search query: @keyword viscosity / total: 25
results-list
reference: 10 / 25
« previous | next »
Author:Häggblom, Martin
Title:Water - nanocellulose interactions and optimization
Vatten - nanocellulosa växelverkan och optimering
Publication type:Master's thesis
Publication year:2012
Pages:80 + [2]      Language:   eng
Department/School:Biotekniikan ja kemian tekniikan laitos
Main subject:Teollisuuden ympäristötekniikka   (Puu-127)
Supervisor:Dahl, Olli
Instructor:Vuorenpalo, Veli-Matti
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
Instructions
close

Reading digital theses in the closed network of the Aalto University Harald Herlin Learning Centre

In the closed network of Learning Centre you can read digital and digitized theses not available in the open network.

The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/

You can read theses on the Learning Centre customer computers, which are available on all floors.

Logging on to the customer computers

  • Aalto University staff members log on to the customer computer using the Aalto username and password.
  • Other customers log on using a shared username and password.

Opening a thesis

  • On the desktop of the customer computers, you will find an icon titled:

    Aalto Thesis Database

  • Click on the icon to search for and open the thesis you are looking for from Aaltodoc database. You can find the thesis file by clicking the link on the OEV or OEVS field.

Reading the thesis

  • You can either print the thesis or read it on the customer computer screen.
  • You cannot save the thesis file on a flash drive or email it.
  • You cannot copy text or images from the file.
  • You cannot edit the file.

Printing the thesis

  • You can print the thesis for your personal study or research use.
  • Aalto University students and staff members may print black-and-white prints on the PrintingPoint devices when using the computer with personal Aalto username and password. Color printing is possible using the printer u90203-psc3, which is located near the customer service. Color printing is subject to a charge to Aalto University students and staff members.
  • Other customers can use the printer u90203-psc3. All printing is subject to a charge to non-University members.
Location:P1 Ark Aalto  2241   | Archive
Keywords:nanocellulose
water
interaction
drying
redispersion
viscosity
transmittance
nanocellulosa
vatten
växelverkan
torkning
återdispergering
viskositet
transmittans
Abstract (eng): The purpose of this Master's thesis was to study the interactions of water and cellulose nanoparticles.
The aim of the theoretical part of the thesis was to provide an interdisciplinary understanding basis for water -nanocellulose interactions.
In the experimental part the findings of the theoretical part were used to develop and validate informative, scalable, and convenient characterization procedures of nanocelluloses in aqueous suspensions.

As a result of the theoretical part, two different grades of nanocellulose were developed.
These nanocellulose grades were able to re-disperse in water after drying, still maintaining the material properties.
In the experimental part, the particle size of nanocellulose in water correlated with viscosity at different shear-rates.
Further on, the viscosity differences of the dried nanocelluloses and the reference were small.
The same type of viscosity fluctuations was also observed for other samples.
Also, transmittance measurements showed significant particle size dependence and in addition stable measurement values.
The transmittance percentage difference for nanocelluloses of known particle size ranges was 36.82 % at 850 nm, while the corresponding value for the dried and re-dispersed nanocellulose grades were -0.07 % and 2.40 % compared to the reference.
Scanning electron microscopy images and pulp -nanocellulose composite characterizations confirmed the findings of the viscosity and transmittance measurements.

As a conclusion of the theoretical part, it can be confirmed that the studied area is of absolute importance for water -nanocellulose processes and applications such as drying and redispersion.
The objective of the experimental part was also accomplished.
Viscosity and especially transmittance measurements were sensitive to the particle size of nanocellulose.
Further on, they were convenient and stable measurements, in particular transmittance.
Abstract (swe): Avsikten med detta diplomarbete var att undersöka växelverkan mellan vatten och cellulosananopartiklar.
Målet med den teoretiska delen var att bilda en tvärvetenskaplig förståelse för växelverkan mellan vatten och nanocellulosa.
Baserat på slutsatserna från den teoretiska delen utvecklades och bekräftades i den experimentella delen informationsrika, skalbara och lättanvända karaktäriseringstekniker av nanocellulosa i vattenlösningar.

Som ett resultat av den teoretiska delen utvecklades två sorters nanocellulosor.
Dessa kunde lösas upp i vatten efter torkning utan att materialegenskaperna försämrades.
I den experimentella delen korrelerade partikelstorleken med viskositeten vid olika skjuvhastigheter.
Dessutom var viskositetsskillnaderna mellan de torkade nanocellulosorna och referensvärdena obefintliga.
Samma typ av viskositetsfluktuationer iakttogs också för andra nanocellulosasorter.
Transmittansmätningarna korrelerade också starkt med partikelstorleken samt uppvisade stabila mätvärden.
Den procentuella transmittansskillnaden mellan nanocellulosor av känd partikelstorleksklass var 36,82 % vid 850 nm, medan motsvarande värde för de torkade och återdispergerade nanocellulosorna var -0,07 % och 2,40 % i jämförelse med referensmaterialet.
Viskositets- och transmittansmätvärden bekräftades genom svepelektronmikroskopi och karaktärisering av cellulosa massa -nanocellulosa kompositer.

Som slutsats av den teoretiska delen, kan det bekräftas att de undersökta områdena spelar en avgörande roll för vatten -nanocellulosa processer och applikationer, så som torkning och återdispergering.
Målet med den experimentella delen uppnåddes också.
Viskositets och speciellt transmittansmätningarna var känsliga gentemot partikelstorleken av nanocellulosa.
Dessutom var mätningarna behändiga och stabila, speciellt transmittansmätningarna.
ED:2012-06-25
INSSI record number: 44709
+ add basket
« previous | next »
INSSI