Deakin Research

Institute for Frontier Materials

IFM research seminar series 2012

Blue star - Professional development  Professional development
Purple star - external presentation External presentation

These research seminars are held in the GTP Conference Room (na1.014)

Date Time Presenter Presentation/topic
Friday October 26 10 am Associate Professor Rongzheng Wan (Shanghai Institute of Applied Physics, Chinese Academy of Sciences) Purple star - external presentation Simplified molecular dynamics models to simulate water flow in carbon nanotubes mimicking aquaporin 

11 am Yang Choon Lim Purple star - external presentation Surface-stress-based Microcantilever Aptasensor 

 Abstract

Biosensors is a device that is capable of providing qualitative and/or quantitative information of biomolecular interactions via coupling of biological recognition element to a transducer. A biosensor consists of two main components: a sensing layer and a transducer. The sensing layer is usually made up of bioreceptors and antibodies are commonly used for biomolecule detection. However, antibodies are unstable, very tedious and costly to produce. Aptamers which are synthetic nucleic acids exhibit superior specificity to antibodies due to their small size and better physicochemical stability. Furthermore, they are less susceptible to denaturation, and have less batch variation and long storage life. These advantages have spurred the development of aptamer-based biosensors known as aptasensors. Successful interaction event between the bioreceptors and target molecules at the sensing layer is then converted to measurable electronic signals via the transducer component. Microcantilever-based aptasensors are deemed to offer one of the best biological transduction methods due to their inherent advantages such as small size, low sample volume, label-free detection, ease of integration, high-throughput analysis, and low development cost. This research involves the design and development of a microcantilever-based aptasensor employing SU-8 polymer as the fabrication material. The work is carried out in four stages: (i) design of the aptasensor, (ii) modelling and simulation of the aptasensor, (iii) fabrication of the aptasensor using surface micromachining, (iv) aptasensor surface modification and immobilisation, and (iv) characterization and evaluation of the aptasensor using thrombin molecules.

Thursday October 4 10 am Yongning Liu (School of Materials Science and Engineering, Hefei University of Technology) Purple star - external presentation Numerical Simulation of the Compound Casting Process between Mg Alloy Liquid and Al Alloy Solid 

 Abstract

The alloys of Al and Mg are widely used in the industry. As the main lightweight alloy, they have many excellent properties, such as low density, high ductility, and high specific strength and so on. For these properties, the Mg alloy is better than Al alloy. However, the corrosion of Mg alloy occurs more readily than with the Al alloy, the strength is lower and the post-processing is also more complex. Thus a solution to this problem is to use compound casting to make these two alloys unite to satisfy the requirements from industry. In this study the distribution of residual stresses in the compound casting is determined by numerical simulation. With the increasing of temperature of substrate, residual stresses increase, and the x-direction stresses in the substrate and in the deposit are compressive and tensile, respectively. With the increasing of thickness of deposit, the residual stress in the substrate increases, while they decrease in the deposit. Furthermore, the stresses concentrate near the edge of deposit, which eventually lead to failure of the deposit. In addition, we also use Computational Fluid Dynamics (CFD) that adopts the volume of fluid (VOF) method to study the impact mechanism, and the spreading of the liquidized Mg alloy in the surface of solid Al alloy. The impact process can be described by several steps: spreading step, retracting step, oscillating step, and equilibrium step. We also investigate some main parameters that influence the quality of compound casting products: impact velocities, initial diameter of the droplet, and the temperature of the substrate. We find that the spread diameter of the drop on the substrate changes when the impact velocity and initial diameter of drop are varied. While the impact velocities and initial diameters of drop are larger than the critical value, the liquid may part or appear the bubbles in the film. The higher the temperatures of substrate are, the larger the spread diameters; and they will take more time for oscillating step and equilibrium step to complete.

