The porous structure of biodegradable scaffolds obtained with supercritical CO2 as foaming agent

2007 ◽  
pp. 681-688 ◽  
Author(s):  
S. Blaeher ◽  
C. Calberg ◽  
G. Kerckhofs ◽  
A. Léonard ◽  
M. Wevers ◽  
...  
Keyword(s):  
Porous Structure ◽  
Supercritical Co2 ◽  
Foaming Agent ◽  
Biodegradable Scaffolds

Characterization of the porous structure of biodegradable scaffolds obtained with supercritical CO2 as foaming agent

2007 ◽  
Vol 15 (4) ◽  
pp. 397-403 ◽  
Author(s):  
Angélique Léonard ◽  
Cedric Calberg ◽  
Greet Kerckhofs ◽  
Martine Wevers ◽  
Robert Jérôme ◽  
...  
Keyword(s):  
Porous Structure ◽  
Supercritical Co2 ◽  
Foaming Agent ◽  
Biodegradable Scaffolds

USE OF THE MICROWAVE ENERGY FOR ALUMINUM WASTE FOAMING

2019 ◽  
Vol 25 (4) ◽  
pp. 43-49
Author(s):  
LUCIAN PAUNESCU ◽  
MARIUS FLORIN DRAGOESCU ◽  
SORIN MIRCEA AXINTE ◽  
ANA CASANDRA SEBE
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Porous Structure ◽  
Powder Mixture ◽  
Aluminum Foam ◽  
Fine Powder ◽  
Microwave Energy ◽  
Raw Material ◽  
Foaming Agent ◽  
Foaming Process

The paper presents an aluminum foam experimental technique using the microwave energy. The raw material was recycling aluminum waste processed by ecological melting and gas atomizing to obtain the fine powder required in the foaming process. The powder mixture was completed with dolomite as a foaming agent. The products had a fine and homogeneous porous structure (pore size between 0.4-0.9 mm). The density (1.17-1.19 g/cm3), the compressive strength (6.83-7.01 MPa) and the thermal conductivity (5.71-5.84 W/m·K) had values almost similar to the foams made by conventional methods.

Study of the Water-Glass Role in the Foam Glass Synthesis Using Glycerol Foaming Agent

2021 ◽  
Vol 316 ◽  
pp. 153-158
Author(s):  
Boris M. Goltsman ◽  
Lyubov A. Yatsenko ◽  
Natalia S. Goltsman
Keyword(s):  
Porous Structure ◽  
Structure Formation ◽  
Water Glass ◽  
Glass Batch ◽  
Foam Glass ◽  
Foaming Agent ◽  
Additive Type ◽  
Highly Porous ◽  
Material Porosity

The article discusses the peculiarities of the "water-glass – glycerol" foaming mixture components interaction during foam glass synthesis. The important role of the foaming additive type in the foam glass porous structure formation was described, the main foaming substances were listed. The obtaining and researching technology of the samples was described, the compositions of the initial batches using the "water-glass – glycerol" mixture were developed. It was shown that a material with a highly porous structure and density below 500 kg/m3 can be obtained only with the combined introduction of water-glass and glycerol. In this case, mixtures with a predominance of water-glass in the foaming mixture possess optimal properties. Using DSC, it was shown that the addition of water-glass to the mixture completely eliminates the evaporation of glycerol at lower temperatures and intensifies its combustion at higher temperatures. Thus, the addition of water-glass to the glycerol-based foam glass batch allows glycerol to be saved up to higher temperatures that increases the resulting material porosity.

