High temperature Raman spectroscopy of titanate nanotubes

Gajović, Andreja; Friščić, I.; Plodinec, Milivoj; Iveković, Damir

doi:10.1016/j.molstruc.2008.12.072

Cited by 73 publications

(64 citation statements)

References 61 publications

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“…The structural phase transition of titanate nanotube skeleton was expected in this temperature range, as indicated by TG and DSC measurements (not shown), as well as by our earlier investigation [14]. appeared, and could be assigned to the sodium trititanate [28].…”

Section: In Situ High Temperature Vibrational Spectroscopysupporting

confidence: 74%

“…With the aim to verify the APMTS grafting on the surface of TiNT, the Raman spectra of the APTMS-grafted samples (TiNT-NH , which are characteristic for the protonated trititanate nanotubes [14] and indicates that the sample TiNT-H have the H 2 Ti 3 O 7 structure. These bands were preserved in the sample TiNT-NH 2 -180, indicating that the grafting of APTMS molecules onto the surface of TiNT-H does not alter the crystal structure of nanotubes.…”

Section: Vibrational Spectroscopy Of Titanate Nanotubes Modified By (mentioning

confidence: 99%

“…Depending on the nature of the group X, the physical and chemical properties of the TiNT surface can be varied within a wide range and the potential field of application of TiNT can be greatly expanded. However, there are several factors that limit the technological applicability of TiNT, among which the most serious are the low resistance of TiNT towards strong mineral acids [9], instability of TiNT under the conditions of high mechanical stress [10,11], and their thermal instability [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Study of thermal stability of (3-aminopropyl)trimethoxy silane-grafted titanate nanotubes for application as nanofillers in polymers

et al. 2014

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Protonated titanate nanotubes (TiNT-H) were surface-modified with (3-aminopropyl)trimethoxy silane (APTMS) by novel method suitable for syntheses of large amounts of materials with low costs. Usage of prepared nanotubes for polymer reinforcement was studied. Since the thermal stability of nanofiller was important to preserve their functional properties, stability was studied by in situ high temperature measurements. The most thermally stable nanotubes, silanized for 20 min, were used for preparation of epoxy-based nanocomposites. The nanofiller formed smaller (few hundreds of nm) and larger (few μm) aggregates in polymer matrix, and the amount of aggregates increased with increasing nanofiller content. APTMS modified titanate nanotubes bonded well with the epoxy matrix since amine groups on the TiNTs surface can react with epoxy group to form covalent bonds between the matrix and the nanofiller. Very small addition (0.19 -1.52 wt%) of nanotubes significantly increased the glass transition temperature and the modulus in rubbery state of the epoxy based polymer. Smaller nanofiller content lead to larger increase in these parameters and therefore better dynamic mechanical properties due to the smaller amount of large aggregates. APTMS-modified titanate nanotubes were proven as promising nanofiller in epoxy based nanocomposites.

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Section: In Situ High Temperature Vibrational Spectroscopysupporting

confidence: 74%

Section: Vibrational Spectroscopy Of Titanate Nanotubes Modified By (mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of thermal stability of (3-aminopropyl)trimethoxy silane-grafted titanate nanotubes for application as nanofillers in polymers

et al. 2014

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“…The influence of temperature on the structure and phase transitions of titanate nanotubes [11,[27][28][29][30][31] and crystalline hydrogen trititanate [25, 27, and 32] is well understood. The thermal behavior of crystalline H 2 Ti 3 O 7 has been studied by A.…”

Section: Introductionmentioning

confidence: 99%

“…Hydrothermally synthesized, protonated titanate nanotubes transform directly into anatase TiO 2 during the heat treatment. Recently, A. Gajović et al [28] observed that after heating protonated titanate nanotubes to 800 °C and cooling the sample down to the room temperature, the nanotubes transformed predominantly into rutile TiO 2 nanoparticles, but a small amount of anatase TiO 2 nanowires was also found in the sample. No evidence for the appearance of the metastable TiO 2 (B) phase at lower temperatures was found during that study, in contrast to the findings of E. Morgano Jr. et al [29].…”

Section: Introductionmentioning

confidence: 99%

The mechanochemical stability of hydrogen titanate nanostructures

Plodinec¹,

Friščić²,

Iveković³

et al. 2010

Journal of Alloys and Compounds

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The structural stability of some nanostructured titanates was investigated in terms of their subsequent processing and possible applications. With the aim to investigate their mechanochemical stability, we applied high-energy ball milling and studied the resulting induced phase transitions. Hydrogen titanates with two different morphologies, microcrystals and nanotubes, were taken into consideration. The phase-transition sequence was studied by Raman spectroscopy and X-ray powder diffraction, while the morphology and crystal structure, on the nanoscale, were analyzed by high-resolution transmission electron microscopy. During the mechanochemical treatment of both morphologies, the phase transitions from hydrogen titanate to TiO2 anatase and subsequently to TiO2 rutile were observed. In the case of hydrogen trititanate crystals, the phase transition to anatase starts after a longer milling time than in the case of the titanate nanotubes, which is explained by the larger particle size of the crystalline powder. However, the phase transition from anatase to rutile occurred more quickly in the crystalline powder than in the case of the nanotubes.

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Highly Efficient, Irreversible and Selective Ion Exchange Property of Layered Titanate Nanostructures

Li¹,

Zhang²,

Chen³

et al. 2011

Adv Funct Materials

234

133

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Layered titanates (Na2Ti3O7·nH2O) with exchangeable sodium cations located in the interlayer have been synthesized by simple hydrothermal treatment of Ti precursor in concentrated NaOH solutions. By proper control of the synthesis conditions, different morphologies of nanofibers and nanosheets are obtained. The metastable layered structure of the titanates collapses during the ion exchange, resulting in irreversible ion exchange. Target cations (eg., Ag+, Cu2+, Pb2+ and Eu3+) are completely concentrated from water and then tightly immobilized in the interlayer which is of great significance for the removal and subsequent safe disposal of hazardous metal cations. The ion exchange of the nanosheets is much more efficient than that of the nanofibers and other inorganic ion exchangers due to the larger surface area, less stable layered structure and larger amount of interlayer water of the nanosheets. The ion exchange of the titanates is also very selective. Valence, hardness, and radius of cations are main factors affecting the selectivity. Cations trapped in the interlayer are released by an acid‐induced phase transformation of the titanate nanosheets to rutile. Then the rutile can be used as a new Ti precursor to synthesize the titanate nanostructures, resulting in a full cycle of material use. The nanosheets may find applications in the decontamination and safe disposal of radioactive and heavy metal cations and also in the collection of valuable cations from water.

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High temperature Raman spectroscopy of titanate nanotubes

Cited by 73 publications

References 61 publications

Study of thermal stability of (3-aminopropyl)trimethoxy silane-grafted titanate nanotubes for application as nanofillers in polymers

Study of thermal stability of (3-aminopropyl)trimethoxy silane-grafted titanate nanotubes for application as nanofillers in polymers

The mechanochemical stability of hydrogen titanate nanostructures

Highly Efficient, Irreversible and Selective Ion Exchange Property of Layered Titanate Nanostructures

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