Characterization of the Chemical Finishing Process with a Cold Acetone Bath of ABS Parts Fabricated by FFF

2021 ◽  
pp. 77-89
Author(s):  
Leonardo Riva ◽  
Antonio Fiorentino ◽  
Elisabetta Ceretti
Keyword(s):  
Finishing Process ◽  
Cold Acetone

scholarly journals Investigation of a plain ball burnishing process on differently machined Aluminium EN AW 2007 surfaces

2018 ◽  
Vol 190 ◽  
pp. 11005 ◽  
Author(s):  
Marco Posdzich ◽  
Rico Stöckmann ◽  
Florian Morczinek ◽  
Matthias Putz
Keyword(s):  
Surface Roughness ◽  
Process Parameters ◽  
Process Development ◽  
Fem Simulation ◽  
Initial Surface ◽  
Shape Deviation ◽  
Finishing Process ◽  
Path Distance ◽  
Burnishing Process

Burnishing is an effective chipless finishing process for improving workpiece properties: hardness, vibration resistance and surface quality. The application of this technology is limited to rotationally symmetrical structures of deformable metals. Because of the multiaxial characteristics, the transfer of this force controlled technology on to prismatic shapes requires a comprehensive process development. The main purpose of this paper is the characterization of a plain burnishing process on aluminium EN AW 2007 with a linear moved, spherical diamond tool. The method of design of experiments was used to investigate the influence of different machined surfaces in conjunction with process parameters: burnishing force, burnishing direction, path distance and burnishing speed. FEM simulation was utilized for strain and stress analysis. The experiments show, that unlike the process parameters the initial surface roughness as 3rd order shape deviation does not have a significant influence on the finished surface. Furthermore a completely new surface is created by the process, with properties independent from the initial surface roughness.

Purification and Characterization of a Protease Inhibitor with Anticancer Potential from Bacillus endophyticus JUPR15

2019 ◽  
Vol 15 (1) ◽  
pp. 74-82 ◽  
Author(s):  
Prerana Venkatachalam ◽  
Varalakshmi Kilingar Nadumane
Keyword(s):  
Protease Inhibitors ◽  
Inhibitory Activity ◽  
Main Function ◽  
Anticancer Compounds ◽  
Sds Page ◽  
Bacillus Endophyticus ◽  
Cold Acetone ◽  
Characterization Studies

Introduction:Introduction: Protease Inhibitors (PIs) constitute a group of proteins widely distributed among all organisms and their main function includes their ability to inhibit the proteolytic activity. PIs represent an important role in the regulation of various cellular physiological and biological processes, including cell cycle, cell death, differentiation and immune response.Material and Methods:Hence, in our search for novel anticancer compounds, we isolated microorganisms from various environmental sources and screened them for the production of protease inhibitors. Promising isolates were further checked for their protease inhibitory activity by their ability to inhibit the activity of trypsin and chymotrypsin, which were measured spectrophotometrically.Results:The isolate identified as Bacillus endophyticus JUPR15 was found to be promising with higher inhibitory activity than the other isolates. The inhibitor was purified by cold acetone precipitation and column chromatography and further subjected to characterization studies by performing 12 % SDS-PAGE to determine the molecular weight and gelatin-PAGE assay to confirm its inhibitory activity.Conclusion:The isolate exhibited promising anticancer activity on in-vitro Hela and HepG2 cancer cell lines, showing its application potentials.

