Self-assembly Behavior of Amphiphilic Janus Particles in the Acting Process of Breath Figure Method†

doi:10.7503/cjcu20160711

Abstract

Abstract:

Breath figure(BF) method is a dynamic templating method for surface patterning of polymeric materials. The BF process has been extensively studied as a novel methodology to achieve surface patterning via self-assembly. During the evaporation of the solvent, functional buliding blocks added into the casting solution such as nanoparticles, block copolymers and other components containing hydrophilic parts could be able to spontaneously migrate onto the water/oil interfaces formed between templating water droplets and casting solution during the BF process. As a result, functionalization and modification of the obtained patterned surfaces on selective areas could be achieved at the time when matrices of patterned surfaces are formed. By employing the particles in BF method, the porous film with pore arrays selectively decorated with particles can be fabricated. Based on the combination of interfacial self-assembly of particles and self-assembly process of BF, amphiphilic Janus particles were employed in the breath figures method. Amphiphilic Janus silica particles were prepared by selective chemical treatment on the particle “colloidosomes”. Janus particles enriching the patterned pores present unique assembling characteristics which are much different from previously reported cases with homogeneous particles. The experimental results indicate that Janus particles show optimized assembling morphology when they are involved in the interfacial self-assembly process of BF. By employing Janus particles, a trade-off of the ordering of the honeycomb-structured pore arrays and the density of decorated particles was also achieved. With lower concentration of particles being used, Janus particles show quite different assembling behavior from their homogeneous counterparts. It opens an attractive route to produce functional hierarchically patterned materials by, for example, loading the biological Janus particles for single-cell cultures or catalytic Janus particles for micro-chemical reactors.

Key words: Janus particle, Breath figure method, Self-assembly, Functional honeycomb-structured porous film

CLC Number:

O631.1

TrendMD:

YANG Pinghui, ZHU Jiafeng, SUN Wei, ZHOU Wanrong. Self-assembly Behavior of Amphiphilic Janus Particles in the Acting Process of Breath Figure Method^†[J]. Chem. J. Chinese Universities, 2017, 38(4): 678.

Figures/Tables 6

Fig.1 SEM images of colloidosomes made from silica particles[600 nm(A, B) and 1000 nm(C, D )] stabilized wax-in-water emulsion

Fig.2 SEM images of Janus particles selective area labeled with Au nanoparticles (A) 600 nm; (B) 1000 nm.

Fig.3 SEM images of porous films fabricated from solutions prepared by adding Janus particles(A—D) and hydrophilic particles suspension(E—H) with concentration of 10 mg/mL into 1 mL PS chloroform solution with concentration of 15 g/LThe amounts of Janus particles(or hydrophilic SiO2 particles) suspension are 10 μL(A, E), 15 μL(B, F), 20 μL(C, G), 25 μL(D, H), respectively.

Fig.4 SEM images of porous films fabricated from solutions prepared by adding Janus particles(A, B) and hydrophilic particles alcoholic suspension(C, D) with the concentration of 10 mg/mL into 1 mL PS chloroform solution with concentration of 15 mg/mLThe amount of particles alcoholic suspension was 45 μL.

Fig.5 Cross-sectional SEM images of porous films fabricated from solutions prepared by adding Janus particles with the concentration of 10 mg/mL into 1 mL PS chloroform solution with concentration of 15 mg/mLThe amount of particles suspension is 60 μL.

Fig.6 Cross-sectional SEM images of porous films fabricated from solutions prepared by pure PS chloroform(A) or adding Janus particles(B—D ) with the concentration of 10 mg/mL into 1 mL PS chloroform solution with concentration of 15 mg/mLThe amount of particles alcoholic suspension is 15 μL(B ), 30 μL(C ) and 45 μL(D).

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