Determination of dimensions of exfoliating materials in aqueous suspensions

Karpovich, A L; Vlasova, Maria F.; Sapronova, Natalya I.; Sukharev, Valentin S.; Иванов, В. В.

doi:10.1016/j.mex.2015.12.002

Cited by 9 publications

(8 citation statements)

References 7 publications

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“…Laponite nanosilicates (Na 0.7 Si 8 Mg 5.5 Li 0.3 O 20 (OH) 4 ) are synthetic clays that have similar compositions of bioactive glasses and have a nanodisk-shape with an average diameter of 25 nm and a thickness of 1 nm. − One feature that distinguishes Laponites from natural clays is their excellent uniform dispersibility in the aqueous phase . Laponites have surfaces and edges that are negatively and positively charged, respectively.…”

Section: Chemical Strategies: Nanocomposite Hydrogelsmentioning

confidence: 99%

Physical and Chemical Factors Influencing the Printability of Hydrogel-based Extrusion Bioinks

et al. 2020

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Bioprinting researchers agree that “printability” is a key characteristic for bioink development, but neither the meaning of the term nor the best way to experimentally measure it has been established. Furthermore, little is known with respect to the underlying mechanisms which determine a bioink’s printability. A thorough understanding of these mechanisms is key to the intentional design of new bioinks. For the purposes of this review, the domain of printability is defined as the bioink requirements which are unique to bioprinting and occur during the printing process. Within this domain, the different aspects of printability and the factors which influence them are reviewed. The extrudability, filament classification, shape fidelity, and printing accuracy of bioinks are examined in detail with respect to their rheological properties, chemical structure, and printing parameters. These relationships are discussed and areas where further research is needed, are identified. This review serves to aid the bioink development process, which will continue to play a major role in the successes and failures of bioprinting, tissue engineering, and regenerative medicine going forward.

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Section: Chemical Strategies: Nanocomposite Hydrogelsmentioning

confidence: 99%

Physical and Chemical Factors Influencing the Printability of Hydrogel-based Extrusion Bioinks

et al. 2020

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“…In the framework of the relaxation theory , based on the seminal work of Redfield, comprehensive models describing the relaxation of interacting and noninteracting solvents have been proposed in the literature, and also used to estimate the size of diamagnetic inorganic particles such as silica and the interaction between NCs and polymers, including qualitative and quantitative measurements of absorption of polymers on the surface. , This concept has growing applications in the characterization of cements and carbon fillers and has recently been refined to include the study of particle shape or the coverage …”

Section: H T 2 Relaxation Of Nanocrystal Dispersionsmentioning

confidence: 99%

“…In the framework of the relaxation theory 30,31 based on the seminal work of Redfield, 32 comprehensive models describing the relaxation of interacting and noninteracting solvents have been proposed in the literature, and also used to estimate the size of diamagnetic inorganic particles such as silica and the interaction between NCs and polymers, including qualitative and quantitative measurements of absorption of polymers on the surface. 33,34 This concept has growing applications in the characterization of cements 35 and carbon fillers 36 and has recently been refined to include the study of particle shape 37 or the coverage. 38 Even though the mechanisms that induce NMR relaxation are still debated, 39 with possibly complementary effects due to dipolar interaction and motional constraint, most interpretative models describe solvent as a two-phase system composed of a population of molecules bound to the particle surface and a population of bulk solvent, as depicted in Figure 1.…”

