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5. Towards colloidal self-assembly for functional materials

Author

Ruff, Zachary, Eiser, Erika, and Grey, Clare P.

Subjects
620.1, colloids, DNA, self-assembly, structural color
Abstract

Nanostructuring has led to materials with novel and improved materials properties driving innovation across fields as varied as transportation, computing, energy and biotechnology. However, the benefits of nanostructured material have not widely been extended into large-scale, three-dimensional applications as deterministic pattern techniques have proven too expensive for devices outside of high value products. This thesis explores how colloidal self-assembly can be used to form macroscopic functional materials with short-range order for electronic, photonic and electrochemical applications at scale. DNA-functionalized nanoparticles are versatile models for exploring colloidal self-assembly due to the highly specific, tunable and thermally reversible binding between DNA strands. Gold nanoparticles coated with DNA were used to investigate the temperature-dependent interaction potentials and the gel formation in DNA-colloidal systems. The electronic conductivity and the plasmonic response of the DNA-gold gels were studied to explore their applicability as porous electrodes and SERS substrates, respectively. Subsequently, silica nanoparticles were assembled into nanostructures that preferentially scatter blue light using both DNA and polymer-colloid interactions. Finally, rod-sphere structures made from DNA-coated gold nanoparticles and viruses were explored, demonstrating how high-aspect ratio building blocks can create composite structures with increased porosity. The gold-virus gel structures inspired the design and assembly of a silicon-carbon nanotube composite material using covalent bonds that shows promise for high energy density anodes.

Published
2018
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6. Figure 3 from: Weldy M, Denton T, Fleishman AB, Tolchin J, McKown M, Spaan RS, Ruff ZJ, Jenkins JMA, Betts MG, Lesmeister DB (2024) Audio tagging of avian dawn chorus recordings in California, Oregon and Washington. Biodiversity Data Journal 12: e118315. https://doi.org/10.3897/BDJ.12.e118315

Author

Weldy, Matthew, primary, Denton, Tom, additional, Fleishman, Abram, additional, Tolchin, Jaclyn, additional, McKown, Matthew, additional, Spaan, Robert, additional, Ruff, Zachary, additional, Jenkins, Julianna, additional, Betts, Matthew, additional, and Lesmeister, Damon, additional

Published
2024
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9. GADD45A is a mediator of mitochondrial loss, atrophy, and weakness in skeletal muscle

Author

Marcotte, George R., primary, Miller, Matthew J., additional, Kunz, Hawley E., additional, Ryan, Zachary C., additional, Strub, Matthew D., additional, Vanderboom, Patrick M., additional, Heppelmann, Carrie J., additional, Chau, Sarah, additional, Von Ruff, Zachary D., additional, Kilroe, Sean P., additional, McKeen, Andrew T., additional, Dierdorff, Jason M., additional, Stern, Jennifer I., additional, Nath, Karl A., additional, Grueter, Chad E., additional, Lira, Vitor A., additional, Judge, Andrew R., additional, Rasmussen, Blake B., additional, Nair, K. Sreekumaran, additional, Lanza, Ian R., additional, Ebert, Scott M., additional, and Adams, Christopher M., additional

Published
2023
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10. STEM Education: Attracting and Retaining Female Students in Secondary STEM Programs

Author

Ruff, Zachary A.

Abstract

This narrative case study examines a high achieving STEM based high school and its ability to attract, retains, and engage female students. Given the recent importance placed on STEM graduates and STEM careers it is important for schools to understand how they can engage traditionally underserved minorities in STEM fields. The research used a series of semi-structured interviews in an attempt to understand the point of view of the female student participants to try to comprehend the factors that allowed one school to not only attract female students to its program, but also to retain them and keep them engaged throughout their education. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]

Published
2017

11. O3 to O1 Phase Transitions in Highly Delithiated NMC811 at Elevated Temperatures

Author

Ruff, Zachary, Coates, Chloe S, Märker, Katharina, Mahadevegowda, Amoghavarsha, Xu, Chao, Penrod, Megan E, Ducati, Caterina, Grey, Clare P, Ruff, Zachary [0000-0001-9097-3735], Xu, Chao [0000-0001-5416-5343], Ducati, Caterina [0000-0003-3366-6442], Grey, Clare P [0000-0001-5572-192X], and Apollo - University of Cambridge Repository

