Recovery of uranium from seawater. XII. Preparation and characterization of lightly crosslinked highly porous chelating resins containing amidoxime groups

1992 ◽  
Vol 46 (1) ◽  
pp. 129-142 ◽  
Author(s):  
Hiroaki Egawa ◽  
Nalan Kabay ◽  
Taketomi Shuto ◽  
Akinori Jyo
Keyword(s):  
Chelating Resins ◽  
Highly Porous ◽  
Uranium From Seawater

Characterization of highly porous nanoparticle deposits by permeance measurements

2011 ◽  
Vol 207 (1-3) ◽  
pp. 279-289 ◽  
Author(s):  
Tobias D. Elmøe ◽  
Antonio Tricoli ◽  
Jan-Dierk Grunwaldt
Keyword(s):  
Highly Porous

scholarly journals Thermal and morphological characterization of highly porous nanocomposites for possible application in potassium controlled release

2017 ◽  
Vol 131 (3) ◽  
pp. 2205-2212 ◽  
Author(s):  
Carlos Roberto Ferreira Junior ◽  
Fabrício Nunes Tanaka ◽  
Adriel Bortolin ◽  
Márcia Regina de Moura ◽  
Fauze Ahmad Aouada
Keyword(s):  
Controlled Release ◽  
Morphological Characterization ◽  
Porous Nanocomposites ◽  
Highly Porous

Preparation and Characterization of Ni/ZrCoCe Stack Getter Films

2019 ◽  
Vol 944 ◽  
pp. 619-624
Author(s):  
Peng Yuan ◽  
Yao Zong Sui ◽  
Xiao Zhang ◽  
Hao Liu ◽  
Feng Wei ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Magnetron Sputtering ◽  
Film Surface ◽  
Protective Layer ◽  
Sem Analysis ◽  
And Diffusion ◽  
Highly Porous ◽  
Scanning Electron

In order to improve the oxidation resistance of the ZrCoCe getter, highly porous Ni/ZrCoCe stack getter films were grown by the magnetron sputtering method. Scanning electron microscope (SEM) analysis indicate that the Ni/ZrCoCe stack film is composed of isolated columns. The film surface with cauliflower-like topography is formed among finely packed nanocrystals. Gas sorption investigation shows that the Ni/ZrCoCe stack film can be activated at 300 °C for 30 min and exhibits more favorable sorption capability than ZrCoCe bi-layered film. XPS results show that the Ni protective layer can play an important role in protecting the ZrCoCe film against oxidation. It can also improve the surface dissociation and diffusion of H2.

Characterization of novel calcium hydroxide‐mediated highly porous chitosan‐calcium scaffolds for potential application in dentin tissue engineering

2020 ◽  
Vol 108 (6) ◽  
pp. 2546-2559 ◽  
Author(s):  
Diana Gabriela Soares ◽  
Ester Alves Ferreira Bordini ◽  
Fernanda Balestrero Cassiano ◽  
Erika Soares Bronze‐Uhle ◽  
Leandro Edgar Pacheco ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Calcium Hydroxide ◽  
Potential Application ◽  
Porous Chitosan ◽  
Highly Porous

scholarly journals Synthesis and Characterization of a New Collagen-Alginate Aerogel for Tissue Engineering

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Abraham Muñoz-Ruíz ◽  
Diana M. Escobar-García ◽  
Mildred Quintana ◽  
Amaury Pozos-Guillén ◽  
Héctor Flores
Keyword(s):  
Tissue Engineering ◽  
Cell Attachment ◽  
Supercritical Drying ◽  
Drying Process ◽  
Sem Images ◽  
Promote Cell Migration ◽  
Carbon Based Nanomaterials ◽  
Highly Porous ◽  
Alginate Scaffold

Scaffolds have been used as extracellular matrix analogs to promote cell migration, cell attachment, and cell proliferation. The use of aerogels and carbon-based nanomaterials has recently been proposed for tissue engineering due to their properties. The aim of this study is to develop a highly porous collagen-alginate(-graphene oxide) aerogel-based scaffold. The GO synthesis was performed by Hummers method; a collagen-alginate and collagen-alginate-GO hydrogel were synthetized; then, they were treated by a supercritical drying process. The aerogels obtained were evaluated by SEM and FTIR. Osteoblasts were seeded over the scaffolds and evaluated by SEM. According to the characterization, the aerogels showed a highly porous interconnected network covered by a nonporous external wall. According to the FTIR, the chemical functional groups of collagen and GO were maintained after the supercritical process. The SEM images after cell culture showed that a collagen-alginate scaffold promotes cell attachment and proliferation. The alginate-collagen aerogel-based scaffold could be a platform for tissue engineering since it shows adequate properties. Further studies are needed to determine the cell interactions with GO.

