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Zhu, C., Soldatov, A. & Mathew, A. (2017). Advanced microscopy and spectroscopy reveal the adsorption and clustering of Cu(II) onto TEMPO-oxidized cellulose nanofibers. Nanoscale, 9(22), 7419-7428
Open this publication in new window or tab >>Advanced microscopy and spectroscopy reveal the adsorption and clustering of Cu(II) onto TEMPO-oxidized cellulose nanofibers
2017 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 9, no 22, p. 7419-7428Article in journal (Refereed) Published
Abstract [en]

TEMPO (2,2,6,6-tetramethylpiperidine-1-oxylradical)-mediated oxidation nanofibers (TOCNF), as a biocompatible and bioactive material, have opened up a new application of nanocellulose for the removal of water contaminants. This development demands extremely sensitive and accurate methods to understand the surface interactions between water pollutants and TOCNF. In this report, we investigated the adsorption of metal ions on TOCNF surfaces using experimental techniques atthe nano and molecular scales with Cu(II) as the target pollutant in both aqueous and dry forms. Imaging with in situ atomic force microscopy (AFM), together with a study of the physiochemical properties of TOCNF caused by adsorption with Cu(II) in liquid, were conducted using the PeakForce Quantitative NanoMechanics (PF-QNM) mode at the nano scale. The average adhesion force between the tip and the target single TOCNF almost tripled after adsorption with Cu(II) from 50 pN to 140 pN. The stiffness of the TOCNF was also enhanced because the Cu(II) bound to the carboxylate groups and hardened the fiber. AFM topography, scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) mapping and X-ray photoelectron spectroscopy (XPS) indicated that the TOCNF were covered by copper nanolayers and/or nanoparticles after adsorption. The changes in the molecular structure caused by the adsorption were demonstrated by Raman and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). This methodology will be of great assistance to gain qualitative and quantitative information on the adsorption process and interaction between charged entities in aqueous medium.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017
National Category
Other Physics Topics Bio Materials
Research subject
Experimental Physics; Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-63514 (URN)10.1039/c7nr01566f (DOI)000402881600009 ()28530277 (PubMedID)2-s2.0-85021169078 (Scopus ID)
Note

Validerad;2017;Nivå 2;2017-06-14 (rokbeg)

Available from: 2017-05-24 Created: 2017-05-24 Last updated: 2018-07-10Bibliographically approved
Botella, P., Devaux, X., Dossot, M., Garashchenko, V., Beltzung, J. C., Soldatov, A. & Ananev, S. (2017). Single-Walled Carbon Nanotubes Shock-Compressed to 0.5 Mbar. Physica status solidi. B, Basic research, 254(11), Article ID 1770259.
Open this publication in new window or tab >>Single-Walled Carbon Nanotubes Shock-Compressed to 0.5 Mbar
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2017 (English)In: Physica status solidi. B, Basic research, ISSN 0370-1972, E-ISSN 1521-3951, Vol. 254, no 11, article id 1770259Article in journal (Refereed) Published
Abstract [en]

Single-walled carbon nanotubes (SWCNTs) have been dynamically (shock) compressed to 0.5 Mbar, above the limit of their structural integrity. Two distinct types of material are identified by high-resolution transmission electron microscopy (HRTEM) and multi-wavelength Raman spectroscopy in the sample recovered after shock: multi-layer graphene (MLG) and a two-phase material composed of nano-clustered graphene and amorphous carbon whereas no diamond-like carbon or carbon nano-onions are found. Peak decomposition of the Raman spectra was used to estimate the coherent scatterers (clusters) size in MLG at 36 nm from the D- to G-band intensity ratio dependence on the photon excitation energy. Botella et al. (article no. 1700315) propose the peak fitting model for decomposition of the Raman spectra of highly disordered carbon material containing graphene nano-clusters and stress the importance of accounting for heptagonal- and pentagonal-ring defects in graphene layers for the analysis of such spectra. The cover image shows HRTEM images and the correspondent Raman spectra of the two types of material along with peak decomposition of the two-phase material with the peaks assigned to heptagons (a) and pentagons (b). Particulars of the SWCNTs transformation to other structural forms of carbon at high pressure/temperature are discussed