Subjects
34 Chemical Sciences, 3406 Physical Chemistry, 4016 Materials Engineering, 40 Engineering
Abstract

Nickel-rich layered oxide cathodes such as NMC811 (LixNi0.8Mn0.1Co0.1O2) currently have the highest practical capacities of cathodes used commercially, approaching 200 mAh/g. Lithium is removed from NMC811 via a solid-solution behavior when delithiated to xLi > 0.10, maintaining the same layered (O3 structure) throughout as observed via operando diffraction measurements. Although it is possible to further delithiate NMC811, it is kinetically challenging, and there are significant side reactions between the electrolyte and cathode surface. Here, small format, NMC811-graphite pouch cells were charged to high voltages at elevated temperatures and held for days to access high states of delithiation. Rietveld refinements on high-resolution diffraction data and indexing of selected area electron diffraction patterns, both acquired ex situ, show that NMC811 undergoes a partial and reversible transition from the O3 to the O1 phase under these conditions. The O1 phase fraction depends not only on the concentration of intercalated lithium but also on the hold temperature and hold time, indicating that the phase transition is kinetically controlled. 1H NMR spectroscopy shows that the proton concentration decreases with O1 phase fraction and is not, therefore, likely to be driving the O3-O1 phase transition.

Published
2023
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15. Understanding improved capacity retention at 4.3 V in modified single crystal Ni-rich NMC//graphite pouch cells at elevated temperature

Author

Páez Fajardo, Galo J., primary, Belekoukia, Meltiani, additional, Bolloju, Satish, additional, Fiamegkou, Eleni, additional, Menon, Ashok S., additional, Ruff, Zachary, additional, Shen, Zonghao, additional, Shah, Nickil, additional, Björklund, Erik, additional, Zuba, Mateusz Jan, additional, Lee, Tien-Lin, additional, Thakur, Pardeep K., additional, Weatherup, Robert S., additional, Aguadero, Ainara, additional, Loveridge, Melanie J., additional, Grey, Clare P., additional, and Piper, Louis F. J., additional

Published
2023
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19. Improving Capacity Retention at 4.3 V in Modified Single Crystal Ni-Rich Nmc//Graphite Pouch Cells

Author

Paez Fajardo, Galo J., primary, Belekoukia, Meltiani, additional, Fiamegkou, Eleni, additional, Menon, Ashok S., additional, Ruff, Zachary, additional, Shen, Zonghao, additional, Shah, Nickil Ajit, additional, Björklund, Erik, additional, Zuba, Mateusz Jan, additional, Lee, Tien-Lin, additional, Thakur, Pardeep K., additional, Weatherup, Robert S., additional, Aguadero, Ainara, additional, Loveridge, Melanie J., additional, Grey, Clare P., additional, and Piper, Louis, additional

Published
2022
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30. STEM Education

Author

Ruff, Zachary Allen

Subjects
education, ComputingMilieux_COMPUTERSANDEDUCATION, Gender studies, Educational evaluation, Women in science--Study and teaching, Education, Science--Study and teaching (Secondary)
Abstract

This narrative case study examines a high achieving STEM based high school and its ability to attract, retains, and engage female students. Given the recent importance placed on STEM graduates and STEM careers it is important for schools to understand how they can engage traditionally underserved minorities in STEM fields. The research used a series of semi-structured interviews in an attempt to understand the point of view of the female student participants to try to comprehend the factors that allowed one school to not only attract female students to its program, but also to retain them and keep them engaged throughout their education.

Published
2017
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31. Simulating the Effort Necessary to Detect Changes in Northern Spotted Owl (Strix occidentalis caurina) Populations Using Passive Acoustic Monitoring.

Author

Lesmeister, Damon B., Appel, Cara L., Davis, Raymond J., Yackulic, Charles B., and Ruff, Zachary J.

