ABSTRACT Epoxy composites were prepared with different contents of hydrophobic silica aerogel particles to investigate their mechanical, thermal, and properties. The composites, particularly the one containing 1 wt % aerogel, showed remarkable toughness yielding behaviors compared neat epoxy, its brittle behavior. As content increased, thermal properties (e.g., conductivity stability) improved. This was due very low high stability particles. Moreover, use led development To examine...

ABSTRACT In this investigation, silica aerogel (SA)/Rigid Polyurethane (PUR) foam composites and aerogel/Polyurethane (PU) were prepared by dry mixing of granular grinded aerogels with polyol part. They then combined diisocyanate Three different types PUR foams an elastomeric coating grade PU studied as well. Results show that thermal conductivity did not decrease adding aerogel. It even increased for some grades which is assumed to be due the change in cell configuration these foams. was...

The photodegradation efficiency of cellulose-X/zinc oxide-Y (CA-X/ZnO-Y) aerogels was studied to degrade methyl orange (MO) as an organic dye pollutant from aqueous solution under UV light irradiation. In this study, the initial pH (3, 7, and 11), photocatalyst dosage 6, 9 g L-1), concentration MO (10, 20, 30 ppm), cellulose in CA-X/ZnO-Y hybrid aerogel wt%) were selected four variable parameters, whereas photoderadation performance response. Moreover, response surface methodology (RSM)...

In this study, mechanical properties of glass fiber–reinforced sulfur mortar prepared with dicyclopentadiene (DCPD)-modified are evaluated. The efficiency modification was detected using a differential scanning calorimeter and mortar's property measurements. Fiber-reinforced mortars were DCPD-modified fibers lengths 6 12 mm different volume percentages. Splitting tensile strength modulus rupture (MOR) increased up to 147.44% 83%, respectively, due fiber reinforcement; however, compressive...

Polypropylene (PP)/silica aerogel (SA) composites were prepared and their thermal flammability properties studied. The PP/SA with different weight percent via melt compounding method using an internal mixer. Their morphology, conductivity, stability combustion behavior characterized. SEM images confirmed the homogenous mixing of components. measurement conductivities samples indicated that PP would be a better barrier in presence SA. gravimetric analysis results showed combining silica...

ABSTRACT Rigid polyurethane foams (RPUF) with nanoporous graphene (NPG) were synthesized and their properties, including density, mechanical, morphological, thermal‐resistant properties studied. In the current work, polyols of RPUF formulation NPG content was varied from 0.1 to 0.5 wt %. Scanning electron microscopy (SEM) observation used observe dispersion cell size in nanocomposites. Only 0.25 % improved compressive strength modulus respectively by 10.7% 66.5%. The TGA analysis confirmed...

ABSTRACT The properties of silica‐aerogel/UPVC composites have been investigated with emphasis on sound and heat insulation. UPVC is a material construction for window profiles drainage pipes. Hydrophobic silica aerogels were synthesized using silicate sodium as precursor through two‐step sol–gel process. physical textural the such density, surface area, particle size analyzed SEM BET analysis. Then, mixed Unplastisized Polyvinyl Chloride (UPVC) compound at five different weight ratios in an...

Resorcinol–formaldehyde (RF) aerogels modified with amine groups were used to remove heavy metal ions from aqueous solutions. RF aerogel was synthetized under subcritical conditions and then by 3-aminopropyl trimethoxysilane. The ability of Pb(II), Hg(II), Cd(II) solution investigated using batch-adsorption technique respect the changes in pH, contact time, sorbent concentration, initial temperature. maximum adsorption capacity Cd(II), found happen at pH 6, 5, respectively, after about one...

In the research reported in this paper, silica aerogel was synthesized a cotton nonwoven mat (CNM) and then composite used as sound absorber. The experimental data indicated that using coating on CNM significantly improved absorption up to 2,500 Hz. However for higher frequencies reduced compared neat CNM. best performance of coated happened between 250 effects different processing conditions were studied final properties consequently pore size surface area had no direct influence...

ABSTRACT In this study, two different types of acrylic resins were synthesized through emulsion polymerization. The first category contained methyl methacrylate, 2‐ethylhexyl acrylate, and acid monomers. second composition had an additional monomer named acrylamide (AAm). kinetic behavior polymerization reaction was investigated. results showed that the presence AAm increased conversion (>90% in 10 min) rate Furthermore, latexes characterized by Dynamic Light Scattering (DLS) Fourier...

ABSTRACT In the present study, epoxy samples containing nanoporous graphene (NPG) were synthesized and analyzed in terms of mechanical, morphological, thermal, adhesion, anticorrosion properties. To this end, employed curing agents (hardeners) NPG content was varied from 0 to 1 wt %. By using a hardener with aliphatic side chains, toughness nanocomposite improved without decrease modulus. Adding % increased modulus by about 30%. The dynamic mechanical results showed an increment glass...

In this study, glass fiber silica aerogel composites were fabricated and used to protect steel frames against fire. Glass-fiber-coated was synthesized by immersing fibers into sol. Following gel formation, surface modifications carried out. Samples dried carefully at relatively high temperatures ambient pressure. The samples then prepared two different solution pH values four aging times. Brunauer-Emmett-Teller (BET) Barrett-Joyner-Halenda (BJH) techniques have been employed find the...

Abstract In the present research, thermal stability and fire properties of polypropylene (PP) have been improved through direct melt intercalation PP, organically modified montmorillonite (OMMT), calcium carbonate (CaCO 3 ) nanoparticles, conventional flame retardants, i.e., decabromodiphenyl oxide (DB) antimony trioxide (AO). The morphology compound was characterized by means X‐ray diffractometry transmission electron microscopy. Thermogravimetry analysis (TGA), cone‐calorimetry, limiting...

Nanostructured carbons have opened up new perspectives in fields of electromagnetic (EM) applications. The present study aims at the processing microwave absorbing (MA) materials based on carbon aerogels (CAs) polymethyl methacrylate (PMMA) matrix to be used X-band frequency. CAs were synthesized by carbonization a sol-gel derived organic gel from resorcinol and formaldehyde as starting materials. Microwave attenuation properties prepared composites investigated terms particle size...

In this study, sunlight absorbing membranes consisting of ultra-black resorcinol-formaldehyde (RF)-based carbon aerogel (CA) and hydrophilic graphene oxide (GO) suspension were fabricated. To investigate the effect substrate structure, CA/GO ink was cast onto two different layers including 3D modified copper foam (MCF) 2D paper sheet. The (CF) treated with a new simple modification method to enhance hydrophilicity. Finally, solar steam generation performances prepared evaluated. optical...