Adsorption of Surface-Modified Silica Nanoparticles to the Interface of Melt Poly(lactic acid) and Supercritical Carbon Dioxide

Sarikhani, Kaveh; Jeddi, Kazem; Thompson, Russell B.; Park, Chul; Chen, P

doi:10.1021/acs.langmuir.5b00306

Cited by 23 publications

(18 citation statements)

References 68 publications

(154 reference statements)

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“…Some of the advantages of using the drop shape method for measuring the interfacial tension include: the ability to use a small volume of liquid; its applicability to liquid‐vapour and liquid‐liquid interfaces; and broad ranges of temperature and pressure. A detailed procedure of this method can be found elsewhere . In the interfacial tension experiments, a pendant drop of a suitable size was formed at the end of a stainless‐steel holder that was connected to a 500 μL syringe (Gastight, Hamilton Co. Model 1750 TLLX) with a blunt needle of diameter 1.8 mm.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The dynamic oil‐water interfacial tension was measured for varying starch nanoparticle concentrations in the aqueous phase. The cuvette containing the drop was housed in an optical viewing cell through which the pendant drop was monitored during the experiment. A magnified image of the pendant drop was acquired by a charged coupled device (CCD) monochrome camera and a microscope.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Effects of starch nanoparticles on phase inversion of Pickering emulsions

2018

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Understanding the effects of interfacial additives such as surface‐active nanoparticles on phase inversion of Pickering emulsions is important from a practical point of view. In this work, we studied the effects of surface‐active starch nanoparticles on catastrophic phase inversion of Pickering emulsions by continuous addition of a dispersed phase. Two types of experimental‐grade starch nanoparticles were used: hydrophilic starch nanoparticles (HSNP) and hydrophobic starch nanoparticles (HOSNP). The dynamic oil‐water interfacial tension was measured using the pendant drop method at varying starch concentrations in the aqueous phase while the contact angles were measured using the sessile drop method of the Axisymmetric Drop Shape Analysis‐Profile (ADSA‐P). Both types of starch nanoparticles (HSNP and HOSNP) were effective in delaying the phase inversion of emulsions from water‐in‐oil (W/O) type to oil‐in‐water (O/W) type. This delay in phase inversion was directly correlated with the concentration of starch nanoparticles. The interfacial tension decreased as the drop aged at a given starch nanoparticle concentration. The contact angles for both types of starch nanoparticles were within the intermediate wettability range that confirmed the irreversible adsorption of starch nanoparticles at the oil/water interface leading to an increased stability of emulsions.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Effects of starch nanoparticles on phase inversion of Pickering emulsions

2018

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“…Thus, the hydrolytic degradation ability of PLLA/silica composites was accelerated in the presence of higher loadings of silica in the polymer matrix. The impact of silica nanoparticles on the interfacial tension between PLA and supercritical CO2 at high temperature and high pressures was examined by Sarikhani and coworkers [92]. The addition of a low loading of silica (less than 2 wt.%) led to reducing the interfacial tension, while the interfacial tension tended to increase when the silica content was larger than 2 wt.%, which was linked to the fact that higher levels of silica originated attractive lateral capillary forces due to the perturbation of the PLA-CO2 interface by particles.…”

Section: Biodegradbility and Other Propertiesmentioning

confidence: 99%

A Review on Synthesis, Properties, and Applications of Polylactic Acid/Silica Composites

Kaseem

Rehman

Hossain³

et al. 2021

Polymers

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Polylactic acid (PLA)/silica composites as multifunctional high-performance materials have been extensively examined in the past few years by virtue of their outstanding properties relative to neat PLA. The fabrication methods, such as melt-mixing, sol–gel, and in situ polymerization, as well as the surface functionalization of silica, used to improve the dispersion of silica in the polymer matrix are outlined. The rheological, thermal, mechanical, and biodegradation properties of PLA/silica nanocomposites are highlighted. The potential applications arising from the addition of silica nanoparticles into the PLA matrix are also described. Finally, we believe that a better understanding of the role of silica additive with current improvement strategies in the dispersion of this additive in the polymer matrix is the key for successful utilization of PLA/silica nanocomposites and to maximize their fit with industrial applications needs.

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“…Nanoparticles can be used to improve PLA foamability through the improvement in crystallization, melt strength, and reduction of interfacial tension of the PLA system. It has been shown that both carbon dioxide (CO 2 ) dissolution [20,21] and the addition of nanoparticles [22] can reduce the interfacial tension of PLA e CO 2 mixtures. In addition, nanoparticles can serve as nucleating agents in the nucleation step of foaming [23,24].…”

Section: Introductionmentioning

confidence: 99%