The Role of Electric Pressure/Stress Suppressing Pinhole Defect on Coalescence Dynamics of Electrified Droplet
, Ehsan Esmaili 2,3, Giho Kang 1, Baekhoon Seong 1, Hosung Kang 2, Jihoon Kim 4, Sunghwan Jung 2,3, Hyunggun Kim 5,* and Doyoung Byun 1,*Round 1
Reviewer 1 Report
Review of “The Role of Electrical Pressure/Stress Suppressing Pinhole Defect on Coalescence Dynamics of Electrified Droplet”
This work is interesting, some further comments which help to improve this work as listed below:
The English should be massively revised
Please justify why “we cannot stop emphasizing the importance of droplet coalescence.”
Please define all the acronyms before their first appearance in text, i.e. “DI water” and other
Please provide the units “is over 0.002 and 0.0035”
Be consistent with notation” Table III” and “Table 3”
Table 1 and 2 were introduced in this work but were not coted in text
The last sentence (from conclusion) can be removed or transferred in introduction
I suggest to use more novel references other wise the novelty seems rather poor; I suggest looking also to https://pubs.acs.org/doi/10.1021/acs.jpclett.0c02250
Author Response
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Reviewer 2 Report
This paper shows how an electric field effects the coalescence of droplets falling from a needle onto a liquid. The study focuses partly on the 'dimple' and shows how it decreases in height as the electric field increases and becomes a positive bump at high enough field. The data is very interesting because the supplementary material has videos taken with a high speed camera of the droplet coalescence process. The theory of the process is presented in detail with the experimental results and the videos. The paper is very well written. One question the authors could comment on is whether there are any interesting phenomena at lower voltages since the behavior changes greatly between 0 and 100 V. It could also be helpful to add some more comments related to the inset in Figure 6, where do these small variations originate?
Author Response
We tried to upload multiple files in MS word format to let the reviewer check the change with the function 'Track Change'. However, it has a problem uploading multiple files, so we uploaded it as one PDF file.
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Reviewer 3 Report
This manuscript presents systematic perspectives on the coalescence dynamics of electrified droplets, which is valuable for applications on printing and spray coating. Using the optimized electric and fluidic conditions, the pinhole effect can be significantly suppressed to enable perfect coating. The quality and the comprehensiveness of the work is undoubtable, yet some redundant data can be combined or moved to SI to make the reading more pleasant. Overall, I am happy to see this article published after addressing the minor comments below:
1- The concentric ring-like pattern of dimple is quite an interesting phenomenon. Could the authors give more elaborations on the detailed mechanism of dimple formation? In particular, could the authors give an estimate on the thickness of the dimples.
2- Could the authors comment on the aspect of how this study would transform when interfacing real world inks with higher viscosity and ionic strength.
3- For tilted surface or tilted ejection, how would those estimations and implications of this model change.
4- The roughness of the surface may play an important role when applying the findings of this study beyond industrial use. Could the authors provide some insights on this aspect.
5- The notations for vectors should be non-italic and in bold.
Author Response
We tried to upload multiple files in MS word format to let the reviewer check the change with the function 'Track Change'. However, it has a problem uploading multiple files, so we uploaded it as one PDF file.
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Reviewer 4 Report
Coatings-1190201
In this paper, the authors studied the air film entrapped inside the dimple, because is a critical factor that the affect sequential dynamics after coalescence and caused defects. In concrete, in this work the mechanism for the suppression of dimples was studied and investigated the effect of electrical pressure. Also, they analyzed the effect of the electrical stress on droplet coalescence and optimized the conditions in solution-based techniques.
In my opinion, this paper has the sufficiently quality for publication in Coatings with a minor revision
Comment
- Line 85, define DI. Revise all manuscript
- Line 88, define DC. Revise all manuscript
- Line 201, change ,where for where
- Complete the information of the part 3.2
- Define “cascade coalescence”
- Revise the presentation of the Figure 6
- Line 436, the values are 0.0020 and 0.0035?
Author Response
We tried to upload multiple files in MS word format to let the reviewer check the change with the function 'Track Change'. However, it has a problem uploading multiple files, so we uploaded it as one PDF file.
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Round 2
Reviewer 1 Report
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