cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e.rb2220338-1
title: The influence of cholesterol on the ability of ionisable cationic lipid to interact with nucleic acid in lipid nanoparticles

description: Lipid nanoparticles (LNPs) are increasingly being used to deliver nucleic acids and have reached world-wide prominence as the delivery vehicle for the COVID-19 vaccines produced by Moderna and Pfizer/Biontech. Yet few, if any, studies have examined the driving force for LNP self-assembly and, in particular, the structures formed as a result of the interaction of their nucleic acid cargo with the ionisable cationic lipid, MC3, and cholesterol, the components believed to comprise the interior of the LNPs. Preliminary surface pressure-area isotherms have shown strong effects of MC3 monolayers without/with cholesterol with nucleic acid in the subphase. The present study will exploit neutron reflectivity measurements on FIGARO to understand the effect of the helper lipid cholesterol on the ability of the MC3 lipid to interact with nucleic acid polyA.
DOI: 10.5286/isis.e.rb2220727-1
title: Understanding the magnetoresistance of a ferromagnetic metal-semiconductor bilayer

description: Spintronic devices using insulating materials offer new advantages for low-power information technologies. A potential material for such proof-of-principle devices is ferromagnetic EuS, which in contact with conducting ferromagnetic permalloy (Py) exhibits an intriguing multi-level magnetoresistance. There is evidence to suggest that this effect originates from a non-collinear alignment of the magnetisation in the two ferromagnetic layers. To obtain insight to the magnetoelectric behaviour and to find potential pathways for device optimisation, we aim to use polarised neutron reflectometry with polarisation analysis to determine the in-plane canting angle between the magnetisation in the EuS and the Py layers. By measuring this canting we can obtain coupling constants that further describe the complex longitudinal and transverse magnetoresistive response we observe in EuS|Py devices.
DOI: 10.3535/bba-hmp-rbv
title: Lathyrus oleraceus Lam.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/fnz-des-etb
title: Rosa arvensis Huds.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220727
title: Understanding the magnetoresistance of a ferromagnetic metal-semiconductor bilayer

description: Spintronic devices using insulating materials offer new advantages for low-power information technologies. A potential material for such proof-of-principle devices is ferromagnetic EuS, which in contact with conducting ferromagnetic permalloy (Py) exhibits an intriguing multi-level magnetoresistance. There is evidence to suggest that this effect originates from a non-collinear alignment of the magnetisation in the two ferromagnetic layers. To obtain insight to the magnetoelectric behaviour and to find potential pathways for device optimisation, we aim to use polarised neutron reflectometry with polarisation analysis to determine the in-plane canting angle between the magnetisation in the EuS and the Py layers. By measuring this canting we can obtain coupling constants that further describe the complex longitudinal and transverse magnetoresistive response we observe in EuS|Py devices.
DOI: 10.5286/isis.e.rb2220774
title: Investigation of Hydrogel Architecture Constructed from the Strongest Protein Fold

description: Proteins are bionanomachines and provide a diverse range of biological functions. By using folded proteins as building blocks, we can create functional biomaterials with specific mechanical and structural properties. An exciting new building block is the staphylococcal adhesin B domain (SdrG B1) which holds the position of being the strongest ever protein to date. The mechanical properties of this protein are sensitive to calcium in the environment, making it an attractive mechanically robust and responsive building block. In this project we will obtain important structural insight into the network which is formed by connected SdrG B1 proteins. This will help us to understand the mechanically robust scaffold created by the protein network and how it changes in response to calcium. This will support our goal of creating novel responsive biomaterials for healthcare applications.
DOI: 10.5286/isis.e.rb2220774-1
title: Investigation of Hydrogel Architecture Constructed from the Strongest Protein Fold

