A self-assembled nanoparticle cluster array fabricated using nematic–isotropic phase separation on a functionalized surface

Soft Matter ◽  
2019 ◽  
Vol 15 (33) ◽  
pp. 6696-6702
Author(s):  
Jun-Seo Lee ◽  
Bomi Lee ◽  
Jang-Kun Song
Keyword(s):  
Phase Separation ◽  
Surface Functionalization ◽  
Isotropic Phase ◽  
Patterned Surface ◽  
Self Assembled ◽  
Nanoparticle Cluster ◽  
Functionalized Surface

Fabrication of a self-assembled nanoparticle cluster array using nematic–isotropic phase separation and patterned surface functionalization.

Phase equilibria in solutions of rod-like particles

1956 ◽  
Vol 234 (1196) ◽  
pp. 73-89 ◽  
Keyword(s):  
Free Energy ◽  
Phase Separation ◽  
Partition Function ◽  
Colloidal Particles ◽  
Double Layers ◽  
Positive Energy ◽  
Isotropic Phase ◽  
Electric Double Layers ◽  
Rigid Rod ◽  
Anisotropic Phase

A partition function for a system of rigid rod-like particles with partial orientation about an axis is derived through the use of a modified lattice model. In the limit of perfect orientation the partition function reduces to the ideal mixing law ; for complete disorientation it corresponds to the polymer mixing law for rigid chains. A general expression is given for the free energy of mixing as a function of the mole numbers, the axis ratio of the solute particles, and a disorientation parameter. This function passes through a minimum followed by a maximum with increase in the disorientation parameter, provided the latter exceeds a critical value which is 2e for the pure solute and which increases with dilution. Assigning this parameter the value which minimizes the free energy, the chemical potentials display discontinuities a t the concentration a t which the minimum first appears. Separation into an isotropic phase and a some what more concentrated anisotropic phase arises because of the discontinuity, in confirmation of the theories of Onsager and Isihara, which treat only the second virial coefficient. Phase separation thus arises as a consequence of particle asymmetry, unassisted by an energy term . Whereas for a large-particle asymmetry both phases in equilibrium are predicted to be fairly dilute when mixing is athermal, a comparatively small positive energy of interaction causes the concentration in the anisotropic phase to increase sharply, while the concentration in the isotropic phase becomes vanishingly small. The theory offers a statistical mechanical basis for interpreting precipitation of rod-like colloidal particles with the formation of fibrillar structures such as are prominent in the fibrous proteins. The asymmetry of tobacco mosaic virus particles (with or without inclusion of their electric double layers) is insufficient alone to explain the well-known phase separation which occurs from their dilute solutions at very low ionic strengths. Higher-order interaction between electric double layers appears to be a major factor in bringing about dilute phase separation for these and other asymmetric colloidal particles bearing large charges, as was pointed out previously by Oster.

Preparation of PDMS ultrathin films and patterned surface modification with cellulose

RSC Advances ◽  
2014 ◽  
Vol 4 (23) ◽  
pp. 11955-11961 ◽  
Author(s):  
Matej Bračič ◽  
Tamilselvan Mohan ◽  
Rupert Kargl ◽  
Thomas Griesser ◽  
Silvo Hribernik ◽  
...  
Keyword(s):  
Surface Modification ◽  
Surface Functionalization ◽  
Ultrathin Films ◽  
Patterned Surface

Patterned surface functionalization of PDMS with the biopolymer cellulose via lithographic methods.

scholarly journals Electrochemical Detection of Nanoscale Phase Separation in Binary Self-Assembled Monolayers

Langmuir ◽  
2005 ◽  
Vol 21 (10) ◽  
pp. 4615-4621 ◽  
Author(s):  
R. Carlisle Chambers ◽  
Christina E. Inman ◽  
James E. Hutchison
Keyword(s):  
Phase Separation ◽  
Electrochemical Detection ◽  
Self Assembled Monolayers ◽  
Nanoscale Phase Separation ◽  
Assembled Monolayers ◽  
Self Assembled

Effect of Nanometer-Scale Phase Separation on Wetting of Binary Self-Assembled Thiol Monolayers on Au(111)

Langmuir ◽  
1998 ◽  
Vol 14 (9) ◽  
pp. 2348-2351 ◽  
Author(s):  
Shin-ichiro Imabayashi ◽  
Narutoshi Gon ◽  
Takayuki Sasaki ◽  
Daisuke Hobara ◽  
Takashi Kakiuchi
Keyword(s):  
Phase Separation ◽  
Nanometer Scale ◽  
Thiol Monolayers ◽  
Self Assembled
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