3 research outputs found
Resolving the Growth of 3D Colloidal Nanoparticle Superlattices by Real-Time Small-Angle X‑ray Scattering
The kinetics and intricate interactions governing the
growth of
3D single nanoparticle (NP) superlattices (SLs, SNSLs) and binary
NP SLs (BNSLs) in solution are understood by combining controlled
solvent evaporation and <i>in situ</i>, real-time small-angle
X-ray scattering (SAXS). For the iron oxide (magnetite) NP SLs studied
here, the larger the NP, the farther apart are the NPs when the SNSLs
begin to precipitate and the closer they are after ordering. This
is explained by a model of NP assembly using van der Waals interactions
between magnetite cores in hydrocarbons with a ∼21 zJ Hamaker
constant. When forming BNSLs of two different sized NPs, the NPs that
are in excess of that needed to achieve the final BNSL stoichiometry
are expelled during the BNSL formation, and these expelled NPs can
form SNSLs. The long-range ordering of these SNSLs and the BNSLs can
occur faster than the NP expulsion
Resolving the Growth of 3D Colloidal Nanoparticle Superlattices by Real-Time Small-Angle X‑ray Scattering
The kinetics and intricate interactions governing the
growth of
3D single nanoparticle (NP) superlattices (SLs, SNSLs) and binary
NP SLs (BNSLs) in solution are understood by combining controlled
solvent evaporation and <i>in situ</i>, real-time small-angle
X-ray scattering (SAXS). For the iron oxide (magnetite) NP SLs studied
here, the larger the NP, the farther apart are the NPs when the SNSLs
begin to precipitate and the closer they are after ordering. This
is explained by a model of NP assembly using van der Waals interactions
between magnetite cores in hydrocarbons with a ∼21 zJ Hamaker
constant. When forming BNSLs of two different sized NPs, the NPs that
are in excess of that needed to achieve the final BNSL stoichiometry
are expelled during the BNSL formation, and these expelled NPs can
form SNSLs. The long-range ordering of these SNSLs and the BNSLs can
occur faster than the NP expulsion
Resolving the Growth of 3D Colloidal Nanoparticle Superlattices by Real-Time Small-Angle X‑ray Scattering
The kinetics and intricate interactions governing the
growth of
3D single nanoparticle (NP) superlattices (SLs, SNSLs) and binary
NP SLs (BNSLs) in solution are understood by combining controlled
solvent evaporation and <i>in situ</i>, real-time small-angle
X-ray scattering (SAXS). For the iron oxide (magnetite) NP SLs studied
here, the larger the NP, the farther apart are the NPs when the SNSLs
begin to precipitate and the closer they are after ordering. This
is explained by a model of NP assembly using van der Waals interactions
between magnetite cores in hydrocarbons with a ∼21 zJ Hamaker
constant. When forming BNSLs of two different sized NPs, the NPs that
are in excess of that needed to achieve the final BNSL stoichiometry
are expelled during the BNSL formation, and these expelled NPs can
form SNSLs. The long-range ordering of these SNSLs and the BNSLs can
occur faster than the NP expulsion