AI Article Synopsis
- A new trisilanol derivative of POSS, trisilanolcyclohexyl-POSS, forms stable monolayers at the air/water interface, showcasing unique phase transitions.
- Through experiments using pi-A isotherm and Brewster angle microscopy, researchers observed that these derivatives transition from single-molecule-thick monolayers to unusual rodlike hydrophobic aggregates in thicker films.
- The stable structure formation is attributed to trisilanolcyclohexyl-POSS's unique molecular characteristics and its strong capacity for intermolecular hydrogen bonding, aligning with existing findings on POSS/polymer composites.
Article Abstract
A trisilanol derivative of polyhedral oligomeric silsesquioxane (POSS), trisilanolisobutyl-POSS, has recently been reported to form stable monolayers at the air/water interface. This paper explores the mono- and multilayer properties of another POSS derivative, trisilanolcyclohexyl-POSS, with pi-A isotherm and Brewster angle microscopy measurements. Results show that with continuously increasing surface concentration via symmetrical compression, trisilanolcyclohexyl-POSS amphiphiles at the air/water interface undergo a series of phase transitions from traditional Langmuir monolayers (one-POSS-molecule thick) to unique rodlike hydrophobic aggregates in multilayer films (approximately eight-POSS-molecules thick) that are dramatically different from "collapsed" morphologies seen in other systems. Stable and hydrophobic rodlike structure formation on water is presumably due to trisilanolcyclohexyl-POSS' unique molecular structure and strong tendency to form intermolecular hydrogen bonds in the solid state. This result is consistent with existing POSS/polymer composite research, which shows that POSS molecules tend to aggregate and crystallize into lamellar nanocrystals.
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