The selfassembly of patchy particles decorated with two patches of different. Selfassembly of patchy particles the glotzer group university of. A facile method to synthesize shapeshifting patchy particles on the colloidal scale is described. Kegel, vant hoff laboratory for physical and colloid chemistry and soft condensed matter, debye institute for nanomaterials science, utrecht university, utrecht, the. Synthesis and selfassembly of janus and triblock patchy. Our aim is to investigate the assembly of jps at high volume fractions and experimentally modulate the interparticle potential by varying the thickness of the. The test system is a small drop of water with detergent and particles on a plate of glass. Glotzer, departments of chemical engineering and materials science and engineering, university of michigan, ann arbor, michigan 4810926. We use monte carlo simulations and freeenergy techniques to show that binary solutions of penta and hexavalent twodimensional patchy particles can form thermodynamically stable quasicrystals even at very narrow patch widths, provided their patch interactions are chosen in an appropriate way. Reversible selfassembly of patchy particles into monodisperse icosahedral clusters alex w. Selfassembly of patchy particles nano letters acs publications. As a vehicle for encoding hierarchical selfassembly, triblock patchy particles appear especially appealing 36, 92.
Previously, we extended the canonical model by introducing an isotropic, attractive interaction. Selfassembly of bifunctional patchy particles with. An experiment with patchy colloidal particles was done based on independent surface roughness specific interactions. We explore the use of templated selfassembly to facilitate the formation of complex target structures made from patchy particles. Shape has a fundamental role in selfassembly as it can regulate particle recognition 3, determine the density and the structure of particle packings 4,5,6,7,8, and facilitate binding from ligand. The self assembly of these socalled \janus particles has been investigated in computer simulations,14 and re. Additionally, from the standpoint of predicting patchy particle selfassembly, the. His research interests focus on dna selfassembly to control static. Here we show that, by a novel combination of two theoretical tools, it is indeed possible to predict the selfassembly scenario of patchy colloidal particles.
Calculation of partition functions for the selfassembly. To model the patchy particles, we use the potential that we have used in our previous work on selfassembly,46,47 but with the additional feature that we consider multiple particle types. Selfassembly of colloids with liquid protrusions daniela j. Selfassembly of twodimensional binary quasicrystals. Layerbylayer assembly of patchy particles as a route to. Fabrication, assembly, and application of patchy particles. The term selfassembly refers to the spontaneous formation of an ordered structure or pattern from its initially disordered components without any human intervention whitesides and grzybowski, 2002. Valence, loop formation and universality in selfassembling patchy. Patchy particles are micron or nanoscale colloidal particles that are anisotropically patterned.
Spherical in shape with a liquid core, patchy particles are 10 100 times smaller than a human cell. We employ monte carlo simulations to investigate the self assembly of patchy colloidal dumbbells interacting via a modified kernfrenkel potential by probing the system concentration and dumbbell. The selfassembly of these socalled \janus particles has been investigated in computer simulations,14 and re. Patchy particles made by colloidal fusion nyu scholars. Selfassembly of patchy particles into polymer chains. The particles have a repulsive core and highly interactive surfaces that allow for this assembly. Pdf selfassembly scenarios of patchy colloidal particles. The design is based on the solventinduced shifting of the patch shape between concave and convex features. Kegela avan t hoff laboratory for physical and colloid chemistry, debye institute for nanomaterials science, utrecht university.
Patchy particles are micron or nanoscale colloidal particles that are anisotropically patterned, either by modification of the particle surface chemistry enthalpic patches, through particle shape entropic patches, or both. Selfassembly of bifunctional patchy particles with anisotropic shape into polymers chains. Selfassembly of patchy particles zhenli zhang and sharon c. Effects of specific interactions on liquid structure, author vasilyev, oleg a. Motivated by observations of heterogeneous domain structure on the surface of cells, we consider a minimal model to describe the dynamics of phase separation on the surface of a spherical particle. Colloidal selfassembly has the potential to revolutionize 3d.
One of the simplest patchy particle models is a sphere where one half is covered with an attractive patch that can interact with a similar patch on another sphere. We find that nucleation around the core particle can inhibit aggregate forma. Calculation of partition functions for the selfassembly of. Our approach to achieve patchy particles employs depletion interactions between particles that have locally different surface roughness, as for example shown in fig. Kraft, a, 1 ran ni, b frank smallenburg, b michiel hermes, b kisun yoon, c david a. Surface roughness directed self assembly of patchy particles into colloidal micelles daniela j. Rotational diffusion affects the dynamical selfassembly. The particles is made of polystyrene, and has a radius of 2. These new colloidal particles exhibit a sitespecific engineering of their surface and are commonly named patchy particles. These are molecules which have different attraction and repulsion.