description: Proteins are bionanomachines and provide a diverse range of biological functions. By using folded proteins as building blocks, we can create functional biomaterials with specific mechanical and structural properties. An exciting new building block is the staphylococcal adhesin B domain (SdrG B1) which holds the position of being the strongest ever protein to date. The mechanical properties of this protein are sensitive to calcium in the environment, making it an attractive mechanically robust and responsive building block. In this project we will obtain important structural insight into the network which is formed by connected SdrG B1 proteins. This will help us to understand the mechanically robust scaffold created by the protein network and how it changes in response to calcium. This will support our goal of creating novel responsive biomaterials for healthcare applications.
DOI: 10.3535/454-1r7-085
title: Filago pyramidata L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/d10-bkv-4pb
title: Valerianella discoidea (L.) Loisel.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220342
title: Study on the magnetic dynamics of the honeycomb compound Ba2Ni(PO4)2

description: Due to the interplay between quantum fluctuations and geometric frustrations, geometrically frustrated magnet exhibits a large degeneracy of the ground state and demonstrates exotic properties, such as fractional magnetization platform and so on. The ground state and quantum magnetization process have been well understood both theoretically and experimentally for two-dimensional (2D) spin-1/2 system. However, the quantum effects remain elusive when the spin moment increases. Ba2Ni(PO4)2 is a 2D spin-1 frustrated quantum magnet with honeycomb arrangement of the magnetic Ni2+ ions and zigzag chain structure along a axis. This special spin configuration leads to interesting properties. We propose to study the spin dynamics of the ground state, which will help us to reveal the complex interaction in Ba2Ni(PO4)2 and provide links between macroscopic properties and microscopic mechanism.
DOI: 10.5286/isis.e.rb2220342-1
title: Study on the magnetic dynamics of the honeycomb compound Ba2Ni(PO4)2

description: Due to the interplay between quantum fluctuations and geometric frustrations, geometrically frustrated magnet exhibits a large degeneracy of the ground state and demonstrates exotic properties, such as fractional magnetization platform and so on. The ground state and quantum magnetization process have been well understood both theoretically and experimentally for two-dimensional (2D) spin-1/2 system. However, the quantum effects remain elusive when the spin moment increases. Ba2Ni(PO4)2 is a 2D spin-1 frustrated quantum magnet with honeycomb arrangement of the magnetic Ni2+ ions and zigzag chain structure along a axis. This special spin configuration leads to interesting properties. We propose to study the spin dynamics of the ground state, which will help us to reveal the complex interaction in Ba2Ni(PO4)2 and provide links between macroscopic properties and microscopic mechanism.
DOI: 10.5286/isis.e.rb2220669-1
title: Competition between Dipolar and Exchange Coupling in Fe19 High Spin Molecular Magnets

description: In a previous study of the S=35/2 Fe19 single molecule magnet we used WISH to get the 1.2 K ordering mode and LET to get the local field order parameter and magnetic excitations. Combining this data with Monte Carlo analysis we could deduce that, despite the presence of significant dipolar interactions due to the large spin, weak intermolecular interactions acting over distances of order 1 nm were the main factor controlling the ordering. To fully test this hypothesis, we need to shift the balance between dipolar and exchange interactions. Therefore, we are carrying out measurements for a Fe19 molecule with larger etheidi ligands in order to quantify directly the effect of driving the system more strongly towards a dipolar-dominated limit. The end result will be valuable insight into the structural and spatial dependence of weak long-ranged intermolecular superexchange interactions.
DOI: 10.3535/019-cfc-7hw
title: Nardus stricta L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/ryr-ldd-eej
title: Lathyrus aphaca L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220247
title: Investigation of the Structural Evolution of Small Molecule-Doped Ethomeen 18/12 Self Assembled Structures

