cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e.rb2420194
title: Single ion anisotropy of Kagome spin ice HoAgGe and DyAgGe by inelastic neutron scattering

description: Spin ices are exotic phases of matter characterized by frustrated spins obeying local “ice rules” that minimize the number of spatially isolated magnetic monopoles, in analogy with the electric dipoles in water ice. HoAgGe, as one example of the ReAgGe system, attracted much attention as the first discovery of Kagome Spin Ice in the intermetallic system. Alternating clockwise and counter-clockwise order was founded at base temperature. The behavior of Kagome Spin Ice is strongly influenced by the single-ion anisotropy properties, which are determined by the crystal electric field (CEF) ground state. We propose utilizing the MARI instrument to investigate the crystal field excitations of HoAgGe and DyAgGe, utilizing 3g non-aligned single crystals samples (in powder form), which will allow to fit the observed CEF excitations using the Mantid CEF program. We estimate 3 days of beam time to complete the proposed measurements on three samples.
DOI: 10.5286/isis.e.rb2420373
title: Linking local structural distortions to global symmetry-breaking in hexagonal BaTiO3

description: Ferroelectric (FE) ceramics comprise critical components of contemporary electronic devices due to their appealing electromechanical properties. BaTiO3 is one of the most renowned FE materials owing to its complex sequence of phase transitions away from cubic symmetry, which we have recently been shown to be compatible with an order-disorder mechanism rather than the more traditional displacive mechanism invoked previously. However, it is currently unclear how such a mechanism may be compatible with more complex chemical architectures which do not exhibit such high symmetry as the perovskite aristotype. We have recently revisited the crystal structure of the FE six-layer hexagonal (6H) polytype of BaTiO3, which possesses a contrasting structural topology compared to the cubic polytype. Several signatures of local structural distortions have been previously evidenced to occur in this material, though no local structural studies have ever been performed to corroborate these findings. We expect global symmetry-breaking distortions in 6H-BaTiO3 will be anticipated by local structural distortions as our recent insight into the cubic polytype has demonstrated, so we seek to perform a bespoke total scattering experiment on Polaris to study the transferability of the order-disorder model of ferroelectricity to 6H-BaTiO3. This will inform how similarly appealing FE functionalities may be realised through local symmetry-breakings across a much broader array of material architectures.
DOI: 10.5286/isis.e.rb2420373-1
title: Linking local structural distortions to global symmetry-breaking in hexagonal BaTiO3

description: Ferroelectric (FE) ceramics comprise critical components of contemporary electronic devices due to their appealing electromechanical properties. BaTiO3 is one of the most renowned FE materials owing to its complex sequence of phase transitions away from cubic symmetry, which we have recently been shown to be compatible with an order-disorder mechanism rather than the more traditional displacive mechanism invoked previously. However, it is currently unclear how such a mechanism may be compatible with more complex chemical architectures which do not exhibit such high symmetry as the perovskite aristotype. We have recently revisited the crystal structure of the FE six-layer hexagonal (6H) polytype of BaTiO3, which possesses a contrasting structural topology compared to the cubic polytype. Several signatures of local structural distortions have been previously evidenced to occur in this material, though no local structural studies have ever been performed to corroborate these findings. We expect global symmetry-breaking distortions in 6H-BaTiO3 will be anticipated by local structural distortions as our recent insight into the cubic polytype has demonstrated, so we seek to perform a bespoke total scattering experiment on Polaris to study the transferability of the order-disorder model of ferroelectricity to 6H-BaTiO3. This will inform how similarly appealing FE functionalities may be realised through local symmetry-breakings across a much broader array of material architectures.
DOI: 10.3535/q5r-6ln-s9j
title: Draba L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/tv1-gr7-by2
title: Hordeum murinum subsp. leporinum (Link) Arcang.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2410340
title: Phase transitions and plateaux in the molecular trimer system Ni3(acac)6(pym)4

description: We seek to investigate a novel molecular magnetic system Ni$_{3}$(acac)$_{6}$pym$_{4}$ that exhibits magnetization plateaux. The material is formed from trimers of Ni2+ spins, joined together in a zig-zag motif by pym ligands, and separated from other trimers by the acac groups. We will probe the possible magnetic phase transition occurring in zero field around 10 K and, using the unique capabilities of HIFI, the dynamics of the magnetization plateau that occurs above 1.8 T.
DOI: 10.5286/isis.e.rb2410340-1
title: Phase transitions and plateaux in the molecular trimer system Ni3(acac)6(pym)4

