Capillarity can be used to direct anisotropic colloidal particles precise locations and orient them by using interface curvature as an applied field. We show this in experiments which the shape of is molded pinning vertical pillars different cross-sections. These interfaces present well-defined fields that steer along complex trajectories. Trajectories orientations are predicted a theoretical model capillary forces torques related Gaussian gradients angular deviations from principal...

Micro and nanoparticle adsorption to assembly by capillarity at fluid–fluid interfaces are intriguing aspects of soft matter science with broad potential in the directed anisotropic media. The importance field stems from ubiquitous presence multiphase systems, malleability fluid interfaces, ability tune interactions particles adsorbed on them. While homogeneous spherical have been well studied, behavior – whether anisotropy originates shape or chemical heterogeneity has considered only very...

Magnetically driven robots can perform complex functions in biological settings with minimal destruction. However, designed to damage deleterious biostructures could also have important impact. In particular, there is an urgent need for new strategies eradicate bacterial biofilms as we approach a post-antibiotic era. Biofilms are intractable and firmly attached structures ubiquitously associated drug-resistant infections destruction of surfaces. Existing treatments inadequate both kill...

Abstract Candida albicans is frequently detected with heavy infection of Streptococcus mutans in plaque-biofilms from children affected early-childhood caries, a prevalent and costly oral disease. The presence C. enhances S. growth within biofilms, yet the chemical interactions associated bacterial accumulation remain unclear. Thus, this study was conducted to investigate how microbial products cross-kingdom association modulate build-up biofilms. Our data revealed that bacterial-fungal...

To exploit the size dependent properties of nanoparticles, it is essential to control particle size. We show that injection octanethiol into suspensions ZnO particles can be used quench growth. X-ray photoelectron spectroscopy studies adsorption on single crystals indicate relatively weak thiolate and sulfonate species crystal orientation. These results suggest groups in suspension prevent dissolution solid phase. Furthermore, adsorbed sufficiently strongly growth but easily removed for...

The shape of the absorbance edge for a suspension semiconductor quantum particles is influenced both by electronic transition and distribution band gaps in system. Using suitable model to relate absorption energy particle radius, we demonstrate this relationship inferring size from spectrum ZnO particles, comparing it obtained transmission electron microscope images. This analysis broadly applicable suspensions many II−VI or III−V compound semiconductors.

Drop breakup in a linear extensional flow is simulated numerically using nonlinear model for the surface tension that accounts maximum packing at interface. Surface convection sweeps surfactant to drop poles, where it accumulates and drives near zero. The assumes transient shape with highly pointed tips. From these tips, thin liquid threads are pulled. Subsequently, small, surfactant-rich droplets emitted from termini of threads. scale shed drops depends on initial coverage. Dilute coverage...

Evaporating drops provide a means of organizing particles suspended within them. Here, the manner in which surfactants alter these patterns is studied as function surface state an insoluble monolayer at drop interface. The visualized throughout evolution using fluorescence microscopy. A regime surfactant coverage identified that creates conditions enhance Marangoni-Bénard instability. This result was not anticipated prior studies, are predicted to prevent this These data demonstrate that, by...

The creation of complex materials may be aided by advanced colloidal assembly methods involving anisotropically shaped particles.

In this research, we study cylindrical microparticles at fluid interfaces. Cylinders orient and assemble with high reliability to form end-to-end chains in dilute surfaces or dense rectangular lattices crowded owing capillary interactions. isolation, a cylinder assumes one of two possible equilibrium states, the end-on state, which axis is perpendicular interface, side-on parallel interface. A phase diagram relating aspect ratio contact angle constructed predict preferred state verified...

Continuous generation of hierarchical and asymmetric bijels based on solvent-transfer-induced phase separation (STRIPS) is demo­nstrated. In STRIPS, induced by solvent extraction from an initially homogeneous ternary mixture, bicontinuous morphology stabilized inter­facial attachment nano­particles, which are functionalized in situ. STRIPS allows stable bijel formation a wide variety liquids particles. As service to our authors readers, this journal provides supporting information supplied...