Place, publisher, year, edition, pages
John Wiley & Sons, 2017
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-66624 (URN)10.1002/pssb.201770259 (DOI)000417609800010 ()
Available from: 2017-11-17 Created: 2017-11-17 Last updated: 2018-04-26Bibliographically approved
Botella, P., Devaux, X., Dossot, M., Garashchenko, V., Beltzung, J. C., Soldatov, A. & Ananev, S. (2017). Single-Walled Carbon Nanotubes Shock-Compressed to 0.5 Mbar. Physica status solidi. B, Basic research, 254(11), Article ID 1700315.
Open this publication in new window or tab >>Single-Walled Carbon Nanotubes Shock-Compressed to 0.5 Mbar
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2017 (English)In: Physica status solidi. B, Basic research, ISSN 0370-1972, E-ISSN 1521-3951, Vol. 254, no 11, article id 1700315Article in journal (Refereed) Published
Abstract [en]

Single-walled carbon nanotubes (SWCNTs) have been dynamically (shock) compressed to 0.5 Mbar, above the limit of their structural integrity. Two distinct types of material are identified by high-resolution transmission electron microscopy (HRTEM) and multi-wavelength Raman spectroscopy in the sample recovered after shock: multi-layer graphene (MLG) and a two-phase material composed of nano-clustered graphene and amorphous carbon whereas no diamond-like carbon or carbon nano-onions are found. Peak decomposition of the Raman spectra was used to estimate the coherent scatterers (clusters) size in MLG at 36 nm from the D- to G-band intensity ratio dependence on the photon excitation energy. Botella et al. (article no. 1700315) propose the peak fitting model for decomposition of the Raman spectra of highly disordered carbon material containing graphene nano-clusters and stress the importance of accounting for heptagonal- and pentagonal-ring defects in graphene layers for the analysis of such spectra. The cover image shows HRTEM images and the correspondent Raman spectra of the two types of material along with peak decomposition of the two-phase material with the peaks assigned to heptagons (a) and pentagons (b). Particulars of the SWCNTs transformation to other structural forms of carbon at high pressure/temperature are discussed

Place, publisher, year, edition, pages
John Wiley & Sons, 2017
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-68344 (URN)10.1002/pssb.201700315 (DOI)
Note

Validerad;2017;Nivå 2;2017-11-21 (andbra)

Available from: 2018-04-13 Created: 2018-04-13 Last updated: 2018-05-04Bibliographically approved
Öberg, S., Adjizian, J.-J., Erbahar, D., Rio, J., Humbert, B., Dossot, M., . . . Ewels, C. P. (2016). Effect of functionalization and charging on resonance energy and radial breathing modes of metallic carbon nanotubes (ed.). Paper presented at . Physical Review B. Condensed Matter and Materials Physics, 93(4), Article ID 45408.
Open this publication in new window or tab >>Effect of functionalization and charging on resonance energy and radial breathing modes of metallic carbon nanotubes
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2016 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 93, no 4, article id 45408Article in journal (Refereed) Published
Abstract [en]

While changes in resonant Raman scattering measurements are commonly used to measure the effect of chemical functionalization on single-walled carbon nanotubes, the precise effects of functionalization on these spectra have yet to be clearly identified. In this density functional theory study, we explore the effects of functionalization on both the nanotube resonance energy and frequency shifts in radial breathing mode. Charge transfer effects cause a shift in the first Van Hove singularity spacings, and hence resonance excitation energy, and lead to a decrease in the radial breathing mode frequency, notably when the Fermi level decreases. By varying stochastically the effective mass of carbon atoms in the tube, we simulate the mass effect of functionalization on breathing mode frequency. Finally, full density functional calculations are performed for different nanotubes with varying functional group distribution and concentration using fluorination and hydrogenation, allowing us to determine overall effect on radial breathing mode and charge transfer. The results concur well with experiment, and we discuss the importance when using Raman spectroscopy to interpret experimental functionalization treatments