Wednesday Oct 3 11 am Steve Christensen (Technical Fellow, Boeing, USA) Purple star - external presentation Carbon Fiber Research at Boeing 

 Abstract

Mr Christensen has been employed by Boeing since 1975 and in the aerospace industry for over 35 years. Assignments have included materials development for the B-1, 757, 767, Advanced Tactical Fighter (now F-22), numerous special projects and the Joint Strike Fighter. Research emphasis since mid-1990's has been on the development of a deformation based understanding of composite constituent materials performance with emphasis on improving polymer distortion deformation as the key to increased composite performance. Since 2003 I have been working to adopt computational methods such as quantum mechanics and molecular dynamics to further understand the structure-property relationships of carbon fibers and the associated polymer matrix materials.

Friday September 28 10 am Sreekumar Veedu Purple star - external presentation Structure Properties of Special Acrylic Fibre and Carbon Fibre 

Friday September 21 10 am Dr Yang Xing (Singapore membrane technology center - SMTC, Nanyang Technological University - NTU) Purple star - external presentation Dr YANG Xing's research work 

Friday September 4 10 am Badar Munir Zaidi What are the best preform structure and composite manufacturing parameters for filament winding and pultrusion processes? 

 Abstract

There has been a growing interest in recent years in the use of natural fibres as reinforcement in the composites because of high specific properties, low mass, environmentally friendly and ability to be incinerated for energy recovery. Natural fibres are normally used in two different forms for composite manufacture i.e. random discontinuous fibres and aligned continuous form. Natural fibre composites made from random discontinuous fibres have low strength and cannot be used for applications where high strength is needed [2]. To be able to use these fibres in structural applications, the fibres must be used in aligned continuous form. These must be converted to a yarn of required properties as per the end application requirements. Besides the required yarn structure, to use these fibre composites for structural applications, these fibres must be strategically placed according to the strength requirements of composites parts and the composite manufacturing process. To address this issue, the first aim of this study is set as follows:

Friday September 7 10 am Chris Rawson (Deakin Library Services) Blue star - Professional development 

10.30 am Akbar Abvabi Using the Solid-shell Element to Model the Roll Forming of Large Radii Profiles 

 Abstract

Roll forming is an incremental bending process for forming metal sheet, strip or coiled stock. Although Finite Element Analysis (FEA) is a standard tool for metal forming simulation, it is only now being increasingly used for the analysis of the roll forming process. This is because of the excessive computational time due to the long strip length and the multiple numbers of stands that have to be modelled. Typically a single solid element is used through the thickness of the sheet for roll forming simulations. Recent investigations have shown that residual stresses introduced during steel processing may affect the roll forming process and therefore need to be included in roll forming simulations. These residual stresses vary in intensity through the thickness and this cannot be accounted for by using only one solid element through the material thickness; in this work a solid-shell element with an arbitrary number of integration points has been used to simulate the roll forming process. The system modelled is that of roll forming a V-channel with dual phase DP780 sheet steel. In addition, the influence of other modelling parameters, such as friction, on CPU time is further investigated. The numerical results are compared to experimental data and a good correlation has been observed. Additionally the numerical results show that the CPU time is reduced in the model without friction and that considering friction does not have a significant effect on springback prediction in the numerical analysis of the roll forming process.

Thursday August 23 3.30 pm Luc Salvo, Prof (Grenoble University - CNRS - SIMAP) Purple star - external presentation Fast and ultra fast in situ 3D imaging using micro-tomography : application in material science 

 Abstract

3D characterisation of materials has always been the dream of researcher especially in the field of material science. Thanks to micro-tomography it is possible to obtain 3D images in a non destructive manner since 1995 using synchrotron sources and since 2002 with laboratory tomograph. The main progresses that have been achieved these last years with synchrotron sources are the reduction in the time to acquire a full 3D image keeping a spatial resolution of the order of 1 micron. This allows performing what we call fast-tomography and therefore 3D in situ experiments in various field of material science : phase transformation, damage during thermomechanical testing ... During this presentation we will first show that 3D in situ characterisation is sometimes mandatory. Then we will present the main characteristics of tomography and requirements for in situ micro-tomography. We will after show several examples where in situ tomography can provide interesting information in the field of solidification and damage in materials. Concerning solidification we will focus on intermetallics nucleation and growth in Al-Si-Cu-Fe alloys and hot tearing phenomenon in Al-Cu alloys. Concerning damage in materials we will focus on high temperature damage in AZ31 alloy during superplasticity. Finally we will present the limitation of fast tomography and the benefit of ultra fast tomography in which acquisition time lower than 1s for a full 3D image are obtained.