description: We seek to investigate a novel molecular magnetic system Ni$_{3}$(acac)$_{6}$pym$_{4}$ that exhibits magnetization plateaux. The material is formed from trimers of Ni2+ spins, joined together in a zig-zag motif by pym ligands, and separated from other trimers by the acac groups. We will probe the possible magnetic phase transition occurring in zero field around 10 K and, using the unique capabilities of HIFI, the dynamics of the magnetization plateau that occurs above 1.8 T.
DOI: 10.5286/isis.e.rb2410741-2
title: In Situ Study of Structure and Fracture Mechanisms in Polygranular Ti- and Cr- MAX-Phases

description: This proposal focuses on an in-situ study of Ti- and Cr-MAX-Phases, complex metal-ceramic materials with potential applications in Gen-IV reactor systems. These MAX-Phases possess a unique hexagonal-layered structure and excellent machinability, corrosion resistance, and radiation-induced crack healing properties. The study aims to investigate the response of industrially-producible multi-phase MAX-Phases to stress and temperature conditions typical of their proposed operational environments. Neutron diffraction and Digital Image Correlation will be used to identify phase constituents and understand their crystallographic deformation mechanisms. This will chiefly provide insights into the effects of turbostratic layering on diffraction spectra, necessary for the development of Rietveld refinement for layered materials such as MAX-Phases and graphite.
DOI: 10.3535/tw8-rfd-t9l
title: Festuca Tourn. ex L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/xpq-lgg-nyy
title: Distichlis spicata (L.) Greene

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2410741
title: In Situ Study of Structure and Fracture Mechanisms in Polygranular Ti- and Cr- MAX-Phases
DOI: 10.5286/isis.e.rb2420122
title: Alignment of Charge Density Waves in Binary Complex Fluids and a Surfactant

description: Electrolytes involving polar/non-polar components and ions have wide-spread applications as electrolytes in batteries and fuel / electrolyser cells. The dynamics and diffusion constants of all the different components are usually connected to the transport coefficients that determine the maximum current in the application [1]. The structure of the domains provides a fundamental understanding of the transport properties [1], but also is highly interesting for the academic understanding of such systems. Close to the phase boundary of miscibility, strong composition fluctuations may develop [1,2]. Here, the Ising criticality comes into play, that responds to the arrangement of the ions (of the surfactant or antagonistic salt). Charge density waves are usually formed with a locally lamellar character, and so the binary fluid is confined to 2 dimensions. However, the high-Q small-angle scattering reveals also the influence of the third missing dimension [2], and so an orientational average of 2-dimensional confinement and the third dimension is observed. To deconvolute the averaging of the scattering in different directions we propose to orient the domains of the composition fluctuations in an external magnetic field and observe them using small angle neutron scattering on LAMOR.
DOI: 10.5286/isis.e.rb2420122-1
title: Alignment of Charge Density Waves in Binary Complex Fluids and a Surfactant

description: Electrolytes involving polar/non-polar components and ions have wide-spread applications as electrolytes in batteries and fuel / electrolyser cells. The dynamics and diffusion constants of all the different components are usually connected to the transport coefficients that determine the maximum current in the application [1]. The structure of the domains provides a fundamental understanding of the transport properties [1], but also is highly interesting for the academic understanding of such systems. Close to the phase boundary of miscibility, strong composition fluctuations may develop [1,2]. Here, the Ising criticality comes into play, that responds to the arrangement of the ions (of the surfactant or antagonistic salt). Charge density waves are usually formed with a locally lamellar character, and so the binary fluid is confined to 2 dimensions. However, the high-Q small-angle scattering reveals also the influence of the third missing dimension [2], and so an orientational average of 2-dimensional confinement and the third dimension is observed. To deconvolute the averaging of the scattering in different directions we propose to orient the domains of the composition fluctuations in an external magnetic field and observe them using small angle neutron scattering on LAMOR.
DOI: 10.3535/aem-n5l-d53
title: Polypogon monspeliensis (L.) Desf.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220017-1
title: Light-induced dynamics changes of a LOV photoreceptor investigated using time-resolved quasi-elastic neutron scattering

description: Members of the LOV protein family are blue-light photoreceptors employing LOV domains as photosensory modules. LOV domains are structurally well-conserved that typically bind a flavin chromophore. Upon light absorption, they undergo a covalent bond formation between the C4a atom of the flavin ring and the sulfur of the neighboring cysteine residue. The photocycle is thermally reversible and in the dark, the FMN-cysteinyl adduct decays to the ground state on a timescale of seconds to days. In this proposal, we suggest investigating changes of molecular dynamics through the dark recovery process of the photoreceptor PpSB1-LOV by time-resolved (TR) QENS experiments on IRIS after illumination of the photoreceptor in situ in the neutron beam. TR-QENS experiments are suggested to be performed as function of temperature to provide deeper insights into the kinetic mechanism.
DOI: 10.5286/isis.e.rb2410730
title: Probing the dynamics of sodium amide across the melt transition

