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Themed collection Soft Matter Lectureship Winners

50 items
Opinion

Solid capillarity: when and how does surface tension deform soft solids?

This Opinion highlights important outstanding questions in the deformation of soft solid interfaces.

Graphical abstract: Solid capillarity: when and how does surface tension deform soft solids?
From the themed collection: Soft Matter Lectureship Winners
Emerging Area

Microrheology of biomaterial hydrogelators

Small sample volumes, a large dynamic response and short acquisition times make microrheology important for characterizing emerging biomaterial hydrogelators.

Graphical abstract: Microrheology of biomaterial hydrogelators
From the themed collection: Soft Matter Lectureship Winners
Open Access Review Article

Nanoemulsions: formation, properties and applications

Nanoemulsions are kinetically stable liquid-in-liquid dispersions with droplet sizes on the order of 100 nm.

Graphical abstract: Nanoemulsions: formation, properties and applications
From the themed collection: Soft Matter Lectureship Winners
Review Article

DNA compaction: fundamentals and applications

We describe the physico-chemical aspects of reversible DNA compaction and its applications in gene regulation, DNA protection and nanostructure fabrication.

Graphical abstract: DNA compaction: fundamentals and applications
From the themed collection: Soft Matter Lectureship Winners
Review Article

A fresh look at the Laponite phase diagram

We review the state diagram of Laponite suspensions in the light of recent experimental and theoretical activity. Multiple non-ergodic states, dominated by either attraction or repulsion, are identified as well as a nematic phase.

Graphical abstract: A fresh look at the Laponite phase diagram
From the themed collection: International Soft Matter Conference 2010
Tutorial Review

Traction force microscopy in physics and biology

We review diverse applications of traction force microscopy and provide detailed instructions, including computer code, for performing it.

Graphical abstract: Traction force microscopy in physics and biology
From the themed collection: Soft Matter Lectureship Winners
Open Access Communication

3D printing of self-assembling thermoresponsive nanoemulsions into hierarchical mesostructured hydrogels

Spinodal decomposition and phase transitions are viable methods to generate a variety of bicontinuous materials. Here, we use 3D printing in conjunction with colloidal self-assembly to create mesostructured hydrogels with tunable micron-sized networks. The rheological properties of the ink and appropriate choice of the photoinitiator are key to printing high fidelity structures.

Graphical abstract: 3D printing of self-assembling thermoresponsive nanoemulsions into hierarchical mesostructured hydrogels
From the themed collection: Soft Matter Lectureship Winners
Paper

Effects of polymer–nanoparticle interactions on the viscosity of unentangled polymers under extreme nanoconfinement during capillary rise infiltration

Extreme nanoconfinement increases polymer viscosity and glass transition temperature significantly, whereas polymer–nanoparticle interactions have little influence.

Graphical abstract: Effects of polymer–nanoparticle interactions on the viscosity of unentangled polymers under extreme nanoconfinement during capillary rise infiltration
From the themed collection: Soft Matter Lectureship Winners
Paper

Multiple particle tracking study of thermally-gelling nanoemulsions

We demonstrate that, by tailoring the MPT probe surface chemistry, we can control the residence of probes in each domain in thermally-gelling nanoemulsions, thus allowing us to independently probe each phase at rising temperatures.

Graphical abstract: Multiple particle tracking study of thermally-gelling nanoemulsions
From the themed collection: Soft Matter Lectureship Winners
Paper

Nanoconfinement greatly speeds up the nucleation and the annealing in single-DNA collapse

Manipulating and measuring single-molecule dynamics and reactions in nanofluidics is a rapidly growing field with broad applications in developing new biotechnologies, understanding nanoconfinement effects in vivo, and exploring new phenomena in confinement.

Graphical abstract: Nanoconfinement greatly speeds up the nucleation and the annealing in single-DNA collapse
From the themed collection: Soft Matter Lectureship Winners
Paper

Effective potentials induced by self-assembly of patchy particles

Effective colloid–colloid interactions can be tailored through the addition of a complex cosolute.

