Publications by authors named "Catherine E Farmer-Creely"
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 Synopsis
- Brewster angle microscopy reveals that octaisobutyl-POSS, a nonamphiphilic nanofiller, consistently forms aggregates at the air/water interface, regardless of its surface concentration.
- Blending this nonamphiphilic POSS with amphiphilic PDMS at concentrations above 10 wt % significantly reduces the aggregation of POSS, demonstrated through thermodynamic analyses and morphological studies.
- The research identifies three composition regimes based on POSS concentration: high (>70 wt %) leading to unstable isotherms and large rigid domains, moderate (40-70 wt %) with PDMS-like features and extensive POSS networks, and low (≤30 wt %) resembling pure PDMS with small POSS clusters.
Article Synopsis
- A trisilanol derivative of POSS, trisilanolisobutyl-POSS, can form stable monolayers at the air/water interface, undergoing a structural transition at a specific surface pressure.
- The study uses techniques like the Wilhelmy plate and Brewster angle microscopy to analyze the behavior of POSS at the surface, revealing that surface pressure is influenced by compression rate and temperature.
- Results indicate that the formation of solidlike domains and the relaxation processes of these domains lead to various morphologies, which could inform the design of POSS/polymer blends for coating applications.
Insoluble films of trisilanolisobutyl-POSS and octaisobutyl-POSS at the air/water interface are investigated by means of surface pressure - area per molecule isotherm (Pi - A) and Brewster angle microscopy (BAM). Analysis of the experimental results shows the partial cage molecule, trisilanolisobutyl-POSS, is a surface-active molecule that self-assembles into uniform monolayer upon compression; but the fully condensed cage molecule, octaisobutyl-POSS, is nonamphiphilic.
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