description: The precise mechanism by which organic friction modifiers adsorb to a metal surface and reduce friction and wear remains unclear. Conflicting results exist between the currently accepted theory for lubrication and molecular dynamics simulations. In order to utilise these compounds optimally, this mechanism must be precisely understood, informing the next generation of friction modifiers that drastically improve the lifetimes of engines and significantly reduce fuel emissions. This work will exploit the use of SANS and deuteration to understand and characterise the self-assembly and structural evolution of Ethomeen 18/12 with phenol, propionic acid, and salicylic acid-doping.
DOI: 10.5286/isis.e.rb2220247-2
title: Investigation of the Structural Evolution of Small Molecule-Doped Ethomeen 18/12 Self Assembled Structures

description: The precise mechanism by which organic friction modifiers adsorb to a metal surface and reduce friction and wear remains unclear. Conflicting results exist between the currently accepted theory for lubrication and molecular dynamics simulations. In order to utilise these compounds optimally, this mechanism must be precisely understood, informing the next generation of friction modifiers that drastically improve the lifetimes of engines and significantly reduce fuel emissions. This work will exploit the use of SANS and deuteration to understand and characterise the self-assembly and structural evolution of Ethomeen 18/12 with phenol, propionic acid, and salicylic acid-doping.
DOI: 10.5286/isis.e.rb2220669
title: Competition between Dipolar and Exchange Coupling in Fe19 High Spin Molecular Magnets

description: In a previous study of the S=35/2 Fe19 single molecule magnet we used WISH to get the 1.2 K ordering mode and LET to get the local field order parameter and magnetic excitations. Combining this data with Monte Carlo analysis we could deduce that, despite the presence of significant dipolar interactions due to the large spin, weak intermolecular interactions acting over distances of order 1 nm were the main factor controlling the ordering. To fully test this hypothesis, we need to shift the balance between dipolar and exchange interactions. Therefore, we are carrying out measurements for a Fe19 molecule with larger etheidi ligands in order to quantify directly the effect of driving the system more strongly towards a dipolar-dominated limit. The end result will be valuable insight into the structural and spatial dependence of weak long-ranged intermolecular superexchange interactions.
DOI: 10.3535/5ld-tln-qq9
title: Briza media L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/jb7-ays-zvs
title: Sedum hispanicum L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2210066
title: Green & cost effective CO2-thickners composed of trimethyl silyl-type amphiphiles, cross-linkers and polymers for enhanced oil recovery

description: Many hydrocarbon (HC)-polymers have been tested for increasing CO2 viscosity for using in enhanced oil recovery applications (CO2-EOR). However, those have been shown to be impractical for viscosity enhancements due to their poor solubility in supercritical CO2 (scCO2). Recent SANS studies found that tailor-made fluorocarbon (FC)-HC amphiphiles can form rod-like aggregates, encapsulating HC-polymers, in scCO2. The rod length was strongly depended on architectures and concentrations of both amphiphiles and HC-polymers. On the other hand, amphiphiles having CO2-philic trimethylsilyl groups formed disk-like aggregates in scCO2. In order to develop inexpensive and environmentally friendly (FC-free) CO2-thickners for CO2-EOR applications, this proposed experiment will explore optimum structures of amphiphiles, cross-linkers and HC-polymers to generate viscous rod-like aggregates in scCO2.
DOI: 10.5286/isis.e.rb2210066-1
title: Green & cost effective CO2-thickners composed of trimethyl silyl-type amphiphiles, cross-linkers and polymers for enhanced oil recovery

description: Many hydrocarbon (HC)-polymers have been tested for increasing CO2 viscosity for using in enhanced oil recovery applications (CO2-EOR). However, those have been shown to be impractical for viscosity enhancements due to their poor solubility in supercritical CO2 (scCO2). Recent SANS studies found that tailor-made fluorocarbon (FC)-HC amphiphiles can form rod-like aggregates, encapsulating HC-polymers, in scCO2. The rod length was strongly depended on architectures and concentrations of both amphiphiles and HC-polymers. On the other hand, amphiphiles having CO2-philic trimethylsilyl groups formed disk-like aggregates in scCO2. In order to develop inexpensive and environmentally friendly (FC-free) CO2-thickners for CO2-EOR applications, this proposed experiment will explore optimum structures of amphiphiles, cross-linkers and HC-polymers to generate viscous rod-like aggregates in scCO2.
DOI: 10.5286/isis.e.rb2220613-1
title: Resolution of Attenuating Lithium Fronts in Sulphur based Solid-State Electrolytes

