Tailoring the ferromagnetic surface potential landscape by a templating two-dimensional metal-organic porous network

Two-dimensional metal-organic porous networks (2D-MOPNs) have been identified as versatile nanoarchitectures to tailor surface electronic and magnetic properties on noble metals. In this context, we propose a protocol to redecorate a ferromagnetic surface potential landscape using a 2D-MOPN. Ultrathin cobalt (Co) films grown on Au(111) exhibit a well-ordered surface triangular reconstruction. On the ferromagnetic surface, the adsorbed 2,4,6-tris(4-pyridyl)-1,3,5triazine (T4PT) molecules can coordinate with the native Co atoms to form a large-scale Co-T4PT porous network. The Co-T4PT network with periodic nanocavities serves as a templating layer to reshape the ferromagnetic surface potential. The subsequently deposited C60 molecules are steered by the network porous potential and the neighboring C60 interactions. The prototype of the ferromagnetic-supported 2D-MOPN is a promising template for the tailoring of molecular electronic and spin properties

Root Surface Roughness after Treatment with Manual Curette and Er:YAG and Er,Cr:YSGG Lasers

Introduction: This study compared the root surface roughness following scaling and root planning with manual curettes and different powers of Er:YAG and Er,Cr:YSGG lasers using surface profilometry and scanning electron microscopy (SEM). Materials and Methods: In this in vitro experimental study, 50 extracted teeth were buccolingually sectioned into two halves. The obtained contaminated surfaces randomly received the following treatments: SRP with manual curettes (group I), Er:YAG laser irradiation (4 W) (group II), manual curette+Er: YAG laser (1W) (group III), manual curette+ Er,Cr:YSGG laser (150 mJ) (group IV) and Er,Cr:YSGG laser (250 mJ) (group V). Surface roughness (Ra), surface changes (Rz) and maximum roughness changes (Rmax) were calculated before and after treatment while the surface morphology was examined by SEM analysis. The differences in roughness parameters were statistically analyzed using Wilcoxon signed rank test for each modality.Results: Except for the manual curette group (I) in which the roughness parameters decreased significantly (P<0.04 for all), Ra, Rz and Rmax increased in the remaining groups. The reported increases in group II (4W Er:YAG)(P<0.005, P<0.007 and P<0.03, respectively) and group V (250 mJ Er,Cr:YSGG) were statistically significant (P<0.01, P<0.05 and P<0.05). Conclusion: Within the limitations of this study, irradiation of Er:YAG and Er,Cr:YSGG lasers at both powers with and without using manual curettes increased surface roughness values compared to using manual curettes alone. Greater roughness values were obtained by increasing the power of lasers