Electrodeposition of nanocrystalline Ni-Mo alloys from alkaline glycinate solutions

The induced electrodeposition of nanocrystalline Ni-Mo alloys was investigated using two different molar ratios of Ni:Mo in sodium glycinate solution at pH 9.3. The chemical nature of the Ni2+ and MoO4 2- in alkaline glycinate solution was studied using UV-Vis absorption spectroscopy. The composition of the coating layer was determined using EDX. The crystallinity of electrodeposits was examined using XRD, whereas, the morphology and topography were investigated using SEM and AFM, respectively. The corrosion resistance of Ni-Mo alloys compared to pure Ni was studied in 3.5 % NaCl solution using potentiodynamic polarization and electrochemical impedance techniques. Ni-Mo alloy electrodeposited from the solution containing [MoO4 2-]/[Ni2+] molar ratio of 0.2 show higher corrosion resistance compared to plating solutions of molar ratio 0.1 and pure Ni.NPRP Grant 4-306-2-111 from the Qatar National Research Fund (a Member of The Qatar Foundation).Scopu

Thermodynamic, viscoelastic and rheological structure-property relationships of rigid poly(vinyl chloride)-styrenic copolymer blends

Vita.In order to extend low temperature properties, rubber modification of PVC is commonly employed. The upper use temperature is however still restricted. To counter this problem modification using higher glass transition polymers is reviewed. As opposed to using a high Tg polymer, copolymers are investigated with the aim of improving the net intereaction energy between the two systems. The polymers are a low molecular weight styrene acrylonitrile and a high molecular weight alpha methyl styrene acrylonitrile. The binary systems thus compose of two glassy polymers and they are reviewed for property improvement based on modulus-temperature curves as well as employing a time-acceleration scheme which hitherto has been primarily applied to single phase systems. Relationships between the activation energy (of the a transition)- composition and the storage modulus-temperature-composition relationships are examined to determine means to optimize the systems. Based on preliminary evidence of a marked solvent effect in the systems, departure from ternary solvent generated systems is ensured by using compression molded systems. The morphology of the compression molded samples is examined using the Scanning Electron Microscope and the Transmission Electron Microscope. Susceptibility to change in flow is also examined through the use of an Instron Capillary Rheometer and Parallel Plate Rheometer

Thermodynamic, viscoelastic and rheological structure-property relationships of rigid poly(vinyl chloride)-styrenic copolymer blends

Vita.In order to extend low temperature properties, rubber modification of PVC is commonly employed. The upper use temperature is however still restricted. To counter this problem modification using higher glass transition polymers is reviewed. As opposed to using a high Tg polymer, copolymers are investigated with the aim of improving the net intereaction energy between the two systems. The polymers are a low molecular weight styrene acrylonitrile and a high molecular weight alpha methyl styrene acrylonitrile. The binary systems thus compose of two glassy polymers and they are reviewed for property improvement based on modulus-temperature curves as well as employing a time-acceleration scheme which hitherto has been primarily applied to single phase systems. Relationships between the activation energy (of the a transition)- composition and the storage modulus-temperature-composition relationships are examined to determine means to optimize the systems. Based on preliminary evidence of a marked solvent effect in the systems, departure from ternary solvent generated systems is ensured by using compression molded systems. The morphology of the compression molded samples is examined using the Scanning Electron Microscope and the Transmission Electron Microscope. Susceptibility to change in flow is also examined through the use of an Instron Capillary Rheometer and Parallel Plate Rheometer

Metal Hydroxide Derivatives Containing Chemically Bound Organophosphorus or Polyphosphate Species as Flame Retardants

Patent relating to metal hydroxide derivatives containing chemically bound organophosphorus or polyphosphate species as flame retardants

Novel Metal Hydroxide Derivatives Containing Chemically Bound Organophosphorus or Polyphosphate Species as Flame Retardants

Patent relating to novel metal hydroxide derivatives containing chemically bound organophosphorus or polyphosphate species as flame retardants

Preface

A path for creating an advanced society is being paved with nanotechnology, which is a transformational path for Industry 4.0. It contributes benefits in many important domains, including medicine, energy, environmental protection, construction, etc. Advances in nanoscience increase our knowledge of materials on a smaller scale, particularly their fundamental physical, chemical, and biological properties that differ from their aggregate forms. Scientists and engineers will manufacture next-generation materials for a better future by understanding of these nanoscale properties. In this special issue of Emergent Materials journal entitled "Women in Nanotechnology," we emphasize the work of research groups run by women scientists worldwide.Scopu

The effect of Zn, Al layered double hydroxide on thermal decomposition of poly(vinyl chloride)

Poly(vinyl chloride)/layered double hydroxide (LDH) composite was prepared by mixing 4 wt% Zn2Al-CO3-LDH with PVC and fluxing at 180 degrees C. The thermal decomposition behaviour of the LDH + PVC composite in air and nitrogen environments was systematically investigated. We found that mixing Zn2Al-CO3-LDH into PVC facilitates dehydrochlorination from ca. 300 to 270 degrees C but reduces the reaction extent to leave more chlorine on the polyene backbones both in air and N-2. We have also found that at 400 - 550 degrees C, both in air and N-2, LDH assists the formation of char-like materials and decreases the release of volatile hydrocarbons. From 550 to 800 degrees C, the char-like materials are mostly retained in N-2 while they are almost completely thermo-oxidized (burned) in air. Thus, addition of Zn2Al-CO3-LDH to PVC does not increase the thermal stability, but does promote charring to retard the generation of flame. The influence of LDH on PVC thermal properties has been also addressed mechanically. (c) 2006 Elsevier Ltd. All rights reserved

Influence of Bath Composition at Acidic pH on Electrodeposition of Nickel-Layered Silicate Nanocomposites for Corrosion Protection

This article describes how nickel-layered silicate nanocomposite films were electrochemically deposited using pulsed potentiostatic conditions from an acidic plating bath containing exfoliated layered silicate to enhance adhesion to the substrate, corrosion resistance, and mechanical properties

Salt water corrosion resistance of electrodeposited Ni-layered silicate nanocomposite coatings from Watts' type solution

Pure nickel and nickel-montmorillonite (Ni-MMT) composite coatings were produced using pulse current electrodeposition from Watts' type solution. Experimental results show that the codeposition of MMT particles into the Ni matrix improves the microhardness of the coatings and modifies the [100] texture of pure Ni deposits to a mixed crystal orientation through [100] and [211] axes. Ni-MMT composite coatings show improved corrosion resistance in simulated seawater as compared to pure Ni as revealed from electrochemical polarization and impedance measurements. SEM and AFM micrographs indicate a reduction in the Ni crystallite grain size and increase in the surface roughness of the film as a result of embedding of MMT particles in the Ni matrix.NPRP Grant 4-306-2-111 from the Qatar National Research Fund (a Member of The Qatar Foundation).Scopu