Graphical abstract: Effective potentials induced by self-assembly of patchy particles
From the themed collection: Soft Matter Lectureship Winners
Paper

Hybrid colloidal microswimmers through sequential capillary assembly

Hybrid colloidal microswimmers of programmable shape and composition are prepared by sequential capillary assembly and their modes of motion and functionality are characterized.

Graphical abstract: Hybrid colloidal microswimmers through sequential capillary assembly
From the themed collection: Soft Matter Lectureship Winners
Paper

High-density equilibrium phases of colloidal ellipsoids by application of optically enhanced, direct current electric fields

Highly dense equilibrium assemblies of colloidal ellipsoids having three-dimensional order and packing fraction upto 67%.

Graphical abstract: High-density equilibrium phases of colloidal ellipsoids by application of optically enhanced, direct current electric fields
From the themed collection: Soft Matter Lectureship Winners
Paper

Tracking particles with large displacements using energy minimization

We describe a method to track particles undergoing large displacements.

Graphical abstract: Tracking particles with large displacements using energy minimization
From the themed collection: Soft Matter Lectureship Winners
Paper

Maximum likelihood estimations of force and mobility from single short Brownian trajectories

We introduce a new method to extract force and diffusion profiles from short, single trajectories of Brownian particles, even when the dynamical parameters vary spatially.

Graphical abstract: Maximum likelihood estimations of force and mobility from single short Brownian trajectories
From the themed collection: Soft Matter Lectureship Winners
Paper

Effect of internal architecture on microgel deformation in microfluidic constrictions

Through experiments and simulations, we show how microparticle internal structure controls particle deformation during flow through microfluidic constrictions.

Graphical abstract: Effect of internal architecture on microgel deformation in microfluidic constrictions
From the themed collection: Soft Matter Lectureship Winners
Paper

Compression of hard core–soft shell nanoparticles at liquid–liquid interfaces: influence of the shell thickness

Hard core-soft shell nanoparticles show a rich structural behavior under compression when confined at a fluid interface and present crucial differences to fully deformable hydrogel particles.

Graphical abstract: Compression of hard core–soft shell nanoparticles at liquid–liquid interfaces: influence of the shell thickness
From the themed collection: Soft Matter Lectureship Winners
Paper

Particle detachment from fluid interfaces: theory vs. experiments

Theory and experiments show that the contact angles of microspheres at oil–water interfaces can be accurately extracted from AFM force–distance curves.

Graphical abstract: Particle detachment from fluid interfaces: theory vs. experiments
From the themed collection: Soft Matter Lectureship Winners
Open Access Paper

Mechanical properties of the superficial biofilm layer determine the architecture of biofilms

Cells in biofilms sense and interact with their environment through the extracellular matrix.

Graphical abstract: Mechanical properties of the superficial biofilm layer determine the architecture of biofilms
From the themed collection: Soft Matter Lectureship Winners
Open Access Paper

Translocation dynamics of knotted polymers under a constant or periodic external field

Knotted polymers can ratchet through pores under a periodic force if the cycle time and knot relaxation time are comparable.

Graphical abstract: Translocation dynamics of knotted polymers under a constant or periodic external field
From the themed collection: Soft Matter Lectureship Winners
Paper

Isostructural solid–solid phase transition in monolayers of soft core–shell particles at fluid interfaces: structure and mechanics

We investigated the 2D phase diagram of core–shell microgels by simultaneous compression and deposition from a fluid interface and discovered a solid–solid isostructural transition between two hexagonal phases.

Graphical abstract: Isostructural solid–solid phase transition in monolayers of soft core–shell particles at fluid interfaces: structure and mechanics
From the themed collection: Soft Matter Lectureship Winners
Paper

Controlling and predicting droplet size of nanoemulsions: scaling relations with experimental validation

In this article, we propose and validate a scaling relation to predict the dependence of nanoemulsion droplet size with physical properties such as viscosity of the droplet phase and continuous phase, and process parameters such as input power density.

