cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e.rb2310399
title: Understanding Particle Wettability in Light-Responsive Pickering Emulsions

description: This work aims to understand the mode-of-action of an emergent class of stimuli-responsive materials – Light-responsive Pickering emulsions. These are mixtures of oil and water where one phase is dispersed as droplets throughout the bulk phase and the droplet boundary is stabilised by light-responsive solid particles. When light of one wavelength is shone on the particles, the droplets destabilise, releasing their contents. The emulsion reforms on irradiation with light of a different colour and the destabilisation/stabilisation process can be repeated over multiple cycles. This can be exploited for the delivery of drugs in the body, the separation of oil from water and the recovery of catalysts in industrial reactions. The mechanism for this stabilisation/destabilisation process, however, is not well understood. Using small angle neutron scattering, we aim to investigate how the particle structure affects how how they pack at the oil-water boundary and how this is changed in response to light. This will allow us to tune the properties of the emulsions to better suit the varied requirements of the above applications.
DOI: 10.5286/isis.e.rb2310399-1
title: Understanding Particle Wettability in Light-Responsive Pickering Emulsions

description: This work aims to understand the mode-of-action of an emergent class of stimuli-responsive materials – Light-responsive Pickering emulsions. These are mixtures of oil and water where one phase is dispersed as droplets throughout the bulk phase and the droplet boundary is stabilised by light-responsive solid particles. When light of one wavelength is shone on the particles, the droplets destabilise, releasing their contents. The emulsion reforms on irradiation with light of a different colour and the destabilisation/stabilisation process can be repeated over multiple cycles. This can be exploited for the delivery of drugs in the body, the separation of oil from water and the recovery of catalysts in industrial reactions. The mechanism for this stabilisation/destabilisation process, however, is not well understood. Using small angle neutron scattering, we aim to investigate how the particle structure affects how how they pack at the oil-water boundary and how this is changed in response to light. This will allow us to tune the properties of the emulsions to better suit the varied requirements of the above applications.
DOI: 10.3535/v42-knr-grt
title: Cyclachaena xanthiifolia (Nutt.) Fresen.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/ycm-mx3-wbg
title: Cerastium glomeratum Thuill.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220700-1
title: A neutron imaging study of a working catalyst
DOI: 10.5286/isis.e.rb2310694
title: Competitive adsorption of stearyldiethanolamine and oleic acid at the iron oxide-dodecane interface

description: Reducing friction between moving components in engines minimises the fuel consumption and the resulting emissions of gasoline vehicles. The lubrication of sliding surfaces can be improved by the inclusion of organic friction modifier (OFM) additives in engine oils, which adsorb at the engine surfaces and form films that reduce friction. However, their behaviour in the presence of other lubricant additives is poorly understood. In this experiment, the structure of co-adsorbed films of oleic acid and stearyldiethanolamine at the iron oxide-dodecane interface will be investigated using polarised neutron reflectometry. We will characterise the interfacial composition of the OFMs at the interface as a function of the order of introduction to the interface, oleic acid concentration and temperature.
DOI: 10.5286/isis.e.rb2310694-1
title: Competitive adsorption of stearyldiethanolamine and oleic acid at the iron oxide-dodecane interface

description: Reducing friction between moving components in engines minimises the fuel consumption and the resulting emissions of gasoline vehicles. The lubrication of sliding surfaces can be improved by the inclusion of organic friction modifier (OFM) additives in engine oils, which adsorb at the engine surfaces and form films that reduce friction. However, their behaviour in the presence of other lubricant additives is poorly understood. In this experiment, the structure of co-adsorbed films of oleic acid and stearyldiethanolamine at the iron oxide-dodecane interface will be investigated using polarised neutron reflectometry. We will characterise the interfacial composition of the OFMs at the interface as a function of the order of introduction to the interface, oleic acid concentration and temperature.
DOI: 10.3535/gs0-cdj-5pt
title: Rhagadiolus stellatus (L.) Gaertn.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/hn9-g01-ypy
title: Carex rostrata var. rostrata

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220700
title: A neutron imaging study of a working catalyst
DOI: 10.5286/isis.e.rb2310199
title: Investigation of the ground-state magnetic structure of a novel triangular-lattice antiferromagnet Na2SrCo(PO4)2

