Direct measurements of the colloidal Debye force

Lee, Hyang Mi; Kim, Young Kook; Go, Eun Min; Revadekar, Chetan; Choi, Kyu Hwan; Cho, Yumi; Kwak, Sang Kyu; Park, Bum Jun

doi:10.1038/s41467-023-39561-8

Cited by 9 publications

(4 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Conventional interfacial techniques, such as interfacial rheology, pendant drop measurements or Langmuir methods typically probe changes in lateral structure whereas changes in vertical structure remain undisclosed. Thus, we see an opportunity to develop experimental techniques to directly measure changes in the vertical structure of interfacial monolayers, e.g., liquid phase atomic force microscopy combined with colloidal probes 76 or optical tweezers 77 . It is our hope that our article may trigger further research efforts in these directions.…”

Section: Discussionmentioning

confidence: 99%

Interactions between interfaces dictate stimuli-responsive emulsion behaviour

Rey,

Kolker,

Richards

et al. 2023

Nat Commun

View full text Add to dashboard Cite

Stimuli-responsive emulsions offer a dual advantage, combining long-term storage with controlled release triggered by external cues such as pH or temperature changes. This study establishes that thermo-responsive emulsion behaviour is primarily determined by interactions between, rather than within, interfaces. Consequently, the stability of these emulsions is intricately tied to the nature of the stabilizing microgel particles - whether they are more polymeric or colloidal, and the morphology they assume at the liquid interface. The colloidal properties of the microgels provide the foundation for the long-term stability of Pickering emulsions. However, limited deformability can lead to non-responsive emulsions. Conversely, the polymeric properties of the microgels enable them to spread and flatten at the liquid interface, enabling stimuli-responsive behaviour. Furthermore, microgels shared between two emulsion droplets in flocculated emulsions facilitate stimuli-responsiveness, regardless of their internal architecture. This underscores the pivotal role of microgel morphology and the forces they exert on liquid interfaces in the control and design of stimuli-responsive emulsions and interfaces.

show abstract

Section: Discussionmentioning

confidence: 99%

Interactions between interfaces dictate stimuli-responsive emulsion behaviour

Rey,

Kolker,

Richards

et al. 2023

Nat Commun

View full text Add to dashboard Cite

show abstract

“…Accordingly, at low pH, micron-size objects were observed; however, in the alkaline regime, the radius decreased close to 200 nm. Comparing the mobility and radius data, one can notice that the size of LRD decreased with increasing surface charge, suggesting the absence of larger particle aggregates at high pH, at which strong electrostatic repulsion exists between the surfaces . This can be qualitatively explained by the traditional theory proposed by Derjaguin, Landau, Verwey and Overbeek (DLVO) .…”

Section: Resultsmentioning

confidence: 69%

“…Comparing the mobility and radius data, one can notice that the size of LRD decreased with increasing surface charge, suggesting the absence of larger particle aggregates at high pH, at which strong electrostatic repulsion exists between the surfaces. 44 This can be qualitatively explained by the traditional theory proposed by Derjaguin, Landau, Verwey and Overbeek (DLVO). 34 Accordingly, in a dispersion of charged particles and electrolytes, particle aggregation is suppressed through EDL repulsion and is caused by permanent van der Waals attractions.…”

Section: Resultsmentioning

confidence: 87%

The Impact of Polyphosphates on the Colloidal Stability of Laponite Particles

Katana,

Baptista,

Schneider

et al. 2024

J. Phys. Chem. B

View full text Add to dashboard Cite

The effect of polyphosphate (polyP) adsorption on the colloidal properties of disc-shaped laponite (LRD) particles was examined in aqueous dispersions with a focus on elucidating the interparticle forces that govern the colloidal stability of the systems. The charge and aggregation rate data of bare LRD exhibited an ionic strength-dependent trend, confirming the presence of double-layer repulsion and van der Waals attraction as major surface interactions. The charge of LRD particles significantly increased in magnitude at elevated polyP concentrations as a result of polyP adsorption and subsequent overcharging of the positively charged sites on the edges of the LRD discs. A transition from stable to unstable LRD colloids was observed with increasing polyP doses indicating the formation of aggregates in the latter systems due to depletion forces and/or bridging interactions induced by dissolved or adsorbed polyP, respectively. The degree of phosphate polymerization influenced neither the charge nor the aggregation mechanism. The findings clearly confirm that polyP adsorption was the driving phenomenon to induce particle aggregation in contrast to other clay types, where phosphate derivatives act as dispersion stabilizing agents. This study provides valuable insights into the early stages of aggregation in colloidal systems involving LRD and polyPs, which have a crucial role in predicting further material properties that are important to designing LRD-polyP composites for applications such as potential phosphate sources in chemical fertilizers.

show abstract

“…The results obtained in this work focus the reader's attention on near-field processes specific for Casimir or van der Waals bound nanostructures, 123–128 in particular, transformation in agglomerates of metal nanoparticles in chloride-containing media. This knowledge is important for risk assessment and product development in industry and pharmacology assuming their potential threats to environmental health and safety risks.…”

Section: Discussionmentioning

confidence: 94%