Nano-hybrid materials and nano-composite materials based on PVA

Saber, Osama; Jaafari, Abdullah A. Al

doi:10.1504/ijnbm.2009.027712

Cited by 3 publications

(5 citation statements)

References 9 publications

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“…(10f), which was typical for the LDH morphology. Also, the image indicated that the average size of the organic compound containing crystallites is much larger than that of the sample before intercalation reaction agreeing wit h our previous results [23][24][25].…”

Section: Scanning Electron Microscope (Sem)supporting

confidence: 91%

“…There are no XRD results reported in the literature for Zn-Al-Si LDH. However, the XRD results of Zn-Al-Si LDH are similar to the XRD results, which were previously published for Zn-Al LDH and Co-Ti LDH [1,22,24,25] The good agreement between the values corresponding to successive diffractions by basal planes, i.e., d(003) = 2d(006) = 3d(009) for Zn-Al-Si LDH, reveals highly packed stacks of brucite- like layers ordered along axis c. Parameter ' c ' which is related to the thickness of the brucite-like layer and the interlayer distance, is commonly calculated as three times the spacing for plane (003), i.e., 2.31~2.34 nm. With increasing Al and Si contents in LDH structure, the reflections of (003) shift to lower 2 angles, Figs.…”

Section: X-ray Powder Diffractionsupporting

confidence: 88%

“…Zn-Al-Si LDHs were synthesized through co-precipitation method at high temperature by reacting aqueous solutions containing a mixture of zinc chloride, aluminum chloride and silicon chloride as precursors and urea as precipitant and pH-controller [24,25]. The percentages of both aluminum and silicon are 7~35 mole% as shown in Table 1 Also, Zn-Al LDH was prepared by the same method for comparison.…”

Section: Experimental Methods Materialsmentioning

confidence: 99%

“…Typically, appropriate amounts of sodium salts of organic acids (n-capric and suberic acid) were dissolved in 10 ml of deionizeddistilled water (concentration about 0.1~ 0.2 M) with ultrasonic treatment [23][24][25]. The LDH (0.24 g) were mixed with the solution of organic acid under argon gas and stirred at 60 °C for 6 h or at room temperature for 72 h. After filtration and washing, the samples were dried under vacuum at room temperature.…”

Section: Intercalationmentioning

confidence: 99%

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Preparation, Characterization and Intercalation Reactions of New Nano-Ordered Layered Materials, Zn-Al-Si LDH

Saber

2011

CNANO

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Layered double hydroxides (LDHs) and anionic clay are nano-ordered layered compounds and are well known for their ability to intercalate anionic compounds. Most LDHs are prepared conventionally only with di-and tri-valent cations. Alumina-silicate structures are very familiar in the literature as cationic clay or zeolite structure, however, there is no data for alumina-silicate as anionic clay. In this study, a new series of Zn-Al-Si LDHs with various Zn/Al/Si ratios, consisting of di-, tri-, and tetra-valent cations, were prepared and characterized by energy-dispersive X-ray spectrometry (SEM/EDS), X-ray powder diffraction (XRD), infrared spectra (IR), thermal analyses (TG, DTG and DTA), and scanning electron microscopy (SEM). Characterization of the samples containing molar percentages of aluminum and silicon 20~40 % revealed formation of well crystallized phases, layered structures and no excess phases. XRD results and thermal analyses indicated that the carbonate anions have two orientations inside the interlayer region. After intercalation reactions with organic acids, mono-and di-carboxylic acids, the interlayer spacing of Zn-Al-Si LDH increased and organic-inorganic nano-hybrid materials formed. SEM images showed that the morphology of Zn-Al-Si LDH before and after intercalation reactions is plate-like structure. The results presented in this work conclude that the formation of the layer double hydroxide is not limited to the reactions between di-and trivalent cations, although these are the only reactions reported by many researchers.Keywords: Nano structured materials, nano layered materials, new layered double hydroxides, nano hybrid materials, host-guest interactions. INTRODUCTIONNano structured materials are promising materials for a large number of practical applications such as catalysis, adsorption, microelectronics, pharmaceutics, photochemistry, food science, drug delivery, and electrochemistry [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].Layered double metal hydroxides (LDHs) or anionic clays are one of the nano structured materials. The net positive charge, which is due to substitution of trivalent ions by divalent metal ions in the brucite-like metal hydroxide M(OH) 2 , is balanced by an equal negative charge from the interlayer solvated anions. The general formula for these compounds is [MII 1-x MIII x (OH) 2 ] x+ A mx/m .nH 2 O, where MII and MIII are divalent and trivalent cations, respectively, and A m-represents the interlayer anions.Tichit et al. [18] and Das et al. [19] have studied the effect of inclusion of tetravalent metal (Zr) into the hydrotalcite-like structures (Mg/Al) and (Zn/Al). Recently, we reported that the preparation of Zn-Ti LDH, Zn-Al-Ti LDH, Co-Ti LDH and Co-Zr-Si LDH consisting of di-and tetra-valent cations is possible [20][21][22][23].In the field of catalysis, layer compounds which include foreign atoms, ions, or complexes in between the layers are most commonly encountered. Clays and related silicates have attracted most of the attention concerning...