Characterization of chemical surface finishing with cold acetone vapours on ABS parts fabricated by FDM

2019 ◽  
Vol 13 (3-4) ◽  
pp. 437-447 ◽  
Author(s):  
Alessandro Colpani ◽  
Antonio Fiorentino ◽  
Elisabetta Ceretti
Keyword(s):  
Surface Finishing ◽  
Chemical Surface ◽  
Cold Acetone

scholarly journals Using Waste from Food Cans as Electrode in Electrocoagulation for Wastewater Treatment

2018 ◽  
Vol 7 (4.38) ◽  
pp. 1372
Author(s):  
Chanchanok Soonsorn ◽  
Kulyakorn Khuanmar ◽  
Surapol Padungthon ◽  
Panomchai Weerayutsil
Keyword(s):  
Wastewater Treatment ◽  
Treatment Efficiency ◽  
Sem Images ◽  
The Real ◽  
Finishing Process ◽  
Real Wastewater ◽  
Low Efficiency ◽  
Aluminium Sheets ◽  
Textile Factory

Wastes from soda and milk cans which contain metals can be used as electrode in Electrocoagulation (EC) technique. The study used wastewater from dyeing and finishing process of textile factory. Both the electrodes made from soda cans and milk cans were compared to the conventional electrodes made from aluminium sheet. Characterization of aluminium (Al) element in electrode showed 67.28% in aluminium sheets, 4.99% in soda cans, and 0% in milk cans. Nevertheless, only milk cans contain iron (Fe) and tin (Sn) at 45.87% and 23.87%, respectively. Based on treatment efficiency in COD removal from the real wastewater, it turned out that the highest efficiency was from aluminium sheets, at 83.57%, whereas soda-can electrodes and milk-can electrodes were 80.71% and 71.14%, respectively. This could result from the fact that soda-can electrodes contain high percentage of aluminium while milk-can electrodes have no aluminium, leading to its low efficiency. Although Fe in milk can function as electrodes, the efficiency cannot be compared to electrodes made from soda cans. Therefore, soda cans make an efficient material for electrodes because of its high percentage of aluminium. Analysis of SEM images demonstrated compactly agglomerated sludge from aluminium electrodes and soda-can electrodes. The image from testing milk can material demonstrated in contrast loosely agglomerated sludge. It can be concluded that the use of electrodes containing aluminium produces relatively more effective sedimentation.       

scholarly journals Characterization of Used Lubricant Oil in a Latin-American Medium-Size City and Analysis of Options for Its Regeneration

Recycling ◽  
2021 ◽  
Vol 6 (1) ◽  
pp. 10
Author(s):  
Carlos Sánchez-Alvarracín ◽  
Jessica Criollo-Bravo ◽  
Daniela Albuja-Arias ◽  
Fernando García-Ávila ◽  
M. Raúl Pelaez-Samaniego
Keyword(s):  
United Arab Emirates ◽  
Latin American ◽  
Medium Size ◽  
Used Oil ◽  
Lubricant Oil ◽  
Metal Contents ◽  
Finishing Process ◽  
Filtration Step ◽  
American Cities

Petroleum-derived products, such as lubricant oils, are non-renewable resources that, after use, must be collected and processed properly to avoid negative environmental impacts. A circular economy of used oils requires the re-refining and reuse of the same. Similar to most countries in Latin America, the management of used oils in Ecuador is still incipient and few cities collect and treat this material properly. In Cuenca, the ETAPA company collects ~1344 t/year of used oils, which are subjected to pretreatment operations prior to their use as fuel in a cement factory. However, combustion generates polluting gases and disallows the adding of value to the used oils. The lack of studies on the characterization and methods utilized for recovering used oils under the conditions found in medium-size Latin-American cities (e.g., Cuenca), alongside a lack of government policies, have hindered the adoption of re-refining operations. The objective of this work is to characterize the used lubricant oils in Cuenca, to compare them with the properties of used oils from other countries, and to suggest some re-refining technologies for oils with similar properties. Used oil samples were collected from mechanic shops and car-lubricating shops for characterization. Its physicochemical properties and metal contents are comparable to the used oils in other countries globally. Specifically, the flash point, kinematic viscosity, TBN, and concentrations of Zn, Cd, and Mg are similar to the properties of used oils in Iraq, Egypt, and the United Arab Emirates. Based on these results, the best re-refining option for used oils in Cuenca is extraction with solvents in which sedimentation and dehydration (already conducted in Cuenca) is followed by a solvent reaction process, a vacuum distillation process, a finishing process with bentonite, and a final filtration step.

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