National Category
Other Physics Topics
Research subject
Tillämpad fysik; Experimental physics
Identifiers
urn:nbn:se:ltu:diva-11347 (URN)10.1103/PhysRevB.93.045408 (DOI)000367894400008 ()2-s2.0-84955455581 (Scopus ID)a4afae03-a703-44c1-aba6-e770cff97d90 (Local ID)a4afae03-a703-44c1-aba6-e770cff97d90 (Archive number)a4afae03-a703-44c1-aba6-e770cff97d90 (OAI)
Note
Validerad; 2016; Nivå 2; 20160129 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Chernogorova, O. P., Drozdova, E. I., Ushakova, I. N., Bulychev, S., Ekimov, E., Benavides, V. & Soldatov, A. (2016). Indentation behaviour of superelastic hard carbon. Philosophical Magazine, 96(32-34), 3451-3460
Open this publication in new window or tab >>Indentation behaviour of superelastic hard carbon
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2016 (English)In: Philosophical Magazine, ISSN 1478-6435, E-ISSN 1478-6443, Vol. 96, no 32-34, p. 3451-3460Article in journal (Refereed) Published
Abstract [en]

Superelastic hard carbon particles widely varying in structure andproperties have been studied by instrumented microindentationtechnique. The carbon particles up to 200 μm in size were producedby fullerene collapse upon high-pressure high-temperature treatmentof metal–fullerene powder mixture with simultaneous sintering ofmetal matrix composite materials (CM) reinforced by the particles.The structure and properties of the carbon particles were controlledby changing synthesis parameters and the state (composition andstructure) of the parent fullerite crystals. The specific features of theinstrumented indentation behaviour of the particles were studied asa function of their hardness. Mechanical properties of the particlestested at loads of up to 1970 mN exhibit an indentation size effect,which becomes more pronounced with increasing hardness of thecarbon particles. Upon holding at a constant load, the fullerenederivedcarbon particles undergo unrecoverable deformation, and theindentation creep CIT increases with increasing particle hardness. Anincrease in hardness of the reinforcing carbon particles substantiallyimproves the wear resistance of the CM and decreases their frictioncoefficient.

National Category
Other Physics Topics
Research subject
Experimental physics
Identifiers
urn:nbn:se:ltu:diva-59920 (URN)10.1080/14786435.2016.1235802 (DOI)000388738500010 ()2-s2.0-84991278469 (Scopus ID)
Note

Validerad; 2016; Nivå 2; 2016-11-21(andbra)

Available from: 2016-10-24 Created: 2016-10-24 Last updated: 2018-07-10Bibliographically approved
Battie, Y., Dossot, M., Allali, N., Mamane, V., Naciri, A. ., Broch, L. & Soldatov, A. (2016). Mild covalent functionalization of single-walled carbon nanotubes highlighted by spectroscopic ellipsometry (ed.). Paper presented at . Carbon, 96, 557-564
Open this publication in new window or tab >>Mild covalent functionalization of single-walled carbon nanotubes highlighted by spectroscopic ellipsometry
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2016 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 96, p. 557-564Article in journal (Refereed) Published
Abstract [en]

Single-walled carbon nanotubes (SWCNT) synthesized using the HiPco® process and purified thereafter were submitted to two covalent functionalization processes: i) a mild oxidation in a concentrated HNO3 solution using microwave irradiation and ii) a radical functionalization to graft methoxyphenyl groups. The samples were analyzed by Raman spectroscopy and spectroscopic ellipsometry in the energy window 0.07-4.96 eV. The complex dielectric function was analytically calculated in order to extract the real (εr) and imaginary (εi) parts of this function vs. the incident energy of the light. The ellipsometric data in the infrared part of the spectrum revealed that process i) mainly affected the amorphous carbon deposited on the surface of SWCNTs while process ii) strongly changed the electronic nature of the film due to a charge transfer between methoxyphenyl groups and SWCNTs. These results demonstrate the richness of information that spectroscopic ellipsometry is able to bring about on an entire carbon nanotube ensemble compared to Raman spectroscopy, while not suffering from limitation on their electronic structure and/or aggregate state/presence of surfactants.