description: Sodium amide has recently been explored as a highly active catalyst for the decomposition of ammonia to hydrogen. However, relatively little is known about the structure and dynamics of the material, particularly in the melt phase which is of direct relevance to its catalytic activity. We propose to conduct a three-part investigation of sodium amide (and its deuterated analogue) using the VESUVIO spectrometer. We will probe the kinetic energy and momentum distribution of the hydrogen/deuterium across the melt transition, and simultaneously use neutron transmission measurements to clarify the density of the material in the melt, which is not currently well-understood. Finally, we will make use of the new high-resolution detector to investigate the broadening of the gamma resonance peak to determine its relationship to the kinetic energy of the sodium ions.
DOI: 10.5286/isis.e.rb2410730-1
title: Probing the dynamics of sodium amide across the melt transition

description: Sodium amide has recently been explored as a highly active catalyst for the decomposition of ammonia to hydrogen. However, relatively little is known about the structure and dynamics of the material, particularly in the melt phase which is of direct relevance to its catalytic activity. We propose to conduct a three-part investigation of sodium amide (and its deuterated analogue) using the VESUVIO spectrometer. We will probe the kinetic energy and momentum distribution of the hydrogen/deuterium across the melt transition, and simultaneously use neutron transmission measurements to clarify the density of the material in the melt, which is not currently well-understood. Finally, we will make use of the new high-resolution detector to investigate the broadening of the gamma resonance peak to determine its relationship to the kinetic energy of the sodium ions.
DOI: 10.34816/ifao.archives.232867
title: SAQQARA_nb_1994_03345

description: Référence : nb_1994_03345<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/3zf-n14-frm
title: Pyrus syriaca Boiss.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/fha-jz8-254
title: Polypogon interruptus Kunth

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220017
title: Light-induced dynamics changes of a LOV photoreceptor investigated using time-resolved quasi-elastic neutron scattering

description: Members of the LOV protein family are blue-light photoreceptors employing LOV domains as photosensory modules. LOV domains are structurally well-conserved that typically bind a flavin chromophore. Upon light absorption, they undergo a covalent bond formation between the C4a atom of the flavin ring and the sulfur of the neighboring cysteine residue. The photocycle is thermally reversible and in the dark, the FMN-cysteinyl adduct decays to the ground state on a timescale of seconds to days. In this proposal, we suggest investigating changes of molecular dynamics through the dark recovery process of the photoreceptor PpSB1-LOV by time-resolved (TR) QENS experiments on IRIS after illumination of the photoreceptor in situ in the neutron beam. TR-QENS experiments are suggested to be performed as function of temperature to provide deeper insights into the kinetic mechanism.
DOI: 10.5286/isis.e.rb2220191
title: InInvestigating the influence of porosity and reactant diffusion on alkane isomerisation

description: The isomerisation of n-butane is the main route to isobutane, a market valued at $20 billion, due to isobutanes use as a fuel additive, propellant and precursor for tert-butyl hydroperoxide. Zeolite catalysts are suited to this reaction because their micropores offer a confined space to control the reaction pathway and prevent bulky side products forming. However it is important that diffusion through the porous framework is not hindered, as this will lower the reaction conversion. Therefore we propose to contrast the diffusion of n-butane in three different zeotype frameworks with different porosities, but identical active sites. Thus allowing us to focus purely on the diffusion characteristics of the framework, to explain the significant differences in catalytic activity. We will investigate the diffusion of n-butane through the internal pores of CoAlPO-5, CoAlPO-11 and CoAlPO-18.
DOI: 10.5286/isis.e.rb2220191-1
title: InInvestigating the influence of porosity and reactant diffusion on alkane isomerisation

description: The isomerisation of n-butane is the main route to isobutane, a market valued at $20 billion, due to isobutanes use as a fuel additive, propellant and precursor for tert-butyl hydroperoxide. Zeolite catalysts are suited to this reaction because their micropores offer a confined space to control the reaction pathway and prevent bulky side products forming. However it is important that diffusion through the porous framework is not hindered, as this will lower the reaction conversion. Therefore we propose to contrast the diffusion of n-butane in three different zeotype frameworks with different porosities, but identical active sites. Thus allowing us to focus purely on the diffusion characteristics of the framework, to explain the significant differences in catalytic activity. We will investigate the diffusion of n-butane through the internal pores of CoAlPO-5, CoAlPO-11 and CoAlPO-18.
DOI: 10.3535/kcz-yvp-mp4
title: Bryonia syriaca Boiss.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/w2m-s21-9h7
title: Lolium temulentum L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2420429
title: Understanding of Quantum Spin Liquid in a natural mineral Henmilite

