1,721,036 research outputs found
Supplementary Movie 02 of the article Water-Stable Upconverting Coordination Polymer Nanoparticles for Transparent Films and Anticounterfeiting Patterns with Air-Stable Upconversion
No full text1 video. -- Video showing the scanning with the 532 nm CW laser over the VVUC1-CPNs-based spray-coated pattern deposited onto DPA-S-CPNs background. The UC emission only appears when the beam crosses the “UC” pattern.Photon upconversion (UC) based on triplet–triplet annihilation is a very promising phenomenon with potential application in several areas, though, due to the intrinsic mechanism, the achievement of diffusion-limited solid materials with air-stable UC is still a challenge. Herein, we report UC coordination polymer nanoparticles (CPNs) combining sensitizer and emitter molecules especially designed with alkyl spacers that promote the amorphous character. Beyond the characteristic constraints of crystalline MOFs, amorphous CPNs facilitate high dye density and flexible ratio tunability. To show the universality of the approach, two types of UC-CPNs are reported, exhibiting highly photostable UC in two different visible spectral regions. Given their nanoscale, narrow size distribution, and good chemical/colloidal stability in water, the CPNs were also successfully printed as anticounterfeiting patterns and used to make highly transparent and photostable films for luminescent solar concentrators, both showing air-stable UC.Peer reviewe
Supporting information of the article Water-Stable Upconverting Coordination Polymer Nanoparticles for Transparent Films and Anticounterfeiting Patterns with Air-Stable Upconversion
No full text63 pages. -- Section 1. Materials and methods. -- Section 2. Synthesis and characterization data of DPA-S-COOH and intermediates to
obtain it. -- Section 2. Synthesis and characterization data of Pd-S-COOH and intermediates to obtain
it. -- Section 3. Synthesis and characterization data of CAEBD-S-COOH and intermediates to
obtain it. -- Section 4. Synthesis and characterization data of Os-S-COOH and intermediates to
obtain it. -- Section 5: Preparation of nanoparticles and nanocomposite materials. -- Section 6: Supplementary Schemes, Tables, Figures and videosPhoton upconversion (UC) based on triplet–triplet annihilation is a very promising phenomenon with potential application in several areas, though, due to the intrinsic mechanism, the achievement of diffusion-limited solid materials with air-stable UC is still a challenge. Herein, we report UC coordination polymer nanoparticles (CPNs) combining sensitizer and emitter molecules especially designed with alkyl spacers that promote the amorphous character. Beyond the characteristic constraints of crystalline MOFs, amorphous CPNs facilitate high dye density and flexible ratio tunability. To show the universality of the approach, two types of UC-CPNs are reported, exhibiting highly photostable UC in two different visible spectral regions. Given their nanoscale, narrow size distribution, and good chemical/colloidal stability in water, the CPNs were also successfully printed as anticounterfeiting patterns and used to make highly transparent and photostable films for luminescent solar concentrators, both showing air-stable UC.Peer reviewe
Supplementary Movie 03 of the article Water-Stable Upconverting Coordination Polymer Nanoparticles for Transparent Films and Anticounterfeiting Patterns with Air-Stable Upconversion
No full text1 video. -- Video showing the scanning with the 650 nm CW laser over the VVUC2-CPNs-based spray-coated pattern deposited onto CAEBD-S-CPNs background. The UC emission only appears when the beam crosses the “UC” pattern.Photon upconversion (UC) based on triplet–triplet annihilation is a very promising phenomenon with potential application in several areas, though, due to the intrinsic mechanism, the achievement of diffusion-limited solid materials with air-stable UC is still a challenge. Herein, we report UC coordination polymer nanoparticles (CPNs) combining sensitizer and emitter molecules especially designed with alkyl spacers that promote the amorphous character. Beyond the characteristic constraints of crystalline MOFs, amorphous CPNs facilitate high dye density and flexible ratio tunability. To show the universality of the approach, two types of UC-CPNs are reported, exhibiting highly photostable UC in two different visible spectral regions. Given their nanoscale, narrow size distribution, and good chemical/colloidal stability in water, the CPNs were also successfully printed as anticounterfeiting patterns and used to make highly transparent and photostable films for luminescent solar concentrators, both showing air-stable UC.Peer reviewe
Water-Stable Upconverting Coordination Polymer Nanoparticles for Transparent Films and Anticounterfeiting Patterns with Air-Stable Upconversion
