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Patent
Auxetic Technologies Ltd. and The Composites Group | Date: 2010-04-30

An auxetic knitted fabric, comprising an auxetic component knitted from at least a first type of fibre, and a stabilising component knitted from at least a second type of fibre, wherein the first and second fibre types have different mechanical properties.


Saha D.,The Composites Group | Payzant E.A.,Oak Ridge National Laboratory | Kumbhar A.S.,University of North Carolina at Chapel Hill | Naskar A.K.,The Composites Group
ACS Applied Materials and Interfaces | Year: 2013

Here, we report the synthesis of surfactant-templated mesoporous carbons from lignin, which is a biomass-derived polymeric precursor, and their potential use as a controlled-release medium for functional molecules such as pharmaceuticals. To the best of our knowledge, this is the first report on the use of lignin for chemical-activation-free synthesis of functional mesoporous carbon. The synthesized carbons possess the pore widths within the range of 2.5-12.0 nm. In this series of mesoporous carbons, our best result demonstrates a Brunauer-Emmett-Teller (BET) surface area of 418 m2/g and a mesopore volume of 0.34 cm3/g, which is twice the micropore volume in this carbon. Because of the dominant mesoporosity, this engineered carbon demonstrates adsorption and controlled release of a representative pharmaceutical drug, captopril, in simulated gastric fluid. Large-scale utilization of these sustainable mesoporous carbons in applications involving adsorption, transport, and controlled release of functional molecules is desired for industrial processes that yield lignin as a coproduct. © 2013 American Chemical Society.


Williams S.L.,The Composites Group
International SAMPE Technical Conference | Year: 2015

DIAB's Divinycell F is a novel polyether sulfone (PES) thermoplastic structural foam core material with high temperature capabilities: processing temperature up to 212 °C; operating temperature up to 205 °C. The PES thermoplastic polymer has excellent fire, smoke and toxicity properties, exceeding requirements for commercial aircraft interior spaces. Four foam densities, ranging from 40 kg/m3 to 130 kg/m3 were characterized at various environmental conditions with respect to compression, shear and tensile properties to establish B-Basis design allowables. Processing characteristics of the PES foam core were also determined for suitability in processes including autoclave cure, resin infusion and thermoforming. In addition, sandwich panels constructed with the novel PES foam core materials were characterized and compared to panels constructed with other common aerospace core materials: honeycomb core and polymethacrylimide foam core. The sandwich panels were characterized with respect to composite sandwich beam flexure, climbing drum peel, impact, acoustic, and dielectric properties. Copyright 2015. Used by the Society of the Advancement of Material and Process Engineering with permission.


Polycrystalline layered structure SrBi4Ti4O15 (SBT) ferroelectric ceramics were synthesized via the solid-state reaction method. The high energy mechanochemical processing resulted in nanometer sized particles of SBT phase. The complete phase formation of layered structure SBT was observed after calcination at 800 °C. Highly dense SBT ceramics were obtained after sintering at 1200 °C in an oxygen atmosphere. The presence of oxygen during sintering reduced the porosity and dense microstructures were obtained. The density was found to be >96% of theoretical density. The phase formations in steps from milled to sintered were observed from XRD pattern and the SEM micrograph exhibited platelet-like morphology of SBT. TEM was done to estimate the particle size of the powders. Electrical properties of SBT ceramics viz. dielectric, piezoelectric charge coefficient and ferroelectric hysteresis measurements were made. Resonance measurements were made in order to determine the electromechanical coefficient and elastic compliances. The results of all of the aforementioned are presented in this paper. © 2014 Elsevier Ltd and Techna Group S.r.l.


Mahesh M.L.V.,The Composites Group | Bhanu Prasad V.V.,The Composites Group | James A.R.,The Composites Group
Journal of Alloys and Compounds | Year: 2014

Nano-sized zirconium substituted barium titanate, Ba(Zr 0.15Ti0.85)O3, hereinafter referred to as BZT was synthesised using high energy ball milling. Calcined powders were compacted using cold-isostatic pressing. Phase pure perovskite BZT, free from any secondary peaks was observed for sintered samples with a relative density ∼98%. High permittivity of ∼14,000 coupled with a dielectric loss of <2% were measured on these samples. A high remanent polarization of ∼10 μC/cm2 and an electric field induced unipolar strain of 0.1% at relatively low fields (∼40 kV/cm) at room temperature are other characteristic highlights of these ceramics. The effect of hysteresis parameters such as voltage, frequency and temperature on the polarization and electric field induced strain are also reported in this paper. The observed enhanced dielectric, ferroelectric and piezoelectric properties can be a result of the contribution of all polar vectors of various coexisting phases at the composition studied and are comparable to single crystals of the same composition. © 2014 Elsevier B.V. All rights reserved.


Trademark
The Composites Group | Date: 2016-11-15

Glass panels, namely, bullet resistant fiberglass.


Trademark
The Composites Group | Date: 2015-07-20

Glass panels, namely, bullet resistant fiberglass.


Trademark
The Composites Group | Date: 2015-07-28

Glass panels, namely, bullet resistant fiberglass.


A

Trademark
The Composites Group | Date: 2015-07-20

Glass panels, namely, bullet resistant fiberglass.


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