scholarly journals CARACTERIZAÇÃO TECNOLÓGICA DAS ARGAMASSAS HISTÓRICAS DO MUSEU CASA RUI BARBOSA

2016 ◽  
Author(s):  
Daniele Pereira da Silva Dalto ◽  
Luanna Cavalcanti Rebecchi de Moura ◽  
Roberto Carlos da Conceição Ribeiro
Keyword(s):  
Particle Size ◽  
Rio De Janeiro ◽  
Characteristic Curve ◽  
Diffraction Method ◽  
Carbonaceous Material ◽  
Thermal Characterization ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
X Rays

ResumoO edifício que abriga atualmente o Museu foi residência do jurista, escritor e político brasileiro Rui Barbosa de Oliveira e está localizado no bairro de Botafogo na cidade do Rio de Janeiro tombado pelo IPHAN. A construção data de 1850 e seu valor não se delimita apenas por ter abrigado Ruy Barbosa, mas também por ter sido cenário de grandes eventos sociais e políticos da época. O objetivo do presente trabalho é a caracterização de argamassas históricas do Museu Casa Rui Barbosa, por meio de análises petrográficas, mineralógicas, químicas, físicas, térmicas, granulométricas e reconstituição do traço usando método Teutonico, o mais difundido para argamassas históricas à base de cal. Todas as análises apresentaram resultados extremamente consistentes quanto à composição da argamassa. Por diferentes técnicas foi possível constatar que a maior parte das amostras analisadas é composta por areia (quartzo) e cal (calcita). As amostras também apresentaram outros minerais, em menor quantidade, como caulinita, microclina (feldspato) e muscovita (filossilicato). Foi possível ainda visualizar na microscopia óptica os minerais detectados pelo método de difração de raios-X com bastante definição de imagem. Quanto aos testes físicos, as argamassas apresentaram massa específica aparente seca 1,6 kg.m-³ e saturada de 1,9kg.m-³, enquanto a média de porosidade de 25% e absorção de água de 15%. Durante a caracterização térmica todas as argamassas apresentaram perfil de degradação similar e as maiores perdas de massa aconteceram em temperaturas acima de 600ºC, na faixa de decomposição do material carbonáceo (cerca de 8% em média). Além disso, a análise granulométrica apresentou curva característica de material rico em areia, corroborando com todas as outras análises. Sendo que, grande parte dessas partículas, está entre 0,6 e 2,0mm, sendo, portanto, areia grossa. A maioria das amostras apresentou a relação areia:cal de 4:1, mas também havia amostras com 1:1, 2:1 e 3:1. Mostrando assim que a relação areia:cal não é constante em todo o Museu, independente da fachada. Palavras Chave: argamassas históricas, caracterização, Museu Casa de Rui Barbosa  AbstractTECNOLOGIC CHARACTERIZATION OF HISTORICAL MORTARS FROM CASA RUI BARBOSA MUSEUM. The building that currently houses the Museum was the residence of a lawyer, a Brazilian writer and politician Ruy Barbosa de Oliveira and is located in Botafogo in the city of Rio de Janeiro. The Museum was built 1850 and its value not only defines for having sheltered Ruy Barbosa, but also for having been the scene of major social and political events of the time. The aim of this work is the characterization of historical mortars Museum Casa Rui Barbosa, using petrographic, mineralogical, chemical, physical, thermal, particle size analysis and reconstitution of the trace with Teutonico method, the most common for lime based mortar. All analyzes showed very consistent results regarding the composition of the mortar. For various techniques, the samples are composed of sand (quartz) and lime (calcite). The samples also showed other minerals, in smaller quantities, such as kaolinite, microcline (feldspar) and muscovite (phyllosilicate). The minerals detected by diffraction method of X-rays was possible observed by microscopy analysis. During the physical testing, the mortars showed apparent density 1.6 kg.m-³for saturated and 1.9 kg.m-³ for dry while the average porosity of 25% and 15% water absorption. The thermal characterization showed a similar degradation curve for all mortars and higher mass losses occurred at temperatures above 600°C, in the range of decomposition of the carbonaceous material (about 8% on average). Furthermore, the particle size analysis showed characteristic curve rich material sand, confirming others analyzes. Most of these particles is between 0.6 and 2.0mm, and therefore, sand (high diameter). Most samples showed the ratio sand:lime 3:1, but there were samples with 1:1, 2:1 and 4:1. It can be concluded through those ratios sand: lime is not constant throughout the museum, regardless of the façade.Keywords: historical mortar, characterization, Casa Rui Barbosa Museum.

scholarly journals PREPARATION AND CHARACTERIZATION OF ANTI-ACNE ETHOSOMES USING COLD AND THIN-LAYER HYDRATION METHODS

2018 ◽  
Vol 10 (1) ◽  
pp. 338
Author(s):  
Rachmawati Ramadhana Mustofa ◽  
Iskandarsyah .
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Thin Layer ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Multilamellar Vesicles ◽  
Zeta Potentials ◽  
Small Unilamellar Vesicles