No full text1 video. -- Video showing the scanning with the 532 nm Nd:YAG nanoseconds pulsed laser over the VVUC1-CPNs-based spray-coated pattern deposited onto DPA-S-CPNs. The UC emission only appears from the “UC” pattern.Photon upconversion (UC) based on triplet–triplet annihilation is a very promising phenomenon with potential application in several areas, though, due to the intrinsic mechanism, the achievement of diffusion-limited solid materials with air-stable UC is still a challenge. Herein, we report UC coordination polymer nanoparticles (CPNs) combining sensitizer and emitter molecules especially designed with alkyl spacers that promote the amorphous character. Beyond the characteristic constraints of crystalline MOFs, amorphous CPNs facilitate high dye density and flexible ratio tunability. To show the universality of the approach, two types of UC-CPNs are reported, exhibiting highly photostable UC in two different visible spectral regions. Given their nanoscale, narrow size distribution, and good chemical/colloidal stability in water, the CPNs were also successfully printed as anticounterfeiting patterns and used to make highly transparent and photostable films for luminescent solar concentrators, both showing air-stable UC.Peer reviewe
Water-Stable Upconverting Coordination Polymer Nanoparticles for Transparent Films and Anticounterfeiting Patterns with Air-Stable Upconversion
Get PDFAltres ajuts: acords transformatius de la UABPhoton upconversion (UC) based on triplet-triplet annihilation is a very promising phenomenon with potential application in several areas, though, due to the intrinsic mechanism, the achievement of diffusion-limited solid materials with air-stable UC is still a challenge. Herein, we report UC coordination polymer nanoparticles (CPNs) combining sensitizer and emitter molecules especially designed with alkyl spacers that promote the amorphous character. Beyond the characteristic constraints of crystalline MOFs, amorphous CPNs facilitate high dye density and flexible ratio tunability. To show the universality of the approach, two types of UC-CPNs are reported, exhibiting highly photostable UC in two different visible spectral regions. Given their nanoscale, narrow size distribution, and good chemical/colloidal stability in water, the CPNs were also successfully printed as anticounterfeiting patterns and used to make highly transparent and photostable films for luminescent solar concentrators, both showing air-stable UC
Supporting Information for: Enhanced Electrochromic Smart Windows Based on Supramolecular Viologen Tweezers
No full textAdditional data on the preparation and characterization of electrochromic materials and devicesExtending the spectral response of viologen-based electrochromic devices to the near-infrared region is essential to enhance their performance for smart window applications. Although synthetic and formulation modifications have been proposed to achieve this goal, these strategies always come at the expense of deteriorating the electrochromic behavior of the system. To overcome this limitation, herein we exploited the supramolecular chemistry of viologen molecular tweezers, which undergo an intramolecular dimerization process upon reduction that leads to broad light absorption through the visible and near-infrared spectra. We observed this behavior to take place at low concentrations in a variety of electrolytic media, including solid-state ionogels that could be applied to the fabrication of electrochromic devices. Better spectral response, lower operation voltage, and higher stability were measured for these devices relative to analogous systems based on viologen monomers. As a result, when used as electrochromic smart windows, the viologen tweezer-based devices exhibited enhanced modulation of solar heat gain with reduced energy consumption, thereby demonstrating the potential of viologen supramolecular chemistry to rationally improve the performance of electrochromic devices.Peer reviewe
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Multistimuli-responsive smart windows based on paraffin-polymer composites
Get PDFAltres ajuts: acords transformatius de la UABAltres ajuts: CERCA Programme/Generalitat de CatalunyaDespite their potential to reduce energy consumption in buildings and increase user's comfort, the general application of smart windows is currently hampered by economic and technological factors. To overcome these limitations, herein we report a new strategy for the fabrication of thermoresponsive smart windows based on polymer films loaded with paraffin nanoparticles. Proper selection of these components allows refractive index matching when the paraffin nanoparticles are in their solid state - i.e., high visible and near-infrared light transparency -, which is lost after melting, thereby resulting in pronounced light scattering - i.e., opacity. As a result, these films show ample modulation of sunlight transmittance upon heating, while additionally exhibiting other advantageous features: facile preparation from low-cost materials; high photostability, flexibility and scalability; and fine tunability of their thermal response. Moreover, by deposition onto transparent electrodes or incorporation of nanostructured photothermal agents, the solar transmittance modulation of our paraffin-polymer composites can also be triggered with low voltages - i.e., to warrant user's control - or sunlight absorption - i.e., to improve self-adaptation to ambient conditions. Actually, films with combined thermal and photothermal activity allow high sunlight transmission in cold weather while efficiently reducing solar heat gain indoors in sunny hot days
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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