Fullerene Desymmetrization as a Means to Achieve Single‐Enantiomer Electron Acceptors with Maximized Chiroptical Responsiveness

Solubilized fullerene derivatives have revolutionized the development of organic photovoltaic devices, acting as excellent electron acceptors. The addition of solubilizing addends to the fullerene cage results in a large number of isomers, which are generally employed as isomeric mixtures. Moreover, a significant number of these isomers are chiral, which further adds to the isomeric complexity. The opportunities presented by single‐isomer, and particularly single‐enantiomer, fullerenes in organic electronic materials and devices are poorly understood however. Here, ten pairs of enantiomers are separated from the 19 structural isomers of bis[60]phenyl‐C61‐butyric acid methyl ester, using them to elucidate important chiroptical relationships and demonstrating their application to a circularly polarized light (CPL)‐detecting device. Larger chiroptical responses are found, occurring through the inherent chirality of the fullerene. When used in a single‐enantiomer organic field‐effect transistor, the potential to discriminate CPL with a fast light response time and with a very high photocurrent dissymmetry factor (g_ph = 1.27 ± 0.06) is demonstrated. This study thus provides key strategies to design fullerenes with large chiroptical responses for use as chiral components of organic electronic devices. It is anticipated that this data will position chiral fullerenes as an exciting material class for the growing field of chiral electronic technologies.     

Unveiling the modernity bias: a critical examination of the politics of ICT4D

The issue of politics in information and communication technology for development (ICT4D) research is rarely debated, yet one of the key instrumental freedoms proposed by Sen [(1999). Development as freedom. New York: First Anchor Books] in his seminal book on development is political liberty for individuals. We argue that ICT4D initiatives are predominantly informed by a modernist philosophy, which in their effort to bring some material progress risk granting technological tools a major role. This view assumes that ICT4D users are merely passive recipients of the benefits of technology. Moreover, it implies that development can only be brought by those in a more developed, powerful position. This in itself is a political viewpoint, and thus politics is embedded in the design of ICT4D projects. Building on Sen's (1999) capability framework, we discuss how far ICT4D projects are able to assist political liberty of the alleged beneficiaries, given that political liberties are constrained by wider institutional factors. We conclude by making a call for researchers to more critically examine the structure and intention of ICT4D projects.     

Housing rites: young people’s experience of conditional pathways out of homelessness

Abstract

Since devolution, Scotland has been perceived as an international trailblazer in homelessness policy. This is principally due to The Homelessness Etc. (Scotland) Act 2003 which led to the ‘priority need’ category being abolished in 2012, thus placing a statutory duty upon local authorities to provide settled accommodation to nearly all homeless households. This has been widely praised for extending citizenship rights to those experiencing homelessness. In contrast to this, this paper examines the experiences of young people (aged 16–24) where judgements on whether they were ‘housing ready’ delayed them being provided settled accommodation. Drawing on Bourdieu's writing on rites of institution, it is shown how the symbolic categories deployed by support services and landlords operated as a means of ‘vision and division’, creating new social positions that lengthened the pathway out of homelessness. In a complimentary move, there was a fusion of support with control mechanisms to determine a person's readiness for settled accommodation.     

Evolution of Tungsten Fiber-Reinforced Tungsten-Remarks on Production and Joining

Material issues pose a significant challenge for the design of future fusion reactors. These issues require new advanced materials to be developed. W-fiber-reinforced W-composite material (W _f/W) incorporates extrinsic toughening mechanisms increasing the resistance against failure and thus granting steps toward application in a future fusion reactor. W _f/W can be produced based on chemical vapor deposition or powder metallurgical routes. In this contribution, the efforts of upscaling the production of W _f/W will be reviewed based on recent results. In addition, the activities related to enabling large-scale production for new fusion applications are being studied. Herein, two main achievements are to be highlighted. First, an upscaled production is established to produce flat tile samples for joining tests on copper and steel, and second, a new method of joining W _f/W on copper is established and tested under high heat-flux conditions.