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Section: Scanning Electron Microscope (Sem)supporting

confidence: 91%

Section: X-ray Powder Diffractionsupporting

confidence: 88%

Section: Experimental Methods Materialsmentioning

confidence: 99%

Section: Intercalationmentioning

confidence: 99%

See 2 more Smart Citations

Preparation, Characterization and Intercalation Reactions of New Nano-Ordered Layered Materials, Zn-Al-Si LDH

Saber

2011

CNANO

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“…Their structures depend on brucite-like layers that possess di-and tri-valent cations in an order arrangement. [4,5] The coordination of hydroxyl groups with di-and tri-valent metals creates positive charges on their nanolayers that neutralize with anions among them. The main structure of these compounds is [MII 1-x MIII x (OH) 2 ] x + (A m ) xÀ /m .nH 2 O in which M(II), M(III) and A m are di-, trivalent cations and the interlayered anions; respectively.…”

Section: Introductionmentioning

confidence: 99%

Optimization Conditions for Crystal Growth of Novel Nanolayers, Nanohybrids and Nanocomposites Based on Cobalt, Zirconium, Titanium and Silicon

et al. 2019

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The present study has a triple aim for producing three novel nanostructures through incorporation of zirconium, titanium and silicon in the host layer of layered double hydroxides (LDH) beside cobalt. These four metals were designed in ordered structures for creating novel nanolayers inside LDH. By modifying these nanolayers with fatty acid, another novel nanohybrid material was produced. This nanohybrid contains 38% of inorganic species in addition to 62% of hydrocarbons fatty acid. In addition, the thermal treatment of the nanolayered structure converted the nanolayers of Co‐Si‐Zr‐Ti LDH to nanocomposites consisting of nanoparticles of cobalt oxide doped by triple dopants in an order manner: zirconium titanium and silicon. The crystals growth of Co‐Si‐Ti‐Zr LDH was studied from 9 h to 32 h through four stages. These stages were followed by different techniques. Finally, this study concluded that the nanolayered structure of Co‐Si‐Zr‐Ti, which is not yet published in the literature, could be formed with well‐crystallized phase. This novel 2D nanomaterial has positive impact to open the way for creating novel nanocomposites and nanohybrids.

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Catalytic activity and surface characteristics of layered Zn–Al–Si materials supported platinum

Saber

Gobara

Jaafari

2011

Applied Clay Science

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Nano-hybrid materials and nano-composite materials based on PVA

Cited by 3 publications

References 9 publications

Preparation, Characterization and Intercalation Reactions of New Nano-Ordered Layered Materials, Zn-Al-Si LDH

Preparation, Characterization and Intercalation Reactions of New Nano-Ordered Layered Materials, Zn-Al-Si LDH

Optimization Conditions for Crystal Growth of Novel Nanolayers, Nanohybrids and Nanocomposites Based on Cobalt, Zirconium, Titanium and Silicon

Catalytic activity and surface characteristics of layered Zn–Al–Si materials supported platinum

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