Characterization of cellulose type I und type II fibers using Atomic-Force Microscopy

Franz Schmied

Characterization of cellulose type I und type II fibers using Atomic-Force Microscopy

Titel in Übersetzung: Charakterisierung von Typ I und Typ II Cellulosefasern mit Hilfe der Rasterkraftmikroskopie

Franz Schmied

Lehrstuhl für Physik (460)

Publikation: Thesis / Studienabschlussarbeiten und Habilitationsschriften › Diplomarbeit

612 Downloads (Pure)

Abstract

Cellulose ist einer der wichtigsten nachwachsenden Rohstoffe unserer Zeit und zugleich die häufigste organische Verbindung der Erde. Dieser Rohstoff kann einerseits für die Papierherstellung als auch zur Textilproduktion verwendet werden. Im ersten Fall handelt es sich dabei um natürliche Cellulose, oder Cellulose Typ I, im zweiten Fall spricht man von so genannter Regeneratfaser oder Cellulose Typ II. Die Rasterkraftmikroskopie (atomic force microscopy AFM) wurde nun verwendet, um diese beiden Typen von Cellulosefasern näher zu charakterisieren. Der erste Teil der Diplomarbeit beschäftigt sich mit der Untersuchung natürlicher Cellulosefasern. Hierbei wurden Papierfasern der Firma Mondi Packaging Frantschach GmbH, St. Gertraud, Austria, verwendet, um die Morphologie an der Oberfläche zu charakterisieren. Die Beschaffenheit der Oberfläche ist neben der chemischen Zusammensetzung der Hauptgrund für die Faser-Faser Bindung im Papier. Mit Hilfe von AFM-"Phase imaging" konnte gezeigt werden, dass sich die Mikrofibrillen, die einen Durchmesser von etwa 40 nm haben, zu Faserbündeln von ca. 300 nm Durchmesser an der Oberfläche anordnen. Weiters konnte der Einfluss der Trocknungsbehandlung sowie der Ozonbehandlung auf die Fibrillenanordnung gezeigt werden. Der zweite Teil beschäftigt sich mit der inneren Struktur von Textilfasern, die neben der Chemie den größten Einfluss auf die makroskopischen Fasereigenschaften hat. Im Vordergrund stand die Untersuchung der Anordnung der Poren sowie deren Größe und Form. Hierzu wurden Querschnittsanalysen an Modal-, Viskose- und TENCEL(R)-Fasern der Firma Lenzing AG, Lenzing, Austria, durchgeführt. Um eine dreidimensionale Vorstellung zu erhalten, wurden in weiterer Folge Analysen an Längsschnitten durchgeführt. Mithilfe des AFM-"Phase imaging" war es möglich, die unterschiedlichen Morphologien der einzelnen Fasern auf der Nanometerskala sichtbar zu machen und die Porengrößen quantitativ zu erfassen.

Titel in Übersetzung	Charakterisierung von Typ I und Typ II Cellulosefasern mit Hilfe der Rasterkraftmikroskopie
Originalsprache	Englisch
Qualifikation	Dipl.-Ing.
Betreuer/-in / Berater/-in	Teichert, Christian, Betreuer (intern)
Datum der Bewilligung	14 März 2008
Publikationsstatus	Veröffentlicht - 2008

Bibliographische Notiz

gesperrt bis null

UN SDGs

Dieser Output leistet einen Beitrag zu folgendem(n) Ziel(en) für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Schlagwörter

AFM Phase Imaging Rasterkraftmikroskopie Cellulose Fasern Papier Lyocell TENCEL® Modal
Viskose

