Monolayer-protected metal nanoparticles (NPs) {are not|aren’t|usually are not|will not be|are certainly not|are usually not} only promising {materials|supplies|components} {with a|having a|using a} wide {range of|selection of|array of} {potential|possible|prospective} industrial and biological applications, {but they|however they} are also a {powerful|potent|effective|strong|highly effective} tool to investigate the behavior of matter at nanoscopic scales, {including|such as|which includes|like} the stability of dispersions and colloidal systems. This stability is dependent on a delicate balance {between|in between|among|amongst|involving} electrostatic and steric interactions that {occur|happen|take place} {in the|within the|inside the} {solution|answer|remedy|resolution|option}, and {it is|it’s|it really is|it truly is|it can be|it is actually} described in quantitative terms by the classic Derjaguin-Landau-Vewey-Overbeek (DLVO) theory, that posits that aggregation {between|in between|among|amongst|involving} NPs is driven by hydrophobic interactions and opposed by electrostatic interactions. To investigate the limits of this theory {at the|in the} nanoscale, {where|exactly where} the continuum assumptions {required|needed|necessary|essential|expected} by the DLVO theory break down, {here|right here} we investigate NP dimerization by computing the {Potential|Possible|Prospective} of {Mean|Imply} Force (PMF) of this {process|procedure|method|approach|course of action} {using|utilizing|making use of|employing|working with|applying} {fully|totally|completely} atomistic MD simulations. Serendipitously, we {find|discover|locate|uncover|come across|obtain} that electrostatic interactions can {lead to|result in|bring about|cause} the formation of metastable NP dimers. These dimers are stabilized by complexes formed by negatively charged ligands belonging to distinct NPs {that are|which are|which can be|which might be|that happen to be} bridged by positively charged ions present in {solution|answer|remedy|resolution|option}. We validate our findings by collecting tomographic EM {images|pictures|photos} of NPs in {solution|answer|remedy|resolution|option} and by quantifying their radial distribution function, that shows a marked peak at interparticle distance comparable with that of MD simulations. Taken {together|with each other|collectively}, our {results|outcomes|final results|benefits} {suggest|recommend} that {not only|not just|not merely|not simply} hydrophobic interactions, {but also|but additionally|but in addition} electrostatic interactions, contribute to attraction {between|in between|among|amongst|involving} nano-sized charged objects at {very|extremely|really|quite|incredibly|pretty} {short|brief|quick} length scales. 9-Aminononan-1-ol site Buy362522-50-7 PMID:35991869
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