top of page
Images from research projects I've been part of:
Biaxially aligned crystals in microchannels brighten up when rotated 45 degrees. The images are polarized optical microscopy images.
Crystallizing from aligned liquid crystals leads to organized crystals.
Organic semiconductor HAT6 in its columnar hexagonal phase.
This is a polarized optical microscopy image of HAT6 in its columnar hexagonal phase.
Polymorph selection in organic semiconductor.
Upon being heated at the same temperature, glasses of organic semiconductor CBP form different crystal polymorphs based on their preparation temperature.
Image Credit: Niko Van den Brande
Image Credit: Niko Van den Brande
Helically twisting crystals.
Crystals of organic semiconductor Alq3 form a helix like-structure upon being annealed from the glassy state.
Directed self assembly of liquid photonic crystals.
The images shown are polarized optical microscopy images of materials called blue phase liquid crystals. These materials get their color from the wavelength at which they reflect light. The lattice orientation in these materials is controlled using nanopatterned surfaces. A pattern with a wavelength of 220 nm promotes a lattice orientation that reflects red light (at the lowest temperature) while a pattern with a wavelength of 170 nm promotes an orientation that reflects green light (at the highest temperature).
Image Credit: Tadej Emersic
Image Credit: Tadej Emersic
Scanning electron microscope image of electron beam patterns.
The images shows a pattern of photoresist on silicon. The pattern is prepared using electron beam lithography.
X-Ray patterns from thin and thick films of organic semiconductor DSA-Ph.
In both thin and thick glassy films of organic semiconductor DSA-Ph molecules are horizontally oriented giving rise to excess scattering in the out of plane direction.
Structure in organic superlattices is determined by subsrate temperature during deposition.
Shown here are X-Ray scattering patterns from glassy organic electronic films in different geometries prepared using vacuum evaporation. Whether the molecules are in thick layers or in ultrathin ~ 10 nm alternating layers their structure is determined by deposition temperature. Alq3 molecules are represented by spheres and DSA-Ph molecules are represented by rods.
Image Credit: Marie Fiori
Image Credit: Marie Fiori
Forming patterns with a single layer of polymer.
The pattern shown is formed using electron beam lithography. The dark regions are bare silicon and the bright regions are where single polymer chains have grafted been grafted to the surface. These surfaces guide the assembly of the liquid photonic crystals you saw earlier in the gallery.
Cover image of Advanced Functional Materials.
Blue phase structure.
Image Credit: Peter Allen
Image Credit: Peter Allen
Our work featured in Journal of Materials Chemistry C.
Mesogen HAT6 in its crystalline state in microchannels.
Image Credit: Peter Allen
Image Credit: Peter Allen
bottom of page