Local structure and photocatalytic property of mechanochemical synthesized ZnO doped with transition metal oxides

Co and Mn doped ZnO nanoparticles with up to 5 at% doping level were prepared using a mechanochemical method. The location of dopant ions and the effect of doping on the photocatalytic activity were investigated by Synchrotron X-ray Absorption (XAS) Spectroscopy and photo-degradation of Rhodamine B solution. The XAS results showed that the Co ions substituted the Zn ions in the ZnO wurtzite phase structure. It was revealed that Co-doping strongly reduced the photocatalytic activity, while Mn-doping increased the photocatalytic activity at low doping levels but reduced the activity at high doping levels.

The effect of a rapid heating rate, mechanical vibration and surfactant chemistry on the structure-property relationships of epoxy/clay nanocomposites

The role of processing conditions and intercalant chemistry in montmorillonite clays on the dispersion, morphology and mechanical properties of two epoxy/clay nanocomposite systems was investigated in this paper. This work highlights the importance of employing complementary techniques (X-ray diffraction, small angle X-ray scattering, optical microscopy and transmission electron microscopy) to correlate nanomorphology to macroscale properties. Materials were prepared using an out of autoclave manufacturing process equipped to generate rapid heating rates and mechanical vibration. The results suggested that the quaternary ammonium surfactant on C30B clay reacted with the epoxy during cure, while the primary ammonium surfactant (I.30E) catalysed the polymerisation reaction. These effects led to important differences in nanocomposite clay morphologies. The use of mechanical vibration at 4 Hz prior to matrix gelation was found to facilitate clay dispersion and to reduce the area fraction of I.30E clay agglomerates in addition to increasing flexural strength by over 40%.

At the crossroads : the relationship between heritage and intellectual property in traditional knowledge protection in Southeast Asia

Matters related to traditional knowledge (TK) and traditional cultural expressions (TCEs) are 'at the crossroads' in various respects. From a legal perspective, TK is discussed in several international forums and is at the intersection of several already established or still emerging fields of law. Of particular interest here is the relationship between heritage and intellectual property. It is discussed in international diplomatic negotiations on intellectual property (IP) protection for TK/TCEs in the context of the Intergovernmental Committee on Intellectual Property and Genetic Resources, Traditional Knowledge and Folklore of the World Intellectual Property Organization (WIPO) and in the context of the UNESCO Convention for the Safeguarding of Intangible Cultural Heritage. Geographically, TK is also located 'at the crossroads'. It is linked to cultural spaces associated with certain peoples and certain territories and these are often not identical with the borders of nation states. Such borders are a colonial artefact that often fails to reflect the ethno-geographical reality of a region. The divergent national and ethnic boundaries create overlapping claims in situations that may be further complicated by both ancient and modern transmigrations and/or shared heritage. The Southeast Asian region, which is the geographical focus of this article, has been at the crossroads of trade and religious and cultural influences for centuries and it provides, therefore, excellent examples for such overlapping cultural spaces and resulting conflicting or competing claims. The article examines the legal and geographical intersections that have contributed to the current situation and the relationship between cultural and intellectual property in regional claims as well as examples of disputes that have arisen and the reasons for them.

Creating the Iraq cultural property destruction database: calculating a heritage destruction index

Over the past decade there have been constant reports of damage to significant cultural property in several complex (post-)conflict and (post-)revolutionary states. Recent events in Syria, Mali, Libya, Egypt, Tunisia, Afghanistan and Iraq – as devastating as they have been for people – have also had dramatic consequences for a number of important cultural heritage sites. Despite the severity of these events and global concern, the field of heritage studies has not developed a methodology for cataloguing such heritage destruction in a database. Addressing this paucity in the literature, this article details the methodology developed to produce the Iraq Cultural Property Destruction database, the world’s first database to document the destruction of cultural property in Iraq. This article also documents the calculation of the Heritage Destruction Index – a scale for measuring both the heritage ‘significance’ of a site and the overall level of destruction. Finally, this article also demonstrates the manifold uses of such a database in measuring and monitoring heritage destruction in Iraq. This study therefore sets a significant precedent in heritage studies by providing methods that can be applied to other contexts (past, present and future) to document the destruction of cultural property in complex contexts.