Comparison of the surface activity of hemicelluloses extracted from spruce and birch sawdust

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.advisorXiang, Wenchao
dc.contributor.authorIshfaq, Amal
dc.contributor.schoolKemian tekniikan korkeakoulufi
dc.contributor.supervisorRojas, Orlando
dc.date.accessioned2018-12-14T16:04:28Z
dc.date.available2018-12-14T16:04:28Z
dc.date.issued2018-12-11
dc.description.abstractThis thesis investigated the surface activity of four extracted, unmodified hemicelluloses, namely, galactoglucomannan, GGM, phenolic galactoglucomannan, pGGM, glucuronoxylan, GX, and phenolic glucuronoxylan, pGX. It was determined that the relative amount of sugars was almost the same for GGM and pGGM as well as GX and pGX. With the increased concentration, the lowest surface tension was determined for pGX while the highest foamability and foam stability was observed for GX. The acetylation degree and the presence of residual lignin greatly affected the foam properties. The bubble size (optical microscopy) increased over time at increased concentration, owing to the combination of different foam destabilisation mechanisms. Hemicellulose aggregation was investigated via dynamic light scattering. In contrast to the aggregates formed by GGM and GX, which remained stable as the concentration was increased, those from pGGM and pGX became smaller. This is likely due to the presence of free and bound lignin. Overall, the better foamability and foam stability over time for GX suggest this extracted hemicellulose as an alternative to synthetic amphiphilic molecules.en
dc.format.extent92
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/35482
dc.identifier.urnURN:NBN:fi:aalto-201812146498
dc.language.isoenen
dc.locationPKfi
dc.programmeMaster's Programme in Chemical, Biochemical and Materials Engineeringfi
dc.programme.majorFibre and Polymer Engineeringfi
dc.programme.mcodeCHEM3024fi
dc.subject.keywordhemicellulosesen
dc.subject.keywordfoamsen
dc.subject.keywordacetyl groupsen
dc.subject.keywordligninen
dc.titleComparison of the surface activity of hemicelluloses extracted from spruce and birch sawdusten
dc.typeG2 Pro gradu, diplomityöfi
dc.type.ontasotMaster's thesisen
dc.type.ontasotDiplomityöfi
local.aalto.electroniconlyyes
local.aalto.openaccessno
Files