Novel oil resistant cellulosic materials

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Fältnamn	Indikatorer	Metadata
000		05428nam a2200433 4500
001		oai:DiVA.org:kth-11494
003		SwePub
008		091117s2009 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
020		a 9789174154764q print
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-114942 URI
040		a (SwePub)kth
041		a engb eng
042		9 SwePub
072	7	a vet2 swepub-contenttype
072	7	a dok2 swepub-publicationtype
100	1	a Aulin, Christian,d 1980-u KTH,Fiberteknologi,Fibertechnology4 aut0 (Swepub:kth)u1xe45sr
245	1 0	a Novel oil resistant cellulosic materials
264	1	a Stockholm :b KTH,c 2009
300		a ix, 55 s.
338		a electronic2 rdacarrier
490	0	a Trita-CHE-Report,x 1654-1081 ;v 2009:57
500		a QC 20100623
520		a The aim of this study has been to prepare and characterise oil resistant cellulosic materials, ranging from model surfaces to papers and aerogels. The cellulosic materials were made oil resistant by chemical and topographic modifications, based on surface energy, surface roughness and barrier approaches. Detailed wetting studies of the prepared cellulosic materials were made using contact angle measurements and standardised penetration tests with different alkanes and oil mixtures. A significant part of the activities were devoted to the development of model cellulosic surfaces with different degrees of crystalline ordering for the wetting studies. Crystalline cellulose I, II and amorphous cellulose surfaces were prepared by spin-coating of cellulose nanocrystal or microfibrillated cellulose (MFC) dispersions, with Langmuir-Schaefer (LS) films or by a layer-by-layer (LbL) deposition technique. The formation of multilayers consisting of polyethyleneimine (PEI)/anionic MFC or cationic MFC/anionic MFC was further studied and optimized in terms of total layer thickness and adsorbed amount by combining Dual Polarization Interferometry (DPI) or Stagnation Point Adsorption Reflectrometry (SPAR) with a Quartz Crystal Microbalance with Dissipation (QCM-D). The smooth cellulosic surfaces prepared had different molecular and mesostructure properties and different surface energies as shown by X-ray diffraction, Atomic Force Microscopy (AFM) imaging, ellipsometry measurements and contact angle measurements. The cellulose model surfaces were found to be ideal for detailed wetting studies, and after the surface has been coated or covalently modified with various amounts of fluorosurfactants, the fluorinated cellulose films were used to follow the spreading mechanisms of different oil mixtures. The viscosity and surface tension of the oil mixtures, as well as the dispersive surface energy of the cellulose surfaces, were found to be essential parameters governing the spreading kinetics. A strong correlation was found between the surface concentration of fluorine, the dispersive surface energy and the measured contact angle of the oil mixtures. Silicon surfaces possessing structural porous characteristics were fabricated by a plasma etching process. The structured silicon surfaces were coated with sulfate-stabilized cellulose I nanocrystals using the LbL technique. These artificial intrinsically oleophilic cellulose surfaces were made highly oleophobic when coated with a thin layer of fluorinated silanes. By comparison with flat cellulose surfaces, which are oleophilic, it is demonstrated that the surface energy and the surface texture are essential factors preventing oil from spreading on the surface and, thus, inducing the observed macroscopic oleophobic properties. The use of the MFC for surface coating on base papers demonstrated very promising characteristics as packaging materials. Environmental-Scanning Electron Microscopy (E-SEM) micrographs indicated that the MFC layer reduced the sheet porosity, i.e. the dense structure formed by the nanofibers resulted in superior oil barrier properties. Attempts were made to link the procedure for preparation of the MFC dispersions to the resulting microstructure of the coatings, and film porosity and the film moisture content to the resulting permeability properties. Finally, MFC aerogels were successfully prepared by freeze-drying. The surface texture of the porous aerogels was carefully controlled by adjusting the concentration of the MFC dispersion used for the freeze-drying. The different scales of roughness of the MFC aerogels were utilised, together with the very low surface energy created by fluorination of the aerogel, to induce highly oleophobic properties.
650	7	a TEKNIK OCH TEKNOLOGIERx Materialteknikx Pappers-, massa- och fiberteknik0 (SwePub)205032 hsv//swe
650	7	a ENGINEERING AND TECHNOLOGYx Materials Engineeringx Paper, Pulp and Fiber Technology0 (SwePub)205032 hsv//eng
653		a oleophobic
653		a MFC
653		a cellulose
653		a oil resistant
653		a contact angle
653		a XPS
653		a SEM
653		a Cellulose and paper engineering
653		a Cellulosa- och pappersteknik
700	1	a Wågberg, Lars,c Prof.u KTH,Fiber- och polymerteknologi4 ths0 (Swepub:kth)u14jbte3
700	1	a Gray, Derek,c Prof.u McGill University4 opn
710	2	a KTHb Fiberteknologi4 org
856	4	u https://kth.diva-portal.org/smash/get/diva2:277300/FULLTEXT01.pdfx primaryx Raw objecty fulltext
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11494

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