A5014729367- Animal Behavior and Reproduction
- Neurobiology and Insect Physiology Research
- Organic Electronics and Photovoltaics
- Lepidoptera: Biology and Taxonomy
- Insect and Arachnid Ecology and Behavior
- Photonic Crystals and Applications
- Nanofabrication and Lithography Techniques
- Silk-based biomaterials and applications
- Biocrusts and Microbial Ecology
- melanin and skin pigmentation
- Thermal properties of materials
- Material Dynamics and Properties
- Digital Holography and Microscopy
- Advanced X-ray Imaging Techniques
- Fiber-reinforced polymer composites
- Synthesis and Characterization of Heterocyclic Compounds
- Liquid Crystal Research Advancements
- Free Radicals and Antioxidants
- Epoxy Resin Curing Processes
- Reproductive biology and impacts on aquatic species
- Enhanced Oil Recovery Techniques
- Strong Light-Matter Interactions
- Leaf Properties and Growth Measurement
- Surfactants and Colloidal Systems
- Insect Pheromone Research and Control
University of Sheffield
2015-2025
University of California, Davis
2015
The diversity and vividness of structural colour in the natural world have been recognised as far back William Hooke 17th century. Whilst it is only recently that advances field revealed elegance finesse physics used to create these effects. In this topical review we will highlight some structures effects responsible for butterfly scales, bird feathers, plants, insects beetle elytra studied date. We discuss look at similarities differences between species. This be alongside our current...
Abstract Vivid structural colours in butterflies are caused by photonic nanostructures scattering light. Structural evolved for numerous biological signalling functions and have important technological applications. Optically, such structures well understood, however insight into their development vivo remains scarce. We show that actin is intimately involved colour formation butterfly wing scales. Using comparisons between iridescent (structurally coloured) non-iridescent scales adult...
Organic electronics promise to provide flexible, large-area circuitry such as photovoltaics, displays, and light emitting diodes that can be fabricated inexpensively from solutions. A major obstacle this vision is most conjugated organic materials are miscible, making solution-based fabrication of multilayer or micro- nanoscale patterned films problematic. Here we demonstrate the solubility prototypical conductive polymer poly(3-hexylthiophene) (P3HT) reversibly "switched off" using high...
Abstract Eurasian Jay ( Garrulus glandarius ) feathers display periodic variations in the reflected colour from white through light blue, dark blue and black. We find structures responsible for are continuous their size spatially controlled by degree of spinodal phase separation corresponding region feather barb. Blue have a well-defined broadband ultra-violet (UV) to wavelength distribution; nanostructure has characteristic morphology with lengthscale order 150 nm. White regions larger 200...
Iridescence is an optical phenomenon whereby colour changes with the illumination and viewing angle. It can be produced by thin film interference or diffraction. Iridescent structures are fairly common in nature, but relatively little known about their production evolution. Here we describe responsible for producing blue-green iridescent Heliconius butterflies. Overall wing scale of non-iridescent species very similar, both having longitudinal ridges joined cross-ribs. However, scales have...
Abstract Cyphochilus beetle scales are amongst the brightest structural whites in nature, being highly opacifying whilst extremely thin. However, formation mechanism for voided intra-scale structure is unknown. Here we report 3D x-ray nanotomography data chitin networks of intact white and Lepidiota stigma . Chitin-filling fractions found to be 31 ± 2% 34 1% , indicating previous measurements overestimated their density. Optical simulations using finite-difference time domain morphologies...
We have fabricated organic polariton microcavities that exhibit remarkable photostability, even in the condensation regime.
Controlling the nanomorphology in bulk heterojunction photoactive blends is crucial for optimizing performance and stability of organic photovoltaic (OPV) technologies. A promising approach to alter drying dynamics consequently, nanostructure blend film using solvent additives such as 1,8-diiodooctane (DIO). Although this demonstrated extensively OPV systems incorporating fullerene-based acceptors, it unclear how additive processing influences morphology nonfullerene acceptor (NFA) systems....
Porous polystyrene microspheres were produced by a process of nonsolvent induced phase separation (NIPS) from ternary polymer–solvent–nonsolvent (polystyrene–toluene–ethanol) systems and characterized scanning electron microscopy (SEM) small-angle X-ray scattering (SAXS) techniques. This study provides evidence for link between the structural morphology porous particles concentration in initial solutions. A reciprocal relationship pore diameter polymer was observed with amount below critical...
Abstract High resolution X-ray nano-tomography experiments are often limited to a few tens of micrometer size volumes due detector size. It is possible, through the use multiple overlapping tomography scans, produce large area scan which can encompass sample in its entirety. Mounting and positioning regions be scanned highly challenging normally requires focused ion beam approaches. In this work we have imaged intact beetle scale cells mounted on tip needle using micromanipulator stage. Here...
Abstract Vivid structural colors in butterflies are caused by photonic nanostructures scattering light. Structural evolved for numerous biological signaling functions and have technological applications. Optically, such structures well understood, however their development vivo remains obscure. We show that actin is intimately involved color formation the butterfly Heliconius sara . Using comparisons between iridescent (structurally colored) non-iridescent scales adult developing H. , we...
Christian Kuttner opened a general discussion of the paper by Pete Vukusic: You have pointed out differences between ordered, quasi-ordered and disordered systems. But how does this relate to short- long-range order? For example, some densely packed arrangements may very unifor
The hydrophilicity of epoxy resin coatings is most sensitive to humidity and induction time. Stoichiometry (amine content) has some effect on surface strongly influences bulk T g /void volume along with cure temperature.
Organic electronics promise to provide flexible, large-area circuitry such as photovoltaics, displays, and light emitting diodes that can be fabricated inexpensively from solutions. A major obstacle this vision is most conjugated organic materials are miscible, making solution-based fabrication of multilayer or micro- nanoscale patterned films problematic. Here we demonstrate the solubility prototypical conductive polymer poly(3-hexylthiophene) (P3HT) reversibly "switched off" using high...
Abstract Both pigmentary and structural colours share many common elements of their feather anatomy, i.e. keratin, air melanin packed in the melanosomes, despite utilizing different mechanisms colour production. This means that evolutionary transitions between can be achieved through a simple adjustment these elements. Recently, an hypothesis for transition grey, slate finally to blue has been proposed confirmed clade Tanagers on macroevolutionary level. Here, we investigate mechanistic...