National Category
Other Physics Topics
Research subject
Experimental physics
Identifiers
urn:nbn:se:ltu:diva-12813 (URN)10.1016/j.carbon.2015.09.066 (DOI)000366078000066 ()2-s2.0-84947998139 (Scopus ID)bf80e084-3972-4c26-b41f-6d06d022ddcc (Local ID)bf80e084-3972-4c26-b41f-6d06d022ddcc (Archive number)bf80e084-3972-4c26-b41f-6d06d022ddcc (OAI)
Note
Validerad; 2016; Nivå 2; 20151002 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Devaux, X., Vigolo, B., McRae, E., Valsaque, F., Allali, N., Mamane, V., . . . Tsareva, S. Y. (2015). Covalent Functionalization of HiPco Single-Walled Carbon Nanotubes: Differences in the Oxidizing Action of H2SO4 and HNO3 during a Soft Oxidation Process (ed.). Paper presented at . ChemPhysChem, 16(12), 2692-2701
Open this publication in new window or tab >>Covalent Functionalization of HiPco Single-Walled Carbon Nanotubes: Differences in the Oxidizing Action of H2SO4 and HNO3 during a Soft Oxidation Process
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2015 (English)In: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 16, no 12, p. 2692-2701Article in journal (Refereed) Published
Abstract [en]

The results of a study on the evolution of HiPco single-walled carbon nanotubes during the oxidizing action of H2SO4 and HNO3 are presented. The process conditions used have been chosen so as to avoid any significant damage to the nanotube structure. The type and level of functionalization, the location of the grafted functions on the surface of the nanotube and the changes in morphological characteristics of the samples were examined by using a wide and complementary range of analytical techniques. We propose an explanation for the differences in the oxidizing action of sulfuric and nitric acids. The combined results allow us to suggest possible reaction mechanisms that occur on the surface of the nanotube.

National Category
Other Physics Topics
Research subject
Experimental physics
Identifiers
urn:nbn:se:ltu:diva-7362 (URN)10.1002/cphc.201500248 (DOI)000359906900026 ()26136373 (PubMedID)2-s2.0-84939252266 (Scopus ID)5bc47731-9547-4a86-99ba-8d3283d0a889 (Local ID)5bc47731-9547-4a86-99ba-8d3283d0a889 (Archive number)5bc47731-9547-4a86-99ba-8d3283d0a889 (OAI)
Note
Validerad; 2015; Nivå 2; 20150703 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Benavides, V., Chernogorova, O., Drozdova, E. I., Ushakova, I. N. & Soldatov, A. (2015). Raman and electron microscopy study of C60 collapse/transformation to a nanoclustered graphene-based disordered carbon phase at high pressure/temperature (ed.). Paper presented at . Physica status solidi. B, Basic research, 252(11), 2626-2629
Open this publication in new window or tab >>Raman and electron microscopy study of C60 collapse/transformation to a nanoclustered graphene-based disordered carbon phase at high pressure/temperature
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2015 (English)In: Physica status solidi. B, Basic research, ISSN 0370-1972, E-ISSN 1521-3951, Vol. 252, no 11, p. 2626-2629Article in journal (Refereed) Published
Abstract [en]

Transformation of C60 polymers to a superelastic hard carbon (nanoclustered graphene phase (NGP)) occurring in metal matrix at 5 GPa in a temperature interval of 1000–1100 K was studied by optical, scanning electron microscopy (SEM), and Raman spectroscopy. Raman spectral scan across the sample surface allowed us to identify different stages of the structural transformation. The SEM and Raman spectroscopy data testify for the NGP appearance at the defects concentration sites in the parent fullerite structure. We propose that the buckyballs collapse/formation of the NGP is governed by nucleation and growth (diffusive) mechanism unlike earlier discussed in the literature possibility of the martensitic-type (displacive) character of this transformation.

