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Supporting Virtual Communities through Disciplinary Repository Development
No full textPurpose - This article aims to discuss the implementation of social networking tools onto existing disciplinary repository platforms - both commercial and open source - with the purpose of building enhanced disciplinary repository-based virtual communities. Design/methodology/approach - This article is a case study. The University of Massachusetts Amherst has served as a test-bed for two disciplinary repository-based virtual communities, InterNano and ESENCe, both of which serve as examples for the development of features that facilitate social connections in emerging multi-disciplinary fields. Two different approaches to the technical implementation of social networking tools onto standard disciplinary repository software platforms are described, as well as the challenges faced by each project. Findings - Although disciplinary repositories are not typically conceived as social spaces, disciplinary repositories can integrate social networking components to act as ``knowledge brokers'' for emerging disciplines of practice. The challenges of developing disciplinary repositories as virtual communities include software limitations, community integration and trust building, and identification and acquisition of relevant content in emerging and dynamic fields. Originality/value - InterNano and ESENCe represent the growing long-tail of disciplinary repositories, about which little literature exists. This case study demonstrates the activities and challenges of developing small-scale multi-disciplinary disciplinary repositories into active virtual communities
Development and Characterization of a Capillary-flow Microfluidic Device for Nucleic Acid Detection
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Hierarchically Structured Porous Cadmium Selenide Polycrystals Using Polystyrene Bilayer Templates
No full textIn this study, a novel approach is demonstrated to fabricate hierarchically structured cadmium selenide (CdSe) layers with size-tunable nano/microporous morphologies achieved using polystyrene (PS) bilayered templates (top layer: colloidal template) via potentiostatic electrochemical deposition. The PS bilayer template is made in two steps. First, various PS patterns (stripes, ellipsoids, and circles) are prepared as the bottom layers through imprint lithography. In a second step, a top template is deposited that consists of a self-assembled layer of colloidal 2D packed PS particles. Electrochemical growth of CdSe crystals in the voids and selective removal of the PS bilayered templates give rise to hierarchically patterned 2D hexagonal porous CdSe structures. This simple and facile technique provides various unconventional porous CdSe films, arising from the effect of the PS bottom templates
Chemoselective Nanoporous Membranes via Chemically Directed Assembly of Nanoparticles and Dendrimers
No full textChemoselective nanoporous membranes: tunably porous membranes with embedded functionalities are generated using a template-free, chemically directed nanoparticle-dendrimer (NP-Den) network assembly. This approach provides a direction in the design of post-functionalizable nanoporous membranes for distinguishing both organic molecules and proteins with excellent chemo-and bioselectivity
Selective Enrichment and Sensitive Detection of Peptide and Protein Biomarkers in Human Serum using Polymeric Reverse Micelles and MALDI-MS
No full textFirst-principles Theoretical Analysis of Transition-metal Doping of ZnSe Quantum Dots
No full textWe present a systematic analysis of the underlying mechanism of transition-metal doping in ZnSe nanocrystals, using first-principles density functional theory calculations. Our analysis focuses on the adsorption and surface segregation of Mn dopants on ZnSe nanocrystal surface facets. We find that the chemical potentials of the growth precursor species determine the surface structure and morphology of the nanocrystals. We report binding energies for Mn adsorption onto ZnSe surfaces and find that all the anion-rich surfaces contribute toward dopant adsorption onto ZnSe nanocrystal surface facets. Beyond a critical value of dopant surface coverage, these adsorbed dopants may induce structural transitions in low-Miller-index surface facets, resulting in morphological transitions of the ZnSe nanocrystals. In addition, the dopant binding-energy dependence on the dopant surface concentration explains the doping difficulties during nanocrystal growth. Finally, we report surface segregation energy profiles for Mn dopant segregation on low-Miller-index ZnSe nanocrystal surface facets. We find that, under conditions that render ZnSe(001)-(2 x 1) as the dominant dopable surface of ZnSe nanocrystals, Mn dopants do not have a tendency to segregate on this surface; this guarantees that the dopants remain incorporated into the core regions of the nanocrystal instead of escaping to the surface. (C) 2012 American Institute of Physics. http://dx.doi.org/10.1063/1.473484