Localisation and Characterization by TEM and EELS of Man-ganese Species during Graft Copolymerization of Acrylic Acid onto Sawdust Using KMnO4 as Initiator

Marchetti, V.; Ghanbaja, Jaâfar; Gérardin, Philippe; Loubinoux, B.

doi:10.1515/hf.2000.093

Cited by 5 publications

(7 citation statements)

References 7 publications

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“…Oligo esterification method was used to activate pine wood blocks with maleic anhydride along with allylglycidyl ether, in order to graft hydride-terminated polydimethylsiloxane and bis (trimethylsiloxy) methylsilane [80]. Firstly, the absorbency of cellulose fibers was improved by activating the surface with an ethoxysilane and then by doing copolymerization of acrylic acid onto the surface, initiated by potassium persulfate [57, 123–134]. In comparison with the number of studies for graft copolymerization onto cellulose, research on the copolymerization onto more complex substances like wood and plant fiber is scarce.…”

Section: Modification Of Natural Fibersmentioning

confidence: 99%

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Hydrophobic treatment of natural fibers and their composites—A review

Ali

Shaker

Nawab

et al. 2016

Journal of Industrial Textiles

375

176

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There is a growing interest in the development of natural fiber-reinforced composites, most likely due to their wide availability, low cost, environment friendliness, and sustainability. The market size for natural fiber-reinforced composites is projected to reach $5.83 billion by 2019, with a compound annual growth rate of 12.3%. The composite materials reinforced with wood, cotton, jute, flax or other natural fibers fall under this category. Meanwhile, some major factors limiting the large scale production of natural fiber composites include the tendency of natural fiber to absorb water, degradation by microorganisms and sunlight and ultimately low strength and service life. This paper has focused to review the different natural fiber treatments used to reduce the moisture absorption and fiber degradation. The effect of these treatments on the mechanical properties of these composites has also been summarized.

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Section: Modification Of Natural Fibersmentioning

confidence: 99%

“…Marchetti et al. reported the deposition of manganese dioxide (MnO 2 ) on the wood cell wall when KMnO 4 was used as an initiator, which contributed to the radical chain transfer onto wood [130]. Ghosh et al.…”

Section: Modification Of Natural Fibersmentioning

confidence: 99%

Hydrophobic treatment of natural fibers and their composites—A review

Ali

Shaker

Nawab

et al. 2016

Journal of Industrial Textiles

375

176

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“…The positions of the Mn L 2,3 edges are known to be related to the Mn oxidation state. 9,[15][16][17][18][19][20] In Fig. 3 we show representative EELS spectra of 3.…”

Section: Fig 1 ͑Color Online͒ ͑A͒mentioning

confidence: 99%

Cationic and charge segregation in La2/3Ca1/3MnO3 thin films grown on (001) and (110) SrTiO3

Estradé

Arbiol

Peiró

et al. 2008

Applied Physics Letters

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Electron energy-loss spectroscopy is used to map composition and electronic states in epitaxial La 2/3 Ca 1/3 MnO 3 films grown on SrTiO 3 ͑001͒ and ͑110͒ substrates. It is found that in partially relaxed ͑110͒ films cationic composition and valence state of Mn 3+/4+ ions are preserved across the film thickness. In contrast, in fully strained ͑001͒ films, the Ca/La ratio gradually changes across the film, being La rich at film/substrate interface and La depleted at free surface; Mn valence state changes accordingly. These observations suggest that a strongly orientation-dependent adaptative composition mechanism dominates stress accommodation in manganite films and provides microscopic understanding of their dissimilar magnetic properties. ͒ / STO/ LSMO system but found a weak decrease in the Mn valence near the interfaces, attributed to a transfer of electrons from STO to LSMO. It has been observed that in LCMO films grown on LaAlO 3 substrates, which are under compressive strain, the La 3+ ions migrate toward the top layer surface. 9 Little attention was received, so far, by the chemistry and electronic structure of ͑110͒ LCMO films, reported to display enhanced magnetic properties when compared to their ͑001͒ counterparts. 10,11 In this work, we report detailed transmission electron microscopy ͑TEM͒ and EELS analyses of epitaxial LCMO layers grown simultaneously on ͑001͒ and ͑110͒ STO substrates.The ͑001͒ and ͑110͒ LCMO layers were grown by rf sputtering at 800°C, at 330 mtorr, with an O 2 / Ar pressure ratio of 1 4 and a growth rate of ϳ0.4 nm/ min. After growth, in situ annealing was performed at 800°C for 1 h in O 2 atmosphere at 350 torr. 10 The magnetic properties of these films have been previously studied. 10,11 both magnetization ͓Fig. 1͑a͔͒ and Curie temperature of the ͑110͒ films are much larger than those of their ͑001͒ counterparts. LCMO films, when grown on ͑001͒ and ͑110͒ STO substrates, have identical ͑tensile͒ lattice mismatch ͑ϳ1.1%͒. However, whereas in-plane orthogonal directions ͓100͔ and ͓010͔ of ͑001͒ films are equivalent, ͓001͔ and ͓110͔ directions are not equivalent a͒ Electronic mail: sestrade@el.ub.es.FIG. 1. ͑Color online͒ ͑a͒ Magnetization vs field curves in the −1 -20 kOe range for ͑001͒ LCMO ͑squares͒ and ͑110͒ LCMO ͑triangles͒ 80 nm films measured at 10 K. Magnetic field was applied in-plane of the samples, being parallel to ͓100͔ direction for the ͑001͒ films and to ͓001͔ direction for the ͑110͒ film. Inset: Normalized XRR spectra from ͑001͒ ͑squares͒ and ͑110͒ ͑triangles͒ 85 nm films. ͑b͒ g = ͑1-10͒ and ͑c͒ g = ͑011͒ two beam images of ͓110͔ LCMO/STO in PV geometry.

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“…The experimental results are illustrated in Fig. 3 in comparison with the theoretical values found in literature [13][14][15] for the Mn oxidation states of 2+, 3+, and 4+. The most relevant feature in Fig.…”

mentioning

confidence: 66%

“…[10][11][12][13][14][15] In our case, the measurements of peak edge and Mn L 3 / Mn L 2 peak intensity ratio were determined using aforementioned homemade program "MANGANTAS." The experimental results are illustrated in Fig.…”

mentioning

confidence: 99%

Cationic diffusion in La2∕3Ca1∕3MnO3 thin films grown on LaAlO3 (001) substrates

Estradé

Arbiol

Peiró

et al. 2007

Applied Physics Letters

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Microstructural features of La2∕3Ca1∕3MnO3 layers of various thicknesses grown on top of (001) LaAlO3 substrates are studied by using transmission electron microscopy and electron energy loss spectroscopy. Films are of high microstructural quality but exhibit some structural relaxation and mosaicity both when increasing thickness or after annealing processes. The existence of a cationic segregation process of La atoms toward free surface has been detected, as well as a Mn oxidation state variation through layer thickness. La diffusion would lead to a Mn valence change and, in turn, to reduced magnetization.

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Localisation and Characterization by TEM and EELS of Man-ganese Species during Graft Copolymerization of Acrylic Acid onto Sawdust Using KMnO4 as Initiator

Cited by 5 publications

References 7 publications

Hydrophobic treatment of natural fibers and their composites—A review

Hydrophobic treatment of natural fibers and their composites—A review

Cationic and charge segregation in La2/3Ca1/3MnO3 thin films grown on (001) and (110) SrTiO3

Cationic diffusion in La2∕3Ca1∕3MnO3 thin films grown on LaAlO3 (001) substrates

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