Section: Dispersionsmentioning

confidence: 99%

Surface Characterization of TiO₂ Polymorphic Nanocrystals through ¹H-TD-NMR

et al. 2018

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Nanocrystals (NCs) surface characterization is a fundamental step for understanding the physical and chemical phenomena involved at the nanoscale. Surface energy and chemistry depend on particle size and composition, and, in turn, determine the interaction of NCs with the surrounding environment, their properties and stability, and the feasibility of nanocomposites. This work aims at extracting more information on the surface of different titanium dioxide polymorphs using H-TD-NMR of water. Taking advantage of the interaction between water molecules and titanium dioxide NCs, it is possible to correlate the proton transverse relaxation times ( T) as the function of the concentration and the specific surface area (δ· C) and use it as an indicator of the crystal phase. Examples of three different crystals phase, rutile, anatase, and brookite, have been finely characterized and their behavior in water solution have been studied with TD-NMR. The results show a linear correlation between relaxivity ( R) and their concentration C. The resulting slopes, after normalization for the specific surface, represent the surface/water interaction and range from 1.28 g m s of 50 nm rutile nanocrystals to 0.52 for similar sized brookite. Even higher slopes (1.85) characterize smaller rutile NCs, in qualitative accordance with the trends of surface energy. Thanks to proton relaxation phenomena that occur at the NCs surface, it is possible to differentiate the crystal phase and the specific surface area of titanium dioxide polymorphs in water solution.

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“…5 Li 0.3 )Si g O 20 (OH) 4 ]) 0.7 − are compositionally similar to bioactive glasses and have the shape of a nanodisk with an average diameter of 25 nm and a thickness of 1 nm. 15 They are particularly appealing with respect to natural clays due to their excellent uniform dispersibility. 16 Laponite acts as multifunctional physical cross-linking points for polymers, leading to a hydrogel network.…”

Section: ■ Introductionmentioning

confidence: 99%

One-Step Fabrication of Biocompatible Multifaceted Nanocomposite Gels and Nanolayers

et al. 2017

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Nanocomposite gels are a fascinating class of polymeric materials with an integrative assembly of organic molecules and organic/inorganic nanoparticles, offering a unique hybrid network with synergistic properties. The mechanical properties of such networks are similar to those of natural tissues, which make them ideal biomaterial candidates for tissue engineering applications. Existing nanocomposite gel systems, however, lack many desirable gel properties, and their suitability for surface coatings is often limited. To address this issue, this article aims at generating multifunctional nanocomposite gels that are injectable with an appropriate time window, functional with bicyclononynes (BCN), biocompatible and slowly degradable, and possess high mechanical strength. Further, the in situ network-forming property of the proposed system allows the fabrication of ultrathin nanocomposite coatings in the submicrometer range with tunable wettability and roughness. Multifunctional nanocomposite gels were fabricated under cytocompatible conditions (pH 7.4 and T = 37 °C) using laponite clays, isocyanate (NCO)-terminated sP(EO-stat-PO) macromers, and clickable BCN. Several characterization techniques were employed to elucidate the structure-property relationships of the gels. Even though the NCO-sP(EO-stat-PO) macromers could form a hydrogel network in situ on contact with water, the incorporation of laponite led to significant improvement of the mechanical properties. BCN motifs with carbamate links were used for a metal-free click ligation with azide-functional molecules, and the subsequent gradual release of the tethered molecules through the hydrolysis of carbamate bonds was shown. The biocompatibility of the hydrogels was examined through murine macrophages, showing that the material composition strongly affects cell behavior.

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Determination of dimensions of exfoliating materials in aqueous suspensions

Abstract: Graphical abstract

Cited by 9 publications

References 7 publications

Physical and Chemical Factors Influencing the Printability of Hydrogel-based Extrusion Bioinks

Physical and Chemical Factors Influencing the Printability of Hydrogel-based Extrusion Bioinks

Surface Characterization of TiO₂ Polymorphic Nanocrystals through ¹H-TD-NMR

One-Step Fabrication of Biocompatible Multifaceted Nanocomposite Gels and Nanolayers

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Determination of dimensions of exfoliating materials in aqueous suspensions

Abstract: Graphical abstract

Cited by 9 publications

References 7 publications

Physical and Chemical Factors Influencing the Printability of Hydrogel-based Extrusion Bioinks

Physical and Chemical Factors Influencing the Printability of Hydrogel-based Extrusion Bioinks

Surface Characterization of TiO2 Polymorphic Nanocrystals through 1H-TD-NMR

One-Step Fabrication of Biocompatible Multifaceted Nanocomposite Gels and Nanolayers

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Surface Characterization of TiO₂ Polymorphic Nanocrystals through ¹H-TD-NMR