The formation of the triangular Skyrmion lattice is found in a tetragonal polar magnet ${\mathrm{VOSe}}_{2}{\mathrm{O}}_{5}$. By magnetization and small-angle neutron scattering measurements on single crystals, we identify cycloidal spin state at zero field N\'eel-type Skyrmion-lattice phase under magnetic along axis. Adjacent to this phase, another an incommensurate texture identified lower temperatures, tentatively assigned square phase. These findings exemplify versatile features...

The KWS-1 small-angle neutron scattering (SANS) instrument operated by the Jülich Centre for Neutron Science (JCNS) at research reactor FRM II of Heinz Maier-Leibnitz Zentrum in Garching near Munich has been recently upgraded. was updated, from its active collimation apertures to detector cabling. Most parts were installed first time, including a broadband polarizer, large-cross-section radio-frequency spin flipper, chopper and lenses. A custom-designed hexapod sample position allows heavy...

We present neutron scattering data on the structure and dynamics of melts from polyethylene oxide rings with molecular weights up to ten times entanglement mass linear counterpart. The reveal a very compact conformation displaying approaching fractal, as hypothesized by recent simulation work. is characterized fast Rouse relaxation subunits (loops) slower lattice animal-like loop displacement. size an intrinsic property ring architecture independent weight. This first experimental...

Abstract Understanding the assembly of nanoparticles into superlattices with well-defined morphology and structure is technologically important but challenging as it requires novel combinations in-situ methods suitable spatial temporal resolution. In this study, we have followed evaporation-induced during drop casting superparamagnetic, oleate-capped γ -Fe 2 O 3 nanospheres dispersed in toluene real time Grazing Incidence Small Angle X-ray Scattering (GISAXS) combination droplet height...

Abstract Porosity of shales is an important parameter that impacts rock strength for seal or wellbore integrity, gas-in-place calculations unconventional resources the diffusional solute and gas transport in these microporous materials. From a well section obtained from Mont Terri Underground Rock Laboratory St Ursanne, Switzerland, we determined porosity, pore size distribution specific surface areas on set 13 Opalinus Clay samples. The porosity methods employed are helium-pycnometry, water...

The combination of a set complementary techniques allows us to construct an unprecedented and comprehensive picture the internal structure, temperature dependent swelling behavior, dependence these properties on cross-linker concentration microgel particles based N-vinylcaprolactam (VCL). microgels were synthesized by precipitation polymerization using different amounts cross-linking agent. Characterization was performed small-angle neutron scattering (SANS) two instruments cover uniquely...

The KWS-1, which is operated by JCNS, Forschungszentrum Jülich, a small-angle neutron scattering diffractometer dedicated to high resolution measurements.

Using neutron spin echo spectroscopy, we show that the segmental dynamics of polymer rings immersed in linear chains is completely controlled by host. This transforms into ideal probes for studying entanglement embedding matrix. As a consequence unique ring topology, long chain matrices spacing directly revealed, unaffected local reptation host molecules beyond this distance. In shorter entangled matrices, where time frame experiment secondary effects such as contour length fluctuations or...

We report a real-time study on protein crystallization in the presence of multivalent salts using small angle X-ray scattering (SAXS) and optical microscopy, focusing particularly nucleation mechanism as well role metastable intermediate phase (MIP). Using bovine beta-lactoglobulin model system divalent salt CdCl2, we have monitored early stage kinetics which demonstrates two-step mechanism: aggregates form MIP, is followed by crystals within MIP. Here focus characterizing tuning structure...

Antiphase boundaries in iron oxide nanoparticles with oleic acid coating were found to be a major contributor the observed reduction saturation magnetization.

A common feature of ionic liquids composed cations with long aliphatic side chains is structural heterogeneities on the nanometer length scale. This so-called microphase separation arises from clustering moieties. The temperature dependence liquid bulk structure was studied by small-angle X-ray and neutron scattering for a set methylimidazolium ([C18C1im]+, [C22C1im]+) based tris(pentafluoroethyl)trifluorophosphate ([FAP]-), bis(trifluoromethylsulfonyl)imide ([NTf2]-),...

