Time-dependent Re-Aggregation of Colloidal Laponite Clay Suspensions

Time-dependent Re-Aggregation of Colloidal Laponite Clay Suspensions

We study a synthetic clay suspension of laponite by measuring transient electric birefringence (TEB) and dynamic light scattering (DLS) over time. Experiments show a strong dependence on stirring of the sample for anomalous TEB behaviour, consistent with the effect being caused by competing optical...

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Main Author: Stranger, Snorre
Format: Others
Language:English
Published: Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk 2014
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26370
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spelling ndltd-UPSALLA1-oai-DiVA.org-ntnu-263702014-09-15T04:46:41ZTime-dependent Re-Aggregation of Colloidal Laponite Clay SuspensionsengStranger, SnorreNorges teknisk-naturvitenskapelige universitet, Institutt for fysikkInstitutt for fysikk2014We study a synthetic clay suspension of laponite by measuring transient electric birefringence (TEB) and dynamic light scattering (DLS) over time. Experiments show a strong dependence on stirring of the sample for anomalous TEB behaviour, consistent with the effect being caused by competing optical contributions from single clay platelets and aggregates. Stirring must take place shortly before measurements, as samples will in the order of days reach an equilibrium where the anomalous effect is only observable by double pulse TEB measurements. Shaking a sample again after it is measured, does not reproduce the same time evolution, sample reaches equilibrium earlier. DLS show aggregates increasing in size and ratio with regard to platelets, supporting the TEB measurements. Student thesisinfo:eu-repo/semantics/bachelorThesistexthttp://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26370Local ntnudaim:11923application/pdfinfo:eu-repo/semantics/openAccess
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language English
format Others
sources NDLTD
description We study a synthetic clay suspension of laponite by measuring transient electric birefringence (TEB) and dynamic light scattering (DLS) over time. Experiments show a strong dependence on stirring of the sample for anomalous TEB behaviour, consistent with the effect being caused by competing optical contributions from single clay platelets and aggregates. Stirring must take place shortly before measurements, as samples will in the order of days reach an equilibrium where the anomalous effect is only observable by double pulse TEB measurements. Shaking a sample again after it is measured, does not reproduce the same time evolution, sample reaches equilibrium earlier. DLS show aggregates increasing in size and ratio with regard to platelets, supporting the TEB measurements.
author Stranger, Snorre
spellingShingle Stranger, Snorre
Time-dependent Re-Aggregation of Colloidal Laponite Clay Suspensions
author_facet Stranger, Snorre
author_sort Stranger, Snorre
title Time-dependent Re-Aggregation of Colloidal Laponite Clay Suspensions
title_short Time-dependent Re-Aggregation of Colloidal Laponite Clay Suspensions
title_full Time-dependent Re-Aggregation of Colloidal Laponite Clay Suspensions
title_fullStr Time-dependent Re-Aggregation of Colloidal Laponite Clay Suspensions
title_full_unstemmed Time-dependent Re-Aggregation of Colloidal Laponite Clay Suspensions
title_sort time-dependent re-aggregation of colloidal laponite clay suspensions
publisher Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk
publishDate 2014
url http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26370
work_keys_str_mv AT strangersnorre timedependentreaggregationofcolloidallaponiteclaysuspensions
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