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%.

Porous Structure Fabrication Using a Stereolithography-Based Sugar Foaming Method

2016 ◽  
Vol 139 (3) ◽  
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 due to some of its unique properties such as low density, low thermal conductivity, high surface area, and efficient stress transmission. Both templating and foaming agent methods have been used to fabricate porous structures. However, these methods can only fabricate simple geometries. In recent years, many studies have been done to use additive manufacturing (AM), e.g., stereolithography apparatus (SLA), in the fabrication of porous structure; however, the porosity that can be achieved is relatively small due to the limited accuracy in building microscale features on a large area. This paper presents a projection-based SLA process to fabricate porous polymer structures using sugar particles as the foaming agent. With a solid loading of 50 wt.% of sugar in photocurable resin, the method can achieve a structure with much higher porosity. As shown in our results, the method can increase the porosity of fabricated scaffold structures by two times when compared to the current SLA method.

Lawsone Derived Zn (II) and Fe (III) Metal Organic Frameworks with pH Dependent Emission for Controlled Drug Delivery

2021 ◽  
Author(s):  
Sirajunnisa P ◽  
Liz Hannah George ◽  
Narayanapillai Manoj ◽  
Prathapan S ◽  
G.S. Sailaja
Keyword(s):  
Drug Delivery ◽  
Porous Structure ◽  
High Surface ◽  
Metal Organic Frameworks ◽  
High Surface Area ◽  
Controlled Drug Delivery ◽  
Sensing Applications ◽  
Porous Carriers ◽  
Metal Organic ◽  
Ph Dependent

Fluorescent biocompatible porous carriers have been investigated as suitable probes for drug delivery and sensing applications owing to their intrinsic fluorescence and high surface area originating from their porous structure...

Development of Porous Polypyrrole Electrode for Fuel Cell Applications

2013 ◽  
Vol 545 ◽  
pp. 77-81
Author(s):  
Korakot Sombatmankhong ◽  
Adrian C. Fisher
Keyword(s):  
Methylene Blue ◽  
Fuel Cell ◽  
Solvent Extraction ◽  
Electrical Properties ◽  
Composite Film ◽  
Porous Structure ◽  
High Surface ◽  
High Surface Area ◽  
Novel Material ◽  
Bare Gold

One method of increasing number of reaction sites was by the introduction of a porous structure into the electrodes to provide a high surface area for catalyst deposition. This work focused on the development of a method for the fabrication of a porous polypyrrole electrode; a mixture of two monomers (i.e. pyrrole and methylene blue) was simultaneously electropolymerised and one of which was selectively removed from the composite film by solvent extraction. The porous polypyrrole had a suitably porous structure whilst maintaining excellent electrical properties. The application of this novel material to miniaturized fuel cells was shown to have improved power density of 2-fold and 3-fold higher than bulk polypyrrole and bare gold electrodes respectively.

Transport in Stochastic Fibrous Networks

2000 ◽  
Vol 123 (1) ◽  
pp. 12-19 ◽  
Author(s):  
X. Cheng ◽  
A. M. Sastry ◽  
B. E. Layton
Keyword(s):  
Volume Fraction ◽  
High Surface ◽  
High Surface Area ◽  
Statistical Technique ◽  
Porous Structures ◽  
Fibrous Materials ◽  
Aspect Ratios ◽  
And Performance ◽  
2D Network ◽  
Key Questions

Some fundamental issues concerning the design and performance of stochastic porous structures are examined, stemming from application of advanced fibrous electrode substrates in NiMH automotive cells. These electrodes must resist corrosion and local failures under hundreds of charge/discharge cycles. Such fibrous materials can be effectively used as substrates for chemical reactions because of their combinations of high surface area and high conductivity. Key questions concerning the relationships among connectivity and conductivity, scale and variability in material response are addressed. Two techniques are developed and compared for use in predicting these materials’ conductivity. The first approach uses a statistical technique in conjunction with an adaptation of classic micromechanical models. The second approach uses the statistical generation technique, followed by an exact calculation of 2D network conductivity. The two techniques are compared with one another and with classic results. Several important conclusions about the design of these materials are presented, including the importance of use of fibers with aspect ratios greater than at least 50, the weak effect of moderate alignment for unidirectional conductivity, and the weak power-law behavior of conductivity versus volume fraction over the range of possible behaviors.

scholarly journals Use of natural diatoms for drug delivery

Bionatura ◽  
2020 ◽  
Vol 5 (3) ◽  
pp. 1275-1279
Author(s):  
Dario Castro ◽  
Joselyn Cuasquer ◽  
Eva Chavez
Keyword(s):  
Drug Delivery ◽  
Porous Structure ◽  
Pore Structure ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Processing Cost ◽  
Silica Materials ◽  
Different Characteristics ◽  
Ordered Porous

Diatoms are microalgae organisms that have a cover of silica, with a fascinating ordered porous structure that varies in size, giving them some different characteristics. Because of their different size, shape, and structure, it has incredible properties, letting them be capable of been functionalized with other particles. Therefore, due to the ordered pore structure, the high surface area, biocompatibility, availability, and low processing cost, they present a growing potential for drug delivery when talking about silica materials, natural and synthetic, not to mention that is less expensive and a green alternative.

Fabrication of Gelatin Complexes/Bio-Nanocellulose Nanostructured Composite Mats

2018 ◽  
Vol 936 ◽  
pp. 142-147 ◽  
Author(s):  
Siriporn Taokaew ◽  
Muenduen Phisalaphong
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Porous Structure ◽  
High Surface ◽  
High Surface Area ◽  
Acetobacter Xylinum ◽  
Kidney Cells ◽  
Gelatin Solution ◽  
Green Method ◽  
Nanostructured Composite

Fabrication of gelatin complexes/bio-nanocellulose was achieved using facile and green method to fabricate nanostructured composite mats. The bio-nanocellulose was synthesized usingAcetobacter xylinumbacteria. The bio-nanocellulose pellicle was submerged in gelatin solution and thereafter complexing. Gelatin complex nanospheres were found to adsorb on and inside bio-nanocellulose mats. The nanocomposite mats exhibited optical transparency, high surface area with porous structure, antimicrobial activity againstStaphylococcus aureus,and non-cytotoxicity to Vero monkey kidney cells.

Mesoporous BN and BCN nanocages with high surface area and spherical morphology

2014 ◽  
Vol 16 (43) ◽  
pp. 23554-23557 ◽  
Author(s):  
Ulka Suryavanshi ◽  
Veerappan V. Balasubramanian ◽  
Kripal S. Lakhi ◽  
Gurudas P. Mane ◽  
Katsuhiko Ariga ◽  
...  
Keyword(s):  
Low Temperature ◽  
Porous Structure ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Spherical Morphology

A low temperature synthesis of novel mesoporous BN and BCNs with cage type porous structure, high surface area, and spherical morphology using carbon nanocages has been reported.

Sign in / Sign up

Export Citation Format

Share Document