Preparation of Antheraea pernyi Silk Fibroin/Chitosan Blend Scaffolds

2011 ◽  
Vol 140 ◽  
pp. 12-16
Author(s):  
Ting Zhao ◽  
Ceng Zhang ◽  
Qiang Tang ◽  
Shu Qin Yan ◽  
Ming Zhong Li
Keyword(s):  
Cell Adhesion ◽  
Silk Fibroin ◽  
Freeze Drying ◽  
Pore Diameter ◽  
Freezing Temperature ◽  
Process Conditions ◽  
Average Pore ◽  
Antheraea Pernyi ◽  
Preparation Conditions ◽  
The Relationship

In this work, Antheraea pernyi silk fibroin (ASF) /chitosan (CS) blend scaffolds were prepared by freeze-drying. The relationship between preparation conditions and morphological structures of blend scaffolds was also studied. The results indicated that the porosity and pore diameter of the ASF /CS scaffolds decreased with increasing of the proportion of chitosan and decreasing of the freezing temperature. By changing the process conditions, the average pore diameter and porosity of ASF/CS scaffolds could be adjusted in the range of 134 - 527 μm and 71 - 91% respectively. Compared with the pure ASF or CS materials, the ASF / CS (60/40) blend materials were more favor of cell adhesion.

Structure of Antheraea pernyi/Bombyx mori Silk Fibroin Scaffolds

2012 ◽  
Vol 535-537 ◽  
pp. 2321-2325 ◽  
Author(s):  
Xiufang Wu ◽  
Yu Hong Jiao ◽  
Gui Yang Liu ◽  
Shu Qin Yan ◽  
Ming Zhong Li
Keyword(s):  
Pore Structure ◽  
Bombyx Mori ◽  
Silk Fibroin ◽  
Pore Diameter ◽  
Tissue Engineering Scaffolds ◽  
Average Pore ◽  
Antheraea Pernyi ◽  
Condensed Structure ◽  
Α Helix ◽  
Blend Ratios

As the tissue engineering scaffolds, the pore structure and condensed structure of silk fibroin scaffolds should be adjusted and controlled. In this study, Antheraea pernyi/Bombyx mori (A. p/B. m) silk fibroin blend scaffolds were prepared by freeze-drying. The influence of blend ratios on the pore structure and condensed structure of the scaffolds was investigated. The results showed that the average pore diameter of the blend scaffolds changed from 56 to 326 μm. Due to the difference of properties and the macromolecules aggregation status of two silk fibroin solutions, the pore diameter, content of α-helix and crystallinity of the scaffolds decreased with the increasing of the proportion of B. m silk fibroin. By adjusting the blend ratios, the pore structure and condensed structure of A. p/B. m silk fibroin blend scaffolds could be controlled.

Polydopamine-Coated Antheraea pernyi (A. pernyi) Silk Fibroin Films Promote Cell Adhesion and Wound Healing in Skin Tissue Repair

2019 ◽  
Vol 11 (38) ◽  
pp. 34736-34743 ◽  
Author(s):  
Jie Wang ◽  
Yuping Chen ◽  
Guanshan Zhou ◽  
Yuyin Chen ◽  
Chuanbin Mao ◽  
...  
Keyword(s):  
Wound Healing ◽  
Cell Adhesion ◽  
Silk Fibroin ◽  
Tissue Repair ◽  
Skin Tissue ◽  
Antheraea Pernyi ◽  
Promote Cell Adhesion

Fabrication of Low Cost Membrane from Anodic Aluminum Oxide

2017 ◽  
Vol 751 ◽  
pp. 363-367
Author(s):  
Peerawith Sumtong ◽  
Apiluck Eiad-Ua
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Pore Diameter ◽  
Average Pore Diameter ◽  
Process Conditions ◽  
Low Grade ◽  
Pore Density ◽  
Average Pore ◽  
Anodic Aluminum ◽  
Interpore Distance

Anodic Aluminum Oxide (AAO) membrane has been successfully fabricated from two-step anodization with aluminum low grade (Al6061). The pore density, the pore diameter, and the interpore distance can be controlled by varying anodization process conditions. However, there are limits to control the mechanical strength and growth of AAO arrays, such as pore density, pore diameter and interpore distance. In this research the self-organized two-step anodization is carried out varying time at 24, 48 and 72 hours, respectively with 40V at the low temperature 2-5°C. The optimum conditions of AAO with two-step anodization is 40V for 48 hr. Finally, AAO substrate is separated from aluminum low-grade and enlarged pore diameter with pore widening process by 5% H3PO4. The physical properties were investigated by mean of field emission scanning electron microscope (FE-SEM) show that the average pore diameter and average interpore distance increase with the anodization time. Al6061 Aluminum substrate can be used to fabricate a nanoporous AAO film with an average pore diameter and average interpore distance larger than 70 and 90 nanometers, respectively but less mechanical stability.