To facilitate selfassembly, it is possible to decorate various sites on the surface of such particles with different charges, called patches. Selfassembly scenarios of patchy colloidal particles gunther doppelbauer. Saccana also believes that colloidal selfassembly has the potential to revolutionize. The canonical model of patchy particles, a hard sphere decorated with attractive patches, has been used to describe solutions of small globular proteins, as well as micronsize particles with attractive patches. The video is recorded with standard optic measurements. The design is based on the solventinduced shifting of the patch shape between concave and convex. Thus, in this work, we provide a mechanistic study of the self assembly process of plga and lpfgs that renders particles with a patchy surface and hollow or solid core. Colloidal particles with sitespecific directional interactions, so called patchy particles, are promising candidates for bottomup assembly routes. Selfassembly scenarios of patchy colloidal particles. This method allows formation of complex structures like chains, sheets, rings, icosahedra, square pyramids, tetrahedra, and twisted staircase structures. The assembly of patchy particles has made it possible to reconstitute molecules and.
Mechanistic studies on the selfassembly of plga patchy. Sep 02, 2015 this video shows self assembly of colloid particles in water with detergent. Chains, sheets, rings, icosahedra, square pyramids, tetrahedra, and twisted and staircase structures are. Jul 03, 2012 surface roughness directed self assembly of patchy particles into colloidal micelles daniela j. Weitzc, alfons van blaaderenb, jan groenewolda, marjolein dijkstrab, and willem k. Theoretical and simulation studies on the selfassembly of patchy colloidal particles 37, 38 have shown that a variety of topologies, including fractallike topologies 394041, can result.
Patches on the surfaces of colloidal particles 1,2,3,4,5 provide directional information that enables the selfassembly of the particles into higherorder structures. Molecular simulations are performed to study the selfassembly of. An area of intense research in the last two decades has been the study of the selfassembly of patchy colloids 22 2324. Predictive supracolloidal helices from patchy particles scientific. Molecular simulations are performed to study the selfassembly of particles with discrete, attractive interaction sites patches at prescribed locations on the particle surface. Surface roughness directed selfassembly of patchy particles into.
Surface roughness directed selfassembly of patchy particles into colloidal micelles daniela j. Initially, we present the model of patchy particles studied here and there is the behavior of the interaction energy between two particles and its dependence on load effective particle liquid charge and the number of active sites p that decorate the surfaces of colloids, called patches. The model has also been used to study the crystallization of patchy colloids,5356 and, with an additional torsional. Natural systems form complex multiscale structures through selfassembly.
Spontaneous assembly of a hybrid crystalliquid phase in. Doyea physical and theoretical chemistry laboratory, university of oxford, south parks road, oxford ox1 3qz. Simulations document selfassembly of proteins and dna. Glotzer, department of chemical engineering, university of michigan, ann arbor, michigan 48109, united states department of materials science and engineering, university of michigan, ann arbor, michigan 48109, united states. Abstract the authors numerically study a simple fluid composed of particles having a hardcore repulsion, complemented by two shortranged attractive sticky spots at the particle poles, which provides a simple model for equilibrium polymerization of linear chains. Selfassembly scenarios of patchy colloidal particles in. Janus particles jps are colloids with anisotropic interactions that can potentially form complex lamellae and tubular phases. Several computational studies on the selfassembly of patchy particles have been reported and these have pushed the imagination of the patchy particle community to new heights. Selfassembly scenarios of patchy colloidal particles in two dimensions. The placement of these patches on the surface of a particle. Synthesis of the constituent building blocks of the lccs. This article reports a method for preparing micro and nanoparticles by shearing liquids into complex. Shaping colloids for selfassembly nature communications.
Pdf anisotropy in selfassembly of patchy particles. Predicting the self assembly kinetics of particles with anisotropic interactions, such as colloidal patchy particles or proteins with multiple binding sites, is important for the design of novel hightech materials, as well as for understanding biological systems, e. Selfassembly is also a method to create patchy particles. Patchy colloidal particles for programmed selfassembly. Yet self assembly has the advantage that a large variety of shapes and functions on many length scales can be obtained. Patchy colloidal particles for programmed selfassembly emconsulte. Krafta,1, ran nib, frank smallenburgb, michiel hermesb, kisun yoonc, david a. Jul 03, 2012 colloidal particles with sitespecific directional interactions, so called patchy particles, are promising candidates for bottomup assembly routes towards complex structures with rationally designed properties. Glotzer, departments of chemical engineering and materials science and engineering, university of.
