cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e.rb2210048
title: Spin-density wave dynamics in a 2D distorted triangular lattice antiferromagnet

description: Insulating spin systems on distorted triangular lattices represent a point of contact between the 1D physics of spin chains and that of 2D frustrated triangular magnets. Quantum fluctuations in these systems stabilize exotic phases in applied magnetic field, like 1/3 plateaux and incommensurate spin-density waves (SDW). The latter has been recently observed in 1D chains, but it is predicted to survive in particular 2D distorted lattices. However, experimental realizations in 2D systems still lack. Moreover, the dynamics of these states in 2D remain unclear. Cs2CoBr4 allows to tackle these questions experimentally. Neutron diffraction revealed the presence of 1/3 magnetization plateau and an incommensurate SDW in its phase diagram. We also succeeded in growing large single crystals. Therefore, Cs2CoBr4 offers the unique possibility to study SDW dynamics in a 2D distorted lattice system.
DOI: 10.5286/isis.e.rb2210048-1
title: Spin-density wave dynamics in a 2D distorted triangular lattice antiferromagnet

description: Insulating spin systems on distorted triangular lattices represent a point of contact between the 1D physics of spin chains and that of 2D frustrated triangular magnets. Quantum fluctuations in these systems stabilize exotic phases in applied magnetic field, like 1/3 plateaux and incommensurate spin-density waves (SDW). The latter has been recently observed in 1D chains, but it is predicted to survive in particular 2D distorted lattices. However, experimental realizations in 2D systems still lack. Moreover, the dynamics of these states in 2D remain unclear. Cs2CoBr4 allows to tackle these questions experimentally. Neutron diffraction revealed the presence of 1/3 magnetization plateau and an incommensurate SDW in its phase diagram. We also succeeded in growing large single crystals. Therefore, Cs2CoBr4 offers the unique possibility to study SDW dynamics in a 2D distorted lattice system.
DOI: 10.3535/b85-yar-gg5
title: Lasianthus lanceolatus (Griseb.) Urb.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/hkj-phz-8sh
title: Amaranthus spinosus L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2210068
title: Evolution of the interface magnetism in bi-magnetic core/shell nanoparticles (Fe3O4/Mn3O4) with antiferromagnetic interface coupling

description: Bi-magnetic core/shell nanoparticles with an antiferromagnetic interface present very interesting properties. At high fields the antiferromagnetic coupling is overcome and the shell magnetization rotates so that the core and the shell align ferromagnetically. Simulations show that this induces an inhomogeneous magnetization at the interface. Here we propose to carry out a half-polarized SANS study of Fe3O4/Mn3O4 core/shell nanoparticles with antiferromagnetic interface coupling at different fields. (0-3 T) at 100 K and 10 K [TC(Mn3O4)=45 K]. The results will allow us to study the evolution of the spin arrangement of the core, shell and interface as the magnetization of the shell rotates for increasing fields. These results will allow us to understand the microscopic effects of the antiferromagnetic interface coupling in core/shell nanoparticles.
DOI: 10.5286/isis.e.rb2210068-1
title: Evolution of the interface magnetism in bi-magnetic core/shell nanoparticles (Fe3O4/Mn3O4) with antiferromagnetic interface coupling

description: Bi-magnetic core/shell nanoparticles with an antiferromagnetic interface present very interesting properties. At high fields the antiferromagnetic coupling is overcome and the shell magnetization rotates so that the core and the shell align ferromagnetically. Simulations show that this induces an inhomogeneous magnetization at the interface. Here we propose to carry out a half-polarized SANS study of Fe3O4/Mn3O4 core/shell nanoparticles with antiferromagnetic interface coupling at different fields. (0-3 T) at 100 K and 10 K [TC(Mn3O4)=45 K]. The results will allow us to study the evolution of the spin arrangement of the core, shell and interface as the magnetization of the shell rotates for increasing fields. These results will allow us to understand the microscopic effects of the antiferromagnetic interface coupling in core/shell nanoparticles.
DOI: 10.5286/isis.e.rb2210195
title: Investigating the gas-liquid interface in models of supported ionic liquid phases (SILPs)

