An FTIR spectral investigation of the structural species found on alumina surfaces

Lee, D.H.; Condrate, R. A.

doi:10.1016/0167-577x(95)00039-9

Cited by 91 publications

(81 citation statements)

References 15 publications

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“…Neat alumina presents a small absorption at around 1630 cm −1 that can be assigned to surface species with Dawsonitelike structure which may be formed by adsorption 35 , can be used to distinguish these interactions 21 . Figure 1 reveals that Δ is approximately constant for all studied acids with a value of ∼150 cm −1 , suggesting that the representative interaction between the COO − group and the Al 3+ ion corresponds to a bridging binuclear bond.…”

Section: Chemisorption Of Long Chain Fatty Acidsmentioning

confidence: 99%

γ-Alumina Modification with Long Chain Carboxylic Acid Surface Nanocrystals for Biocompatible Polysulfone Nanocomposites

Anaya

Serrano

Herrero

et al. 2014

ACS Appl. Mater. Interfaces

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High performance polysulfone/γ-alumina biocom-patible nanocomposites are reported for the first time and the effects of γ-alumina surface modification are explored. We show that some fatty acids chemisorb over the surface of γ-alumina forming nanosized self-assembled structures. These structures present thermal transitions at high temperatures, 100 °C higher than the melting temperatures of the pure acids, and are further shifted about 50 °C in the presence of polysulfone. The chemistry involved in the chemisorption is mild and green meeting the stringent bio sanitary protocols for biocompatible devices. It has been found that the self-assembled structures increase mechanical strength by about 20% despite the foreseeable lack of strong particle−matrix interactions, which manifests as small variations in both the glass transition temperature and the Young's modulus. Electron microscopy observation of fractured surfaces has revealed that some acids induce an extended region of influence around the nanoparticles and this fact has been used to explain the enhancement of mechanical strength.

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Section: Chemisorption Of Long Chain Fatty Acidsmentioning

confidence: 99%

γ-Alumina Modification with Long Chain Carboxylic Acid Surface Nanocrystals for Biocompatible Polysulfone Nanocomposites

Anaya

Serrano

Herrero

et al. 2014

ACS Appl. Mater. Interfaces

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“…The distinctive sharp peaks observed in the spectrum of the B2 powder, have been previously assigned to a mixture of aluminum trihydroxide polymorphs bands, namely bayerite, gibbsite and norstrandite [18]. Similar bands were also detected on some as received commercial a-Al 2 O 3 produced by the Bayer process and all investigated powders after washing in distilled water, and these bands were also assigned to gibbsite/bayerite like structures [8,19].…”

Section: Resultsmentioning

confidence: 48%

Surface hydration states of commercial high purity α-Al₂O₃powders evaluated by temperature programmed desorption mass spectrometry and diffuse reflectance infrared Fourier transform spectroscopy

Shirai

Ishizaki

et al. 2005

Science and Technology of Advanced Materials

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The surface of three different grades of commercial high-purity a-Al 2 O 3 powders produced by hydrolysis of aluminum alkoxide, which differ each other in SSA are evaluated by temperature programmed desorption mass spectrometry (TPDMS) and diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. For the DRIFT evaluation the powders were heated in situ under vacuum from 25 to 700 8C. The TPDMS spectra of desorbed H 2 O were obtained by heating the samples under ultra high vacuum at a rate of 20 K min K1 up to 1200 8C.The presence of hydrogen bonded water molecules, amorphous Al(OH) 3 and AlOOH structures, as well as associated and isolated hydroxyl groups on the surface of all the a-Al 2 O 3 powders investigated is demonstrated. On the surface of one of the powders the presence of crystalline Al(OH) 3 structures, as evidenced by an additional sharp peak in the H 2 O TPDMS spectrum, is confirmed. q

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“…To date little Raman spectra of dawsonite has been published, even though a significant number of infrared analyses have been undertaken 15,[17][18][19][20][21] . X-ray crysatllography suggests the mineral has a regular structure.…”

Section: Introductionmentioning

confidence: 99%

“…The infrared spectra of dawsonite has been published [15][16][17][18][19][20][21] . Alumina surfaces have been analysed by FTIR spectroscopy 18 .…”

Section: Introductionmentioning

confidence: 99%

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Raman spectroscopy of dawsonite NaAl(CO₃)(OH)₂

Frost

Bouzaid

2007

J Raman Spectroscopy

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Raman spectroscopy at both 298 and 77 K complimented with infrared spectroscopy has been used to study the structure of dawsonite. Previous crystallographic studies concluded that the structure of dawsonite was a simple one, however both Raman and infrared spectroscopy show that this conclusion is incorrect. Multiple bands are observed in both the Raman and infrared spectra in the antisymmetric stretching and bending regions showing that the symmetry of the carbonate anion is reduced and in all probablity the carbonate anions are not equivalent in the dawsonite structure. Multiple OH deformation vibrations centred upon 950 cm -1 in both the Raman and infrared spectra show that the OH units in the dawsonite structure are non-equivalent. Calculations using the position of the Raman and infrared OH stretching vibrations enabled estimates of the hydrogen bond distances of 0.2735, 0.27219 pm at 298 K and 0.27315, 0.2713 pm at 77 K to be made. This indicates strong hydrogen bonding of the OH units in the dawsonite structure.

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An FTIR spectral investigation of the structural species found on alumina surfaces

Cited by 91 publications

References 15 publications

γ-Alumina Modification with Long Chain Carboxylic Acid Surface Nanocrystals for Biocompatible Polysulfone Nanocomposites

γ-Alumina Modification with Long Chain Carboxylic Acid Surface Nanocrystals for Biocompatible Polysulfone Nanocomposites

Surface hydration states of commercial high purity α-Al₂O₃powders evaluated by temperature programmed desorption mass spectrometry and diffuse reflectance infrared Fourier transform spectroscopy

Raman spectroscopy of dawsonite NaAl(CO₃)(OH)₂

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An FTIR spectral investigation of the structural species found on alumina surfaces

Cited by 91 publications

References 15 publications

γ-Alumina Modification with Long Chain Carboxylic Acid Surface Nanocrystals for Biocompatible Polysulfone Nanocomposites

γ-Alumina Modification with Long Chain Carboxylic Acid Surface Nanocrystals for Biocompatible Polysulfone Nanocomposites

Surface hydration states of commercial high purity α-Al2O3powders evaluated by temperature programmed desorption mass spectrometry and diffuse reflectance infrared Fourier transform spectroscopy

Raman spectroscopy of dawsonite NaAl(CO3)(OH)2

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Surface hydration states of commercial high purity α-Al₂O₃powders evaluated by temperature programmed desorption mass spectrometry and diffuse reflectance infrared Fourier transform spectroscopy

Raman spectroscopy of dawsonite NaAl(CO₃)(OH)₂