Microfluidic synthesis of Janus particles by UV-directed phase separation

Lone, Saifullah; Kim, Sung Hoon; Nam, Seong Won; Park, Sungsu; Joo, Jin; Cheong, In Woo

doi:10.1039/c0cc04517a

Cited by 78 publications

(63 citation statements)

References 38 publications

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“…The materials used are generally immiscible and or viscous so as to preserve a sharp interface. The latter technique, which was used in the work of Gangwal et al [] involves coating one hemisphere of a previously homogeneous particle [].…”

Section: Introductionmentioning

confidence: 99%

Induced‐charge electrophoresis of uncharged dielectric spherical Janus particles

Boymelgreen

Miloh²

2012

Electrophoresis

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We derive the equations governing the dipolophoretic motion of an electrically inhomogeneous Janus particle composed of two hemispheres with differing permittivities. The general formulation is valid for any electric forcing, including alternating current (AC) and makes no assumptions regarding the size of the electric double layer (EDL). The solution is thus valid even for nanoparticles where the particle radius can be of the same order as the EDL thickness. Semi-analytic and numerical solutions for the linear phoretic velocity and angular rotation of a single Janus particle suspended in an infinite medium are given in the limit of uniform direct current (DC) electric forcing. It is determined that particle mobility is a function of the permittivity in each hemisphere and the contrast between them as well as the EDL length. For a particle in which both hemispheres are characterized by a finite permittivity, we discover that maximum mobility and rotation is not obtained in the Helmholtz-Smoluchowski thin EDL limit but is rather a function of the permittivity and EDL properties.

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Section: Introductionmentioning

confidence: 99%

Induced‐charge electrophoresis of uncharged dielectric spherical Janus particles

Boymelgreen

Miloh²

2012

Electrophoresis

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“…Ideally, patterned surfaces and tailored functionality could act in concert with the shape anisotropy of the building blocks to focus interactions between particles, and could assist, direct or enhance their selforganization 11 . To match the richness and complexity of the self-assembled structures revealed by recent computer-simulation studies, a great deal of work has been devoted to advance synthetic strategies for the fabrication of patchy and anisotropic colloids [12][13][14][15][16][17][18] . Rarely, however, do fabrication techniques integrate design freedom with high particle throughput.…”

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confidence: 99%

Shaping colloids for self-assembly

et al. 2013

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The creation of a new material often starts from the design of its constituent building blocks at a smaller scale. From macromolecules to colloidal architectures, to granular systems, the interactions between basic units of matter can dictate the macroscopic behaviour of the resulting engineered material and even regulate its genesis. Information can be imparted to the building units by altering their physical and chemical properties. In particular, the shape of building blocks has a fundamental role at the colloidal scale, as it can govern the self-organization of particles into hierarchical structures and ultimately into the desired material. Herein we report a simple and general approach to generate an entire zoo of new anisotropic colloids. Our method is based on a controlled deformation of multiphase colloidal particles that can be selectively liquified, polymerized, dissolved and functionalized in bulk. We further demonstrate control over the particle functionalization and coating by realizing patchy and Janus colloids.

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“…Droplets are formed in the stream for polymerization. 24 Microfluid is perhaps the only method that can be easily scaled up for mass production. 11 However, the sizes produced from microfluid approach are a lot bigger than those prepared by phase separation and masking.…”

Section: Polymeric Janus Particlesmentioning

confidence: 99%

Janus Nanostructures and Their Bio-medical Applications

Wang¹,

Wang²

2014

Bio-Inspired Nanomaterials and Applications

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Nanotechnology has great potential in bio-medicine, leading to tremendous efforts in gene transfection, drug delivery, cell targeting and hyperthermia. As researchers gain familiarity with homogeneous nanomaterials, more attention is drawn to Janus nanostructure, an emerging new material with two or more distinct properties. With the uniqueness in asymmetry, Janus nanomaterials offer more possibilities for assembling multifunctional carriers. In this chapter, the synthesis of ternary Janus system of silica, Fe 3 O 4 and polystyrene is introduced. A relatively easy method of combining miniemulsion and sol-gel is employed. The reaction mechanism is discussed with controllable morphology obtained. Dual surface functionalities are explored by selectively conjugating targeting group and anti-cancer drug. In vitro drug release profi les indicate a pH-responsive fashion. Cell study proves that the Janus nanocomposites successfully combine targeting and controlled drug release, achieving higher drug effi cacy. Future endeavors will focus on structure novelty as well as fabrication simplifi cation and scaling up. With its potential for higher integration, Janus nanostructures can well-serve as a versatile platform for biomedical applications.Bio-Inspired Nanomaterials and Applications Downloaded from www.worldscientific.com by KAINAN UNIVERSITY on 02/03/15. For personal use only.

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Microfluidic synthesis of Janus particles by UV-directed phase separation

Abstract: A synthetic methodology based on microfluidics has been developed to fabricate monodisperse polymer Janus particles by UV-directed phase separation.

Cited by 78 publications

References 38 publications

Induced‐charge electrophoresis of uncharged dielectric spherical Janus particles

Induced‐charge electrophoresis of uncharged dielectric spherical Janus particles

Shaping colloids for self-assembly

Janus Nanostructures and Their Bio-medical Applications

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