Volume 4, Issue 9, September 2013

Advanced Materials World Congress, Turkey

Ashutosh Tiwari

Advanced Materials Letters, 2013, Volume 4, Issue 9, Pages 655-655
DOI: 10.5185/amlett.2013.9001

We are glad to organise Advanced Materials Word Congress (AMWC, http://www.amwc2013.org/) together with the International Association of Advanced Materials (www.iaamonline.org) and hosted by the Ä°zmir Institute of Technology in the beautiful coastal town ÇeÅŸme, Turkey at Altinyunus Hotel ÇeÅŸme during 16-19 September, 2013. The goal of congress is to provide a global platform for researchers and engineers coming from academia and industry to present their research results and activities in the field of materials science and engineering with a special attention on interdisciplinary research of advanced materials. The conference will provide opportunities for the delegates to exchange their face-to-face novel ideas and experiences with the international experts during plenary & invited talks, oral presentations and poster sessions. We will set up ten sessions with keynote forum, panel discussion and project negotiation. The full article of presentations will be published in the special issue of Advanced Materials Letters.

Spectroscopic And Morphological Analysis Of Graphene Vinylester Nanocomposites

Anupama Chaturvedi; Ashutosh Tiwari; Atul Tiwari

Advanced Materials Letters, 2013, Volume 4, Issue 9, Pages 656-661
DOI: 10.5185/amlett.2013.4469

This communication describes the development of graphene and graphene reinforced polyvinylester nanocomposites. Low concentration of graphene was incorporated in the polymer matrix with the help of two different solvents. The role of solvent in the nanocomposite was studied. The FTIR spectroscopy and electron microscopy have supported the presence of graphene in the nanocomposites. It was discovered that vehicular medium (i.e., solvent) plays a vital role in the properties of the ultimate nanocomposites. When dimethylacetamide was used as solvent, the morphological analysis suggested the increased toughness while in case when tetrahydrofuran was used as solvent, nanocomposite appeared brittle in nature.

Synthesis Of ZnO Nanoparticles For Microwaveinduced Rapid Catalytic Decolorization Of Congo Red Dye

Oman Zuas; Harry Budiman; Nuryatini Hamim

Advanced Materials Letters, 2013, Volume 4, Issue 9, Pages 662-667
DOI: 10.5185/amlett.2012.12490

The ZnO nanoparticles (ZnO NPs) were synthesized by co-precipitating method followed by calcining at 500 o C for 4 h. The characterization data show that the synthesized ZnO NPs were present in hexagonal wurtzite structure and space group P63mc with high purity and good crystalline nature. The synthesized ZnO NPs were tested for decolorization of congo red (CR) dye under microwave irradiation using microwave induced catalytic (MIC) method. The investigation results showed that the microwave induced ZnO NPs process could effectively decolorize the CR dye with the efficiency approaches 90.63% in a short contact time under given condition of 10 mg/l CR dye, 300 watt of microwave power, 3 min of contact time, and 3 g/l of catalyst dosage. Since the microwave-induced catalytic process in this study is noticeable, the microwave technology coupled with ZnO NPs as catalyst may have synergistic effects on the decolorization of CR dye giving high degradation ratio in short reaction time. Therefore, the microwave technology can be used as an alternative option to enhance the catalytic activity of metal nanoparticles dealing with removal of various industrial dyes containing wastewater.

Experimental Finding Of Initiation Fracture Toughness And FEM Simulation Of Fracture Behaviour Of UFG 7075 Al Alloy

Prosenjit Das; R. Jayaganthan; I. V. Singh

Advanced Materials Letters, 2013, Volume 4, Issue 9, Pages 668-681
DOI: 10.5185/amlett.2013.2417

