METHOD OF MANUFACTURE OF PARTICLES WITH CONTROLLED DIMENSIONS

摘要

A process for the preparation of particles with controlled dimensions comprising the steps of: (i) providing a laminar substrate having a patterned surface comprising a micro-relief repeat pattern comprising one or more discrete cells, each cell consisting of a floor portion and walls having a height (H_W); (ii) depositing organic or inorganic material onto the patterned surface and into the cells to provide a thickness (T) of the deposited material wherein T = H_W; (iii) stripping the deposited organic or inorganic material from the surface of the substrate; and (iv) collecting the particles formed from said organic or inorganic material; and a composition obtainable from said process comprising a plurality of particles (P), wherein the number (n) of particles in said composition is at least 10, wherein said particles (P) are platelets exhibiting a planar geometry which is circular or which is made up of a number (x) of planar (y)-sided polygon(s), wherein x is from 1 to 20 and y is at least 3 wherein if x is greater than 1 then said planar (y)-sided polygons are fused along one or more sides thereof, wherein the width (W_P) of the platelets (P) at their widest point is no more than about 250 µm and the thickness of the platelets (P) is in the range of 10 nm to 50nm.