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Mono- and bimetallic nanoparticles were deposited onto different powdered supports by Supercritical Fluid Reactive Deposition (SFRD). Carbon dioxide was used as supercritical solvent and hydrogen as reduction agent. In order to optimize the production process unknown factors influencing the particle and product properties were extensively studied.

Überkritische Fluide, CO2, Nanopartikel, Gold, SilberSupercritical fluids, CO2, nanoparticle, gold, silver

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Nucleic acids (RNA and DNA) and their chemical analogs have been utilized as building materials due to their biocompatibility and programmability. RNA, which naturally possesses a wide range of different functions, is now being widely investigated for its role as a responsive biomaterial which dynamically reacts to changes in the surrounding environment. It is now evident that artificially designed self-assembling RNAs, that can form programmable nanoparticles and supra-assemblies, will play an increasingly important part in a diverse range of applications, such as macromolecular therapies, drug delivery systems, biosensing, tissue engineering, programmable scaffolds for material organization, logic gates, and soft actuators, to name but a few. The current exciting Special Issue comprises research highlights, short communications, research articles, and reviews that all bring together the leading scientists who are exploring a wide range of the fundamental properties of RNA and DNA nanoassemblies suitable for biomedical applications.

logic gates --- nucleic acid computing --- RNA aptamers --- RNA nanotechnology --- glioblastoma multiforme --- gene therapy --- viral vector --- non-viral vector --- gene delivery --- siRNA --- RNA aptamers --- biosensors --- live-cell imaging --- fluorogenic RNA --- riboswitch --- ribozyme --- RNA nanotechnology --- RNA self-assembly --- light-up aptamer --- RNA nanoparticle --- DNA nanotechnology --- nanopores --- biological media --- serum --- stability --- aggregation --- RNA nanotechnology --- aptamers --- cotranscriptional folding --- suicide gene therapy --- non-viral gene delivery --- ganciclovir --- spinal cord tumor --- nucleic acid nanoparticles --- NANPs --- immunostimulation --- dynamic --- conditionally activated --- RNA interference --- RNA nanotechnology --- silver nanoclusters --- fluorescence --- i-motif DNA --- cytosine rich sequences --- RNA --- RNA logic --- conditional activation --- functional RNA --- nucleic acid therapeutic --- small-angle X-ray scattering --- small-angle neutron scattering --- contrast variation --- nucleic acid nanoparticle --- structural characterization --- n/a

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The Tsinghua University–University of Waterloo Joint Research Center for Micro/Nano Energy & Environment Technology (JCMEET) is a platform. It was established on Nov.11, 2017. The Chairperson of University Council of Tsinghua University, Dr. Xu Chen, and the President of the University of Waterloo, Dr. Feridun Hamdullahpur, attended the opening ceremony and unveiled the nameplate for the joint research center on 29th of March, 2018. The research center serves as a platform for researchers at both universities to conduct joint research in the targeted areas, and to meet regularly for information exchange, talent exchange, and knowledge mobilization, especially in the fields of micro/nano, energy, and environmental technologies. The center focuses on three main interests: micro/nano energy technology, micro/nano pollution control technology, and relevant fundamental research. In order to celebrate the first anniversary of the Joint Research Center, we were invited to serve as the Guest Editors of this Special Issue of Materials focusing on the topic of micro/nano-materials for clean energy and environment. It collects research papers from a broad range of topics related to micro/nanostructured materials aimed at future energy resources, low emission energy conversion, energy storage, energy efficiency improvement, air emission control, air monitoring, air cleaning, and many other related applications. This Special Issue provides an opportunity and example for the international community to discuss how to actively address the energy and environment issues that we are facing.

air filtration --- airborne nanoparticle --- particle concentration --- nanofibers --- cellulose nanofiber --- Lyocell fiber --- PM2.5 --- filter paper --- submicro-fiber --- airborne dust --- engine filtration --- loading performance --- potassium-based adsorbent --- load modification --- CO2 adsorption --- failure --- kinetics --- microscopic characteristics --- CaO --- As2O3 --- DFT --- adsorption --- oxygen carrier --- multiscale model --- product island --- oxidation kinetics --- thermal energy storage (TES) --- phase change material (PCM) --- building materials --- passive building systems --- mortar --- concrete --- flame synthesis --- flame stabilizing on a rotating surface (FSRS) --- rotational speed --- particle deposition --- Karlovitz number --- Limestone --- particle size --- sulfation --- TGA --- model --- nanoparticles --- nanoplates --- spectral blue shift --- amalgam --- water quality --- shale --- permeability measurement --- pressure decay method