description: SILPs, formed of thin films of ILs on porous supports such as Al2O3, are becoming important in industrial catalysis. However, the fundamental nature of the gas-liquid interface in SILPs, and how this evolves during catalysis, is poorly understood. It is proposed to use neutron reflectivity (NR) to complete studies into the surface composition and structure of ILs and IL thin films of relevance to SILP catalysis that were started in RB1920598. Once characterised, the effects of time on stream during the water-gas shift reaction, an important application for SILPs, will be studied by exposing the ILs to atmospheres of known humidity. The experiments will provide much needed insight into the interfacial structure of SILPs and investigate whether surface-active IL ions could be used to modify SILP surfaces and catalytic performance.
DOI: 10.3535/dq5-a6v-bp5
title: Euphorbiaceae

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/vrk-030-9lk
title: Palicourea toensis (Britton & P.Wilson) Standl.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2210033
title: The structure of THF-water mixtures and clathrates in nanoscale confinement

description: Tetrahydrofuran (THF) is a small organic molecule in which four carbon atoms are joined together by an oxygen atom to form a ring (https://en.wikipedia.org/wiki/Tetrahydrofuran). THF is a liquid at room temperature and is extremely valuable as an industrial solvent, for example in processing polyvinyl chloride (PVC) and 3D printing. THF itself dissolves in water, to form mixtures that are used in the liquefaction of plant-based biomass and formation of biofuels. In addition, at 4C and below, THF-water mixtures freeze to form cage-based crystals in the same family as the methane-hydrates found undersea and in arctic tundra. In this proposal we aim to understand the behaviour of these fascinating and versatile THF-water mixtures by measuring their structure (molecular arrangements) under a range of different conditions, and when confined to very small (nanometer-scale) pores.
DOI: 10.5286/isis.e.rb2210033-1
title: The structure of THF-water mixtures and clathrates in nanoscale confinement

description: Tetrahydrofuran (THF) is a small organic molecule in which four carbon atoms are joined together by an oxygen atom to form a ring (https://en.wikipedia.org/wiki/Tetrahydrofuran). THF is a liquid at room temperature and is extremely valuable as an industrial solvent, for example in processing polyvinyl chloride (PVC) and 3D printing. THF itself dissolves in water, to form mixtures that are used in the liquefaction of plant-based biomass and formation of biofuels. In addition, at 4C and below, THF-water mixtures freeze to form cage-based crystals in the same family as the methane-hydrates found undersea and in arctic tundra. In this proposal we aim to understand the behaviour of these fascinating and versatile THF-water mixtures by measuring their structure (molecular arrangements) under a range of different conditions, and when confined to very small (nanometer-scale) pores.
DOI: 10.5286/isis.e.rb2210195-1
title: Investigating the gas-liquid interface in models of supported ionic liquid phases (SILPs)

description: SILPs, formed of thin films of ILs on porous supports such as Al2O3, are becoming important in industrial catalysis. However, the fundamental nature of the gas-liquid interface in SILPs, and how this evolves during catalysis, is poorly understood. It is proposed to use neutron reflectivity (NR) to complete studies into the surface composition and structure of ILs and IL thin films of relevance to SILP catalysis that were started in RB1920598. Once characterised, the effects of time on stream during the water-gas shift reaction, an important application for SILPs, will be studied by exposing the ILs to atmospheres of known humidity. The experiments will provide much needed insight into the interfacial structure of SILPs and investigate whether surface-active IL ions could be used to modify SILP surfaces and catalytic performance.
DOI: 10.3535/1nb-q36-ncr
title: Brya subinermis León & Alain

