cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e.rb2410037
title: Investigating CO2 Hydrate Phases in Confinement using Neutron Diffraction

description: Clathrate hydrate is crucial for carbon capture, thermal storage, hydrogen storage, and desalination. Understanding CO2 hydrate microparticles' phase transitions and crystal structures is essential. We employ neutron diffraction to investigate CO2 hydrate phases in confinement, offering deep matter penetration.
Experiments will be conducted on the GEM instrument at various gas pressures and 277.15 K, studying CO2 hydrate microparticles encapsulated in dry water (hydrophobic silica, H18). Insights into CO2 hydrate formation and stability mechanisms in dry water will be gained. The data will enhance hydrate-based system efficiency, enabling eco-friendly and cost-effective solutions for greenhouse gas mitigation, energy storage and recovery, and renewable energy and clean water promotion.
This project's successful completion will impact industries and address environmental and energy challenges. Building an in-depth collaboration with Australia National University, we will combine expertise with the GEM instrument's capabilities to achieve a comprehensive understanding of CO2 hydrate phases in confinement and their implications for clathrate hydrate technology. This collaboration will foster knowledge exchange and strengthen international research ties, paving the way for future advancements.
DOI: 10.5286/isis.e.rb2410037-2
title: Investigating CO2 Hydrate Phases in Confinement using Neutron Diffraction

description: Clathrate hydrate is crucial for carbon capture, thermal storage, hydrogen storage, and desalination. Understanding CO2 hydrate microparticles' phase transitions and crystal structures is essential. We employ neutron diffraction to investigate CO2 hydrate phases in confinement, offering deep matter penetration.
Experiments will be conducted on the GEM instrument at various gas pressures and 277.15 K, studying CO2 hydrate microparticles encapsulated in dry water (hydrophobic silica, H18). Insights into CO2 hydrate formation and stability mechanisms in dry water will be gained. The data will enhance hydrate-based system efficiency, enabling eco-friendly and cost-effective solutions for greenhouse gas mitigation, energy storage and recovery, and renewable energy and clean water promotion.
This project's successful completion will impact industries and address environmental and energy challenges. Building an in-depth collaboration with Australia National University, we will combine expertise with the GEM instrument's capabilities to achieve a comprehensive understanding of CO2 hydrate phases in confinement and their implications for clathrate hydrate technology. This collaboration will foster knowledge exchange and strengthen international research ties, paving the way for future advancements.
DOI: 10.5286/isis.e.rb2510543-1
title: Interference of neutron Airy beams with orbital angular momentum states

description: We have developed a method to advance SANS techniques by revealing the phase profile of the neutron wave function. This is important as in typical SANS experiments, neutrons are detected in the far-field where phase information is lost. The ability to recover phase information in SANS measurements is becoming increasingly important due to the rapid progress in the production and detection of structured neutron waves within the last 10 years. We are the first group to generate and detect neutron OAM beams and neutron Airy beams. Here we aim to extend our interferometric method that extracts phase information in SANS measurements by interfering more complex neutron waves such as Airy beams and different orbital angular momentum (OAM) states.
DOI: 10.15468/dl.fym5ne
title: Occurrence Download

description: A dataset containing 487 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Rudbeckia laciniata L.",
 "Country is Austria",
 "HasCoordinate is true"
 ]
}

 The dataset includes 487 records from 15 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0109295-250525065834625/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.3535/gnq-4nz-trh
title: Euphrasia L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/s0m-klk-nvz
title: Nothofagus antarctica (G.Forst.) Oerst.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2510543
title: Interference of neutron Airy beams with orbital angular momentum states