Patchy particles of valency three or more experience liquidliquid phase separation. Double direct templating of periodically nanostructured zns hollow microspheres. In particular, the hierarchical selfassembly into cubic diamond and bodycentered cubic crystals was demonstrated via distinct clusters, namely, tetrahedra and octahedra, respectively. Colloidal particles with sitespecific directional interactions, so called patchy particles, are promising candidates for bottomup assembly routes towards complex structures with rationally designed properties. Thus, in this work, we provide a mechanistic study of the selfassembly process of plga and lpfgs that renders particles with a patchy surface and hollow or. These particles carry two extended charged caps that repel each other and attract the oppositely charged equatorial region of the colloids. Pdf patchy colloidal particles for programmed selfassembly. As a vehicle for encoding hierarchical self assembly, triblock patchy particles appear especially appealing 36, 92. Templated selfassembly of patchy particles soft matter. Our new patchy model system opens up the possibility for selfassembly studies into finitesized superstructures as well as crystals with as of yet inaccessible structures. I discuss how the geometry and the interparticle interaction affect the selfassembly of two patchy particles models, namely, patchy dumbbells and mickey mouse particles. Noya,b emanuela bianchi,a and gerhard kahla the rapid progress in precisely designing the surface decoration of patchy colloidal particles offers a new, yet unexperienced freedom to create building entities for larger, more complex structures in soft.
Self assembly of patchy particles into diamond structures through molecular mimicry. In a very recent study that used a variety of computational techniques, morphew et al. Weitz, c alfons van blaaderen, b jan groenewold, a marjolein dijkstra, b and willem k. Relatively less work has been done on selfassembly of patchy particles, but reports of unusual and interesting structures are starting to emerge. Self assembly is a process which is easily influenced by external parameters. Multivalent patchy colloids for quantitative 3d self. Finitesize effects on the curved particle surface lead to the formation of longlived, metastable states for which the density is distributed in patches over the particle surface. Structures can be tuned, of course, by changing the size and con. With a wider parameter space to explore, computer simulation studies are expected to play a critical role to guide programmable self assembly of multipatch particles. Sep 18, 2017 patches on the surfaces of colloidal particles 1,2,3,4,5 provide directional information that enables the self assembly of the particles into higherorder structures. Multivalent patchy colloids for quantitative 3d selfassembly. Shape has a fundamental role in self assembly as it can regulate particle recognition 3, determine the density and the structure of particle packings 4,5,6,7,8, and facilitate binding from ligand. Colloidal particles with sitespecific directional interactions, so called patchy particles, are promising candidates for bottomup assembly routes towards.
The selfassembly of these socalled janus particles has been. Chains, sheets, rings, icosahedra, square pyramids, tetrahedra, and twisted and staircase structures are obtained through suitable design of the surface pattern of patches. This feature can make synthesis rather complex because of the need to control many free parameters. Molecular simulations are performed to study the selfassembly of particles with discrete, attractive interaction sites. Recent progress on patchy colloids and their selfassembly. Synthesis and selfassembly of janus and patchy colloidal. In this dissertation, i investigated the synthesis and selfassembly of janus and patchy colloidal particles with emphasis on janus amphiphilic particles, which are. In this dissertation, i investigated the synthesis and self assembly of janus and patchy colloidal particles with emphasis on janus amphiphilic particles, which are the colloidal counterpart of surfactant molecules. This video shows self assembly of colloid particles in water with detergent. Since liquidliquid phase separation occurs at low temperatures, we also. Depletion attraction arises in dispersions of colloidal particles when a second, smaller type of nonadsorbing colloid or macromolecule, also termed depletant, is introduced in the suspension 18 20.
Synthesis of liquid coreashell particles and solid patchy. The initial concave patchy particles were synthesized in a water suspension by a swellinginduced buckling process. With a wider parameter space to explore, computer simulation studies are expected to play a critical role to guide programmable selfassembly of multipatch particles. Stefano sacanna, at new york university, imagines that solutions of patchy particles where the patches act as attachment sites for bonds between the particles could potentially be fluids from which materials can emerge by selfassembly spontaneously, much like how the villain rises out of liquid metal in the movie the. In particular, selfassembly provides a promising bottomup route to threedimensional 3d structures. Molecular simulations are performed to study the selfassembly of particles with discrete.