Effect of Defective Microstructure and Film Thickness on the Reflective Structural Color of Self-Assembled Colloidal Crystals

2020 ◽  
Vol 12 (8) ◽  
pp. 9842-9850 ◽  
Author(s):  
Tianyu Liu ◽  
Bryan VanSaders ◽  
Sharon C. Glotzer ◽  
Michael J. Solomon
Keyword(s):  
Film Thickness ◽  
Colloidal Crystals ◽  
Structural Color ◽  
Self Assembled

Effect of Particles of Irregular Size on the Microstructure and Structural Color of Self-Assembled Colloidal Crystals

Langmuir ◽  
2021 ◽  
Author(s):  
Tianyu Liu ◽  
Bryan VanSaders ◽  
Jacob T. Keating ◽  
Sharon C. Glotzer ◽  
Michael J. Solomon
Keyword(s):  
Colloidal Crystals ◽  
Structural Color ◽  
Self Assembled

Colloidal crystals self-assembled on the end face of fiber: Fabrication and characterizations

2009 ◽  
Vol 15 (3) ◽  
pp. 324-327 ◽  
Author(s):  
Haitao Yan ◽  
Ming Wang ◽  
YiXian Ge ◽  
Ping Yu
Keyword(s):  
Colloidal Crystals ◽  
Fiber Fabrication ◽  
Self Assembled

Crucial Impact of Hydrophilicity on the Self-Assembled 2D Colloidal Crystals Using Langmuir–Blodgett Method

Langmuir ◽  
2020 ◽  
Vol 36 (34) ◽  
pp. 10061-10068
Author(s):  
Heping Wu ◽  
Gang Niu ◽  
Wei Ren ◽  
Luyue Jiang ◽  
Owen Liang ◽  
...  
Keyword(s):  
Colloidal Crystals ◽  
The Self ◽  
Langmuir Blodgett ◽  
Self Assembled

Thickness-Dependent Oxidation Kinetics of Coated Films of a Self-Assembled Unsaturated Fatty Acid Aerosol Proxy with Evidence for Inert “Crust” Formation

2020 ◽  
Author(s):  
Adam Milsom ◽  
Adam M. Squires ◽  
Andrew D. Ward ◽  
Nicholas J. Terrill ◽  
Christian Pfrang
Keyword(s):  
Oleic Acid ◽  
Fatty Acid ◽  
Film Thickness ◽  
Reaction Kinetics ◽  
Unsaturated Fatty Acid ◽  
Organic Aerosols ◽  
Cloud Formation ◽  
Atmospheric Lifetime ◽  
Self Assembled ◽  
Kinetics Of

<p>This study focuses on the effect of surface film thickness on the ozone reaction kinetics of films of a self-assembled unsaturated fatty acid aerosol proxy coated inside quartz capillaries. It also reveals evidence for reaction stagnation and stopping for the thickest films, leaving a significant amount of unreacted material and suggesting that an inert product is formed during the course of the reaction. These findings have implications for the atmospheric lifetime of such a system.</p><p>The oleic acid-ozone reaction is used as the model system for heterogeneous oxidation reactions in organic aerosols. Major sources of oleic acid in the atmosphere include marine and cooking emissions. Oxidation of organic aerosols is known to affect Cloud Condensation Nuclei (CCN) generation and therefore cloud formation. It follows that factors affecting aerosol reactivity have an effect on cloud formation potential and therefore also on the climate.</p><p>In our experiments, oleic acid is mixed with its sodium salt (sodium oleate) to form a highly viscous self-assembled lamellar phase system observable using a synchrotron-based technique: Small Angle X-ray Scattering (SAXS). Here, we take advantage of intense synchrotron radiation to probe our coated capillary films. We use the observed decay of the self-assembled scattering peak as a function of time exposed to ozone. We have obtained ~50 kinetic decay parameters spanning a range of film thicknesses, showing a drastic increase in reaction kinetics with decreasing film thickness.</p><p>There is a linear relationship between increasing film thickness and amount of self-assembled material (reactant) remaining at the end of the reaction. This implies that a reaction product hinders further reactivity and that this product may take a while to form, explaining the occurrence only in thicker films.</p><p>Modelling studies will help us understand the mechanism behind these observations and to relate to a previously-postulated idea of an inert “crust” of products forming on the surface of this viscous aerosol proxy (Pfrang et al., Atmos. Chem. Phys., 2011, 11, 7343-7354).</p><p>In summary, we demonstrate thickness-dependent reaction kinetic parameters which vary significantly with film thickness, implying that the atmospheric lifetime for a film is sensitive to the film thickness. We present evidence for reaction stagnation by an as of yet unknown inert product. Kinetic modelling is ongoing in order to explain these findings.</p>

scholarly journals Relevance of packing to colloidal self-assembly

2018 ◽  
Vol 115 (7) ◽  
pp. 1439-1444 ◽  
Author(s):  
Rose K. Cersonsky ◽  
Greg van Anders ◽  
Paul M. Dodd ◽  
Sharon C. Glotzer
Keyword(s):  
Crystal Structures ◽  
Self Assembly ◽  
Colloidal Crystals ◽  
Causal Mechanism ◽  
Hard Particle ◽  
Self Assembled ◽  
Particle Shapes ◽  
The Ideal

Since the 1920s, packing arguments have been used to rationalize crystal structures in systems ranging from atomic mixtures to colloidal crystals. Packing arguments have recently been applied to complex nanoparticle structures, where they often, but not always, work. We examine when, if ever, packing is a causal mechanism in hard particle approximations of colloidal crystals. We investigate three crystal structures composed of their ideal packing shapes. We show that, contrary to expectations, the ordering mechanism cannot be packing, even when the thermodynamically self-assembled structure is the same as that of the densest packing. We also show that the best particle shapes for hard particle colloidal crystals at any finite pressure are imperfect versions of the ideal packing shape.

Self-assembled angle-independent plasmonic structural color paint

2021 ◽  
Author(s):  
Pablo Cencillo-Abad ◽  
Daniel Franklin ◽  
Pamela Mastranzo-Ortega ◽  
Debashis Chanda
Keyword(s):  
Structural Color ◽  
Self Assembled

Self-assembled PS-PMMA nanodot array pattern arranged in a parallelogram guide

2005 ◽  
Vol 901 ◽  
Author(s):  
Kaori Kimura ◽  
Masatoshi Sakurai
Keyword(s):  
Phase Separation ◽  
Block Copolymer ◽  
Film Thickness ◽  
Nanoimprint Lithography ◽  
Pmma Film ◽  
Patterned Media ◽  
Nanodot Array ◽  
Self Assembling ◽  
Array Pattern ◽  
Self Assembled

AbstractMask patterns for XY-type magnetic patterned media using phase separation of polystyrene-polymethylmethacrylate (PS-PMMA) block copolymer were fabricated. Parallelogram guides molded by the nanoimprint lithography controlled the PS-PMMA self-assembling pattern that formed in the guide area. 45nm-pitch defect-free PS-PMMA dot patterns were obtained within a 1μm × 1μm area by optimizing the PS-PMMA film thickness.

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