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2210042
title: Structural studies of integral membrane proteins in Salipro stealth carriers

description: Integral membrane proteins (IMPs) are potential targets for medical applications and are usually extracted with detergent for structural studies. However, SAXS and SANS studies of membrane proteins in detergent micelles are problematic due to the dominating contribution of detergent and empty micelles. Reconstitution of IMPs in Salipro nanoparticles can overcome these obstacles and allow a low-resolution structural analysis of membrane proteins in a detergent free environment. To fully contrast-match out the Salipro nanoparticles, we plan to incorporate our IMP targets in stealth carriers consisting of deuterated Saposin A proteins and lipids and perform a SANS experiment on SANS2D. This would allow a low-resolution structural characterisation of our IMPs of interest in a native-like lipid environment without the often-dominating scattering contribution of the lipid carrier system.
DOI: 10.5286/isis.e.rb2210042-1
title: Structural studies of integral membrane proteins in Salipro stealth carriers

description: Integral membrane proteins (IMPs) are potential targets for medical applications and are usually extracted with detergent for structural studies. However, SAXS and SANS studies of membrane proteins in detergent micelles are problematic due to the dominating contribution of detergent and empty micelles. Reconstitution of IMPs in Salipro nanoparticles can overcome these obstacles and allow a low-resolution structural analysis of membrane proteins in a detergent free environment. To fully contrast-match out the Salipro nanoparticles, we plan to incorporate our IMP targets in stealth carriers consisting of deuterated Saposin A proteins and lipids and perform a SANS experiment on SANS2D. This would allow a low-resolution structural characterisation of our IMPs of interest in a native-like lipid environment without the often-dominating scattering contribution of the lipid carrier system.
DOI: 10.5286/isis.e.rb2210192
title: New low surface energy surfactants at oil-water interfaces

description: Despite their super efficiency and industrial relevancy, severe environmental and human-health threats of fluorinated surfactants (FSURFS) are apparent1,2. Dichain trimethylsilyl (TMS) hedgehog surfactants (Figure 1) are credible replacements for FSURFS as chemically stable, environmentally benign super-efficient 21st century surfactants3. The aqueous aggregation and surface properties of TMS-hedgehogs have been explored3; however, their role in stabilizing liquid-liquid interfaces (i.e. emulsifiers) is very little studied. Contrast-variation SANS experiments are proposed here in order to understand structure-performance relationships of TMS hedgehog-films at typical oil-water interfaces - using water-in-oil (W/O) microemulsions (μEs) as model systems.
DOI: 10.3535/15m-zk6-a7n
title: Lundinia plumbea (Griseb.) B. Nord.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/dy4-ylh-xtf
title: Chionanthus domingensis Lam.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2210086
title: Dispersion of E8 particles in the spin-1/2 antiferromagnetic XXZ chain BaCo2V2O8 in a transverse magnetic field

description: The one-dimensional spin-1/2 antiferromagnetic with Heisenberg-Ising (XXZ) anisotropy is a great model system to explore fundamental physics concepts. In zero applied magnetic field, it hosts spinon excitations which are confined into pairs by interchain coupling and in a longitudinal magnetic field it enters a critical regime known as a Tomonaga-Luttinger Liquid characterised by Bethe string excitations. These features have been explored using the compounds BaCo2V2O8 and SrCo2V2O8. In BaCo2V2O8 a transverse magnetic field has also been found to also suppress the antiferromagnetic order and induce a one-dimensional quantum critical point classified by the exceptional E8 Lie algebra which is characterized by 8 gapped excitations (massive particles). Here we propose to explore the dispersion of the E8 particles in BaCo2V2O8 and make comparison to recent theories.
DOI: 10.5286/isis.e.rb2210086-1
title: Dispersion of E8 particles in the spin-1/2 antiferromagnetic XXZ chain BaCo2V2O8 in a transverse magnetic field

description: The one-dimensional spin-1/2 antiferromagnetic with Heisenberg-Ising (XXZ) anisotropy is a great model system to explore fundamental physics concepts. In zero applied magnetic field, it hosts spinon excitations which are confined into pairs by interchain coupling and in a longitudinal magnetic field it enters a critical regime known as a Tomonaga-Luttinger Liquid characterised by Bethe string excitations. These features have been explored using the compounds BaCo2V2O8 and SrCo2V2O8. In BaCo2V2O8 a transverse magnetic field has also been found to also suppress the antiferromagnetic order and induce a one-dimensional quantum critical point classified by the exceptional E8 Lie algebra which is characterized by 8 gapped excitations (massive particles). Here we propose to explore the dispersion of the E8 particles in BaCo2V2O8 and make comparison to recent theories.
DOI: 10.5286/isis.e.rb2210192-1
title: New low surface energy surfactants at oil-water interfaces

