Exfoliation of α-hydroxides of nickel and cobalt in water

Nethravathi, C.; Viswanath, B.; Sebastian, Mency; Rajamathi, Michael

doi:10.1016/j.jcis.2010.01.047

Cited by 29 publications

(30 citation statements)

References 33 publications

(40 reference statements)

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“…All patterns exhibit (003), (006), (012), (015), (018), (110) and (113) characteristic reflections of the LDHs structure, which can be indexed in a 3R polytype [23,24] Figure 2B gives the IR spectra of three LDHs. The bands at 3445 cm −1 and 1630 cm −1 are attributed to the O-H stretching vibrations of layer hydroxyl groups and interlayer water molecules, respectively [28]. The band at 451 cm −1 is ascribed to deformation of M-OH in the brucite-like layers.…”

Section: Measurementsmentioning

confidence: 97%

Flame Retardance and Smoke Suppression of CFA/APP/LDHs/EVA Composite

Wang

Shi

et al. 2016

Applied Sciences

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Abstract:A new intumescent flame-retardants (IFR) system including the charing-foaming agent (CFA), ammonium polyphosphate (APP) and modified-layered double hydroxides (LDHs) with different transition metals (Ni, Co, Cu) were used in the ethylene vinyl acetate (EVA) matrix. Both the limiting oxygen index and the vertical burning tests indicate that the CFA/APP system and LDHs have significant synergistic flame retardant effects. The morphology of combustion residues indicates that the many pores of residues can prevent the melt dripping. The thermal analysis shows that the flame retardants obviously enhanced the thermal degradation temperature of ethylene-based chains of the composites. The cone calorimeter test reveals that the CO 2 and combustion residues have an important influence on the reduction of heat release rate (HRR), the smoke production rate (SPR), the production rate and the mean release yield of CO. The composite containing Cu (ELDH-Cu) delivers an 82% reduction in peak heat release rate, while ELDH-Ni has the best CO suppression among all composites. This work not only confirms the flame retardance and smoke suppression of CFA/APP/LDH/EVA, but also provides an effective method for producing new flame retardants and smoke suppressants.

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Section: Measurementsmentioning

confidence: 97%

Flame Retardance and Smoke Suppression of CFA/APP/LDHs/EVA Composite

Wang

Shi

et al. 2016

Applied Sciences

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“…11,12 Moreover, 0D, 1D, 2D and 3D morphologies have been compared, resulting in higher electrochemical activity and superior cycling reversibility of the 3D hierarchical nanostructures. 23,24 The presence of these anions, along with water molecules within the structure, results in a turbostratic phase whose basal planes are not perfectly aligned along the c-axis but slightly deviated from one another. 19 Nickel hydroxide crystallizes in two different polymorphs, αand β-NiĲOH) 2 .…”

Section: Introductionmentioning

confidence: 99%

“…These octahedra share their vertexes to create a laminar structure. 15,23,27,28 Sonochemistry has been employed successfully for the synthesis of nickel hydroxide nanopowders in the past years. [20][21][22] The crystallographic structure of this metastable phase is not well described since the interlaminar space depends on the type of inclusion present in the structure, which normally varies from 7 to 8 Å.…”

Section: Introductionmentioning

confidence: 99%

Influence of ultrasound on the instantaneous synthesis of tridimensional α-Ni(OH)₂ nanostructures and derived NiO nanoparticles

et al. 2015

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Nickel hydroxides present an extraordinary importance in the development of electrochemical devices. In contrast to the use of ammonia as a direct precipitating agent, we present herein the instantaneous precipitation of α-NiĲOH) 2 nanopowders by the addition of a nickel salt to an ammonia solution. The synthesis is based on the oversaturation of the solution in the absence of any additive or other metallic cations, where ammonia plays a role as a complexing agent for intermediate nickel compounds. The influence of ultrasound on both the microstructure and the crystalline structure is discussed and the differences are referred to a new parameter (S parameter) which quantifies the amount of power in watts per cm 2 that a mol of ĳNiĲNH 3 ) 6 ] 2+ experiences. The description of the nucleation and growth processes of the different powders studied led to the understanding of the effect of ultrasound on the crystallography of α-NiĲOH) 2 . The porosity of the samples is also evaluated and its percentage and type are also correlated to the synthesis conditions. The transformation of α-NiĲOH) 2 to NiO is also considered and their optical properties are evaluated as an initial indicator of their promising use as electrochemical devices. CrystEngCommThis journal is

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“…2 shows IR spectra of the synthesized LDHs. A broad and intense IR absorption band between 4000 cm À1 and 3100 cm À1 is attributed to the O-H stretching vibrations of layer hydroxyl groups and interlayer water molecules for the synthesized four LDHs [47]. It shows that the band intensity of MgAl-MHT and NiMgAl-MHT at near 1638 cm À1 is stronger than that of MgAl-CHT and NiMgAl-CHT.…”

Section: Characterizationmentioning

confidence: 90%

Effect of Ni cations and microwave hydrothermal treatment on the related properties of layered double hydroxide–ethylene vinyl acetate copolymer composites

Wang

Yang

et al. 2011

Journal of Colloid and Interface Science

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Exfoliation of α-hydroxides of nickel and cobalt in water

Cited by 29 publications

References 33 publications

Flame Retardance and Smoke Suppression of CFA/APP/LDHs/EVA Composite

Flame Retardance and Smoke Suppression of CFA/APP/LDHs/EVA Composite

Influence of ultrasound on the instantaneous synthesis of tridimensional α-Ni(OH)₂ nanostructures and derived NiO nanoparticles

Effect of Ni cations and microwave hydrothermal treatment on the related properties of layered double hydroxide–ethylene vinyl acetate copolymer composites

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Exfoliation of α-hydroxides of nickel and cobalt in water

Cited by 29 publications

References 33 publications

Flame Retardance and Smoke Suppression of CFA/APP/LDHs/EVA Composite

Flame Retardance and Smoke Suppression of CFA/APP/LDHs/EVA Composite

Influence of ultrasound on the instantaneous synthesis of tridimensional α-Ni(OH)2 nanostructures and derived NiO nanoparticles

Effect of Ni cations and microwave hydrothermal treatment on the related properties of layered double hydroxide–ethylene vinyl acetate copolymer composites

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Influence of ultrasound on the instantaneous synthesis of tridimensional α-Ni(OH)₂ nanostructures and derived NiO nanoparticles