Merck
  • Home
  • Search Results
  • Photoreversible polymer-surfactant micelles using the molecular recognition of α-cyclodextrin.

Photoreversible polymer-surfactant micelles using the molecular recognition of α-cyclodextrin.

Langmuir : the ACS journal of surfaces and colloids (2013-02-05)
Zhen-Qiang Dong, Ya Cao, Xiao-Juan Han, Min-Min Fan, Qi-Juan Yuan, Yi-Fu Wang, Bang-Jing Li, Sheng Zhang
ABSTRACT

Photoreversible micelles were achieved by a combination of commercially available components sodium alginate (Alg), tetradecyltrimethylammonium bromide (TTAB), α-cyclodextrin (α-CD), and 4-(phenylazo)benzoic acid (PBA). Under visible light irradiation, α-CD interacted more favorably with PBA than with alkyl chains of TTAB. Therefore, polymer-surfactant micelles were formed by the self-assembly of Alg and TTAB through electrostatic attraction. After UV irradiation, micelles were disrupted because PBA in the cis form lost its ability to complex with α-CD, and then the latter was interacted with TTAB to prevent the association of alkyl chains of TTAB. On alternating irradiation of this quaternary system with UV and visible light, this reversible micellization process can be recycled many times.

MATERIALS
Product Number
Brand
Product Description

Supelco
Benzoic acid, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
α-Cyclodextrin, Produced by Wacker Chemie AG, Burghausen, Germany, Life Science, 98.0-101.0% cyclodextrin basis (HPLC)
Sigma-Aldrich
α-Cyclodextrin, produced by Wacker Chemie AG, Burghausen, Germany, ≥99.0% (HPLC)
Supelco
Melting point standard 121-123°C, analytical standard
Sigma-Aldrich
Benzoic acid, meets analytical specification of Ph. Eur., BP, USP, FCC, E210, 99.5-100.5% (alkalimetric)
Sigma-Aldrich
Myristyltrimethylammonium bromide, 98% (AT)
Supelco
Myristyltrimethylammonium bromide, suitable for ion pair chromatography, LiChropur, ≥99.0% (AT)
Sigma-Aldrich
Benzoic acid, purified by sublimation, ≥99%
Sigma-Aldrich
Benzoic acid, natural, ≥99.5%, FCC, FG
Sigma-Aldrich
Benzoic acid, ≥99.5%, FCC, FG
Sigma-Aldrich
Benzoic acid, ReagentPlus®, 99%
Supelco
Benzoic acid, certified reference material for titrimetry, certified by BAM, ≥99.5%
Sigma-Aldrich
Benzoic acid, puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99.9% (alkalimetric)
Sigma-Aldrich
α-Cyclodextrin, purum, ≥98.0% (HPLC)
Sigma-Aldrich
Potassium benzoate, ReagentPlus®, 99%
Sigma-Aldrich
Benzoic acid, ACS reagent, ≥99.5%
Sigma-Aldrich
Myristyltrimethylammonium bromide, ≥99%
Sigma-Aldrich
α-Cyclodextrin, powder, BioReagent, suitable for cell culture, ≥98%
Sigma-Aldrich
α-Cyclodextrin, ≥98%
Sigma-Aldrich
Benzoic acid, SAJ first grade, ≥99.5%
Sigma-Aldrich
Benzoic acid, SAJ special grade, ≥99.5%
Supelco
Benzoic acid, Standard for quantitative NMR, TraceCERT®
Sigma-Aldrich
Trimethyl-tetradecylammonium chloride, ≥98.0% (AT)
Supelco
SS Benzoic Acid, 2000 μg/mL in dichloromethane, analytical standard
Supelco
Mettler-Toledo Calibration substance ME 18555, Benzoic acid, analytical standard, for the calibration of the thermosystem 900, traceable to primary standards (LGC)