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Issue 43, 2008
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Self-assembly of gelators confined within the nano-scale interlayer space of organo-montmorillonite

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Abstract

The self-assembly of low molecular weight gelators confined within the nano-scale interlayer space of organo-montmorillonite is likely to be different from that under normal conditions (bulk space). Four kinds of gelators, 1-methyl-2,4-bis(N′-n-octadecylureido) benzene (MBB18), 1-methyl-2,4-bis(N′-n-dodecylureido)benzene (MBB12), bis(4′-stearamido phenyl) methane (BSM18) and bis(4′-octanamido phenyl)methane (BOM8), were used to investigate gelation of organic solvents confined within the nano-scale interlayer space of organo-montmorillonite. The possible morphologies of these gelators aggregates confined within the nano-scale space of organo-montmorillonite will be discussed in comparison with that in bulk space by employing differential scanning calorimetry (DSC) and X-ray diffraction (XRD). Herein, two types of organogels were prepared under the same conditions. One of them was formed within the interlayer space of organo-montmorillonite and another was formed in bulk space. The XRD patterns confirm that self-assembly of gelators takes place via an unusual pathway within the confined interlayer space of organo-montmorillonite, indicating that the alkyl chains of gelators adopt a parallel arrangement and do not insert into each other. This unusual arrangement of gelators confined within the interlayer space of organo-montmorillonite does lead to the different thermal effect observed by the DSC measurements. These features ultimately strengthen the thermodynamic stability of gelator aggregates, for example MBB18, and raise the gel-to-sol transition temperature, which jumps from 60 to 123 °C.

Graphical abstract: Self-assembly of gelators confined within the nano-scale interlayer space of organo-montmorillonite

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Publication details

The article was received on 04 Aug 2008, accepted on 03 Sep 2008 and first published on 25 Sep 2008


Article type: Communication
DOI: 10.1039/B813525H
Phys. Chem. Chem. Phys., 2008,10, 6479-6482

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    Self-assembly of gelators confined within the nano-scale interlayer space of organo-montmorillonite

    Y. Xiong, Z. Li, G. Feng, H. Wang, H. Xu, X. Yang and Y. Yang, Phys. Chem. Chem. Phys., 2008, 10, 6479
    DOI: 10.1039/B813525H

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