Friday Aug 10 10 am Infant Bosco Reinforce Natural Self Repair Oxides to Protect Steel System From Corrosion 

 Abstract

Protecting steel from corrosion is of high industrial importance. The current methodology involves using conversion coatings to form a protective passive film over steel. Iron corrosion products themselves can form a passive layer and serve as an alternative to the coating based passive film if this passivation can be controlled. The coating based passive film has the unique ability to self-repair itself at defects and sites of localised corrosion. This project aims to identify strategies to make the oxides of iron self-repairing by embedding some repair agents to the outer porous layer or at the metal/oxide interface from the system and to build the theoretical framework to guide identification of repair strategies.

Thursday Aug 9 10 am Prof Pierre-Yves Manach (Universite de Bretagne-Sud - France) Purple star - external presentation Forming of aluminium alloy sheets 

 Abstract

Aluminium-magnesium (Al-Mg) alloy sheets become widely used in the automotive industry, due to their excellent properties of high strength, corrosion resistance and weld ability. However, although these advantages, their formability at room temperature is lower than that of steel sheets and several material or structural effects are still difficult to predict. For example, Al-Mg sheets are known to experience dynamic ageing during plastic deformation called Portevin-Le Châtelier (PLC) effect, that is characterized by plastic instabilities leading to non-aesthetic stretcher lines on sheet surfaces. While this effect occurs typically during tensile tests, the jerky flow in an Al-Mg alloy during simple shear tests for various strain rates at room temperature is studied with a digital image correlation system. In parallel, an elastoviscoplastic model, proposed by McCormick et al., in which an additional internal variable called ageing time is introduced, is used to predict the propagation of PLC bands in shear tests specimens. The use of aluminium alloy is also slowed down by the springback magnitude which requires the evolution of sheet forming processes, mainly in two trends: the first one consists in the improvement of the numerical simulations at room temperature. The second aspect consists in increasing the formability by performing forming operations at warm temperature in order to modify the stress state in the formed parts thus leading to a decrease of springback. Some experimental and numerical results on springback in aluminium alloys for several forming temperatures will be presented.

Wed Aug 8 10 am Prof. Kefeng CAI Purple star - external presentation Research Progress in Thermoelectrics and Thermoelectric Materials 

 Abstract

In this presentation, the background related to thermoelectrics, including thermoelectric effects, thermoelectric conversion efficiency and applications of thermoelectric devices will be briefly introduced first. Some important research progress in thermoelectric field including new concepts and new material systems during the last decade will be followed secondly. Finally, the research in my group at Tongji University, including recently type-I Ge-based single crystals, single crystalline Zintl compounds, PbTe based materials, CoSb3 based skutterudites, chelcogenides, and polymer-inorganic nanocomposite thermoelectric materials will be introduced.

Friday August 3 10 am Mingwen Zhang Reducing Photoyellowing of Wool with Functional Nanoparticles 

 Abstract

This PhD project aims at investigating new ways to prevent wool against photoyellowing. Two main objectives will be achieved: (1) Fabrication of new inorganic UV absorbers with a novel structure, i.e. ZnO@void@SiO2, TiO2@void@SiO2 rattle-type nanoparticles. (2) Successful application of these inorganic UV absorbers on wool fabric to protect the fabric against photoyellowing, with a focus on the enhancement of rubbing fastness and washing resistance of the coated fabric. Wool fibre is well known as a superior natural textile material due to its resilience and softness. However the photodegradation of wool caused by exposure to sunlight, particularly from the UV light, makes the fibre weak and yellow, which is a significant problem for the wool industry. Although commercial bleaching and fluorescent whitening agent (FWA) finishing processes are widely employed to improve the whiteness of wool, the rate of photoyellowing of bleached and FWA-treated fabrics is much faster than the non-treated one, especially in the wet condition. In order to neutralize this destructive attack from ultraviolet light, the most widely used protective method is application of UV absorbers. The most successful UV absorber applied in wool is known as 'Cibafast W', which is an organic conjugated compound and has been commercialised by CSIRO in 1990. It is effective against phototendering rather than photoyellowing[1], and cannot be used on bleached and FWA-treated wool[2]. Compared with the organic UV absorbers, inorganic UV absorbers, such as ZnO and TiO2, are generally non-toxic, more stable and effective. But their strong photocatalysis effect could accelerate the photoyellowing process. The key research question is: is it possible to develop inorganic UV absorbers that have low photocatalytic activity?

