Biofunctionalized nanocolloids offer a promising platform for creation of novel materials using bio-addressable interactions. Crystalline phases are of especial interest for the development of novel functional structures. We demonstrate that crystallization of nanocolloids can be achieved via hybridization of dispersed non-complementary single stranded DNA capped colloids with flexible single-stranded linker DNA. The crystalline structure belongs to body central cubic lattice and exhibits large thermal expansion. The evolution of the structure has been studied in details using in-situ small angle x-ray scattering. The formation of crystalline structures and reduced metastability are observed for systems with longer DNA linkers.
[Show abstract][Hide abstract] ABSTRACT: DNA-functionalized gold nanoparticles can be used to induce the formation and control the unit cell parameters of highly ordered face-centered cubic crystal lattices. Nanoparticle spacing increases linearly with longer DNA interconnect length, yielding maximum unit cell parameters of 77 nm and 0.52% inorganic-filled space for the DNA constructs studied. In general, we show that longer DNA connections result in a decrease in the overall crystallinity and order of the lattice due to greater conformational flexibility.
[Show abstract][Hide abstract] ABSTRACT: The phase diagram of DNA linker mediated nanoparticle assemblies was experimentally investigated and constructed. Using small angle x-ray scattering we studied the dependence of the internal structure of assembly on two main system parameters: DNA linker length and the number of linkers per particle. The formation of a crystalline bcc phase was observed for a limited range of linker lengths, while the number of linkers per particle controlled the onset of system crystallization. The influence of linkage defects on crystalline structure was also examined.
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