Subjects
NORTHERN spotted owl, BIRD populations, WILDLIFE monitoring, BIODIVERSITY, SIMULATION methods & models
Abstract

Passive acoustic monitoring is a promising method for monitoring rare and nocturnal species, and for tracking changes in forest wildlife biodiversity. We conducted simulations to compare and evaluate various passive acoustic sampling designs effectiveness for monitoring spotted owl (Strix occidentalis caurina) population trends. We found that each design was effective for detecting a decline (or stability) in spotted own populations within 10 years with even a moderate amount of sampling. There are however, important considerations and tradeoffs among the various design options. Often, estimated changes in use of the landscape were biased with a consistently lower magnitude of change compared to simulated changes in the population. Although this method has challenges, passive acoustic monitoring can be used to effectively monitor northern spotted owls in the Pacific Northwest. [ABSTRACT FROM AUTHOR]

Published
2021

32. Automated identification of avian vocalizations with deep convolutional neural networks.

Author

Ruff, Zachary J., Lesmeister, Damon B., Duchac, Leila S., Padmaraju, Bharath K., Sullivan, Christopher M., Pettorelli, Nathalie, and Lecours, Vincent

Subjects
AVIAN anatomy, WILDLIFE monitoring, ELECTRONIC data processing
Abstract

Passive acoustic monitoring is an emerging approach to wildlife monitoring that leverages recent improvements in automated recording units and other technologies. A central challenge of this approach is the task of locating and identifying target species vocalizations in large volumes of audio data. To address this issue, we developed an efficient data processing pipeline using a deep convolutional neural network (CNN) to automate the detection of owl vocalizations in spectrograms generated from unprocessed field recordings. While the project was initially focused on spotted and barred owls, we also trained the network to recognize northern saw‐whet owl, great horned owl, northern pygmy‐owl, and western screech‐owl. Although classification performance varies across species, initial results are promising. Recall, or the proportion of calls in the dataset that are detected and correctly identified, ranged from 63.1% for barred owl to 91.5% for spotted owl based on raw network output. Precision, the rate of true positives among apparent detections, ranged from 0.4% for spotted owl to 77.1% for northern saw‐whet owl based on raw output. In limited tests, the CNN performed as well as or better than human technicians at detecting owl calls. Our model output is suitable for developing species encounter histories for occupancy models and other analyses. We believe our approach is sufficiently general to support long‐term, large‐scale monitoring of a broad range of species beyond our target species list, including birds, mammals, and others. [ABSTRACT FROM AUTHOR]

Published
2020
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33. Sample Dependence of Magnetism in the Next-Generation Cathode Material LiNi0.8Mn0.1Co0.1O2

Author

Mukherjee, Paromita, Paddison, Joseph A. M., Xu, Chao, Ruff, Zachary, Wildes, Andrew R., Keen, David A., Smith, Ronald I., Grey, Clare P., and Dutton, Siân E.

Abstract

We present a structural and magnetic study of two batches of polycrystalline LiNi0.8Mn0.1Co0.1O2(commonly known as Li NMC 811), a Ni-rich Li ion battery cathode material, using elemental analysis, X-ray and neutron diffraction, magnetometry, and polarized neutron scattering measurements. We find that the samples, labeled S1 and S2, have the composition Li1–xNi0.9+x–yMnyCo0.1O2, with x= 0.025(2), y= 0.120(2) for S1 and x= 0.002(2), y= 0.094(2) for S2, corresponding to different concentrations of magnetic ions and excess Ni2+in the Li+layers. Both samples show a peak in the zero-field-cooled (ZFC) dc susceptibility at 8.0(2) K, but the temperature at which the ZFC and FC (field-cooled) curves deviate is substantially different: 64(2) K for S1 and 122(2) K for S2. The ac susceptibility measurements show that the transition for S1 shifts with frequency whereas no such shift is observed for S2 within the resolution of our measurements. Our results demonstrate the sample dependence of magnetic properties in Li NMC 811, consistent with previous reports on the parent material LiNiO2. We further establish that a combination of experimental techniques is necessary to accurately determine the chemical composition of next-generation battery materials with multiple cations.

Published
2021
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34. Effect of Inert Tails on the Thermodynamics of DNA Hybridization

Author

Di Michele, Lorenzo, Mognetti, Bortolo Matteo, Yanagishima, Taiki, Varilly, Patrick, Ruff, Zachary, Frenkel, Daan, Eiser, Erika, Di Michele, Lorenzo, Mognetti, Bortolo Matteo, Yanagishima, Taiki, Varilly, Patrick, Ruff, Zachary, Frenkel, Daan, and Eiser, Erika

Abstract

The selective hybridization of DNA is of key importance for many practical applications such as gene detection and DNA-mediated self-assembly. These applications require a quantitative prediction of the hybridization free energy. Existing methods ignore the effects of non-complementary ssDNA tails beyond the first unpaired base. We use experiments and simulations to show that the binding strength of complementary ssDNA oligomers is altered by these sequences of non-complementary nucleotides. Even a small number of non-binding bases are enough to raise the hybridization free energy by approximately 1 kcal/mol at physiological salt concentrations. We propose a simple analytical expression that accounts quantitatively for this variation as a function of tail length and salt concentration. © 2014 American Chemical Society., SCOPUS: ar.j, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2014

