Micropatterning from drying micelle solution of diblock copolymers: strap-structure, quadrate farmland-structure and biomimetic structure

Chan, Yannie; Lü, Xiaolin; Chen, Er Qiang; Mi, Yongli

doi:10.1016/j.polymer.2003.09.068

Cited by 7 publications

(7 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our hypothesis was that the properties of the patterned films could be adjusted by changes in the block copolymer composition, structure, and topology39 and also in the nature of the solvent because the primary component of the micropattern is a block copolymer micellar assembly 38, 40–42. This hypothesis was based on the work of Mi et al35–37 and other similar key findings from evaporative experiments43, 44 and particle assembly45 within confined geometries. Controlled droplet evaporation from toluene solutions of poly‐(ferrocenyldimethylsilane) on silicon43 and poly[2‐methoxy‐5‐(2‐ethylhexyloxy)‐1,4‐phenylenevinylene] on mica,44 each within confined geometries of aspherical lens on a flat substrate and crossed cylinders, respectively, have been found to produce periodic concentric ring patterns with high degrees of uniformity.…”

Section: Introductionmentioning

confidence: 92%

“…In 2004, Mi and coworkers published a series of articles35–37 outlining the use of solvent evaporation to form micropatterned films from concentrated solutions of diblock copolymer micelles, expanding on observations reported by Zhang and Eisenberg 38. The mechanism by which these interesting micropatterned surfaces formed was hypothesized to involve the aggregation of the micelles to create a gel‐like foot at the edge of the film and a solid crust on the surface of the evaporating solution next to the gel region.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of the structure of nanoscopic building blocks on the assembly of micropatterned surfaces

Germack¹,

Harrisson²,

Brown³

et al. 2006

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

The effect of solution-state nanoscale structures on the assembly of micropatterns by solvent evaporation was explored with a novel amphiphilic diblock copolymer synthesized by reversible addition-fragmentation chain transfer polymerization. A copolymer of the structure poly(styrene-alt-maleic anhydride) 75 -b-isoprene 84 was assembled into inverse micelles in toluene, and covalently stabilized in the core by reactive amidation of maleic anhydride residues with 2,2 0 -(ethylenedioxy)bis(ethylamine) to create core-crosslinked nanoparticles (CCNPs) or in the shell by the photoinitiated radical crosslinking reactions of isoprene units to create large crosslinked aggregates (LCAs) of heterogeneous sizes and shapes. Micropatterned films were prepared by the deposition of the diblock copolymer as a solution in acetone and the nanoscale structures (inverse micelle, crosslinked aggregate, and CCNP) as solutions in toluene onto trimethylysilyl chloride treated glass microscope slides under ambient conditions. An analysis by optical microscopy and tapping-mode atomic force microscopy (AFM) indicated that the nanoscale surface topology could be controlled by the pre-establishment of the block copolymer phase segregation into well-defined core-shell nanoassemblies in solution. The most interesting films resulted from the evaporative deposition of inverse micelle and CCNP solutions, which afforded uniform, straplike micropatterns of similar dimensions on the microscale and low surface roughness on the nanoscale (roughness ¼ 4 6 1 and 6 6 1 nm by AFM). V V C 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: [5218][5219][5220][5221][5222][5223][5224][5225][5226][5227][5228] 2006

show abstract

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Influence of the structure of nanoscopic building blocks on the assembly of micropatterned surfaces

Germack¹,

Harrisson²,

Brown³

et al. 2006

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

show abstract

“…Further drying will lead to crack formation in the drop; for example, regular cracks and interesting spokelike patterns of cracks have been observed. [17][18][19]27 In our study, we examined the pattern formation in the drying of relatively concentrated solution drops containing spherical micelles on solid substrates. The hierarchical patterns and structures with length scales ranging from micrometer down to nanometer were observed after drying the drop.…”

Section: Introductionmentioning

confidence: 99%

Crust Effect on Multiscale Pattern Formations in Drying Micelle Solution Drops on Solid Substrates

Xia

Chen

et al. 2004

Langmuir

Self Cite

View full text Add to dashboard Cite

Spherical micelles of a polystyrene-b-poly(dimethylsiloxane) (PS-b-PDMS) diblock copolymer with the number-average molecular weight of 193 000 g/mol for PS and 39 000 g/mol for PDMS were obtained by using n-dodecane or n-octane as the selective solvent for the PDMS block. The drying process of micelle solution drops with relatively high polymer concentration on solid substrates and the resultant drying patterns were studied using optical microscopy and atomic force microscopy. The drying drops exhibited an inner solution "cap" connecting with an outer gelled "foot" through a transition zone. A crust was first formed on the surface of the transition zone and remained on the top of the foot region. An inhomogeneous stress perpendicular to the radial direction within the crust, which was due to the solvent evaporation accompanied by the receding of the solution cap, induced regular 45 degrees -tilted stripes (pleats) in the transition zone and main radial cracks in the foot region. The stripes and cracks have periods of a few and tens of microns, respectively. Concave micelle "bricks" were also observed between cracks. In addition to micelle close packing, these patterns demonstrate that drying micelle solution drops may provide a potential means to manipulate fine and multiscale structures for technological applications.

show abstract

“…Such crack arrays are observed in thin layers of paints, glazing and other coatings (Hu and Evans, 1989;Choules et al, 2001;Parbrook et al, 2003;Chan et al, 2004) which have undergone drying, curing or temperature change. They also exist on a larger scale in road paving (Timm et al, 2003;Hong et al, 1997) concrete (Bažant et al, 2003), drying of mud (Weinberger, 1999;Plummer and Gostin, 1981), soil (Chertkov, 2002), food (Akiyama et al, 1997) and timber (Kang and Lee, 2002) or the formation of basalt columns (Jagla and Rojo, 2002;Saliba and Jagla, 2003)and other geological features observed on Earth as well as other planets (Dance et al, 2001;Sletten et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Determination of crack spacing and penetration due to shrinkage of a solidifying layer

Jenkins

2009

International Journal of Solids and Structures

View full text Add to dashboard Cite

a b s t r a c tA method based on energy minimisation is used to determine the spacing and penetration of a regular array of cracks in a layer of material whose thickness is increasing as it solidifies from a liquid. After solidification, the slab shrinks and subsequently cracks due to internal stresses. A simple Stefan solidification model is used to determine the thickness of the slab as time progresses as well as the temperature profile in the slab. The key feature of the results is that a minimum crack spacing occurs early in the solidification process and this minimum defines a basic spacing for the crack array. The minimum spacing occurs for a range of constraints (boundary conditions) and thermal profiles in the material, indicating the robustness of the phenomenon. Cracks propagating with the unique minimum spacing are subject to a period doubling instability that acts to coarsen the crack pattern, which brings the crack spacing close to the minimum energy state for later time. Good numerical comparison between the crack spacings predicted by energy minimisation and those observed in basalt columns is demonstrated.Crown

show abstract

Micropatterning from drying micelle solution of diblock copolymers: strap-structure, quadrate farmland-structure and biomimetic structure

Cited by 7 publications

References 27 publications

Influence of the structure of nanoscopic building blocks on the assembly of micropatterned surfaces

Influence of the structure of nanoscopic building blocks on the assembly of micropatterned surfaces

Crust Effect on Multiscale Pattern Formations in Drying Micelle Solution Drops on Solid Substrates

Determination of crack spacing and penetration due to shrinkage of a solidifying layer

Contact Info

Product

Resources

About