Adsorption kinetics of alkanethiol-capped gold nanoparticles at the hexane–water interface

Thiol anchoring and catalysis of gold nanoparticles at the liquid interface of thin-organic film-modified electrodes

“…2. During the incubation period no other gold nanoparticles could be formed; hence, the strong diminishing of the response is a consequence of ordering and aggregating of the preformed gold nanoparticles at the liquid interface, being in agreement with other findings [20]. This process is quite effective in the presence of the lipophilic Ph 3 SH thiol and cysteine, resulting in almost complete blocking of the liquid interface for the ion transfer reaction (curve 2 in Once immobilized, the gold nanoparticles are an effective catalyst toward the electron transfer across the liquid interface.…”

Assembly of Nanoscale Objects at the Liquid/Liquid Interface

“…This technique is sensitive to the adsorption of particles at the liquid/liquid interface and therefore 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 29 verifies the predictions of size and contact angle dependency and may indicate the stability of the assembly by examining the magnitude of the surface tension change or the time required to reach a minimum. 32,38 Some information about the packing at the interface can also be found by examining the concentration dependence of the surface tension to indicate the amount of particles required to form a monolayer. 38 This has been particularly useful when comparing the assembly of Janus particles with pure particles or examining shape/size dependent stability.…”

“…37 With organic surface groups such as thiols, the reduction in surface energy on assembly at the liquid/liquid interface varies strongly with alkyl chain length as longer chains result in an increase in hydrophobicity, lowering the stability of the particles at the interface. 38 Thiol capped gold nanoparticles offer very good stability in a bulk organic phase. 39 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 13 pH and electrolyte concentration has been shown to enable reversible interfacial assembly of gold nanoparticles.…”

Spatial Distribution of Nanocrystals Imaged at the Liquid-Air Interface

“…For particles of only a few nanometers in size, adsorption to the liquid-gas or liquid-liquid interface can be of order k B T and reversible [8], as for molecular surfactants. To evaluate how strongly nanoparticles adsorb to liquid interfaces, the conventional method is to measure the interfacial tension as a function of particle concentration [9][10][11][12]. However, in the presence of surface-active molecular species, their adsorption will dominate the changes in macroscopic interfacial tension and obscure the effect of adsorbing colloidal nanoparticles.…”