Surface and Interface Properties of Lauroyl Sarcosinate Adsorbed CP+-Montmorillonite

S. YAPAR; G. ÖZDEMIR; A.M. FERNÁNDEZ SOLARTE; R.M. TORRES SANCHEZ

CLAYS AND CLAY MINERALS

CLAY MINERALS SOC

Lugar: illinois; Año: 2015 vol. 63 p. 110 - 118

0009-8604

Catanionic surfactant systems are very interesting with highly specific applications, such as drug delivery vehicles, or nanocompartments for the formation of biomaterials and nanosized particles. Clay minerals are tailor made materials compatible with organic tissues and also have biomedical applications. The scope of this work is to combine the properties of catanionic surfactant and clay mineral to get a new material with potential use in medicine, waste water treatment, and antibacterial applications. The surfactants chosen, to attain the catanionic surfactant, were cetylpyridinium (CP) and lauroylsarcosinate (SR), which have a strong interaction in an aqueous medium and cause specific aggregations like ion pair amphiphiles (IPA) and needle and leaf like structures. Aside from the aqueous solution, new ternary systems will be formed with different structures and properties by the addition of montmorillonite (Mnt). The surface and interlayer structures of the different Mnt-CP-SR samples prepared by using CP and SR in amounts equal to various ratios of cationic exchange capacity (CEC) of the clay mineral were studied. They were also compared with the structured surfactant aggregates formed in an aqueous media. The Mnt-CP-SR samples were subjected to XRD, TG analyses, and Zeta potential measurements to elucidate the interlayer and external surface structures, respectively. The XRD analyses showed the formation of a compact structure in the gallery region resulting from the interaction between randomly oriented pyridinium and negatively charged SR head groups. The triple interactions among the Mnt surface, CP, and SR were more complex than the double interactions between the Mnt and cationic surfactant, and the CP played a dominant role in the formation of external and interlayer surface structures regardless of the amount and order of the addition of SR. The new findings will introduce new applications of organoclays in the fields of biomedicine, remediation of polluted water and nano composite materials.