scholarly journals Synthesis and characterization of biomorphic CeO2 obtained by using egg shell membrane as template

2014 ◽  
Vol 8 (2) ◽  
pp. 81-85 ◽  
Author(s):  
Marija Prekajski ◽  
Biljana Babic ◽  
Dusan Bucevac ◽  
Jelena Pantic ◽  
Jelena Gulicovski ◽  
...  
Keyword(s):  
Water Solution ◽  
New Technology ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Shell Membrane ◽  
Bet Method ◽  
Egg Shell Membrane ◽  
Egg Shell ◽  
Chicken Eggs

A new technology based on bio-templating approach was proposed in this paper. Egg-shell membrane (ESM) has been employed as a natural biotemplate. Fibrous oxide ceramics was prepared by wet impregnation of biological template with water solution of cerium nitrate. The template was derived from membranes of fresh chicken eggs. Repeated impregnation, pyrolysis and final calcination in the range of 600 to 1200?C in air resulted in template burnout and consolidation of the oxide layers. At low temperatures, the obtained products had structure which corresponded to the negative replication of biological templates. Unique bio-morphic CeO2 microstructures with interwoven networks were synthesized and characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD), whereas low-temperature nitrogen adsorption (BET) method was used in order to characterize porous properties.

Synthesis and Characterization of Molecular Sieve SBA-15 and Catalysts Co/SBA-15 and Ru/Co/SBA-15

2014 ◽  
Vol 798-799 ◽  
pp. 100-105 ◽  
Author(s):  
Jocielys Jovelino Rodrigues ◽  
Liliane Andrade Lima ◽  
Gustavo Medeiros de Paula ◽  
Meiry Glaúcia Freire Rodrigues
Keyword(s):  
Molecular Sieve ◽  
High Surface ◽  
Nitrogen Adsorption ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Areas ◽  
Bet Method ◽  
Superficial Area

A series of mesoporous materials have been synthesized in an acid medium, with various structures, such as SBA-15. These materials have many properties which make them potential catalysts. Among these we highlight their high surface areas and pore walls relatively thick, resulting in a greater hydrothermal stability. This work aims at the synthesis and characterization of molecular sieve SBA-15 with molar composition: 1.0 TEOS: 0.017 P123: 5.7 HCl: 193 H2O and Co/SBA-15 and catalysts for the reaction of Ru/Co/SBA-15 Fischer Tropsch process. The materials were characterized by the techniques of X-ray diffraction (XRD), chemical analysis by X-ray spectrometry, energy dispersive (EDX) and Nitrogen adsorption (BET method). X-ray diffraction showed that the calcined cobalt catalyst did not modify the structure of SBA-15 and that Co was present under the form of Co3O4 in the catalyst. The addition of cobalt in the SBA-15 decreased the specific superficial area of the molecular sieve.

scholarly journals In vitro analysis of particle penetration of smokeless tobacco forms using egg shell membrane as a substrate

2015 ◽  
Vol 11 (1) ◽  
pp. 204
Author(s):  
Nithya Jagannathan ◽  
AbilashaRamasubra manian ◽  
Pratibha Ramani ◽  
Priya Premkumar ◽  
Anuja Natesan ◽  
...  
Keyword(s):  
Smokeless Tobacco ◽  
Particle Penetration ◽  
Shell Membrane ◽  
Egg Shell Membrane ◽  
Egg Shell ◽  
Vitro Analysis ◽  
In Vitro Analysis

scholarly journals PENGARUH APLIKASI GEL EKSTRAK MEMBRAN KULIT TELUR BEBEK 10% TERHADAP KEPADATAN SERABUT KOLAGEN PADA PROSES PENYEMBUHAN LUKA GINGIVA

2017 ◽  
Vol 4 (1) ◽  
pp. 13
Author(s):  
Agung Ikaputri Mulatpeni Novitasari ◽  
Recita Indraswary ◽  
Rosa Pratiwi
Keyword(s):  
Wound Healing ◽  
Rattus Norvegicus ◽  
Collagen Fiber ◽  
Positive Control ◽  
Cellular Migration ◽  
Shell Membrane ◽  
Egg Shell Membrane ◽  
Duck Egg ◽  
Egg Shell ◽  
Experimental Group

