Joule Heating of Carbon-Based Materials Obtained by Carbonization of Para-Aramid Fabrics
Round 1
Reviewer 1 Report
The manuscript is well-organised, easy to understand and read. The approach for conducting the experiments and comparative analyses is good. The authors also suggested the best method at the end of the manuscript. Therefore, it is acceptable for publication.
Author Response
Thank you for your review comments. We appreciate you time and availability to review our paper and accept the same for publication.
Reviewer 2 Report
The paper undertakes Joule heating of carbon-based materials obtained by carbonization of para-aramid fabrics.
Please:
- verify the article linguistically,
- describe the methodology and reproducibility of the results presented in 2.1. Materials,
- explain "a mixed gas atmosphere" in Method 2: Ammonium bicarbonate salt Method,
- present the repeatability of experimental results,
- present errors of all results presented in the paper,
- add references for all mathematical formulas taken from the literature.
Author Response
Thank you for your review comments. As per your suggestions, we’ve made modifications to the article. We’ve provided the responses to your kind comments. We appreciate your time and hope you find the modifications acceptable.
- verify the article linguistically,
Ans: The article reassessed linguistically and necessary changes have been made suitably through the entirety of the article.
- describe the methodology and reproducibility of the results presented in 2.1. Materials,
Ans: The details of the results have now been altered and limited to only stating parameters obtained by the manufacturing company (yarn count, density and moisture content) been added in 2.1. Materials. The elemental analysis is not relevant in this case and has been removed.
- explain "a mixed gas atmosphere" in Method 2: Ammonium bicarbonate salt Method,
Ans: the relevant description to this comment has been mentioned accordingly in line 101, Method 2.
- present the repeatability of experimental results,
Ans: The repeatability of experimental results has now been presented in lines 148, 170, 191 & Table 1.
- present errors of all results presented in the paper,
Ans: The errors have now been added, appropriately.
- add references for all mathematical formulas taken from the literature.
Ans: The relevant references have now been added, appropriately.
Reviewer 3 Report
The manuscript is devoted to two aspects of carbon containing materials: first, its creation using original heating technique, and, second, investigation of the thermal properties of resulting products. As a precursor, the fabrics wastes of Kevlar 29 were used, and this is appropriate way of practical application of these feedstocks. The heating system of fabrics is based on creation of electric current appeared under action of DC source of voltage dependent on material resistivity (so-called, ohmic heating). The carbonization process was carried out until temperature range 800-1100 C with a step of 100 C. In my mind, the most original experimental issue consists in development of oxygen-free atmosphere. In addition to traditional inert gas (N2), authors applied media, appeared at combusting (CO2 atmosphere), and at decomposition of ammonium bicarbonate (ammonia, water and carbon dioxide). These approaches lead to variation of the final product with maximum values in nitrogen and charcoal, and minimum values in ammonium bicarbonate. Then, the obtained carbon enriched fabrics were tested on a subject of heating with a weak current by means of measuring the surface temperature with IR camera.
I have some questions and notes:
1. What is the final image of the product; is it still fabrics or just black powder?
2. What is the composition of the final product, depending on method: carbon content and what else?
3. What is a structure of the product? Did authors observe the graphite structure?
4. What are the mechanical properties of the fabrics (or consisting of them fibers) after carbonization of very strong para-aramide fabrics and fibers?
It seems to me that it is important for authors to express to readers: what for such materials were obtained.
Author Response
Thank you for your review comments. As per your suggestions, we’ve made modifications to the article. We’ve provided the responses to your kind comments. We appreciate your time and hope you find the modifications acceptable. The responses with supporting details have been added in the document(attached here below)
Author Response File: 
Author Response.docx
Reviewer 4 Report
The paper presents valuable results on the investigation of electric properties of heat-modified industrial para-Aramid fabric material. Those electrically insulating materials were converted into conducting state using thermal treatment under a number of gaseous atmospheric condition set-ups. A certain model of the heating/cooling cycle was suggested.
As to reviewers comments, I would recommend to rewrite a few words in the beginning of the abstract. Particularly, in the following “Carbon rich materials obtained by the process of carbonization of industrial para-Aramid fabric wastes investigated for the realization of joule heating (ohmic heating) has been established in the present work.“
What exactly has been established? Rewrite to make it understandable, possibly within two shorter sentences.
I recommend this manuscript for publication after minor revision.
Regards, Reviewer
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Author Response
As to reviewers comments, I would recommend to rewrite a few words in the beginning of the abstract. Particularly, in the following “Carbon rich materials obtained by the process of carbonization of industrial para-Aramid fabric wastes investigated for the realization of joule heating (ohmic heating) has been established in the present work.“
Thank you for your review comments. As per your suggestions, we’ve made modifications to the article. We’ve provided the responses to your kind comments. We appreciate your time and hope you find the modifications acceptable.
What exactly has been established? Rewrite to make it understandable, possibly within two shorter sentences.
Ans: The relevant sentences have been altered based on your suggestion. We hope it is now well-defined.