The present work describes an experimental evaluation of yield strength, tensile strength, initiation fracture toughness and Finite element simulations of fracture behaviour for both bulk and ultrafine-grained (UFG) 7075 Al Alloy. The 7075 Al alloy has been rolled for different thickness reductions (40%, 70% and 90%) at cryogenic (liquid nitrogen) temperature, and its mechanical properties and microstructural morphology have been investigated. Rolling of the Al alloy at cryogenic temperature suppresses the dynamic recovery and grain growth, which leads to grain fragmentation. Dislocation cells formed during consecutive rolling passes, transformed into fully formed UFG (600 nm) up to 70% thickness reduction. Grain size gets reduced further when 90% thickness reduction is achieved. Incremental crack growth simulations have been carried out by commercial software ABAQUS under quasi-static loading using deformation plasticity theory based on Griffith energy concept. J-integral, stress along crack path, effect of crack and specimen size over J-integral, stress distribution and plastic dissipation ahead of the crack tip have been investigated for some practical crack problems under mechanical and thermo-mechanical loading. The numerical examples indicates a significant enhancement in crack arrest capabilities of UFG alloys for the same boundary conditions because of decreasing J values with increasing % thickness reduction. This is attributed to the improved mechanical properties (UTS: 625 MPa and YS: 610 MPa) of the cryorolled alloy which hinders the onset of plasticity, results from ultrafine-grain formation.

Magnetic Study Of Nano-crystalline Cobalt Substituted Mg-Mn Ferrites Processed Via Solution Combustion Technique

Gagan Kumar; Ritu Rani; Vijayender Singh; Sucheta Sharma; Khalid M. Batoo; M. Singh

Advanced Materials Letters, 2013, Volume 4, Issue 9, Pages 682-687
DOI: 10.5185/amlett.2013.1409

Co 2+ substituted Mg-Mn nanoferrites having formulae Mg0.9Mn0.1CoxFe2-xO4, where x = 0.0, 0.1, 0.2 & 0.3, have been prepared for the first time by solution combustion technique. The magnetic properties of nanoferrites such as M-H, initial permeability (μi) and magnetic loss tangent (tan δ) have been investigated as a function of frequency in the range 700 Hz to 30 MHz. X-ray diffraction patterns confirmed the formation of single phase spinel structure of all the nanoferrites. The surface morphology of the samples is studied by using scanning electron microscopy (SEM), while elemental compositions of samples are studied by energy dispersive X-ray analysis (EDAX). Saturation magnetization (Ms) and magneto-crystalline anisotropy constant (K1) are found to be increasing with an increase in cobalt content while initial permeability and magnetic loss tangent are found to be decreasing with an increase in frequency as well as with the increasing concentration of Co 2+ ions. The very low values of magnetic loss tangent even at high frequencies are the prime achievements of the present work.

Synthesis, Characterization And Catalytic Activity Of Transition Metal Complexes Of Ascorbic Acid Encapsulated In Fly Ash Based Zeolite

T. Peter Amaladhas; S. Sheeba Thavamani

Advanced Materials Letters, 2013, Volume 4, Issue 9, Pages 688-695
DOI: 10.5185/amlett.2013.1406

A new route for the utilization of fly ash has been formulated. X-type zeolite has been synthesized from fly ash by alkali fusion followed by hydrothermal treatment. Ascorbic acid was used as a ligand for the synthesis of metal complexes of copper, nickel and vanadium encapsulated in the super cages of fly ash based zeolite (FAZ) by flexible ligand method and characterized by FTIR, XRD, Atomic Absorption Spectrometry (AAS), Ultra Violet–Visible spectroscopy and Thermo gravimetric analysis (TGA). The additional peaks corresponding to that of the complex have been observed which confirms the loading of the metal complexes in the zeolite cavities. The shifting of C=C-O stretching frequency found at 682 cm -1 in ascorbic acid to 601 cm -1 confirms the co-ordination of the ligand resulting in the formation of the metal complex. The thermo grams show deflation in three regions corresponding to the loss of the intra-zeolite water, metal complexes and the structural –OH group respectively. The catalytic activity of these complexes towards the liquid phase hydroxylation of phenol with hydrogen peroxide has been established. The extent of the reaction as a function of time has been investigated. Vanadium-ascorbate complex had the highest conversion of 78%. The product was identified as hydroquinol by GC-MS. This study reports a highly attractive catalytic method for the preparation of hydroquinol from phenol using aqueous hydrogen peroxide as the oxidising agent which is industrially significant. 