Friday July 27 10am Professor Johnson Mak Purple star - external presentation The In's and Out's of HIV Biology 
3pm Special Seminar - WUST Purple star - external presentation Wuhan University of Science and Technology delegation led by its president Prof Jianyi Kong and Deakin University 
Friday May 25 10am Bernard Rolfe Stamping Tribology Group: Contact conditions and thermal effects on tooling wear when stamping AHSS 
Tuesday May 22 2pm Yandong Wang (Professor at Beijing Institute of Technology (BIT), China) Purple star - external presentation Evolution of Multi-Scale Stresses in Engineering Materials during Elastic/ Plastic Deformation 

 Abstract

well as processing parameters for advanced engineering components subjected to complex loading/temperature environments. Our recent experimental investigations of stress partitioning on different length scales ranging from submicrometer to millimeter during deformation by the neutron diffraction and synchrotron high-energy/micro-beam X-ray diffraction techniques in various engineering materials, such as the stainless steel and TRIP/TWIP steel, will be summarized. The detailed changes in crystallographic structures, multi-scale stress fields, and selections of martensitic variants during in-situ loading successfully revealed with a spatial resolution of sub-micrometer for elucidating the phase transformation and twinning mediated plasticity will be presented. The crystallographic theories established on the above experimental exploration can model well the micro-mechanical behaviors in anisotropic polycrystalline materials. Moreover, a transition in superelastic hysteresis loop from sharp with plateau to smooth without plateau will be reported in some new alloy systems and has been studied by in-situ X-ray diffraction methods. Some new progresses on the new understanding of superelastic behavior based on the above experimental findings will be also presented in this talk.

Monday May 7 12pm Edward Maginn Purple star - external presentation Water and Ionic Liquids: Solvation, Hydration and Other Curious Phenomena 

 Abstract

In almost every application of ionic liquids, water is present. In some cases, water is an undesired impurity. In others, it is an essential co-solvent, the main solvent, or a dominant phase present during a synthesis reaction or separation process. Because ionic liquids are salts, it has been assumed that they are very hydrophilic, but there is significant evidence that some ionic liquids are quite hydrophobic and that water interacts in various and unpredictable ways with ionic liquids. In this talk, we will describe a number of molecular-level simulation studies that have been directed at understanding the way in which water affects the thermodynamic and transport properties of ionic liquids. We will show how ionic liquids dissolved in a bulk water phase do not necessarily dissociate completely, but rather remain associated even under high dilution conditions. We will also use simulations to show how amino acid analogues partition between an aqueous phase, an octanol phase and an ionic liquid phase, and how the nature of the ionic liquid anions plays a major role in determining this partitioning tendency. Finally, we will show how simulations can enable the prediction of water solubility in an ionic liquid phase, and how these calculations are being used to optimize new ionic liquids being developed for CO2 capture.

Friday May 4 10am Michelle Marinovic (Business Relationship Manager ITSD Service) HDR Priviledges (What more do you want from your systems?) 
Monday April 23 3pm John J. Jonas (Birks Professor of Metallurgy Emeritus McGill University, Montreal, Canada) Purple star - external presentation The Eight Basic Laws for a Successful Scientific Career 

 Abstract

John Jonas was born in Montreal and educated at McGill and Cambridge Universities. He began teaching at McGill in 1960 and established a laboratory specializing in the high temperature deformation of metals. He was 35 years old before he published his first paper, now happily forgotten. No one had bothered to inform him of the Eight Basic Laws for success in research. Now he has painstakingly derived these himself and will share them with the audience and with those beginning their research careers. But first, everyone is invited to propose his or her own favorite rules. After suitable discussion, the two lists are compared and the best ones are proposed for adoption by researchers in training. He and his students have won numerous awards for their work and he has been named to the Order of Canada as well as to the Order of Quebec. His current h-index is 56 and he has more than 13,000 citations to his credit.

