In this article, Mark R. Warren argues that if urban school reform in the United States is to be successful, it must be linked to the revitalization of the communities around our schools. Warren identifies a growing field of collaboration between public schools and community-based organizations, developing a typology that identifies three different approaches: the service approach (community schools); the development approach (community sponsorship of new charter schools); and the organizing approach (school-community organizing). The author elaborates a conceptual framework using theories of social capital and relational power, presenting case studies to illustrate each type. He also discusses a fourth case to demonstrate the possibilities for linking individual school change to political strategies that address structures of poverty. Warren identifies shared lessons across these approaches, and compares and contrasts the particular strengths and weaknesses of each. Warren concludes with a call for a new approach to urban education reform that links it theoretically and practically to social change in America's cities.
. orcid.org/0000-0003-3915-8887 et al. (3 more authors) (2017) Solvent-switchable continuous-breathing behaviour in a diamondoid metal-organic framework and its influence on CO2 versus CH4 selectivity. Nature Chemistry.
Selective adsorption of SO2 is realized in a porous metal–organic framework material, and in‐depth structural and spectroscopic investigations using X‐rays, infrared, and neutrons define the underlying interactions that cause SO2 to bind more strongly than CO2 and N2.
Understanding the molecular mechanism
of proton conduction is crucial
for the design of new materials with improved conductivity. Quasi-elastic
neutron scattering (QENS) has been used to probe the mechanism of
proton diffusion within a new phosphonate-based metal–organic
framework (MOF) material, MFM-500(Ni). QENS suggests that the proton
conductivity (4.5 × 10–4 S/cm at 98% relative
humidity and 25 °C) of MFM-500(Ni) is mediated by intrinsic “free
diffusion inside a sphere”, representing the first example
of such a mechanism observed in MOFs.
Molecular crystals can be bent elastically by expansion or plastically by delamination into slabs that glide along slip planes. Here we report that upon bending, terephthalic acid crystals can undergo a mechanically induced phase transition without delamination and their overall crystal integrity is retained. Such plastically bent crystals act as bimorphs and their phase uniformity can be recovered thermally by taking the crystal over the phase transition temperature. This recovers the original straight shape and the crystal can be bent by a reverse thermal treatment, resulting in shape memory effects akin of those observed with some metal alloys and polymers. We anticipate that similar memory and restorative effects are common for other molecular crystals having metastable polymorphs. The results demonstrate the advantage of using intermolecular interactions to accomplish mechanically adaptive properties with organic solids that bridge the gap between mesophasic and inorganic materials in the materials property space.
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