In situ platelets formation into aqueous polymer colloids: The topochemical transformation from single to double layered hydroxide (LSH–LDH) uncovered

Stimpfling, Thomas; Langry, Arthur; Hintze-Bruening, Horst; Leroux, Fabrice

doi:10.1016/j.jcis.2015.10.010

Cited by 14 publications

(4 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, the LDH platelets with the smaller particle lateral size of about 202 ± 10 nm were prepared from the smaller particles of Mg(OH) 2 presenting a lateral size of 49 ± 5 nm, while the larger particle size of 334 ± 13 nm was from larger particles of Mg(OH) 2 of 176 ± 10 nm. This linear dependence may suggest a topochemical reaction between both materials, reminiscent of previous observation for the transformation from single to double layered hydroxides [37]. An in-situ characterization beyond the scope of the study will be necessary to unravel the reason of such lateral size dependence between the reactant and the reaction product, i.e., between the brucite and the LDH phase and why this LDH series mirrors that of the precursors.…”

Section: Structural Analysis Of Mg 2 Al-co 3 -Ldhsupporting

confidence: 56%

Size-dependent effect of MgAl-layered double hydroxides derived from Mg(OH)2 on thermal stability of poly(vinyl chloride)

Guo¹,

Zhang²,

Hu³

et al. 2021

Materials Today Communications

Self Cite

View full text Add to dashboard Cite

Developing green thermal stabilizer for poly(vinyl chloride) (PVC) today is a great challenge for materials as polymer filler. Here, the "salt-oxide/hydroxide" route in mild conditions is used to fabricate a series of Mg 2 Al-CO 3 -LDH samples from Mg(OH) 2 precursors with different average particle sizes from 202 ± 10 nm to 334 ± 13 nm. A linear correlation is observed for the lateral size of the platelets between Mg 2 Al-CO 3 -LDH samples and their associated Mg(OH) 2 precursors. After surface-organo-modification (SOM), organophilic Mg 2 Al-CO 3 -LDH samples are found to be highly dispersed into PVC and investigated as environmentfriendly thermal stabilizers. From the static/dynamic tests, the performances are strongly enhanced and related to the particle size of the LDH stabilizer, with the yellowish color aspect appearing later than for the commercial HT-3/PVC. Among the LDH series, the platelets with an average particle lateral size of about 220 ± 10 nm perform the best for the thermal stability for PVC polymer. Among the series, the corresponding PVC composite film presents comparatively the minimum color value in static/dynamic discoloration test, exhibiting the longer ignition time for proton initial release as well as the longer stability time in dehydrochlorination test. It underlines that the salt-oxide/hydroxide route is an efficient and environmentally friendly process in producing high-performance green LDH stabilizer for PVC.

show abstract

Section: Structural Analysis Of Mg 2 Al-co 3 -Ldhsupporting

confidence: 56%

Size-dependent effect of MgAl-layered double hydroxides derived from Mg(OH)2 on thermal stability of poly(vinyl chloride)

Guo¹,

Zhang²,

Hu³

et al. 2021

Materials Today Communications

Self Cite

View full text Add to dashboard Cite

show abstract

“…The direct coprecipitation of LDH in an aqueous polymer solution has been described as an efficient route to LDH‐based polymer nanocomposites (vide infra). Stimpfling et al reported the synthesis of acetate–ZnAl LDH in a solution containing an amphiphilic carboxylate‐bearing polyester by a modified polyol route . Interestingly, the formation mechanism proceeds through the precipitation and subsequent conversion of a Zn‐layered simple hydroxide phase.…”

Section: New Trends and Strategies For Ldh And Hybrid Ldh Synthesismentioning

confidence: 99%

Tailoring Hybrid Layered Double Hydroxides for the Development of Innovative Applications

Taviot-Guého

Prévot

Forano

et al. 2017

Adv Funct Materials

Self Cite

229

142

View full text Add to dashboard Cite

International audienceHybrid materials based on layered double hydroxides (LDHs) exhibit great potential in diverse fields such as health care, polymer composites, environment, catalysis, and energy generation. Indeed, the compositional flexibility and the scalability of LDH structures, their low cost, and their ease of synthesis have made hybrid LDHs extremely attractive for constructing smart and high-performance multifunctional materials. This review provides a comprehensive and critical overview of the current research on multifunctional hybrid LDHs. Organic–inorganic hybrid LDHs, intercalated and surface-immobilized structures, are both specifically addressed. The new trends and strategies for hybrid LDH synthesis are first described, and then the potential of the latest hybrid LDHs, polymer LDH nanocomposites, and LDH bio-nanocomposites are presented. Significant achievements published from ≈2010, including authors' results, which employ hybrid LDH assemblies in materials science, medicine, polymer nanocomposites, cement chemistry, and environmental technologies, are specifically addressed. It is concluded with remarks on present challenges and future prospects

