Plasma activated nitrogen

However, the nitrogen molecule has afar greater bonding energy than ammonia and is more difficult to dissociate into free atomic nitrogen active species. Consequently, the deposition rate is extremely slow. This can be offset by plasma activation with high frequency (13.56 MHz) or electron cyclotron resonance (ECR) plasmasP Ef l and with micro-wave activation. 

The formally identical synthesis of HCN from active nitrogen and methane has been extensively studied (4, 9, 12) for more than a half century. That the systems are different is apparent, for the high-voltage discharge is a high excitation device, whereas the plasma jet is thought to be nearly in local thermal equilibrium and hence a low excitation... 

Cotton samples required no pre-treatment. Glass slides were ultrasonicated for 30 min in a 10% solution of deconex 11 UNIVERSAL (Borer Chemie AG, Switzerland) at 50°C, rinsed with deionized water and dried under a nitrogen flow. Aluminum samples were ultrasonicated in chloroform for 30 min and rinsed with deionized water. A laboratory plasma machine Femto from Diener Electronic (Germany) was used for plasma activation of PDMS and aluminum substrates using oxygen as process gas. After the plasma activation the substrates were rinsed with water and dried in a nitrogen stream. The activated substrates were used immediately. 

Phospholipids. Phospholipids, components of every cell membrane, are active determinants of membrane permeabiUty. They are sources of energy, components of certain enzyme systems, and involved in Hpid transport in plasma. Because of their polar nature, phosphoUpids can act as emulsifying agents (42). The stmcture of most phosphoUpids resembles that of triglycerides except that one fatty acid radical has been replaced by a radical derived from phosphoric acid and a nitrogen base, eg, choline or serine. 

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