description: Recently, Na2SrCo(PO4)2 (NSCPO), a novel spin-1/2 triangular-lattice antiferromagnet (TLAF) with a monoclinically distorted structure and an antiferromagnetic order at 600 mK, is synthesized. Due to the distortion of the in-plane triangular lattice and its low crystallographic symmetry, the off-diagonal symmetric exchange interaction, pseudo-dipolar exchange interaction and Dzyaloshinskii-Moriya interaction are found to be all present, in addition to the dominant Heisenberg XXZ model. This is in stark contrast to other triangular-lattice cobaltates, which are all nearly ideal Heisenberg TLAFs well described by the XXZ model alone. NSCPO, therefore, is a rare example in the triangular-lattice cobaltates showing a significant magnetic anisotropy and call for more attentions. Based on the microscopic model description of this material with realistic model parameters, the ground-state magnetic structure of NSCPO is calculated by density matrix renormalization group (DMRG) method. A stripe-like order with k= (1/2, 1/2, 0) is predicted as its magnetic ground state, awaiting the experimental verification. We propose to perform neutron powder diffraction experiment on NSCPO to verify the theoretical prediction and the correctness of the model parameters.
DOI: 10.5286/isis.e.rb2310199-1
title: Investigation of the ground-state magnetic structure of a novel triangular-lattice antiferromagnet Na2SrCo(PO4)2

description: Recently, Na2SrCo(PO4)2 (NSCPO), a novel spin-1/2 triangular-lattice antiferromagnet (TLAF) with a monoclinically distorted structure and an antiferromagnetic order at 600 mK, is synthesized. Due to the distortion of the in-plane triangular lattice and its low crystallographic symmetry, the off-diagonal symmetric exchange interaction, pseudo-dipolar exchange interaction and Dzyaloshinskii-Moriya interaction are found to be all present, in addition to the dominant Heisenberg XXZ model. This is in stark contrast to other triangular-lattice cobaltates, which are all nearly ideal Heisenberg TLAFs well described by the XXZ model alone. NSCPO, therefore, is a rare example in the triangular-lattice cobaltates showing a significant magnetic anisotropy and call for more attentions. Based on the microscopic model description of this material with realistic model parameters, the ground-state magnetic structure of NSCPO is calculated by density matrix renormalization group (DMRG) method. A stripe-like order with k= (1/2, 1/2, 0) is predicted as its magnetic ground state, awaiting the experimental verification. We propose to perform neutron powder diffraction experiment on NSCPO to verify the theoretical prediction and the correctness of the model parameters.
DOI: 10.3535/bvv-sqr-cpp
title: Liliaceae

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/lsm-dwj-ee2
title: Anthyllis circinnata (L.) D.D.Sokoloff

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220707-1
title: Superconducting Ground state Studies of Equiatomic High Entropy Alloy
DOI: 10.5286/isis.e.rb2310559
title: Powder Neutron Diffraction studies of Ca1-xDyxBaFe4O7 (x &lt;= 0.03)

description: Recent studies of CaBaFe4O7 highlight the attractive functional properties of these materials such as gigantic electric polarization, large magnetization and strong magnetoelectric coupling. These are also fundamentally important because of competing magnetic interactions due to geometrical frustration in the alternately arranged two dimensional kagomé and triangular layers of Fe tetrahedra. This proposal concentrates on the study of Dy-doped CaBaFe4O7 that show drastic changes in the magnetic ground state upon only a slight doping of 1 – 3% at the Ca site. The transition temperature of 3% doped sample shifts to 385 K from 274 K which is substantiated by a neutron powder diffraction data at room temperature revealing a magnetic structure different from the parent compound. In order to completely investigate the effects of this doping on the magnetic structure, we propose neutron powder diffraction studies at various temperatures. The aim is to clearly point out the nature of magnetism and the origin of magnetoelectric coupling.
DOI: 10.5286/isis.e.rb2310559-1
title: Powder Neutron Diffraction studies of Ca1-xDyxBaFe4O7 (x &lt;= 0.03)

description: Recent studies of CaBaFe4O7 highlight the attractive functional properties of these materials such as gigantic electric polarization, large magnetization and strong magnetoelectric coupling. These are also fundamentally important because of competing magnetic interactions due to geometrical frustration in the alternately arranged two dimensional kagomé and triangular layers of Fe tetrahedra. This proposal concentrates on the study of Dy-doped CaBaFe4O7 that show drastic changes in the magnetic ground state upon only a slight doping of 1 – 3% at the Ca site. The transition temperature of 3% doped sample shifts to 385 K from 274 K which is substantiated by a neutron powder diffraction data at room temperature revealing a magnetic structure different from the parent compound. In order to completely investigate the effects of this doping on the magnetic structure, we propose neutron powder diffraction studies at various temperatures. The aim is to clearly point out the nature of magnetism and the origin of magnetoelectric coupling.
DOI: 10.3535/5t5-n57-20d
title: Sparganium × speirocephalum Neuman