Monday April 16 11am Acad. Director Dr.-Ing. Dieter Veitm (Institut fuer Textiltechnik of RWTH Aachen University Germany) Purple star - external presentation Student exchange 
Wednesday April 11 10am KIRAN ANNASO PATIL (PhD student, IFM) Fabrication, Characterization and Applications of Cashmere Guard Hair Powder 

 Abstract

Cashmere guard hairs are stiff natural keratinous protein fibrous materials. They are segregated as a waste from cashmere fleece during collection of luxurious fine cashmere fibres by the dehairing process in the cashmere industry. Unlike the fine cashmere fibres, they are coarse; contain large medullation, and lack crimp or curvature. Consequently, cashmere guard hairs are not suitable for spinning and often fetch low value applications. As a protein fibre, cashmere guard hair contains different functional sites/groups such as -CO-NH-, -COOH, -SSR, -SH. These reactive groups can be utilized to bind organic and inorganic chemical species, similar to other protein fibres such as silk and wool, targeting specific applications. Recent studies on the powdered wool and silk have shown improved adsorption kinetics towards organic dyes and different transition metal ions, which demonstrated their potential in waste water treatment applications. Cashmere guard hair powder could also be used in similar ways to realise good value addition for the product that otherwise has little use. In the present study, cashmere guard hair has been pulverised into ultrafine powder and its potential in toxic heavy metal ion absorption has been investigated. To explore their application as a functional coating material, powders have been used to coat polyester fabric by electrostatic powder coating technique to impart the natural feel and antibacterial properties to the synthetic substrate.

Thursday April 5 10am Andreas Kupke Investigation of the effect of pre-strain in tension on the material behaviour of metal strips in bending and reverse bending  
Friday March 30 2pm MCN Nanofabrication in Victoria - a big network for small ideas 
Date 3pm Jascha Dominik Marnette Cate Ballard from AMSI AMSI Intern Program 
Tuesday February 28 10.30am Oana CAZACU Purple star - external presentation Deformation in low-symmetry metallic materials 

 Abstract

Low symmetry metallic materials (e.g. titanium, zirconium, etc.) display deformation and failure properties that are quite different from that of typical materials with cubic crystalline structure (aluminium, steels, etc). Rolled or extruded products exhibit a strong anisotropy and very pronounced difference in yielding and work-hardening evolution between tension and compression loadings. In this talk, new multi-scale models for description of the deformation of such materials are presented. These models are based on a detailed multi-scale characterization conducted in order to identify the physical mechanisms at the single crystal level and their effects on the macroscopic response. The effect of texture evolution is explicitly modeled using these experimental data and numerical tests results performed with a crystal plasticity model. Applications of these models to the simulation of the quasi-static and dynamic response of titanium and zirconium are presented. We conclude with the presentation of new analytic plastic potentials for isotropic and anisotropic porous materials containing spherical voids randomly distributed in a matrix displaying tension-compression asymmetry. These anisotropic plastic potential developed depend on all the invariants of stress and mixed stress-anisotropy invariants. It reduces to Benzerga and Besson (2001) criterion, if the matrix material is transversely isotropic and has no strength differential effects. If the matrix material is isotropic and has the same yield in tension and compression, Gurson (1977) criterion is recovered.

11am Sandrine THUILLIER Purple star - external presentation Material characterization - Application to sheet metal forming and assembly processes 

 Abstract

I will first introduce the research activities of the sheet metal forming group of the University of South Brittany. These activities deal with (i) the characterization of the mechanical behavior of metallic sheets at room (up to warm) temperatures and under quasi-static conditions and (ii) the design of laboratory devices of sheet forming and assembly processes, like deep drawing, flanging, hemming, twisting and indentation, to validate finite element simulations. I will then focus on the ductile damage characterization of a 6000 series aluminium alloy. Tensile tests on both straight and notched samples at different orientations to the rolling direction, and equibiaxial expansion tests were performed up to fracture. Gurson-Tvergaard-Needleman model, extended to the case of plastic anisotropy described by Hill's 1948 yield criterion, was used to represent the material behavior. The parameters were identified by inverse analysis and by using finite element simulations for inhomogeneous tests and a critical void volume fraction was then determined. This criterion based on a critical void volume fraction was then used to the case of both unconstrained bending of square samples and three-step hemming process of flat surface-straight edge sample. Ductile failure was evidenced with SEM observations and numerical predictions were compared with experiments. In a third step, ductile damage was also investigated at the microstructure scale (i.e. void distribution) by X-ray micro-tomography, for different triaxiality ratios.

