
Johanna Marie GallowayUniversity of Leeds · School of Chemistry
Johanna Marie Galloway
Geology BSc & MSc, Physics Ph.D
EPSRC David Clarke Research Fellow
About
41
Publications
59,062
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533
Citations
Introduction
I am currently a post doctoral research fellow working with the Meldrum group studying bioinspired and biotemplated mineralization of nanomaterials and their use in energy applications.
Additional affiliations
June 2018 - August 2023
Education
February 2009 - September 2012
Univerity of Leeds
Field of study
- Biotemplating Arrays of Nanomagnets Using the Biomineralisation Protein Mms6
October 2007 - September 2008
September 2004 - June 2005
Publications
Publications (41)
L10 cobalt platinum can be used to record data at approximately sixfold higher densities than it is possible to on existing hard disks. Currently, fabricating L10 CoPt requires high temperatures (≈500 °C) and expensive equipment. One ecological alternative is to exploit biomolecules that template nanomaterials at ambient temperatures. Here, it is d...
Understanding how molecules in self-assembled soft-matter nanostructures are organized is essential for improving the design of next-generation nanomaterials. Imaging these assemblies can be challenging and usually requires processing, e.g. staining or embedding, which can damage or obscure features. An alternative is to use bioinspired mineralizat...
The design and assembly of peptide‐based materials has advanced considerably, leading to a variety of fibrous, sheet, and nanoparticle structures. A remaining challenge is to account for and control different possible supramolecular outcomes accessible to the same or similar peptide building blocks. Here a de novo peptide system is presented that f...
The cylindrical pores of track-etched membranes offer excellent environments for studying the effects of confinement on crystallization as the pore diameter is readily varied and the anisotropic morphologies can direct crystal orientation. However, the inability to image individual crystals in situ within the pores in this system has prevented many...
The ability to control crystal nucleation through the simple addition of a nucleating agent (nucleant) is desirable for a huge range of applications. However, effective nucleating agents are known for only a small number of systems, and many questions remain about the mechanisms by which they operate. Here, we explore the features that make an effe...
Insight into the nucleation, growth and phase transformations of calcium sulfate could improve the performance of construction materials, reduce scaling in industrial processes and aid understanding of its formation in the natural environment. Recent studies have suggested that the calcium sulfate pseudo polymorph, gypsum (CaSO4·2H2O) can form in a...
X-ray scattering techniques provide a powerful means of characterizing the formation of nanoparticles in solution. Coupling these techniques to segmented-flow microfluidic devices that offer well-defined environments gives access to in situ time-resolved analysis, excellent reproducibility, and eliminates potential radiation damage. However, analys...
The design and assembly of peptide based materials has advanced considerably, leading to a variety of fibrous, sheet and nanoparticle structures. A remaining challenge is to account for and control different possible supramolecular outcomes accessible to the same or similar peptide building blocks. Here we present a straightforward de novo peptide...
Patterned thin-films of magnetic nanoparticles (MNPs) can be used to make: surfaces for manipualting and sorting cells, sensors, 2D spin ices and high density data storage devices. Conventional manufacture of patterned magnetic thin films is not environmentally friendly because it uses high temperatures (hundreds of degrees Celcius) and high vacuum...
Magnetotactic bacteria are able to synthesise precise nanoparticles of the iron oxide magnetite within their cells. These particles are formed in dedicated organelles termed magnetosomes. These lipid membrane compartments use a range of biomineralisation proteins to nucleate and regulate the magnetite cystallisation process. A key component is the...
L10 CoPt can be used in data storage, but high temperatures (500 °C) are usually needed to achieve this. On page 4590, J. Galloway and colleagues demonstrate a bioinspired and ecological synthesis that uses a biotemplating peptide to form L10 CoPt nanoparticles at room temperature. A surface covered with biotemplated magnetic nanoparticles is illus...
Rapid advancements made in technology, and the drive towards miniaturisation, means that we require reliable, sustainable and cost effective methods of manufacturing a wide range of nanomaterials. In this bioinspired study, we take advantage of millions of years of evolution, and adapt a biomineralisation protein for surface patterning of biotempla...
Significance
Magnetotactic bacteria produce morphologically precise magnetite nanoparticles within organelles termed “magnetosomes.” Biomineralization proteins tightly regulate crystallization of these nanoparticles. A master protein regulator of particle morphology in vivo, magnetosome membrane specific F (MmsF), has recently been discovered. In t...
uploaded
http://goldschmidt.info/2014/abstracts/abstractView?abstractId=4833
A magazine article for secondary school science students about biomineralisation, magentic bacteria and data storage.
In a world with ever decreasing natural reserves, researchers are striving to find sustainable methods of producing components for technology. Bioinspired, biokleptic and biomimetic materials can be used to form a wide range of technologically relevant materials under environmentally friendly conditions. Here we investigate a range of biotemplated...
Thin-films of magnetic nanoparticles (MNPs) with high coercivities are deposited onto surfaces for use in data storage applications. This usually requires specialist clean-room facilities, sputtering equipment and high temperatures to achieve the correct crystallographic phases. One possible cheaper and more environmentally friendly alternative cou...
High quality magnetic nanoparticles (MNPs) are used in applications such as
electronic data storage. Current methods for synthesising the consistent MNPs
required use high temperatures, harsh chemicals and bespoke equipment. As this
is energy intensive, expensive and not very environmentally friendly, cheaper and
„greener‟ alternatives are bein...
Metal and metal oxide nanoparticles (NPs) have many uses, and the size, shape and purity of the NPs must be uniform to ensure that the particles function in a known and consistent manner. The synthesis of uniform NPs usually requires high temperatures, high pressures, and harsh chemical reagents, which is both economically and environmentally costl...
Many modern technologies, such as high density data storage, require monodispersed magnetic nanoparticles (MNPs), which have a consistent magnetic behavior, specifically immobilized onto a patterned surface. Current methods for synthesizing uniform MNPs require high temperatures and harsh chemicals, which is not environmentally friendly. Also, the...
A biomineralization protein from magnetotactic bacteria (Mms6) used to control both the formation and location of magnetic nanoparticles in a patterned array. Mms6 immobilized on a patterned surface templates high-quality, crystalline magnetite particles with a narrow grainsize distribution and consistent magnetic behavior under relatively mild con...
Immobilized biomineralizing protein Mms6 templates the formation of uniform magnetite nanoparticles in situ when selectively patterned onto a surface. Magnetic force microscopy shows that the stable magnetite particles maintain their magnetic orientation at room temperature, and may be exchange coupled. This precision-mixed biomimetic/soft-lithogra...
Magnetic nanoparticles (MNPs) are in high demand within biomedical and nanotechnological industries. Size, shape, material and crystal quality directly affect the particle's properties, namely their magnetic characteristics, and must be tuned and controlled to meet the specification of the application. A key challenge is to refine synthetic methods...
Questions
Question (1)
Come down to the ASMbly and have a play with magnets next week. Andy will be on hand on Thursday afternoon to see what can be made with nanomagnets. http://bioleeds.wordpress.com/2014/08/29/making-with-nanoparticles-asmbly-2014-thursday-4th-sept/ Events and activities are running 3rd-9th September — at Regent Street, Leeds, LS2 7QA.