description: We have developed a method to advance SANS techniques by revealing the phase profile of the neutron wave function. This is important as in typical SANS experiments, neutrons are detected in the far-field where phase information is lost. The ability to recover phase information in SANS measurements is becoming increasingly important due to the rapid progress in the production and detection of structured neutron waves within the last 10 years. We are the first group to generate and detect neutron OAM beams and neutron Airy beams. Here we aim to extend our interferometric method that extracts phase information in SANS measurements by interfering more complex neutron waves such as Airy beams and different orbital angular momentum (OAM) states.
DOI: 10.5286/isis.e.rb2510563
title: Study of Nanostructure and Hydration Behavior in Zinc Chloride-Based Electrolytes for High-Energy-Density Batteries

description: The transition towards sustainable energy solutions has intensified the research on alternative battery chemistries. Zinc-metal batteries (ZMB) and Zinc-air batteries (ZAB) emerge as promising candidates due to their high energy density and cost-effectiveness. However, their widespread adoption is hindered by the limited reversibility of the Zn anode in aqueous electrolytes, which results in low Coulombic efficiency and dendrite formation. Recent studies have focused on Water-in-Salt Electrolytes (WISE) with highly concentrated ZnCl₂ solutions, improving battery performance by mitigating dendrite growth. Moreover, ZnCl₂ + LiCl Water-in-Bisalt Electrolytes (WIBE) have demonstrated exceptional stability and efficiency. Despite these advances, the nanostructure of these electrolytes remains poorly understood. Building on our previous work using Small-Angle Neutron Scattering (SANS) to investigate nanostructural heterogeneities in Li-based WISEs, this proposal aims to characterize the nano-heterogeneities in ZnCl₂-based WISE and WIBE systems. SANS measurements will be conducted across different concentrations and temperatures, applying the Teubner-Strey model to elucidate the structural dynamics and the role of Li⁺ ions in these systems. Insights from this study will provide a deeper understanding of the ion transport mechanisms and structural behavior in Zn-based electrolytes, advancing their application in next-generation batteries.
DOI: 10.5286/isis.e.rb2510563-1
title: Study of Nanostructure and Hydration Behavior in Zinc Chloride-Based Electrolytes for High-Energy-Density Batteries

description: The transition towards sustainable energy solutions has intensified the research on alternative battery chemistries. Zinc-metal batteries (ZMB) and Zinc-air batteries (ZAB) emerge as promising candidates due to their high energy density and cost-effectiveness. However, their widespread adoption is hindered by the limited reversibility of the Zn anode in aqueous electrolytes, which results in low Coulombic efficiency and dendrite formation. Recent studies have focused on Water-in-Salt Electrolytes (WISE) with highly concentrated ZnCl₂ solutions, improving battery performance by mitigating dendrite growth. Moreover, ZnCl₂ + LiCl Water-in-Bisalt Electrolytes (WIBE) have demonstrated exceptional stability and efficiency. Despite these advances, the nanostructure of these electrolytes remains poorly understood. Building on our previous work using Small-Angle Neutron Scattering (SANS) to investigate nanostructural heterogeneities in Li-based WISEs, this proposal aims to characterize the nano-heterogeneities in ZnCl₂-based WISE and WIBE systems. SANS measurements will be conducted across different concentrations and temperatures, applying the Teubner-Strey model to elucidate the structural dynamics and the role of Li⁺ ions in these systems. Insights from this study will provide a deeper understanding of the ion transport mechanisms and structural behavior in Zn-based electrolytes, advancing their application in next-generation batteries.
DOI: 10.34816/ifao.archives.232962
title: SAQQARA_nb_1994_06028

description: Référence : nb_1994_06028<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/d0s-m1j-jfb
title: Nothofagus antarctica (G.Forst.) Oerst.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/pbh-eam-ea1
title: Geranium molle L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2410361-1
title: Synergistic interactions between antimicrobial peptides magainin 2 and PGLa

