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This book, a collection of 12 original contributions and 4 reviews, provides a selection of the most recent advances in the preparation, characterization, and applications of polymeric nanocomposites comprising nanoparticles. The concept of nanoparticle-reinforced polymers came about three decades ago, following the outstanding discovery of fullerenes and carbon nanotubes. One of the main ideas behind this approach is to improve the matrix mechanical performance. The nanoparticles exhibit higher specific surface area, surface energy, and density compared to microparticles and, hence, lower nanofiller concentrations are needed to attain properties comparable to, or even better than, those obtained by conventional microfiller loadings, which facilitates processing and minimizes the increase in composite weight. The addition of nanoparticles into different polymer matrices opens up an important research area in the field of composite materials. Moreover, many different types of inorganic nanoparticles, such as quantum dots, metal oxides, and ceramic and metallic nanoparticles, have been incorporated into polymers for their application in a wide range of fields, ranging from medicine to photovoltaics, packaging, and structural applications.

ceramizable silicone rubber --- halloysite --- encapsulant --- drug delivery --- fillers --- ultraviolet (UV) curable coatings --- PDMS etching --- nanoparticles --- roughness --- methacryl POSS --- composite --- chlorogenic acid --- hydrophilic --- surface free energy --- theranostics --- 29Si-NMR --- borate --- dental resin --- morphology --- surface --- fabrication --- polydimethylsiloxane --- recessed electrode --- swelling --- MAPOSS --- X-ray (Micro-CT) microtomography --- mechanical properties --- plateau-shaped electrode --- hybrid hydrogel --- hardness --- sugar templating process --- bioactivity --- amphiphilic --- high molecular weight --- low surface energy materials --- PDMS --- quartz microcrystal --- 3D porous network --- fluorinated siloxane resin --- mortar --- surface modification --- poly(dimethylsiloxanes) --- scratch resistance --- multielectrode array (MEA) --- non-releasable --- sol-gel --- topology of polysiloxane chains --- cross-linking --- FTIR --- diethyl carbonate --- poly(ethylene glycol) (PEG) --- TG-FTIR --- organosilane --- anti-bioadhesion --- carbon content --- nanomedicine --- thermal stability --- hybrids --- underexposure --- nanosilica --- hyperbranched poly(methylhydrosiloxanes) --- spinal cord signal recording --- ceramizable mechanism --- coatings --- TG --- silicon --- polysiloxanes --- basalt fibre --- refractive index --- drug release --- thermal conductivity --- hydrolytic polycondensation --- shrinkage --- polyhedral oligomeric silsesquioxanes

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The need for energy is increasing and but the production from conventional reservoirs is declining quickly. This requires an economically and technically feasible source of energy for the coming years. Among some alternative future energy solutions, the most reasonable source is from unconventional reservoirs. As the name “unconventional” implies, different and challenging approaches are required to characterize and develop these resources. This Special Issue covers some of the technical challenges for developing unconventional energy sources from shale gas/oil, tight gas sand, and coalbed methane.

