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Karlstad University

1. Almén, Anton. Importance of atomic force microscopy settings for measuring the diameter of carbon nanotubes.

Degree: Engineering and Physics (from 2013), 2019, Karlstad University

Carbon nanotubes (CNTs) have gathered a lot of interest because of their extraordinary mechanical, electrical and thermal properties and have potential applications in a wide variety of areas such as material-reinforcement and nano-electronics. The properties of nanotubes are dependent on their diameter and methods for determining this using atomic force microscopy (AFM) in tapping mode assume that the measured height of the tubes represent the real diameter. Based on early, faulty calculations, the forces in tapping mode were assumed to be much lower than in contact mode, however it was later shown that forces in tapping mode can at point of impact rival the forces present in contact mode. This means that there is a potential risk of tube deformation during tapping mode measurements, resulting in incorrectly determined diameters. This work studies CNTs deposited on a silicon-substrate to analyze the effect of three common AFM settings (tapping frequency, free oscillation amplitude and setpoint) to determine their effect on measured CNT diameters and recommendations for choosing settings are given.

Kolnanorör har skapat mycket intresse på grund av sina extraordinära mekaniska, elektriska och termiska egenskaper och har lovande tillämpningar inom en mängd olika områden så som materialförstärkning och nanoelektronik. Kolnanorörens egenskaper påverkas kraftigt av deras diameter och de metoder som använder sig av atomkraftsmikroskopi(AFM) för att mäta diametern hos rören antar att den höjd-data man får fram är ett bra mått på den verkliga diametern hos rören. Baserat på tidiga, felaktiga beräkningar, antog man att kraften i ’tapping mode’ skulle vara mycket lägre än i ’contact mode’ vilket skulle leda till att man inte deformerar ytan man undersöker. Senare forskning visade att kraften mellan spets och prov kan vara lika stor eller rentutav större i tapping mode än i contact mode under det ögonblick då spetsen slår ner i provytan. Det medför att det finns en potentiell risk för att man deformerar kolnanorören när man mäter på dom vilket skulle resultera i att man får felaktiga värden på deras diametrar. Under det här projektet har kolnanorör som placerats på ett kisel-substrat undersökts för att analysera hur tre vanliga inställningar hos AFMet påverkar de erhållna värdena för diametern hos kolnanorören. De tre inställningarna som testats är svängnings-frekvensen, svängnings-amplituden i luft och börvärdet hos svängnings-amplituden.

Subjects/Keywords: Carbon nanotubes (CNTs); Atomic force microscopy (AFM); diameter; height; tapping; frequency; phase; amplitude; setpoint; Kolnanorör; Atomkraftsmikroskopi (AFM); diameter; höjd; svängning; frekvens; fas; amplitud; börvärde; Nano Technology; Nanoteknik

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Almén, A. (2019). Importance of atomic force microscopy settings for measuring the diameter of carbon nanotubes. (Thesis). Karlstad University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-74745

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Almén, Anton. “Importance of atomic force microscopy settings for measuring the diameter of carbon nanotubes.” 2019. Thesis, Karlstad University. Accessed January 26, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-74745.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Almén, Anton. “Importance of atomic force microscopy settings for measuring the diameter of carbon nanotubes.” 2019. Web. 26 Jan 2020.

Vancouver:

Almén A. Importance of atomic force microscopy settings for measuring the diameter of carbon nanotubes. [Internet] [Thesis]. Karlstad University; 2019. [cited 2020 Jan 26]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-74745.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Almén A. Importance of atomic force microscopy settings for measuring the diameter of carbon nanotubes. [Thesis]. Karlstad University; 2019. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-74745

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Universitat de Girona

2. Dorf, Tomasz. Contributions to ultrasonic micro-moulding process of high performance polymers.

Degree: Departament d'Enginyeria Mecànica i de la Construcció Industrial, 2019, Universitat de Girona

Els materials polimèrics de altes prestacions són considerats apropiats per desenvolupar diferents aplicacions, en especial en el cas dels implants o próstesis mediques. El procés de injecció o en el seu defecte la micro-injecció ve essent utilitzada per la fabricació en grans volums, però resulta inapropiat per la fabricació de petites sèries pel seu cost econòmic. Recentment els avanços realitzats en la tecnología del moldeig per ultrasons ha fet que aquesta sigui una tecnología més apropiada per la fabrició de petites sèries. El moldeig per ultrasons permet fondre, moldejar i solidificar la quantitat necessària per fer una peça petita, evitant així una gran pèrdua de material en les zones de colades. Aquesta tesi doctoral és una contribució al coneixement del procés de micro-injecció per ultrasons amb materials d’altres prestacions com el polifenilsulfona PPSU i el polieteretercetona PEEK, establint relacions entre els paràmetres de processat i les propietats mecàniques del producte, establint un aspecte clau en la producció de futures peces Advisors/Committee Members: [email protected] (authoremail), false (authoremailshow), Ciurana, Quim de (director).

Subjects/Keywords: Ultrasound technology; Tecnologia d'ultrasò; Tecnología de ultrasonido; Amplitude; Amplitud; PPSV; Polifenilsulfone; Ultrasonic micro-moulding; Micro-modelatge per ultrasons; Micro-modeo por ultrasonidos; Weld line; Línia de soldadura; Línea de soldadura; PEEK; Polieteretercetone; 624; 620

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Dorf, T. (2019). Contributions to ultrasonic micro-moulding process of high performance polymers. (Thesis). Universitat de Girona. Retrieved from http://hdl.handle.net/10803/667506

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Dorf, Tomasz. “Contributions to ultrasonic micro-moulding process of high performance polymers.” 2019. Thesis, Universitat de Girona. Accessed January 26, 2020. http://hdl.handle.net/10803/667506.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Dorf, Tomasz. “Contributions to ultrasonic micro-moulding process of high performance polymers.” 2019. Web. 26 Jan 2020.

Vancouver:

Dorf T. Contributions to ultrasonic micro-moulding process of high performance polymers. [Internet] [Thesis]. Universitat de Girona; 2019. [cited 2020 Jan 26]. Available from: http://hdl.handle.net/10803/667506.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Dorf T. Contributions to ultrasonic micro-moulding process of high performance polymers. [Thesis]. Universitat de Girona; 2019. Available from: http://hdl.handle.net/10803/667506

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.