A rewritable photonic crystal (PC)
paper as an environmentally
friendly and low-resource-consuming material for information storage
and spreading has gradually become a research hotspot. In this work,
a novel rewritable PC paper with inkless writing and double-sided
rewritability properties was developed. A double-sided epoxy resin
PC paper exhibiting an inverse opal structure and a bright structural
color was fabricated using the sacrificial template method. Carbon
black was doped into the material to increase color saturation and
purity while preventing light transmission and protecting the double-sided
structural color from interference. The force of sliding friction
and deformation triggered by capillary pressure as well as swelling-triggered
recovery of the inverse opal structure led to an easy rewriting of
the PC paper. The PC paper exhibited excellent rewritability even
after 50 runs of the rewriting process. Given the inkless and double-sided
rewriting, this study provides a new method for the preparation of
rewritable PC papers.
In the past decade, resilient cities (RCs) have gained extensive attention in academic and political debates as a vision of urban futures. In particular, with the support of the Rockefeller Foundation’s Resilient City 100 Program (RC100), a number of cities worldwide have pushed this concept forward from theory to practice through their RC plans/strategies. However, there is widespread doubt regarding how much this holistic idea of the future built environment contributes to urban practice. After developing a scoring evaluation matrix based on the synthesis of existing RC assessment frameworks, this review scrutinizes the plans, reports, city leaders’ speeches, official websites and academic reviews of five representative resilient cities and investigates their motivations, planning and achievements. The results demonstrate a huge theoretical and practical gap in RC: while RC plans attempt to expand as comprehensively as possible from cities’ initially narrow motivations, their achievements in implementation are limited. Although RC provides more holistic solutions to the cities, the limited resources mean that cities have to prioritize their urgent issues in their everyday practice. This paper calls for designating more feasible and specific features in RC visions and maintaining regular alignments from planning to actions in future RC practice.
Photonic crystal (PC) films have been widely applied
in color displays
and the anticounterfeiting field due to their facile fabrication process
and easily tunable properties. However, the method for improving the
reusability of the color-changed swollen PC films is still a challenge.
In this paper, we report the color recovery behavior of epoxy resin
inverse opal photonic crystal (EP-IOPC) films, which show different
responses after being infiltrated with ethanol, acetone, and dimethyl
sulfoxide (DMSO) based on the swelling and deswelling process. DMSO
achieved the best effect on the color recovery of the swollen EP-IOPC
films compared to ethanol and acetone, and the reflection spectrum
blue-shifted in a small range and finally stabilized at a 60 nm deviation
from the original spectrum after 10 times recovery. This strategy
of color recovery not only solved the problem that the swollen EP-IOPC
film’s color changes to a certain extent but also showed promising
potential in the color display and anticounterfeiting field.
Internet public opinion is an influential and tendentious opinion or speech expressed by the public on the Internet to a certain focus, which has formed a powerful force of public opinion. Internet public opinion has become a concentrated reflection of public opinion, opening up another channel to truly reflect public opinion, and effectively promoting the supervision of government officials and their decisions. In view of the strong emotional weakness of the current network public opinion, we can train forum opinion leaders to guide the public opinion with affinity and consideration, and select and enlarge the network public opinion by connecting the traditional media.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.