description: Natural minerals have become a playground for exploring exotic quantum states such as quantum spin liquid, pure Kitaev physics etc. In
many cases, when the recipe of crystal growth is not known, natural specimens remain the only option for investigating these unusual
lattices. Henmilite is a new mineral which has been suggested to consist of coupled spin two-leg ladders, where strong quantum
fluctuations suppress long-range order at low temperatures. Our recent MuSR experiment revealed a QSL phase at zero field while the specific heat experiment questions the magnetic coupled two-leg ladder structure story. Therefore, we want to investigate the spin structure under an external magnetic field in order to elucidate the underlying mechanisms responsible for the suggested quantum spin liquid behaviour through a neutron diffraction experiment at WISH using a dilution refrigerator.
DOI: 10.5286/isis.e.rb2420429-1
title: Understanding of Quantum Spin Liquid in a natural mineral Henmilite

description: Natural minerals have become a playground for exploring exotic quantum states such as quantum spin liquid, pure Kitaev physics etc. In
many cases, when the recipe of crystal growth is not known, natural specimens remain the only option for investigating these unusual
lattices. Henmilite is a new mineral which has been suggested to consist of coupled spin two-leg ladders, where strong quantum
fluctuations suppress long-range order at low temperatures. Our recent MuSR experiment revealed a QSL phase at zero field while the specific heat experiment questions the magnetic coupled two-leg ladder structure story. Therefore, we want to investigate the spin structure under an external magnetic field in order to elucidate the underlying mechanisms responsible for the suggested quantum spin liquid behaviour through a neutron diffraction experiment at WISH using a dilution refrigerator.
DOI: 10.34816/ifao.archives.232868
title: SAQQARA_nb_1994_03346

description: Référence : nb_1994_03346<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/a74-z44-dpq
title: Geranium

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/jzz-cvp-pm7
title: Mimulus ringens L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2420195-1
title: Lipid nanocapsules drug carriers for Benzocain delivery

description: Benzocaine (BZC) is a local anesthetic synthesized through the esterification of para-amino benzoic acid (PABA) and commonly used in dentistry for local antinociception in mucous membranes. Unlike other commercial local anesthetics, BZC does not possess an ionizable amino group near physiological pH, exhibiting a neutral charge at pHs above 3 and limited water solubility. There are reports of systemic toxicity with BZC use, due to the formation of methemoglobin by PABA, a product of its degradation, leading to functional anemia and tissue hypoxia. Another substance widely used in dental practice is eugenol (EUG), found in clove oil. Eugenol, being lipophilic, has several bioactive properties, including anesthetic effect. In this project, we prepared drug-delivery systems (DDS), i.e. lipid nanocapsules (LNC)[1] to co-encapsulate BZC and EUG. Our aim is to prolong the analgesic effect, enhance the therapeutic effects of the drugs, and reduce their toxicity. Essentially, the inclusion of eugenol not only diversifies the composition of the formulation but also enhances the effectiveness of the pharmaceutical strategy employed, paving the way for more comprehensive and efficient solutions in the field of dental anesthesia. LNC, composed of an oily core surrounded by a layer of non-ionic surfactant, are particularly effective as carriers for hydrophobic drugs and, due to their high surfactant concentration, have diameters below 100 nm, making them ideal for topical applications.
DOI: 10.5286/isis.e.rb2469103
title: Self-assembly of graphene oxide nanosheets and polymers: formation of noncovalent rheological complexes

description: In this work, we wish to explore the self-assembly of graphene oxide nanosheets and various polymeric compounds in water. We will perform small-angle neutron scattering (SANS) measurements to determine the internal structure of such assemblies, and from these data infer the predominating interactions that enable effective composite formation between GO and polymers of specific chemistries. We hope to build upon preliminary results concerning such systems in water, thus aiding in unravelling the relationships between GO and polymer chemistry, system conditions and colloidal forces. This will enable the informed design of new, noncovalent composite materials that will likely possess enhanced rheological properties and/or liquid crystalline properties.
DOI: 10.5286/isis.e.rb2469103-1
title: Self-assembly of graphene oxide nanosheets and polymers: formation of noncovalent rheological complexes

description: In this work, we wish to explore the self-assembly of graphene oxide nanosheets and various polymeric compounds in water. We will perform small-angle neutron scattering (SANS) measurements to determine the internal structure of such assemblies, and from these data infer the predominating interactions that enable effective composite formation between GO and polymers of specific chemistries. We hope to build upon preliminary results concerning such systems in water, thus aiding in unravelling the relationships between GO and polymer chemistry, system conditions and colloidal forces. This will enable the informed design of new, noncovalent composite materials that will likely possess enhanced rheological properties and/or liquid crystalline properties.
DOI: 10.3535/ml7-qfd-aex
title: Nothofagus dombeyi (Mirb.) Oerst.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/xme-qgn-pz8
title: Nothofagus antarctica (G.Forst.) Oerst.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.