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  • Author(s):
    Courtney Hollar, Zhaoyang Lin, Madhusudan Kongara, Tony Varghese, Chinnathambi Karthik, Jess Schimpf, Josh Eixenberger, Paul Davis, Yaqio Wu, Xiangfeng Duan, Yanliang Zhang, David Estrada
    Abstract:

    Thermoelectric generators are an environmentally friendly and reliable solid-state energy conversion technology. Flexible and low-cost thermoelectric generators are especially suited to power flexible electronics and sensors using body heat or other ambient heat sources. Bismuth telluride (Bi2Te3) based thermoelectric materials exhibit their best performance near room temperature making them an ideal candidate to power wearable electronics and sensors using body heat. In this report, Bi2Te3 t…

    Date Published:
    2020-05
    Record Visibility:
    Public
  • Author(s):
    Ilia Pavlovetc, Michael Brennan, Seriu Draguta, Anthony Ruth, Taylor Moot, Jeffrey A. Christians, Kyle Aleshire, Steve Harvey, Stefano Toso, Sanjini Nanyakkara, Jonah Messinger, Joseph Luther, Marsaru Kuno
    Abstract:

    on migration represents an intrinsic instability of metal halide perovskite solar cells. Here we show that triple-cation FAxMAyCs1-x-yPbI3 [FA+ = (NH2)2CH+, MA+ = CH3NH3+] active layers with mixed orthorhombic, post-perovskite (δortho-CsPbI3), and cubic perovskite (α) phases (i.e., α/δ-phase FAxMAyCs1-x-yPbI3) exhibit improved cation stability against applied bias relative to pure α-phase perovskites (i.e., FA0.85Cs0.15PbI3 and FA0.76MA0.15Cs0.09PbI3). Infrared photothermal heterodyne imaging…

    Date Published:
    2020-08
    Record Visibility:
    Public
  • Author(s):
    Seung-Ryong Kwon, Seol Baek, Kaiyu Fu, Paul Bohn
    Abstract:

    Understanding water behavior in confined volumes is important in applications ranging from water purification to healthcare devices. Especially relevant are wetting and dewetting phenomena which can be switched by external stimuli, such as light and electric fields. Here, these behaviors are exploited for electrochemical processing by voltage-directed ion transport in nanochannels contained within nanopore arrays in which each nanopore presents three electrodes. The top and middle electrodes …

    Date Published:
    2020-04
    Record Visibility:
    Public
  • Author(s):
    Ramesh Shrestha, Yuxuan Luan, Xiao Luo, Summi Shi, Teng Zhang, Phil Smith, Wei Gong, Michael Bockstaller, Tenfei Luo, Renkun Chen, Kedar Hippalgaonkar, Shen Shen
    Abstract:

    Thermal rectification is an exotic thermal transport phenomenon which allows heat to transfer in one direction but block the other. We demonstrate an unusual dual-mode solid-state thermal rectification effect using a heterogeneous “irradiated-pristine” polyethylene nanofiber junction as a nanoscale thermal diode, in which heat flow can be rectified in both directions by changing the working temperature. For the nanofiber samples measured here, we observe a maximum thermal rectification factor…

    Date Published:
    2020-06
    Record Visibility:
    Public
  • Author(s):
    Chao Tang, Andriy Yaroshchuk, Merlin Bruening
    Abstract:

    Flow through negatively charged nanopores separates Li+and K+with selectivities of up to 70 and Li+passages from 20% to above 100%. Remarkably, both the Li+/K+selectivity and Li+passage initially increase with flow rate, breaking the permeability/selectivity trade-off. Modelling demonstrates that flow through the membranes creates electric fields that retard transport of cations. Selectivity increases with flow rate because the K+electromigration velocity exceeds its convective velocity, but …

    Date Published:
    2020-05
    Record Visibility:
    Public
  • Author(s):
    Stefano Toso, Ilia Pavlovetc, Maksym Zhukovskyi, Sergio Marras, Masaru Kuno, Liberato Mann, Dmitry Baranov
    Abstract:

    Perovskite nanocrystal superlattices (NC SLs) are the nearest real-world approximations to monodisperse NC ensembles. NC SLs thus represent ideal model systems for evaluating the optical and structural stability of CsPb(I1−xBrx)3 NCs at a macroscopic level. Here, photoinduced changes to CsPb(I1−xBrx)3 NC SLs (0 < x < 1.0) are probed via in situ photoluminescence, X-ray diffraction, and electron microscopy. We find that prolonged (∼10−20 h) ultraviolet−visible irradiation causes irrevers…

