A5011385581- Nuclear physics research studies
- Perovskite Materials and Applications
- Atomic and Molecular Physics
- Quantum Chromodynamics and Particle Interactions
- Quantum Dots Synthesis And Properties
- Advanced NMR Techniques and Applications
- Conducting polymers and applications
- Circadian rhythm and melatonin
- Genetics, Aging, and Longevity in Model Organisms
- Advanced Chemical Physics Studies
- Neuroendocrine regulation and behavior
- Chalcogenide Semiconductor Thin Films
- Surface Modification and Superhydrophobicity
- Crystallography and Radiation Phenomena
- Organic Light-Emitting Diodes Research
- Infrastructure Maintenance and Monitoring
- High-Energy Particle Collisions Research
- Photochromic and Fluorescence Chemistry
- Electrohydrodynamics and Fluid Dynamics
- Photonic and Optical Devices
- X-ray Spectroscopy and Fluorescence Analysis
- Free Radicals and Antioxidants
- Electromagnetic Compatibility and Noise Suppression
- Nanofabrication and Lithography Techniques
- Geotechnical Engineering and Underground Structures
Colorado School of Mines
2021-2022
U.S. Army Engineer Research and Development Center
2019-2020
United States Army
2019-2020
Construction Engineering Research Laboratory
2019-2020
University of Illinois Urbana-Champaign
2020
University of Notre Dame
2009-2017
Cornell University
2014
Heidelberg University
2012
Heidelberg University
2012
VA Office of Research and Development
2011
All-inorganic cesium lead halide (CsPbX3, X = Br–, I–) perovskites could potentially provide comparable photovoltaic performance with enhanced stability compared to organic–inorganic species. However, small-bandgap cubic CsPbI3 has been difficult study due challenges forming in the phase. Here, a low-temperature procedure form developed through exchange reaction using films of sintered CsPbBr3 nanocrystals. The was found be strongly dependent upon temperature, featuring an Arrhenius...
All inorganic cesium lead bromide (CsPbBr3) perovskite is a more stable alternative to methylammonium (MAPbBr3) for designing high open-circuit voltage solar cells and display devices. Poor solubility of CsBr in organic solvents makes typical solution deposition methods difficult adapt constructing CsPbBr3 Our layer-by-layer methodology, which use quantum dot (QD) followed by annealing, provides convenient way cast films desired thickness. The transformation from QDs into bulk during thermal...
Energy transfer coupled with electron is a convenient approach to mimic photosynthesis in light energy conversion. Better understanding of mechanistic details processes important enhance the performance dye or quantum dot-sensitized solar cells. through both long-range dipole-based Förster resonance (FRET) and short-range Dexter (DET) mechanisms have been identified occur between CdSe dots (QDs) linked red-infrared-absorbing squaraine short thiol functional group (SQSH). Solutions SQSH were...
Abstract Numerous natural surfaces have micro/nanostructures that result in extraordinary functionality, such as superhydrophobicity, self‐cleaning, antifogging, and antimicrobial properties. One example is the cicada wing, where differences nanopillar geometry composition among species can impact influence degree of exhibited To understand relationships between surface topography chemical with multifunctionality, wing properties Neotibicen pruinosus (superhydrophobic) Magicicada cassinii...
Resonance energy transfer (RET) has been shown to occur in films of semiconductor quantum dots (QDs) with variation QD composition and size. When coupled charge carrier transfer, RET could provide a complementary strategy for light harvesting based solid state photovoltaic devices. Due direct dependence on the optical properties donor acceptor, surface chemistry plays drastic role determining efficiency RET. Here, impact was investigated using pair different sized CdSe QDs spin-cast onto...
The isoscalar giant monopole resonance (ISGMR) strength distribution in 24Mg has been determined from background-free inelastic scattering of 386-MeV α particles at extreme forward angles, including 0∘. ISGMR observed for the first time to have a two-peak structure light-mass nucleus. This splitting is explained well by microscopic theory terms prolate deformation ground state 24Mg.
Multipole strength distributions for isoscalar $L\ensuremath{\le}2$ transitions in $^{28}\mathrm{Si}$ have been extracted using 386-MeV inelastic $\ensuremath{\alpha}$ scattering at extremely forward angles, including ${0}^{\ensuremath{\circ}}$. Observed are good agreement with microscopic calculations an oblate-deformed ground state. In particular, a large peak excitation energy of 17.7 MeV the giant monopole resonance is consistent calculations.
Nanoimprinting lithography (NIL) is a next-generation nanofabrication method, capable of replicating nanostructures from original master surfaces. Here, we develop highly scalable, simple, and nondestructive NIL using dissolvable template. Termed template nanoimprinting (DT-NIL), our method utilizes an economic thermoplastic resin to fabricate templates, which can be easily dissolved in simple organic solvents. We used the DT-NIL replicate cicada wings have surface nanofeatures ∼100 nm...
