Fabrication of three-dimensional imprint lithography templates by colloidal dispersions

Suppressing Crack Formation in Particulate Systems by Utilizing Capillary Forces

“…These crack morphologies are dependent on the particle shape as well as any microstructure formed by a percolated network as these particles dry . Common solutions proposed to achieve fracture-free layers from suspensions include the use of soft particles with a sufficiently low glass transition temperature to allow for a relaxation of the drying induced interparticle tensile stress by deformation, the addition of a plasticizer, polymer, or a blend of soft and hard particles to provide the required deformability of the particles. − The use of a soft substrate, or changing other substrate properties such as the wetting and roughness, can also reduce crack formation . Another approach is to coat a colloidal precursor.…”

Imaging stress and strain in the fracture of drying colloidal films

“…Fracture is common during drying and solidication of colloidal lms. In many applications, cracks can be avoided by using so particles, 1 coating hard particles with so shells, 2 mixing various ratios of hard and so particles, 3,4 introducing polymeric plasticizers, 5 or employing sequential deposition of multiple layers. 6,7 However, these strategies are not always available.…”

The effect of shear-thickening on liquid transfer from an idealized gravure cell

“…This technology enables the fabrication of thin organic, inorganic and mixed organic/inorganic films with nanoscale patterns at high resolution for devices in wide applications such as, solar cells, thin film transistors, organic light emitting diodes, biosensors and biodevices [3][4][5][6][7][8]. Gravure printing is a roll-to-roll processing technique used to coat/print thin films less than 50 lm for a wide variety of applications in high volumes such as magazines, packaging, flexible electronics, greeting cards and tapes [9][10][11][12].…”