Surfactant-free hydrothermal synthesis of lithium aluminate microbricks and nanorods from aluminium oxide nanoparticles

Joshi, Upendra A.; Chung, Soo Hyun; Lee, Jae Sung

doi:10.1039/b508168h

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…Our objective is to develop a simple, large-scale process for the synthesis of lithium aluminate nanorods from all-inorganic precursors without using any organic precursor or surfactant, to make the synthesis process more economic. Recently, we reported the surfactant-free hydrothermal synthesis of lithium aluminate microbricks and nanorods as a preliminary communication . In continuation of the work, we describe in this paper the effect of various synthesis parameters such as lithium precursor, hydrothermal temperature, time, and calcination temperature on morphology.…”

Section: Introductionsupporting

confidence: 89%

Large-Scale, Surfactant-Free, Hydrothermal Synthesis of Lithium Aluminate Nanorods: Optimization of Parameters and Investigation of Growth Mechanism

Joshi

Lee

2007

Inorg. Chem.

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Lithium aluminate nanorods were successfully synthesized from Al2O3 nanoparticles and lithium hydroxide by a simple, large-scale hydrothermal process without any surfactant or template. The various reaction parameters were optimized to achieve the maximum yield. The as-obtained nanorods had orthorhombic beta-lithium aluminate structure with edges in the range of 40-200 nm and lengths of 1-2 mum confirmed by SEM, TEM, XRD, and NMR. Upon calcination at 1273 K for 12 h it transformed to gamma-lithium aluminate, yet maintained the initial morphology, demonstrating the thermal stability. The ratio of lithium hydroxide to aluminum oxide showed a significant effect on the morphology as Li/Al = 1 gives "microroses", whereas Li/Al = 3 and Li/Al = 15 gave "microbricks" and "nanorods", respectively. Investigation of the mechanism showed that the nanorods were formed via a "rolling-up" mechanism. As we used all-inorganic raw materials and a simple synthetic procedure under mild conditions, the scale-up of this process for large-scale production should be very easy.

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Section: Introductionsupporting

confidence: 89%

Large-Scale, Surfactant-Free, Hydrothermal Synthesis of Lithium Aluminate Nanorods: Optimization of Parameters and Investigation of Growth Mechanism

Joshi

Lee

2007

Inorg. Chem.

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“…Other technological applications are the fabrication of phosphors [8,9], catalysts [10,11] and sorbents for the selective CO2 capture [12,13]. Among these ceramics, different polymorphs of lithium monoaluminate (α-, β-and γ-LiAlO2) have been the subject of several studies [14][15][16][17][18][19][20][21][22][23][24][25]. For example, LiAlO2 has been reported as a good candidate as host matrix for neutron scintillators [14,15], as electrolyte matrix in molten carbonate fuel cells [16][17][18][19], as well as a candidate for certain luminescent devices [20,21] and heterogeneous catalyst for biodiesel production, [25] among others.…”

Section: Introductionmentioning

confidence: 99%

“…In this sense, different chemical synthesis pathways have been studied to obtain γ-LiAlO2 ultrafine powders exhibiting the desirable textural and morphological features for specific uses. Some of these synthesis routes include hydrothermal [23], sol-gel [20,27], and combustion related techniques [28]. Citrate precursor is a modified sol-gel process, which also involves a combustion stage for the chemical synthesis of fine ceramic oxide powders [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Nanosized Lithium Aluminate (γ-LiAlO2) Synthesized by EDTA-citrate Complexing Method, Using Different Thermal Conditions

