Size-Dependent Phase Separation in Emulsion Droplets

ChemPhysChem ◽  
2018 ◽  
Vol 19 (16) ◽  
pp. 1995-1998 ◽  
Author(s):  
Jia Man ◽  
Steven Chien ◽  
Shuaishuai Liang ◽  
Jiang Li ◽  
Haosheng Chen
Keyword(s):  
Phase Separation ◽  
Size Dependent ◽  
Emulsion Droplets

scholarly journals Size-Dependent Phase Separation in Emulsion Droplets

ChemPhysChem ◽  
2018 ◽  
Vol 19 (16) ◽  
pp. 1937-1937
Author(s):  
Jia Man ◽  
Steven Chien ◽  
Shuaishuai Liang ◽  
Jiang Li ◽  
Haosheng Chen
Keyword(s):  
Phase Separation ◽  
Size Dependent ◽  
Emulsion Droplets

scholarly journals Front Cover: Size-Dependent Phase Separation in Emulsion Droplets (ChemPhysChem 16/2018)

ChemPhysChem ◽  
2018 ◽  
Vol 19 (16) ◽  
pp. 1933-1933
Author(s):  
Jia Man ◽  
Steven Chien ◽  
Shuaishuai Liang ◽  
Jiang Li ◽  
Haosheng Chen
Keyword(s):  
Phase Separation ◽  
Front Cover ◽  
Size Dependent ◽  
Emulsion Droplets

Synthesis and size control of Si nanocrystals by SiO/SiO2 superlattices and Er doping

2002 ◽  
Vol 737 ◽  
Author(s):  
J. Heitmann ◽  
D. Kovalev ◽  
M. Schmidt ◽  
L.X. Yi ◽  
R. Scholz ◽  
...  
Keyword(s):  
Phase Separation ◽  
Crystal Size ◽  
Radiative Lifetime ◽  
Size Control ◽  
Luminescence Signal ◽  
Er Doping ◽  
Size Dependent ◽  
Transmission Electron ◽  
Si Nanocrystals ◽  
Ultrathin Layers

ABSTRACTThe synthesis of nc-Si by reactive evaporation of SiO and subsequent thermal induced phase separation is reported. The size control of nc-Si is realized by evaporation of SiO/SiO2 superlattices. By this method an independent control of crystal size and density is possible. The phase separation of SiO into SiO2 and nc-Si in the limit of ultrathin layers is investigated. Different steps of this phase separation are characterized by photoluminescence, infrared absorption and transmission electron microscopy measurements. The strong room temperature luminescence of nc-Si shows a strong blueshift of the photoluminescence signal from 850 to 750 nm with decreasing crystal size. Several size dependent properties of this luminescence signal, like decreasing radiative lifetime and increasing no-phonon transition properties with decreasing crystal size are in good agreement with the quantum confinement model. Er doping of the nc-Si shows an enhancement of the Er luminescence at 1.54 μm by a factor of 5000 compared to doped SiO2 layers. The decreasing transfer time for the nc-Si to Er transition with decreasing crystal size can be understood as additional proof of increasing recombination probability within the nc-Si for decreasing crystal size.

scholarly journals Fabrication of Multi-Layered Microspheres Based on Phase Separation for Drug Delivery

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 723
Author(s):  
He Xia ◽  
Ang Li ◽  
Jia Man ◽  
Jianyong Li ◽  
Jianfeng Li
Keyword(s):  
Aqueous Solution ◽  
Phase Separation ◽  
Gastric Fluid ◽  
Simulated Gastric Fluid ◽  
Sustained Drug Release ◽  
Simulated Intestinal Fluid ◽  
Glycol Diacrylate ◽  
Emulsion Droplets ◽  
Collection Tube ◽  
Poly Ethylene

In this work, we used a co-flow microfluidic device with an injection and a collection tube to generate droplets with different layers due to phase separation. The phase separation system consisted of poly(ethylene glycol) diacrylate 700 (PEGDA 700), PEGDA 250, and sodium alginate aqueous solution. When the mixture droplets formed in the outer phase, PEGDA 700 in the droplets would transfer into the outer aqueous solution, while PEGDA 250 still stayed in the initial droplet, breaking the miscibility equilibrium of the mixture and triggering the phase separation. As the phase separation proceeded, new cores emerged in the droplets, gradually forming the second and third layers. Emulsion droplets with different layers were polymerized under ultraviolet (UV) irradiation at different stages of phase separation to obtain microspheres. Microspheres with different layers showed various release behaviors in simulated gastric fluid (SGF) and simulated intestinal fluid (SIF). The release rate decreased with the increase in the number of layers, which showed a potential application in sustained drug release.

scholarly journals Phase transition of RNA−protein complexes into ordered hollow condensates

