A5050782114- Photonic Crystals and Applications
- Advanced Cellulose Research Studies
- Liquid Crystal Research Advancements
- Photonic and Optical Devices
- Biocrusts and Microbial Ecology
- Plant and animal studies
- Plasmonic and Surface Plasmon Research
- Pickering emulsions and particle stabilization
- Random lasers and scattering media
- Photoreceptor and optogenetics research
- Polysaccharides and Plant Cell Walls
- Algal biology and biofuel production
- Advanced Materials and Mechanics
- Block Copolymer Self-Assembly
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Polymer Synthesis and Characterization
- Insect and Arachnid Ecology and Behavior
- Diatoms and Algae Research
- Advanced Optical Imaging Technologies
- Photosynthetic Processes and Mechanisms
- Metamaterials and Metasurfaces Applications
- Near-Field Optical Microscopy
- Optical Coherence Tomography Applications
- Plant Diversity and Evolution
- Photochromic and Fluorescence Chemistry
University of Cambridge
2016-2025
Max Planck Institute of Colloids and Interfaces
2023-2025
International Institute for Sustainability
2024
Hiroshima University
2024
Institut d’Optique Graduate School
2023
Université Claude Bernard Lyon 1
2023
Centre National de la Recherche Scientifique
2023
Institut Lumière Matière
2023
Université de Bordeaux
2023
Laboratoire Photonique, Numérique et Nanosciences
2023
Biological communication by means of structural color has existed for at least 500 million years. Structural is commonly observed in the animal kingdom, but been little studied plants. We present a striking example multilayer-based strong iridescent coloration plants, fruit Pollia condensata . The caused Bragg reflection helicoidally stacked cellulose microfibrils that form multilayers cell walls epicarp. demonstrate animals and plants have convergently evolved photonic structures to...
Optical metamaterials have unusual optical characteristics that arise from their periodic nanostructure. Their manufacture requires the assembly of 3D architectures with structure control on 10-nm length scale. Such a metamaterial, based replication self-assembled block copolymer into gold, is demonstrated. The resulting gold replica has feature size two orders magnitude smaller than wavelength visible light. Its signature reveals an archetypal Pendry wire metamaterial linear and circular...
The gyroid is a continuous and triply periodic cubic morphology which possesses constant mean curvature surface across range of volumetric fill fractions. Found in variety natural synthetic systems form through self‐assembly, from butterfly wing scales to block copolymers, the also exhibits an inherent chirality not observed any other similar morphologies. These unique geometrical properties impart structured materials host interesting optical properties. Depending on length scale...
Cellulose nanocrystals (CNCs) form chiral nematic phases in aqueous suspensions that can be preserved upon evaporation of water. The resulting films show an intense directional coloration determined by their microstructure. Here, microreflection experiments correlated with analysis the helicoidal nanostructure reveal iridescent colors and ordering individual layers are strongly dependent on polydispersity size distribution CNCs. We how this affects self-assembly process, hence multidomain...
The fabrication of self-assembled cellulose nanocrystal (CNC) films tunable photonic and mechanical properties using a facile, green approach is demonstrated. combination flexibility iridescence can dramatically expand CNC coating film barrier capabilities for paints applications, sustainable consumer packaging products, as well effective templates optoelectronic materials structures.
The outer layers of a range plant tissues, including flower petals, leaves and fruits, exhibit an intriguing variation microscopic structures. Some these structures include ordered periodic multilayers diffraction gratings that give rise to interesting optical appearances. colour arising from such is generally brighter than pigment-based colour. Here, we describe the main types photonic found in plants discuss experimental approaches can be used analyse them. These allow identification...
The self-assembly process of photonic structures made cellulose nanocrystals is studied in detail by locally monitoring and controlling water evaporation. Three different stages during the evaporation are identified. Spectroscopy quantifies amount disorder fabricated samples. Control this enables selection a range colors starting from same suspension, providing facile, sustainable route for manufacture structural color.