Graphical abstract: Controlling and predicting droplet size of nanoemulsions: scaling relations with experimental validation
From the themed collection: Soft Matter Lectureship Winners
Open Access Paper

Celebrating Soft Matter's 10th Anniversary: Sequential phase transitions in thermoresponsive nanoemulsions

We combine confocal microscopy and rheological characterization to show that both percolation and liquid–gas phase separation are dynamically arrested states that support elastic stresses in a colloidal gel.

Graphical abstract: Celebrating Soft Matter's 10th Anniversary: Sequential phase transitions in thermoresponsive nanoemulsions
From the themed collection: Soft Matter Lectureship Winners
Paper

Kinetics of colloidal deposition, assembly, and crystallization in steady electric fields

We quantify and model the deposition and crystallization kinetics of initially dilute colloidal spheres due to application of a steady, direct current electric field in the thin gap between parallel electrodes.

Graphical abstract: Kinetics of colloidal deposition, assembly, and crystallization in steady electric fields
From the themed collection: Soft Matter Lectureship Winners
Open Access Paper

Stretching self-entangled DNA molecules in elongational fields

Initially self-entangled DNA molecules exhibit drastically different stretching behavior compared to identical molecules without self-entanglements.

Graphical abstract: Stretching self-entangled DNA molecules in elongational fields
From the themed collection: Soft Matter Lectureship Winners
Paper

Surface tension and the mechanics of liquid inclusions in compliant solids

We reformulate Eshelby's theory of composites to account for interfacial tension.

Graphical abstract: Surface tension and the mechanics of liquid inclusions in compliant solids
From the themed collection: Soft Matter Lectureship Winners
Paper

On polydispersity and the hard sphere glass transition

The glass transition is smeared out in polydisperse hard spheres due to decoupling between small and large particles.

Graphical abstract: On polydispersity and the hard sphere glass transition
From the themed collection: Soft Matter Lectureship Winners
Open Access Paper

A multiscale approach to the adsorption of core–shell nanoparticles at fluid interfaces

Multiscale characterisation highlights the unique behaviour of soft, core–shell nanoparticles at fluid interfaces.

Graphical abstract: A multiscale approach to the adsorption of core–shell nanoparticles at fluid interfaces
From the themed collection: Soft Matter Lectureship Winners
Paper

Effect of YOYO-1 on the mechanical properties of DNA

Atomic force microscopy studies show that binding of YOYO-1 to DNA increases the contour length of DNA without affecting the persistence length due to the underwinding of DNA.

Graphical abstract: Effect of YOYO-1 on the mechanical properties of DNA
From the themed collection: Soft Matter Lectureship Winners
Paper

Role of shear-induced dynamical heterogeneity in the nonlinear rheology of colloidal gels

We report the effect of flow-induced dynamical heterogeneity on the nonlinear elastic modulus of weakly aggregated colloidal gels that have undergone yielding by an imposed step strain deformation.

Graphical abstract: Role of shear-induced dynamical heterogeneity in the nonlinear rheology of colloidal gels
From the themed collection: Soft Matter Lectureship Winners
Paper

Highly ordered 2D microgel arrays: compression versus self-assembly

A microgel monolayer at the oil–water interface is prepared using two adsorption methods and visualized by cryo-SEM and AFM methods. Hexagonal microgel arrays of different degrees of ordering are gained.

Graphical abstract: Highly ordered 2D microgel arrays: compression versus self-assembly
From the themed collection: Soft Matter Lectureship Winners
Paper

Synthesis of colloidal microgels using oxygen-controlled flow lithography

We report the synthesis of non-spherical, Brownian microparticles with sub-micron height using a modified flow lithography technique.

Graphical abstract: Synthesis of colloidal microgels using oxygen-controlled flow lithography
From the themed collection: Soft Matter Lectureship Winners
Paper

Self-organizing microfluidic crystals

We use particle shape and confinement to design a suspension that self-organizes into a flowing crystal when driven by pressure.

Graphical abstract: Self-organizing microfluidic crystals
From the themed collection: Soft Matter Lectureship Winners
Open Access Paper

Directed colloidal self-assembly in toggled magnetic fields

Suspensions of paramagnetic colloids are driven to phase separate and self-assemble by a toggled magnetic field.