Effect Of Morphology On Thermal Stability Of Core-shell Polyaniline/TiO2 Nanocomposites

Ameena Parveen; Aashis S. Roy

Advanced Materials Letters, 2013, Volume 4, Issue 9, Pages 696-701
DOI: 10.5185/amlett.2012.12481

Polyaniline/TiO2 nanocomposites have been prepared by sol-gel technique using citric acid and saturated solution of α-dextrose as a surfactant in presence of hydroxyl group at an anomeric position in sugar chain. The FTIR spectrum indicates the benzenoid, quinoid and MO peaks confirm the formation of PANI/TiO2 nanocomposites. The XRD studies show the monoclinic structure and the TEM study of nano TiO2 reveals that the average particles size is 9 ±2 nm whereas the composite size is 13 ± 2 nm and further it is observed that the TiO2 nanoparticles are intercalated to form a core shell of PANI. The formation of core shell is significant up to 30wt% observed from the SEM. The TGA-DSC curves show the thermal stability of polyaniline and its nanocomposites at 660 °C of temperature.

Facile Synthesis Of Eco-friendly Cu-hydrotalcite Catalysts For Highly Selective Synthesis Of Furfural Diethyl Acetal And Benzoin Ethyl Ether

Kai Yan; Jiayou Liao; Xu Wu; Xianmei Xie

Advanced Materials Letters, 2013, Volume 4, Issue 9, Pages 702-707
DOI: 10.5185/amlett.2013.2419

A series of eco-friendly Cu-hydrotalcite (HT) catalysts (Cu-Fe, Cu-Al, Cu-Cr) were facilely and successfully synthesized by a modified co-precipitation method. The as-prepared Cu-hydrotalcite catalysts were highly selective for the synthesis of Anchorvalue-added furfural diethyl acetal and Anchorbenzoin ethyl ether, whereas furfural diethyl acetal (97.5% selectivity at 49.3% conversion of furfural) and benzoin ethyl ether (98.4% selectivity at 43.7% conversion of benzaldehyde) were highly selectively produced on the Cu-Fe hydrotalcite catalyst, respectively. AnchorThe eco-friendly Cu-hydrotalcite catalysts were easy to be recycled and maintained high stability, which may be a good candidate for the general application in the reaction of aldehyde and ethanol.

Polypropylene-nanoclay Composites Containing Flame Retardant Additive: Thermal Stability And Kinetic Study In Inert Atmosphere

Narender Kumar; J. B. Dahiya

Advanced Materials Letters, 2013, Volume 4, Issue 9, Pages 708-713
DOI: 10.5185/amlett.2013.1412

Thermal degradation and stability of polypropylene-nanoclay composites containing organic phosphinate (OP) and ammonium polyphosphate (AP) flame retardants with maximum total 20 per cent loading was carried out using thermogravimetry (TG) and differential scanning calorimetry (DSC) analyses in inert atmosphere. Kinetic methods such as Broido, Horowitz-Metzger and Coats-Redfern were applied to study the mechanism of degradation of materials. The thermal stability of PP/PPgMA/AP/15A nanocomposite containing total 20 per cent loading is increased by 20 o C in comparison to that of control sample and also gives high char yield (14.4 %) due to presence of exfoliated clay and phosphorylating effect of AP in condensed phase. The random nucleation (first order) mechanism is found the most probable mechanism for PP composites degradation from kinetic study. The future prospective of the study is to develop superior fire safe polymeric materials.

Preparation And Characterization Of Cellulose Derived From Rice Husk For Drug Delivery

S. K. Shukla; G. C. Dubey;Ashutosh Tiwari; Anand Bharadvaja

Advanced Materials Letters, 2013, Volume 4, Issue 9, Pages 714-719
DOI: 10.5185/amlett.2013.2415

Cellulose has been the extracted from rice husk by chemical treatment with aqueous solution of sodium hydroxide. The physical properties of derived cellulose (water uptake and swelling behavior) has been investigated with view of different applications. The morphology and chemical structure were investigated by Infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM) and Thermogravimetry (TG) techniques. The results revealed the formation of homogeneous porous (micro size) membrane. Further, the UV-vis spectra of cellulose in different pH shows its responsiveness towards hydronium ion, which is suitable for drug delivery. Further, obtained cellulose was used for drug delivery under optimized pH.