It is important to produce uniform nano-patterns with no possibility of surface exfoliation on polyethylene devices used in medical and in aerospace industry. We studied the change in the surface morphology of polyethylene at nanoscale using MeV ion beam. We have investigated the change in the surface morphology before and after ion bombardment. We have made an attempt to change the morphology to produce a uniform surface with reduced cracks and reduced granularity. For this process we have chosen ultra-high-molecular-weight polyethylene (UHMWPE). Coupons of these materials were exposed to various fluences of MeV Ag + ions. The surface morphology and the change in the chemical structure were studied using scanning micro Raman, FTIR and AFM.
Phospholipid, which is a building block of biological membranes, plays an important role in compartmentalization of cellular reaction environment and control of the physicochemical conditions inside the reaction environment. Phospholipid bilayer membrane has been proposed as a natural biocompatible platform for attaching biological molecules like proteins for biosensing related application. Due to the enormous potential applications of biomimetic model biomembranes, various techniques for depositions and patterning of these membranes onto solid supports and their possible biotechnological applications have been reported by different groups. In this work, patterning of phospholipid thin-films is accomplished by interferometric lithography as well as using lithographic masks in liquid phase. Surface Enhanced Raman Spectroscopy and Atomic Force microscopy are used to characterize the model phospholipid membrane and the patterning technique. We describe an easy and reproducible technique for direct patterning of azo-dye (NBD)-labeled phospholipid (phosphatidylcholine) in aqueous medium using a low-intensity 488 nm Ar+ laser and various kinds of lithographic masks.
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