12 results match your criteria: "Chungnam National University 99 Daehak-ro[Affiliation]"

3D hierarchically porous magnetic molybdenum trioxide@gold nanospheres as a nanogap-enhanced Raman scattering biosensor for SARS-CoV-2.

Nanoscale Adv

February 2022

Research Institute of Green Science and Technology, Shizuoka University 836 Ohya, Suruga-ku Shizuoka 422-8529 Japan +81-54-238-4887 +81-54-238-3306.

The global pandemic of COVID-19 is an example of how quickly a disease-causing virus can take root and threaten our civilization. Nowadays, ultrasensitive and rapid detection of contagious pathogens is in high demand. Here, we present a novel hierarchically porous 3-dimensional magnetic molybdenum trioxide-polydopamine-gold functionalized nanosphere (3D mag-MoO-PDA@Au NS) composed of plasmonic, semiconductor, and magnetic nanoparticles as a multifunctional nanosculptured hybrid.

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Fine control of structural and morphological features in electrochromic materials is of paramount importance for realizing practical electrochromic devices (ECDs), which can dynamically adjust indoor light and temperature of buildings. To this end, herein we investigate impacts of two variants such as Ti-doping amount and the annealing temperature on physical and chemical properties of sol-gel derived electrochromic WO films. We use a wide range of titanium coupling agents (TCAs) as Ti-dopants ranging from 0 wt% to 20 wt% and vary the annealing temperature between 200 °C and 400 °C with 50 °C interval.

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Article Synopsis
  • The formation of an additional phase, (CHNH)MnCl, occurs when the concentration of Mn dopant increases, hindering the creation of Mn-doped CHNHPbCl nanocrystals (NCs).
  • By altering the order in which MnCl is added during the crystal growth process, this new approach can help prevent the emergence of the unwanted impurity phase.
  • This method enhances the potential for successfully synthesizing Mn-doped CHNHPbCl NCs without contamination.
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Formation of arsenic clusters in InAs nanowires with an AlO shell.

RSC Adv

December 2020

Graduate School of Analytical Science and Technology (GRAST), Chungnam National University 99 Daehak-ro, Yuseong-gu Daejeon 34134 Republic of Korea

An in-depth understanding of thermal behavior and phase evolution is required to apply heterostructured nanowires (NWs) in real devices. The intermediate status during the vaporization process of InAs NWs in an AlO shell was studied by conducting quenching during heating experiments, using a transmission electron microscope. The formation of As clusters in the amorphous AlO shell was confirmed by analyzing the high-angle annular dark field images and energy-dispersive X-ray spectra.

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Cheap, facile, and upscalable activated carbon-based photothermal layers for solar steam generation.

RSC Adv

November 2020

Graduate School of Energy Science and Technology, Chungnam National University 99 Daehak-ro, Yuseong-gu Daejeon 34134 Republic of Korea +82-42-821-8610.

Solar-to-steam generation characterized by nanostructured photothermal materials and interfacial heating is developed based on various carbon nanostructures such as graphene, reduced graphene oxide, CNT, or their combinations. However, multiple and sophisticated synthetic steps are required to generate macroscopic porosity in photothermal devices for the efficient mass transport of water and generated steam. Additionally, the fabrication of photothermal layers on a practical scale constitutes the main hurdle for real applications toward solar-driven desalination.

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In this study, we formulate three-dimensionally (3D) printable composite pastes employing electrostatically assembled-hybrid carbon and a polystyrene-polyisoprene-polystyrene tri-block copolymer elastomer for the fabrication of multi-stack printed piezoresistive pressure sensor arrays. To address a critical drawback of piezoresistive composite materials, we have developed a previously unrecognized strategy of incorporating a non-ionic amphiphilic surfactant, sorbitan trioleate, into composite materials. It is revealed that the surfactant with an appropriate amphiphilic property, represented by the hydrophilic-lipophilic balance (HLB) index of 1.

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Although PEBAX-1657 is one of the promising polymeric materials for selective CO separation, there remain many questions about the optimal polymeric structure and possibility of improving performance without adulterating its basic structure by impregnating inorganic fillers. In order to improve the gas separation performance, low thickness PEBAX membranes were synthesized under steady solvent evaporation conditions by keeping in mind that one of its segments (nylon 6) shows structural variance and molecular orientation with a change in the evaporation rate. Furthermore, phase pure zeolite nanocrystals with cubic (zeolite A) and octahedral (zeolite Y) shapes have been synthesized through liquid phase routes using microwave hydrothermal reactors.

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Intra-arterial ampicillin and gentamicin and the incidence of splenic abscesses following splenic artery embolization: A 20-year case control study.

Clin Imaging

May 2019

Department of Radiology, Division of Vascular and Interventional Radiology, University of Michigan Health System, 1500 East Medical Center Drive, Ann Arbor, MI 48109, United States of America; Cardiovascular and Interventional Radiology, Inova Alexandria Hospital, 4320 Seminary Road, Alexandria, VA 22304, United States of America. Electronic address:

Purpose: Splenic abscesses represent a major complication following splenic artery embolization. The purpose of this study was to assess the effectiveness of intra-arterial antibiotics administered during splenic artery embolization in reducing splenic abscess formation.

Materials And Methods: 406 patients were screened.

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Cell-free nucleic acids (cfNAs) are emerging diagnostic biomarkers for monitoring the treatment and recurrence of cancers. In particular, the biological role and clinical usefulness of cfNAs obtained from the plasma of patients with various cancers are popular and still intensely explored, yet most studies are limited by technical problems during cfNA isolation. A dimethyl dithiobispropionimidate (DTBP)-based microchannel platform that enables spontaneous cfNA capture in 15 min with minimal cellular background and no requirements for use of bulky instruments is reported first.

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Anisotropically compartmentalized microparticles have attracted increasing interest in areas ranging from sensing, drug delivery, and catalysis to microactuators. Herein, a facile method is reported for the preparation of helically decorated microbuilding blocks, using a modified electrohydrodynamic cojetting method. Bicompartmental microfibers are twisted in situ, during electrojetting, resulting in helical microfibers.

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Carbon-based sunlight absorbers in solar-driven steam generation have recently attracted much attention due to the possibility of huge applications of low-cost steam for medical sterilization or sanitization, seawater desalination, chemical distillation, and water purification. In this minireview, recent developments in carbon-based sunlight absorbers in solar-driven steam generation systems are reviewed, including graphene, graphite, carbon nanotubes, other carbon materials, and carbon-based composite materials, highlighting important contributions worldwide that promise low-cost, efficient, robust, reusable, chemically stable, and excellent broadband solar absorption. Furthermore, the crucial challenges associated with employing carbon materials in this field are emphasized.

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Design of Reduction Process of SnO by CH for Efficient Sn Recovery.

Sci Rep

October 2017

Department of Materials Science and Engineering, Chungnam National University 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea.

We design a novel method for the CH reduction of SnO for the efficient recovery of Sn from SnO through a study combining theory and experiment. The atomic-level process of CH-SnO interaction and temperature-dependent reduction behavior of SnO were studied with a combination of a multi-scale computational method of thermodynamic simulations and density functional theory (DFT) calculations. We found that CH was a highly efficient and a versatile reducing agent, as the total reducing power of CH originates from the carbon and hydrogen of CH, which sequentially reduce SnO.

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