Structure and Composition of the Layered Double Hydroxides of Mg and Fe: Implications for Anion‐Exchange Reactions

Manohara, G. V.; Prasanna, S.; Kamath, P. Vishnu

doi:10.1002/ejic.201100104

Cited by 31 publications

(19 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 19,132,133 ] In this type of structure, cations or anions entered the interlayer space to neutralize the charge of layers and acted as a stabilizer to maintain the layered structure. [ 134,135 ] The concentration of ions in the interlayer was determined by the charge on the [MO x ] or [M(OH) x ] layers. There can be crystal water between the layers to maintain the stability of the layered structure.…”

Section: Msmmentioning

confidence: 99%

Salt‐Assisted Synthesis of 2D Materials

Huang

Jin

et al. 2020

Adv Funct Materials

136

112

View full text Add to dashboard Cite

2D materials have demonstrated good chemical, optical, electrical, and magnetic characteristics, and offer great potential in numerous applications. Corresponding synthesis technologies of 2D materials that are highquality, high-yield, low-cost, and time-saving are highly desired. Salt-assisted methods are emerging technologies that can meet these requirements for the fabrication of 2D materials. Herein, the recent process for the salt-assisted synthesis of 2D materials and their typical applications are summarized. First, the properties of salt crystals and molten salts are briefly introduced, and then some examples of 2D materials synthesis with the assistance of salt as well as their representative applications are presented. The underlying mechanisms of salts with different states on the formation of 2D morphology are discussed to aid in the rational design of synthetic route of 2D materials. At last, the challenges and future perspectives for salt-assisted methods are briefly described. This review provides guidance for the controllable synthesis of 2D materials based on the salt-assisted approaches.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.201908486.MoO 3 , and LaNb 2 O 7 ), [14][15][16] layered double hydroxides (LDHs, e.g., Mg 6 Al 2 (OH) 16 CO 3 •4H 2 O), [17] hexagonal-boron nitride (h-BN), [2,18] transition metal halides (such as MoCl 2 and CrCl 3 ), [19] black phosphorus, [20] graphitic carbon nitride (g-C 3 N 4 ), [5] MXene (such as Ti 2 C and Ti 3 CN), [21][22][23][24][25] and clays (for instance, [(Mg 3 )(Si 2 O 5 ) 2 (OH) 2 ] and [(Al 2 )(Si 3 Al) O 10 (OH) 2 ]K). [19] Notably, many nonlayered structure species can also form 2D morphology with specific synthetic methods, largely expanding the 2D family (such as hexagonal-MoO 3 (h-MoO 3 ), hexagonal-WO 3 (h-WO 3 ), [15] transition metal nitrides (TMNs), [26,27] and transition metal phosphides (TMPs)). [28] To exploit the applications of 2D materials, the development of a synthetic method should be prioritized. Currently, synthesis processes of 2D materials could be divided into two categories, naming the top-down and bottom-up approaches. [29][30][31] Generally, exfoliation is the most common top-down method to produce monolayer or few-layer 2D materials. [19,32] Graphene was first prepared by mechanical exfoliation of highly oriented pyrolytic graphite with sellotape in 2004. [33] The exfoliation can weaken the interlayer Van der Waals force for bulk materials with layered crystal structures while maintain the covalent bonding in plane to produce monolayer or few-layer nanosheets. Although the productivity based on this method is limited due to the low efficiency, the exfoliation approach provides a new synthesis methodology for 2D materials. A series of studies on liquid exfoliation have been conducted by Coleman and co-workers. [19,34,35] By sonicating the bulk material in an appropriate solvent with similar interface energy, 2D material ink can be prepared. After the liq...

show abstract

Section: Msmmentioning

confidence: 99%

Salt‐Assisted Synthesis of 2D Materials

Huang

Jin

et al. 2020

Adv Funct Materials

136

112

View full text Add to dashboard Cite

show abstract

“…166, hexagonal axes), although many other derivative structures have been published that involve various cations and interlayer anions (e.g. Bellotto et al, 1996;Constantino et al, 1998;de Roy et al, 2001;Radha et al, 2007a,b;Johnsen et al, 2010;Manohara et al, 2011;Mills et al, 2011). O1 is the O atom of the octahedral layer and O2 belongs to the interlayer anion or water molecule.…”

Section: Model Crystal Structures For Layered Double Hydroxidesmentioning

confidence: 99%

The importance of proper crystal-chemical and geometrical reasoning demonstrated using layered single and double hydroxides

Richardson¹

2013

Acta Crystallogr Sect B

View full text Add to dashboard Cite

Atomistic modelling techniques and Rietveld refinement of Xray powder diffraction data are widely used but often result in crystal structures that are not realistic, presumably because the authors neglect to check the crystal-chemical plausibility of their structure. The purpose of this paper is to reinforce the importance and utility of proper crystal-chemical and geometrical reasoning in structural studies. It is achieved by using such reasoning to generate new yet fundamental information about layered double hydroxides (LDH), a large, much-studied family of compounds. LDH phases are derived from layered single hydroxides by the substitution of a fraction (x) of the divalent cations by trivalent. Equations are derived that enable calculation of x from the a parameter of the unit cell and vice versa, which can be expected to be of widespread utility as a sanity test for extant and future structure determinations and computer simulation studies. The phase at x = 0 is shown to be an form of divalent metal hydroxide rather than the polymorph. Crystal-chemically sensible model structures are provided for -Zn(OH) 2 and Niand Mg-based carbonate LDH phases that have any trivalent cation and any value of x, including x = 0 [i.e. for -M(OH) 2 ÁmH 2 O phases].

show abstract

“…The interlayer galleries are made up of chargebalancing anions and water, which provide significant anionic exchange capacity. 24 This feature makes LDH unique among inorganic materials. Depending on their constituents, LDH may be hydrophobic or hydrophilic.…”

Section: Nano-layered Double Hydroxidesmentioning

confidence: 99%