    Date Published:
    2020-11
    Record Visibility:
    Public
  • Author(s):
    Quinnan Zhang, Shuangjiang Luo, Jennifer Weidman, Ruilan Guo
    Abstract:

    Abstract Zeolite imidazole framework (ZIF-90) nanoparticles were chemically modified by grafting triptycene moieties. The modified nanoparticles were introduced into a triptycene-based polyimide as fillers to generate mixed matrix membranes (MMMs) for gas separation. The incorporation of “hook-like” triptycene moieties in both dispersed and continuous phases led to intimate contact between the two phases and thus defect-free interfacial morphology, due to the supramolecular interlocking and π…

    Date Published:
    2020-07
    Record Visibility:
    Public
  • Author(s):
    Enrico Speri, Jeshina Janardhanan, Cesar Masitas, Valerie Schroeder, Elena Lastochkin, William Wolter, Jed Fisher, Shahriar Mobashery, Mayland Chang
    Abstract:

    A major challenge for chemotherapy of bacterial infections is perturbation of the intestinal microbiota. Clostridioides difficile is a Gram-positive bacterium of the gut that can thrive under this circumstance. Its production of dormant and antibiotic-impervious spores results in chronic disruption of normal gut flora and debilitating diarrhea and intestinal infection. C. difficile is responsible for 12,800 deaths per year in the United States. Here, we report the discovery of 2-(4-(3-(triflu…

    Date Published:
    2020-11
    Record Visibility:
    Public
  • Author(s):
    Seung-Ryong Kwon, Seol Baek, Kaiyu Fu, Paul Bohn
    Abstract:

    Understanding water behavior in confined volumes is important in applications ranging from water purification to healthcare devices. Especially relevant are wetting and dewetting phenomena which can be switched by external stimuli, such as light and electric fields. Here, these behaviors are exploited for electrochemical processing by voltage-directed ion transport in nanochannels contained within nanopore arrays in which each nanopore presents three electrodes. The top and middle electrodes …

    Date Published:
    2020-04
    Record Visibility:
    Public
  • Author(s):
    Minxiang Zeng, Wenzheng Kuang, Irfan Khan, Dali Huang, Yipu Du, Mortaza Seidi-Javash, Lecheng Zhang, Zhengdong Cheng, Anthony Hoffman, Yanliang Zhang
    Abstract:

    Printing techniques using nanomaterials have emerged as a versatile tool for fast prototyping and potentially large-scale manufacturing of functional devices. Surfactants play a significant role in many printing processes due to their ability to reduce interfacial tension between ink solvents and nanoparticles and thus improve ink colloidal stability. Here, a colloidal graphene quantum dot (GQD)-based nanosurfactant is reported to stabilize various types of 2D materials in aqueous inks. In pa…

    Date Published:
    2020-11
    Record Visibility:
    Public
  • Author(s):
    Yini Zhu, Jiling Wen, Jiling Huang, Jackson Mittlesteadt, Xiaofei Wen, XinLu
    Abstract:

    Background: Recent genomic profiling has identified a subtype of prostate cancer (PCa) characterized by two key genetic alterations: missense mutation of speckle-type POZ protein (SPOP) and homozygous deletion of chromodomain helicase DNA-binding protein 1 (CHD1). Mutually exclusive with E26 transformation-specific (ETS) rearrangements, this subtype displays high genomic instability. Previous studies indicate that deficient SPOP or CHD1 alone leads to feeble prostate abnormalities and each pr…

    Date Published:
    2020-09
    Record Visibility:
    Public
  • Author(s):
    Eduard Aleksanyan, Ani Aprahamian, Alexander S. Mukasyan, Vachagan Harutyunyan, Khachatur Manukyan
    Abstract:

    Cesium lead iodide with cubic perovskite structure (a-CsPbI3) is gaining sig- nificant interest in photovoltaic applications due to its excellent absorbance of the visible solar light and other attractive optoelectronic properties. However, the synthesis of stable a-CsPbI3 poses a significant challenge. Mechanochemical synthesis is emerging as a suitable method for the preparation of cesium lead halides. This work investigates the ball milling-induced synthesis of cesium lead halides perovski…

    Date Published:
    2020-04
    Record Visibility:
    Public