36. Asymmetric wave propagation in planar chiral fibers

Author

Massachusetts Institute of Technology. Department of Mathematics, Massachusetts Institute of Technology. Research Laboratory of Electronics, Shemuly, Dana, Stolyarov, Alexander Mark, Johnson, Steven G., Fink, Yoel, Shapira, Ofer, Ruff, Zachary M., Spektor, Grisha, Massachusetts Institute of Technology. Department of Mathematics, Massachusetts Institute of Technology. Research Laboratory of Electronics, Shemuly, Dana, Stolyarov, Alexander Mark, Johnson, Steven G., Fink, Yoel, Shapira, Ofer, Ruff, Zachary M., and Spektor, Grisha

Abstract

We demonstrate the realization of a two-dimensional chiral optical waveguide with an infinite translational symmetry that exhibits asymmetric wave propagation. The low-symmetry geometry of the cross-section that lacks any rotational and mirror symmetries shows in-principal directional asymmetric polarization rotation. We use general symmetry arguments to provide qualitative analysis of the waveguide's eigenstates and numerically corroborate this using finite element simulation. We show that despite the only perturbative break of time-reversal symmetry via small modal losses, the structure supports a non-degenerate pair of co-rotating elliptical modes. We fabricated meters long fiber with a spiral structure and studied its optical properties., National Science Foundation (U.S.). Materials Research Science and Engineering Centers (Program) (Award DMR-0819762), Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies (Contract W911NF-07-D-0004)

Published
2013

37. Preparation and transmission of low-loss azimuthally polarized pure single mode in multimode photonic band gap fibers

Author

Massachusetts Institute of Technology. Research Laboratory of Electronics, Shemuly, Dana, Stolyarov, Alexander Mark, Wei, Lei, Fink, Yoel, Shapira, Ofer, Ruff, Zachary M., Massachusetts Institute of Technology. Research Laboratory of Electronics, Shemuly, Dana, Stolyarov, Alexander Mark, Wei, Lei, Fink, Yoel, Shapira, Ofer, and Ruff, Zachary M.

Abstract

We demonstrate the preparation and transmission of the lowest loss azimuthally polarized TE[subscript 01-] like mode in a photonic band gap (PBG) fiber. Using the nature of the mode and the properties of the band gap structure we construct a novel coupler that operates away from the band gap's center to enhance the differential losses and facilitate the radiative loss of hybrid fundamental fiber modes. Remarkably, even though the coupler is highly multimoded, a pure azimuthally polarized mode is generated after only 17cm. Theoretical calculations verify the validity of this technique and accurately predict the coupling efficiency. The generation and single mode propagation of this unique azimuthally polarized, doughnut shaped mode in a large hollow-core fiber can find numerous applications including in optical microscopy, optical tweezers, and guiding particles along the fiber., National Science Foundation (U.S.). Materials Research Science and Engineering Centers (Program) (Award DMR-0819762), Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies (Contract W911NF-07-D-0004)

Published
2013

38. Photonic bandgap fibers for transmitting high peak-power pulses in the near infrared

Author

Yoel Fink., Massachusetts Institute of Technology. Dept. of Materials Science and Engineering., Ruff, Zachary, Yoel Fink., Massachusetts Institute of Technology. Dept. of Materials Science and Engineering., and Ruff, Zachary

Abstract

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2010., Includes bibliographical references (p. [41-42])., Hollow-core photonic bandgap fibers (PBG) offer the opportunity to suppress highly the optical absorption and nonlinearities of their constituent materials, which makes them viable candidates for transmitting high-peak power pulses. This thesis demonstrates the fabrication and characterization of polymer-composite PBG fibers in a novel materials system, polycarbonate and arsenic sulfide glass. Propagation losses for the 60pm-core fibers are less than 2dB/m, a 52x improvement over previous PBG fibers at this wavelength. Through preferential coupling the fiber is capable of operating with over 97% the fiber's power output in the fundamental (HE,,) mode. The fiber transmitted pulses with peak powers of 11.4 MW before failure., by Zachary Ruff., S.M.