Objective: This study aimed to prepare and characterize anti-acne ethosomes using the cold- and thin-layer hydration methods.Methods: A sonication step was included during ethosome preparation to improve the quality of the cold method. Azelaic acid, Phospholipon 90G,ethanol, propylene glycol, and phosphate buffer (pH 7.4) were used in the procedures. Prepared ethosomal suspensions were characterized usingtransmission electron microscopy, particle-size analysis, and spectrophotometry.Results: Ethosomes prepared using the thin-layer hydration method (F1) had small unilamellar vesicles, while those prepared using the cold methodwith 15-min sonication (F4) showed spherical, elliptical, unilamellar, and multilamellar vesicles. F1 ethosomes had a Dmean volume of 648.57±231.26,whereas those prepared using the cold method with 5- (F2), 10- (F3), and 15-min (F4) sonication had Dmean volumes of 2734.04±231.49 nm,948.90±394.52 nm, and 931.69±471.84 nm, respectively. Polydispersity indices of F2, F3, and F4 ethosomes were 0.74±0.21, 0.86±0.05, and 0.91±0.03,respectively, with a poor particle-size distribution, compared to that of F1 (0.39±0.01). Zeta potentials of F1–F4 ethosomes were −38.27±1.72 mV,−23.53±1.04 mV, −31.4±1.04 mV, and −34.3±1.61 mV, respectively. Entrapment efficiencies of F1–F4 ethosomes were 90.71±0.11%, 53.84±3.16%,72.56±0.28%, and 75.11±1.42%, respectively.Conclusion: Anti-acne ethosomes produced using the thin-layer hydration method had superior properties than those produced using the coldmethod with 15-min sonication.

Synthesis and Characterization of Nanocrystalline Hydroxyapatite Powder

2015 ◽  
Vol 1087 ◽  
pp. 142-146 ◽  
Author(s):  
Rosli Asmawi ◽  
Mohd Halim Irwan Ibrahim ◽  
Azriszul Mohd Amin ◽  
Najwa Mustapha ◽  
Iis Sopyan
Keyword(s):  
Particle Size ◽  
Calcium Phosphate ◽  
High Surface ◽  
High Surface Area ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Heating Process ◽  
X Ray Diffraction ◽  
Nanocrystalline Hydroxyapatite

Nanocrystalline hydroxyapatite (HA) powder was synthesized by a simple heating process involving simple chemical reaction. The characterization of the produced powder showed that the powder is nanosize with particle in the range of 30-70 mm in diameter and almost evenly spherical in shape. The powder also has a high surface area of 43.16 m2/g. Field Emission Scanning Electron Microscopy (FESEM) observation showed the crystallite and particle size become bigger with an increment of calcination temperature, indicating increasing of crystallinity.. FESEM observation showed the particle size become bigger with an increment of calcinations temperature. It is in agreement with the crystallite size analysis, obtained by Scherer’s formula and particle size analysis, measured by nanoSizer. X-ray Diffraction (XRD) and Fourier Transform Infra Red Spectroscopy (FTIR) analyses exhibited the same result, where HA phase was clearly observed at at various temperatures up to 600 ̊C. However, at temperature more than 600 ̊C, Tri calcium phosphate (TCP) phase appeared suppressing the HA phase, producing biphasic calcium phosphate.

Characterization and Granulometric Correction Soil for the Production of Soil-Cement Blocks for Two Method, Particle Size and X-Ray Florescence to be Inserted in Phase Change Materials (PCMS)

2014 ◽  
Vol 798-799 ◽  
pp. 355-359 ◽  
Author(s):  
Valter Bezerra Dantas ◽  
U.U. Gomes ◽  
A.B. Vital ◽  
G.S. Marinho ◽  
Ariadne de Souza Silva
Keyword(s):  
Particle Size ◽  
Phase Change Materials ◽  
Clay Content ◽  
Particle Size Analysis ◽  
Liquid Limit ◽  
Size Analysis ◽  
X Ray ◽  
Soil Cement

This paper presents the results of tests for characterization of soil samples collected in Mossoró-RN, UFERSA-RN Campus (5 ° 12'34 .68 "South latitude, 37 ° 19 '5.74 "west longitude), for the purpose of producing soil-cement for the manufacture of pressed blocks. Objective of improving the quality of soil-cement, and provide conditions for the use of the soil making it ideal for the production of soil-cement block. Tests of compaction, particle size analysis, plastic limit, liquid limit and correct particle size, X-ray fluorescence and morphology by scanning electron microscopy (SEM). It was concluded that the soil needs correction particle size, due to the high clay content. The method combined grading, sieving, sedimentation and blooming X-ray as the fastest and most accurate in correcting soil particle size.

Inhalation of nail dust from onychomycotic toenails. Part I. Characterization of particles. 1984

1992 ◽  
Vol 82 (2) ◽  
pp. 111-115 ◽  
Author(s):  
C Abramson ◽  
J Wilton
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Particle Size ◽  
Total Mass ◽  
Particle Size Analysis ◽  
Dust Particles ◽  
Size Analysis ◽  
Scanning Electron

Nail dust particles were analyzed by scanning electron microscopy for size and topography. The percentage of "fines" that could be inhaled and deposited in the alveoli and bronchioles were determined by quantitative particle size analysis. Distribution representing the largest total mass was graphed between 1 and 2 microns. The authors found that 86% of nail dust would reach the bronchioles and alveoli, and 31% could be expected to deposit in these areas.