Strength distributions for isoscalar giant resonances with multipolarity $L\ensuremath{\le}2$ have been determined in $^{24}\mathrm{Mg}$ from ``instrumental background-free'' inelastic scattering of 386-MeV $\ensuremath{\alpha}$ particles at extreme forward angles, including ${0}^{\ensuremath{\circ}}$. The $E0, E1$, and $E2$ strengths are observed to be $57\ifmmode\pm\else\textpm\fi{}7%, 111.{1}_{\ensuremath{-}7.2}^{+10.9}%$, $148.6\ifmmode\pm\else\textpm\fi{}7.3%$, respectively, their...
Biofouling disrupts the surface functionality and integrity of engineered substrates. A variety natural materials such as plant leaves insect wings have evolved sophisticated physical mechanisms capable preventing biofouling. Over past decade, several reports pinpointed nanoscale topography an important regulator adhesion growth bacteria. Although artificial nanoengineered features been used to create bactericidal that kill adhered bacteria, functional surfaces synergistically providing...
The development of low-cost materials for charge-selective contacts that provide good energetic alignment with perovskite active layers, favorable thermal properties, and lead to efficient photoconversion is becoming an increasingly important aspect the solar cell (PSC) field. Presented here a series polymers based on one-pot polymerization aryl dihalides primary amines produce solution-processable in high yield, simple purification, promising properties performing P-I-N PSC devices. How...
Isoscalar giant resonances and low spin states in ${}^{32}$S have been measured with inelastic $\ensuremath{\alpha}$ scattering at extremely forward angles including zero degrees $E$${}_{\ensuremath{\alpha}}=386$ MeV. By applying multipole decomposition analysis, various excited are classified according to their spins parities (J${}^{\ensuremath{\pi}}$), discussed relation the superdeformed ${}^{28}$Si $+$ cluster bands.
Cicada wings exhibit several intriguing properties that arise from a combination of nanopillar structures and chemical constituents, including superhydrophobicity, as well antimicrobial, antireflective, self-cleaning functions. While the physical dimensions nanofeatures are relatively simple to characterize through microscopy, chemicals cover these pillars more difficult due variety complexity mixture. Here, we compared extractable wing surfaces two different cicada species using both gas...
As lead halide perovskites (LHPs) continue to achieve success as a light-harvesting material in perovskite solar cells (PSCs), exploring and understanding other materials the device stack become increasingly important. Particularly, selection of suitable hole transport (HTMs) that demonstrate high performance stability is imperative design P–I–N PSCs. Presented here are family 12 structurally related polymers based on either fluorene or carbazole main chains with select aromatic side groups...
The development and lifespan of C. elegans are controlled by the nuclear hormone receptor DAF-12, an important model for vertebrate vitamin D liver X receptors. As with its mammalian homologues, DAF-12 function is regulated bile acid-like steroidal ligands; however, tools investigating their biosynthesis in vivo lacking. A flexible synthesis ligands masked ligand derivatives that enable precise temporal control was developed. For masking, photocleavable amides...
Proton decay from the $3\ensuremath{\hbar}\ensuremath{\omega}$ isoscalar giant dipole resonance (ISGDR) in $^{58}\mathrm{Ni}$ has been measured using ($\ensuremath{\alpha},{\ensuremath{\alpha}}^{'}p$) reaction at a bombarding energy of 386 MeV to investigate its properties. We have extracted ISGDR strength under coincidence condition between inelastically scattered $\ensuremath{\alpha}$ particles forward angles and protons emitted backward angles. Branching ratios for proton low-lying states...
Abstract The development and lifespan of C. elegans are controlled by the nuclear hormone receptor DAF‐12, an important model for vertebrate vitamin D liver X receptors. As with its mammalian homologues, DAF‐12 function is regulated bile acid‐like steroidal ligands; however, tools investigating their biosynthesis in vivo lacking. A flexible synthesis ligands masked ligand derivatives that enable precise temporal control was developed. For masking, photocleavable amides 5‐methoxy‐ N...
In dieser Zuschrift wurde der Beitrag, in dem Kurzchalia und Knölker et al. die erste Synthese von “Δ1,7-dafachronic acid” (dafa#3) ihre starke biologische Aktivität beschreiben,10g nicht zitiert. Lit. 10 muss richtigerweise lauten:
The isoscalar giant monopole resonance (ISGMR) strength distribution in $^{24}$Mg has been determined from background-free inelastic scattering of 386-MeV $\alpha$ particles at extreme forward angles, including 0$^{\circ}$. ISGMR observed for the first time to have a two-peak structure light-mass nucleus. This splitting is explained well by microscopic theory terms prolate deformation ground state $^{24}$Mg.