Published
2010

39. Photonic Crystals for Infrared Nonlinear Optics

Author

MASSACHUSETTS INST OF TECH CAMBRIDGE, Fink, Yoel, Soljacic, Marin, Rakich, Peter T., Abouraddy, Ayman, Ruff, Zachary, Shopira, Ofer, MASSACHUSETTS INST OF TECH CAMBRIDGE, Fink, Yoel, Soljacic, Marin, Rakich, Peter T., Abouraddy, Ayman, Ruff, Zachary, and Shopira, Ofer

Abstract

Here we summarize our progress in the development of 2- to 5-micron wavelength supercontinuum sources through grant number FA8650-05-C-5426 over the life of the program. The key developments over the past 3 years include 1) A proof-of-principle demonstration of a novel, efficient mid-IR Raman laser source in silica materials system, yielding efficient spectral transfer to 2.41 microns. (The demonstrated system can be naturally extended in wavelength to 5microns and beyond); 2) The development of nonlinear-optical simulation capabilities; 3) Progress toward the development of low loss, highly nonlinear chalcogenide fibers; 4) Novel interferometric measurement techniques to examine the integrity and loss mechanisms of such fibers; and 5) Nonlinear studies of chalcogenide fibers and prospects for extending our cascaded Raman source to longer wavelengths.

Published
2009

43. Piezoelectric Multimaterial Fibers

Author

Chocat, Noémie, primary, Wang, Zheng, additional, Egusa, Shunji, additional, Ruff, Zachary M., additional, Stolyarov, Alexander M., additional, Shemuly, Dana, additional, Sorin, Fabien, additional, Rakich, Peter T., additional, Joannopoulos, John D., additional, and Fink, Yoel, additional

Published
2011
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47. Cover Picture: The Complex Role of Aluminium Contamination in Nickel‐Rich Layered Oxide Cathodes for Lithium‐Ion Batteries (Batteries & Supercaps 12/2021).

Author

Lee, Juhan, Amari, Houari, Bahri, Mounib, Shen, Zonghao, Xu, Chao, Ruff, Zachary, Grey, Clare P., Ersen, Ovidiu, Aguadero, Ainara, Browning, Nigel D., and Mehdi, B. Layla

Subjects
LITHIUM-ion batteries, CATHODES, ALUMINUM, TRANSITION metal oxides, OXIDES, STORAGE batteries
Abstract

Keywords: aluminium coating; Li-ion batteries; layered oxides; NMC811; Ni-rich cathodes EN aluminium coating Li-ion batteries layered oxides NMC811 Ni-rich cathodes 1781 1781 1 12/07/21 20211201 NES 211201 B The Front Cover b demonstrates the impact of Al impurities on the nickel-rich NMC cathodes. Cover Picture: The Complex Role of Aluminium Contamination in Nickel-Rich Layered Oxide Cathodes for Lithium-Ion Batteries (Batteries & Supercaps 12/2021) Aluminium coating, Li-ion batteries, layered oxides, NMC811, Ni-rich cathodes. [Extracted from the article]

Published
2021
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48. Transition Metal Dissolution and Degradation in NMC811-Graphite Electrochemical Cells

Author

Clare P. Grey, Chao Xu, Zachary Ruff, Ruff, Zachary [0000-0001-9097-3735], Xu, Chao [0000-0001-5416-5343], Grey, Clare P. [0000-0001-5572-192X], Apollo - University of Cambridge Repository, and Grey, Clare [0000-0001-5572-192X]

Subjects
Materials science, 34 Chemical Sciences, Renewable Energy, Sustainability and the Environment, Batteries and Energy Storage, Condensed Matter Physics, 4016 Materials Engineering, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Electrochemical cell, Transition metal, Chemical engineering, Materials Chemistry, Electrochemistry, 3406 Physical Chemistry, Degradation (geology), Graphite, Dissolution, 40 Engineering
Abstract

