8 research outputs found
Evaporation-Induced Branched Structures from Sessile Nanofluid Droplets
We
investigate the formation of branched nanoparticle aggregates
resulting from the evaporation of sessile nanofluid droplets of the
copper water-based nanofluids experimentally. Both symmetric and asymmetric
drying patterns were found as the sessile droplet evaporated. A kinetic
Monte Carlo (KMC) approach is developed to explain the drying process
in a circular domain, representing the top view of a drying sessile
droplet. It is found that the lattice-gas-based Monte Carlo model
can describe the nanoparticle self-assembly into a solid highly branched
aggregate. While the chemical potential function is coupled to the
nondimensional spherical droplet size during evaporation, the results
reveal that the fingering contact line instabilities can emerge under
a given condition and force the formation of a branched nanoparticle
structure. The pattern comparison shows that the simulation results
have a qualitative agreement with the experiments. The parameter study
shows that the model parameters, such as domain diameter, chemical
potential distribution, particle interaction energy, and so on, have
significant influence on the resulting patterns
Evaporation-Induced Branched Structures from Sessile Nanofluid Droplets
We
investigate the formation of branched nanoparticle aggregates
resulting from the evaporation of sessile nanofluid droplets of the
copper water-based nanofluids experimentally. Both symmetric and asymmetric
drying patterns were found as the sessile droplet evaporated. A kinetic
Monte Carlo (KMC) approach is developed to explain the drying process
in a circular domain, representing the top view of a drying sessile
droplet. It is found that the lattice-gas-based Monte Carlo model
can describe the nanoparticle self-assembly into a solid highly branched
aggregate. While the chemical potential function is coupled to the
nondimensional spherical droplet size during evaporation, the results
reveal that the fingering contact line instabilities can emerge under
a given condition and force the formation of a branched nanoparticle
structure. The pattern comparison shows that the simulation results
have a qualitative agreement with the experiments. The parameter study
shows that the model parameters, such as domain diameter, chemical
potential distribution, particle interaction energy, and so on, have
significant influence on the resulting patterns
Evaporation-Induced Branched Structures from Sessile Nanofluid Droplets
We
investigate the formation of branched nanoparticle aggregates
resulting from the evaporation of sessile nanofluid droplets of the
copper water-based nanofluids experimentally. Both symmetric and asymmetric
drying patterns were found as the sessile droplet evaporated. A kinetic
Monte Carlo (KMC) approach is developed to explain the drying process
in a circular domain, representing the top view of a drying sessile
droplet. It is found that the lattice-gas-based Monte Carlo model
can describe the nanoparticle self-assembly into a solid highly branched
aggregate. While the chemical potential function is coupled to the
nondimensional spherical droplet size during evaporation, the results
reveal that the fingering contact line instabilities can emerge under
a given condition and force the formation of a branched nanoparticle
structure. The pattern comparison shows that the simulation results
have a qualitative agreement with the experiments. The parameter study
shows that the model parameters, such as domain diameter, chemical
potential distribution, particle interaction energy, and so on, have
significant influence on the resulting patterns
Elimination of the Coffee-Ring Effect by Promoting Particle Adsorption and Long-Range Interaction
A Monte
Carlo model has been developed to investigate the transition
from the coffee-ring deposition to the uniform coverage in drying
pinned sessile colloidal droplets.
The model applies the diffusion-limited aggregation (DLA) approach
coupled with the biased random walk (BRW) to simulate the particle
migration and agglomeration during the droplet drying process. It
is shown that the simultaneous presence of the particle adsorption,
long-range attraction, and circulatory motion processes is important
for the transition from the coffee-ring effect to the uniform deposition
of finally dried particles. The absence of one of the specified factors
favors the coffee-ring deposition near the droplet boundary. The strong
outward capillary flow on the latest evaporation stage can easily
destroy the entire particle pre-ordering at the early drying stages.
The formation of a robust particle structure is required to resist
the outward flow and alter the coffee-ring effect
Evaporation-Induced Branched Structures from Sessile Nanofluid Droplets
We
investigate the formation of branched nanoparticle aggregates
resulting from the evaporation of sessile nanofluid droplets of the
copper water-based nanofluids experimentally. Both symmetric and asymmetric
drying patterns were found as the sessile droplet evaporated. A kinetic
Monte Carlo (KMC) approach is developed to explain the drying process
in a circular domain, representing the top view of a drying sessile
droplet. It is found that the lattice-gas-based Monte Carlo model
can describe the nanoparticle self-assembly into a solid highly branched
aggregate. While the chemical potential function is coupled to the
nondimensional spherical droplet size during evaporation, the results
reveal that the fingering contact line instabilities can emerge under
a given condition and force the formation of a branched nanoparticle
structure. The pattern comparison shows that the simulation results
have a qualitative agreement with the experiments. The parameter study
shows that the model parameters, such as domain diameter, chemical
potential distribution, particle interaction energy, and so on, have
significant influence on the resulting patterns
Elimination of the Coffee-Ring Effect by Promoting Particle Adsorption and Long-Range Interaction
A Monte
Carlo model has been developed to investigate the transition
from the coffee-ring deposition to the uniform coverage in drying
pinned sessile colloidal droplets.
The model applies the diffusion-limited aggregation (DLA) approach
coupled with the biased random walk (BRW) to simulate the particle
migration and agglomeration during the droplet drying process. It
is shown that the simultaneous presence of the particle adsorption,
long-range attraction, and circulatory motion processes is important
for the transition from the coffee-ring effect to the uniform deposition
of finally dried particles. The absence of one of the specified factors
favors the coffee-ring deposition near the droplet boundary. The strong
outward capillary flow on the latest evaporation stage can easily
destroy the entire particle pre-ordering at the early drying stages.
The formation of a robust particle structure is required to resist
the outward flow and alter the coffee-ring effect
Elimination of the Coffee-Ring Effect by Promoting Particle Adsorption and Long-Range Interaction
A Monte
Carlo model has been developed to investigate the transition
from the coffee-ring deposition to the uniform coverage in drying
pinned sessile colloidal droplets.
The model applies the diffusion-limited aggregation (DLA) approach
coupled with the biased random walk (BRW) to simulate the particle
migration and agglomeration during the droplet drying process. It
is shown that the simultaneous presence of the particle adsorption,
long-range attraction, and circulatory motion processes is important
for the transition from the coffee-ring effect to the uniform deposition
of finally dried particles. The absence of one of the specified factors
favors the coffee-ring deposition near the droplet boundary. The strong
outward capillary flow on the latest evaporation stage can easily
destroy the entire particle pre-ordering at the early drying stages.
The formation of a robust particle structure is required to resist
the outward flow and alter the coffee-ring effect
Elimination of the Coffee-Ring Effect by Promoting Particle Adsorption and Long-Range Interaction
A Monte
Carlo model has been developed to investigate the transition
from the coffee-ring deposition to the uniform coverage in drying
pinned sessile colloidal droplets.
The model applies the diffusion-limited aggregation (DLA) approach
coupled with the biased random walk (BRW) to simulate the particle
migration and agglomeration during the droplet drying process. It
is shown that the simultaneous presence of the particle adsorption,
long-range attraction, and circulatory motion processes is important
for the transition from the coffee-ring effect to the uniform deposition
of finally dried particles. The absence of one of the specified factors
favors the coffee-ring deposition near the droplet boundary. The strong
outward capillary flow on the latest evaporation stage can easily
destroy the entire particle pre-ordering at the early drying stages.
The formation of a robust particle structure is required to resist
the outward flow and alter the coffee-ring effect