Spontaneous Self-Organization via Cation Exchange in Fatty Acid Films Immersed in Aqueous Media

A low-temperature, soft chemistry method for the synthesis of zirconia nanoparticles in thermally evaporated fatty amine thin films

“…4 shows the XRD pattern recorded from a 250-Å-thick ODA film on Si (111) substrate after entrapment of ZrF 2− 6 ions. The diffraction pattern shows sharp Bragg (0 0 l) reflections with a characteristic odd-even intensity oscillation that is symptomatic of lamellar c-axis ordering of the zirconium ions in the ODA matrix [27]. From the separation between the (0 0 l) Bragg reflections, the bilayer thickness in the ODA-ZrF 2− 6 composite was calculated to be ca.…”

“…This may be accomplished in two ways. In the first method, metal ions may be entrapped in thermally evaporated lipid films [27] and thereafter reduced/chemically treated to yield metal or metal sulfide nanoparticles within the lipid matrix. This approach has been used with success in the growth of patterned assemblies of nanoparticles of gold [28], silver [29], and CdS quantum dots [30] on a variety of solid supports.…”

Nanoparticle Organization at the Air‐Water Interface and in Langmuir‐Blodgett Films

“…This section is concluded by mentioning a new method developed in my laboratory for realizing nanoparticles in lipid bilayer structures very similar to that obtained by chemical reaction of LB films of metal salts of fatty lipids. We have 12.2 Nanoparticle Assembly at the Air-Water Interface 391 shown that thermally evaporated films of fatty acids (arachidic acid, for example) on solid supports when immersed in suitable electrolyte solutions such as CdCl 2 / PbCl 2 resulted in electrostatic entrapment of the metal ions in the lipid matrix and their spontaneous organization into a lamellar c-axis-oriented structure very similar to that observed for LB films of cadmium/lead arachidate [128]. Chemical treatment of these lamellar lipid films with entrapped metal ions would lead to the formation of nanoparticles as outlined above for LB films with the important advantage that patterned lipid films can be deposited by thermal evaporation, such patterning being almost impossible to achieve by the LB method.…”

Immobilization of biogenic gold nanoparticles in thermally evaporated fatty acid and amine thin films

“…From a commercial and application point of view, it is clear that our protocol leading to the extracellular synthesis of nanoparticles by fungi [10] or parts of whole plants [11] would be of greater general interest provided the biogenic nanoparticles in solution could be immobilized and assembled on suitable solid surfaces or within different host matrices. Some of us have developed a versatile technique that uses thermally evaporated films of ionizable lipid molecules such as fatty acids and amines in the immobilization of charged species such as inorganic ions [12,13], surface-modified charged nanoparticles [14,15], and biomacromolecules such as proteins [16,17] and DNA [18,19].…”