The Role of Modifying Molecular Chains in the Formation of Organized Molecular Films of Organo-Modified Nanodiamond: Construction of a Highly Ordered Low Defect Particle Layer and Evaluation of Desorption Behavior of Organic Chains

Abstract

The role of organo-modifying molecular chains in the formation of molecular films of organo-modified nanodiamond is discussed herein based on interfacial chemical particle integration of organo-modified nanodiamond having a particle size of 5 nm. The surface of nanodiamond is known to be covered with a nanolayer of adsorbed water. This water nanolayer was exploited for organo-modification of nanodiamond with long-chain fatty acids via adsorption, leading to nanodispersion of nanodiamond in general organic solvents as a mimic of solvency. The organo-modified nanodiamond dispersed "solution" was used as a spreading solution for depositing a mono-"particle" layer on the water surface, and a Langmuir particle layer was integrated at the air/water interface. Multi-"particle" layers were then formed via the Langmuir-Blodgett technique and were subjected to fine structural analysis. The effect of organo-modification enabled integration and multilayer formation of inorganic nanoparticles due to enhancement of the van der Waals interactions between the chains. That is to say, the "encounter" between the organo-modifying chain and the inorganic particles led to solubilization of the inorganic particles and enhanced interactions between the particles, which can be regarded as imparting new function to the organic molecules. The morphology of the single-particle layer was maintained after removal of the organic region of the composite via the baking process, whereas the regularity of the layered period was disordered. Thus, the organic chains are essential as modifiers for maintenance of the layered structure.

Effects of sonochemical treatment on meteoritic nanodiamonds

“…It was recently shown that formation of a suitable hydrophilic covering may drastically change behavior even of individual nanodiamond grains (Fujimori et al. ). Therefore, nanodiamond grains attracted to the walls of the bubbles will experience more intense action of temperature and aggressive chemistry of the cavitating bubbles than the grains residing in the liquid bulk.…”

“…However, variations in hydrophilicity of the ND grains may influence the effect of the sonochemistry by several interrelated ways: heterogeneous distribution of the grains and/or their clusters between the liquid bulk and surfaces of the pre-existing and newly formed bubbles (e.g., Johnson and Cooke 1981). It was recently shown that formation of a suitable hydrophilic covering may drastically change behavior even of individual nanodiamond grains (Fujimori et al 2015). Therefore, nanodiamond grains attracted to the walls of the bubbles will experience more intense action of temperature and aggressive chemistry of the cavitating bubbles than the grains residing in the liquid bulk.…”

Preparation of Polymer‐Based Nanocomposites Composed of Sustainable Organo‐Modified Needlelike Nanoparticles and Their Particle Dispersion States in the Matrix

“…Therefore, the adsorbed water nanolayer on the sepiolite in the reaction system was also positively charged and capable of electrostatic interactions with the phosphonate anions. Dispersions were prepared by combining an aqueous solution of sepiolite with a methanolic solution of ODP or FDP (the detailed organo‐modification procedure of sepiolite was presented elsewhere ). Toluene was then poured into the sepiolite dispersion while it was stirred, and the organo‐sepiolite particles migrated from the methanolic dispersion into the toluene phase.…”

“…For example, simple and highly efficient surface modification methods have been applied to nanodiamonds , montmorillonite clay , zirconia , zinc oxide nanodisks , magnetic fine particles , and carbon nanotubes at the oil–water interface. The resultant organo‐modified nanofillers were nanodispersed not only in a polymer matrix but also into organic solvents , indicating their amphiphilic properties .…”

Topological “interfacial” polymer chemistry: Dependency of polymer “shape” on surface morphology and stability of layer structures when heating organized molecular films of cyclic and linear block copolymers ofn-butyl acrylate-ethylene oxide

“…However, regularity of layer structure in LB film is generally high, studies on polymer nanosheet and clay nanosheets dealing with this ordering are very famous. Work has also been reported on studies of novel polymer nanosheets supported by π–π interactions between carbazole groups, polymer nanosphere‐layer structures, and layered organizations of organo‐modified‐inorganic nanoparticles . In addition, changes in hydrophobic chain lengths caused by heating have also been investigated as a disordering process effect.…”