Document Detail


Amino acid based low-molecular-weight ionogels as efficient dye-adsorbing agents and templates for the synthesis of TiO(2) nanoparticles.
MedLine Citation:
PMID:  20020516     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The gelation of ionic liquids is attracting significant attention because of its large spectrum of applications across different disciplines. These 'green solvents' have been the solution to a number of common problems due to their eco-friendly features. To expand their applications, the gelation of ionic liquids has been achieved by using amino acid-based low-molecular-weight compounds. Variation of individual segments in the molecular skeleton of the gelators, which comprise the amino acid and the protecting groups at the N and C termini, led to an understanding of the structure-property correlation of the ionogelation process. An aromatic ring containing amino acid-based molecules protected with a phenyl or cyclohexyl group at the N terminus were efficient in the gelation of ionic liquids. In the case of aliphatic amino acids, gelation was more prominent with a phenyl group as the N-terminal protecting agent. The probable factors responsible for this supramolecular association of the gelators in ionic liquids have been studied with the help of field-emission SEM, (1)H NMR, FTIR, and luminescence studies. It is the hydrophilic-lipophilic balance that needs to be optimized for a molecule to induce gelation of the green solvents. Interestingly, to maximize the benefits from using these green solvents, these ionogels have been employed as templates for the synthesis of uniform-sized TiO(2) nanoparticles (25-30 nm). Furthermore, as a complement to their applications, ionogels serve as efficient adsorbents of both cationic and anionic dyes and were distinctly better relative to their organogel counterparts.
Authors:
Sounak Dutta; Dibyendu Das; Antara Dasgupta; Prasanta Kumar Das
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Chemistry (Weinheim an der Bergstrasse, Germany)     Volume:  16     ISSN:  1521-3765     ISO Abbreviation:  Chemistry     Publication Date:  2010 Feb 
Date Detail:
Created Date:  2010-02-03     Completed Date:  2010-03-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9513783     Medline TA:  Chemistry     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1493-505     Citation Subset:  IM    
Affiliation:
Department of Biological Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.
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MeSH Terms
Descriptor/Qualifier:
Adsorption
Amino Acids / chemistry*
Coloring Agents
Gels / chemical synthesis*,  chemistry
Green Chemistry Technology
Hydrogen Bonding
Ionic Liquids
Molecular Structure
Nanoparticles
Nanotechnology
Titanium / chemistry*
Chemical
Reg. No./Substance:
0/Amino Acids; 0/Coloring Agents; 0/Gels; 0/Ionic Liquids; 13463-67-7/titanium dioxide; 7440-32-6/Titanium

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