Electrical, Optical, and Scanning Tunneling Microscopic Studies on Layer Type CdIn2S4-xSex (1.75 ≤ x ≤ 2.75)

Srivastava, S. K.; Pramanik, Monoj; Palit, Debashis; Mathur, B. K.; Kar, A. K.; Ray, Bishwajit; Haeuseler, H.; Cordes, W.

doi:10.1021/cm0110829

Cited by 31 publications

(21 citation statements)

References 34 publications

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“…Furthermore, it is also observed that peaks are asymmetric at the lower angle than on the higher angle regions. It is well known that such asymmetric behavior of MMT peak in the presence of MWCNT could be attributed to the introduction of layer disorder in MMT . Imperfection of crystallite as a result of lattice strain, dislocation, and stacking faults are also known to contribute toward the broadening of X‐ray diffraction peak of MMT/MWCNT.…”

Section: Resultsmentioning

confidence: 99%

Synergistic effect of carbon nanotubes and clay platelets in reinforcing properties of silicone rubber nanocomposites

Pradhan

Roy

Srivastava

et al. 2015

J of Applied Polymer Sci

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Fine powders of montmorillonite (MMT)/multiwalled carbon nanotube (MWCNT) hybrids have been prepared by simple grinding of MWCNT with MMT in different weight ratios of MMT to MWCNT (10 : 1, 6 : 1, 3 : 1, 1 : 1, and 1 : 3) and characterized by wide-angle X-ray diffraction, field emission scanning electron microscopy, and transmission electron microscopy. These studies have established the formation of the exfoliated structures of MMT/MWCNT (1 : 1) hybrid, in which MWCNTs exist in the state of single nanotubes that are adsorbed and intercalated on the surface and in between the MMT nanoplatelets. The hybrid has subsequently been used as reinforcing nanofiller in the development of high-performance silicone rubber (SR) nanocomposites, and a remarkably synergistic effect of MMT and MWCNT on SR properties has been observed. The tensile strength of SR containing 1% w/ w of the MMT/MWCNT (1 : 1) hybrid is improved by 215%, whereas the SR filled with MMT or MWCNT alone showed an improvement of 46 and 25%, respectively, over that of unfilled SR. In addition, SR/1 wt % MMT/MWCNT (1 : 1) nanocomposites also exhibit the maximum improvement in thermal stability corresponding to 10% weight loss by 70 C, crystallization and melting temperatures increased by 8 and 6 C as inferred from thermogravimetric analysis and differential scanning calorimetry, respectively. This approach is promising for the preparation of high-performance SR nanocomposites by using different dimension nanofillers together.

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Section: Resultsmentioning

confidence: 99%

Synergistic effect of carbon nanotubes and clay platelets in reinforcing properties of silicone rubber nanocomposites

Pradhan

Roy

Srivastava

et al. 2015

J of Applied Polymer Sci

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“…[12][13][14][15][16][17][18] Clay minerals have been extensively used as a reinforcing agent because of their low cost and easy availability 14,19,20 compared to other layered materials. [21][22][23] Especially, naturally occurring sodium montmorillonite (Na + -MMT) has 2:1 layered silicates. The crystal lattice of Na + -MMT consists of a central octahedral sheet of alumina/magnesium sandwiched between two fused tetrahedral sheets.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of montmorillonite (MMT) using column chromatography technique and its application in silicone rubber nanocomposites

2011

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Surface modification of montmorillonite (MMT) was done to improve the basal spacing using a column chromatography technique with quaternary long chain ammonium salt as an intercalent. An increase in d-spacing of organically modified montmorillonite (OMMT) was confirmed by X-ray diffraction and found to increase from 16 to 22 Å. The d-spacing was maximal (22 Å) due to ion exchange column of sufficient length (35 cm) and diameter (5 cm), which provides maximum retention time for proper ion exchange between MMT and ion-exchange resin. OMMT: silicone nanocomposites were prepared by solution blending and then compounded and molded on two roll mill and compression molding machines, respectively. The amount of loading of OMMT was in the range of 2-10 wt%. The rubber chains were uniformly dispersed within and between the exfoliated OMMT plates. The extent of dispersion was measured using atomic force microscopy. The mechanical, thermal, and physical properties were studied. Increased amounts of OMMT loading showed increased silicone:OMMT nanocomposite properties compared to those of pristine silicone rubber due to OMMT exfoliation and uniform dispersion with good wet ability of the rubber chains.

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“…[3,4] The degree of improvement of polymeric properties is extremely dependent on the degree of dispersion of aluminosilicate layers in the polymer matrix, i.e., it is directly dependent on the size of the clay particles dispersed; [5] as a result, either intercalated nanocomposites in which the polymer chains are inserted regularly in between the clay layers or delaminated nanocomposites where silicate layers are randomly dispersed in the polymer matrix or partially delaminated nanocomposites where there is the existence of both these configurations may be emerged out. Sodium montmorillonite (Na þ -MMT), an inorganic material with layered structure, [6][7][8] consists of negatively charged silica sheets held together by charge balancing counter ions Na þ . These counter ions in Summary: Ethylene vinyl acetate (EVA) copolymer/dodecyl ammonium ion intercalated montmorillonite (12Me-MMT) nanocomposites were swelled in xylene under atmospheric condition.…”

Section: Introductionmentioning

confidence: 99%

Exertion of Inhibiting Effect by Aluminosilicate Layers on Swelling of Solution Blended EVA/Clay Nanocomposite

Pramanik

Acharya

Srivastava

2004

Macro Materials & Eng

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Summary: Ethylene vinyl acetate (EVA) copolymer/dodecyl ammonium ion intercalated montmorillonite (12Me‐MMT) nanocomposites were swelled in xylene under atmospheric condition. Swelling index of these nanocomposites decreased with filler loading indicating that the solvent uptake of these nanocomposites was inversely related to the filler contents. The volume fractions of nanocomposites showed an increasing trend with filler concentration because of unswelling effect exerted by aluminosilicate layers. The cross‐link density was determined using the Flory‐Rehner equation and it was observed that the cross‐link density of these nanocomposites also showed an increasing trend with increasing filler loading. Free energy change (ΔGmix) and the change in entropy (ΔSmix) on swelling of EVA/12Me‐MMT nanocomposites in xylene were calculated and these values reaffirmed that the interaction between polymer chains and silicate layers was very strong which induced remarkable inhibiting ability on EVA matrix when swelled in xylene.TEM photograph of EVA/12Me‐MMT nanocomposite containing 8 wt.‐% 12Me‐MMT.magnified imageTEM photograph of EVA/12Me‐MMT nanocomposite containing 8 wt.‐% 12Me‐MMT.

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Electrical, Optical, and Scanning Tunneling Microscopic Studies on Layer Type CdIn₂S_4-_xSe_x (1.75 ≤ x ≤ 2.75)

Cited by 31 publications

References 34 publications

Synergistic effect of carbon nanotubes and clay platelets in reinforcing properties of silicone rubber nanocomposites

Synergistic effect of carbon nanotubes and clay platelets in reinforcing properties of silicone rubber nanocomposites

Surface modification of montmorillonite (MMT) using column chromatography technique and its application in silicone rubber nanocomposites

Exertion of Inhibiting Effect by Aluminosilicate Layers on Swelling of Solution Blended EVA/Clay Nanocomposite

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