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31 results on '"Chen, Rou-Xi"'

5. Contrastive research on the waterproof and dustproof mechanism of wild silkworm silk and domestic silkworm silk

Author

Chen Rou-xi

Subjects
Wild silk, Artificial materials, Sem study, Polymer science, Chemistry, wild silkworm silk, General Physics and Astronomy, Nanotechnology, General Chemistry, Highly selective, mechanism of waterproof and dustproof, SILK, domestic silkworm silk, selective repulsion, surface morphology, General Materials Science, Lotus effect
Abstract

Wild silk has properties of waterproof and dustproof, but its domestic partner has neither. Scanning electron microscopy (SEM) was used to observe and compare their morphology difference so that the possible mechanism can be elucidated. By the contrastive research, this paper concludes that the mechanism of waterproof and dustproof of wild silk is due to selective repulsion, each hierarchical cascade of nanoparticles can repel either water molecules or fine particles in air. The SEM study reveals that the different nanoparticles with hierarchical structure on the silk surface are main factors of the highly selective repulsion. This theory can also explain the waterproof property of lotus leaf. A better understanding of the repulsion mechanism of wild silk could help the further design of bio-mimetic waterproof/dustproof artificial materials.

Published
2014

6. Comparison between electrospun and Bubbfil-spun Polyether sulfone fibers

Author

Chen Rou-xi, Liu Fu-Juan, and Li Ya

Subjects
chemistry.chemical_classification, Materials science, Electrospinning, porous morphology, difference, General Physics and Astronomy, General Chemistry, Polymer, Sulfone, chemistry.chemical_compound, chemistry, Surface-area-to-volume ratio, Nanofiber, General Materials Science, Fiber, Composite material, Bubble-electrospinning, Porosity, Spinning
Abstract

Electrospinning is a simple method for producing ultrafine fibers, and has attracted much recent interest. The classical approach was either polymer solutions or polymer melts. Bubbfil spinning (e.g. bubble-electrospinning) is a facile method to fabricate nanofibers with high surface area to volume ratio and high porosity. Polyether sulfone (PES) dissolved in N,N-Dimethylacetamide (DMAC) was used in this study to compare fiber morphologies of two technologies at the same spinning conditions. Effects of solution concentration, applied voltage and tip-to-collector distance on the morphology of the fibers were experimentally studied. It revealed that the Bubbfil spinning process is a better candidate for mass-production of nanofiber with controllable morphology.

Published
2014

28. Highly Selective Adsorption of Plants' Leaves on Nanoparticles

Author

Kong, Hai Yan, He, Ji Huan, Chen, Rou Xi, and Wang, Liang

Abstract

Adsorption of fine particles in air by a leaf is studied experimentally. It is found that each leaf can absorb only a kind of particles with almost same size, and it also exhibits high selectivity over other particles. The SEM study reveals that the size of nanopore on the epidermis is a main factor of the highly selective adsorption; the smaller nanopores can absorb larger nanoparticles in air. The morphology of a lotus leaf, which is waterproof and dustproof, has, on the other hand, many short nanofibrils instead of nanopores. It is concluded that the nanoscale geometrical structure of a surface affects its attraction/repulsion property. The experiment also shows that one square millimeter surface with nanopores in diameter of 18 nm can absorb 2 million nanoparticles of about 200 nm in diameter from air in 24 hours. A better understanding of the adsorption/repulsion mechanism could help the further design of bio-mimetic waterproof/dustproof artificial materials and artificial porous materials/fabrics/nonwovens for adsorption of nanoparticles in air.

Published
2008
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29. Silk Cocoon: "Emperor's New Clothes" for Pupa: Fractal Nano-Hydrodynamical Approach

Author

Chen, Rou Xi, Liu, Fu Juan, He, Ji Huan, and Fan, Jie

Abstract

Blossman-Myer and Burggren (Comp. Biochem. Phys. A, 155, 2010,259-263) found that the cocoon of the silkworm, Bombyx mori, while creating a tough barrier offering mechanical protection to the pupa, imposes no barrier to the diffusion of oxygen or water vapor. In view of its mechanical properties, silk cocoon is an "emperor's new clothes" for pupa. A theoretical analysis is given to explain the fascinating phenomenon by a fractal hydrodynamic model for discontinuous membrane composed of hierarchical silk cascade. The model reveals that when the fractal dimensions of the microstructure of the cocoon meet a special condition, air and water vapor can flow through the cocoon as if there were no cocoon. However, at extremes of weather, the cocoon is an excellent thermal protection for both high and cool temperatures. A better understanding of the cocoon mechanism could help the further design of bio-mimetic artificial clothes for special applications.

Published
2008
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30. Waterproof and Dustproof of Wild Silk: A Theoretical Explanation

Author

Chen, Rou Xi, He, Ji Huan, and Kong, Hai Yan

Abstract

Nanopore on a surface (e.g. the epidermis of a leaf) can absorb nanoparticles, and nanoparticles on a surface play a contrary role. Comparison of wild silk with Bombyx mori silk reveals that the former has obvious nanoparticle-like crystals, which can repel water or dust, resulting in waterproof and dustproof of wild silk.

Published
2008
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31. A short remark on the molar electronic transition energy E T (30) of the solvatochromic pyridinium N-phenolate betain dye 30.

Author

Chen, Rou-xi, Kong, Hai-Yan, He, Ji-Huan, and Liu, Fu-Juan

Subjects
*FLUORESCENCE resonance energy transfer, *SOLVATOCHROMISM, *PYRIDINIUM compounds, *PHENOXIDES, *BETAINE, *ORGANIC dyes
Abstract

Abstract: A relationship between the molar electronic transition energy E T (30) of the solvatochromic pyridinium N-phenolate betain dye 30 and the relative permittivity is established using an exponential function. [Copyright &y& Elsevier]

Published
2014
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