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DST Seminar: A Journey Across the Sciences: Applications of X-ray Photoelectron Spectroscopy

Dr Marc Walker
Department of Physics, University of Warwick

2-3pm Wednesday 27th February
Materials & Analytical Sciences 2.06

X-ray photoelectron spectroscopy (XPS) is a powerful surface analysis technique capable of probing the elemental composition and chemistry of the surface of materials. XPS utilises the photoelectric effect and has led to two Nobel Prizes in Physics, Albert Einstein (1921) and Kai Siegbahn (1981). Originally largely rooted in fundamental surface science, the technique has gained popularity as a powerful surface analytical tool in a variety of different fields, leading to over 10000 publications per year in recent years. Here we highlight just a few of the branches of modern science to which XPS has been applied at the Warwick Photoemission Facility, going on a journey across the sciences from biology to space science via a series of interesting multi-technique case studies, including a particular focus on carbon-based materials such as graphene and diamond. The presentation will also highlight the equipment portfolio of the XPS Facility and outline how to access the instruments.

Mon 18 February 2019, 11:00 | Tags: Seminar

DST Seminar: Opportunities for additive manufacturing in device fabrication

Dmitry Isakov
2pm - 3pm, Thursday 14th February
Materials & Analytical Sciences (MAS 2.06)
Additive manufacturing (aka 3D printing) is invading more and more space in our everyday life. And now, a decade after the first desktop 3D printer appeared to be available for enthusiasts, we can hear about the first models of desktop 3D printers that print metals. And this is just the beginning.
In today's talk, I will make an overview of the current state of additive printing methods in light of the use of this technology for the rapid prototyping of functional devices. In particular, I will discuss the use of 3D printing for devices with a gradient index of refraction used to control the direction of an electromagnetic wave in a microwave region.
Mon 11 February 2019, 09:26 | Tags: Seminar

DST Seminar: Engineering at the Nanoscale – gaining insight through advanced characterisation

Prof Barbara Shollock
WMG, University of Warwick
Wednesday 5th December
Materials & Analytical Sciences 2.06

From the gas turbines that power the Airbus to the steels used for cars and food cans, engineering alloys form an important class of materials, but can appear less exciting than headline-grabbing nanomaterials and biomaterials.

Despite their unglamorous press, these alloys require understanding at the nanoscale to develop new alloys and to mitigate failure in service. This talk will review a range of alloys, the challenges they face in service and characterisation approaches to determine their nanoscale chemical, structural and physical behaviour.

Tue 04 December 2018, 11:11 | Tags: Seminar

DST Seminar: Fancy Colored Diamonds: Towards an Understanding of their Color Origin

Ulrika D'Haenens-Johansson
Gemological Institute of America (GIA), New York, USA
1pm - 2pm, Monday 3rd December
Materials & Analytical Sciences (MAS 2.06)

Traditionally, when people think of diamonds as a gemstone they visualize the classic colorless round brilliant. However, through the incorporation of point or extended defects in the crystal lattice, the full rainbow of colors can be found in natural diamonds. These rare diamonds, termed “Fancy Colored” in the gem trade, often command higher per carat* prices (up to $3.3 million per carat) compared to their colorless counterparts, generating great excitement at auctions and in the news. These colors can also be produced artificially through treatment of selected natural or laboratory-grown diamonds. By studying the structure, formation and destruction of color producing defects in diamond through a range of spectroscopic techniques it is possible to separate natural, treated and synthetic diamonds, maintaining transparency in the trade. In this seminar we will review some of the key color-producing defects in both natural and synthetic diamonds and see examples of how careful defect engineering can be used to produce attractive fancy colored materials.
*1 carat = 200 mg

Mon 26 November 2018, 15:15 | Tags: Seminar

DST Seminar: Nitrogen aggregation in diamond - Matthew Dale, De Beers Technologies

1-2pm Monday 26th November
Materials & Analytical Sciences 2.06

Nitrogen is the most commonly identified impurity in diamond. When diamond is annealed with sufficient temperature, various species become mobile and single nitrogen substitutional atoms aggregate into larger complexes. Understanding and controlling this process is significant to engineering defects into diamond, such as the nitrogen-vacancy centre, as well as understanding the differences between natural and synthetic diamond. Irradiation prior to annealing increases the aggregation rate; this is caused by both vacancies and interstitials mediating the mobility of nitrogen. In this presentation I will talk about the migration of vacancies and interstitials and their role in enhancing the aggregation process. I will highlight differences between aggregation in natural, HPHT and CVD grown diamond. Finally, I will explain how these differences can be used to effectively distinguish natural from synthetic diamond and their use in De Beers’ screening instruments.

Tue 20 November 2018, 12:35 | Tags: Seminar

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