The internal structure of nanometric microgels in water has been studied as a function temperature, cross-linker content, and level deuteration. Small-angle neutron scattering from poly(N-isopropylmethacrylamide) (volume phase transition ≈ 44 °C) microgel particles radius well below 100 nm D2O measured. intensities have analyzed with combination polymer chain form-free radial monomer volume fraction profiles defined over spherical shells, taking polydispersity size the determined by atomic...

The magnetic-field-induced assembly of magnetic nanoparticles (NPs) provides a unique and flexible strategy in the design fabrication functional nanostructures devices. We have investigated field-induced self-assembly core-shell iron oxide NPs dispersed toluene by means small-angle neutron scattering (SANS). form factor was characterized analyzed using SANS with polarized neutrons. Large-scale aggregates formed above 0.02 T as indicated very-small-angle measurements. A three-dimensional...

Ferrofluids typically respond to magnetic fields and can be manipulated by external fields. Here, we report on formation of visually observable patterns in a diluted low-polarity ferrofluid exposed electric This presents specific type structure driven combined effect electrohydrodynamics electrical body forces. The free charge permittivity variation are considered play key role the observed phenomenon. corresponding changes have been found at nanoscale as well. By small-angle neutron...

The phase behavior of supersoft spheres is explored using solutions ultralow cross-linked poly(N-isopropylacrylamide)-based microgels as a model system. For these microgels, the effects electric charges on their surfaces can be neglected and therefore only role softness investigated. samples show liquid-to-crystal transition at higher volume fraction with respect to both hard stiffer microgels. Furthermore, stable body centered cubic (bcc) crystals are observed in addition expected face...

Contrast variation in small-angle neutron scattering (SANS) experiments is used to compare the structures of a water-based ferrofluid, where magnetite nanoparticles are stabilized by sodium oleate, and its mixture with biocompatible polyethylene glycol, PEG. The basic functions approach applied, which takes into account effects polydispersity magnetic scattering. Different types stable aggregates colloidal particles revealed both fluids. addition PEG results reorganization structure...

We report a neutron-scattering investigation on the structure and dynamics of single-component nanocomposite based SiO_{2} particles that were grafted with polyisoprene chains at entanglement limit. By skillful labeling, we access both monomer density in corona as well conformation chains. While profile follows r^{-1} power law, chain is identical to reference melt, implying high mutual penetration coronas from different particles. The brush crowding leads topological confinement dynamics:...

The magnetic system of the Mn$_{1-x}$Fe$_{x}$Ge solid solution is ordered in a spiral spin structure whole concentration range $x \in [0 \div 1]$. close inspection small-angle neutron scattering data reveals quantum phase transition from long-range (LRO) to short (SRO) helical upon increase Fe-concentration at [0.25 0.4]$. SRO identified as Lorentzian contribution, while LRO associated with Gaussian contribution into profile function. scenario $x$ driving parameter similar thermal pure MnGe....

While mesoporous silicas have been shown to be a compelling candidate for drug delivery and the implementation of biotechnological applications requiring protein confinement immobilization, understanding behavior upon physical adsorption into silica pores is limited. Many indirect methods are available assess general adsorbed stability, such as Fourier-transform infrared spectroscopy activity assays. However, limitation these that spatial arrangement within cannot assessed. Mesoporous pose...

In a strong magnetic field, the cores of nanoparticles grow because realignment surrounding spins, challenging commonly held assumption constant nanoparticle moment.

Structure analysis of a magnetic fluid (nanoparticles maghemite dispersed in water with charge stabilization and without surfactant) by means small-angle neutron scattering is presented. A combination the contrast variation technique polarized neutrons was applied. In first case, curves obtained for unmagnetized heavy content carrier are treated terms basic functions approach. The almost homogeneous character nanoparticles respect to nuclear length density makes it possible separate...