748 research outputs found
Hierarchical DSSC structures based on single walled TiO2 nanotube arrays reach back-side illumination solar light conversion efficiency of 8%
In the present work we introduce a path to the controlled construction of
DSSCs based on hierarchically structured single walled, self-organized TiO2
layers. In a first step we describe a simple approach to selectively remove the
inner detrimental shell of anodic TiO2 nanotubes (NTs). This then allows
controlled well-defined layer-by-layer decoration of these TiO2-NT walls with
TiO2 nanoparticles (this in contrast to conventional TiO2 nanotubes). We show
that such defined multiple layered decoration can be optimized to build dye
sensitized solar cells that (under back-side illumination conditions) can yield
solar light conversion efficiencies in the range of 8 %. The beneficial effects
observed can be ascribed to a combination of three factors : 1) improved
electronic properties of the single walled tubes themselves, 2) a further
improvement of the electronic properties by the defined TiCl4 treatment, and 3)
a higher specific dye loading that becomes possible for the layer-by-layer
decorated single walled tubes.Comment: arXiv admin note: text overlap with arXiv:1610.0643
Shedding Their Refugee Skin: Construqtions ofWomen Refugees and International Aid Regimes
This paper explores the development establishment as
an instutional network,
a main actor in producing social constructions
of women refugees. These
knowledge products are particularly
rooted in Western culture. The central
questions asked here first, how does
knowledge produced within the development
establishment affect women refugees
and second, are the voices of women
refugees incorporated into the knowledge
production process?Cet article examine l'élite du développement en
tant que réseau institutionnel, et en tant qu'acteur majeur dans la production
de la construction sociale des femmes
réfugiées. Les questions centrales posées
ici sont: d'abord, comment la connaissance
produite au sein de l'élite du développement
affecte-t-elle les femmes
réfugiées, et ensuite, la voix des femmes
réfugiées est elle entendue et intégrée
dans ce processus de production de la
connaissance
Aligned metal oxide nanotube arrays: key-aspects of anodic TiO2 nanotube formation and properties
Over the past ten years, self-aligned TiO2 nanotubes have attracted
tremendous scientific and technological interest due to their anticipated
impact on energy conversion, environment remediation and biocompatibility. In
the present manuscript, we review fundamental principles that govern the
self-organized initiation of anodic TiO2 nanotubes. We start with the
fundamental question: Why is self-organization taking place? We illustrate the
inherent key mechanistic aspects that lead to tube growth in various different
morphologies, such as rippled-walled tubes, smooth tubes, stacks and
bamboo-type tubes, and importantly the formation of double-walled TiO2
nanotubes versus single-walled tubes, and the drastic difference in their
physical and chemical properties. We show how both double- and single-walled
tube layers can be detached from the metallic substrate and exploited for the
preparation of robust self-standing membranes. Finally, we show how by
selecting the right growth approach to TiO2 nanotubes specific functional
features can be significantly improved, e.g., an enhanced electron mobility,
intrinsic doping, or crystallization into pure anatase at extremely high
temperatures can be achieved. This in turn can be exploited in constructing
high performance devices based on anodic TiO2 in a wide range of applications.Comment: from Nanoscale Horiz., 2016, Advance Articl
Aminated TiO2 nanotube as a Photoelectrochemical Water Splitting photoanode
The present work reports on the enhancement of TiO2 nanotubes
photoelectrochemical water splitting rate by decorating the nanostructure with
an amine layer in a hydrothermal process using diethylenetriamine (DETA). The
aminate coated TiO2 tubes show a stable improvement of the photoresponse in
both UV and visible light spectrum and under hydrothermal conditions, 4-fold
increase of the photoelectrochemical water splitting rate is observed. From
intensity modulated photocurrent spectroscopy (IMPS) measurements significantly
faster electron transport times are observed indicating a surface passivating
effect of the N-decoration.Comment: In Catalysis Today, Available online 21 July 201
Human Rights: Setting the Stage for Protecting Refugee Women
This paper explores the social construction
of women refugees from the perspective of
the human rights regime with an
eye to revealing whether the voices of
refugee women are reflected. To this end
the paper examines the development of
women refugees as a category within
human rights discourse and how this
category has been bolstered by the concept
of women's human rights within the last
decade.Cet article explore la construction sociale
des femmes réfugiées dans la perspective du
régime des droits humains avec une
attention particulière portée sur la question
de savoir si la voix des femmes réfugiées y
est entendue. A cette fin l'article examine l'évolution de la notion de femme réfugiée
comme catégorie au sein du discours sur les
droits humains, et comment cette catégorie
a été supportée par Ie concept de droits
humains féminins dans la dernière
décennie
The Moth Project
The Moth Project
Assistant Prof. Jeff Schmuki (Georgia Southern) and Associate Professor Wendy DesChene (Auburn University)
The ArtLab is an off-grid, solar powered 10-foot trailer that houses a mobile art space/laboratory or ArtLab. The ArtLab provides the stage for native plant gardens and solar powered light tents that attract moths and other insects for a non-destructive survey. The Moth Project shares the importance of pollinators in the environment through a hands-on community/citizen science and art experience. Research was compiled into a free downloadable field guide of the local moths found on the Georgia Southern campus that will interest in sustainability while promote simple actions that assist our declining pollinators and encourage backyard naturalism
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