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Bionanoparticles such as microorganisms and exosomes are recoganized as important targets for clinical applications, food safety, and environmental monitoring. Other nanoscale biological particles, includeing liposomes, micelles, and functionalized polymeric particles are widely used in nanomedicines. The recent deveopment of microfluidic and nanofluidic technologies has enabled the separation and anslysis of these species in a lab-on-a-chip platform, while there are still many challenges to address before these analytical tools can be adopted in practice. For example, the complex matrices within which these species reside in create a high background for their detection. Their small dimension and often low concentration demand creative strategies to amplify the sensing signal and enhance the detection speed. This Special Issue aims to recruit recent discoveries and developments of micro- and nanofluidic strategies for the processing and analysis of biological nanoparticles. The collection of papers will hopefully bring out more innovative ideas and fundamental insights to overcome the hurdles faced in the separation and detection of bionanoparticles.

microfluidic systems --- optically induced dielectrophoresis (ODEP) --- cell isolation --- circulating tumour cells (CTCs) --- cancer metastasis --- flow focusing --- magnetic field --- microparticles --- ferrofluids --- dielectric film --- plastic wrap --- ballpoint pen printing --- conductive electrode --- digital microfluidic chip --- electrowetting --- lipid nanoparticles --- online analysis --- microfluidics --- plug flow mixer --- fluorescence --- precipitation --- single particle analysis --- nanoparticle characterization --- surface acoustic wave --- second-hand smoke --- 3-ethenylpyridine --- oxidized hollow mesoporous carbon nanosphere --- crop disease --- lensfree --- light diffraction --- image processing --- microfluidic --- HIV diagnostics --- cross-flow filtration --- microfluidic device --- COMSOL --- nanoporous membrane --- paper-based microfluidic device --- flow control --- droplet actuation --- multi-step assay --- biomarker detection --- digital microfluidic device --- n/a

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Fossil fuels leaded the 21st century industrial revolution but caused some critical problems such as exhaustion of resources and global warming. Also, current power plants require too much high cost and long time for establishment and facilities to provide electricity. Thus, developing new power production systems with environmental friendliness and low-cost is critical global needs. There are some emerging energy harvesting technologies such as thermoelectric, piezoelectric, and triboelectric nanogenerators, which have great advantages on eco-friendly low-cost materials, simple fabrication, and various operating sources. Since the introduction of various energy harvesting technologies, many novel designs and applications as power suppliers and physical sensors in the world have been demonstrated based on their unique advantages. In this Special Issue, we would like to address and share basic approaches, new designs, and industrial applications related to thermoelectric, piezoelectric, and triboelectric devices which are on-going in Korea. With this Special Issue, we aim to promote fundamental understanding and to find novel ways to achieve industrial product manufacturing for energy harvesters.

energy harvesting --- thermoelectric generator --- railroad vehicle --- rolling stock --- axle bearing --- TiO_2?x nanoparticle --- high dielectric constant --- triboelectric nanogenerators --- oxygen vacancy --- ferroelectric --- PVDF --- piezoelectric --- mechanical fatigue resistance --- remnant polarization --- PVDF --- sensor --- triboelectric nanogenerator --- triboelectric nanogenerator --- nanoimprinting --- nanostructures --- microstructures --- femtosecond laser --- energy harvesting --- triboelectric nanogenerator --- superhydrophobic surface --- spray method --- mechanical energy --- triboelectric nanogenerator --- energy harvesting --- hybrid energy --- water wave energy --- thermoelectric --- layer-by-layer --- graphene --- carbon nanotube --- thin film --- thermoelectric --- graphene --- carbon nanotubes --- power factor --- polymers --- energy harvesting --- organic composites --- mesoporous composite polymer --- metal oxidation --- gapless --- triboelectric nanogenerator --- high deformability --- energy-harvesting metamaterial --- wireless chemical sensor --- metamaterial sensor --- triboelectric generator --- shock absorber --- suspension system --- advanced driver assistance technology --- IoT technology --- frictional force --- n/a