Wednesday 22nd February 11.00am Jeff Wiggins Purple star - external presentation Research developments in Polymers and High Performance Materials at the University of Southern Mississippi 

 Abstract

His research areas include, sports and High Performance Materials, High-Performance Matrix Resins for Advanced Aerospace Composites, Environmentally Sustainable and Degradable Polymers, Reaction Extrusion, Restorable Polymers for Biomedical Devices. He currently holds 4 patents and has published a large number of scientific journal papers. Jeff had worked for a number of years for Bayer Corporation (as a Senior Polymer Chemist and Technical Director), Nike IHM Inc (as a Polymer Research Manager).

Friday 17th February 10.00am Professor J. Justin Gooding Purple star - external presentation Some Advantages of Nanomaterials in Biosensing 

 Abstract

Nanotechnology is having a profound effect on the development of new biosensors. Biosensors commonly comprise a biological recognition molecule immobilised onto the surface of a signal transducer to give a solid state analytical devices. The reaction between the biorecognition molecule and the analyte is a heterogeneous reaction and therefore the design of the biosensing interface is all important in determining the final performance of the biosensor. Advances in nanofabrication of biosensing interfaces is one of the two major areas where nanotechology has dramatically impacted on biosensor research in the last few years. With regards to fabricating biosensing interfaces the rise of self-assembled monolayers (SAMs) has been particularly important in giving molecular level control over the fabrication of the biosensing interface. Using SAMs has resulted in not only better performing biosensors but also new opportunities in developing new types of transduction mechanisms in biosensors which are more sensitive, selective or both. The application of new nanomaterials, be they nanoparticles, nanotubes or nanoporous materials, to biosensing is the other major area in which nanotechnology has influenced biosensing research. The use of high surface area nanomaterials has been important in producing biosensors with greater sensitivity and shorter responses times as well as being compatible with in vivo biosensing. This presentation will discuss the importance of nanotechnology on biosensing research drawing from examples from our laboratory. In the first half of the presentation we will concentrate on the advantages of fabricating biosensing interfaces using self-assembled monolayers. The latter half of the presentation will discuss some of the unique opportunities nanomaterials provide for biosensor development.

Friday 10th February 10.00am Prof. Bevis Hutchinson Purple star - external presentation Microstructures and Strengthening Mechanisms in Low-Carbon Martensites 

 Abstract

Martensitic steels have a long tradition of application in tools and machine steels but are finding increasing application as high strength sheet products in automobile structures. In these cases the high strength which allows weight savings must be combined with some ductility for forming and the steels need also to be weldable. The new steels have accordingly relatively low carbon contents and require rapid cooling to be fully hardened.Experiments have been carried out using four commercial steels with carbon levels in the range 0.1 to 0.5%C. Their microstructures have been examined using a variety of methods: SEM-EBSD, TEM, x-ray diffraction and atom probe tomography. These techniques were used to understand how the different microstructural features contribute to the strength of the steel. Some influence of grain size is predicted but it this relatively minor. XRD and APT confirm that very little of the carbon remains in solid solution in the as-quenched state. It is concluded that carbon atoms segregated at lath boundaries and dislocations contribute the major part of the strengthening.Very large internal strains are observed from x-ray line broadening. These type II internal stresses are similar in magnitude to the plastic flow stress of the martensite. Based on these observations, a model has been developed to describe the stress-strain behaviour during yielding of the steel in a tensile test. Results of the rather simple model are in reasonable agreement with experiments and can also explain some of the properties of the martensite after deformation and after low temperature tempering.

