Influence of different treatments on characteristics of nanooxide powders alone or with adsorbed polar polymers or proteins

Thermal and dielectric studies of PEG/C/AST nanocomposites

“…The changes described above and affected by the addition of nanoparticles can be affected by porous AC microparticles (despite C AC = 10 wt % only with respect to solids content) because PEG‐35/A‐300 and PEG‐35/AST composites demonstrated distinct concentration dependences34 different from those of PEG/C/AST observed here. This is due to the differences in the porosity (pore size distribution, PSD), specific surface area, and surface structures of AC and nanooxides 33–39. The confined space effects are stronger for PEG interacting with AC (composed of nano/meso/macroporous particles) than nanooxides (nonporous nanoparticles).…”

“…Higher mobility of PEG‐4 molecules results in a larger fraction of immobilized amorphous polymer than that for PEG‐35 [Figure 3(g)]. The PEG monolayer coverage corresponds to C pol = 15–20 wt % for nanooxides 15, 33. Therefore, a fraction of immobilized macromolecules is close to 100% at C pol ≤ 20 wt % [Figure 3(f)].…”

“…The suspensions were dried for 5–10 days depending on the amount of water. The PEG amount at C PEG = 20 wt % is enough to form a monolayer coverage (according to FTIR, TG, and TPD mass‐spectrometry data33–37) of oxide and AC nanoparticles. Thus, the systems can be separated into two classes, namely with C PEG ≤ 40 wt % and C PEG ≥ 60 wt %, which can be considered as PEG adsorbed on silica and AC particles and PEG filled by oxide/AC filler, respectively.…”

“…In these materials, the PEG‐graphene layers are important for accommodating volume expansion of the coated sulfur particles during discharge, trapping soluble polysulfide intermediates, and rendering the sulfur particles electrically conducting. Notice that a PEG interfacial layer can be less dense than poly(vinyl alcohol), PVA, because the latter can form strong hydrogen PVA–PVA bonds 30–33. Previous comparative investigations of PEG‐Al 2 O 3 /SiO 2 /TiO 2 and A‐300‐PEG composites showed34 that local interactions between polymer and AST are stronger than that of polymer–polymer.…”

Polymer Adsorbents vs. Functionalized Oxides and Carbons: Particulate Morphology and Textural and SurfaceCharacteristics

“…Therefore, a set of methods could be used in parallel, such as direct (TEM, SEM) and indirect (probe adsorption, SAXS, NMR cryoporometry, DSC thermoporometry, etc.) methods [ 9 , 28 , 31 , 54 , 55 , 56 , 64 , 65 , 66 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 111 , 114 , 115 , 116 , 117 , 118 , 119 , 120 , 121 , 122 , 123 , 124 , 125 , 126 , 127 , 128 , 129 , 130 ]. More accurate results can be obtained if several methods are used in parallel (e.g., SAXS and adsorption).…”