The Research on Porous Structure of Super Absorbent Polymer Preparation by Inverse Suspension Method

2013 ◽  
Vol 320 ◽  
pp. 544-549
Author(s):  
Zhi Yu ◽  
Jiao Lei ◽  
Li Qun Zhao
Keyword(s):  
Porous Structure ◽  
Absorption Rate ◽  
Cross Linking ◽  
Water Absorbency ◽  
Mixed Solution ◽  
Super Absorbent Polymer ◽  
Foaming Agent ◽  
Monomer Ratio ◽  
Absorbent Polymer

Porous structure of the super absorbent polymer (SAP) was synthesized through inverse suspension method by adding acrylic acid (AA) and acrylic amide (AM) as monomer,N,N'-Methylene-bis-acrylamide (MBA) as cross-linking agent, the mixed solution of methanol and ethanol as pore-foaming agent. The factors that influenced the bibulous performance of the super absorbent polymer were studied including the dosage of cross-linking agent, the dosage of pore-foaming agent, monomer ratio, revolving speed. The Internal structure and surface morphology of SAP was characterized by scanning electron microscopy (SEM). It indicated that when the monomer ratio wasm(AM):m(AA)=1:2; the weight rate of cross-linking agent and pore-foaming agent were 0.06%(compared with the quality of the monomer) and 9%, the product attained the best water absorbency of 2909 g/g in distilled water, the saline absorbency was 124.5 g/g; the water absorption rate was 10. Meanwhile, SEM showed that the structure of the copolymer was full of holes.

Design of a Multifunctional Porous Coaxial Electrospun Mesh Using Polycaprolactone (PCL) and Poly Butylene Adipate-CO-Terephthalate (PBAT)

2016 ◽  
Author(s):  
Hussain R. Rizvi ◽  
Nandika D'Souza
Keyword(s):  
Tensile Testing ◽  
Supercritical Co2 ◽  
Fiber Diameter ◽  
Three Dimensional ◽  
Thermal Characteristics ◽  
Mechanical Analysis ◽  
Delivery Vehicle ◽  
Foaming Agent ◽  
Sem Image ◽  
Coaxial Fibers

In this paper, we formulate a method to create a potential drug delivery vehicle and scaffold architecture of coaxial electrospun fibers. Having the capability to introduce porosity either in core or sheath of the fiber using supercritical CO2 as a foaming agent is utilized. Polycaprolactone (PCL) and Poly butylene adipate-co-terephthalate (PBAT) were used because of their biodegradable and biocompatible nature. Physical morphology of the porous coaxial fibers was studied using Scanning Electron Microscopy (SEM), Image J software was used to quantify the pore size and fiber diameter. Dynamic Mechanical Analysis (DMA) and Tensile Testing of the three-dimensional fibrous mesh was done to determine the mechanical properties of the porous structure. Differential Scanning Calorimeter (DSC) was used to study the thermal characteristics of the mesh.

The effect of supercritical CO2 as a reversible plasticizer and foaming agent on the hot stage extrusion of itraconazole with EC 20cps

2007 ◽  
Vol 40 (1) ◽  
pp. 153-162 ◽  
Author(s):  
Geert Verreck ◽  
Annelies Decorte ◽  
Koen Heymans ◽  
Jef Adriaensen ◽  
Dehua Liu ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Foaming Agent

A Stereolithography-Based Sugar Foaming Method for Porous Strucutre Fabrication

2016 ◽  
Author(s):  
Xuan Song ◽  
Zhuofeng Zhang ◽  
Zeyu Chen ◽  
Yong Chen
Keyword(s):  
Porous Structure ◽  
High Surface ◽  
High Surface Area ◽  
Porous Polymer ◽  
Solid Loading ◽  
Porous Structures ◽  
Large Area ◽  
Foaming Agent ◽  
Stress Transmission ◽  
Limited Accuracy

Porous structure has wide application in industry, thanks to some of its special properties such as low density, low thermal conductivity, high surface area and efficient stress transmission. Both templating and foaming agent methods are used to fabricate porous structures. However, these methods can only produce simple geometries. In recent years, many research studies have been done to use additive manufacturing (AM), e.g. stereolithography (SLA), in the fabrication of porous structure, but the porosity that can be achieved is relatively small due to their limited accuracy in building micro-scale features on a large area. This paper presents a projection based SLA process to fabricate porous polymer structures using sugar as the foaming agent. With a solid loading of 50wt% of the sugar in the resin, the method can achieve a porosity over 50%. This method can be used to increase the porosity achieved by current SLA methods by over 100%.

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