Nanochannel design by molecular imprinting on a free-standing ultrathin titania membrane

Shigenori Fujikawa, Emi Muto, Toyoki Kunitake

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A free-standing ultrathin film of a poly(vinyl alcohol) (PVA)/titania (TiO2) composite was prepared by spin coating. The thickness of the film was adjusted to 30-50 nm by changing the spin-coating speed and the concentrations of PVA and the TiO2 precursor. A template molecule, (4-phenylazo)benzoic acid (4PABA), was introduced into the film as a mixture in the TiO2 precursor and was removed after film formation by dipping the film in aq NH3 (1%). Aqueous solutions of tetraphenylporphyrin tetrasulfonic acid (TPPS), 4PABA, and sodium benzoate (SB) were filtered through this film, and the concentrations of these compounds in the filtered solution were monitored by UV-vis absorption measurements. The filtered TPPS solution was colorless, and its absorbance at 413 nm was 8% that of the original solution. In contrast, almost 100% of SB and 28.4% of 4PABA were passed through the film. The ultrathin TiO2/PVA film obtained without imprinting with 4PABA had no cavities, and aqueous solutions did not pass through this film. Therefore, it was concluded that the nonimprinted film was defect free and that imprinting of the template molecule in the film resulted in the formation of a size-selective channel across a 40 nm thickness.

Original languageEnglish
Pages (from-to)11563-11568
Number of pages6
JournalLangmuir
Volume25
Issue number19
DOIs
Publication statusPublished - Oct 6 2009
Externally publishedYes

Fingerprint

titanium
Titanium
membranes
Membranes
Benzoic Acid
Benzoic acid
benzoic acid
Sodium Benzoate
Spin coating
coating
Sodium
titanium dioxide
templates
sodium
aqueous solutions
Molecules
Acids
Ultrathin films
acids
dipping

All Science Journal Classification (ASJC) codes

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy

Cite this

Nanochannel design by molecular imprinting on a free-standing ultrathin titania membrane. / Fujikawa, Shigenori; Muto, Emi; Kunitake, Toyoki.

In: Langmuir, Vol. 25, No. 19, 06.10.2009, p. 11563-11568.

Research output: Contribution to journalArticle

Fujikawa, Shigenori ; Muto, Emi ; Kunitake, Toyoki. / Nanochannel design by molecular imprinting on a free-standing ultrathin titania membrane. In: Langmuir. 2009 ; Vol. 25, No. 19. pp. 11563-11568.
@article{99f430715374476db0d66d2e74663ea1,
title = "Nanochannel design by molecular imprinting on a free-standing ultrathin titania membrane",
abstract = "A free-standing ultrathin film of a poly(vinyl alcohol) (PVA)/titania (TiO2) composite was prepared by spin coating. The thickness of the film was adjusted to 30-50 nm by changing the spin-coating speed and the concentrations of PVA and the TiO2 precursor. A template molecule, (4-phenylazo)benzoic acid (4PABA), was introduced into the film as a mixture in the TiO2 precursor and was removed after film formation by dipping the film in aq NH3 (1{\%}). Aqueous solutions of tetraphenylporphyrin tetrasulfonic acid (TPPS), 4PABA, and sodium benzoate (SB) were filtered through this film, and the concentrations of these compounds in the filtered solution were monitored by UV-vis absorption measurements. The filtered TPPS solution was colorless, and its absorbance at 413 nm was 8{\%} that of the original solution. In contrast, almost 100{\%} of SB and 28.4{\%} of 4PABA were passed through the film. The ultrathin TiO2/PVA film obtained without imprinting with 4PABA had no cavities, and aqueous solutions did not pass through this film. Therefore, it was concluded that the nonimprinted film was defect free and that imprinting of the template molecule in the film resulted in the formation of a size-selective channel across a 40 nm thickness.",
author = "Shigenori Fujikawa and Emi Muto and Toyoki Kunitake",
year = "2009",
month = "10",
day = "6",
doi = "10.1021/la9014916",
language = "English",
volume = "25",
pages = "11563--11568",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "19",

}

TY - JOUR

T1 - Nanochannel design by molecular imprinting on a free-standing ultrathin titania membrane

AU - Fujikawa, Shigenori

AU - Muto, Emi

AU - Kunitake, Toyoki

PY - 2009/10/6

Y1 - 2009/10/6

N2 - A free-standing ultrathin film of a poly(vinyl alcohol) (PVA)/titania (TiO2) composite was prepared by spin coating. The thickness of the film was adjusted to 30-50 nm by changing the spin-coating speed and the concentrations of PVA and the TiO2 precursor. A template molecule, (4-phenylazo)benzoic acid (4PABA), was introduced into the film as a mixture in the TiO2 precursor and was removed after film formation by dipping the film in aq NH3 (1%). Aqueous solutions of tetraphenylporphyrin tetrasulfonic acid (TPPS), 4PABA, and sodium benzoate (SB) were filtered through this film, and the concentrations of these compounds in the filtered solution were monitored by UV-vis absorption measurements. The filtered TPPS solution was colorless, and its absorbance at 413 nm was 8% that of the original solution. In contrast, almost 100% of SB and 28.4% of 4PABA were passed through the film. The ultrathin TiO2/PVA film obtained without imprinting with 4PABA had no cavities, and aqueous solutions did not pass through this film. Therefore, it was concluded that the nonimprinted film was defect free and that imprinting of the template molecule in the film resulted in the formation of a size-selective channel across a 40 nm thickness.

AB - A free-standing ultrathin film of a poly(vinyl alcohol) (PVA)/titania (TiO2) composite was prepared by spin coating. The thickness of the film was adjusted to 30-50 nm by changing the spin-coating speed and the concentrations of PVA and the TiO2 precursor. A template molecule, (4-phenylazo)benzoic acid (4PABA), was introduced into the film as a mixture in the TiO2 precursor and was removed after film formation by dipping the film in aq NH3 (1%). Aqueous solutions of tetraphenylporphyrin tetrasulfonic acid (TPPS), 4PABA, and sodium benzoate (SB) were filtered through this film, and the concentrations of these compounds in the filtered solution were monitored by UV-vis absorption measurements. The filtered TPPS solution was colorless, and its absorbance at 413 nm was 8% that of the original solution. In contrast, almost 100% of SB and 28.4% of 4PABA were passed through the film. The ultrathin TiO2/PVA film obtained without imprinting with 4PABA had no cavities, and aqueous solutions did not pass through this film. Therefore, it was concluded that the nonimprinted film was defect free and that imprinting of the template molecule in the film resulted in the formation of a size-selective channel across a 40 nm thickness.

UR - http://www.scopus.com/inward/record.url?scp=70349929687&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=70349929687&partnerID=8YFLogxK

U2 - 10.1021/la9014916

DO - 10.1021/la9014916

M3 - Article

C2 - 19788216

AN - SCOPUS:70349929687

VL - 25

SP - 11563

EP - 11568

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 19

ER -