2020 ◽  
Vol 117 (27) ◽  
pp. 15650-15658 ◽  
Author(s):  
Ibraheem Alshareedah ◽  
Mahdi Muhammad Moosa ◽  
Muralikrishna Raju ◽  
Davit A. Potoyan ◽  
Priya R. Banerjee
Keyword(s):  
Phase Separation ◽  
Protein Complexes ◽  
Intrinsically Disordered Protein ◽  
Liquid Droplets ◽  
Isotropic Liquid ◽  
Size Dependent ◽  
Intrinsically Disordered ◽  
Condensate Phase ◽  
Rna Complexes ◽  
Rna Protein Complexes

Liquid−liquid phase separation of multivalent intrinsically disordered protein−RNA complexes is ubiquitous in both natural and biomimetic systems. So far, isotropic liquid droplets are the most commonly observed topology of RNA−protein condensates in experiments and simulations. Here, by systematically studying the phase behavior of RNA−protein complexes across varied mixture compositions, we report a hollow vesicle-like condensate phase of nucleoprotein assemblies that is distinct from RNA−protein droplets. We show that these vesicular condensates are stable at specific mixture compositions and concentration regimes within the phase diagram and are formed through the phase separation of anisotropic protein−RNA complexes. Similar to membranes composed of amphiphilic lipids, these nucleoprotein−RNA vesicular membranes exhibit local ordering, size-dependent permeability, and selective encapsulation capacity without sacrificing their dynamic formation and dissolution in response to physicochemical stimuli. Our findings suggest that protein−RNA complexes can robustly create lipid-free vesicle-like enclosures by phase separation.

Continuous and Size-Dependent Sorting of Emulsion Droplets Using Hydrodynamics in Pinched Microchannels

Langmuir ◽  
2008 ◽  
Vol 24 (8) ◽  
pp. 4405-4410 ◽  
Author(s):  
Hirosuke Maenaka ◽  
Masumi Yamada ◽  
Masahiro Yasuda ◽  
Minoru Seki
Keyword(s):  
Size Dependent ◽  
Emulsion Droplets

scholarly journals Flow-induced phase separation of active particles is controlled by boundary conditions

2018 ◽  
Vol 115 (21) ◽  
pp. 5403-5408 ◽  
Author(s):  
Shashi Thutupalli ◽  
Delphine Geyer ◽  
Rajesh Singh ◽  
Ronojoy Adhikari ◽  
Howard A. Stone
Keyword(s):  
Phase Separation ◽  
Boundary Conditions ◽  
Numerical Simulations ◽  
Colloidal Suspensions ◽  
Many Body ◽  
Ordered Structures ◽  
Emulsion Droplets ◽  
Cell Height ◽  
Active Particles ◽  
Out Of Plane

Active particles, including swimming microorganisms, autophoretic colloids, and droplets, are known to self-organize into ordered structures at fluid–solid boundaries. The entrainment of particles in the attractive parts of their spontaneous flows has been postulated as a possible mechanism underlying this phenomenon. Here, combining experiments, theory, and numerical simulations, we demonstrate the validity of this flow-induced ordering mechanism in a suspension of active emulsion droplets. We show that the mechanism can be controlled, with a variety of resultant ordered structures, by simply altering hydrodynamic boundary conditions. Thus, for flow in Hele–Shaw cells, metastable lines or stable traveling bands can be obtained by varying the cell height. Similarly, for flow bounded by a plane, dynamic crystallites are formed. At a no-slip wall, the crystallites are characterized by a continuous out-of-plane flux of particles that circulate and re-enter at the crystallite edges, thereby stabilizing them. At an interface where the tangential stress vanishes, the crystallites are strictly 2D, with no out-of-plane flux. We rationalize these experimental results by calculating, in each case, the slow viscous flow produced by the droplets and the long-ranged, many-body active forces and torques between them. The results of numerical simulations of motion under the action of the active forces and torques are in excellent agreement with experiments. Our work elucidates the mechanism of flow-induced phase separation in active fluids, particularly active colloidal suspensions, and demonstrates its control by boundaries, suggesting routes to geometric and topological phenomena in an active matter.

Role of nucleation mechanism on the size dependent morphology of organic aerosol

2016 ◽  
Vol 52 (59) ◽  
pp. 9220-9223 ◽  
Author(s):  
Muhammad Bilal Altaf ◽  
Andreas Zuend ◽  
Miriam Arak Freedman
Keyword(s):  
Phase Separation ◽  
Ammonium Sulfate ◽  
Organic Aerosol ◽  
Nucleation And Growth ◽  
Nucleation Mechanism ◽  
Sulfate Aerosol ◽  
Size Dependent ◽  
Peg 400

The size dependent morphology of PEG-400/ammonium sulfate aerosol originates from an activated process during phase separation by nucleation and growth.

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