Electrospun Cellulose Acetate Fiber Containing Rubber Extract

2015 ◽  
Vol 1119 ◽  
pp. 329-333 ◽  
Author(s):  
Natthakitta Suwannateep ◽  
Chidchanok Meechaisue ◽  
Hubert Ruch
Keyword(s):  
Cellulose Acetate ◽  
High Surface ◽  
Potential Candidate ◽  
High Porosity ◽  
Fiber Mats ◽  
New Approach ◽  
Surface Areas ◽  
Innovative Products ◽  
Cellulose Acetate Fiber ◽  
First Time

Recent studies on cream of rubber extract (HB) have significantly showed skin improvement results, however, there were color and odor issues. To solve the problems, we successfully produced ultra-fine cellulose acetate (CA) fiber mats (electrospun fibers) containing 1-5 wt% extracts of rubber from Hevea brasilensis without any chemical additions. This new approach has in fact revealed the desired material and biomolecule immobilization. The SEM photographs show the straight and even shaping of the processed HB-CA fibers. The average fiber diameters of the HB-CA fibers ranged between 415 and 585 nm. Moreover, HB-CA solutions containing 1-3% HB extract resulted in a more consistent texture of the fiber mats. This was the first time to produce nanofibers using only rubber extract and cellulose acetate without any other potentially bioactive components involved. This innovation did not only solve the initially addressed color and odor issues, but also provided a new purified material of very small fibers which allows better control of its bioactivity due to the fact that less chemical substances are involved. Its highly interesting characteristics, such as high surface areas to mass ratio, high porosity et al make this result an excellent potential candidate e.g. facial masks, and other innovative products in the field of cosmetics and pharmaceutical industry. Further research is needed and highly promising.

Carboxylate-intercalated layered double hydroxides for H2 sorption

2014 ◽  
Vol 2 (33) ◽  
pp. 13452-13463 ◽  
Author(s):  
Yu-Wei Huang ◽  
Soofin Cheng
Keyword(s):  
Layered Double Hydroxides ◽  
Hydrogen Adsorption ◽  
High Surface ◽  
Surface Areas ◽  
Double Hydroxides ◽  
First Time

Li–Al layered double hydroxides of high surface areas were prepared by intercalating a mixture of arylate and acetate ions, and their hydrogen adsorption capabilities were explored for the first time.

Fabrication and Characterization of Chitosan-Ethylenediaminetetraacetic Acid/Polyvinyl Alcohol Blend Electrospun Nanofibers

2011 ◽  
Vol 194-196 ◽  
pp. 648-651 ◽  
Author(s):  
Natthan Charernsriwilaiwat ◽  
Praneet Opanasopit ◽  
Theerasak Rojanarata ◽  
Tanasait Ngawhirunpat
Keyword(s):  
Polyvinyl Alcohol ◽  
Ethylenediaminetetraacetic Acid ◽  
Electrospun Fiber ◽  
High Surface ◽  
Weight Ratio ◽  
Average Diameter ◽  
High Porosity ◽  
Sem Images ◽  
Fiber Mats ◽  
Small Pore

Electrospinning is a technique use to fabricate ultrafine fibers with diameters in the nanometer range. The electrospun fiber mats have high potentials for many applications, due to their high surface area to volume, high porosity and small pore size. In this study, chitosan-ethylenediaminetetraacetic acid (CS-EDTA)/polyvinyl alcohol (PVA) blend nanofibers were successfully prepared using electrospinning techniques without organic solvent. CS was dissolved in EDTA aqueous solution and then blended with PVA solution at various weight ratios. Physicochemical properties of CS-EDTA/PVA solution such as viscosity, conductivity and surface tension were investigated. The morphology and diameter of the electrospun fiber mats were analyzed by using scanning electron microscopy (SEM). The composite structure was characterized by differential scanning calorimetry (DSC) and fourier transform infrared spectroscopy (FT-IR). SEM images showed that the morphology and diameter of the nanofibers were mainly affected by the weight ratio of the blend. Nanofibers were obtained when the CS-EDTA content was less than 50%wt. The average diameter of the nanofibers was 119-223 nm, and this average diameter decreased with increasing CS-EDTA content. In summary, these CS electrospun nanofiber mats may be proper for the drug delivery or wound dressing application.

scholarly journals The AEROPILs Generation: Novel Poly(Ionic Liquid)-Based Aerogels for CO2 Capture

2021 ◽  
Vol 23 (1) ◽  
pp. 200
Author(s):  
Raquel V. Barrulas ◽  
Clara López-Iglesias ◽  
Marcileia Zanatta ◽  
Teresa Casimiro ◽  
Gonzalo Mármol ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Co2 Capture ◽  
High Porosity ◽  
Climate Change Effects ◽  
Co2 Sorption ◽  
Surface Areas ◽  
Co2 Sorbent ◽  
Poly Ionic Liquid ◽  
Co2 Capture Capacity ◽  
First Time

