Building materials from the bottom up is complementary to traditional top-down materials processing, but requires a deep understanding of the individual molecular structures, their assemblies, and dynamic behaviors.
PSi materials are termed "top-down" materials as opposed to the synthesized mesoporous molecular sieves, which are so called "bottom-up" silica materials that refer to the self-assembly of silicon oxide by means of polymeric templates determining the structure obtained.
However, the trituration and succussion procedures in classical homeopathic remedy preparation may actually be crude manual methods that generate "top down" nanoparticles of source material.
Approaches used for the manufacturing materials are categorized into bottom up techniques, top down techniques, and the combination of bottom up and top down techniques.
Top, down, starting with hair.
In top down techniques, materials are micronized by cutting, carving, and molding for manufacturing of nanomaterials.
Following the reverse process, a top-down deconstruction, cellulose materials can be cleaved from fiber cell walls.
The top-down approach involves material deposition and anisotropic plasma etching to create a nanowire.
It could be argued that using a "top-down" approach to develop materials [ 35] may not help people to own the change process, which was key to successful implementation in this research project.
Top gel shows the pull-down material from Ni2+ beads with or without Nap1; bottom gel shows the input before the pull-down, as control.
Direct fabrication of synthetic nanoparticles by top-down physical routes, in which materials are vacuum-deposited in a nanopatterned polymer template, allows massive synthesis by a low-cost batch-type process and exquisite control over material composition, multilayer structure, particle size, and shape, which is not achievable with chemical nanoparticle synthesis.