horizontal well --- shale gas --- shock loads --- pseudo-steady-state non-equilibrium sorption --- unsteady state non-equilibrium sorption --- porosity–permeability --- fractured-vuggy reservoirs --- flow channel --- pressure derivative --- total organic carbon (TOC) --- CO2 huff-n-puff --- flow behavior --- unconventional reservoirs --- semi-analytical model --- gravel pack --- optimization measures --- fractures --- lab tests under reservoir condition --- dual-porosity system --- unconventional --- gravity differentiation --- MICP --- perforation safety --- fracture penetration extent --- organic-rich shale --- stress-dependent permeability --- equilibrium sorption --- helium porosimetry --- numerical model --- original gas in-place --- shale alteration --- injection and production pattern --- adsorption and desorption isotherms --- low-pressure gas adsorption --- initial water saturation --- drilling fluid --- sorption hysteresis --- coalbed methane --- gas content --- capillary number --- reorientation fractures --- water flooding effect --- organic pores --- tight reservoir --- condensate recovery --- Langmuir pressure --- Klinkenberg slippage theory --- limestone and calcareous mudstone interbedding --- petrophysics --- tight gas sand --- numerical analysis --- northern Guizhou --- wettability --- peak pressure --- sand control --- water imbibition --- clay bound water --- carbon dioxide sequestration --- adsorption capacity --- gas compressibility factors --- convolutional neural network --- multi-stage fracturing horizontal wells --- fractured tight reservoir --- physical model --- tight gas reservoirs --- automatic classification --- NMR --- catalytic oxidation characteristics --- micro-CT image --- wellbore stability --- gas adsorption and desorption --- gas shale --- medium volatile bituminous coal --- hydraulic flow units --- GEM® --- petrophysical properties --- compositional 3D --- rock-water-CO2 interaction --- source-mixed gas --- residual gas distribution --- oxidation reaction pathway --- coal rank --- oil migration --- clay content --- perforated string --- TOC recovery --- Computer Modelling Group (CMG) --- capillary trapping --- pore size distribution --- adsorption --- tight reservoirs --- well interference --- gradation optimization --- shale gas condensate reservoir --- Niutitang formation --- pulse decay test --- well testing --- Langmuir model --- methane adsorption capacity --- pore structure --- and tight sand gas) --- ultra-deep well --- deepwater well --- orthogonal test --- high pressure and low flowrate --- theoretical model --- safety analysis --- transient pressure --- catalyst-activated low temperature oxidation --- reservoir simulation --- Langmuir volume --- air flooding --- petrography --- total organic carbon --- electrical resistivity --- diffusion coefficient --- equation of state --- porosity --- zeta potential --- gas permeability measurement --- co-exploitation --- nuclear magnetic resonance --- Changqing tight oil --- visual experiment --- tight oil reservoirs --- caprock integrity --- coal measure gases (coalbed gas --- NIST-Refprop

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The fluid flow in fracture porous media plays a significant role in the assessment of deep underground reservoirs, such as through CO2 sequestration, enhanced oil recovery, and geothermal energy development. Many methods have been employed—from laboratory experimentation to theoretical analysis and numerical simulations—and allowed for many useful conclusions. This Special Issue aims to report on the current advances related to this topic. This collection of 58 papers represents a wide variety of topics, including on granite permeability investigation, grouting, coal mining, roadway, and concrete, to name but a few. We sincerely hope that the papers published in this Special Issue will be an invaluable resource for our readers.

