Effect of polyvinyl alcohol adsorption on the mixed alumina–silica–titania suspension stability

Wiśniewska, Małgorzata; Szewczuk-Karpisz, Katarzyna; Ostolska, Iwona; Urban, Teresa; Terpiłowski, Konrad; Zarko, V.I.; Gun’ko, Vladimir M.

doi:10.1016/j.jiec.2014.08.027

Cited by 23 publications

(5 citation statements)

References 21 publications

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“…In the present experiment, PVA was used as a matrix owing to its good processability to form free-standing film, originating from its outstanding dispersibility in aqueous solution, flexibility, adhesion and oxygen barrier property. [31][32][33][34][35][36][37][38][39][40][41][42][43] As a result, PVA dispersed in solution was well infiltrated into the 3D hollow graphene structure via a dip-coating process, and free-standing graphene/PVA films of ca. 4.3 µm thickness were fabricated after drying at 70 °C.…”

Section: Resultsmentioning

confidence: 99%

Flexible free-standing composite films having 3D continuous structures of hollow graphene ellipsoids

et al. 2015

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Graphene composites have great potential in electrical and electronic applications due to their outstanding physicochemical, electrical, and mechanical properties. Unfortunately, current graphene preparation technologies allow the exploitation of only an exceptionally low percentage of graphene's capability. Herein, free-standing graphene films based on three-dimensional (3D) continuous structures of hollow graphene ellipsoids were successfully fabricated, whose composite structure has never been investigated. Positively charged polystyrene (PS) spheres were first wrapped with negatively charged graphene upon simple mixing, and became ellipsoids by stretching. Due to their improved continuity, composites based on the ellipsoids and spherical microparticles have lower sheet resistances than those based on spherical nanoparticles. Upon folding and application of pressure, composites based on the hollow graphene ellipsoids exhibited superior electrical conductivity and structural stability owing to their high mechanical strength and effective electron transport pathway. The ability to control the face-contact structures of graphene in a polymer matrix by means of particle morphology represents an effective strategy for future composite engineering.

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Section: Resultsmentioning

confidence: 99%

Flexible free-standing composite films having 3D continuous structures of hollow graphene ellipsoids

et al. 2015

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“…Negative surface charge density can be generated by deprotonation of carboxylic groups (COOH → COO -) while positive charge density can result from the protonation of amine groups (NH2 → NH3 + ) [48]. Negative charge densities can also be generated from PVA because, in addition to the hydroxyl groups (-OH), the PVA macromolecules contain a small number of acetate groups (-O-COCH3) [49]. These groups could remain in the polymer chains as a result of incomplete alcoholysis giving carboxyl C(=O)OH and carbonyl C=O groups [50].…”

Section: Xps Analysismentioning

confidence: 99%

Morphological, chemical and electrical characterization of a family of commercial nanofiltration polyvinyl alcohol coated polypiperazineamide membranes

Otero-Fernández

Diaz

Otero

et al. 2020

European Polymer Journal

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Three AFC membranes from PCI, of the thin film composite (TFC) nanofiltration type, have been characterized by using XPS, AFM, Contact angles, Zeta potential and permeation experiments. This plethora of complimentary methods portrays a deep and exhaustive description of these membranes.Morphological properties, including porosity, water permeability, fractal dimension, Wenzel parameter and roughness, correlate well with pore sizes. While functional characteristics as, for example wettability correlate well with the O/N ratio. Increasing O/N ratios should be interpreted as caused by increasing PVA coverages.The charge on the membrane's surface is ordered in a different way for different pH but are quite similar anyway. The effect of charges on retention of 1:1, 1:2 and 2:1 salts (as tested with: NaCl, Na2SO4 and CaCl2) increases with increasing O/N and wettability. Consequently, the trend of salt retentions can be explained in terms of the PVA coverage and the details of the amphoteric behavior of the three AFC membranes studied.

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“…Colloidal stability of the systems. In the literature there are publications about the stability of other colloidal systems (Huynh et al, 2012;Puziy et al, 2007, Wis´niewska et al, 2015b. In order to prepare the HAP/nanotubes composite, it is necessary to study the interaction mechanism between HAP and nanotubes because this has great influence on the integrative mechanical properties of the composites.…”

Section: Thermal Analysismentioning

confidence: 99%

Hydroxyapatite composites with multiwalled carbon nanotubes

Skwarek

Bolbukh

Janusz

et al. 2017

Adsorption Science & Technology

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The structure of composites based on hydroxyapatite filled with multiwalled carbon nanotubes was investigated using differential scanning calorimetry analysis and X-ray diffraction spectroscopy. Hydroxyapatite was prepared by the wet synthesis in the presence of pristine and oxidised carbon nanotubes. An influence of nature of functional groups of the nanotubes boundary layer on a crystallinity of the inorganic part was evaluated using differential scanning calorimetry analysis and X-ray diffraction spectroscopy. Morphology of composites obtained was studied by nitrogen adsorption/desorption technique and scanning electron microscopy. The hydroxyapatite/ nanotubes interface was characterised using electrochemical methods. The parameters of the electrical double layer: A density of surface charge versus pH, zeta potential versus pH were described. The study has shown that the synthesis of hydroxyapatite/nanotube composites by formation of inorganic part in the presence of carbon filler significantly affect the microstructure, phase composition, crystallinity, hydroxyl content, chemical composition of the mineral part, as well as thermal properties and electrokinetic properties of composite. KeywordsHydroxyapatite, multiwalled carbon nanotubes, composite, thermal analysis, surface properties

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Effect of polyvinyl alcohol adsorption on the mixed alumina–silica–titania suspension stability

Cited by 23 publications

References 21 publications

Flexible free-standing composite films having 3D continuous structures of hollow graphene ellipsoids

Flexible free-standing composite films having 3D continuous structures of hollow graphene ellipsoids

Morphological, chemical and electrical characterization of a family of commercial nanofiltration polyvinyl alcohol coated polypiperazineamide membranes

Hydroxyapatite composites with multiwalled carbon nanotubes

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