Atmospheric Acetic Acid Pulping of Rice Straw IV: Physico-Chemical Characterization of Acetic Acid Lignins from Rice Straw and Woods. Part 2. Chemical Structures

Holzforschung ◽  
1999 ◽  
Vol 53 (6) ◽  
pp. 590-596 ◽  
Author(s):  
Xue-Jun Pan ◽  
Yoshihiro Sano
Keyword(s):  
Acetic Acid ◽  
Rice Straw ◽  
Chemical Characterization ◽  
Raw Material ◽  
Permanganate Oxidation ◽  
Chemical Structures ◽  
Chelating Resins ◽  
Elementary Analysis ◽  
Physico Chemical

Summary Acetic acid lignins from rice straw (RLs), birch (BL) and fir (FL) were chemically characterized by means of elementary analysis, functional groups analysis, alkaline nitrobenzene and permanganate oxidation, Mannich reactivity and other techniques. The results showed that RLs had higher contents of residual polysaccharide and protein, and remarkably fewer acetyl groups than BL and FL. Results of nitrobenzene and permanganate oxidation indicated that RLs were remarkably more condensed than the native lignin in rice straw. In addition, the results of Mannich reactivity showed that RLs were more reactive toward modification than BL and FL, and might be a good raw material for lignin derivatives, such as lignin adhesives and chelating resins.

Characterization of Pore Diameters in Highly Porous Media

2003 ◽  
Author(s):  
H. L. Pan ◽  
O. Pickena¨cker ◽  
D. Trimis
Keyword(s):  
Porous Medium ◽  
Porous Media ◽  
Pore Diameter ◽  
Laminar Flame ◽  
Combustible Mixture ◽  
Critical Conditions ◽  
Flame Velocity ◽  
Geometrical Properties ◽  
Highly Porous

In this paper, a method for the experimental characterization of the equivalent pore diameter of highly porous open structures is presented. The commonly used characterization of such structures through geometrical properties like ppi number (porous per inch) and porosity proves to be not sufficient for the characterization of length scales related to heat and mass transfer. The procedure used here utilizes the quenching limits for flame propagation as characterization criterion. The determined equivalent pore diameter corresponds to the quenching diameter for a tube-geometry filled with the same combustible mixture. The quenching limit was determined by adjusting critical conditions, which are defined by a constant critical Pe´clet number comprising the laminar flame velocity instead of the flow velocity. Variations of oxygen content and air ratio were used in order to change the laminar flame speed and find the quenching limit for a given porous medium. The equivalent pore diameter determined with this method is a characteristic length scale of the porous medium geometry and is related to the heat transfer between the gas phase and the solid porous structure. The validation of the method was performed on sphere packings with well-documented properties. Several practically relevant highly porous media like foams and fabric lamellae structures were characterized and the results are discussed. Based on the effective heat conductivity (EHC) models of Zehner, Bauer and Schlu¨nder [1–3] for packed beds, an adapted model for foam structures was developed. The adapted model utilizes the equivalent pore diameters determined in the paper and predictions are presented.

Synthesis and Characterization of Active Biocarbon Material for Use in Cosmetics and Personal Care Products

2020 ◽  
Vol 841 ◽  
pp. 266-272
Author(s):  
Sannasi Abdullah Palsan ◽  
Jia Yi Lim ◽  
Abdullah Nor Asfaliza
Keyword(s):  
Personal Care Products ◽  
Synthesis And Characterization ◽  
Personal Care ◽  
Optimum Conditions ◽  
Color Analysis ◽  
Impregnation Ratio ◽  
Cosmetic Formulation ◽  
Methylene Blue Number ◽  
Highly Porous

Consumer’s preference towards organic material enriched nature based green products in the cosmetics and personal care industry have intensified over the years. This paper shares the synthesis and characterization of an active organic biocarbon material derived from carbonized powdered coconut shell by bicarbonate cured activation for use in charcoal-based cosmetic and personal care products. The optimum conditions for activation was observed at 800 °C, run for 180 min, with a bicarbonate impregnation ratio of 1:3. Experimental design followed Box-Behnken approach. The increase in iodine (757.30 mg/g) and methylene blue number (111.00 mg/g) are indicative of a highly porous biocarbon material that reflects its excellent adsorption capability. Suitability of the biocarbon material for application in charcoal-based cosmetic formulation mixture was supported through proximate, texture, and color analysis. Overall material characteristics are beneficial for effective adsorbent and exfoliant functions in cleansing, detoxifying, and scrubbing.

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