Characterization of Natural Slip Materials Geologically Found in the North of the State of Rio de Janeiro, Brazil

2014 ◽  
Vol 798-799 ◽  
pp. 33-38
Author(s):  
Zélia Maria Peixoto Chrispim ◽  
Maria da Gloria Alves ◽  
Luciana Lezira Pereira de Almeida ◽  
Jonas Alexandre ◽  
Afonso Rangel Garcez de Azevedo ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Rio De Janeiro ◽  
Ceramic Industry ◽  
Particle Size Analysis ◽  
The State ◽  
Size Analysis ◽  
X Ray ◽  
Geological Materials ◽  
The North

Slip is a semifluid clayey type of material used in the ceramic industry for coating earthware products, such as bricks and tiles, thus providing distinct surface colors or patterns. In the present work a characterization was conducted to identify the mineralogical as well the chemical and physical properties of geological materials existing in the slip used by industries in the north region of the state of Rio de Janeiro, Brazil. The basic natural materials composing a slip, namely clay and kaolin, are responsible for changes not only the slip plasticity but also in its viscosity and adhesion to the surface of the ceramic piece. The slip characterization was performed in terms of particle size analysis, Atterberg limits and actual grain density. The chemical composition was obtained by X-ray fluorescence and the thermal properties by differential thermal analysis. The results indicated that marked differences exist between slip from distinct origins. A few slip samples failed to present the required properties.

Valuation and Characterization of Actinidin Treatment to Pork

2012 ◽  
Vol 554-556 ◽  
pp. 1258-1261
Author(s):  
Yan Chen ◽  
Qian Zhang ◽  
Xiao Yan Lin ◽  
Xi Yan Liao
Keyword(s):  
Particle Size ◽  
Shear Force ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Microstructure Characteristics ◽  
Soluble Collagen ◽  
Fragmentation Index ◽  
Collagen Protein

The paper studied the effect of kiwifruit protease on tenderization of pork and related characterization has been made, the result indicates that pork marinate with kiwifruit protease may lead the degradation of collagen protein and the change of the myofibril fragmentation index (MFI), particle size, viscosity, Warner-Bratzler shear force, area force versus time (Area F-T) as well as microstructure characteristics. Because of the inconvenience of characterization of MFI and soluble collagen, viscosity, particle size analysis, shear force and area F-T can fast and accurate characteristic the changes of tenderizer of pork after marination with kiwifruit protease.

scholarly journals Preparation and Characterization of Betel Leaves (Piper betle Linn) Extract Nanoparticle with Ionic Gelation Method

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Dwi Saryanti ◽  
Dian Nugraheni ◽  
Nisa Sindi Astuti
Keyword(s):  
Particle Size ◽  
Zeta Potential ◽  
Leaf Extract ◽  
Particle Morphology ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Piper Betle ◽  
Ionic Gelation ◽  
Betel Leaf

Nanoparticles are used in drug delivery which can increase mass transfer so increase the absorption and effectiveness of the drug. Therefore, its prospect to improve antibacterial and antioxidants activities of betel leaves. The research aimed to preparation and characterization of betel leaf extract using ionic gelation technique. The formulation of nanoparticles from betel leaf extract with ionic gelation method using alginate and CaCl2 with a ratio of 2.5: 1. The characterization of the nanoparticles includes particle size analysis, zeta potential, particle morphology and determination of flavonoid content. Particle size analysis demonstrated that the betel leaf extract nanoparticles had a particle size of 243,03 ± 1,48 nm, zeta potential of -23,0 ± 0,35 mV and morphology of particle showed that a flat shape. The betle leaf exctract nanoparticle positively contained flavonoid with Rf 0.7 equivalent to quercetin. The betel leaf extract can be made nanoparticles with ionic gelation method using alginate and CaCl2.

Preparation, Characterization of Co3O4 Nano-Particles and its Catalytic Effect on the Combustion of Fuel Rich Propellants

2012 ◽  
Vol 560-561 ◽  
pp. 284-288 ◽  
Author(s):  
Wei Qiang Pang ◽  
Xiao Bing Shi ◽  
Yang Li
Keyword(s):  
Particle Size ◽  
Catalytic Effect ◽  
Solid Phase ◽  
Particle Size Analysis ◽  
Nano Particles ◽  
Size Analysis ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Wide Size Distribution

The mono-dispersed Co3O4 nano-particles were prepared by means of solid phase synthetical method. The particle size, specific surface area, crystal structure and morphology of the samples were characterized by laser particle size analysis, x-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The catalytic effects of nano-particles on the combustion of fuel rich propellant were investigated. The results show that the Co3O4 nano-particles prepared are uniform and with relatively wide size distribution curve. The catalytic effect of Co3O4 nano-particles on the fuel rich propellant is stronger than those of micro-sized Co3O4 particles and CuO nano-particles.

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