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Thermal energy storage using phase change materials (PCMs) is a research topic that has attracted much attention in recent decades. This is mainly due to the potential use of PCMs as latent storage media in a large variety of applications. Although many kinds of PCMs are already commercial products, advanced materials with improved properties and new latent storage concepts are required to better meet the specific requirements of different applications. Moreover, the development of common validation procedures for PCMs is an important issue that should be addressed in order to achieve commercial deployment and implementation of these kinds of materials in latent storage systems. The key subjects addressed on the five papers included in this Special Issue are related to methodologies for material selection, PCM validation and assessment procedures, innovative approaches of PCM applications together with simulation and testing of latent storage prototypes.

Technology: general issues --- thermal energy storage (TES) --- phase change material (PCM) --- heating and cooling --- material selection --- selection methodology --- heat transfer --- high power --- latent heat --- energy storage --- heat exchanger --- lithium-ion battery --- thermal management --- phase change material --- temperature --- heat dissipation fins --- capacity --- phase change materials (PCM) --- latent heat storage --- degradation --- thermal cycling stability --- stable supercooling --- latent heat thermal storage --- pcm --- 0D dynamic model --- multi-energy system --- district heating --- thermal network --- n/a

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Thermal energy storage using phase change materials (PCMs) is a research topic that has attracted much attention in recent decades. This is mainly due to the potential use of PCMs as latent storage media in a large variety of applications. Although many kinds of PCMs are already commercial products, advanced materials with improved properties and new latent storage concepts are required to better meet the specific requirements of different applications. Moreover, the development of common validation procedures for PCMs is an important issue that should be addressed in order to achieve commercial deployment and implementation of these kinds of materials in latent storage systems. The key subjects addressed on the five papers included in this Special Issue are related to methodologies for material selection, PCM validation and assessment procedures, innovative approaches of PCM applications together with simulation and testing of latent storage prototypes.

thermal energy storage (TES) --- phase change material (PCM) --- heating and cooling --- material selection --- selection methodology --- heat transfer --- high power --- latent heat --- energy storage --- heat exchanger --- lithium-ion battery --- thermal management --- phase change material --- temperature --- heat dissipation fins --- capacity --- phase change materials (PCM) --- latent heat storage --- degradation --- thermal cycling stability --- stable supercooling --- latent heat thermal storage --- pcm --- 0D dynamic model --- multi-energy system --- district heating --- thermal network --- n/a

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There is increasingly intensive research for energy storage technologies development due to the enhanced energy needs of the contemporary societies. Increased global energy consumption results in the reduction in the availability of traditional energy resources, such as coal, oil and natural gas. Therefore, there is an urgent need for new systems development based on the conversion and storage of sustainable and clean energy. Phase change materials (PCMs) are one of the key components for the development of advanced sustainable solutions in renewable energy and engineering systems. In order to update the field of renewable energy and engineering systems with the use of PCMs, a Special Issue entitled “Phase Change Materials: Design and Applications” is introduced. This book gathers and reviews the collection of ten contributions (nine articles and one review), with authors from Europe, Asia and Americam accepted for publication in the aforementioned Special Issue of Applied Sciences.

Research & information: general --- Physics --- phase change materials --- thermal energy storage --- energy efficiency --- building applications --- construction materials --- phase-change material --- dispersion --- thermal-mechanical stability --- viscosity --- supercooling --- nucleating agent --- cold storage --- battery cooling --- LPMO --- Fourier Transform ac Voltammetry (FTacV) --- cyclic voltammetry --- Direct Electron Transfer (DET) --- lathrate hydrate --- tetrabutylammonium acrylate (TBAAc) --- crystal growth --- ultrasonic vibration --- polyurethane elastomers --- microencapsulated PCMs --- thermal properties --- mechanical properties --- phase change material --- sugar alcohol --- erythritol --- latent heat storage --- thermal stability --- degradation kinetics --- PCM --- mini-channels --- air --- melting --- solidification --- latent heat thermal energy storage --- phase change materials (PCM) --- macro-encapsulation --- rectangular slab --- experimental study --- sodium nitrate --- thermal conductivity --- microencapsulation --- latent heat --- multicriteria decision --- finite element --- automotive --- energy storage --- 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.

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

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Materials with sound-absorbing or sound-insulating properties have been rapidly evolving in recent years for several reasons. On one side, there is the ever-increasing awareness of the adverse effects that noise and lack of acoustic comfort may have on human health. On the other, the availability of more sophisticated fabrication techniques, calculation methods, and new materials, has stimulated researchers and, more and more frequently, industry to develop customized materials with improved properties.This book collects contributions from different researchers covering several topics. A group of papers investigated the use of 3D printing to obtain perforated panels with extended frequency response, as well as to ideally design an optimized cell distribution to print (when fabrication techniques will make it possible) a porous material with a broader sound absorption. The role of the geometrical and microstructural properties of granular molecular sieves is investigated by another paper. A second group of papers focused its attention on the use of natural or recycled components to create a skeleton of porous materials with good sound-absorbing properties and low environmental impact. Cigarette butts, recycled textile waste, and almond skins have been investigated by different authors.Finally, the last batch of papers included a review of sound insulation properties of innovative concretes and two research papers focussing on a numerical and experimental analysis of wood plastic composite (WPC) panels and on the potential of semi-active solutions employing compressible constrained layer damping (CCLD).

Technology: general issues --- perforated panel --- absorber array --- low frequency absorption --- sound absorber --- cigarette butts --- sustainable material --- recycling --- variability analysis --- textile waste --- biopolymers --- sound absorption --- sustainable materials --- circular economy --- polyurethane foam --- thermal property --- phase change material --- flame retardant --- perforated plates with extended tubes --- porous materials --- periodic absorber --- wood plastic composite --- transmission loss --- radiation efficiency --- orthotropic panel --- wavenumber analysis --- molecular sieve pellets --- impedance tube --- sound transmission loss --- semi-active damping --- sandwich panel --- morphing structure --- compressible constrained layer damping --- composite materials --- anisotropic materials --- optimized absorption --- diffuse field --- graded properties --- agro-waste --- hygrothermal performances --- concrete --- noise --- acoustic properties --- sound-absorbing --- sound-reflecting --- n/a