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title = "Characterization of cellulose type I und type II fibers using Atomic-Force Microscopy",

abstract = "Cellulose is one of the most important renewable raw materials in recent time and also the most frequently occurring organic compound in the world. This raw material can be used to produce either paper or textiles. In the first case the cellulose is called native cellulose or cellulose type I. In the second case the cellulose is known as regenerated cellulose or cellulose type II. Atomic force microscopy (AFM) was applied to characterize these two types of cellulose fibers. The first part of the diploma thesis deals with the investigation of paper fibers. Fibers from the Mondi Packaging Frantschach GmbH, St. Gertraud, Austria, were used to analyze the morphological behavior of the surface. The surface arrangement is beside the chemical composition the most important influence on the fiber-fiber bond. With AFM phase imaging it was possible to show the arrangement of micro fibrils with diameters of about 40 nm to main bundles with diameters of about 300 nm. It was also possible to reveal the influence of the drying and ozone treatments on the fibril arrangement. The second part deals with the investigation of the inner structure of textile fibers, which has - beside the chemical composition - the greatest influence on the macroscopic properties. The investigation focused to analyze the distribution of pores, their size and shape. Cross-sectional scans on Modal, Viscose and TENCEL(R) fibers from Lenzing AG, Lenzing, Austria, were done. To achieve a three-dimensional view of the fiber structure additional measurements on longitudinal cross-sections were performed. By means of AFM phase imaging, it was possible to reveal the different pore structure within the individual fibers on the nanometer scale and to determine quantitatively the pore size.",

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N2 - Cellulose is one of the most important renewable raw materials in recent time and also the most frequently occurring organic compound in the world. This raw material can be used to produce either paper or textiles. In the first case the cellulose is called native cellulose or cellulose type I. In the second case the cellulose is known as regenerated cellulose or cellulose type II. Atomic force microscopy (AFM) was applied to characterize these two types of cellulose fibers. The first part of the diploma thesis deals with the investigation of paper fibers. Fibers from the Mondi Packaging Frantschach GmbH, St. Gertraud, Austria, were used to analyze the morphological behavior of the surface. The surface arrangement is beside the chemical composition the most important influence on the fiber-fiber bond. With AFM phase imaging it was possible to show the arrangement of micro fibrils with diameters of about 40 nm to main bundles with diameters of about 300 nm. It was also possible to reveal the influence of the drying and ozone treatments on the fibril arrangement. The second part deals with the investigation of the inner structure of textile fibers, which has - beside the chemical composition - the greatest influence on the macroscopic properties. The investigation focused to analyze the distribution of pores, their size and shape. Cross-sectional scans on Modal, Viscose and TENCEL(R) fibers from Lenzing AG, Lenzing, Austria, were done. To achieve a three-dimensional view of the fiber structure additional measurements on longitudinal cross-sections were performed. By means of AFM phase imaging, it was possible to reveal the different pore structure within the individual fibers on the nanometer scale and to determine quantitatively the pore size.

AB - Cellulose is one of the most important renewable raw materials in recent time and also the most frequently occurring organic compound in the world. This raw material can be used to produce either paper or textiles. In the first case the cellulose is called native cellulose or cellulose type I. In the second case the cellulose is known as regenerated cellulose or cellulose type II. Atomic force microscopy (AFM) was applied to characterize these two types of cellulose fibers. The first part of the diploma thesis deals with the investigation of paper fibers. Fibers from the Mondi Packaging Frantschach GmbH, St. Gertraud, Austria, were used to analyze the morphological behavior of the surface. The surface arrangement is beside the chemical composition the most important influence on the fiber-fiber bond. With AFM phase imaging it was possible to show the arrangement of micro fibrils with diameters of about 40 nm to main bundles with diameters of about 300 nm. It was also possible to reveal the influence of the drying and ozone treatments on the fibril arrangement. The second part deals with the investigation of the inner structure of textile fibers, which has - beside the chemical composition - the greatest influence on the macroscopic properties. The investigation focused to analyze the distribution of pores, their size and shape. Cross-sectional scans on Modal, Viscose and TENCEL(R) fibers from Lenzing AG, Lenzing, Austria, were done. To achieve a three-dimensional view of the fiber structure additional measurements on longitudinal cross-sections were performed. By means of AFM phase imaging, it was possible to reveal the different pore structure within the individual fibers on the nanometer scale and to determine quantitatively the pore size.

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