Soft chemical conversion of layered double hydroxides to superparamagnetic spinel platelets

Thomas E. Mallouk; Yoji Kobayashi; Xianglin Ke; Hideo Hata; Peter Schiffer

doi:10.1021/cm703443q

Soft chemical conversion of layered double hydroxides to superparamagnetic spinel platelets

Thomas E. Mallouk, Yoji Kobayashi, Xianglin Ke, Hideo Hata, Peter Schiffer

Research output: Contribution to journal › Article › peer-review

67 Scopus citations

Abstract

We report the synthesis of a wide range of single-crystal spinel platelets with exposed (111) faces, lateral dimensions in the micrometer range, and thicknesses of 20-50 nm, prepared by soft chemical dehydration of well crystallized layered precursors. This method enables the synthesis of the metastable composition NiCoAlO₄, which cannot be prepared by conventional solid state synthesis. Because of their nanoscale thickness, mosaic structure, shape anisotropy, and surface porosity, NiCoAlO₄ and NiCo₂O₄ platelets exhibit room-temperature superparamagnetism (T_B = 40 and 250 K, respectively) despite the fact that they have micrometer-size lateral dimensions. The accessibility of a wide range of superparamagnetic spinel platelets (as opposed to cubes or spheres) should be useful for studies in ferrofluids and related composite magnetic materials.

Original language	English (US)
Pages (from-to)	2374-2381
Number of pages	8
Journal	Chemistry of Materials
Volume	20
Issue number	6
DOIs	https://doi.org/10.1021/cm703443q
State	Published - Mar 25 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering
Materials Chemistry

Access to Document

10.1021/cm703443q

Cite this

@article{aaa4c4ca20264f548cace848599a1c73,

title = "Soft chemical conversion of layered double hydroxides to superparamagnetic spinel platelets",

abstract = "We report the synthesis of a wide range of single-crystal spinel platelets with exposed (111) faces, lateral dimensions in the micrometer range, and thicknesses of 20-50 nm, prepared by soft chemical dehydration of well crystallized layered precursors. This method enables the synthesis of the metastable composition NiCoAlO4, which cannot be prepared by conventional solid state synthesis. Because of their nanoscale thickness, mosaic structure, shape anisotropy, and surface porosity, NiCoAlO4 and NiCo2O4 platelets exhibit room-temperature superparamagnetism (TB = 40 and 250 K, respectively) despite the fact that they have micrometer-size lateral dimensions. The accessibility of a wide range of superparamagnetic spinel platelets (as opposed to cubes or spheres) should be useful for studies in ferrofluids and related composite magnetic materials.",

author = "Mallouk, {Thomas E.} and Yoji Kobayashi and Xianglin Ke and Hideo Hata and Peter Schiffer",

year = "2008",

month = mar,

day = "25",

doi = "10.1021/cm703443q",

language = "English (US)",

volume = "20",

pages = "2374--2381",

journal = "Chemistry of Materials",

issn = "0897-4756",

publisher = "American Chemical Society",

number = "6",

}

TY - JOUR

T1 - Soft chemical conversion of layered double hydroxides to superparamagnetic spinel platelets

AU - Mallouk, Thomas E.

AU - Kobayashi, Yoji

AU - Ke, Xianglin

AU - Hata, Hideo

AU - Schiffer, Peter

PY - 2008/3/25

Y1 - 2008/3/25

N2 - We report the synthesis of a wide range of single-crystal spinel platelets with exposed (111) faces, lateral dimensions in the micrometer range, and thicknesses of 20-50 nm, prepared by soft chemical dehydration of well crystallized layered precursors. This method enables the synthesis of the metastable composition NiCoAlO4, which cannot be prepared by conventional solid state synthesis. Because of their nanoscale thickness, mosaic structure, shape anisotropy, and surface porosity, NiCoAlO4 and NiCo2O4 platelets exhibit room-temperature superparamagnetism (TB = 40 and 250 K, respectively) despite the fact that they have micrometer-size lateral dimensions. The accessibility of a wide range of superparamagnetic spinel platelets (as opposed to cubes or spheres) should be useful for studies in ferrofluids and related composite magnetic materials.

AB - We report the synthesis of a wide range of single-crystal spinel platelets with exposed (111) faces, lateral dimensions in the micrometer range, and thicknesses of 20-50 nm, prepared by soft chemical dehydration of well crystallized layered precursors. This method enables the synthesis of the metastable composition NiCoAlO4, which cannot be prepared by conventional solid state synthesis. Because of their nanoscale thickness, mosaic structure, shape anisotropy, and surface porosity, NiCoAlO4 and NiCo2O4 platelets exhibit room-temperature superparamagnetism (TB = 40 and 250 K, respectively) despite the fact that they have micrometer-size lateral dimensions. The accessibility of a wide range of superparamagnetic spinel platelets (as opposed to cubes or spheres) should be useful for studies in ferrofluids and related composite magnetic materials.

UR - http://www.scopus.com/inward/record.url?scp=41749084398&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=41749084398&partnerID=8YFLogxK

U2 - 10.1021/cm703443q

DO - 10.1021/cm703443q

M3 - Article

AN - SCOPUS:41749084398

SN - 0897-4756

VL - 20

SP - 2374

EP - 2381

JO - Chemistry of Materials

JF - Chemistry of Materials

IS - 6

ER -

Soft chemical conversion of layered double hydroxides to superparamagnetic spinel platelets

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this