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In this new book, we present a collection of the advanced developments in reconfigurable antennas and metasurfaces. It begins with a review of reconfigurability technologies, and proceeds to the presentation of a series of reconfigurable antennas, UWB MIMO antennas and reconfigurable arrays. Then, reconfigurable metasurfaces are introduced and the latest advances are presented and discussed.

reconfigurable antenna --- smartphone --- slot antenna --- sub-6G --- band rejected --- envelope correlation co-efficient --- four element MIMO --- polarization diversity --- ultra-wideband multiple input multiple output --- antenna array --- aperiodic array --- full wave analysis --- particle swarm optimization --- reconfigurable antenna arrays --- solid state switches --- RF switching --- magnetic particles --- magnetostatic responsive structures (MRSs) --- wideband reconfigurable antennas --- new feeding techniques --- dual polarization --- multifrequency antennas --- supershape --- reconfigurable antennas --- surface wave array antenna --- metasurface ground plane --- low-profile --- square-ring antennas --- van Atta reflector --- RCS reduction --- structural mode scattering --- metasurfaces --- polarization reconfigurability --- leaky waves --- combo-reconfigurable --- frequency and radiation pattern --- 5G --- millimeter waves --- mobile communication --- flexible antennas --- frequency reconfigurable --- microfluidic antennas --- pattern reconfigurable --- polarization reconfigurable --- wearable antennas --- active FSS --- C-band --- frequency-selective surface (FSS) --- spatial filters --- switchable --- X-band --- smart devices --- antenna boosters --- multiband antennas --- small antennas --- wireless devices --- matching networks --- digitally tunable capacitors --- n/a

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In this new book, we present a collection of the advanced developments in reconfigurable antennas and metasurfaces. It begins with a review of reconfigurability technologies, and proceeds to the presentation of a series of reconfigurable antennas, UWB MIMO antennas and reconfigurable arrays. Then, reconfigurable metasurfaces are introduced and the latest advances are presented and discussed.

Technology: general issues --- History of engineering & technology --- Energy industries & utilities --- reconfigurable antenna --- smartphone --- slot antenna --- sub-6G --- band rejected --- envelope correlation co-efficient --- four element MIMO --- polarization diversity --- ultra-wideband multiple input multiple output --- antenna array --- aperiodic array --- full wave analysis --- particle swarm optimization --- reconfigurable antenna arrays --- solid state switches --- RF switching --- magnetic particles --- magnetostatic responsive structures (MRSs) --- wideband reconfigurable antennas --- new feeding techniques --- dual polarization --- multifrequency antennas --- supershape --- reconfigurable antennas --- surface wave array antenna --- metasurface ground plane --- low-profile --- square-ring antennas --- van Atta reflector --- RCS reduction --- structural mode scattering --- metasurfaces --- polarization reconfigurability --- leaky waves --- combo-reconfigurable --- frequency and radiation pattern --- 5G --- millimeter waves --- mobile communication --- flexible antennas --- frequency reconfigurable --- microfluidic antennas --- pattern reconfigurable --- polarization reconfigurable --- wearable antennas --- active FSS --- C-band --- frequency-selective surface (FSS) --- spatial filters --- switchable --- X-band --- smart devices --- antenna boosters --- multiband antennas --- small antennas --- wireless devices --- matching networks --- digitally tunable capacitors --- reconfigurable antenna --- smartphone --- slot antenna --- sub-6G --- band rejected --- envelope correlation co-efficient --- four element MIMO --- polarization diversity --- ultra-wideband multiple input multiple output --- antenna array --- aperiodic array --- full wave analysis --- particle swarm optimization --- reconfigurable antenna arrays --- solid state switches --- RF switching --- magnetic particles --- magnetostatic responsive structures (MRSs) --- wideband reconfigurable antennas --- new feeding techniques --- dual polarization --- multifrequency antennas --- supershape --- reconfigurable antennas --- surface wave array antenna --- metasurface ground plane --- low-profile --- square-ring antennas --- van Atta reflector --- RCS reduction --- structural mode scattering --- metasurfaces --- polarization reconfigurability --- leaky waves --- combo-reconfigurable --- frequency and radiation pattern --- 5G --- millimeter waves --- mobile communication --- flexible antennas --- frequency reconfigurable --- microfluidic antennas --- pattern reconfigurable --- polarization reconfigurable --- wearable antennas --- active FSS --- C-band --- frequency-selective surface (FSS) --- spatial filters --- switchable --- X-band --- smart devices --- antenna boosters --- multiband antennas --- small antennas --- wireless devices --- matching networks --- digitally tunable capacitors

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This Special Issue is one of the first for the new MDPI flagship journal Chemistry (ISSN 2624-8549) which has a broad remit for publishing original research in all areas of chemistry. The theme of this issue is Supramolecular Chemistry in the 3rd Millennium and I am sure that this topic will attract many exciting contributions. We chose this topic because it encompasses the unity of contemporary pluridisciplinary science, in which organic, inorganic, physical and theoretical chemists work together with molecular biologists and physicists to develop a systems-level understanding of molecular interactions. The description of supramolecular chemistry as ‘chemistry beyond the molecule’ (Jean-Marie Lehn, Nobel Lecture and Gautam R. Desiraju, Nature, 2001, 412, 397) addresses the wide variety of weak, non-covalent interactions that are the basis for the assembly of supramolecular architectures, molecular receptors and molecular recognition, programed molecular systems, dynamic combinatorial libraries, coordination networks and functional supramolecular materials. We welcome submissions from all disciplines involved in this exciting and evolving area of science.

