Dizajn i proizvodnja milireaktorskog sustava sa senzorskom prevlakom

master's thesis

• Title (english): Design and production of a sensor-coated millireactor system
• Author: Marijan-Pere Marković
• Mentor: Domagoj Vrsaljko (mentor)
• Committee member: Domagoj Vrsaljko (predsjednik povjerenstva)
• Committee member: Petar Kassal (član povjerenstva)
• Committee member: Krunoslav Žižek (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2021-07-01, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Cilj ovoga rada bio je dizajnirati jednostavni milireaktorski sustav i nanijeti senzorski film na površinu kanala. Senzorski film je pripremljen sol-gel metodom. U radu je ispitano može li se dobiti funkcionalan pH senzorski film koji će u kanalima milireaktora davati jasan odziv u realnom vremenu. Za dobivanje senzorskog filma korišteni su tetraetoksisilan, TEOS i feniltrimetoksisilan, FTMS kao prekursori za sol-gel metodu, etanol kao otapalo, metil crveno kao pH indikator te HCl kao katalizator reakcije. Dobiveni senzorski filmovi prvo su ispitani na pločicama, a zatim primijenjeni u kanalima milireaktora. Ispitivanjem filmova na pločicama zaključeno je da prevelika debljina sloja dovodi do pucanja filmova, što uzrokuje izlaženje indikatora te odvajanje filma od površine. Stoga su tanji filmovi dobiveni na nekoliko načina. Prvi način bio je smanjenje vremena pripreme smjese kako bi se osigurala manja viskoznost prilikom nanošenja, a drugi je bio razrjeđenje smjese povećanjem količine otapala, etanola. Analizom funkcionalnosti pločica utvrđeno je da prvi način, bez dodatka više etanola, daje najbolje senzorske filmove, stoga je taj film odabran za primjenu u kanalima milireaktora. Ispitivanje je u kanalima milireaktora provedeno pomoću peristaltičke pumpe. Izmjenjivane su kiselina i lužina uz ispiranje destiliranom vodom između ciklusa. U vremenskom intervalu od 5 minuta dolazi do promjene boje senzora u ovisnosti o pH-vrijednosti otopine. Promjena boje je jako teško uočljiva golim okom pa je potreban RGB softver za analizu boje. Može se zaključiti da je potrebno dalje optimirati dobivene senzorske filmove kako bi davali jasniji odziv u realnom vremenu.

Abstract (english)

The aim of this work was to design a simple millireactor system and to apply a sensor film to the surface of the channel. The sensor film was prepared by the sol-gel method. In this work it was studied whether a functional pH sensor film can be obtained which will give a clear response in real time inside the channels of the millireactor. To obtain the sensor film, tetraethoxysilane, TEOS, and phenyltrimethoxysilane, FTMS, were used as precursors for the sol-gel method, ethanol as the solvent, methyl red as the pH indicator and HCl as the reaction catalyst. The resulting sensor films were first tested on plates and then applied in milireactor channels. Examination of the plates on the tiles concluded that the excessive thickness of the layer leads to cracking of the films, which causes the leaking of the indicator and the film itself to separate from the surface. Therefore, thinner films were obtained in several methods. The first method was to reduce the preparation time of the mixture to ensure a lower viscosity during application, and the second was to dilute the mixture by increasing the amount of solvent, ethanol. By analyzing the functionality of the plates, it was found that the first method, without the addition of more ethanol, gives the best sensor films and therefore this film was selected for application in milireactor channels. The tests in the milireactor channels were performed with a peristaltic pump, by the cyclic exchange of acid and alkali using rinsing with distilled water in between the cycles. Within a time interval of 5 minutes the results show a change in the color of the sensor depending on the pH value of the solution. Change of color is very difficult to see with the naked eye and requires RGB color analysis software. It can be concluded that it is necessary to further optimize the obtained sensor films in order to give a clearer response in real time.

• Keywords: aditivna proizvodnja; sol-gel metoda; senzorski filmovi; pH indikatori; milireaktori
• Keywords (english): additive manufacturing; sol-gel method; sensor films; pH indicators; millireactors
• Language: croatian
• URN:NBN: urn:nbn:hr:149:615205
• Project: Number: KK.01.1.1.04.0006; Title: Otpad i Sunce u službi fotokatalitičke razgradnje mikroonečišćivala u vodama; Acronym: OS-Mi; Leader: Ivana Grčić; Jurisdiction: Croatia; Funder: MZO; Funding stream: Nema
• Study programme: Title: Materials Science and Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2023-04-06 12:26:04