Van der Waals forces in free and wetting liquid films

Emelyanenko, Kirill A.; Emelyanenko, Alexandre M.; Бойнович, Л. Б.

doi:10.1016/j.cis.2019.04.013

Cited by 20 publications

(6 citation statements)

References 67 publications

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“…In particular, the adsorption of PEI to ICG depended on van der Waals force interactions between point charges. 17 , 18 PEI determines the pH-controlled release of nanomaterials in response to decreasing pH, 19 , 20 where free protons and acid roots interact with the PEI amino groups competing with ICG in turn causing drug release ( Figure 2A ). Tightly bound conformational relationships were maintained between ICG, PEI and the cell membrane in a neutral environment.…”

Section: Resultsmentioning

confidence: 99%

Cell Membrane Coated pH-Responsive Intelligent Bionic Delivery Nanoplatform for Active Targeting in Photothermal Therapy

Zhang,

2023

IJN

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Aim To produce pH-responsive bionic high photothermal conversion nanoparticles actively targeting tumors for sensitizing photothermal therapy (PTT). Materials and Methods The bionic nanoparticles (ICG-PEI@HM NPs) were prepared by electrostatic adsorption of indocyanine green (ICG) coupled to polyethyleneimine (PEI) and modified with tumor cell membranes. In vitro and in vivo experiments were conducted to investigate the efficacy of ICG-PEI@HM-mediated PTT. Results The intelligent responsiveness of ICG-PEI@HM to pH promoted the accumulation of ICG and enhanced the PTT performance of ICG-PEI@HM NPs. Compared with free ICG, NPs exhibited great photothermal stability, cellular uptake, and active tumor targeting for PTT. Conclusion ICG-PEI@HM NPs can enhance the efficacy of PTT and can be used as a new strategy for the construction of photothermal agents.

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Section: Resultsmentioning

confidence: 99%

Cell Membrane Coated pH-Responsive Intelligent Bionic Delivery Nanoplatform for Active Targeting in Photothermal Therapy

Zhang,

2023

IJN

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“…4 and Supplementary Table 1). The total surface free energy γ is composed of two parts: the non-polar part γ LW (i.e., Lifshitz-van der Waals) and the polar part γ AB (i.e., Lewis acid-base) 32,33 . The non-polar dispersive component is mainly attributed to the orientation force (Keesom), the induction force (Debye), and the dispersion force (London forces).…”

Section: Resultsmentioning

confidence: 99%

Order−disorder interfaces in a graphitic carbon nitride-nanoclay composite for improved photodynamic antibiotics

et al. 2022

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Antibiotic-resistant microorganisms are a threat to human health. Despite efforts to treat bacterial and fungal infections with photodynamic therapy, it suffers from low light absorption and low singlet oxygen yield. Here, we observe order-disorder interfaces in graphitic carbon nitride (g-C3N4) modified by kaolinite nanoclay via polar interactions, decreasing the band gap of g-C3N4. The polar interactions originate from interactions between the basic amine surface moieties and hydrogen-bonding motifs of g-C3N4 and the hydroxyl groups on the nanoclay surface. Surface free energy theory demonstrates that the electron-acceptor displayed by the nanoclay surface could form a couple with g-C3N4 due to its nucleophilic property. The polar interactions accelerate electron transfer, and the nanoclay surface functions as an electron sink due to its polar surface and free energy. This promotes spin-orbit coupling and intersystem crossing resulting in a higher singlet oxygen yield, even in the dark. The graphitic carbon nitride-kaolinite composite showed improved and faster would healing in rat animal models.

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“…In most cases, the adsorption layer on the surface of the particles in the dispersion system will increase the distance between the particles. At the same time, the Hamaker constant of the adsorption layer material is usually smaller than the solid particles, so the van der Waals force between the particles is reduced [32]. In a shear thickening system with nano-silica as the dispersed phase and polyethylene glycol as the continuous phase, the van der Waals force between the nanoparticles can be ignored [33].…”

Section: Analysis Of the Interaction Between Particles In The Stfmentioning

confidence: 99%

Rheological characteristics analysis of shear thickening fluids based on response surface methodology

Zhao¹,

Zhang²,

Liu³

et al. 2022

Mater. Res. Express

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This paper analyzed the influence of various components and the external environment on the rheological properties of shear thickening fluid (STF). The single-factor experimental study was carried out with the silica particle size, the mass fraction of silica particles, the continuous phase's average molecular weight, and the temperature as the influencing factors. Obtain the influence of various factors on the initial viscosity, critical shear rate, thickening period and thickening ratio of STF samples. According to the crossover relationship between the shear stress and the intermolecular force when the shear thickening occurs, the STF's critical shear rate criterion is constructed. By introducing the mechanical balance between small molecules, the relationship between the particles' volume fraction and the distance between particles in the suspension system is established. The influencing factors and formulas of the STF's critical shear rate and shear capacity are deduced, which supports the conclusions obtained in the single-factor experiment. Based on the single-factor experiment conclusion, the mass fraction of silica particles, the average molecular weight of the continuous phase and the temperature are used as the influencing factors, and the critical shear rate, shear thickening ratio and maximum viscosity are the responses indicators. According to the Box-Behnken response surface methodology (RSM) design, 15 analysis experiments with three factors and three levels are carried out. Obtain the rheological characteristics of the STF and regression equation between each factor, based on the three-dimensional response surface graph and F-value in ANOVA result. We found that among the interaction effects, the interaction between the continuous phase's average molecular weight and the temperature has the most significant impact on the critical shear rate of the STF. The interaction between the silica particles' mass fraction and the continuous phase's average molecular weight significantly impacts the shear thickening ratio of the STF. The interaction between silica particles' mass fraction and the temperature has the most significant impact on the maximum viscosity of the STF. Finally, according to the response surface methodology experimental results and ideal STF rheological characteristics standard in engineering applications, when the mass fraction of silica particles is 35%, the average molecular weight of the continuous phase is 387, and the temperature is 20 ℃. The critical shear rate of the STF system is 5.84 1/s, the shear thickening ratio is 102.8, and the peak viscosity is 1191.7 Pa∙s, reaching the optimal theoretical value within the value scope.

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Van der Waals forces in free and wetting liquid films

Cited by 20 publications

References 67 publications

Cell Membrane Coated pH-Responsive Intelligent Bionic Delivery Nanoplatform for Active Targeting in Photothermal Therapy

Cell Membrane Coated pH-Responsive Intelligent Bionic Delivery Nanoplatform for Active Targeting in Photothermal Therapy

Order−disorder interfaces in a graphitic carbon nitride-nanoclay composite for improved photodynamic antibiotics

Rheological characteristics analysis of shear thickening fluids based on response surface methodology

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