show abstract

“…LDHs are also explored as additives for self-healing protective coatings because of their ability to simultaneously release corrosion inhibitors while absorbing corrosive anionic species . As the need for large-scale production of LDHs increases, their synthetic process and formation mechanism as particles, − nanoclusters, or nanoscrolls, on surfaces or into colloids, also gains more interest.…”

Section: Introductionmentioning

confidence: 99%

How Density Functional Theory Surface Energies May Explain the Morphology of Particles, Nanosheets, and Conversion Films Based on Layered Double Hydroxides

et al. 2017

View full text Add to dashboard Cite

Conversion films based on layered double 13 hydroxides constitute an important and environmentally 14 friendly technology for the corrosion protection of aeronaut-15 ical structures. Unfortunately, the morphology of layered 16 double hydroxide (LDH) conversion films is still not well 17 understood. In the present work, the structure and driving 18 forces behind the morphology of zinc−aluminum LDH 19 conversion films on aluminum alloy 2024 (AA2024) are explained from the perspective of molecular modeling. Since LDH 20 particles are the core structures of LDH conversion films, the first step in this work was to understand the relation between 21 structure and morphology of the particles themselves and the single-layer nanosheets that constitute them. Results regarding 22 53 Atomic force microscopy (AFM), X-ray diffraction (XRD), 25 54 and dynamic light scattering (DLS) 25 results were elucidated in 55 terms of the energies of different exposed surfaces of LDH 56 particles, obtained computationally using periodic model 57 density functional theory (DFT) calculations. These con-58 clusions were used to comprehend the molecular interactions 59 ruling the growth pattern of LDH conversion films onto 60 aluminum substrates. 1,26 61 Generally, conversion films consist in a first coating layer 62 grown directly on top of a metallic substrate to provide 63 corrosion protection by barrier effect and to promote adhesion 64 between the metal and the following layers of a coating 65 system. 27 In a previous study, Tedim et al. 1 developed a 66methodology to grow in situ a nanostructured film of Zn−Al LDHs directly onto the surface of aluminum alloys, taking 68 advantage of the dissolution of Al 3+ from the surface. 26,28 The 69 second two-valent cation (Zn 2+ ) is supplied from the treatment 70 bath. This approach 1 makes possible to intercalate corrosion 71 inhibitors by a subsequent step of ion-exchange providing the 72 LDH conversion films with the same active protective 73 functionality as LDH particles 7 but with the advantage of 74 being near the metallic surface. LDH particles typically exhibit a 75 platelike morphology. 25 When LDHs are grown directly onto 76 aluminum alloys, these plates are assembled perpendicularly to f1 77 the surface 1,26,29,30 as illustrated in Figure 1. 78 Herein, the formation and growth of LDH particles is 79 investigated by means of AFM and scanning electron 80 microscopy (SEM) complemented with additional information 81 about the energies of different exposed surfaces from DFT 82 calculations using periodic structural models of LDH clusters 83 interacting with aluminum surfaces. 84 The material investigated in this work was zinc−aluminum 85 LDH with a Zn:Al ratio of 2:1 and the nitrate anion intercalated 86 (Zn(2)Al−NO 3 ), since it can be easily synthesized as individual 87 particles 25 and as conversion films onto aluminum substrates. 1 88 It is also a functional material on its own. 8 Moreover, the nitrate 89 anion can easily allow us to obtain single-layer nanosheets, 18−22 90 an...

show abstract

In situ platelets formation into aqueous polymer colloids: The topochemical transformation from single to double layered hydroxide (LSH–LDH) uncovered

Cited by 14 publications

References 66 publications

Size-dependent effect of MgAl-layered double hydroxides derived from Mg(OH)2 on thermal stability of poly(vinyl chloride)

Size-dependent effect of MgAl-layered double hydroxides derived from Mg(OH)2 on thermal stability of poly(vinyl chloride)

Tailoring Hybrid Layered Double Hydroxides for the Development of Innovative Applications

How Density Functional Theory Surface Energies May Explain the Morphology of Particles, Nanosheets, and Conversion Films Based on Layered Double Hydroxides

Contact Info

Product

Resources

About