Nanotubes prepared by electroless deposition: investigation of the nanostructure formation mechanism and characterisation of physical properties

In this research, we investigate electrolessly deposited nanotubes due to their unique associated magnetic and catalytic properties. The main challenge associated with electroless deposition is the formation of a nanotube structure with a uniform wall thickness. In this study, we investigate the electroless deposition process of nanotubes within a polycarbonate membrane. By identifying the conditions required to ensure a kinetically controlled deposition process, we achieve the formation of continuous nanotubes with a uniform wall thickness. Electrolessly deposited alloys containing Ni, Fe and Co are magnetic and have many potential applications in future technologies. In this work, we investigate the magnetic properties of a series of alloys including Ni-B, Ni-Fe-B, Co-B and Ni-Cu-B nanotube structures. We establish the relationships between the magnetic properties of the nanostructure and their structure and compositional parameters. We also characterise the magnetic reversal mechanisms associated with the nanotube structure, which depend on the alloy used. We achieve a maximum specific magnetisation of 84.3 J T-1 kg-1 and a minimum coercivity of 0.003 T. Alloyed deposits containing B can be used to catalyse hydrogen release from an alkaline NaBH4 solution. In this study, a variety of nanostructured alloys, including Ni-B, Co-B, NiCu-B, NiFe-B and NiCo-B and CoNiFe-B are investigated as catalysts for hydrogen generation. We show that nanostructured catalysts have larger hydrogen generation than metallic films with a maximum hydrogen generation rate of 10,800 ml min-1 g-1

Investigation of the magnetization reversal mechanism of electrolessly deposited Co-B nanotubes

Co-B nanotubes were prepared via an electroless deposition method. The morphology, magnetic properties and the magnetization reversal mechanism of the nanotubes were investigated. Deposition was carried out in porous polycarbonate membranes leading to the formation of Co-B nanotubes with an average external diameter of 400 nm and lengths up to 6 μm. Electroless deposition resulted in the formation of alloys with composition Co70B30 and a specific magnetization of 65.6 J T−1kg−1, which is about 40 % of that of pure Co (161 J T−1kg−1). The transversal and vortex modes were identified as the mechanisms responsible for magnetization reversal in the nanotubes. A crossover between the two modes is observed at low angles and the results are in line with current models for switching mechanisms of nanotubes

all_data_and_analysis_scripts

All data and analysis scripts. An explainer text file is included in the zipped folde

An Organocatalysis Based Carbocyclic Spiroindoline Synthesis Enables Facile Structure–Activity Relationship (SAR) Study at C2 Position

An asymmetric synthesis of carbocyclic spiroindoline by sequential Michael reaction and [3 + 2]-cycloaddition is described. This protocol demonstrates excellent enantio- and diastereoselectivity with broad functional group tolerance. A diverse range of spiroindolines were prepared by this approach, and the products served as ideal substrates for C2 derivatization

A Highly Stereoselective and Scalable Synthesis of l‑allo-Enduracididine

A highly stereoselective and scalable synthesis of l-allo-enduracididine from hydroxyproline derivative is described. Pyrrolidine oxidation and reductive ring opening are the key steps in the synthesis. Compared to previously reported approaches, the current route affords l-allo-enduracididine in 10 steps from <b>3</b> in 31% overall yield with >50:1 diastereoselectivity

Wright et al_DRYADdata_110314

An excel file containing two sheets. One sheet of microsatellite genotypes and one sheet of major histocompatibility (MHC) genotypes of Seychelles warblers, along with a unique individual identifier, the island and year of sampling

MOESM1 of County-level hurricane exposure and birth rates: application of difference-in-differences analysis for confounding control

Additional file 1. Supplemental Digital Content 1. Model form and code for difference-in-differences method application. Supplemental Digital Content 2. Table of Florida 2004 unadjusted, census adjusted and difference-in-difference analysis of Hurricane exposure and live birth rates (n = 67 counties)

Solid-State NMR Characterization of the Molecular Conformation in Disordered Methyl α‑l‑Rhamnofuranoside

A combination of solid-state ¹³C NMR tensor data and DFT computational methods is utilized to predict the conformation in disordered methyl α-l-rhamnofuranoside. This previously uncharacterized solid is found to be crystalline and consists of at least six distinct conformations that exchange on the kHz time scale. A total of 66 model structures were evaluated, and six were identified as being consistent with experimental ¹³C NMR data. All feasible structures have very similar carbon and oxygen positions and differ most significantly in OH hydrogen orientations. A concerted rearrangement of OH hydrogens is proposed to account for the observed dynamic disorder. This rearrangement is accompanied by smaller changes in ring conformation and is slow enough to be observed on the NMR time scale due to severe steric crowding among ring substituents. The relatively minor differences in non-hydrogen atom positions in the final structures suggest that characterization of a complete crystal structure by X-ray powder diffraction may be feasible

Data for all analysis of sibling rivalry across life

Each tab contains the data used for one analysis

Zip file containing all datasets for this publication

This .zip file contains 10 different datasets, which have been split up for each analysis separately, for easier reproducibility. The info.txt file which is included, explains the data contained in each file