circular dichroism (XMCD) measurements or holographic imaging. [...]
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2018-01-10
14:05
[PUBDB-2018-00361] Journal Article
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A new class of copolymer colloids with tunable, low refractive index for investigations of structure and dynamics in concentrated suspensions
Highly charged polymer colloids may serve as model systems for the investigation of condensed matter, if they self-organize to liquid-like, glassy or crystalline phases. Multiple scattering due to refractive index differences of colloidal particles and suspending medium is a serious problem when utilizing light scattering experiments for these investigations. [...]
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2017-12-28
18:12
[PUBDB-2017-14145] Journal Article
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Structure and Stability of PEG- and Mixed PEG-Layer-Coated Nanoparticles at High Particle Concentrations Studied In Situ by Small-Angle X-Ray Scattering
Ligand-layer structure and stability of gold nanoparticles (AuNP) coated with α-methoxypoly(ethylene glycol)-ω-(11-mercaptoundecanoate) (PEGMUA) layers and mixed layers of PEGMUA and 11-mercaptoundecanoic acid (MUA) at high AuNP concentrations are studied in situ by small-angle X-ray scattering (SAXS). The thickness of the ligand layer is modified by the molecular weight of the PEG-ligands (2 and 5 kDa), and the PEG-grafting density is decreased by coadsorption of MUA. [...]
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2017-12-12
17:23
OpenAccess [PUBDB-2017-13374] Master Thesis

Double Pulse Correlation Spectroscopy with Visible Light
Hamburg : DESY , 54 pp. () [10.3204/PUBDB-2017-13374] = Masterarbeit, University Of Hamburg, 2017  GO
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2017-11-29
09:44
OpenAccess [PUBDB-2017-12487] Preprint
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Temperature dependence of the hydrogen bond network in trimethylamine N-oxide and guanidine hydrochloride–water solutions
 GO
We present an X-ray Compton scattering study on aqueous Trimethylamine N-oxide (TMAO) and guanidine hydrochloride solutions (GdnHCl) as a function of temperature. Independent from the concentration of the solvent, Compton profiles almost resemble results for liquid water as a function of temperature. [...]
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2017-11-03
10:58
OpenAccess [PUBDB-2017-11675] Bachelor Thesis
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Charakterisierung von Liquid Jets unter der Verwendung von Glasdüsen mit und ohne piezoelektrischen Trigger
, 1-74 () [10.3204/PUBDB-2017-11675] = Bachelorarbeit, Fachhochschule Lübeck, 2017  GO
Liquid Jets finden heute Verwendung in vielen Bereichen der Wissenschaft und der Technik. In dieser Arbeit werden Liquid Jets für Röntgenstreuexperimente im Vakuum charakterisiert [...]
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2017-10-24
16:46
[PUBDB-2017-11542] Journal Article
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Implications of a Temperature-Dependent Magnetic Anisotropy for Superparamagnetic Switching
The macroscopic magnetic moment of a superparamagnetic system has to overcome an energy barrier in order to switch its direction. This barrier is formed by magnetic anisotropies in the material and may be surmounted typically after $10^9 - 10^{12}$ attempts per second by thermal fluctuations. [...]
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