Nanomaterials, nanofillers, and nanocomposites: types and properties

Njuguna, James; Ansari, Farahnaz; Sachse, Sophia; Zhu, Huijun; Rodríguez, Verónica Marchante

doi:10.1533/9780857096678.1.3

Cited by 32 publications

(21 citation statements)

References 52 publications

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“…However, the observed changes often fell within the limits of experimental error (up to 0.4 and 1.6°C, respectively), irrespective of the lengths of n-alkyl substituents on the silicon-oxygen core of POSS (Table 1, items [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The values of T co for PP/POSS nanocomposites were generally slightly decreased with the increasing POSS mass% content (Table 1, items 1-9), in relation to neat PP and irrespective of the kind of the POSS nanofiller applied (POSS8 or POSS18).…”

Section: Resultsmentioning

confidence: 97%

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Study of thermal properties of polyethylene and polypropylene nanocomposites with long alkyl chain-substituted POSS fillers

Niemczyk

Dziubek

Sacher-Majewska

et al. 2016

J Therm Anal Calorim

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The effect of incorporation of octakis({alkyl} dimethylsiloxy)octasilsesquioxanes molecules with n-octyl, n-octadecyl and 4-methyl-hexyl substituents on thermal properties of polypropylene (PP), low-density polyethylene (LDPE) and high-density polyethylene (HDPE) was investigated. Thermal properties of those composite materials were evaluated by means of the differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) methods. The type and mass% content of POSS nanofillers influenced the crystallization and melting properties as well as thermal stability of the obtained polyolefin nanocomposites. The incorporated POSS particles-acting as nucleating agents-improved the crystallization process of those polyolefin materials. The POSS nanofiller with n-octyl substituents turned out the most effective nucleating agent. The addition of POSS nanofiller particles into the polyolefin matrix affected the melting behavior of the nanocomposites obtained, decreasing their melting temperatures. Thermal stability under nitrogen as well as in air atmosphere was most significantly enhanced for polyolefin nanocomposites contained the POSS with n-octadecyl substituents. That may result from improved compatibility of the POSS structure with long n-alkyl chain substituents at the silicon-oxygen core. The uniform dispersion of the long n-alkyl chainsubstituted POSS was confirmed by SEM analysis.

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Section: Resultsmentioning

confidence: 97%

“…POSS particles generally have diameters in the range of 1-3 nm, and they are considered to be the smallest possible particles of silica [2][3][4][5][6]. The POSS structure can be expressed by the general formula (RSiO 3/2 ) n , where R is a reactive or non-reactive group and n can take the values of 6, 8, 10 or higher [2,4,6].…”

Section: Introductionmentioning

confidence: 99%

Study of thermal properties of polyethylene and polypropylene nanocomposites with long alkyl chain-substituted POSS fillers

Niemczyk

Dziubek

Sacher-Majewska

et al. 2016

J Therm Anal Calorim

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“…The high aspect ratio nanoparticles involve nanowires, nanohelices, nanozigzags, nanopillars, nanotubes, or nanobelts. The low aspect ratio nanoparticles are spherical, helical, pillar‐like, pyramidal, and cubic, among others , see Figure A.…”

Section: Nanomaterialsmentioning

confidence: 99%

“…Surface atoms are less stable than bulk atoms, which means that the surface of nanomaterials is more reactive than their bulk counterparts . As the size of particles decreases towards the molecular level, their behavior is more like that of a vapor; as a consequence, nanometer size particles will have much higher mobility than particles in the micrometer scale . Nanomaterials may have a significantly lower melting point or phase transition temperature and appreciably reduced lattice constants, due to a huge fraction of surface atoms in the total amount of atoms.…”

Section: Nanomaterialsmentioning

confidence: 99%

“…As a result, nanoparticles suspended in the atmosphere may be deposited onto surfaces much more slowly than larger particles. Indeed, deposition of nanoparticles will be independent on orientation and will occur as they become trapped in the boundary layer on all surfaces . NMs tend to the aggregation due to their specific surface area and volume effects.…”

Section: Nanomaterialsmentioning

confidence: 99%

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Nanomaterial‐based Sensors for the Study of DNA Interaction with Drugs

2019

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The interaction of drugs with DNA has been searched thoroughly giving rise to an endless number of findings of undoubted importance, such as a prompt alert to harmful substances, ability to explain most of the biological mechanisms, or provision of important clues in targeted development of novel chemotherapeutics. The existence of some drugs that induce oxidative damage is an increasing point of concern as they can cause cellular death, aging, and are closely related to the development of many diseases. Because of a direct correlation between the response, strength/ nature of the interaction and the pharmaceutical action of DNA‐targeted drugs, the electrochemical analysis is based on the signals of DNA before and after the interaction with the DNA‐targeted drug. Nowadays, nanoscale materials are used extensively for offering fascinating characteristics that can be used in designing new strategies for drug‐DNA interaction detection. This work presents a review of nanomaterials (NMs) for the study of drug‐nucleic acid interaction. We summarize types of drug‐DNA interactions, electroanalytical techniques for evidencing these interactions and quantification of drug and/or DNA monitoring.

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Research progress on the correlation between properties of nanoparticles and their dispersion states in polymer matrix

Yang

Cui

Meng

et al. 2021

J of Applied Polymer Sci

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When fabricating polymer nanocomposites (PNCs), it is difficult for nanoparticles to disperse stably in polymer matrix since their high-surface energy can cause them to attract each other. In this paper, we review the effects of nanoparticle size, surface chemical properties, and thermodynamic parameters on the dispersion state of nanoparticles (including inorganic and organic particles) in PNCs and describe some key measures to promote the nanoparticles dispersion. The ideal nanoparticles dispersion in polymer melt is available when the particle size is smaller than the rotation radius of polymer chains and the particle surface is highly compatible or has interactions with the matrix. In polymer solution, establishing proper thermodynamic parameters is necessary to ensure the balance interactions among particles, solvents, and polymers, leading to the successful preparation of PNCs with ideal structure. These results could supply theoretical suggestions for the design of PNCs. Moreover, the equilibrium dispersion may be unavailable without reasonable kinetic parameters, even if the dispersion process is thermodynamically favorable. Therefore, more studies are required on both thermodynamics and kinetics of the dispersion process.

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Nanomaterials, nanofillers, and nanocomposites: types and properties

Cited by 32 publications

References 52 publications

Study of thermal properties of polyethylene and polypropylene nanocomposites with long alkyl chain-substituted POSS fillers

Study of thermal properties of polyethylene and polypropylene nanocomposites with long alkyl chain-substituted POSS fillers

Nanomaterial‐based Sensors for the Study of DNA Interaction with Drugs

Research progress on the correlation between properties of nanoparticles and their dispersion states in polymer matrix

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