Proceedings of SerbiaTrib '13

conditions are all quite low. Bathing OTS+50%agent films at a bath temperature of 80 graduallyincreases the contact angle to approximately 105degree. The various reaction time and bathetemperature have extremely little influence on thecontact angle. In summary, the bath temperature of80 ° C and duration time of 12 hours was chosen asoperation condition in order to investigate theantibacterial characteristics of surface film on lenses.Ra (nm)25020015010050LensOTSOTS + 10% agentOTS + 50% agentantibacterial agent absorbed and stored in thetopographic valley of OTS film.The reliability and beauty requirement of thedisplay elements made from company becomeimportant in their service life. The lighttransmittance and film adhesion properties are oneof key performances of lens. In order to explore therelation between surface film and lighttransmittance of lens, Figure 4 shows thattransmittance of OTS film and antibacterial agenton the lens. This result indicates that the OTSsurface film will decrease the light transmittance oflens. However, the antibacterial agent hasextremely little influence on the transmittance oflens. The minimum value of transmittance is 93.6%under the film of OTS + 50% agent. It concludesthat all transmittance of surface films is acceptablefor industrial applications in our work.1200(a)100LensOTSOTS + 10% agentOTS + 50% agentRa=102 nmTransmittance (%)80604020(b)Figure 3. (a)The roughness values of the differentsurface films (b) 3-D topography image of the OTS +50% agent film.The various roughness values of differentsurface materials are shown in Figure. 3.Roughness test were conducted in air at a relativehumidity of about 50% using AFM by non-contactmode. The scanned detection range was 40 µm × 40µm. The various surface roughness value of differentsurface materials are shown in Figure 3(a). Thecomparison chart shows that antibacterial agent candecrease the surface roughness value of pure OTSfilms. The roughness value of OTS film surfaceadding 10% antibacterial agent is approximately 175nm, whereas the OTS film roughness value adding50% antibacterial agent was decreased toapproximately 100 nm. The 3-D topography imagefor the hybrid organic molecules film (OTS + 50%agent) is shown as Figure 3(b). The island-shapedstructures were formed on the surface, as mentionedin Vaillant’s work [8]. It shows hybrid organic filmexhibit uniform coverage the surface with regularpattern of island formation. It indicates thatFigure 4 The light transmittance of differentsurface films on lensThe film adhesion is another one of keyperformances of lens for reliability. Figure 5 showsthe effect of antibacterial agent on the critical loadof surface films on the lens. It shows thatantibacterial agent increases adhesion forcebetween OTS film and lens. Mixing antibacterialagent (50%) in OTS material increases the criticalload to approximately 104N. In summary, thesurface treatment of optical lenses involving OTS+Agent (50%) is the most capable of effectivelyincreasing anti-adhesion functions.In the antibacterial tests, staphylococcus aureuswere inoculated with different self-assembled film,and then after 24 hours to measure bacteria values(JISZ 2801:2010). Figure 6 is the comparison chartof the number of the bacteria for the differentsurface films. For the general lens surface, thebacteria number is about 135000 after 24 hours.The pure OTS film also has little antibacterialfunction. It shows that the bacteria number on OTSwith 50% antibacterial agents and pure antibacterialagent surface is less than 10. It is far lower than thebacteria value, 5.3 × 10 4 , on the OTS film.104 13 th International Conference on Tribology – Serbiatrib’13