National Category
Other Physics Topics
Research subject
Experimental physics
Identifiers
urn:nbn:se:ltu:diva-6977 (URN)10.1002/pssb.201552665 (DOI)000364690400046 ()2-s2.0-84946434200 (Scopus ID)54debcfd-13d4-4b81-a6a0-24a4447f86f0 (Local ID)54debcfd-13d4-4b81-a6a0-24a4447f86f0 (Archive number)54debcfd-13d4-4b81-a6a0-24a4447f86f0 (OAI)
Note
Validerad; 2015; Nivå 2; 20151027 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Noël, M., Ananev, S., Mases, M., Devaux, X., Lee, J., Evdokimov, I., . . . Soldatov, A. (2014). Probing structural integrity of single walled carbon nanotubes by dynamic and static compression (ed.). Paper presented at . Physica Status Solidi. Rapid Research Letters, 8(11), 935-938, Article ID 4.
Open this publication in new window or tab >>Probing structural integrity of single walled carbon nanotubes by dynamic and static compression
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2014 (English)In: Physica Status Solidi. Rapid Research Letters, ISSN 1862-6254, E-ISSN 1862-6270, Vol. 8, no 11, p. 935-938, article id 4Article in journal (Refereed) Published
Abstract [en]

We report on a first study of single walled carbon nanotubes (SWCNTs) after application of dynamic (shock) compression. The experiments were conducted at 19 GPa and 36 GPa in a recovery assembly. For comparison, an experiment at a static pressure of 36 GPa was performed on the material from the same batch in a diamond anvil cell (DAC). After the high pressure treatment the samples were characterized by Raman spectroscopy and transmission electron microscopy (TEM). After exposure to 19 GPa of shock compression the CNT material exhibited substantial structural damage such as CNT wall disruption, opening of the tube along its axis (“unzipping”) and tube shortening (“cutting”). Dynamic compression to 36 GPa resulted in essentially complete CNT destruction whereas at least a fraction of the nanotubes was recovered after 36 GPa of static compression though severely damaged. The results of these shock wave experiments underline the prospect of using SWCNTs as reinforcing units in material

National Category
Other Physics Topics
Research subject
Experimental physics
Identifiers
urn:nbn:se:ltu:diva-2389 (URN)10.1002/pssr.201409353 (DOI)000345274300010 ()2-s2.0-84910679063 (Scopus ID)00027906-f0eb-4cda-9952-cad4e7041d92 (Local ID)00027906-f0eb-4cda-9952-cad4e7041d92 (Archive number)00027906-f0eb-4cda-9952-cad4e7041d92 (OAI)
Note
Validerad; 2014; 20140912 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Chernogorova, O., Potapova, I., Drozdova, E., Sirotinkin, V., Soldatov, A., Vasiliev, A. & Ekimov, E. (2014). Structure and physical properties of nanoclustered graphene synthesized from C-60 fullerene under high pressure and high temperature (ed.). Paper presented at . Applied Physics Letters, 104(4), Article ID 43110.
Open this publication in new window or tab >>Structure and physical properties of nanoclustered graphene synthesized from C-60 fullerene under high pressure and high temperature
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2014 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 104, no 4, article id 43110Article in journal (Refereed) Published
Abstract [en]

C-60 treatment at 5-8 GPa, similar to 1000 degrees C results in the fullerene cage collapse and transformation to a phase with outstanding mechanical properties. A detailed structural analysis of the phase reveals that it comprised 7-12 layer graphene clusters with lateral dimension of 2-4 nm. Raman spectra of the nanoclustered graphene phase are similar to those of disordered sp(2) carbon structure with an admixture of sp(3)-bonded carbon. The phase is characterized by a high (up to 19 GPa) hardness, relatively low (about 70 GPa) Young modulus and up to 95% elastic recovery, determining excellent wear resistance and good antifriction properties. (C) 2014 AIP Publishing LLC.

National Category
Other Physics Topics
Research subject
Experimental physics
Identifiers
urn:nbn:se:ltu:diva-13301 (URN)10.1063/1.4863470 (DOI)000331209900071 ()2-s2.0-84919622356 (Scopus ID)c7f18660-6bf9-41c9-bfe7-bc6f4653696b (Local ID)c7f18660-6bf9-41c9-bfe7-bc6f4653696b (Archive number)c7f18660-6bf9-41c9-bfe7-bc6f4653696b (OAI)
Note
Validerad; 2014; 20140320 (johsod)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-5145-1560

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