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220707
title: Superconducting Ground state Studies of Equiatomic High Entropy Alloy
DOI: 10.5286/isis.e.rb2310554
title: Fusion mechanisms of asymmetric lipid vesicles and membranes mimicking the cell wall and endosome

description: Communication and transfer of material between cells is a fundamental process in cell biology. Nature uses vesicles for such cell-to-cell communication in the form of extracellular vesicles (EVs). EVs are innately biocompatible and have huge potential in therapeutics and diagnostics, thanks in part to the fact that they possess many functionally relevant moieties including nucleic acid cargoes, proteins, and surface receptors, whose roles in EV activity and biodistribution have been well studied. However, less is known about the role of the lipids, although it is has been shown that EV populations have significantly different lipid distributions depending on cell line and biogenesis. The uptake of EVs and other lipid particles is widely accepted as varying across cell types. While this is in part due to surface markers, it is also due to the lipid composition. In my group we are developing vesicles with asymmetric distribution of lipids across the membrane, which mimic the lipid compositions found in EVs. These synthetic asymmetric vesicles will allow us to decouple the role of lipids in such biological processes. In this experiment, we will use DNA to tether these asymmetric vesicles to the surface of free-floating lipid bilayers representing lipid compositions of cell membranes and intracellular compartments, and study their fusion processes.
DOI: 10.5286/isis.e.rb2310554-1
title: Fusion mechanisms of asymmetric lipid vesicles and membranes mimicking the cell wall and endosome

description: Communication and transfer of material between cells is a fundamental process in cell biology. Nature uses vesicles for such cell-to-cell communication in the form of extracellular vesicles (EVs). EVs are innately biocompatible and have huge potential in therapeutics and diagnostics, thanks in part to the fact that they possess many functionally relevant moieties including nucleic acid cargoes, proteins, and surface receptors, whose roles in EV activity and biodistribution have been well studied. However, less is known about the role of the lipids, although it is has been shown that EV populations have significantly different lipid distributions depending on cell line and biogenesis. The uptake of EVs and other lipid particles is widely accepted as varying across cell types. While this is in part due to surface markers, it is also due to the lipid composition. In my group we are developing vesicles with asymmetric distribution of lipids across the membrane, which mimic the lipid compositions found in EVs. These synthetic asymmetric vesicles will allow us to decouple the role of lipids in such biological processes. In this experiment, we will use DNA to tether these asymmetric vesicles to the surface of free-floating lipid bilayers representing lipid compositions of cell membranes and intracellular compartments, and study their fusion processes.
DOI: 10.3535/537-hv3-bbk
title: Phyteuma nigrum F.W.Schmidt

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/twx-81j-eqc
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.rb2310037
title: Spin excitations underlying the 1/3 magnetization plateau phase of a spin-1 Kitaev honeycomb candidate

description: In our previous work, we unveiled an unprecedented robust 1/3 magnetization plateau phase in a genuine honeycomb lattice without geometrical frustration. By carrying out elastic neutron scattering measurement, we have pinned down the unusual partial-spin-flop magnetic structure responsible for the 1/3 plateau phase. By summarizing the magnetometry data and neutron results, we establish a magnetic phase diagram for Na3Ni2BiO6 (NNBO). Our results strongly suggest that the presence of bond-dependent Kitaev interactions in NNBO is very likely but spectroscopic evidence is still lacking. Although we have found the highly anisotropic spin waves in zero field consistent with the conjecture of the presence of the Kitaev interactions, little is known about the excitation spectra in plateau phase. Furthermore, applying a magnetic field that fully polarizes the system and studying the excitation spectra from which one can extract the exchange parameters is equally important. Therefore, high-field studies on the 1/3 plateau and fully polarized state in the magnet are urgently desired.
DOI: 10.5286/isis.e.rb2310037-2
title: Spin excitations underlying the 1/3 magnetization plateau phase of a spin-1 Kitaev honeycomb candidate

description: In our previous work, we unveiled an unprecedented robust 1/3 magnetization plateau phase in a genuine honeycomb lattice without geometrical frustration. By carrying out elastic neutron scattering measurement, we have pinned down the unusual partial-spin-flop magnetic structure responsible for the 1/3 plateau phase. By summarizing the magnetometry data and neutron results, we establish a magnetic phase diagram for Na3Ni2BiO6 (NNBO). Our results strongly suggest that the presence of bond-dependent Kitaev interactions in NNBO is very likely but spectroscopic evidence is still lacking. Although we have found the highly anisotropic spin waves in zero field consistent with the conjecture of the presence of the Kitaev interactions, little is known about the excitation spectra in plateau phase. Furthermore, applying a magnetic field that fully polarizes the system and studying the excitation spectra from which one can extract the exchange parameters is equally important. Therefore, high-field studies on the 1/3 plateau and fully polarized state in the magnet are urgently desired.
DOI: 10.3535/f4h-k5q-7bx
title: Centaurea diffusa Lam.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/vz9-fsa-ap5
title: Jacquinia cristalensis Lepper & J. E. Gut.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2310043-1
title: Elucidating the interactions between membrane-bound and membraneless organelles using SANS analysis of minimalistic peptide and lipid model systems

