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Title: Insight into the permeation selectivity of calix[n]arene-based Langmuir-Blodgett films: Importance of headgroup association and the solid phase

Abstract

This paper reports the design and synthesis of 5,11,17,23,29,35-hexaacetyl-37,38,39,40,41,42-hexakis(1-hexadecyloxy)calix[6]arene (2) and 5,11,17,23-tetraamideoxime-25,26,27,28-tetrakis(1-hexadecyloxy)calix[4]arene (3), plus a detailed comparison of the membrane properties of corresponding Langmuir-Blodgett films with those assembled from 5,11,17,23,29,35-hexaamideoxime-37,38,39,40,41,42-hexakis(1-hexadecyloxy)calix[6]arene (1a). Surface pressure-area isotherms that were recorded for 1a and 2 over a pure water subphase at 25 C showed significant hysteresis that was eliminated after two compression-expansion cycles; the limiting area in both cases was ca. 162 {angstrom}{sup 2}/molecule. In sharp contrast, 3 showed no hysteresis at 25 C and a limiting area of 107 {angstrom}{sup 2}/molecule. Careful examination of the dependence of surface viscosity on temperature has provided compelling evidence for a solid-analogous to liquid-analogous phase transition occurring at 31 and 28 C for monolayers of 1a and 2, respectively. Permeation measurements that were made across Langmuir-Blodgett (LB) films [four monolayers supported on poly-[1-(trimethylsilyl)-1-propyne] with respect to helium and nitrogen] revealed high selectivity in the case of 1a and much lower selectivity with 2 and 3 at ambient (21--23 C) temperatures. The implications of these findings, in terms of the further development of LB films as membranes for gas separations, are briefly discussed.

Authors:
; ; ; ; ;  [1]
  1. Lehigh Univ., Bethlehem, PA (United States)
Publication Date:
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
316324
DOE Contract Number:  
FG02-85ER13403
Resource Type:
Journal Article
Journal Name:
Langmuir
Additional Journal Information:
Journal Volume: 14; Journal Issue: 22; Other Information: PBD: 27 Oct 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; AROMATICS; PERMEABILITY; THIN FILMS; MEMBRANES; SEPARATION EQUIPMENT; SYNTHESIS; MEMBRANE TRANSPORT; HELIUM; NITROGEN

Citation Formats

Hendel, R A, Zhang, L H, Janout, V, Conner, M D, Hsu, J T, and Regen, S L. Insight into the permeation selectivity of calix[n]arene-based Langmuir-Blodgett films: Importance of headgroup association and the solid phase. United States: N. p., 1998. Web. doi:10.1021/la9806496.
Hendel, R A, Zhang, L H, Janout, V, Conner, M D, Hsu, J T, & Regen, S L. Insight into the permeation selectivity of calix[n]arene-based Langmuir-Blodgett films: Importance of headgroup association and the solid phase. United States. doi:10.1021/la9806496.
Hendel, R A, Zhang, L H, Janout, V, Conner, M D, Hsu, J T, and Regen, S L. Tue . "Insight into the permeation selectivity of calix[n]arene-based Langmuir-Blodgett films: Importance of headgroup association and the solid phase". United States. doi:10.1021/la9806496.
@article{osti_316324,
title = {Insight into the permeation selectivity of calix[n]arene-based Langmuir-Blodgett films: Importance of headgroup association and the solid phase},
author = {Hendel, R A and Zhang, L H and Janout, V and Conner, M D and Hsu, J T and Regen, S L},
abstractNote = {This paper reports the design and synthesis of 5,11,17,23,29,35-hexaacetyl-37,38,39,40,41,42-hexakis(1-hexadecyloxy)calix[6]arene (2) and 5,11,17,23-tetraamideoxime-25,26,27,28-tetrakis(1-hexadecyloxy)calix[4]arene (3), plus a detailed comparison of the membrane properties of corresponding Langmuir-Blodgett films with those assembled from 5,11,17,23,29,35-hexaamideoxime-37,38,39,40,41,42-hexakis(1-hexadecyloxy)calix[6]arene (1a). Surface pressure-area isotherms that were recorded for 1a and 2 over a pure water subphase at 25 C showed significant hysteresis that was eliminated after two compression-expansion cycles; the limiting area in both cases was ca. 162 {angstrom}{sup 2}/molecule. In sharp contrast, 3 showed no hysteresis at 25 C and a limiting area of 107 {angstrom}{sup 2}/molecule. Careful examination of the dependence of surface viscosity on temperature has provided compelling evidence for a solid-analogous to liquid-analogous phase transition occurring at 31 and 28 C for monolayers of 1a and 2, respectively. Permeation measurements that were made across Langmuir-Blodgett (LB) films [four monolayers supported on poly-[1-(trimethylsilyl)-1-propyne] with respect to helium and nitrogen] revealed high selectivity in the case of 1a and much lower selectivity with 2 and 3 at ambient (21--23 C) temperatures. The implications of these findings, in terms of the further development of LB films as membranes for gas separations, are briefly discussed.},
doi = {10.1021/la9806496},
journal = {Langmuir},
number = 22,
volume = 14,
place = {United States},
year = {1998},
month = {10}
}