scholarly journals Experimental Study of the Independence of Diffusion and Hydrodynamic Permeability Coefficients in Collodion Membranes

1960 ◽  
Vol 43 (3) ◽  
pp. 523-532 ◽  
Author(s):  
Elliott Robbins ◽  
Alexander Mauro
Keyword(s):  
Experimental Study ◽  
Permeability Coefficient ◽  
Pore Diameter ◽  
Irreversible Thermodynamics ◽  
Average Pore Diameter ◽  
Average Pore ◽  
Flux Data ◽  
Two Parameters ◽  
The Relationship ◽  
Hydrodynamic Permeability

The two parameters usually invoked when discussing transport across membranes are the "diffusion permeability coefficient" and the "hydrodynamic permeability coefficient." In this study the magnitude of these two coefficients is established experimentally for collodion membranes of differing porosities. The hydrodynamic permeability is predominant while convergence of the two permeabilities tends to obtain as the membranes become less coarse. The flux data obtained are used to calculate "average pore diameter" and the meaningfulness of these calculations is interpreted. The relationship between the two coefficients and transport across membranes as treated by the system of irreversible thermodynamics is discussed.

scholarly journals Relationship between the Shear Strength and Microscopic Pore Parameters of Saline Soil with Different Freeze-Thaw Cycles and Salinities

Symmetry ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 1709
Author(s):  
Jiaqi Wang ◽  
Qing Wang ◽  
Sen Lin ◽  
Yan Han ◽  
Shukai Cheng ◽  
...  
Keyword(s):  
Shear Strength ◽  
Pore Structure ◽  
Pore Diameter ◽  
Saline Soil ◽  
Soil Samples ◽  
Average Pore Diameter ◽  
Failure Strength ◽  
Average Pore ◽  
Freeze Thaw ◽  
The Relationship

Saline soil is a widely distributed special soil with poor engineering properties. In seasonally frozen regions, the poor properties of saline soil will cause many types of engineering damage such as road boiling, melt sinking, and subgrade instability. These engineering failures are closely related to the shear strength of saline soil. However, there are relatively few studies on saline soil in cold regions. The strength of the soil is always determined by its microstructure; therefore, the study aims to investigate the relationship between the shear strength and microscopic pore structure of saline soil with different freeze–thaw cycles and salinities. The shear strength characteristics of saline soil with different salinities subjected to different freeze–thaw cycles were obtained by triaxial tests. In addition, the microstructure of the soil samples was investigated by scanning electron microscopy (SEM) tests, and the microscopic pore parameters of the soil samples, including porosity (N), average pore diameter (D¯), average shape coefficient (K), surface fluctuation fractal dimension (F), and orienting probability entropy (Hm), were obtained by image processing software quantitatively. Based on the experimental results, the influence of freeze–thaw cycles and salinity on the shear strength characteristics and microstructure of the soil samples were analyzed. Besides that, in order to effectively eliminate the collinearity between independent variables and obtain a stable and reasonable regression model, principal component regression (PCR) analysis was adopted to establish the relationship between the microscopic pore parameters and the failure strength of the soil samples. The fitting results demonstrated that the failure strength of saline soil is mainly related to the size and direction of the pores in the soil, and it has little correlation with pore shape. The failure strength of the soil was negatively correlated with the average pore diameter (D¯) and porosity (N), and it was positively correlated with the orienting probability entropy of the pores (Hm). This study may provide a quantitative basis for explaining the variation mechanism of the mechanical properties of saline soil from a microscopic perspective and provide references for the symmetry between the changes of the macroscopic properties and microscopic pore structure of the saline soil in cold regions.

Nanoporous Anodic Aluminum Oxide (AAO) Thin Film Fabrication with Low-Grade Aluminium

2016 ◽  
Vol 872 ◽  
pp. 152-156
Author(s):  
Peerawith Sumtong ◽  
Apiluck Eiad-Ua ◽  
Khattiya Chalapat
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Pore Diameter ◽  
Average Pore Diameter ◽  
Process Conditions ◽  
Low Grade ◽  
Average Pore ◽  
Aluminium Substrate ◽  
Anodization Time ◽  
Anodic Aluminum

Anodic aluminum oxide (AAO) is well known for its nanoscopic structures and its applications in microfluidics, sensors and nanoelectronics. The pore density, the pore diameter, and the interpore distance of an AAO substrate can be controlled by varying anodization process conditions. In this research, the self-organized two-step anodization is carried out with a low-grade (Al6061) aluminium substrate using a 40V voltage at the temperature of 2 to 5 °C. Three experiments are done with the anodization time of 24 hours, 48 hours and 72 hours. The structural features of AAO are characterized by a field emission electron microscope (FE-SEM). The data from FE-SEM show that the average pore diameter increases with the anodization time, and that the Al6061 aluminium substrate can be used to fabricate a nanoporous AAO film with an average pore diameter smaller than 17 nanometers.