description: Despite their super efficiency and industrial relevancy, severe environmental and human-health threats of fluorinated surfactants (FSURFS) are apparent1,2. Dichain trimethylsilyl (TMS) hedgehog surfactants (Figure 1) are credible replacements for FSURFS as chemically stable, environmentally benign super-efficient 21st century surfactants3. The aqueous aggregation and surface properties of TMS-hedgehogs have been explored3; however, their role in stabilizing liquid-liquid interfaces (i.e. emulsifiers) is very little studied. Contrast-variation SANS experiments are proposed here in order to understand structure-performance relationships of TMS hedgehog-films at typical oil-water interfaces - using water-in-oil (W/O) microemulsions (μEs) as model systems.
DOI: 10.3535/5e9-vvz-nmp
title: Clitoria falcata var. falcata

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/fg9-q6t-2bh
title: Arthrostylidium fimbriatum Griseb.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2210180
title: Molecular Architecture of Lipid Nanoparticles using SANS

description: Lipid nanoparticles (LNPs) are composed of a mixture of a cationic ionisable lipid, distearoylphosphatidylcholine (DSPC), cholesterol, and a PEG-lipid. Significantly, LNPs are increasingly being investigated as a means to deliver RNA, partially because of their use as the vehicle used to deliver the mRNA in the COVID-19 vaccines produced by Moderna and Pfizer/Biontech [1]. While lipid nanoparticles (LNPs) are approved in use for RNA delivery, the speed of their development and subsequent regulatory approval has meant that there has been no time to optimise the properties of the LNPs. To better understand how the LNPs deliver nucleic acid, it is important to determine the detailed molecular architecture of the LNPs to understand the interactions of the lipids comprising the LNPs with their nucleic acid cargo, this will be achieved here using contrast variation SANS.
DOI: 10.5286/isis.e.rb2210180-1
title: Molecular Architecture of Lipid Nanoparticles using SANS

description: Lipid nanoparticles (LNPs) are composed of a mixture of a cationic ionisable lipid, distearoylphosphatidylcholine (DSPC), cholesterol, and a PEG-lipid. Significantly, LNPs are increasingly being investigated as a means to deliver RNA, partially because of their use as the vehicle used to deliver the mRNA in the COVID-19 vaccines produced by Moderna and Pfizer/Biontech [1]. While lipid nanoparticles (LNPs) are approved in use for RNA delivery, the speed of their development and subsequent regulatory approval has meant that there has been no time to optimise the properties of the LNPs. To better understand how the LNPs deliver nucleic acid, it is important to determine the detailed molecular architecture of the LNPs to understand the interactions of the lipids comprising the LNPs with their nucleic acid cargo, this will be achieved here using contrast variation SANS.
DOI: 10.3535/4wv-f83-dm3
title: Lepidaploa (Cass.) Cass.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2200003
title: Exotic magnetism in the topological semimetal candidate Dy3Sn7.

description: Topological materials are those with unconventional properties robust to deformation and perturbation. Among them, of much recent interest are so-called topological semimetals (TSMs), which possess high charge carrier mobilities and may host quasiparticles analogous to those studied in high-energy physics. The presence of magnetic ordering within a TSM is expected to lead to a variety of exotic physical phenomena, however such materials are rare. We have established the intermetallic compound Dy3Sn7 as a potential magnetic TSM. Our data show that Dy3Sn7 displays high carrier mobilities and low effective masses at low temperatures, both characteristic features of a TSM. Importantly, Dy3Sn7 orders magnetically below 20 K. Therefore, we seek to use WISH to determine the magnetic structure of Dy3Sn7 below 20 K in order to better understand the interplay between topology and magnetism.
DOI: 10.5286/isis.e.rb2200003-1
title: Exotic magnetism in the topological semimetal candidate Dy3Sn7.