Background: Several processes in a teeth treatment often inflict wound ingingiva. Collagen is the key component of the wound healing. The collagen roles in advancing wound healing particularly, triggering the synthesis to induces collagen and cellular migration, and also inducing clotting cascades. Wound treatment using natural product is potential in accelerating wound healing, in particular duck egg membrane which contains collagen, glucosamine, and hyaluronic acid. This study aims to find out the influence of gel extract application of duck egg shell membrane 10 % towards collagen solidity on gingiva wound recovery process (study of Rattus norvegicus).Method: The subjects of the study consist of 20 male Rattus norvegicus aged 2-3 months which were given wound on labial gingiva of the maxillary central incisors with punch biopsy. The samples were divided into 2 groups, they were positive control group (Aloclair Gel®) and experimental group (gel extract of duck egg shell membrane 10%), each of them was treated topically twice a day for one minute.The assessment of collagen fiber was done by giving score over the collagen fiber solidity of the histological tissue through 6 points of view. The observer done by two person (blind interpretation) score of collagen fiber solidity.Result: The analysis result showed that there was a significant difference on collagen fiber solidity (p>0,05) between positive control groups and experimental group on the 3rd, 7th, and 14th day.Conclusion: This study concludes that the application of topical gel extract of duck egg shell membrane 10% affects the improvement of collagen fiber solidity on the process of healing gingiva wound on Rattus norvegicus

scholarly journals Síntese, caracterização e estabilidade de nanopartículas de magnetita

2021 ◽  
Vol 3 (4) ◽  
pp. 2738-2749
Author(s):  
Monise Cristina Ribeiro Casanova Coltro ◽  
Warde Antonieta da Fonseca-Zang ◽  
Joachim Werner Zang ◽  
Danilo César Silva e Sousa
Keyword(s):  
New Technology ◽  
X Ray Diffraction ◽  
Synthesis Of Nanoparticles ◽  
Research Areas ◽  
Magnetite Fe3o4 ◽  
Mineral Substance ◽  
Abundant Element ◽  
The Stability ◽  
Average Size

Nanopartículas de ferro são muito utilizadas em diversas áreas de pesquisa. O elemento químico ferro (Fe), sendo o quarto elemento mais abundante na crosta terrestre, e a substância mineral magnetita, com propriedade magnética, apresentam aplicações nas áreas industrial, ambiental, biomédica e de novas tecnologias. Este trabalho apresenta processo de síntese de nanopartículas partindo-se de sais precursores, bem como a caracterização dos produtos e as rotas para estabilizá-los. Os sais químicos precursores utilizados foram o cloreto férrico (FeCl3) e o sulfato ferroso (FeSO4) na proporção de 2:1, sob agitação por ultrassom e pH ácido. Para formação do precipitado de nanopartículas usou-se solução aquosa de hidróxido de sódio (NaOH) de pH 12. A difratometria de raio-X, mostra a presença de magnetita (Fe3O4) indicada pelos picos característicos de difração em graus 2Ө = 18° (largo), 31° (fino), 36° (bem definido), 43,4°, 45°, 53,6°, 57,7°, 63,3°. A microscopia eletrônica de transmissão mostra a morfologia dos produtos da síntese. Fatores que influenciam a estabilidade das partículas são agitação, o ajuste de pH, condições de secagem. O tamanho médio das nanopartículas de magnetitas é de aproximadamente 15 nm.   Iron nanoparticles are widely used in several research areas. The chemical element iron (Fe), being the fourth most abundant element in the earth's crust, and the mineral substance magnetite, with magnetic properties, have applications in industrial, environmental, biomedical, and new technology areas. This work presents the process of synthesis of nanoparticles starting from precursor salts, as well as the characterization of the products and the routes to stabilize them. The precursor chemical salts were ferric chloride (FeCl3) and ferrous sulfate (FeSO4) in a 2:1 ratio, under ultrasound agitation and acidic pH. For the nanoparticles growth was applied aqueous solution of sodium hydroxide (NaOH) at pH 12. X-ray diffraction shows the presence of magnetite (Fe3O4) indicated by characteristic diffraction peaks in degrees 2Ө = 18° (wide), 31° (fine), 36° (well defined), 43.4°, 45°, 53.6°, 57.7°, 63.3°. Scanning electron microscopy shows the morphology of the synthesis products. Factors that influence the stability of the particles are agitation, the pH adjustment, and the conditions of drying. The average size of the magnetite nanoparticles is approximately 15 nm.

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