1,721,089 research outputs found
Water Droplets to Nanotechnology. A journey through self-assembly
No full textThe ability of nanostructures to organize into complex arrangements leads to unique materials with valuable applications. Self-assembly is therefore a key concept for
nanotechnology, but it can be quite a complex and difficult
subject to approach. Water Droplets to Nanotechnology gives a simple and general overview of the different self-assembly processes which are at the basis of recent developments in nanotechnology.
The book shows how simple phenomenon from everyday
examples can become sophisticated tools for self-assembly and the fabrication of nanomaterials. By exploring the coffee stain and tears of wine phenomena, the first part looks at how
the evaporation of a droplet of colloidal solution can be used in designing organized structures. This leads onto more complex systems such as templated porous materials, photonic crystals, colloidal nanocrystals and quasi-crystals through to bottom-up
systems for designing hierarchal materials.
By taking the reader on a journey from everyday life to the secrets of nanotechnology, the book is suitable for a nonspecialist
audience interested in self-assembly as well as the wider perspectives and latest developments of nanoscience
Hard X-rays meet soft matter: when bottom-up and top-down get along well
No full text"The combined approach of bottom-up and top-down routes allows direct soft matter patterning and fabrication of devices using faster and more versatile protocols. In this research news, we briefly describe some of the fundamentals, development, recent progress and perspectives in the fabrication and patterning of functional nanostructured materials by interaction with high energy X-rays.
Hybrid materials with an increased resistance to hard X-rays using fullerenes as radical sponges
No full text"The protection of organic and hybrid organic–inorganic materials from X-ray. damage is a fundamental technological issue for broadening the range of. applications of these materials. In the present article it is shown that doping. hybrid films with fullerenes C60 gives a significant reduction of damage upon. exposure to hard X-rays generated by a synchrotron source. At low X-ray dose. the fullerene molecules act as ‘radical scavengers’, considerably reducing the. degradation of organic species triggered by radical formation. At higher doses. the gradual hydroxylation of the fullerenes converts C60 into fullerol and a. bleaching of the radical sinking properties is observed
Hard X-rays and soft-matter: processing of sol-gel films from a top down route
No full textA current trend of applied research in the field
of nanomaterials is the integration of bottom up and top
down fabrication methods. Sol–gel chemistry is widely
applied to obtain different functional materials from a
bottom up route, especially in the case of thin films. To
fabricate devices based on sol–gel films, which include
nanocomposites and mesoporous ordered materials, application
of lithography technologies is mandatory. Among
the different lithographic approaches, photolithography is
widely used by companies using micro-fabrication processes.
In this context, photolithography is a typical top
down method that requires to be integrated as much as
possible with deposition of thin films from a liquid phase.
Recently we have developed a new integrated fabrication
method which uses high energy photons, such as hard
X-rays, which typically have energies between 2.5 and
12 keV, for the manipulation and production of a large
variety of functional materials and devices. In the present
review a short overview of such achievements is presented
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Highly ordered self-assembled mesostructured hafnia thin films: an example of rewritable mesostructure
No full text- …