Technology: general issues --- anion binding --- chloride receptor --- switchable system --- hydroquinone --- redox switch --- metal-organic frameworks --- vapour sorption --- solvatochromism --- desorption kinetics --- ion-channels --- crown-ethers --- bilayer membranes --- self-assembly --- supramolecular chemistry --- host–guest chemistry --- coordination cage --- catalysis --- crystal structure --- copper chloride complexes --- H-bonding pattern --- tetrazole ligands --- X-ray diffraction --- Hirshfeld surfaces --- uranium(VI) --- carboxylates --- capsules --- structure --- luminescence --- multicomponent cocrystal --- cocrystallization mechanism --- cocrystal synthesis --- crystal engineering --- porous material --- molecular recognition --- halogen bond --- co-crystal --- molecular tecton --- binary solid --- network structure --- σ-hole --- molecular electrostatic potential --- calixarenes --- coordination clusters --- manganese --- molecular magnetism --- host–guest interaction --- cucurbit[7]uril --- 4-pyrrolidinopyridinium --- copper complexes --- chlorido ligand displacement --- catalysis regulation --- Schiff base ligands --- urea hydrolysis --- coordination chemistry --- hydrogen bonds --- metalla-assemblies --- coordination-driven self-assembly --- orthogonality --- ligands --- metal ions --- complementarity --- hydrogen bonding --- cyclotricatechylene --- metal–organic cage --- helicate --- metallosupramolecular --- chirality --- copper(II) complexes --- pyrazolato ligands --- supramolecular assembly --- X-ray crystallography --- magnetic susceptibility --- EPR spectroscopy --- isotropic exchange --- antisymmetric exchange --- dipolar interaction --- DFT calculations --- hydrogen bond --- pyrazine --- chloropyrazine --- chloropyrazin-2-amine --- copper halide --- supramolecular structure --- conformational polymorphism --- intermolecular contacts --- N,N′,N″,N‴-Tetraisopropylpyrophosphoramide --- pyrophosphoramide --- synthons --- supramolecular motifs --- n/a --- host-guest chemistry --- host-guest interaction --- metal-organic cage --- N,N',N",N‴-Tetraisopropylpyrophosphoramide

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This Special Issue is one of the first for the new MDPI flagship journal Chemistry (ISSN 2624-8549) which has a broad remit for publishing original research in all areas of chemistry. The theme of this issue is Supramolecular Chemistry in the 3rd Millennium and I am sure that this topic will attract many exciting contributions. We chose this topic because it encompasses the unity of contemporary pluridisciplinary science, in which organic, inorganic, physical and theoretical chemists work together with molecular biologists and physicists to develop a systems-level understanding of molecular interactions. The description of supramolecular chemistry as ‘chemistry beyond the molecule’ (Jean-Marie Lehn, Nobel Lecture and Gautam R. Desiraju, Nature, 2001, 412, 397) addresses the wide variety of weak, non-covalent interactions that are the basis for the assembly of supramolecular architectures, molecular receptors and molecular recognition, programed molecular systems, dynamic combinatorial libraries, coordination networks and functional supramolecular materials. We welcome submissions from all disciplines involved in this exciting and evolving area of science.

anion binding --- chloride receptor --- switchable system --- hydroquinone --- redox switch --- metal-organic frameworks --- vapour sorption --- solvatochromism --- desorption kinetics --- ion-channels --- crown-ethers --- bilayer membranes --- self-assembly --- supramolecular chemistry --- host–guest chemistry --- coordination cage --- catalysis --- crystal structure --- copper chloride complexes --- H-bonding pattern --- tetrazole ligands --- X-ray diffraction --- Hirshfeld surfaces --- uranium(VI) --- carboxylates --- capsules --- structure --- luminescence --- multicomponent cocrystal --- cocrystallization mechanism --- cocrystal synthesis --- crystal engineering --- porous material --- molecular recognition --- halogen bond --- co-crystal --- molecular tecton --- binary solid --- network structure --- σ-hole --- molecular electrostatic potential --- calixarenes --- coordination clusters --- manganese --- molecular magnetism --- host–guest interaction --- cucurbit[7]uril --- 4-pyrrolidinopyridinium --- copper complexes --- chlorido ligand displacement --- catalysis regulation --- Schiff base ligands --- urea hydrolysis --- coordination chemistry --- hydrogen bonds --- metalla-assemblies --- coordination-driven self-assembly --- orthogonality --- ligands --- metal ions --- complementarity --- hydrogen bonding --- cyclotricatechylene --- metal–organic cage --- helicate --- metallosupramolecular --- chirality --- copper(II) complexes --- pyrazolato ligands --- supramolecular assembly --- X-ray crystallography --- magnetic susceptibility --- EPR spectroscopy --- isotropic exchange --- antisymmetric exchange --- dipolar interaction --- DFT calculations --- hydrogen bond --- pyrazine --- chloropyrazine --- chloropyrazin-2-amine --- copper halide --- supramolecular structure --- conformational polymorphism --- intermolecular contacts --- N,N′,N″,N‴-Tetraisopropylpyrophosphoramide --- pyrophosphoramide --- synthons --- supramolecular motifs --- n/a --- host-guest chemistry --- host-guest interaction --- metal-organic cage --- N,N',N",N‴-Tetraisopropylpyrophosphoramide

