TY - GEN
T1 - Dynamics of droplet absorption into fibrous materials
AU - Vishnyakova, Maria
AU - Cruz, Austin
AU - Callegari, Gerardo
PY - 2015
Y1 - 2015
N2 - This project studies the mechanism of droplet penetration into a non-woven fibrous material. Liquid droplet interaction with fibrous materials is important in composite materials and biomedical applications like bio-sensing and tissue engineering. Understanding these dynamics is the first step in designing novel hierarchical composite materials where a polymeric solution is sprayed on a fibrous mat. In our experiments, droplets of a glycerol-ethanol solution were placed on the fibrous material and their absorption was recorded with a video camera. The liquid is a model for polymeric solutions which would be used in the future to produce secondary structures after solvent evaporation. The total absorption time, and the evolution of contact area and drop volume with time, were measured. There are two common regimes of droplet absorption: Constant Contact Area and Constant Contact Angle. In this case, there is a combination of the two regimes: the drop spreads, reaches a plateau, and then retracts. The fibrous material was characterized by measuring the porosity, fiber size distribution, and the mean pore capillary radius, contact angle and in-plane permeability by capillary rise experiments. A semi-empirical model was used to calculate trans-planar permeability using the mean fiber radius and porosity. A simple model based on Lucas-Washburn dynamics describing the porous material with two parameters (permeability and capillary radius), and describing droplet absorption as pure in-plane penetration with the maximum droplet area, shows good agreement with experimental results.
AB - This project studies the mechanism of droplet penetration into a non-woven fibrous material. Liquid droplet interaction with fibrous materials is important in composite materials and biomedical applications like bio-sensing and tissue engineering. Understanding these dynamics is the first step in designing novel hierarchical composite materials where a polymeric solution is sprayed on a fibrous mat. In our experiments, droplets of a glycerol-ethanol solution were placed on the fibrous material and their absorption was recorded with a video camera. The liquid is a model for polymeric solutions which would be used in the future to produce secondary structures after solvent evaporation. The total absorption time, and the evolution of contact area and drop volume with time, were measured. There are two common regimes of droplet absorption: Constant Contact Area and Constant Contact Angle. In this case, there is a combination of the two regimes: the drop spreads, reaches a plateau, and then retracts. The fibrous material was characterized by measuring the porosity, fiber size distribution, and the mean pore capillary radius, contact angle and in-plane permeability by capillary rise experiments. A semi-empirical model was used to calculate trans-planar permeability using the mean fiber radius and porosity. A simple model based on Lucas-Washburn dynamics describing the porous material with two parameters (permeability and capillary radius), and describing droplet absorption as pure in-plane penetration with the maximum droplet area, shows good agreement with experimental results.
UR - http://www.scopus.com/inward/record.url?scp=84970006300&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84970006300&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84970006300
T3 - Engineering Sciences and Fundamentals 2015 - Core Programming Area at the 2015 AIChE Annual Meeting
SP - 262
BT - Engineering Sciences and Fundamentals 2015 - Core Programming Area at the 2015 AIChE Annual Meeting
PB - AIChE
T2 - Engineering Sciences and Fundamentals 2015 - Core Programming Area at the 2015 AIChE Annual Meeting
Y2 - 8 November 2015 through 13 November 2015
ER -