description: We suggest to measure the depth of penetration of two cationic antimicrobial peptides, namely magainin 2 (mag2) and PGLa, added separately and as an equimolar cocktail on single supported lipid bilayers. These peptides are known to exhibit a strong synergetic activity on living organisms but very important questions remain about their structure-function relationship. In particular, we want to know if the interaction between the different molecular systems leads to changes in the bilayer penetration depth. Membranes will be made of lipid mixtures mimicking biological systems (POPE/POPG 3/1, POPC/POPG 3/1 and POPE/POPG 1/3) that will permit to address the question of the role of membrane composition (i.e. POPE vs POPC) and to analyse the effect of anionic lipid concentration. While 25 to 30% of POPG represent well membranes of E. coli much higher lipid content can be encountered with Gram-positive bacterial membranes. 5 days of beamtime on INTER or 6 days on OFFSPEC are requested for this study.
DOI: 10.5286/isis.e.rb2420023
title: Determining the Magnetic Structure of the Field-Induced Sloping 1/3 Magnetization Plateau in a Spin-1 Kitaev Candidate Material

description: A group of 2D layered honeycomb magnets, A3Ni2XO6 (A = Li, Na; X = Sb, Bi), has attracted much attention due to the potentially realizations of higher-spin Kitaev interactions. A 1/3 magnetization plateau phase, considered as evidence for the Kitaev interaction in Na3Ni2BiO6 (NNBO), has been reported more recently. This finding renders A3Ni2XO6 a highly intriguing system with the potential to realize the S = 1 Kitaev interaction. Meanwhile, several theoretical works on 2D magnets suggest the significance of biquadratic exchange interactions in 2D magnets with edge-shared octahedra. Usually, this term was considered to be small and so could be neglected. Motivated by this, we conducted calculations using the spin-1 J1-J3-D-B model (where D and B denote the single-ion anisotropy and biquadratic exchange) and obtained magnetization curves for NNBO. The theoretical curves is distinct from its experimental results. Surprisingly, its sister compound Na3Ni2SbO6 displays a behavior akin to the calculated magnetization curves.These findings hint at the potential influence of biquadratic exchange in NNSO. Its magnetic structure could provide information on the uncommon biquadratic exchange.
DOI: 10.5286/isis.e.rb2420023-1
title: Determining the Magnetic Structure of the Field-Induced Sloping 1/3 Magnetization Plateau in a Spin-1 Kitaev Candidate Material

description: A group of 2D layered honeycomb magnets, A3Ni2XO6 (A = Li, Na; X = Sb, Bi), has attracted much attention due to the potentially realizations of higher-spin Kitaev interactions. A 1/3 magnetization plateau phase, considered as evidence for the Kitaev interaction in Na3Ni2BiO6 (NNBO), has been reported more recently. This finding renders A3Ni2XO6 a highly intriguing system with the potential to realize the S = 1 Kitaev interaction. Meanwhile, several theoretical works on 2D magnets suggest the significance of biquadratic exchange interactions in 2D magnets with edge-shared octahedra. Usually, this term was considered to be small and so could be neglected. Motivated by this, we conducted calculations using the spin-1 J1-J3-D-B model (where D and B denote the single-ion anisotropy and biquadratic exchange) and obtained magnetization curves for NNBO. The theoretical curves is distinct from its experimental results. Surprisingly, its sister compound Na3Ni2SbO6 displays a behavior akin to the calculated magnetization curves.These findings hint at the potential influence of biquadratic exchange in NNSO. Its magnetic structure could provide information on the uncommon biquadratic exchange.
DOI: 10.3535/evq-00k-n2f
title: Geranium phaeum L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2410361
title: Synergistic interactions between antimicrobial peptides magainin 2 and PGLa

description: We suggest to measure the depth of penetration of two cationic antimicrobial peptides, namely magainin 2 (mag2) and PGLa, added separately and as an equimolar cocktail on single supported lipid bilayers. These peptides are known to exhibit a strong synergetic activity on living organisms but very important questions remain about their structure-function relationship. In particular, we want to know if the interaction between the different molecular systems leads to changes in the bilayer penetration depth. Membranes will be made of lipid mixtures mimicking biological systems (POPE/POPG 3/1, POPC/POPG 3/1 and POPE/POPG 1/3) that will permit to address the question of the role of membrane composition (i.e. POPE vs POPC) and to analyse the effect of anionic lipid concentration. While 25 to 30% of POPG represent well membranes of E. coli much higher lipid content can be encountered with Gram-positive bacterial membranes. 5 days of beamtime on INTER or 6 days on OFFSPEC are requested for this study.
DOI: 10.5286/isis.e.rb2420219-2
title: Magnetic excitations in a magnetized double ladder Cu-CPA

