A5012718613- Superconducting and THz Device Technology
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Physics of Superconductivity and Magnetism
- Advanced Semiconductor Detectors and Materials
- Particle Detector Development and Performance
- Synthesis and properties of polymers
- Photochromic and Fluorescence Chemistry
- Luminescence and Fluorescent Materials
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Biopolymer Synthesis and Applications
- Epoxy Resin Curing Processes
- Molecular Junctions and Nanostructures
- Supramolecular Chemistry and Complexes
- Medical Imaging Techniques and Applications
- Liquid Crystal Research Advancements
- Superconducting Materials and Applications
- Advanced X-ray and CT Imaging
- Synthetic Organic Chemistry Methods
- Advanced Polymer Synthesis and Characterization
- Material Properties and Applications
- Atomic and Subatomic Physics Research
- Photoreceptor and optogenetics research
- Organic Light-Emitting Diodes Research
X-ray Instrumentation Associates (United States)
2005-2022
Dartmouth College
2018-2021
University of Massachusetts Amherst
2002-2018
Amherst College
2018
Universidade de São Paulo
2002
Ames National Laboratory
2002
Iowa State University
2002
In this paper we elaborate on recently developed molecular switch architectures and how these new systems can help with the realization of functions advancement artificial machines. Progress in chemically photoinduced switches motors is summarized contextualized such that reader may gain an appreciation for novel tools have come about past decade. Many offer distinct advantages over commonly employed switches, including improved fidelity, addressability, robustness. Thus, serves as a...
The glass transition temperature (Tg) of a series polyacrylate- and polymethacrylate-based polymers having bistable hydrazone photoswitches as pendants increases upon photoisomerization. ensuing photohardening the polymeric network was corroborated using nanoindentation measurements. bistability switch allowed us to lock-in sustain multiple Tg values in same material function switch's Z/E isomer ratio, even at elevated temperatures.
We present a strategy for tuning physical properties of P3HT-based copolymers by incorporating fluorinated thiophene repeat unit. The synthesis and characterization series polythiophene P(3HT-co-3H4FT) materials are described, where the percentage units in polymer backbone is systematically varied from 0 to 100%. These P(3HT-co-3H4FT)s (P0, P25, P50, P75, P100) were synthesized via direct arylation polymerization (DArP) methods. By varying feed ratio two monomers, percent (3H4FT) could be...
We present the synthesis and characterization of poly(2-alkyl-benzimidazole-alt-9,9-dihexylfluorene). An improved microwave-assisted monomers 4,7-dibromo-2-heptyl-1H-benzo[d]imidazole 4,7-dibromo-2-(heptan-3-yl)-1H-benzo[d]imidazole was developed. The were polymerized with 9,9-dihexylfluorene-2,7-diboronic acid bis(1,3-propanediol) ester using Suzuki cross-coupling to yield corresponding poly(2-alkyl-benzimidazole-alt-9,9-dihexylfluorene)s. polymers characterized by both traditional optical...
We describe the synthesis and characterization of three new alternating copolymers containing fluorene a dually dopable benzimidazole moiety. Poly(2-n-heptyl-benzimidazole-alt-9,9-di-n-octylfluorene) (PBIF), poly(2-n-heptyl-benzimidazole-vinylene-9,9-di-n-octylfluorene) (PBIF-VL), poly(2-n-heptyl-benzimidazole-ethynylene-9,9-di-n-octylfluorene) (PBIF-EL) were synthesized from Suzuki, Heck, Sonogashira cross-coupling reactions in reasonable yield. The materials characterized through...
A reproducible synthetic method affording end-functionalized conjugated polymers <italic>via</italic> Stille polycondensations based upon end-capping reagent relative kinetics is presented.
We have developed a very low noise preamplifier that meets the low-cost, high-density requirements for use with superconducting tunnel junction (STJ) arrays. The design allows STJs' bias points to be digitally set at μV level. then trace out versus curves under computer control and, by showing correlation between this and detector energy resolution, establish ability automatically select optimum STJ operating points. Working 75 μm × Ta x-ray absorber, we achieved better than 7 eV FWHM 525...
ABSTRACT The synthesis of two new conjugated polymers based on the relatively under‐exploited monomer, 5,8‐dibromo‐2‐[5‐(2‐hexyldecyl)‐2‐thienyl]‐1 H ‐dithieno[3,2‐ e :2′,3′‐ g ]benzimidazole (dithienobenzimidazole, DTBI ), and either 4,7‐bis[4‐hexyl‐5‐(trimethylstannyl)‐2‐thienyl]‐2,1,3‐benzothiadiazole ( BTD ) or 2,6‐bis(trimethylstannyl)‐4,8‐bis(5‐(2‐ethylhexyl) thiophen‐2‐yl)benzo[1,2‐ b :4,5‐ ′]dithiophene BDT is described. were synthesized via Stille polycondensation characterized by...
ADVERTISEMENT RETURN TO ISSUEPREVNoteNMR Characterization of Sodium Poly(α-l-glutamate)/Poly(ethylene oxide) BlendsJ. Harris, J. Bonagamba, and K. Schmidt-RohrView Author Information Polymer Science Engineering Department, University Massachusetts, Amherst, Massachusetts 01003; Instituto de Física São Carlos, Universidade Paulo, Brazil, Caixa Postal 369, 13560-970; Chemistry Department Ames Laboratory, Iowa State University, Ames, 50011 Cite this: Macromolecules 2002, 35, 14,...
The BeEST experiment is a precision laboratory search for physics beyond the standard model that measures electron capture decay of $^7$Be implanted into superconducting tunnel junction (STJ) detectors. For Phase-III experiment, we constructed continuously sampling data acquisition system to extract pulse shape and timing information from 16 STJ pixels offline. Four additional are read out with fast list-mode digitizer, one nuclear MCA already used in earlier limit-setting phases experiment....
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