In Situ Observation of a Self-Assembled Monolayer Formation of Octadecyltrimethoxysilane on a Silicon Oxide Surface Using a High-Speed Atomic Force Microscope

Abstract

High-speed AFM measurements: High-speed AFM measurements were performed on a Research Institute of Biomolecule Metrology (Tsukuba, Ibaraki, Japan) Nano Explorer Highspeed Atomic Force Microscope with an Olympus (Tokyo, Japan) BL-AC10FS cantilever. A Si(100) substrate was cut into 2x2 mm 2 pieces, and the surface of each piece was oxidized by using a UV ozone cleaner. After the substrate was immersed in SAMLAY ® -A with a volume of 120 L, topographical images were collected every 2 sec with a frame size of 3x3 m 2 by the AC mode.

Enhanced flux in direct contact membrane distillation using superhydrophobic PVDF nanofibre membranes embedded with organically modified SiO2 nanoparticles

“…35,36 Self-assembled monolayers of ODTS, OTMS and Cl-DMOS on SiO 2 surfaces has been reported previously. 26,27,36 Although the determination of the additional layer formation was not conducted, the increase in size of the SiO 2 NPs as observed on TEM micrographs upon modification using the silane reagents indicated the formation of an additional layer as suggested by others. 26,27,36 wileyonlinelibrary.com/jctb…”

“…M4 is the PVDF nanofibre membrane embedded with OTMS‐modified SiO 2 NPs. The OTMS molecule is characterized by a long aliphatic carbon chain (CH 3 (CH 2 ) 17 ‐ as in the case of other silane agents (ODTS and Cl‐DMOS), although their anchor functional groups are different: on OTMS it is (‐Si‐OCH 3 ) 3 , on ODTS it is (‐Si‐ClCH 2 ) 3 and on Cl‐DMOS it is (‐Si‐Cl 3 ) 3 . The anchor groups on OTMS are more hydrophobic due to the presence of bulky nonpolar CH 3 groups.…”

The oscillatory adsorption of self‐assembled organosilane films on aluminium oxide surfaces

“…Indeed, this notion has been reported in literature before. For instance, an in situ study by Iwasa etal using AFM has observed morphological behaviour showing islands growing from a nucleation site on the surface with minimal surface bonds and further supports the proposed mechanisms that are thought to underpin the oscillatory behaviour observed here.…”

A review of nanoparticle‐enhanced membrane distillation membranes: membrane synthesis and applications in water treatment

“…The OTMS molecule is characterized by a long aliphatic carbon chain (CH 3 (CH 2 ) 17 ‐) where the anchor group is (‐Si‐OCH 3 ) 3 . Furthermore, the anchor groups on ODTS and Cl‐DMOS are (‐Si‐ClCH 2 ) 3 and (‐Si‐Cl 3 ) 3 , respectively . The anchor groups on OTMS are more hydrophobic due to the presence of bulky non‐polar CH 3 groups.…”

“…Furthermore, the anchor groups on ODTS and Cl-DMOS are (-Si-ClCH 2 ) 3 and (-Si-Cl 3 ) 3 , respectively. [68][69][70][71][72][73][74] The anchor groups on OTMS are more hydrophobic due to the presence of bulky non-polar CH 3 groups. The presence of strong electron withdrawing atoms such as chlorine and oxygen in Cl-DMOS and ODTS cause an uneven distribution of electrons, which could subsequently induce a minimal polarity on one end of the molecule, and slightly reduce its hydrophobicity.…”