The Effect of Cysteamine, a Divalent-Like Molecule on Polar Head Groups in DPPC Model Membranes a Spin Label, DSC and Turbidimetry Study

Berleur, François; Roman, V. K.; Jaskierowicz, Donald; Leterrier, F; Fatome, M.

doi:10.1007/978-1-4615-7981-6_32

Cited by 1 publication

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“…Therefore, at the low linker concentration, we did not observe any pivoting of end-to-end NR assemblies into side-to-side assemblies, even after extended imaging (Supporting Information, section 16). When the concentration of linkers is high, the excess cysteamine molecules provide the divalent counterions 67 that screen the NR charge and hence reduce the Coulombic repulsion 56 (Supporting Information, section 12). Consequently, at a high linker concentration, NRs can approach and contact each other via both their ends and sides, which is why two different pathways exist for the side-to-side assembly mode.…”

Section: Resultsmentioning

confidence: 99%

Interactions and Attachment Pathways between Functionalized Gold Nanorods

2017

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Nanoparticle (NP) self-assembly has been recognized as an important technological process for forming ordered nanostructures. However, the detailed dynamics of the assembly processes remain poorly understood. Using in situ liquid cell transmission electron microscopy, we describe the assembly modes of gold (Au) nanorods (NRs) in solution mediated by hydrogen bonding between NR-bound cysteamine linker molecules. Our observations reveal that by tuning the linker concentration, two different NR assembly modes can be achieved. These assembly modes proceed via the (1) end-to-end and (2) side-to-side attachment of NRs at low and high linker concentrations in solution, respectively. In addition, our time-resolved observations reveal that the side-to-side NR assemblies can occur through two different pathways: (i) prealigned attachment, where two Au NRs prealign to be parallel prior to assembly, and (ii) postattachment alignment, where two Au NRs first undergo end-to-end attachment and pivot around the attachment point to form the side-to-side assembly. We attributed the observed assembly modes to the distribution of linkers on the NR surfaces and the electrostatic interactions between the NRs. The intermediate steps in the assembly reported here reveal how the shape and surface functionalities of NPs drive their self-assembly, which is important for the rational design of hierarchical nanostructures.

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Section: Resultsmentioning

confidence: 99%