Interaction of alkylamines with different types of layered compounds

Lagaly, G.

doi:10.1016/0167-2738(86)90057-3

Cited by 515 publications

(309 citation statements)

References 13 publications

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“…Our observation of non-exfoliation phenomenon is presumably due to the additional energy needed to overcome partially or fully interdigitated interactions between the alkyl chains of the intercalates (Fig. 3b) 30,32,33 .…”

Section: Resultsmentioning

confidence: 94%

“…The intercalation and gap-widening capability of Lewis base molecular intercalates were investigated depending on the alkyl chain length of primary amines such as propyl-, butyl-and hexyl-amine ( Fig. 2b) 29,30 . Here, an excess amount of intercalate is added to TiS 2 nanoparticle in dimethyl sulphoxide (DMSO) at room temperature, and the reaction mixture is stirred for 30 min to 5 h depending on the chain length of the intercalate molecules.…”

Section: Resultsmentioning

confidence: 99%

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Tandem intercalation strategy for single-layer nanosheets as an effective alternative to conventional exfoliation processes

et al. 2015

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Simple and effective generation of transition metal chalcogenides (TMCs) in a single-layer form has been a challenging task. Here we present a tandem molecular intercalation (TMI) as a new exfoliation concept for producing single-layer TMCs from multi-layer colloidal TMC nanostructures in solution phase. TMI requires tandem Lewis base intercalates, where short 'initiator' molecules first intercalate into TMCs to open up the interlayer gap, and the long 'primary' molecules then bring the gap to full width so that a random mixture of intercalates overcomes the interlayer force. Spontaneous exfoliation then yields single-layer TMCs. The TMI process is uniquely advantageous because it works in a simple one-step process under safe and mild conditions (that is, room temperature without sonication or H 2 generation). With the appropriate intercalates, we have successfully generated single-layer nanostructures of group IV (TiS 2 , ZrS 2 ), group V (NbS 2 ) and VI (WSe 2 , MoS 2 ) TMCs.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Tandem intercalation strategy for single-layer nanosheets as an effective alternative to conventional exfoliation processes

et al. 2015

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“…197 The arrangement of a lateral monolayer of the alkyl chains evolves to a paraffin-type bilayer in 198 the interlayer of micas with the increase in surfactant concentration. 33 The reason is that the 199 interlayer alkylammonium molecules cannot form parallel layer arrangements in the interlayer 200 space of the mica when the interlayer cation density is higher than 1.94. and consequently, can be used as a probe of the packing arrangements in alkyl chain 209 assemblies. 57,58 When the methylene groups are found in an all parallel arrangement, a triclinic 210 subcell, a sharp and narrow singlet at 1472 cm -1 is observed.…”

Section: Hydrocarbon Chains 194mentioning

confidence: 99%

Self-Assembling of Tetradecylammonium Chain on Swelling High Charge Micas (Na-Mica-3 and Na-Mica-2): Effect of Alkylammonium Concentration and Mica Layer Charge

et al. 2015

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A family of tetradecylammonium micas is synthesized using synthetic swelling micas with high layer charge (Na n Si 8−n Al n Mg 6 F 4 O 20 •XH 2 O, where n = 2 and 3) exchanged with tetradecylammonium cations. The molecular arrangement of the surfactant is elucidated on the basis of XRD patterns and DTA.The ordering conformation of the surfactant molecules into the interlayer space of micas is investigated by IR/FT, 13 C, 27 Al, and 29 Si MAS NMR. The structural arrangement of the tetradecylammonium cation in the interlayer space of highcharge micas is more sensitive to the effect of the mica layer charge at high concentration. The surfactant arrangement is found to follow the bilayer-paraffin model for all values of layer charge and surfactant concentration. However, at initial concentration below the mica CEC, a lateral monolayer is also observed. The amount of ordered conformation all-trans is directly proportional to the layer charge and surfactant concentration.

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“…Surfactants were shown to arrange on the surface of clays in different ways depending on their molecular structure and surface coverage [35,44]. At small surface coverage the molecules orientate parallel to the surface, while arrange vertically at larger amounts.…”

Section: Surface Structure Consequencesmentioning

confidence: 99%

“…Good examples are montmorillonites and layered double hydroxides [4,35]. Accordingly, the theoretical possibility exists that halloysite can also adsorb quercetin within its layered structure.…”

Section: Halloysite Characteristicsmentioning

confidence: 99%

Adsorption of an active molecule on the surface of halloysite for controlled release application: Interaction, orientation, consequences

Hári

Polyák

Mester

et al. 2016

Applied Clay Science

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The goal of the study was to check the possible use of halloysite nanotubes as a controlled release natural antioxidant device with quercetin as the active component. The mineral was thoroughly characterized by various techniques including the determination of particle and tube morphology, specific surface area, pore size and volume, as well as surface energy. The high surface energy of halloysite predicted strong adsorption of active molecules on its surface and consequently difficult release. FTIR spectroscopy confirmed the existence of strong interactions, energetically heterogeneous halloysite surface and multilayer coverage at large loadings. FTIR and XRD experiments proved the complete lack of intercalation and showed that below 3.5 wt% quercetin loading, most of the molecules are located within the halloysite tubes. Molecular modelling indicated the parallel orientation of quercetin molecules with the surface. Critical concentrations derived from various measurements agreed well with each other further confirming that up to about 4.0 wt% loading, quercetin is bonded very strongly to the halloysite surface. As a consequence, the dissolution of active molecules is very difficult or impossible, especially into apolar media, thus neither stabilization nor controlled release effect can be expected below that concentration.

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Interaction of alkylamines with different types of layered compounds

Cited by 515 publications

References 13 publications

Tandem intercalation strategy for single-layer nanosheets as an effective alternative to conventional exfoliation processes

Tandem intercalation strategy for single-layer nanosheets as an effective alternative to conventional exfoliation processes

Self-Assembling of Tetradecylammonium Chain on Swelling High Charge Micas (Na-Mica-3 and Na-Mica-2): Effect of Alkylammonium Concentration and Mica Layer Charge

Adsorption of an active molecule on the surface of halloysite for controlled release application: Interaction, orientation, consequences

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