description: Topological materials are those with unconventional properties robust to deformation and perturbation. Among them, of much recent interest are so-called topological semimetals (TSMs), which possess high charge carrier mobilities and may host quasiparticles analogous to those studied in high-energy physics. The presence of magnetic ordering within a TSM is expected to lead to a variety of exotic physical phenomena, however such materials are rare. We have established the intermetallic compound Dy3Sn7 as a potential magnetic TSM. Our data show that Dy3Sn7 displays high carrier mobilities and low effective masses at low temperatures, both characteristic features of a TSM. Importantly, Dy3Sn7 orders magnetically below 20 K. Therefore, we seek to use WISH to determine the magnetic structure of Dy3Sn7 below 20 K in order to better understand the interplay between topology and magnetism.
DOI: 10.5286/isis.e.rb2210198-2
title: Interaction of model phospholipid bilayer membranes with Extracellular vesicles

description: Extracellular Vesicles (EVs)-mediated intercellular communication is recently receiving a rising attention. Owing to their content, EVs can target cargoes to promote beneficial or pathological conditions. However, understanding the mechanisms by which EVs interact with target cells is still a challenge. We address this by a multi-technique approach, using model membranes of different compositions. We isolated EVs from N2a cells in normal conditions and treated with the oligosaccharide OligoGM1, which is known for its neurotrophic/protective functions in the frame of Parkinson’s disease. Those 2 types of EVs were characterised by Western Blotting, DLS, NTA, AFM and DSC and have been found to have different chemico-physical characteristics. We propose here the use of NR for acquiring structural information on their detailed membrane profiles and interaction with target membrane models.
DOI: 10.3535/696-988-bhn
title: Tabebuia moaensis Britton

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/9jl-e1q-9k1
title: Gordonia moaensis (Vict.) H. Keng

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2210158
title: Investigation of putative multi-k magnetic structure in Ce3TiSb5

description: Ce3TiSb5 belongs to the material class of frustrated Kondo-lattice systems, in which the combination of geometrical frustration and Kondo screening can display quantum critical behavior. Recent studies revealed a complex magnetic phase diagram of Ce3TiSb5 with a number of successive transitions that are currently not understood. Notably, the compound features reentrant magnetic behavior: it has a magnetically ordered state that becomes disordered upon cooling. Our unpublished diffraction data at the thermal single-crystal diffractometer ZEBRA, at PSI, indicate the existence of possible multi-k structures that may have a non-trivial topology. However, the data are not conclusive on the multi-k nature of the structures. With this proposal, we aim to determine the magnetic structure in each of the phases and clarify the underlying mechanism, which leads to this reentrant behavior.
DOI: 10.5286/isis.e.rb2210158-1
title: Investigation of putative multi-k magnetic structure in Ce3TiSb5

description: Ce3TiSb5 belongs to the material class of frustrated Kondo-lattice systems, in which the combination of geometrical frustration and Kondo screening can display quantum critical behavior. Recent studies revealed a complex magnetic phase diagram of Ce3TiSb5 with a number of successive transitions that are currently not understood. Notably, the compound features reentrant magnetic behavior: it has a magnetically ordered state that becomes disordered upon cooling. Our unpublished diffraction data at the thermal single-crystal diffractometer ZEBRA, at PSI, indicate the existence of possible multi-k structures that may have a non-trivial topology. However, the data are not conclusive on the multi-k nature of the structures. With this proposal, we aim to determine the magnetic structure in each of the phases and clarify the underlying mechanism, which leads to this reentrant behavior.
DOI: 10.5286/isis.e.rb2210219-3
title: Magnetic ground states of staggered and chiral integer-spin chains

description: We plan to study two spin-1 antiferromagnets, where the Ni(II) ions are connected in (i) a staggered and (ii) chiral-chain structure. Previous studies of similar spin-1/2 Cu(II) systems revealed a host of interesting magnetic properties, such as a magnetic-field-induced energy gap and family of exotic excitations that map on to the soliton and breather modes of the sine-Gordon equation. Spin-1 chains, however, are known to differ fundamentally from their spin-1/2 counterparts, and the structure of these materials suggests the presence of an unusual, alternating single-ion anisotropy, which adds further complexity to the magnetism. Muon-spin relaxation measurements show that the materials adopt an ordered magnetic structure below T = 2.3 K and 2.2 K. We propose to use neutron diffraction to determine the ordered magnetic structures in advance of measurements of the excitation spectra.
DOI: 10.3535/898-hhe-zja
title: Miconia crenata (Vahl) Michelang.

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