Graphical abstract: Directed colloidal self-assembly in toggled magnetic fields
From the themed collection: Soft Matter Lectureship Winners
Paper

Preparation of one- to four-branch silver nanostructures of various sizes by metallization of hybrid DNA–protein assemblies

The metallization of DNA–protein nanostar templates leads to branched silver nanostructures with controllable branch sizes and degrees of branching.

Graphical abstract: Preparation of one- to four-branch silver nanostructures of various sizes by metallization of hybrid DNA–protein assemblies
From the themed collection: Directed self-assembly
Open Access Paper

Core–shell nanoparticle monolayers at planar liquid–liquid interfaces: effects of polymer architecture on the interface microstructure

High-energy X-ray reflectivity (HE-XR) sheds light on the microstructure of core–shell oxide–polymer nanoparticles adsorbed at planar liquid–liquid interfaces.

Graphical abstract: Core–shell nanoparticle monolayers at planar liquid–liquid interfaces: effects of polymer architecture on the interface microstructure
From the themed collection: Soft Matter Lectureship Winners
Paper

In situ rheology of Staphylococcus epidermidis bacterial biofilms

We develop a novel technique to grow and characterize Staphylococcus epidermidis bacterial biofilms in a continuously fed bioreactor incorporated into a parallel plate rheometer.

Graphical abstract: In situ rheology of Staphylococcus epidermidis bacterial biofilms
From the themed collection: Soft Matter Lectureship Winners
Paper

Collective dynamics of small clusters of particles flowing in a quasi-two-dimensional microchannel

In collections of flowing particles, ordered states can arise from viscous hydrodynamic interactions. Via theory and simulations, we investigate new collective hydrodynamic behaviors that require a thin channel geometry: strong confinement in one spatial direction and weak confinement in another.

Graphical abstract: Collective dynamics of small clusters of particles flowing in a quasi-two-dimensional microchannel
From the themed collection: Soft matter principles of microfluidics.
Paper

Static wetting on deformable substrates, from liquids to soft solids

Young's law breaks down for small droplets on soft substrates, depending strongly on the interplay between elasticity and surface tension.

Graphical abstract: Static wetting on deformable substrates, from liquids to soft solids
From the themed collection: Soft Matter Lectureship Winners
Paper

Out-of-equilibrium forces between colloids

Out-of-equilibrium microstructure and consequent depletion forces are measured between two probe particles held in a strongly driven colloidal suspension.

Graphical abstract: Out-of-equilibrium forces between colloids
From the themed collection: Soft Matter Lectureship Winners
Paper

A systematic study of DNA conformation in slitlike confinement

Various regimes for DNA confined in a slit.

Graphical abstract: A systematic study of DNA conformation in slitlike confinement
From the themed collection: Soft Matter Lectureship Winners
Paper

The unstable and expanding interface between reacting liquids: theoretical interpretation of negative surface tension

Reaction between two immiscible liquids can give rise to a negative surface tension and spontaneous expansion of the interface, which features complex finger-like and micellar structures.

Graphical abstract: The unstable and expanding interface between reacting liquids: theoretical interpretation of negative surface tension
From the themed collection: Soft Matter Lectureship Winners
Paper

Nonlinear microrheology of an aging, yield stress fluid using magnetic tweezers

A simple magnetic tweezer technique for probing nonlinear microrheology is described. Micro-scale yield stress measurements are demonstrated on aqueous dispersions of Laponite® clay, and comparisons are made to bulk properties.

Graphical abstract: Nonlinear microrheology of an aging, yield stress fluid using magnetic tweezers
From the themed collection: Soft Matter Lectureship Winners
Paper

Adsorption of core-shell nanoparticles at liquid–liquid interfaces

We investigate the adsorption of core-shell nanoparticles at liquid–liquid interfaces. Experiments on the time evolution of the interfacial tension are accompanied by numerical simulations to investigate the structure of the assembly and theoretical modeling aimed at shedding light on the thermodynamics of individual composite nanoparticles at liquid interfaces.

