Last week saw the publication in PloS One of Quy Khac Ong and Francesco Stellacci’s response to Stirling et al “Critical Assessment of the Evidence for Striped Nanoparticles” published a year earlier (November 2014, I am one of the co-authors).
The controversy had started with our publication of Stripy Nanoparticles Revisited after a three year editorial process (2009-2012) and was followed by a large number of events at this blog, on PubPeer and a few other places.
Here is a short statement in response to Ong and Stellacci. Since theirs was a response to Stirling et al, Julian Stirling was invited to referee their submission (report).
We are pleased that Ong and Stellacci have responded to our paper, Critical assessment of the evidence for striped nanoparticles, PLoS ONE 9 e108482 (2014). Each of their rebuttals of our critique has, however, already been addressed quite some time ago either in our original paper, in the extensive PubPeer threads associated with that paper (and its preprint arXiv version), and/or in a variety of blog posts. Indeed, arguably the strongest evidence against the claim that highly ordered stripes form in the ligand shell of suitably-functionalised nanoparticles comes from Stellacci and co-authors’ own recent work, published shortly after we submitted our PLOS ONE critique. This short and simple document compares the images acquired from ostensibly striped nanoparticles with control particles where, for the latter (and as claimed throughout the work of Stellacci et al.), stripes should not be present. We leave it to the reader to draw their own conclusions. At this point, we believe that little is to be gained from continuing our debate with Stellacci et al. We remain firmly of the opinion that the experimental data to date show no evidence for formation of the “highly ordered” striped morphology that has been claimed throughout the work of Stellacci and co-workers, and, for the reasons we have detailed at considerable length previously, do not find the counter-claims in Ong and Stellacci in any way compelling. We have therefore clearly reached an impasse. It is thus now up to the nanoscience community to come to its own judgement regarding the viability of the striped nanoparticle hypothesis. As such, we would very much welcome STM studies from independent groups not associated with any of the research teams involved in the controversy to date. For completeness, we append below the referee reports which JS submitted on Ong and Stellacci’s manuscript.
Julian Stirling, Raphaël Lévy, and Philip Moriarty November 16 2015