Nickel-rich lithium nickel-manganese-cobalt oxide cathodes, in particular Li(Ni0.8Mn0.1Co0.1)O2 (NMC811), are currently being commercialized as next generation cathode materials, due to their increased capacities compared to current materials. Unfortunately, the higher nickel content has been shown to accelerate cell degradation and a better understanding is needed to maximize cell lifetimes. NMC811/graphite cells were tested under stressed conditions (elevated temperature and cell voltages) to accelerate degradation focusing on transition metal (TM) dissolution from the cathode. Increasing the cell temperature, upper cut-off voltage (UCV) and number of cycles all accelerated capacity fade and diffraction studies showed that under stressed conditions, additional degradation mechanisms beyond lithium loss to the SEI are present. Significant TM dissolution and subsequent deposition on the graphite anode is seen, particularly at stressed conditions. The concentration of TMs in the electrolyte remained invariant with cycling conditions, presumably reflecting the limited solubility of these ions and emphasizing the role that TM deposition on the anode plays in continuing to drive dissolution. Significant deposits of metals from the cell casings and current collectors were also detected at all cycling conditions, indicating that corrosion and metal leaching can be as important as TM dissolution from the active material in some cell formats.

Published
2021
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49. Thermally reversible nanoparticle gels with tuneable porosity showing structural colour

Author

Thomas O'Neill, Erika Eiser, Peter Cloetens, Clare P. Grey, Zachary Ruff, Ruff, Zachary [0000-0001-9097-3735], Grey, Clare [0000-0001-5572-192X], Eiser, Erika [0000-0003-2881-8157], and Apollo - University of Cambridge Repository

Subjects
endocrine system, Materials science, Nanostructure, 0299 Other Physical Sciences, General Physics and Astronomy, Nanoparticle, Nanotechnology, Bioengineering, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, complex mixtures, Colloid, Physical and Theoretical Chemistry, Porosity, Nanoscopic scale, 0306 Physical Chemistry (incl. Structural), FOS: Nanotechnology, digestive, oral, and skin physiology, 021001 nanoscience & nanotechnology, Microstructure, 0104 chemical sciences, body regions, Volume fraction, Nanometre, 0210 nano-technology
Abstract

We present colloidal gels formed from dispersions of PEG- and PEG+DNA-coated silica nanoparticles showing structural colour. The PEG- and PEG+DNA-coated silica colloids are functionalized using exclusively covalent bonds in aqueous conditions. Both sets of colloids self-assemble into thermally-reversible colloidal gels with porosity that can be tuned by changing the colloid volume fraction, although the interaction potentials of the colloids in the two systems are different. Confocal microscopy and image analysis tools are used to characteraize the gels' microstructures. Optical reflection spectroscopy is employed to study the underlying gel nanostructure and to characterize the optical response of the gels. X-ray nanotomography is used to visualize the nanoscale phase separation between the colloid-rich gel branches and the colloid-free gel pores. These nanoparticle gels open new routes for creating structural colour where the gel structure is decoupled from the form factor of the individual colloids. This approach can be extended to create unexplored three dimensional macroscale materials with length scales spanning hundreds of nanometers, which has been difficult to achieve using other methods.

Published
2017

50. Audio tagging of avian dawn chorus recordings in California, Oregon and Washington.

Author

Weldy MJ, Denton T, Fleishman AB, Tolchin J, McKown M, Spaan RS, Ruff ZJ, Jenkins JMA, Betts MG, and Lesmeister DB

Abstract

Background: Declines in biodiversity and ecosystem health due to climate change are raising urgent concerns. In response, large-scale multispecies monitoring programmes are being implemented that increasingly adopt sensor-based approaches such as acoustic recording. These approaches rely heavily on ecological data science. However, developing reliable algorithms for processing sensor-based data relies heavily on labelled datasets of sufficient quality and quantity. We present a dataset of 1,575 dawn chorus soundscape recordings, 141 being fully annotated (n = 32,994 annotations) with avian, mammalian and amphibian vocalisations. The remaining recordings were included to facilitate novel research applications. These recordings are paired with 48 site-level climatic, forest structure and topographic covariates. This dataset provides a valuable resource to researchers developing acoustic classification algorithms or studying biodiversity and wildlife behaviour and its relationship to environmental gradients. The dawn chorus recordings were collected as part of a long-term Northern Spotted Owl monitoring program; this demonstrates the complementary value of harnessing existing monitoring efforts to strengthen biodiversity sampling., New Information: This dataset of dawn chorus soundscape recordings is one of the few open-access acoustic datasets annotated with non-biotic and both interspecific (across species) and intraspecific (within species) bird, mammal and amphibian sonotypes and the first that is paired with climatic, forest structure and topographical covariates extracted at recorder locations. This makes it a valuable resource for researchers studying the dawn chorus and its relationship to the environment.

Published
2024
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