description: Advanced batteries with increased energy density and safety are essential to decarbonisation and the clean economy. Solid-state Li-ion batteries (SSBs) have a higher energy density compared to current lithium-ion batteries in terms of both weight and volume. Solid electrolytes (SEs) within SSBs provide enhanced safety compared to flammable liquid electrolytes. However, SEs suffer from cracking and other mechanical failures during their operation that limit their lifespan. The purpose of this experiment will be to visualise the lithium movement through a sulfide-based SE with neutron tomography. Utilizing various isotopes of Li, some which absorb neutrons and others that do not, we can gain insight to the Li-ion diffusion in a SE.
DOI: 10.3535/c6f-hfm-46v
title: Salvia viridis L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220526
title: Natural care products: deposition studies of sustainable polymers and surfactant mixtures

description: The aim is to reveal the properties of coacervate complexes of oppositely charged natural surfactants (medium-chain fatty acid salts) and biobased cationic polysaccharides deposited on surfaces. This is needed to develop formulated products with more sustainable ingredients. Neutron reflectometry measurements on polymer-surfactant mixtures upon dilution at various SLD contrasts are expected to provide detailed information on the layering of the components (polymers and surfactants) on the model surface, in terms of the position they occupy, the thickness of each layer, how layers interpenetrate each other and their density profile within the film along the distance from the surface. A pre-characterisation (visual inspection, DLS, SAXS and ellipsometry) has shown the formation of coacervates that deposit on a silica surface, occurring when the composition approaches the surfactant CMC.
DOI: 10.5286/isis.e.rb2220526-1
title: Natural care products: deposition studies of sustainable polymers and surfactant mixtures

description: The aim is to reveal the properties of coacervate complexes of oppositely charged natural surfactants (medium-chain fatty acid salts) and biobased cationic polysaccharides deposited on surfaces. This is needed to develop formulated products with more sustainable ingredients. Neutron reflectometry measurements on polymer-surfactant mixtures upon dilution at various SLD contrasts are expected to provide detailed information on the layering of the components (polymers and surfactants) on the model surface, in terms of the position they occupy, the thickness of each layer, how layers interpenetrate each other and their density profile within the film along the distance from the surface. A pre-characterisation (visual inspection, DLS, SAXS and ellipsometry) has shown the formation of coacervates that deposit on a silica surface, occurring when the composition approaches the surfactant CMC.
DOI: 10.5286/isis.e.rb2220613
title: Resolution of Attenuating Lithium Fronts in Sulphur based Solid-State Electrolytes

description: Advanced batteries with increased energy density and safety are essential to decarbonisation and the clean economy. Solid-state Li-ion batteries (SSBs) have a higher energy density compared to current lithium-ion batteries in terms of both weight and volume. Solid electrolytes (SEs) within SSBs provide enhanced safety compared to flammable liquid electrolytes. However, SEs suffer from cracking and other mechanical failures during their operation that limit their lifespan. The purpose of this experiment will be to visualise the lithium movement through a sulfide-based SE with neutron tomography. Utilizing various isotopes of Li, some which absorb neutrons and others that do not, we can gain insight to the Li-ion diffusion in a SE.
DOI: 10.3535/0f1-85w-svl
title: Plantago afra L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/ecc-yq1-ztp
title: Linum strictum L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220189-1
title: Effect of heat-cool cycles on the behaviour of perylene bisimides

