Polymer microsieves manufactured by inkjet technology

Langmuir

Volumn 25, Issue 1, 2009, Pages 606-610

  Jahn, Stephan F ^a   Engisch, Lutz ^a   Baumann, Reinhard R ^a   Ebert, Susann ^a   Goedel, Werner A ^a  

^a CHEMNITZ UNIVERSITY OF TECHNOLOGY   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

DROPS; LIQUIDS; POLYMER SOLUTIONS; POLYMERS;

HYDROPHOBIC SOLIDS; INK-JET PRINTINGS; INK-JET TECHNOLOGIES; LIQUID LAYERS; MICROSIEVES; POLYMER LAYERS; SESSILE DROPS; THIN LIQUID LAYERS; WATER-BASED;

PHASE INTERFACES;

POLYMER;

ARTICLE; CHEMISTRY;

POLYMERS;

EID: 60849120778     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la802860n     Document Type: Article

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25. To calculate the theoretical prediction, a value for the contact angle φ is needed. We assume that the moment the drops are printed their shape is consistent with the advancing contact angle air/aqueous phase/substrate. When the drops are covered with the polymer solution, the contact angle might change to the receding contact angle polymer solution/aqueous phase/substrate if this is larger than the original one obtained during printing or to the advancing contact angle polymer solution/aqueous phase/substrate if this is smaller than the original one. To be precise, this contact angle needs to be estimated for exactly the composition at which the polymer solution vitrifies or forms a gel. This is not available. Thus, as an approximation we choose to use the contact angle of chloroform/aqueous phase/substrate. The advancing contact angle of air/aqueous phase/substrate is between the advancing and the receding contact angle of chloroform/aqueous phase/substrate. We thus assume that the contact line is pinned during application of the polymer solution and thus use the advancing contact angle of air/aqueous phase/substrate for our calculations.
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