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Electrochemical surface science (EC-SS) is the natural advancement of traditional surface science (where gas–vacuum/solid interfaces are studied) to liquid (solution)/electrified solid interfaces. Such a merging between two different disciplines—i.e., surface science (SS) and electrochemistry—officially advanced ca. three decades ago. The main characteristic of EC-SS versus electrochemistry is the reductionist approach undertaken, inherited from SS and aiming to understand the microscopic processes occurring at electrodes on the atomic level. A few of the exemplary keystone tools of EC-SS include EC-scanning probe microscopies, operando and in situ spectroscopies and electron microscopies, and differential EC mass spectrometry (DEMS). EC-SS indirectly (and often unconsciously) receives a great boost from the requirement for rational design of energy conversion and storage devices for the next generation of energetic landscapes. As a matter of fact, the number of material science groups deeply involved in such a challenging field has tremendously expanded and, within such a panorama, EC and SS investigations are intimately combined in a huge number of papers. The aim of this Special Issue is to offer an open access forum where researchers in the field of electrochemistry, surface science, and materials science could outline the great advances that can be reached by exploiting EC-SS approaches. Papers addressing both the basic science and more applied issues in the field of EC-SS and energy conversion and storage materials have been published in this Special Issue.

Pd thin films --- n/a --- Auger-Electron Spectroscopy --- benchmarking --- potential-dependent structures --- CO electro-oxidation --- surface reconstruction --- photo-electrochemistry --- nitrogen doping --- potential stepping --- DFT --- nanoparticles --- carbon nanofiber --- Pd --- gas diffusion electrode --- flexible ITO --- UPS --- palladium --- Lead OPD --- formic acid oxidation --- cobalt oxide --- adsorbed OH --- electrochemistry --- Pt --- mesopore --- DMFC --- pH and concentration effects --- solvothermal method --- direct methanol fuel cells --- EF-PEEM --- PVDF --- self-assembly --- PEMFC --- hard X rays --- photochemistry --- EQCM --- potential cycling --- surface alloy --- near ambient pressure XPS --- cobalt-based electrocatalyst --- silver single crystals --- Cu(111) --- electrodeposited alloys --- Pt single-crystal electrodes --- SOFC --- TiO2 --- oxygen evolution reaction --- silicon nanoparticles --- pump &amp --- graphitization --- in situ EC-STM --- oxygen reduction --- gold --- diazonium salts --- Au --- micropore --- solid/liquid interface --- XPS --- XAFS --- surface chemistry --- electrosynthesis --- porous fiber --- surface science --- click chemistry --- adhesion --- in situ --- methanol oxidation reaction --- hydroxyl radical --- mass transport --- free electron laser --- cyclic voltammetry --- redox properties --- electro-oxidation --- X-ray absorption spectroscopy --- hydrogen adsorption --- electrodeposition --- electrocatalysis --- Ordered mesoporous carbon --- Corrosion Protection --- electrochemical interface --- cyclic voltammetry (CV) --- FEXRAV --- photoelectron simulations --- Pt–Ru catalysts --- d-band theory --- bimetallic alloy --- photoconversion --- ordered mesoporous carbons --- carbon nanofibers (CNFs) --- platinum --- water splitting --- Surface Modification --- EPR spectroscopy --- scanning photoelectron microscopy --- model catalyst --- energy dispersive --- porphyrins --- combined non-covalent control --- AES --- spin-coating --- SAMs --- water oxidation --- in-situ X-ray diffraction --- Au nanocrystals --- model systems --- platinum single crystals --- cathode --- redox monolayers --- surface nanostructures --- bifunctional oxygen electrode --- polymer --- photoelectrochemistry --- metal-electrolyte interface --- electrocatalysts --- APTES --- porogen --- electrophoretic deposition --- thin-films --- ammonia activation --- graphene --- ORR --- polypyrrole --- iridium --- surface area --- reduced graphene oxide --- Magnetite --- Platinum --- electrospinning --- catalysts --- Blackening of Steel --- switchable surfaces --- in situ ambient pressure XPS --- fuel cells --- methanol oxidation --- quick-XAS --- nickel --- CO oxidation --- solid oxide fuel cells --- operando --- probe --- CdS --- alkanthiols --- ECALE --- alkoxyamine surfaces --- underpotential deposition (upd) --- Pt-Ru catalysts