Synthesis of Rough Colloidal SU-8 Rods and Bananas via Nanoprecipitation.

Surface roughness plays an important role in determining the mechanical properties, wettability, and self-assembly in colloidal systems. In this work, we develop a simple and fast method to produce rough colloidal SU-8 rods, bananas, and spheres, via the nanoprecipitation of SU-8 in water. During this process, SU-8 nanospheres are absorbed onto the surface of the colloidal SU-8 particles and then cross-linked using UV-light. The size of the spherical asperities and the asperity density are controlled by the concentration of SU-8 used during the nanoprecipitation reaction. Fluorescent labeling of the rough SU-8 colloidal particles allows for their confocal imaging, which demonstrates their stability at high packing fractions. With these newly developed rough particles, we provide a colloidal model system that allows for studies addressing the impact of surface roughness on materials composed of anisotropic particles.

[1]  P. Olmsted,et al.  Particle Formation Mechanisms in the Nanoprecipitation of Polystyrene. , 2020, Langmuir : the ACS journal of surfaces and colloids.

[2]  L. Isa,et al.  Particle Surface Roughness as a Design Tool for Colloidal Systems. , 2020, Langmuir : the ACS journal of surfaces and colloids.

[3]  M. Dijkstra,et al.  Shaping colloidal bananas to reveal biaxial, splay-bend nematic, and smectic phases , 2020, Science.

[4]  S. Sacanna,et al.  Selective colloidal bonds via polymer-mediated interactions. , 2020, Soft matter.

[5]  J. Urbach,et al.  Unraveling the Role of Frictional Contacts and Particle Orientational Order During Shear-thickening in Suspensions of Colloidal Rods , 2019 .

[6]  J. Stokes,et al.  A review of nanocrystalline cellulose suspensions: Rheology, liquid crystal ordering and colloidal phase behaviour. , 2019, Advances in colloid and interface science.

[7]  R. Dullens,et al.  Synthesis of Colloidal SU‐8 Polymer Rods Using Sonication , 2019, Advanced materials.

[8]  H. Jaeger,et al.  Controlling shear jamming in dense suspensions via the particle aspect ratio. , 2019, Soft matter.

[9]  Ying Zheng,et al.  Application of flash nanoprecipitation to fabricate poorly water-soluble drug nanoparticles , 2018, Acta pharmaceutica Sinica. B.

[10]  N. Spencer,et al.  Roughness-dependent tribology effects on discontinuous shear thickening , 2018, Proceedings of the National Academy of Sciences.

[11]  T. Magrini,et al.  Fabrication of rough colloids by heteroaggregation , 2017 .

[12]  Alla Synytska,et al.  Universal emulsion stabilization from the arrested adsorption of rough particles at liquid-liquid interfaces , 2017, Nature Communications.

[13]  D. Vlassopoulos,et al.  Nonuniform flow in soft glasses of colloidal rods , 2017 .

[14]  Chongwu Zhou,et al.  A facile and low-cost length sorting of single-wall carbon nanotubes by precipitation and applications for thin-film transistors. , 2016, Nanoscale.

[15]  Lingxue Kong,et al.  Manufacturing Techniques and Surface Engineering of Polymer Based Nanoparticles for Targeted Drug Delivery to Cancer , 2016, Nanomaterials.

[16]  W. Kegel,et al.  Selective Depletion Interactions in Mixtures of Rough and Smooth Silica Spheres. , 2016, Langmuir : the ACS journal of surfaces and colloids.

[17]  A. Alsayed,et al.  Condensation and dissolution of nematic droplets in dispersions of colloidal rods with thermo–sensitive depletants , 2015, Scientific Reports.

[18]  A. San-Miguel,et al.  Influence of nanoscale particle roughness on the stability of Pickering emulsions. , 2012, Langmuir : the ACS journal of surfaces and colloids.

[19]  David A. Weitz,et al.  Surface roughness directed self-assembly of patchy particles into colloidal micelles , 2012, Proceedings of the National Academy of Sciences.

[20]  A. Higgins,et al.  Shock wave propagation in dense particle suspensions , 2010 .

[21]  Xiaoying Wang,et al.  Preparation of nanoparticles by solvent displacement for drug delivery: a shift in the "ouzo region" upon drug loading. , 2010, European journal of pharmaceutical sciences : official journal of the European Federation for Pharmaceutical Sciences.

[22]  M. Solomon,et al.  Microstructural regimes of colloidal rod suspensions, gels, and glasses , 2010 .

[23]  Ulrich S. Schubert,et al.  Synthetic polymeric nanoparticles by nanoprecipitation , 2009 .

[24]  J. Fransaer,et al.  Exploiting particle shape in solid stabilized emulsions , 2009 .

[25]  Mohan Srinivasarao,et al.  Shape separation of gold nanorods using centrifugation , 2005, Proceedings of the National Academy of Sciences.

[26]  Didier Lootens,et al.  Dilatant flow of concentrated suspensions of rough particles. , 2005, Physical review letters.

[27]  Vesselin N Paunov,et al.  Foam superstabilization by polymer microrods. , 2004, Langmuir : the ACS journal of surfaces and colloids.

[28]  H. Fessi,et al.  Physicochemical Parameters Associated with Nanoparticle Formation in the Salting-Out, Emulsification-Diffusion, and Nanoprecipitation Methods , 2004, Pharmaceutical Research.

[29]  Hatem Fessi,et al.  Nanocapsule formation by interfacial polymer deposition following solvent displacement , 1989 .

[30]  José García de la Torre,et al.  Comparison of theories for the translational and rotational diffusion coefficients of rod‐like macromolecules. Application to short DNA fragments , 1984 .

[31]  S. Broersma.  Viscous Force Constant for a Closed Cylinder , 1960 .