Cell migration is crucial for both physiological and pathological processes. Current in vitro cell motility assays suffer from various drawbacks, including insufficient temporal and/or optical resolution, or the failure to include a controlled chemotactic stimulus. Here, we address these limitations with chamber that utilizes self-sustaining gradient induce locomotion through confined environments emulate settings. Dynamic real-time analysis of population-scale single-cell movement are...

Janus particles are colloidal analogues of molecular amphiphiles that can self-assemble to form diverse suprastructures, exhibit motility under appropriate catalytic reactions, and strongly adsorb fluid–fluid interfaces stabilize multiphasic fluid mixtures. The chemistry is the fundamental parameter controls their behavior utility as colloid surfactants in bulk solution at interfaces. To enable widespread utilization, scalable methods allow for synthesis with chemical compositions shapes...

The decoration of porous membranes with a dense layer nanoparticles imparts useful functionality and can enhance membrane separation anti-fouling properties. However, manufacturing nanoparticle-coated requires multiple steps tedious processing. Here, we introduce facile single-step method in which bicontinuous interfacially jammed emulsions are used to form nanoparticle-functionalized hollow fiber membranes. resulting nanocomposite prepared via solvent transfer-induced phase...

In vivo, cells respond to a host of physical cues ranging from substrate stiffness the organization micro- and nanoscale fibrous networks. We show that macroscale substrates with radii curvature tens hundreds micrometers influence cell alignment. model system fibroblasts, isolated aligned strongly in axial direction on cylinders similar length more weakly much larger radius. Isolated vascular smooth muscle did not align as effectively fibroblasts. However, both types robustly weak fields...

The shape of a drop centered in an axisymmetric extensional flow is determined by the viscous stresses that deform and surface tension γ′ resists deformation. ratio these given capillary number, Ca. When Ca small enough, attains steady shape. However, above threshold value, Cacr, elongates continuously, no attained. surfactants are present on interface, concentration profile, which varies throughout deformation process. Initially, γeq′, equilibrium with uniform Γeq′. initiated, surfactant...

Drops containing suspended particles are placed on surfaces of patterned wettability created using soft lithography; the drop diameter is large compared to dimensions patterns substrate. As three-phase contact line recedes, spontaneous dewetting hydrophobic domains and flow into hydrophilic create discrete fluid elements with peripheries that can mimic underlying surface topography. Suspended carried wetted regions deposit there as evaporate. If particle volume fractions sufficiently high,...

The insoluble surfactant pentadecanoic acid is spread at the interface of aqueous droplets, which are then deposited on a well-defined substrate and allowed to evaporate. surface state imaged as drop evaporates using fluorescence microscopy, mean rate evaporation calculated from successive digitized silhouettes sessile drops. drops contain suspended microspheres that act tracers in flow within deposit patterns vary with state. Patterns observed include circular mounds particles original...

The optical absorbance spectrum for a suspension of quantum particles with an arbitrary particle size distribution is determined by the electronic transition and bandgaps in system. It demonstrated that obtained ZnO excellent agreement from transmission electron microscope images.

Surfactant molecules adsorb onto the interfaces of moving fluid particles and are convected to regions in which surface flow converges. Accumulation surfactant these creates interfacial tension gradients that retard flow. In this study it is argued theoretically demonstrated experimentally movement on a drop or bubble can remain unhindered presence single adsorbed if, relative convective rate transport along surface, desorption fast, bulk concentration high enough so diffusion away from...

A drop in an axisymmetric extensional ow is studied using boundary integral methods to understand the effects of a monolayer-forming surfactant on strongly deforming interface. Surfactants occupy area, so there upper bound surface concentration that can be adsorbed monolayer, Γ ∞ . The tension highly nonlinear function because this bound. As result, mechanical response system varies with for realistic material parameters. In work, insoluble considered limit where and external fluid...

We study the slow withdrawal of a partially wet vertical plate at velocity U from suspension well-wet particles. Periodic horizontal striped assemblies form spontaneously three-phase contact line on energetically uniform surfaces. Stripe width and spacing depend relative to transition Ut. Thick stripes separated by large spaces for U<Ut. For U>Ut, thin small form. The stripe is reduced an order magnitude varies weakly with until maximum reached which fail A surface can entrain meniscus....