description: Quantum spin ladders bridge the gap between one- and two-dimensional quantum magnets. They feature a complex excitation spectrum that depends on the relative strengths of the leg and rung exchange interactions. While realizations of strong-rung ladders are common, only one strong-leg spin ladder has been studied in detail to date. However, a recent breakthrough in material synthesis, allows us to study a second candidate for the strong-leg regime: (C5H9NH3)2CuBr4 (or Cu-CPA for short). Combining X-ray and neutron scattering, we have found that Cu-CPA, which was initially believed to be a simple spin ladder system, represents the more complex case of a double ladder system, which remains to be explored [1]. Our zero-field inelastic neutron-scattering experiment shows no dispersion perpendicular to the ladder propagation direction, confirming this is indeed a purely one-dimensional system. Additionally, we observed two distinct low-energy modes that are consistent with a double ladder [2]. Preliminary measurements under applied magnetic field hint toward only a partial mode-softening. Therefore, we propose to use neutron spectroscopy under externally applied magnetic fields to study the condensation of magnons and understand the magnetization processes in this double ladder system.

[1] Philippe et. al., submitted to PRB, https://arxiv.org/abs/2404.08274
[2] Philippe et. al., in preparation
DOI: 10.3535/5el-a0t-b7r
title: Quinchamalium chilense Molina

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/krw-akw-8v5
title: Scabiosa canescens Waldst. & Kit.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2310589
title: Sodium (translational) and thiophosphate (rotational) dynamics in the plastic crystalline electrolyte Na3PS4

description: We have recently discovered a high-temperature polymorph of the promising Na-ion conductor, Na3PS4. The new polymorph exhibits plastic crystallinity, with very high sodium (translational) diffusivity and thiophosphate (rotational) diffusivity. These dynamics are expected to be observable by QENS, incoherent for the Na (expected in the 100s of μeV) and coherent for S (expected in the 10s of μeV). Investigating the interplay between anion and cation dynamics, and understanding the how to stabilize such plastic-crystalline ion conductors at lower temperatures would be most impactful in the context of their application as electrolytes for advanced electrochemical devices, in particular batteries.
DOI: 10.5286/isis.e.rb2310589-1
title: Sodium (translational) and thiophosphate (rotational) dynamics in the plastic crystalline electrolyte Na3PS4

description: We have recently discovered a high-temperature polymorph of the promising Na-ion conductor, Na3PS4. The new polymorph exhibits plastic crystallinity, with very high sodium (translational) diffusivity and thiophosphate (rotational) diffusivity. These dynamics are expected to be observable by QENS, incoherent for the Na (expected in the 100s of μeV) and coherent for S (expected in the 10s of μeV). Investigating the interplay between anion and cation dynamics, and understanding the how to stabilize such plastic-crystalline ion conductors at lower temperatures would be most impactful in the context of their application as electrolytes for advanced electrochemical devices, in particular batteries.
DOI: 10.5286/isis.e.rb2420219
title: Magnetic excitations in a magnetized double ladder Cu-CPA

