کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
593639 | 1453947 | 2013 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Formation of pyrrolidinium fatty acid soap and its lyotropic liquid crystalline phase behavior Formation of pyrrolidinium fatty acid soap and its lyotropic liquid crystalline phase behavior](/preview/png/593639.png)
• A novel acid-soap has been prepared from a nitrogen-containing heterocyclic compound, pyrrolidine, and fatty acid.
• Two six-membered-ring interacted hydrogen bonds have been speculated to make complex stable.
• The pyrrolidinium fatty acid-soap exhibits amphiphilicity and can construct lamellar LLC phase in water
The hydrogen bond induced acid–soap like complex has been prepared from a nitrogen-containing heterocyclic compound, pyrrolidine, and the myristic acid (MA). The complex composition and the intermolecular actions between two component molecules have been characterized with techniques of nuclear magnetic resonance (NMR), X-ray diffraction (XRD) and Fourier transformation infra-red (FTIR) spectroscopy. The molar ratio between the soap (pyrrolidium myristate, PM) and the acid (MA) is identified as 1:1. As an important driving force of assembly, the existence of hydrogen bond is further confirmed by a molecular mechanics calculation. It is interesting that such an acid–soap complex (PM–MA) exhibits amphiphilicity and its lyotropic liquid crystal phase in water has been observed over a wide concentration range. A lamellar phase structure is established using the polarized optical microscopy (POM) and small-angle X-ray scattering (SAXS) measurements. The change of lattice spacing indicates a typical one-dimensional swelling scheme for the uptake of water by this lamellar phase. The frequency-independent storage and loss module could be found for these lamellar samples by rheological measurements, reflecting a highly viscoelastic nature. The obtained results should add new insights to better understand the structure and aqueous behavior of long-chain fatty acid–soaps with a large size nitrogen-heterocyclic counterion.
The pyrrolidinium fatty acid soaps containing a large size nitrogen-heterocyclic counterion have been prepared. Such an acid–soap complex exhibits well self-assembling properties in water and a lamellar lyotropic liquid crystalline phase has been successfully constructed over a wide concentration range.Figure optionsDownload as PowerPoint slide
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 426, 5 June 2013, Pages 55–62