Rapid and One-Step Transformation of LiAlH4 to Inorganic and Organic Anion Intercalated Li-Al Layered Double Hydroxides

2019 ◽  
Vol 2019 (19) ◽  
pp. 2412-2418 ◽  
Author(s):  
Meenakshi Pokhriyal ◽  
Dileep Kumar Yadav ◽  
Sachin Pal ◽  
Sitharaman Uma ◽  
Rajamani Nagarajan
Keyword(s):  
Layered Double Hydroxides ◽  
Organic Anion ◽  
One Step ◽  
Double Hydroxides ◽  
Inorganic And Organic

scholarly journals Exploring the Wet Mechanochemical Synthesis of Mg-Al, Ca-Al, Zn-Al and Cu-Al Layered Double Hydroxides from Oxides, Hydroxides and Basic Carbonates

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 954 ◽  
Author(s):  
Brenda Antoinette Barnard ◽  
Frederick Johannes Willem Jacobus Labuschagné
Keyword(s):  
Mechanochemical Synthesis ◽  
Layered Double Hydroxides ◽  
Raw Materials ◽  
Green Method ◽  
Synthesis Conditions ◽  
Starting Point ◽  
Bead Mill ◽  
One Step ◽  
Synthesis Procedure ◽  
Double Hydroxides

The synthesis of Mg-Al, Ca-Al, Zn-Al and Cu-Al layered double hydroxides (LDHs) was investigated with a one-step wet mechanochemical route. The research aims to expand on the mechanochemical synthesis of LDH using a mill designed for wet grinding application. A 10% slurry of solids was added to a Netzsch LME 1 horizontal bead mill and milled for 1 h at 2000 rpm. Milling conditions were selected according to machine limitations and as an initial exploratory starting point. Precursor materials selected consisted of a mixture of oxides, hydroxides and basic carbonates. Samples obtained were divided such that half was filtered and dried at 60 °C for 12 h. The remaining half of the samples were further subjected to ageing at 80 °C for 24 h as a possible second step to the synthesis procedure. Synthesis conditions, such as selected precursor materials and the MII:MIII ratio, were adapted from existing mechanochemical methods. LDH synthesis prior to ageing was successful with precursor materials observably present within each sample. No Cu-Al LDH was clearly identifiable. Ageing of samples resulted in an increase in the conversion of raw materials to LDH product. The research offers a promising ‘green’ method for LDH synthesis without the production of environmentally harmful salt effluent. The synthesis technique warrants further exploration with potential for future commercial up-scaling.

scholarly journals Co-intercalated layered double hydroxides as thermal and photo-oxidation stabilizers for polypropylene

2018 ◽  
Vol 9 ◽  
pp. 2980-2988 ◽  
Author(s):  
Qian Zhang ◽  
Qiyu Gu ◽  
Fabrice Leroux ◽  
Pinggui Tang ◽  
Dianqing Li ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
High Performance ◽  
Composite Films ◽  
Inorganic Materials ◽  
Photo Oxidation ◽  
Molecular Anions ◽  
Multifunctional Additives ◽  
One Step ◽  
Overall Resistance ◽  
Double Hydroxides

An elegant and efficient approach consisting in the co-intercalation of stabilizing molecular anions is described here. The thermal stabilizer calcium diethyl bis[[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]phosphonate] (Irganox 1425, MP-Ca) and a photo-oxidation stabilizer (hindered amine light stabilizer, HALS) are co-intercalated into the interlayer regions of layered double hydroxides (LDH) in a one-step coprecipitation. These hybrid organic–inorganic materials are successively dispersed in polypropylene to form H n M n ′-Ca2Al/PP composite films (with H = HALS and M = MP) through a solvent casting method. The corresponding crystalline structure, chemical composition, morphology as well as the resistance against thermal aging and photo-oxidation are carefully investigated by various techniques. The results show that the powdered H n M n ′-Ca2Al-LDHs hybrid materials have a much higher thermal stability than MP-Ca and HALS before intercalation. In addition, the H n M n ′-Ca2Al/PP composites exhibit a higher overall resistance against thermal degradation and photo-oxidation compared to LDHs intercalated with only HALS or MP. This underlines the benefit of the co-intercalation. The co-intercalated LDH materials pave a new way in designing and fabricating high-performance multifunctional additives for polymers.

Cobalt iron phosphide nanoparticles embedded within a carbon matrix as highly efficient electrocatalysts for the oxygen evolution reaction

2019 ◽  
Vol 55 (62) ◽  
pp. 9212-9215 ◽  
Author(s):  
Jiang Han ◽  
Gen Chen ◽  
Xiaohe Liu ◽  
Ning Zhang ◽  
Shuquan Liang ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Layered Double Hydroxides ◽  
Oxygen Evolution Reaction ◽  
Carbon Matrix ◽  
Iron Phosphide ◽  
Highly Efficient ◽  
Cobalt Iron ◽  
One Step ◽  
Double Hydroxides

Co3FePx/C nanocomposites were derived from one-step phosphorization of anthraquinone-2-sulfonate (AQS2) intercalated Co3Fe layered double hydroxides (Co3Fe LDHs).

Room-temperature efficient NO2 gas sensors fabricated by porous 3D flower-like ZnAl-layered double hydroxides

2020 ◽  
Vol 44 (42) ◽  
pp. 18469-18480
Author(s):  
Ye Hong ◽  
Di Wang ◽  
Chong Lin ◽  
Shuiting Luo ◽  
Qingjiang Pan ◽  
...  
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Hydrothermal Method ◽  
Gas Sensors ◽  
Layered Double Hydroxides ◽  
Room Temperature ◽  
Sodium Dodecyl ◽  
Three Dimensional ◽  
One Step ◽  
No2 Gas Sensors ◽  
Double Hydroxides

Three-dimensional (3D) flower-like zinc and aluminum-sodium dodecyl sulfate-layered double hydroxides (ZnAl-SDS-LDHs) intercalated by anions were prepared using a simple one-step hydrothermal method.

scholarly journals Undoped and Eu3+ Doped Magnesium-Aluminium Layered Double Hydroxides: Peculiarities of Intercalation of Organic Anions and Investigation of Luminescence Properties

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 736 ◽  
Author(s):  
Aurelija Smalenskaite ◽  
Lina Pavasaryte ◽  
Thomas Yang ◽  
Aivaras Kareiva
Keyword(s):  
Layered Double Hydroxides ◽  
Organic Anion ◽  
Sol Gel ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Organic Guests ◽  
Double Hydroxides ◽  
Scanning Electron

The Mg3/Al and Mg3/Al0.99Eu0.01 layered double hydroxides (LDHs) were fabricated using a sol-gel chemistry approach and intercalated with different anions through ion exchange procedure. The influence of the origin of organic anion (oxalate, laurate, malonate, succinate, tartrate, benzoate, 1,3,5-benzentricarboxylate (BTC), 4-methylbenzoate (MB), 4-dimethylaminobenzoate (DMB) and 4-biphenylacetonate (BPhAc)) on the evolution of the chemical composition of the inorganic-organic LDHs system has been investigated. The obtained results indicated that the type and arrangement of organic guests between layers of the LDHs influence Eu3+ luminescence in the synthesized different hybrid inorganic–organic matrixes. For the characterization of synthesis products X-ray diffraction (XRD) analysis, infrared (FTIR) spectroscopy, fluorescence spectroscopy (FLS), and scanning electron microscopy (SEM), were used.

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