Tuning the self-assembled monolayer formation on nanoparticle surfaces with different curvatures: Investigations on spherical silica particles and plane-crystal-shaped zirconia particles

Abstract

Graphical abstractAmorphous spherical silica and plane-crystal-shaped zirconia particles were prepared and functionalized with long alkyl chain coupling agents. The effect of the nanoscopic curvature and the co-functionalization with a second coupling agent was investigated.Highlights► Alkyl-chain ordering on curved and plane nanoscopic surfaces. ► Disturbing self-assembled monolayer formation on nanoparticles by co-functionalization. ► Improvement of the dispersion behavior of nanoparticles by co-functionalization of their surface.

Refitting of Zirconia Toughening into Open-Cellular Alumina Foams by Infiltration with Zirconyl Nitrate

“…However, from the dynamic light-scattering (DLS) measurements on these ZrO(NO 3 ) 2 solutions a significant influence of the H 3 O + concentration on the size of the zirconium species being present in the respective solution was found (Figure 3 and Table 2). For ZrO(NO 3 ) 2 dissolved in demineralized water an average size of the solute species of 8 nm was measured by DLS, which is in good accord to sol particles of a condensed zirconium oxygen species [49]. In contrast thereto, the mean solute diameter in solutions of ZrO(NO 3 ) 2 in 1 mol∙L −1 and 2 mol∙L −1 HNO 3 , respectively, is 1 nm, indicating a significantly lower degree of aggregation.…”

Directing Alkyl Chain Ordering of Functional Phosphorus Coupling Agents on ZrO2

“…Recently, this work (i.e., comodification) was extended in our group to ZrO 2 nanoparticles, showing this to be an effective approach to direct alkyl chain ordering on ZrO 2 surfaces. 29 This method allows for gradually variably tuning the ordering of nonfunctional alkyl chains by the simple addition of a defined amount of concurring P-CA, which inhibits the self-assembly processes. In the current work, methylphosphonic acid (MPA) and phenylphosphonic acid (PPA) were chosen as concurrent agents and their influence on the alkyl chain ordering of MC6-PO 3 and MC11-PO 3 was monitored.…”

Click Coupling Reactions on Flat and Nanostructured Hydrogen‐Passivated Silicon Surfaces

“…We suggest that similar to the compound 2–3 , the inhomogeneous morphology and concave surface geometry of porous silicon hampers the monolayer alignment and enables compound 5 to bind with both terminal alkyne groups to the substrate. Strong correlations between nanosized curvatures and the ability to form high quality monolayer have been reported previously . In addition, differences in surface chemistry between the silicon substrates seems like a possible factor that could influence the back‐bonding.…”

“…Strong correlations between nanosized curvatures and the ability to form high quality monolayer have been reported previously. [36,37] In addition, differences in surface chemistry between the silicon substrates seems like a possible factor that could influence the back-bonding. Variations in the reaction mechanisms of light induced hydrosilylation reactions have previously been reported as well as SiC formation on porous silicon at low temperatures.…”