2.30pm Professor Josef Rychly Purple star - external presentation ASSESSMENT OF THE RESIDUAL SERVICE LIFE OF POLYMERS The Slovak Academy of Sciences in Bratislava - chemiluminescence 

 Abstract

The remaining service life of polymer materials is of interest for those who practically utilize materials. When a polymer is out of service one can immediately recognize it, but in the case of functioning polymer products which suddenly fail the explanation why it was so may be rather complicated. Practical knowledge of how certain properties of the material develop in time or with temperature on the trajectory of the service life (Scheme, points A, B, C and D) to the catastrophic failure scenario is of importance. The related properties which will be the subject of this presentation are: the intensity of the light emission (chemiluminescence) accompanying the degradation of the material, and thermoanalytical properties which follow from DSC and TG measurements.

Wednesday 8th February 2.00pm Luke A. O'Dell Purple star - external presentation Investigating Structure and Dynamics Using Solid-State NMR: New Opportunities for Difficult Quadrupolar Nuclei 

 Abstract

Solid-state nuclear magnetic resonance (NMR) spectroscopy is an extremely useful and versatile technique for the characterization of materials at the molecular level. It can provide unique, quantitative structural information such as atomic coordinations or bond lengths, and can also be used to probe dynamic processes over a wide range of timescales. I will provide a very brief, basic introduction to NMR spectroscopy and quadrupolar nuclei before outlining several recent methodological developments in this field. In particular, I will focus on techniques for "difficult" quadrupolar nuclei such as sulphur-33 and nitrogen-14, which are challenging to study using solid-state NMR, but, due to their ubiquity, have the potential to provide crucial information on a number of important systems.For sulphur-33, I show that a simple combination of computational methods can be used to generate signal enhancement schemes based on a crystal structure. This approach allows the a priori optimization of the experimental settings for this insensitive nucleus.For nitrogen-14, I show how frequency-swept RF pulses can be used to acquire extremely wide NMR spectra in relatively short timescales, and discuss the application of this approach to probe the proton conduction mechanism in crystalline imidazole. Finally, I describe the magic angle spinning (MAS) overtone experiment which allows the direct acquisition of high-resolution nitrogen-14 spectra from powder samples, something not previously thought possible.

Friday 3rd February 10.00am Mike Tan New Approaches to Tackling Key Issues in Corrosion Science and Engineering 

 Abstract

Although considerable knowledge has been acquired over the past several decades, localised corrosion remains a key unsolved issue that is the root cause of almost 70% corrosion failures in industry. Technological difficulties in measuring and preventing localised corrosion are responsible for insufficient progress in this important area of corrosion science and engineering research. During the past decade, with the advent of advanced physical and electrochemical techniques, there has been a marked increase in research aimed at understanding, monitoring and inhibiting localised corrosion. Major driving forces of such research include industry requirements of localised corrosion prediction and monitoring tools, industry interests in developing light-weighted alloys such as aluminium and magnesium based alloys, and the search for greener corrosion inhibitors. This talk will present some recent progresses in localised corrosion testing and monitoring, and also novel approaches of designing safer and environmentally friendly 'greener' inhibitors including rare earth metal - organic compounds and chelating agents that possess multiple reactive terminations. Particular focus will be on the application of new electrochemical techniques including the wire beam electrode for studying and monitoring localised corrosion in challenging and difficult to test corrosion media including multiphase oil & gas mixtures, soil and sand, atmospheric exposure, under thermal insulation and under-deposit.

Tuesday January 17 12pm Professor Elena Pereloma (University of Wollongong) Physical Metallurgy of Steels at the University of Wollongong 

 Abstract

Historically materials research at the University of Wollongong to a large extent focuses on steels as a priority area. This is due to the close links between the University and BlueScope Steel Ltd. (formerly BHP). In this talk a brief overview of the steel-related projects conducted by the BlueScope Steel Metallurgy Centre and Engineering Materials Institute will be presented. In particular, projects on pipeline steels, hydrogen embrittlement and transformation-induced twinning steels will be discussed.




For further information, please contact - Christine Rimmer ph: +61 3 5227 3241

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25th October 2012