deformation feature --- minerals --- microstructure --- mixing --- permeability --- gas concentration --- water–rock interaction --- loose gangue backfill material --- unified pipe-network method --- fracture --- roof-cutting resistance --- crack --- similar-material --- movable fluid --- gob-side entry retaining (GER) --- rock-soil mechanics --- bed separation --- orthogonal tests --- charge separation --- water soaked height --- fluid flow in reclaimed soil --- laboratory experiment --- longwall mining --- grading broken gangue --- MIP --- elastic modulus --- effective stress --- permeability coefficient --- mixer --- naturally fracture --- SEM --- microstructure characteristics --- artificial joint rock --- fractured rock --- strata movement --- conservative solute --- particle velocity --- dry-wet cycles --- hydraulic fractures --- numerical calculation --- mechanical behaviors --- normalized conductivity-influence function --- fractured porous rock mass --- PPCZ --- segmented grouting --- non-aqueous phase liquid --- intelligent torque rheometer --- numerical analysis --- temperature --- unsaturated soil --- uniaxial compressive strength --- mine shaft --- coalbed methane (CBM) --- nonlinear flow in fractured porous media --- similar simulation --- forecasting --- tight sandstones --- oriented perforation --- hydro-mechanical coupling --- constant normal stiffness conditions --- cohesive soils --- layered progressive grouting --- chemical grouts --- grain size of sand --- Darcy’s law --- soft coal masses --- hydro-power --- cyclic heating and cooling --- cohesive element method --- cement-based paste discharge --- tectonically deformed coal --- split grouting --- fault water inrush --- filtration effects --- T-stress --- particle flow modeling --- new cementitious material --- strength --- stabilization --- fractured porous medium --- brine concentration --- initial water contained in sand --- XRD --- fracture criteria --- hydraulic conductivity --- roadway deformation --- backfill mining --- adsorption/desorption properties --- pore pressure --- roughness --- cement–silicate grout --- compressive stress --- discrete element method --- dynamic characteristics --- strain-based percolation model --- thermal-hydrological-chemical interactions --- pore distribution characteristics --- transversely isotropic rocks --- nitric acid modification --- disaster-causing mechanism --- CH4 seepage --- crack distribution characteristics --- micro-CT --- relief excavation --- Darcy flow --- hydraulic fracturing --- mixed-form formulation --- propagation --- scanning electron microscope (SEM) images --- propagation pattern --- consolidation process --- rheological deformation --- gas adsorption --- soft filling medium --- ground pressure --- orthogonal ratio test --- rock fracture --- coal seams --- high-steep slope --- interface --- orthogonal test --- stress interference --- physical and mechanical parameters --- fracture propagation --- fluid–solid coupling theory --- coupling model --- surface characteristics --- numerical manifold method --- gas --- lignite --- water inrush prevention --- coupled THM model --- hard and thick magmatic rocks --- Ordos Basin --- porosity --- damage mechanics --- seepage --- degradation mechanism --- high temperature --- visualization system --- bentonite-sand mixtures --- contamination --- conductivity-influence function --- water-rock interaction --- deterioration --- seepage pressure --- glutenite --- adhesion efficiency --- mechanical behavior transition --- bedding plane orientation --- n/a --- enhanced gas recovery --- debris-resisting barriers --- reinforcement mechanism --- on-site monitoring --- geophysical prospecting --- cyclic wetting-drying --- scoops3D --- semi-analytical solution --- enhanced permeability --- management period --- seepage control --- deformation --- Yellow River Embankment --- impeded drainage boundary --- rheological test --- circular closed reservoir --- grout penetration --- viscoelastic fluid --- coal-like material --- paste-like slurry --- floor failure depth --- supercritical CO2 --- gravel --- numerical model --- fractal --- gas-bearing coal --- shear-flow coupled test --- rheological limit strain --- CO2 flooding --- flotation --- goaf --- slope stability --- damage --- coal and gas outburst --- hydraulic fracture --- anisotropy --- high-order --- effluents --- FLAC --- limestone roof --- sandstone --- TG/DTG --- Xinjiang --- two-phase flow --- model experiment --- coal particle --- volumetric strain --- failure mode --- land reclamation --- sandstone and mudstone particles --- contiguous seams --- CO2 geological storage --- numerical simulation --- geogrid --- stress relief --- optimum proportioning --- roadside backfill body (RBB) --- pervious concrete --- mudstone --- hydraulic fracture network --- grouted sand --- fractal pore characteristics --- refraction law --- segmented rheological model --- ductile failure --- heterogeneity --- flow law --- fracture closure --- coal measures sandstone --- tight sandstone gas reservoirs --- gob behaviors --- water-dripping roadway --- creep characteristics --- internal erosion --- warning levels of fault water inrush --- hydraulic aperture --- bolt support --- discontinuous natural fracture --- microscopic morphology --- critical hydraulic gradient --- mixed mode fracture resistance --- differential settlement --- alternate strata --- finite element method --- crushing ratio --- chloride --- glauberite cavern for storing oil &amp --- macroscopic mechanical behaviors --- collision angle --- adsorption performance --- failure mechanism --- mechanical properties --- transmissivity --- damage evolution --- gas fracturing --- multitude parameters --- deviatoric stress --- Jiaohe --- coal --- soil properties --- acoustic emission --- pore structure --- grouting experiment --- concrete --- confining pressures --- green mining --- gas drainage --- fluid viscosity --- compression deformation --- Unsaturation --- adsorption–desorption --- seepage-creep --- constitutive model --- soil particle size --- Pseudo Steady-State (PPS) constant --- soil–structure interface --- debris flow --- fracture grouting --- initial settlement position --- regression equation --- electrical potential --- secondary fracture --- surrounding rock --- solid backfill coal mining --- time variation --- excess pore-pressures --- finite-conductivity fracture --- permeability characteristics --- rainfall-unstable soil coupling mechanism(R-USCM) --- shaft lining --- Darcy's law --- cement-silicate grout --- fluid-solid coupling theory --- adsorption-desorption --- soil-structure interface