%0 journal article
%@ 0002-7863
%A Angelov, B.,Angelova, A.,Haramus, V.,Lebas, G.,Lesieur, S.,ollivon, M.,Funar, S.,Willumeit, R.,Couvreur, P.

%D 2007
%J Journal of the American Chemical Society
%N 44
%P 13474-13479 
%R doi:10.1021/ja072725+
%T Small-Angle Neutron and X-ray Scattering from Amphiphilic Stimuli-Responsive Diamond-Type Bicontinuous Cubic Phase
%U https://doi.org/10.1021/ja072725+
44 
%X The structural evolution of a diamond-type bicontinuous lipid cubic phase upon application of,thermal and chemical (hydration agent) stimuli is investigated by means of small-angle neutron (SANS),and X-ray scattering (SAXS). The soft-matter cubic architecture responds by dramatic swelling (DLarge cubic structure) upon incorporation of a hydration-enhancing guest component (octyl glucoside) at low and ambient,temperatures, the aqueous channel diameter increasing twice to 7 nm. DLarge appears to be built up from,an assembly of cubosomic domains, which may coexist with an amphiphilic lamellae domain at low,temperatures. The chemical stimulus concentration can be selected as to tune the hydration of the,nanochannels in the DLarge phase and its transformation into a DNormal phase at temperatures above the body temperature. Two-dimensional SANS images recorded upon heating scan reveal growth of,spontaneously oriented domains of single-crystal cubic nature. Phase separation and squeezing out the,guest-hydrating agent from the higher-curvature regions of the amphiphilic bilayer suggest a possible,mechanism for the established transformations. The order-order structural transition, cubic DLarge - cubic DNormal, is found to be reversible upon cooling. The obtained results put forward a structure-based concept,for release of encapsulated guest molecules from stimuli-responsive and self-regulated cubosomic,nanocarriers.