The observed effect is equivalent to a virtual “cooling” of floating monolayer, which undergoes rapid condensation on a surface of aqueous colloid. The adsorption of gold nanoparticles on the mixed monolayer led to an increase of interactions between oppositely charged surfactants giving a “soap” of mixed fatty salt. Here, we present some of the novel features and applica- tions associated with this versatile yet powerful system to characterise surfaces and interfaces and how it can trans- form your understanding of the nature of materials in the emerging fields of nano-bio and material describe a new type of colloidal 2D gels formed in mixed Langmuir monolayers of stearic acid and octadecylamine on a surface of gold hydrosol. This technology has been specifically tailored, via its SPR-scanning mode and multi-wavelength optical configuration, to present a whole new level of understanding in biophysical and biomaterial studies through its ability to analyse biophysical events, such as layer thickness and density (Refractive Index) associated with layer-by-layer surface deposition, ranging from ultra- thin nano- (0.5 – 100 nm) and thick-layer (300 nm – microns) systems. Technology and delivering new opportunities to study the physical events involved both in the formation and proper- ties of hard and soft layers and the interfacial behaviour of these layers with each other in solid, liquid and gaseous environments. Multi-Parametric Surface Plasmon Resonance (MP-SPR) redefines the capabilities associated with traditional SPR, broadening the scope of what can be achieved with this
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