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Injection Molded Nanostructures Together with Hearing Instrument Materials

Falkvall, Frida LU and Orstadius, Ulrika LU (2016) BMEM01 20161
Department of Biomedical Engineering
Abstract
The purpose of this Master's Thesis was to gain insight to how injection molded nanostructures could be used together with hearing instrument materials. The reason to investigate this new nanotechnology was to see if it is of interest for Oticon to invest in. To reach conclusions, literature was studied regarding surfaces wetting properties, capillary effects, adhesion and material properties. Surface properties of different polymers were determined by measuring contact angles and surface energies. Thereafter, two tools were designed in collaboration with Oticon and Transform in order to test how well Oticons hearing aid materials could replicate the nanostructures. The two test geometries were also created to test capillarity and glue... (More)
The purpose of this Master's Thesis was to gain insight to how injection molded nanostructures could be used together with hearing instrument materials. The reason to investigate this new nanotechnology was to see if it is of interest for Oticon to invest in. To reach conclusions, literature was studied regarding surfaces wetting properties, capillary effects, adhesion and material properties. Surface properties of different polymers were determined by measuring contact angles and surface energies. Thereafter, two tools were designed in collaboration with Oticon and Transform in order to test how well Oticons hearing aid materials could replicate the nanostructures. The two test geometries were also created to test capillarity and glue adhesion.

From the contact angle and surface energy measurements, plus the two test geometries, some conclusions were made. All materials could replicate the nano\-structured pattern, where the semi-crystalline polyamide gave the best results. From the glue adhesion test it could be seen that the nanostructured material with the highest surface energy, amorphous polyamide, gave best results. Further it was also possible to draw the conclusion that in capillaries a nanostructured surface, together with a chemical coating, is able to hinder water ingress to some extent.

From the results of this project it is possible to further investigate whether this is an interesting technology for Oticon. Future studies could consist of studying wear of the tools and how nanostructures are replicated on curved geometries. (Less)
Popular Abstract
Injection Molded Nanostructures Together with Hearing Instrument Materials

A human right and strong need is to be able to move freely and therefore robustness of the hearing instrument is very important for the users since they depend on their instruments. While many hearing aids of today are able to fulfill many functions that enables hearing a lot of the hearing aids provided still do not give the users an experience of total freedom. This is because many of the instruments have problems with water ingress. Being stopped because of being hearing impairment in everyday situations are beyond frustrating e.g. removing the instrument due to heavy rain. Still if no other options are present, we adapt. We feel fine with not being able to... (More)
Injection Molded Nanostructures Together with Hearing Instrument Materials

A human right and strong need is to be able to move freely and therefore robustness of the hearing instrument is very important for the users since they depend on their instruments. While many hearing aids of today are able to fulfill many functions that enables hearing a lot of the hearing aids provided still do not give the users an experience of total freedom. This is because many of the instruments have problems with water ingress. Being stopped because of being hearing impairment in everyday situations are beyond frustrating e.g. removing the instrument due to heavy rain. Still if no other options are present, we adapt. We feel fine with not being able to hear when it is raining outside, but should we? (Less)
Please use this url to cite or link to this publication:
author
Falkvall, Frida LU and Orstadius, Ulrika LU
supervisor
organization
course
BMEM01 20161
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Nanostructures, Injection Molding, Superhydrophobic, Superhydrophilic, Capillarity, Adhesion, Polyamid, Contact Angle, Surface Energy, Oticon
language
English
additional info
2016-10
id
8882970
date added to LUP
2016-07-04 11:15:30
date last changed
2016-07-04 11:15:30
@misc{8882970,
  abstract     = {The purpose of this Master's Thesis was to gain insight to how injection molded nanostructures could be used together with hearing instrument materials. The reason to investigate this new nanotechnology was to see if it is of interest for Oticon to invest in. To reach conclusions, literature was studied regarding surfaces wetting properties, capillary effects, adhesion and material properties. Surface properties of different polymers were determined by measuring contact angles and surface energies. Thereafter, two tools were designed in collaboration with Oticon and Transform in order to test how well Oticons hearing aid materials could replicate the nanostructures. The two test geometries were also created to test capillarity and glue adhesion.

From the contact angle and surface energy measurements, plus the two test geometries, some conclusions were made. All materials could replicate the nano\-structured pattern, where the semi-crystalline polyamide gave the best results. From the glue adhesion test it could be seen that the nanostructured material with the highest surface energy, amorphous polyamide, gave best results. Further it was also possible to draw the conclusion that in capillaries a nanostructured surface, together with a chemical coating, is able to hinder water ingress to some extent. 

From the results of this project it is possible to further investigate whether this is an interesting technology for Oticon. Future studies could consist of studying wear of the tools and how nanostructures are replicated on curved geometries.},
  author       = {Falkvall, Frida and Orstadius, Ulrika},
  keyword      = {Nanostructures,Injection Molding,Superhydrophobic,Superhydrophilic,Capillarity,Adhesion,Polyamid,Contact Angle,Surface Energy,Oticon},
  language     = {eng},
  note         = {Student Paper},
  title        = {Injection Molded Nanostructures Together with Hearing Instrument Materials},
  year         = {2016},
}