Graphical abstract: Adsorption of core-shell nanoparticles at liquid–liquid interfaces
Paper

Micromechanics of colloidal aggregates at the oil–water interface

Micromechanics of colloidal aggregates formed at oil–water interfaces are quantitatively measured using optical tweezers. Micromechanical properties link the interfacial rheology with underlying particle interactions.

Graphical abstract: Micromechanics of colloidal aggregates at the oil–water interface
Paper

Attractive interactions between colloids at the oil–water interface

Attractive and repulsive interaction forces between charged spherical latex colloids are directly measured using optical tweezers.

Graphical abstract: Attractive interactions between colloids at the oil–water interface
Paper

Enhancement of DNA compaction by negatively charged nanoparticles. Application to reversible photocontrol of DNA higher-order structure

We report that negatively charged nanoparticles enhance the ability of cationic surfactants to induce genomic DNA compaction and apply it for reversible photocontrol of DNA higher-order structure.

Graphical abstract: Enhancement of DNA compaction by negatively charged nanoparticles. Application to reversible photocontrol of DNA higher-order structure
From the themed collection: Soft Matter Lectureship Winners
Paper

Nematic order in suspensions of colloidal rods by application of a centrifugal field

This paper reports that centrifugation can be used to induce bulk nematic order in suspensions of micron-sized colloidal rods.

Graphical abstract: Nematic order in suspensions of colloidal rods by application of a centrifugal field
From the themed collection: Soft Matter Lectureship Winners
Paper

Heterogeneity of the electrostatic repulsion between colloids at the oil–water interface

The interactions between colloids at a decane-water interface is measured by optical tweezers. Monte Carlo simulations are used to understand the effect of heterogeneity on the equilibrium suspension structure.

Graphical abstract: Heterogeneity of the electrostatic repulsion between colloids at the oil–water interface
From the themed collection: Soft Matter Lectureship Winners
Paper

Chemical reaction facilitates nanoscale mixing

Chemical reaction can enhance mixing at the nanoscale.

Graphical abstract: Chemical reaction facilitates nanoscale mixing
From the themed collection: Soft Matter Lectureship Winners
50 items

About this collection

This collection highlights winners of the Soft Matter Lectureship. This annual award was established in 2009 to honour an early-stage career scientist who has made a significant contribution to the soft matter field. 

The 2017 Soft Matter Lectureship was awarded to Daeyeon Lee (University of Pennsylvania, USA). Daeyeon Lee obtained his PhD in Chemical Engineering at the Massachusetts Institute of Technology (MIT) in 2007 after completing a Bachelor’s Degree at Seoul National University in 2001. He then moved to Harvard University for a postdoctoral fellowship, before becoming a Professor of Chemical and Biomolecular Engineering at the University of Pennsylvania in 2009.

His current research interests focus on developing a deep understanding of the interactions between soft materials (e.g., polymers, colloids and biologicals, etc.) near or at interfaces. The major research efforts of his group include understanding the behaviour of Janus particles at fluid interfaces, improving the assembly and mechanical properties of nanoparticle films, generating hierarchical structures using emulsions and bubbles as templates, and developing catalytic systems for biomass conversion.

Since 2005, Prof. Lee has received 14 honours and awards and published 117 peer-reviewed articles. He received the Gold Award in Materials Research Society (MRS) in 2006, the AIChE NSEF Young Investigator Award in 2013, and the S. Reid Warren, Jr. Award in 2017, in recognition of outstanding service in stimulating and guiding the intellectual and professional development of undergraduate students.

This collection features articles published in Soft Matter from Daeyeon Lee as well as the eight previous lectureship winners: 

2016 – Damien Baigl, Ecole Normale Supérieure, Paris, France

2015 – Lucio Isa, ETH Zürich, Switzerland

2014 – Eric Dufresne, Yale Univeristy, USA

2013 – Eric Furst, University of Delaware, USA

2012 – Patrick Doyle, MIT, USA

2011 – Michael J. Solomon, University of Michigan, USA

2010 – Bartosz Grzybowski, UNIST, Republic of Korea

2009 – Emanuela Zaccarelli, University of Rome, Italy

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