et al. 2019

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Lithium aluminate (LiAlO2) polymorphs have been synthesized by solid-state reaction, but these ceramics usually show certain limitations attributed to the low control on the particle size, morphology and specific surface area. In this sense, different chemical synthesis pathways, citrate precursor among them, have been studied to obtain ultrafine powders exhibiting enhanced textural and morphological features. Synthesis by citrate precursor method would involve the use of alternative chelating agents for the formation of more stable metal-chelate species, such as ethylene-diamine-tetra-acetic acid (EDTA). Thus, the aim of this work was to study the g-LiAlO2 synthesis by EDTA-citrate complexing approach to establish the effect of the synthesis route on the structural and microstructural characteristics of the resultant powders. The synthesized ceramic powders were calcined (600-900°C) and characterized by simultaneous TG-DTA, XRD, SEM, TEM and N2 adsorption-desorption techniques. Crystallization transition process from the precursors to the g-LiAlO2 phase is reported. Results show that chemical synthesis by EDTA-citrate complexing method can produce pure and crystalline g-LiAlO2 nanoparticles at relative low temperatures (700 ºC). The possible formation mechanism is discussed. Resumen. El aluminato de litio (LiAlO2) en sus diferentes fases polimórficas se ha sintetizado por la técnica convencional de reacción en estado sólido; sin embargo, este método presenta ciertas limitaciones desde el punto de vista del control que se tiene en el tamaño de partícula, morfología y área específica. En este sentido, se han estudiado diferentes rutas de síntesis química para la obtención de polvos ultrafinos que presenten propiedades texturales y características morfológicas mejoradas. Entre éstas, se encuentra la síntesis por citratos precursores; un método que además del ácido cítrico, puede involucrar el uso de agentes complejantes o quelantes alternativos para promover la formación de especies más estables. Un ejemplo de lo anterior es el ácido etilendiaminotetraacético o EDTA por sus siglas en inglés. El objetivo de este trabajo es estudiar la síntesis del g-LiAlO2 por el método del citrato precursor-EDTA y establecer el efecto de la ruta de síntesis sobre las características estructurales y microestructurales de los compuestos obtenidos. Los polvos cerámicos sintetizados fueron calcinados a diferentes temperaturas (600-900 ºC) y caracterizados por diferentes técnicas como ATG-ATD, DRX, MEB, MET y adsorción-desorción de N2 a baja presión. Se estudió el proceso de descomposición y cristalización de los precursores hasta la obtención del óxido metálico de aluminato de litio. Los resultados muestran que el método de síntesis propuesto es adecuado para la obtención, a baja temperatura (700 ºC), de nanopartículas de la fase cristalina y pura del g-LiAlO2. Se discute un posible mecanismo de formación del compuesto de estudio a partir de los geles precursores usados.

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Surfactant‐Free Hydrothermal Synthesis of Lithium Aluminate Microbricks and Nanorods from Aluminum Oxide Nanoparticles.

2005

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of Lithium Aluminate Microbricks and Nanorods from Aluminum Oxide Nanoparticles. -β-LiAlO2 microbricks and rectangular nanorods are synthesized hydrothermally from mixtures of LiOH and Al2O3 nanopowders in H2O (Teflon coated reactor, 150°C, 3 d). The samples are characterized by SEM and TEM. The morphology of the obtained particles is controlled by simply changing the Li/Al molar ratio. Scale-up of the preparation method for large-scale production should be very easy. -(JOSHI, U. A.; CHUNG, S. H.; LEE*, J. S.; Chem.

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Surfactant-free hydrothermal synthesis of lithium aluminate microbricks and nanorods from aluminium oxide nanoparticles

Abstract: Beta-LiAlO2 microbricks and rectangular nanorods have been successfully synthesized from Al2O3 nanoparticles by a simple hydrothermal process without any surfactant or template, by simply changing the Li/Al molar ratio.

Cited by 8 publications

References 21 publications

Large-Scale, Surfactant-Free, Hydrothermal Synthesis of Lithium Aluminate Nanorods: Optimization of Parameters and Investigation of Growth Mechanism

Large-Scale, Surfactant-Free, Hydrothermal Synthesis of Lithium Aluminate Nanorods: Optimization of Parameters and Investigation of Growth Mechanism

Nanosized Lithium Aluminate (γ-LiAlO2) Synthesized by EDTA-citrate Complexing Method, Using Different Thermal Conditions

Surfactant‐Free Hydrothermal Synthesis of Lithium Aluminate Microbricks and Nanorods from Aluminum Oxide Nanoparticles.

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