description: Cell nucleus contains membrane-bound and membraneless subcellular organelles that accommodate and control biocatalytic processes. Their structures and functions are poorly characterised. Despite recent progress in elucidating the mechanism of membraneless organelles formation by liquid-liquid phase separation1 (LLPS) of intrinsically disordered proteins, the interaction between protein-based organelles and lipid membrane-bound organelles remains unknown. This work follows our recent advances in the models of the two entities using small designed peptides and lipid vesicles, we propose to study how the two model organelles interact across the model interface when they are brought together. The parallel SANS runs under H/D substitutions offer great potential for unraveling the key molecular structural features from representative short peptides and environmental conditions.
DOI: 10.5286/isis.e.rb2310569
title: Combined SANS, UV and Fluorescence to Resolve Assembly Mechanisms in Recombinant Cylindriform Silk

description: Despite the many uses of spider silk, spanning textile and biomedical industries, there is still a limited understanding of how this chemical and structural complex material is formed, consequently limiting its societal benefits potential. Specifically, the lack of knowledge in the fibrillation process of the cylindriform silk (α → β), a low energy rapidly spun silk (which forms a spider’s egg casing) compared to the well-studied dragline (safety line) silk. Therefore, we aim to investigate cylindriform silk’s unique alpha-to-beta transition. The multimodal platform at Larmor called NUrF (simultaneous combination of Neutron small-angle scattering, UV-visible, and Fluorescence) will be used to monitor and resolve the structural intermediates involved in the fibrillation of recombinant cylindriform silk. In doing so, we will elucidate the mechanisms and molecular basis for fibre assembly, with the final aim of mimicking the signature properties of silk in biomaterials and protein-based foods.
DOI: 10.5286/isis.e.rb2310569-1
title: Combined SANS, UV and Fluorescence to Resolve Assembly Mechanisms in Recombinant Cylindriform Silk

description: Despite the many uses of spider silk, spanning textile and biomedical industries, there is still a limited understanding of how this chemical and structural complex material is formed, consequently limiting its societal benefits potential. Specifically, the lack of knowledge in the fibrillation process of the cylindriform silk (α → β), a low energy rapidly spun silk (which forms a spider’s egg casing) compared to the well-studied dragline (safety line) silk. Therefore, we aim to investigate cylindriform silk’s unique alpha-to-beta transition. The multimodal platform at Larmor called NUrF (simultaneous combination of Neutron small-angle scattering, UV-visible, and Fluorescence) will be used to monitor and resolve the structural intermediates involved in the fibrillation of recombinant cylindriform silk. In doing so, we will elucidate the mechanisms and molecular basis for fibre assembly, with the final aim of mimicking the signature properties of silk in biomaterials and protein-based foods.
DOI: 10.3535/9zq-ypa-x6y
title: Scabiosa canescens Waldst. & Kit.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/x50-ltc-evw
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.rb2310043
title: Elucidating the interactions between membrane-bound and membraneless organelles using SANS analysis of minimalistic peptide and lipid model systems

description: Cell nucleus contains membrane-bound and membraneless subcellular organelles that accommodate and control biocatalytic processes. Their structures and functions are poorly characterised. Despite recent progress in elucidating the mechanism of membraneless organelles formation by liquid-liquid phase separation1 (LLPS) of intrinsically disordered proteins, the interaction between protein-based organelles and lipid membrane-bound organelles remains unknown. This work follows our recent advances in the models of the two entities using small designed peptides and lipid vesicles, we propose to study how the two model organelles interact across the model interface when they are brought together. The parallel SANS runs under H/D substitutions offer great potential for unraveling the key molecular structural features from representative short peptides and environmental conditions.
DOI: 10.5286/isis.e.rb2310254
title: Crystal and magnetic structures of the high pressure RMnMnReO6 (R = La, Pr) double double perovskites

description: We have recently discovered a new RMnMnReO6 series of double double perovskites; they are of particular interest for magnetic properties as they contain magnetic cations at all four of the AA’BB’O6 sites (when R3+ is magnetic). The R = Nd material was discovered first and has recently been studied at WISH (RB2220431). We have synthesised two new RMnMnReO6 (R = La, Pr) materials that are proposed for study here. The magnetic susceptibilities of RMnMnReO6 (R = La, Pr) show ferrimagnetic transitions at ~135 K for R = La and at ~225 K for R = Pr, and further investigation on R = Pr using AC susceptibility clearly indicates successive magnetic transitions at 60, 160, and 225 K. Neutron diffraction is necessary to investigate the crystal and magnetic structures of these double double perovskites. With time for temperature changes and sample equilibration, as well as considering the small amounts of sample available (100 mg each, combining several batches from high-pressure synthesis), 3 days of beamtime are requested at WISH.