Search

Your search keyword '"Hailin Cong"' showing total 4 results
Start Over Author "Hailin Cong" Topic colloids
4 results on '"Hailin Cong"'

1. Thin Film Interference of Colloidal Thin Films

Author

Weixiao Cao and Hailin Cong

Subjects
Materials science, genetic structures, Silicon, Surface Properties, chemistry.chemical_element, Substrate (electronics), Sensitivity and Specificity, complex mixtures, Colloid, Optics, Electrochemistry, Perpendicular, Polymethyl Methacrylate, General Materials Science, Colloids, Irradiation, Particle Size, Thin film, Spectroscopy, business.industry, Membranes, Artificial, Surfaces and Interfaces, Colloidal crystal, Condensed Matter Physics, Acrylates, chemistry, Thin-film interference, Microscopy, Electron, Scanning, Polystyrenes, Optoelectronics, business
Abstract

A stairlike colloidal crystal thin film composed of poly(styrene-methyl methacrylate-acrylic acid) (P(St-MMA-AA)) monodispersed colloids was fabricated on an inclined silicon substrate. Different bright colors were observed on the various parts of the film with different layers as white light irradiated perpendicularly on it. The relationship between the colors and layers of the film was investigated and discussed according to the principle of thin film interference. On the basis of the phenomenon of thin film interference, a one-layer colloidal film having uniform color was researched and it would display diverse colors before and after swollen by styrene (St). A circular stairlike colloidal film was achieved to mimic the colors of the peacock tail feather.

Published
2004

2. Preparation of iridescent colloidal crystal coatings with variable structural colors

Author

Bing Yu, Jilei Wang, Shao-Peng Wang, Limin Qi, Yurong Ma, and Hailin Cong

Subjects
endocrine system, Materials science, Light, Dispersity, Color, complex mixtures, Crystal, chemistry.chemical_compound, Colloid, Optics, Scattering, Radiation, Colloids, Photonic crystal, Nanotubes, Carbon, business.industry, digestive, oral, and skin physiology, technology, industry, and agriculture, Equipment Design, Colloidal crystal, Atomic and Molecular Physics, and Optics, Equipment Failure Analysis, body regions, Refractometry, Light intensity, chemistry, Computer-Aided Design, Polystyrene, Crystallization, business, Structural coloration
Abstract

Iridescent colloidal crystal coatings with variable structural colors were fabricated by incorporating carbon black nanoparticles (CB-NPs) into the voids of polystyrene (PS) colloidal crystals. The structural color of the colloid crystal coatings was not only greatly enhanced after the composition but also varied with observation angles. By changing the diameter of monodisperse PS colloids in the composites, colloidal crystal coatings with three primary colors for additive or subtractive combination were obtained. After incorporation of the PS/CB-NPs hybrid coatings into polydimethylsiloxane (PDMS) matrix, manmade opal jewelry with variable iridescent colors was made facilely.

Published
2013

3. Aminosilane Cross-linked PEG/PEPEG/PPEPG Membranes for CO2/N2and CO2/H2Separation.

Author

Hailin Cong and Bing Yu

Subjects
*SILANE compounds, *CROSSLINKED polymers, *POLYETHYLENE glycol, *ARTIFICIAL membranes, *SEPARATION of gases, *NANOCOMPOSITE materials, *COLLOIDS
Abstract

Aminosilane-modified poly(ethylene glycol) (PEG), PEG-block-poly(propylene glycol) (PPG)-block-PEG (PEPEG), and PPG-block-PEG-block-PPG (PPEPG) diacrylate prepolymers are synthesized as new membrane materials for gas separation. By combining the in situ sol−gel process and cross-linking process together, the silane-modified prepolymers form flexible nanocomposite membranes with a maximum CO2permeability of 274 barrer and CO2/N2selectivity of about 30. The CO2permeabilities of silane cross-linked PEPEG and PPEPG membranes are higher than those of silane cross-linked PEG membranes, whereas the CO2/N2and CO2/H2selectivities increase as the PEG content increases in the membrane. A proper aminosilane/prepolymer reaction ratio benefits the gas separation performance of the membrane due to the formation of different cross-linking structures and composites. [ABSTRACT FROM AUTHOR]

Published
2010
Full Text
View/download PDF

4. Non-adhesive PEG hydrogel nanostructures for self-assembly of highly ordered colloids.

Author

Hailin Cong, Alexander Revzin, and Tingrui Pan

Subjects
*POLYETHYLENE glycol, *COLLOIDS, *NANOSTRUCTURED materials, *SUBSTRATES (Materials science), *SURFACE analysis, *SURFACE coatings, *MOLECULAR self-assembly
Abstract

In this paper, we report on the effect of patterned non-adhesive hydrogel nanosurfaces on the self-assembly of highly ordered colloids. Polyethylene glycol (PEG) hydrogel is employed as the substrate material in the study, for its desired non-adhesive property, and biocompatibility as well as photopatternability. Ultrafine PEG features are photopatterned onto glass substrates with minimal feature resolution of 500 nm using ultraviolet or deep ultraviolet exposure. By simply controlling the colloidal concentration of the nanoassembly solutions and the dimensions of the wells, a range of highly organized nanocolloidal patterns are formed inside the PEG wells. Unlike the traditional surface modification techniques, ours takes advantage of the unique non-adhesive property of PEG hydrogels to achieve extremely high selectivity in the pattern-assisted nanoassembly. Our experiments show that with oxygen plasma treatment, the non-adhesive property of the PEG surface deteriorates significantly, leading to non-selective assembly with complete surface coverage of nanocolloidal beads under the same processing condition. Therefore, benefiting from the unique non-adhesive surface property, the pattern-assisted nanoassembly method enables a highly predictable and robust process for colloidal nanofabrication, and the obtained nanocolloidal arrays with well organized patterns could potentially find applications in photonic crystal fabrication, biological sensing and analytical detection. [ABSTRACT FROM AUTHOR]

Published
2009
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results