CO2 levels in the atmosphere are increasing exponentially. The current climate change effects motivate an urgent need for new and sustainable materials to capture CO2. Porous materials are particularly interesting for processes that take place near atmospheric pressure. However, materials design should not only consider the morphology, but also the chemical identity of the CO2 sorbent to enhance the affinity towards CO2. Poly(ionic liquid)s (PILs) can enhance CO2 sorption capacity, but tailoring the porosity is still a challenge. Aerogel’s properties grant production strategies that ensure a porosity control. In this work, we joined both worlds, PILs and aerogels, to produce a sustainable CO2 sorbent. PIL-chitosan aerogels (AEROPILs) in the form of beads were successfully obtained with high porosity (94.6–97.0 %) and surface areas (270–744 m2/g). AEROPILs were applied for the first time as CO2 sorbents. The combination of PILs with chitosan aerogels generally increased the CO2 sorption capability of these materials, being the maximum CO2 capture capacity obtained (0.70 mmol g−1, at 25 °C and 1 bar) for the CHT:P[DADMA]Cl30% AEROPIL.

scholarly journals Nanoporous Crystalline Composite Aerogels with Reduced Graphene Oxide

Molecules ◽  
2020 ◽  
Vol 25 (22) ◽  
pp. 5241
Author(s):  
Christophe Daniel ◽  
Baku Nagendra ◽  
Maria Rosaria Acocella ◽  
Esther Cascone ◽  
Gaetano Guerra
Keyword(s):  
Graphene Oxide ◽  
Benzyl Alcohol ◽  
Reduced Graphene Oxide ◽  
High Surface ◽  
High Porosity ◽  
Surface Areas ◽  
Reduced Graphene ◽  
Fibrillar Morphology ◽  
Composite Aerogels

High-porosity monolithic composite aerogels of syndiotactic polystyrene (sPS) and poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) containing reduced graphene oxide (r-GO) were prepared and characterized. The composite aerogels obtained by supercritical carbon dioxide (scCO2) extraction of sPS/r-GO and PPO/r-GO gels were characterized by a fibrillar morphology, which ensured good handling properties. The polymer nanoporous crystalline phases obtained within the aerogels led to high surface areas with values up to 440 m2 g−1. The role of r-GO in aerogels was studied in terms of catalytic activity by exploring the oxidation capacity of composite PPO and sPS aerogels toward benzyl alcohol in diluted aqueous solutions. The results showed that, unlike sPS/r-GO aerogels, PPO/r-GO aerogels were capable of absorbing benzyl alcohol from the diluted solutions, and that oxidation of c.a. 50% of the sorbed benzyl alcohol molecules into benzoic acid occurred.

scholarly journals Preserving surface area and porosity during fabrication of silicon aerocrystal particles from anodized wafers

2020 ◽  
Author(s):  
C. J. Storey ◽  
E. Nekovic ◽  
A. Kaplan ◽  
W. Theis ◽  
L. T. Canham
Keyword(s):  
Porous Silicon ◽  
Ball Milling ◽  
Surface Area ◽  
Mechanical Milling ◽  
High Surface ◽  
High Porosity ◽  
Processing Times ◽  
Surface Areas ◽  
Processing Techniques ◽  
Very High

Abstract Porous silicon layers on wafers are commonly converted into particles by mechanical milling or ultrasonic fragmentation. The former technique can rapidly generate large batches of microparticles. The latter technique is commonly used for making nanoparticles but processing times are very long and yields, where reported, are often very low. With both processing techniques, the porosity and surface area of the particles generated are often assumed to be similar to those of the parent film. We demonstrate that this is rarely the case, using air-dried high porosity and supercritically dried aerocrystals as examples. We show that whereas ball milling can more quickly generate much higher yields of particles, it is much more damaging to the nanostructures than ultrasonic fragmentation. The latter technique is particularly promising for silicon aerocrystals since processing times are reduced whilst yields are simultaneously raised with ultrahigh porosity structures. Not only that, but very high surface areas (> 500 m2/g) can be completely preserved with ultrasonic fragmentation.

Imaging organic aerogels at the molecular level

1991 ◽  
Vol 49 ◽  
pp. 418-419
Author(s):  
G.C. Ruben ◽  
R.W. Pekala
Keyword(s):  
Pore Size ◽  
High Surface ◽  
Sol Gel ◽  
Acoustic Properties ◽  
Porous Solids ◽  
Dense Matrix ◽  
High Porosity ◽  
Microporous Material ◽  
Surface Areas ◽  
Organic Aerogels

The sol-gel polymerization of metal alkoxides or certain multifunctional organic monomers leads to the formation of highly crosslinked, transparent gels. If the solvent is simply evaporated from the pores of these gels, large capillary forces are exerted, and a collapsed structure known as a xerogel is formed. In order to preserve the gel skeleton, it is necessary to remove the the aforementioned solvent under supercritical conditions. The low density, microporous material that results from this operation is known as an aerogel. Aerogels have an ultrafine cell/pore size (< 500 Å), connected porosity, high surface areas (400-1000 m2/g), and an ultrastructure composed of interconnected colloidal-like particles or polymeric chains with characteristic dimensions of 100 Å. This ultrastructure is responsible for the unique optical, thermal, and acoustic properties of aerogels. For example, the ultrafine cell/pore size minimizes light scattering; and thus, aerogels are transparent porous solids. The high porosity of aerogels makes them excellent insulators with their thermal conductivity being approximately 100X lower than that of the fully dense matrix. Finally, the aerogel skeleton is responsible for the low sound velocities observed in these materials (i.e. 100-300 m/sec).

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