description: Perylene bisimides (PBIs) are low molecular weight gelators (LMWGs) commonly used in organic electronic devices. In water, PBIs can self-assemble, with the arrangement of these molecules defining their electronic properties. These LMWGs are commonly used in electronic devices as thin films, which can be formed by thermal annealing. When heated and re-cooled, there is a significant increase in the viscosity of these LMWGs in water. We expect that the heat-cool cycle is altering the assembly of the PBIs in water and thereby changing their behaviour. Therefore, we hope to probe the effect of heating and cooling on the structures formed by various PBIs in water to understand these observations and give us the best performance in our thin films.
DOI: 10.5286/isis.e.rb2220240
title: Investigation of Shear-Dependent Conformational Changes of Acetic Acid-doped Organic Friction Modifier Films at the Iron Oxide/Oil Interface

description: Lubrication ensures the reliable operation of combustion engines whilst also offering a reduction in emissions and fuel consumption. Organic friction modifiers (OFMs) are a common class of friction reducing additives included in engine lubricants and are known to adsorb at metal surfaces. However, the exact mechanism by which they operate has yet to be defined. To understand how these additives function, a novel tribometer rig has been developed. This enables neutron reflectivity experiments to be carried out at elevated temperatures and pressures, whilst the surface is sheared. In this set of experiments, we will measure the thickness of the film formed by Ethomeen 18/12 molecules on iron oxide surfaces as a function of shear rate and acetic acid doping.
DOI: 10.5286/isis.e.rb2220240-1
title: Investigation of Shear-Dependent Conformational Changes of Acetic Acid-doped Organic Friction Modifier Films at the Iron Oxide/Oil Interface

description: Lubrication ensures the reliable operation of combustion engines whilst also offering a reduction in emissions and fuel consumption. Organic friction modifiers (OFMs) are a common class of friction reducing additives included in engine lubricants and are known to adsorb at metal surfaces. However, the exact mechanism by which they operate has yet to be defined. To understand how these additives function, a novel tribometer rig has been developed. This enables neutron reflectivity experiments to be carried out at elevated temperatures and pressures, whilst the surface is sheared. In this set of experiments, we will measure the thickness of the film formed by Ethomeen 18/12 molecules on iron oxide surfaces as a function of shear rate and acetic acid doping.
DOI: 10.3535/mpa-7g8-gv2
title: Filago arvensis L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220189
title: Effect of heat-cool cycles on the behaviour of perylene bisimides

description: Perylene bisimides (PBIs) are low molecular weight gelators (LMWGs) commonly used in organic electronic devices. In water, PBIs can self-assemble, with the arrangement of these molecules defining their electronic properties. These LMWGs are commonly used in electronic devices as thin films, which can be formed by thermal annealing. When heated and re-cooled, there is a significant increase in the viscosity of these LMWGs in water. We expect that the heat-cool cycle is altering the assembly of the PBIs in water and thereby changing their behaviour. Therefore, we hope to probe the effect of heating and cooling on the structures formed by various PBIs in water to understand these observations and give us the best performance in our thin films.
DOI: 10.5286/isis.e.rb2220764
title: Effect of magnetic field on the magnetic structure of Fe-doped MnNiGe alloys

description: Magnetic equiatomic alloys (MEAs) of the general formula MM′X (M, M′ = transition metals, X = Si, Ge, Sn) undergo a magnetostructural transition of martensitic type on cooling from high temperature. Recently, these alloys have been identified as a new class of shape memory alloy and attracted considerable attention due to their rewarding magneto-functional properties like large magnetocaloric effect, exchange bias effect, magnetoresistance, and observation of spin-glass like ground state. In this proposal, our aim is to focus on the effect of an external magnetic field on the magnetic structure of two Fe-doped MnNiGe alloys of nominal compositions Mn0.85Fe0.15NiGe and MnNi0.75Fe0.25Ge where magnetic structure plays a crucial role behind their magneto-functionality. We have previously performed ambient and high-pressure neutron diffraction measurements in zero fields.