Active interaction switching controls the dynamic heterogeneity of soft colloidal dispersions

Bley, Michael; Hurtado, Pablo I.; Dzubiella, Joachim; Moncho-Jordá, A.

doi:10.1039/d1sm01507a

Cited by 17 publications

(22 citation statements)

References 80 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These studies have mostly considered the active Brownian particle (ABP) model to describe the dynamics, and the fluctuations are incorporated either in self-propulsion velocity or both in thermal and active forces. In another study [43], Bley et. al.…”

Section: Introductionmentioning

confidence: 91%

“…Our model is related to the one in Ref. [43] where a soft colloid diffusing in response to the gradients in chemical potential and/or concentrations switches between two states with different masses due to active interactions.…”

Section: Switching Diffusionmentioning

confidence: 99%

“…Unlike [43], here we consider the motion of a soft active colloid, which means that the dynamics is not only driven by the chemical or/and concentration gradient, but it also moves due to selfpropulsion mechanism fueled by ATP hydrolysis. However, it is interesting to note that both studies capture the non-Gaussian behavior at a shorter timescale, which further emphasizes the fact that the non-Gaussianity is a very common feature associated with a disordered system.…”

Section: Switching Diffusionmentioning

confidence: 99%

“…However, as mentioned earlier, the diffusive motion coupled to an active process is very common in biological systems, though its theoretical study in heterogeneous environment is largely lacking. Inclusion of heterogeneity is important to study the activity-driven systems such as self-propelled particles in the presence of obstacles [42], active soft colloids with switching active interactions [43], runand-tumble disks displaying avalanche dynamics [44], etc. For a detailed account on this topic, the reader is referred to Ref.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Motion of an active particle with dynamical disorder

Goswami,

Chakrabarti

2021

Preprint

View full text Add to dashboard Cite

We propose a model for the motion of a single active particle in a heterogeneous environment where the heterogeneity may arise due to the crowding, conformational fluctuations and/or slow rearrangement of the surroundings. Describing the active particle in terms of the Ornstein-Uhlenbeck process (OUP) and incorporating the heterogeneity in the thermal bath using the two separate models, namely "diffusing diffusivity" and "switching diffusion", we explore the essential dynamical properties of the particle for its one-dimensional motion.In addition, we show how the dynamical behavior is controlled by two timescales, namely diffusive time and persistence time. Our model is relevant in the context of single particle dynamics in crowded environment, driven by activity.

show abstract

Section: Introductionmentioning

confidence: 91%

Section: Switching Diffusionmentioning

confidence: 99%

Section: Switching Diffusionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Motion of an active particle with dynamical disorder

Goswami,

Chakrabarti

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…73,74 These studies have mostly considered the active Brownian particle (ABP) model to describe the dynamics, and the fluctuations are incorporated either in self-propulsion velocity or both in thermal and active forces. In another study, 69 Bley et al have investigated the dynamical properties of a suspension of active colloids where each particle switches randomly between two states differing in their size as well as mobility. It has been shown there that this switching induces non-Gaussian behavior at intermediate times.…”

Section: Introductionmentioning

confidence: 99%

Motion of an active particle with dynamical disorder

Goswami

Chakrabarti

2022

Soft Matter

View full text Add to dashboard Cite

show abstract

Hot Brownian Motion of Thermoresponsive Microgels in Optical Tweezers Shows Discontinuous Volume Phase Transition and Bistability

Fernández-Rodríguez

Orozco‐Barrera

Sun

et al. 2023

Small

View full text Add to dashboard Cite

Microgels are soft microparticles that often exhibit thermoresponsiveness and feature a transformation at a critical temperature, referred to as the volume phase transition temperature. Whether this transformation occurs as a smooth or as a discontinuous one is still a matter of debate. This question can be addressed by studying individual microgels trapped in optical tweezers. For this aim, composite particles are obtained by decorating Poly‐N‐isopropylacrylamide (pNIPAM) microgels with iron oxide nanocubes. These composites become self‐heating when illuminated by the infrared trapping laser, performing hot Brownian motion within the trap. Above a certain laser power, a single decorated microgel features a volume phase transition that is discontinuous, while the usual continuous sigmoidal‐like dependence is recovered after averaging over different microgels. The collective sigmoidal behavior enables the application of a power‐to‐temperature calibration and provides the effective drag coefficient of the self‐heating microgels, thus establishing these composite particles as potential micro‐thermometers and micro‐heaters. Moreover, the self‐heating microgels also exhibit an unexpected and intriguing bistability behavior above the critical temperature, probably due to partial collapses of the microgel. These results set the stage for further studies and the development of applications based on the hot Brownian motion of soft particles.

show abstract

Active interaction switching controls the dynamic heterogeneity of soft colloidal dispersions

Abstract: We employ Reactive Dynamical Density Functional Theory (R-DDFT) and Reactive Brownian Dynamics (R-BD) simulations to investigate the dynamics of a suspension of active soft Gaussian colloids with binary interaction switching,...

Cited by 17 publications

References 80 publications

Motion of an active particle with dynamical disorder

Motion of an active particle with dynamical disorder

Motion of an active particle with dynamical disorder

Hot Brownian Motion of Thermoresponsive Microgels in Optical Tweezers Shows Discontinuous Volume Phase Transition and Bistability

Contact Info

Product

Resources

About