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Simon J L Billinge - One of the best experts on this subject based on the ideXlab platform.

  • Structure of nanocrystalline ti 3 c 2 mxene using atomic pair distribution function
    Physical Review Letters, 2014
    Co-Authors: Chenyang Shi, Simon J L Billinge, Majid Beidaghi, Michael Naguib, Olha Mashtalir, Yury Gogotsi
    Abstract:

    The Structures of nanocrystalline pristine, potassium hydroxide and sodium acetate intercalated new two-dimensional materials ${\mathrm{Ti}}_{3}{\mathrm{C}}_{2}$ MXenes were studied using the x-ray atomic pair distribution function technique. Pristine MXene has a Hexagonal Structure with $a=b=3.0505(5)\text{ }\text{ }\AA{}$, $c=19.86(2)\text{ }\text{ }\AA{}$ (S.G. $P{6}_{3}/mmc$ No. 194). Both hydroxyl and fluoride terminating species are present. The intercalation of ${\mathrm{K}}^{+}$ or ${\mathrm{Na}}^{+}$ ions expands the ${\mathrm{Ti}}_{3}{\mathrm{C}}_{2}$ layers perpendicular to the planes but shrinks the in-plane $a$ and $b$ lattice parameters.

  • Structure of nanocrystalline ti 3 c 2 mxene using atomic pair distribution function
    Physical Review Letters, 2014
    Co-Authors: Chenyang Shi, Majid Beidaghi, Michael Naguib, Olha Mashtalir, Yury Gogotsi, Simon J L Billinge
    Abstract:

    The Structures of nanocrystalline pristine, potassium hydroxide and sodium acetate intercalated new two-dimensional materials Ti3C2 MXenes were studied using the x-ray atomic pair distribution function technique. Pristine MXene has a Hexagonal Structure with a=b=3.0505(5)  A, c=19.86(2)  A (S.G. P63/mmc No. 194). Both hydroxyl and fluoride terminating species are present. The intercalation of K+ or Na+ ions expands the Ti3C2 layers perpendicular to the planes but shrinks the in-plane a and b lattice parameters.

Deqing Liang - One of the best experts on this subject based on the ideXlab platform.

  • investigation of kinetics of tetrabutylammonium chloride tbac ch4 semiclathrate hydrate formation
    RSC Advances, 2017
    Co-Authors: Lingli Shi, Deqing Liang
    Abstract:

    For potential application in advanced gas storage at moderate temperatures, a systematic study on tetrabutylammonium chloride (TBAC) + CH4 semiclathrate hydrate formation kinetics was conducted using isobaric kinetics measurements to evaluate the effects of pressure (6.0, 3.0 MPa), temperature (278 K, subcooling degree of 6 K), and salt concentration (0.10, 0.20, 0.30, 0.34, 0.45 mass fraction). The results revealed that the systems showed shorter induction time, higher normalized gas consumption and higher rapid growth rate under a higher supersaturation environment, represented by higher pressure or lower temperature. Besides, the effect of salt concentration was complicated. With the increase of salt concentration, the total gas consumption was almost the same while the normalized gas consumption decreased greatly, indicating that the amount of CH4 trapped in the hydrate unit greatly decreased and the system with low salt concentration was a good choice for advanced gas storage. In addition, a Raman device was employed to reveal the structural properties. The spectra showed that the (TBAC + CH4) semiclathrate hydrates were formed with Hexagonal Structure or tetragonal Structure under different salt concentrations, which were different from the Structures of pure TBAC hydrate. It was assumed that at low salt concentrations the addition of CH4 induced the formation of Hexagonal Structure since it had three 512 cages per TBAC which was higher than that of the tetragonal Structure.

Lingli Shi - One of the best experts on this subject based on the ideXlab platform.

  • investigation of kinetics of tetrabutylammonium chloride tbac ch4 semiclathrate hydrate formation
    RSC Advances, 2017
    Co-Authors: Lingli Shi, Deqing Liang
    Abstract:

