The DOI matches its Crossref record; 16 of the 16 references it cites were found in a registry or an index.
Intercalation of Organic Ammonium Ions into Layered Graphite Oxide
Abstract
The intercalation of large organic ammonium ions (tetramethylammonium ions (TMA + ), tetraethylammonium ions (TEA + ), tetrapropylammonium ions (TPA + ), and tetrabutylammonium ions (TBA + )) into layered graphite oxide (GO) was systematically investigated. The intercalation reactions were completed at 25 °C after 3 days, and stable colloidal suspensions were obtained at TAA l /H s = 5 (molar ratio of tetraalkylammonium ions (TAA + ) over exchangeable protons in GO). The sediments after centrifuging the colloidal suspensions showed amorphous phase X-ray diffraction patterns, indicating that exfoliation of the layered structure into nanosheets took place in the suspension. When the sediments were dried at 70 °C for 3 days, layered structures of TAA + -intercalated GO materials with basal spacings of 1.56, 1.67, 1.84, and 2.37 nm, respectively, appeared. The basal spacing of the layered compounds decreased with a decrease of relative humidity during drying. When the dried TAA + -intercalated GO compounds were exposed to a humid saturated atmosphere, the basal spacing increased gradually, finally becoming an amorphous structure. The maximum saturation of intercalated TAA + ions into GO decreased with the increase in alkyl chain length. When the TAA + -intercalated materials were washed with distilled water and acid-treated, a process of deintercalation of TAA + ions from the interlayer occurred. A schematic model for the deintercalation−intercalation involving a exfoliation process is proposed. The layered structure of TAA + -intercalated GO materials is discussed in terms of the dimension of the GO layer and the sizes of H 2 O molecules and TAA + ions.
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Metadata
- Authors
- Liu, Z.-H., Wang, Z.-M., Yang, X., & Ooi, K.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 2002-05-15
- Volume
- 18
- Issue
- 12
- Pages
- 4926-4932
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W2072028298
- Cited by
- 262
- References
- 16
- FWCI
- 2.81
- Type
- journal article
- Language
- en
- Open access
- closed
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