Novel insights into the dispersed and acid-mediated surface modification of the carbon nanofibers

Turan, Kamini; Kaur, Prabhsharan; Manhas, Dinesh; Sharma, Jadab; Verma, Gaurav

doi:10.1016/j.matchemphys.2019.121978

Cited by 11 publications

(9 citation statements)

References 43 publications

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“…The sulfur content (< 0.1 %) in parental AC carries forward into the modified carbons. The acid treatment confirms chemical oxidation by an increase in oxygen content (12.7 %), compared to parental AC that provides significant functional (À COOH and À OH) groups for amine anchoring [28] In the case of AC-NT, nitrogen and hydrogen content increased considerably, which confirms the presence of NH group on the surface. However, a considerable amount of oxygen is also present after amine anchoring which might be either the unreacted acid groups or physisorbed atmospheric oxygen.…”

Section: Characterization Of Surface-modified Carbonmentioning

confidence: 57%

The Synergistic Character of Highly N‐Doped Coconut–Shell Activated Carbon for Efficient CO₂ Capture

et al. 2021

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The coconut shell-based activated carbon (AC) surface was effectively anchored with amine moieties with acid treatment followed by tetraethylenepentamine (TEPA) anchoring. The activated carbon surface enhanced with basicity is likely to increase the sorbent properties towards CO 2 adsorption. The AC surface was modified by varying TEPA concentrations. After amine doping, significant loss in textural property indicates their occupation inside the pores and surfaces. Further, the samples were thermally activated to retrieve the textural properties. The physicochemical properties of modified carbon were characterized using BET, TPD, FT-IR, Raman spectroscopy and elemental composition. The amine-modified and thermally activated carbons were tested for CO 2 adsorption up to 25 bar at 25°C. The acid-base properties of N-doped carbons were evaluated using isopropanol as a model test reaction at atmospheric pressure. The IPA reaction products of acetone and propene were quantified for their acid-base nature and correlated to CO 2 adsorption capacities. The CO 2 adsorption capacity increases by tailoring synergistic properties between surface basicity and micropores. Hence, 20 % TEPA-derived nitrogen-enriched carbon reveals a higher yield of acetone 73 %, which in turn enhanced CO 2 adsorption capacity of 9.9 mmol/g, and it is found to be a suitable applicant for CO 2 capture.

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Section: Characterization Of Surface-modified Carbonmentioning

confidence: 57%

The Synergistic Character of Highly N‐Doped Coconut–Shell Activated Carbon for Efficient CO₂ Capture

et al. 2021

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“…In sol–gel chemistry, it is known that acids or bases act as catalysts for the hydrolysis of TEOS, which implies that the hydrolysis of TEOS accumulated on CNFs might be catalyzed if acidic functional groups were present on the CNF surfaces. Previous studies have shown that various functional groups can be introduced by acid treatment of CNTs and CNFs. , Thus, we prepared acid-treated CNFs and examined the effect of different acid treatments on the formation of silica nanolayers.…”

Section: Resultsmentioning

confidence: 99%

Coating of Silica Nanolayers on Carbon Nanofibers via the Precursor Accumulation Method

et al. 2020

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Surface modification of nanocarbons, for example, by coating with oxide nanolayers, is a research topic of significant interest because of the drastic changes in the physicochemical properties of the modified nanocarbons. One simple method of creating these oxide nanolayer coatings on nanocarbons is the precursor accumulation (PA) technique, which entails the following: (1) a precursor solution is added dropwise onto nanocarbon powder; (2) the solvent is dried, leaving the accumulated precursor on the nanocarbon surface; and (3) hydrolysis or decomposition of the precursor in air leads to the formation of oxide nanolayers on the nanocarbons. In this study, tetraethoxysilane (TEOS) was used as a precursor for coating silica nanolayers onto carbon nanofibers (CNFs). TEOS is so stable that it hardly undergoes hydrolysis on the surface of pristine CNFs. By treating CNFs with H 2 SO 4 / HNO 3 , acidic functional groups were introduced onto the CNF surfaces. Silica nanolayers were successfully synthesized on these acid-treated CNFs via PA coating because the acidic functional groups catalyzed the hydrolysis of TEOS accumulated on the CNF surfaces. Scanning transmission electron microscopy indicated that the thickness of silica layer is approximately several nanometers. Pore size distribution analysis for the silica nanolayer suggested the presence of nanopores with 3−5 nm. The TEOS molecules could have accessed the functional groups through the nanopore; therefore, the number of silica nanolayers formed increased with the number of PA coatings. Finally, we compared the PA coating with conventional sol−gel and atomic layer deposition techniques.

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“…Dispersion of conductive nanofillers is critical for the electrical/mechanical properties of polymer nanocomposites. Processing methods such as in‐situ polymerization, [ 70 ] covalent modification, [ 71 ] non‐covalent modification, [ 72 ] etc. can improve the dispersion quality of the nanofillers.…”

Section: Proteins As Structure‐control Agentsmentioning

confidence: 99%

Protein‐Engineered Functional Materials for Bioelectronics

Chen

et al. 2020

Adv Funct Materials

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Structural and compositional diversities of proteins generate a number of functions for fabricating novel and advanced materials. Recent progress in protein engineering endows flexible approaches and new functionalities, which makes the fabricated materials potentially applicable in a broad spectrum of fields. Such engineering strategies by applying proteins alone or together with other molecules derive numerous functional materials such as patterned nanometal materials/nanometallic compounds, well‐designed nanocomposites, etc. Advantages in materials’ tunability, property improvement (e.g., electronic and mechanical properties, etc.), functionalities, and biocompatibility have been demonstrated, thus providing alternatives to existing materials via conventional methods. This review summarizes and discusses the strategies of fabricating functional materials using proteins as the critical contributors. Benefiting from their versatility, proteins find their roles in engineering functional materials via acting as structure‐control agents, reaction agents, and battery components, which are emphasized in this review. The strategies of each group of functions are specifically detailed. Properties of protein‐engineered functional materials and their potential applications in the fields of microelectronics, energy storage and conversion, sensor devices, etc. are also reviewed.

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Novel insights into the dispersed and acid-mediated surface modification of the carbon nanofibers

Cited by 11 publications

References 43 publications

The Synergistic Character of Highly N‐Doped Coconut–Shell Activated Carbon for Efficient CO₂ Capture

The Synergistic Character of Highly N‐Doped Coconut–Shell Activated Carbon for Efficient CO₂ Capture

Coating of Silica Nanolayers on Carbon Nanofibers via the Precursor Accumulation Method

Protein‐Engineered Functional Materials for Bioelectronics

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Novel insights into the dispersed and acid-mediated surface modification of the carbon nanofibers

Cited by 11 publications

References 43 publications

The Synergistic Character of Highly N‐Doped Coconut–Shell Activated Carbon for Efficient CO2 Capture

The Synergistic Character of Highly N‐Doped Coconut–Shell Activated Carbon for Efficient CO2 Capture

Coating of Silica Nanolayers on Carbon Nanofibers via the Precursor Accumulation Method

Protein‐Engineered Functional Materials for Bioelectronics

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Product

Resources

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The Synergistic Character of Highly N‐Doped Coconut–Shell Activated Carbon for Efficient CO₂ Capture

The Synergistic Character of Highly N‐Doped Coconut–Shell Activated Carbon for Efficient CO₂ Capture