Covalent molecular assembly of multilayer dendrimer ultrathin films in supercritical medium

Covalent Layer‐by‐Layer Assembly Using Reactive Polymers

“…Examples of amide-bond-forming reactions that have proved particularly useful for covalent LbL assembly include reactions between amine-functionalized agents and building blocks functionalized with (i) anhydrides [66][67][68][69][70][71][72][73], (ii) acid chlorides [81,82], (iii) activated esters (e.g., polymers bearing reactive pentafluorophenyl ester groups) [74][75][76][77], and, in the presence of a carbodiimide coupling agent, (iv) carboxylic acids [78][79][80]. The reactivity of anhydride and acid chloride functionalities generally restricts the first two of these approaches to the use of aprotic organic solvents and film components that do not contain other protic groups that could lead to unwanted side reactions.…”

Dendrimer-encapsulated Pt nanoparticles in supercritical medium: Synthesis, characterization, and application to device fabrication

“…Finally, the column was flushed with pure SCCO 2 for 2 h before depressurization. To avoid deprotonation, the dendrimer solution in methanol was mixed with DMAc and the resulting solution was injected immediately into the SCCO 2 medium [36].…”

“…We have also investigated the formation of covalently bonded, multilayered, dendrimer-containing ultrathin films and formation of Cu, Au, and Pd-Pt, Fe-Ni nanoparticles within the thin film matrix using SCCO 2 as a processing medium and also demonstrated their applications in tribology [36][37][38][39].…”

Covalent molecular assembly in supercritical carbon dioxide: Formation of nanoparticles in immobilized dendrimers within a porous silica gel matrix

“…The films formed in SCF medium were mechanically and thermally more stable than those formed in N,N-dimethylacetamide. We have also investigated the formation of covalently bonded, multilayered, dendrimer-containing ultrathin films and formation of Cu, Au, Fe, Pd, Ni, Pd/Pt and Fe/Ni nanoparticles within the thin film matrix using SCCO 2 as a processing medium [22][23][24][25].…”