description: Quantum spin ladders bridge the gap between one- and two-dimensional quantum magnets. They feature a complex excitation spectrum that depends on the relative strengths of the leg and rung exchange interactions. While realizations of strong-rung ladders are common, only one strong-leg spin ladder has been studied in detail to date. However, a recent breakthrough in material synthesis, allows us to study a second candidate for the strong-leg regime: (C5H9NH3)2CuBr4 (or Cu-CPA for short). Combining X-ray and neutron scattering, we have found that Cu-CPA, which was initially believed to be a simple spin ladder system, represents the more complex case of a double ladder system, which remains to be explored [1]. Our zero-field inelastic neutron-scattering experiment shows no dispersion perpendicular to the ladder propagation direction, confirming this is indeed a purely one-dimensional system. Additionally, we observed two distinct low-energy modes that are consistent with a double ladder [2]. Preliminary measurements under applied magnetic field hint toward only a partial mode-softening. Therefore, we propose to use neutron spectroscopy under externally applied magnetic fields to study the condensation of magnons and understand the magnetization processes in this double ladder system.

[1] Philippe et. al., submitted to PRB, https://arxiv.org/abs/2404.08274
[2] Philippe et. al., in preparation
DOI: 10.3535/519-err-hd0
title: Valeriana fonkii Phil.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/sjh-jld-tfp
title: Pilea Lindl.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2420105
title: Role of the local structure on the hydrogen reaction pathway of high entropy alloys

description: Among several materials currently proposed for safe and efficient solid-state hydrogen storage, alloys and intermetallics are some of the most promising candidates due to high volumetric capacities and chemical tuneability. We are currently studying the bcc TiZrNbHfV1-xTax (x = 0, 0.25, 0.5, 0.75 and 1) high entropy alloys forming high-capacity hydrides. Despite the same initial bcc lattice and close chemical composition (80%), the phase transition pathway during the reaction with gaseous H is different: H absorption in the TiZrNbHfV alloy occurs in a one-step reaction directly forming a dihydride, while when V is even partially substituted by Ta in TiZrNbHfV1-xTax that induces a two-step transformation via an intermediate monohydride. It is unclear which parameters influence this phase transformation: electronic properties, local structure, or lattice strain. Thus, we propose to clarify here the local structure in the various deuteride phases in this series of alloys by ex-situ total neutron scattering and associated PDF analysis. This will help in understanding the reaction pathway with hydrogen/deuterium at local level and improving the design of high-capacity materials.
DOI: 10.5286/isis.e.rb2420105-1
title: Role of the local structure on the hydrogen reaction pathway of high entropy alloys

description: Among several materials currently proposed for safe and efficient solid-state hydrogen storage, alloys and intermetallics are some of the most promising candidates due to high volumetric capacities and chemical tuneability. We are currently studying the bcc TiZrNbHfV1-xTax (x = 0, 0.25, 0.5, 0.75 and 1) high entropy alloys forming high-capacity hydrides. Despite the same initial bcc lattice and close chemical composition (80%), the phase transition pathway during the reaction with gaseous H is different: H absorption in the TiZrNbHfV alloy occurs in a one-step reaction directly forming a dihydride, while when V is even partially substituted by Ta in TiZrNbHfV1-xTax that induces a two-step transformation via an intermediate monohydride. It is unclear which parameters influence this phase transformation: electronic properties, local structure, or lattice strain. Thus, we propose to clarify here the local structure in the various deuteride phases in this series of alloys by ex-situ total neutron scattering and associated PDF analysis. This will help in understanding the reaction pathway with hydrogen/deuterium at local level and improving the design of high-capacity materials.
DOI: 10.5286/isis.e.rb2510186-1
title: Crystal field excitations in a triangular-lattice quantum spin liquid material RbNdSe2

description: RbNdSe2 is a new, previously unexplored species of a recently discovered large family of quantum spin liquid candidates with delafossite structure. We propose to use inelastic neutron scattering to study the crystal field excitations and determine the wavefunction of the ground state Kramer’s doublets and the magnetic anisotropy. The results are essential for understanding the novel low-energy spin dynamics due to correlations.
DOI: 10.3535/d2m-xv8-30f
title: Misodendrum punctulatum Sol. ex G. Forst.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/rkw-z5q-mm4
title: Nassauvia dentata Griseb.

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