Surface and bulk interactions of organic molecules with calixarene layers

Acoustic Wave Sensors

“…Cavitand-coated sensors have been exposed to gas phase vapors and responses have been observed [200][201][202][203][204][205][206][207][208][209][210][211]. In some experiments, the sensors were exposed to brief pulses of vapors, such that steady state responses were not obtained, and the cavitand layer did not come to thermodynamic equilibrium with the gas phase vapor concentration.…”

“…Guest molecules including acetone, dichloromethane, and fluorobenzene were all found to reside among pendant alkyl chains. Determination of the location of sorbed molecules in cavitand films requires that independent techniques be applied, and recent studies have reported experiments to address this issue [203,210,215].…”

“…It has been observed that cavitand-coated sensors respond to a great variety of vapors, rather than responding solely to those vapors with an ideal "fit" [200][201][202][203][204][205][206][207][208][209][210][211]216]. Thus, the promise of compound specific sensors has not been achieved by this approach.…”

Haloform adsorption on crystalline copolymer films of vinylidene fluoride with trifluoroethylene

“…As with bromoform adsorption on ice [9,10] and chloroform adsorption on calixarene [23] layers, dipole interactions between the adsorbate and substrate may play a key role in the interaction energetics. Strong adsorbate intermolecular interactions with the substrate may also play a role in dipole alignment of the bromoform.…”

“…Chloroform (CHCl 3 ) adsorption on calixarene molecular films has been studied [23], but bromoform (CHBr 3 ) adsorption on the copolymer polyvinylidene fluoride with trifluoroethylene, P(VDFTrFE 70:30) provides a better opportunity to study dipole interactions as this substrate is a ferroelectric polymer [24][25][26][27] with well ordered surface dipoles below 290 K [27][28][29]. Water ice is not generally considered a ferroelectric, although the water dipoles can order, so dipolar interactions cannot a priori be excluded.…”