Research on the Relationship between Permeability and Pore Size Characteristics of Microporous Nonwoven Geotextile

2013 ◽  
Vol 753-755 ◽  
pp. 792-797 ◽  
Author(s):  
Bing Xuan Ni ◽  
Peng Zhang
Keyword(s):  
Pore Size ◽  
Pore Diameter ◽  
Average Pore Diameter ◽  
Flow Index ◽  
Hydraulic Permeability ◽  
Measuring Instrument ◽  
Average Pore ◽  
Vertical Permeability ◽  
Nonwoven Geotextile ◽  
The Relationship

The hydraulic permeability performance of geosynthetics is an important functional technical index in the field of engineering application. In this paper, the pore size characteristics of a series different specifications of spunbond and needlepunched nonwoven geotextile has tested through capillary flow aperture measuring instrument, including average pore diameter, maximum pore size and pore size distribution. The permeability characteristics of nonwoven geotextile has measured by vertical permeability measuring instrument, including flow index and vertical permeability coefficient. We study on the compressive properties of nonwoven geotextile under the different pressure, through the relationship between the average pore diameter and flow index to fit curve, and built the regression equation, so we can calculate and predict the water permeability performance through pore size Characteristics.

Study on Antheraea Pernyi Silk Fibroin Porous Materials

2011 ◽  
Vol 332-334 ◽  
pp. 1718-1721
Author(s):  
Li Mao ◽  
Xi Long Wu ◽  
Yu Liu ◽  
Shen Zhou Lu
Keyword(s):  
Porous Materials ◽  
Silk Fibroin ◽  
Average Pore Size ◽  
Diffraction Method ◽  
Random Coil ◽  
X Ray Diffraction ◽  
Average Pore ◽  
Antheraea Pernyi ◽  
Thiocyanate Solution ◽  
Α Helix

Antheraea pernyi silk fibroin (ASF) solution was prepared by dissolving Antheraea pernyi silk fiber in lithium thiocyanate solution. The ASF/1,4-butanediol (ASF/BDO) blend porous materials were prepared with freeze-drying method. The structure of ASF was investigated by the X-ray diffraction method. The result showed that the structure of regenerated ASF scaffold was α-helix and random coil conformation. After ASF mixed with 5 wt% BDO, the structure of ASF was changed to β-sheet and the ASF scaffolds became water-insoluble. There were some small pores and fibrous structure in the big pores and the surface of pores was rough with a great many raised particles. The scaffolds with the average pore size of 300-1000μm and the porosity of 82-92% can efficiently be produced in this paper. Due to avoid the use of organic solvents or harsh chemicals, these new ASF based porous materials provide much more excellent biocompatibility and is expected to be applied to tissue regeneration scaffolds.

scholarly journals Microstructure-Based Relative Humidity in Cementitious System Due to Self-Desiccation

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1214 ◽  
Author(s):  
Yong Zhang ◽  
Xiaowei Ouyang ◽  
Zhengxian Yang
Keyword(s):  
Relative Humidity ◽  
Cement Hydration ◽  
Pore Diameter ◽  
Limestone Powder ◽  
Average Pore ◽  
Binder Ratio ◽  
Internal Relative Humidity ◽  
Cementitious System ◽  
The Relationship ◽  
Cementitious Systems

The internal relative humidity (RH) plays a crucial role in most of the concrete properties. Self-desiccation caused by continuous cement hydration is a major factor affecting the RH of concrete. This paper investigates the relationship between RH and microstructure for cementitious systems in the case of self-desiccation. A series of paste specimens prepared with different binder and water-binder-ratio (w/b) were cured under sealed conditions from 1 day to 1.5 years. The RH and microstructure of the paste specimens were measured. The microstructure characteristics under study include porosity, pore size, evaporable and non-evaporable water content. The results reveal that the RH of cementitious system drops to a great extent in the first 105 days’ hydration and decreases slowly afterwards. The blended materials such as fly ash, slag or limestone powder have different influences on the RH. A mathematical model between RH and the average pore diameter is proposed for cementitious systems under self-desiccation, regardless of age, w/b or cement type.

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