Complex hierarchical architectures are ubiquitous in nature. By designing and controlling the interaction between elementary building blocks, nature is able to optimize a large variety of materials with multiple functionalities. Such control is, however, extremely challenging man-made materials, due difficulties their at different length scales simultaneously. Here, cholesteric obtained by self-assembly cellulose nanocrystals within shrinking, micron-sized aqueous droplets. This confined,...
The self-assembly of cellulose nanocrystals is a powerful method for the fabrication biosourced photonic films with chiral optical response. While various techniques have been exploited to tune properties such systems, presence external fields has yet be reported significantly modify their properties. In this work, by using small commercial magnets (≈ 0.5-1.2 T) orientation cholesteric domains enabled in suspension as they assemble into films. A detailed analysis these shows an unprecedented...
Microbial consortia are a promising alternative to monocultures of genetically modified microorganisms for complex biotransformations. We developed versatile consortium-based strategy the direct conversion lignocellulose short-chain fatty acids, which included funneling lignocellulosic carbohydrates lactate as central intermediate in engineered food chains. A spatial niche enabled situ cellulolytic enzyme production by an aerobic fungus next facultative anaerobic lactic acid bacteria and...
Plasmonic metasurfaces are a promising route for flat panel display applications due to their full color gamut and high spatial resolution. However, this plasmonic coloration cannot be readily tuned requires expensive lithographic techniques. Here, we present scalable electrically driven color-changing constructed using bottom-up solution process that controls the crucial gaps fills them with an active medium. Electrochromic nanoparticles coated onto metallic mirror, providing smallest-area...
Passive radiative cooling (RC) enables the of objects below ambient temperature during daytime without consuming energy, promising to be a game changer in terms energy savings and CO2 reduction. However, so far most RC surfaces are obtained by energy-intensive nanofabrication processes or make use unsustainable materials. These limitations overcome developing cellulose films with unprecedentedly low absorption solar irradiance strong mid-infrared (mid-IR) emittance. In particular,...
Abstract This review paper provides a recent overview of current international research that is being conducted into the functional properties cellulose as nanomaterial. A particular emphasis placed on fundamental and applied undertaken to generate applications, which are now becoming real prospect given developments in field over last 20 years. short introduction covers context work, definitions different forms nanomaterials (CNMs) most widely studied. We also address terminology used for...
Abstract The transfer of chirality across length-scales is an intriguing and universal natural phenomenon. However, connecting the properties individual building blocks to emergent features their resulting large-scale structure remains a challenge. In this work, we investigate origins mesophase in cellulose nanocrystal suspensions, whose self-assembly into chiral photonic films has attracted significant interest. By correlating ensemble behaviour suspensions with quantitative morphological...
Daytime radiative cooling (DRC) materials offer a sustainable approach to thermal management by exploiting net positive heat transfer deep space. While such typically have white or mirror-like appearance maximize solar reflection, extending the palette of available colors is required promote their real-world utilization. However, incorporation conventional absorption-based colorants inevitably leads heating, which counteracts any effect. In this work, efficient sub-ambient DRC (Day: -4 °C,...
Abstract When pursuing sustainable approaches to fabricate photonic structures, nature can be used as a source of inspiration for both the nanoarchitecture and constituent materials. Although several biomaterials have been promised suitable candidates materials pigments, their fabrication processes limited small medium-scale production films. Here, by employing substrate-free process, structurally coloured microparticles are produced via confined self-assembly cholesteric cellulose...
Abstract Cellulose nanocrystals (CNCs) are a new class of biodegradable nanomaterial derived from the most abundant and renewable biomass on planet: cellulose. Due to their potential as low carbon footprint nanomaterial, CNCs have received significant interest in community for wide variety applications. In this review, recent strategies exploited produce therefore summarized, focusing “greener” isolation methods aiming at minimizing environmental impact production. The each production method...
The study of optics in correlated disordered media combines wave physics, complex media, and nanophotonics. Investigations have shown how subwavelength structural correlations control light scattering, transport, localization. This article reviews the formalism behind scattering experimental techniques, achievements studying interaction with disorder. It explores phenomena like optical transparency, superdiffusive photonic gaps, offering new perspectives for applications. research covers...