    For potential application in advanced gas storage at moderate temperatures, a systematic study on tetrabutylammonium chloride (TBAC) + CH4 semiclathrate hydrate formation kinetics was conducted using isobaric kinetics measurements to evaluate the effects of pressure (6.0, 3.0 MPa), temperature (278 K, subcooling degree of 6 K), and salt concentration (0.10, 0.20, 0.30, 0.34, 0.45 mass fraction). The results revealed that the systems showed shorter induction time, higher normalized gas consumption and higher rapid growth rate under a higher supersaturation environment, represented by higher pressure or lower temperature. Besides, the effect of salt concentration was complicated. With the increase of salt concentration, the total gas consumption was almost the same while the normalized gas consumption decreased greatly, indicating that the amount of CH4 trapped in the hydrate unit greatly decreased and the system with low salt concentration was a good choice for advanced gas storage. In addition, a Raman device was employed to reveal the structural properties. The spectra showed that the (TBAC + CH4) semiclathrate hydrates were formed with Hexagonal Structure or tetragonal Structure under different salt concentrations, which were different from the Structures of pure TBAC hydrate. It was assumed that at low salt concentrations the addition of CH4 induced the formation of Hexagonal Structure since it had three 512 cages per TBAC which was higher than that of the tetragonal Structure.

Chenyang Shi - One of the best experts on this subject based on the ideXlab platform.

  • Structure of nanocrystalline ti 3 c 2 mxene using atomic pair distribution function
    Physical Review Letters, 2014
    Co-Authors: Chenyang Shi, Simon J L Billinge, Majid Beidaghi, Michael Naguib, Olha Mashtalir, Yury Gogotsi
    Abstract:

    The Structures of nanocrystalline pristine, potassium hydroxide and sodium acetate intercalated new two-dimensional materials ${\mathrm{Ti}}_{3}{\mathrm{C}}_{2}$ MXenes were studied using the x-ray atomic pair distribution function technique. Pristine MXene has a Hexagonal Structure with $a=b=3.0505(5)\text{ }\text{ }\AA{}$, $c=19.86(2)\text{ }\text{ }\AA{}$ (S.G. $P{6}_{3}/mmc$ No. 194). Both hydroxyl and fluoride terminating species are present. The intercalation of ${\mathrm{K}}^{+}$ or ${\mathrm{Na}}^{+}$ ions expands the ${\mathrm{Ti}}_{3}{\mathrm{C}}_{2}$ layers perpendicular to the planes but shrinks the in-plane $a$ and $b$ lattice parameters.

  • Structure of nanocrystalline ti 3 c 2 mxene using atomic pair distribution function
    Physical Review Letters, 2014
    Co-Authors: Chenyang Shi, Majid Beidaghi, Michael Naguib, Olha Mashtalir, Yury Gogotsi, Simon J L Billinge
    Abstract:

    The Structures of nanocrystalline pristine, potassium hydroxide and sodium acetate intercalated new two-dimensional materials Ti3C2 MXenes were studied using the x-ray atomic pair distribution function technique. Pristine MXene has a Hexagonal Structure with a=b=3.0505(5)  A, c=19.86(2)  A (S.G. P63/mmc No. 194). Both hydroxyl and fluoride terminating species are present. The intercalation of K+ or Na+ ions expands the Ti3C2 layers perpendicular to the planes but shrinks the in-plane a and b lattice parameters.

Bernard Raveau - One of the best experts on this subject based on the ideXlab platform.

  • oxygen excess in the 114 cobaltite Hexagonal Structure the ferrimagnet cabaco4o7 50
    ChemInform, 2011
    Co-Authors: Valerie Pralong, V Caignaert, Tapati Sarkar, O I Lebedev, Victor Duffort, Bernard Raveau
    Abstract:

    The title compound is obtained by oxidation of CaBaCo4O7 either electrochemically in alkaline medium or by reaction with an aqueous solution of NaClO.

  • oxygen excess in the 114 cobaltite Hexagonal Structure the ferrimagnet cabaco4o7 50
    Journal of Solid State Chemistry, 2011
    Co-Authors: Valerie Pralong, V Caignaert, Tapati Sarkar, O I Lebedev, Victor Duffort, Bernard Raveau
    Abstract:

    Abstract The study of the oxidation of the “114” orthorhombic cobaltite CaBaCo4O7, using first electrochemistry and then soft chemistry based on oxidation by NaClO, has allowed a new phase, CaBaCo4O7.50, to be prepared topotactically. The structural study of this phase shows that its Hexagonal Structure, closely related to that of orthorhombic CaBaCo4O7, is curiously similar to that of the members of the LnBaCo4O7 series, in spite of its excess oxygen. Its magnetic study shows that this phase, like CaBaCo4O7, is ferrimagnetic with the same TC (60 K), but differently exhibits an unusual magnetic hysteresis. This exceptional behavior of CaBaCo4O7 with respect to oxidation as well as the magnetic properties of CaBaCo4O7.50 is interpreted in terms of the presence of defects due to oxidation.