Surface forces and friction tuned by thermo-responsive polymer films

Moghaddam, Saeed Zajforoushan; Thormann, Esben

doi:10.1016/j.cocis.2019.12.002

Cited by 13 publications

(8 citation statements)

References 72 publications

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“…Moreover, compared to Fermi resonance, the ss mode of the OCH 2 groups became relatively significant after the temperature was increased to 40 °C, suggesting that there existed a conformational change for the PEG backbones. These results agree with previous reports 61,62 and are consistent with our expectation, namely, that the PEG chains gradually collapsed upon increasing the temperature, showing a gradual thermal coil-to-collapse transition. Under shear flow at an inlet flow rate of 52.2 mL/min, as shown in Figure 5C, the SFG spectra were collected at different temperatures (RT, 30, 40, 50, and 60 °C).…”

supporting

confidence: 94%

Demonstrating the Interfacial Polymer Thermal Transition from Coil-to-Globule to Coil-to-Stretch under Shear Flow Using SFG and MD Simulation

Luo

Pang

Zhu

et al. 2022

J. Phys. Chem. Lett.

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Revealing interfacial shear-induced structural responsiveness has long been an important topic in that most fluids in nature and human life are in motion and cause interesting boundary phenomena. It is amazing how the polymer chain conformation or local structural features at a boundary change under the effective shear condition. In this study, microfluidic-assisted sum frequency generation (SFG) vibrational spectroscopy and all-atom molecular dynamics (MD) simulation are combined to reveal that the shear flow can effectively block the so-called thermal coil-to-globule transition of the poly(N-isopropylacrylamide) (PNIPAM) brushes on the solid substrate, and the normal coil-to-globule transition transfers to a coil-to-stretch one under shear flow with increasing ambient temperature. Such findings are attributed to the balance between the shear flow and the molecular interaction with respect to the polymer chains and adjacent water molecules, thus demonstrating the significant effect of the shear flow on the structural and dynamic behaviors of the polymer chains at the boundaries from the molecular level.

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supporting

confidence: 94%

Demonstrating the Interfacial Polymer Thermal Transition from Coil-to-Globule to Coil-to-Stretch under Shear Flow Using SFG and MD Simulation

Luo

Pang

Zhu

et al. 2022

J. Phys. Chem. Lett.

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“…Polymer brushes are composed of long macromolecules that are anchored by one chain-end to a surface at a density that is high enough such that the polymers stretch out, away from the surface . These brushes have become popular surface modifications in the development of bioinspired lubricants and/or antifouling − and antimicrobial surfaces. , As such, they can be broadly applied, ranging from (bio)medical materials to membrane technologies. , Moreover, polymers are responsive to small changes in their environment, such as temperature, pH, or solvent composition. , Consequently, the properties of polymer brushes alter in response to their environment as well, which has been utilized to control adhesion and friction, , channel flow, , drug release, , and more …”

Section: Introductionmentioning

confidence: 99%

“…10,11 Moreover, polymers are responsive to small changes in their environment, such as temperature, pH, or solvent composition. 12,13 Consequently, the properties of polymer brushes alter in response to their environment as well, which has been utilized to control adhesion and friction, 14,15 channel flow, 16,17 drug release, 18,19 and more. 20 In recent years, the interaction between polymer brushes and gaseous media has become a subject of research attention.…”

Section: Introductionmentioning

confidence: 99%

Fundamentals and Applications of Polymer Brushes in Air

Eck

Chiappisi

Beer

2022

ACS Appl. Polym. Mater.

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For several decades, high-density, end-tethered polymers, forming so-called polymer brushes, have inspired scientists to understand their properties and to translate them to applications. While earlier research focused on polymer brushes in liquids, it was recently recognized that these brushes can find application in air as well. In this review, we report on recent progress in unraveling fundamental concepts of brushes in air, such as their vapor-swelling and solvent partitioning. Moreover, we provide an overview of the plethora of applications in air (e.g., in sensing, separations or smart adhesives) where brushes can be key components. To conclude, we provide an outlook by identifying open questions and issues that, when solved, will pave the way for the large scale application of brushes in air.

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“…Moreover, when these polymers are used for the creation of bioengineered scaffolds for wound healing, they must provide a 3D architecture according to the structural heterogeneity of the host tissue environment [ 92 , 93 ]. The previous allows improving the mechanical and cellular activity (e.g., adhesion and proliferation) required by these structures [ 94 , 95 , 96 ]. In addition, scaffold design needs to consider several features such as cell–tissue interaction; vascularization; scaffold degradation; and loading with drugs, growth factors, cells, and antibacterial material.…”

Section: Bioengineered Thermo-responsive Scaffoldsmentioning

confidence: 99%

Exploration of Bioengineered Scaffolds Composed of Thermo-Responsive Polymers for Drug Delivery in Wound Healing

Henríquez

Castro-Alpízar

Lopretti-Correa

et al. 2021

IJMS

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Innate and adaptive immune responses lead to wound healing by regulating a complex series of events promoting cellular cross-talk. An inflammatory response is presented with its characteristic clinical symptoms: heat, pain, redness, and swelling. Some smart thermo-responsive polymers like chitosan, polyvinylpyrrolidone, alginate, and poly(ε-caprolactone) can be used to create biocompatible and biodegradable scaffolds. These processed thermo-responsive biomaterials possess 3D architectures similar to human structures, providing physical support for cell growth and tissue regeneration. Furthermore, these structures are used as novel drug delivery systems. Locally heated tumors above the polymer lower the critical solution temperature and can induce its conversion into a hydrophobic form by an entropy-driven process, enhancing drug release. When the thermal stimulus is gone, drug release is reduced due to the swelling of the material. As a result, these systems can contribute to the wound healing process in accelerating tissue healing, avoiding large scar tissue, regulating the inflammatory response, and protecting from bacterial infections. This paper integrates the relevant reported contributions of bioengineered scaffolds composed of smart thermo-responsive polymers for drug delivery applications in wound healing. Therefore, we present a comprehensive review that aims to demonstrate these systems’ capacity to provide spatially and temporally controlled release strategies for one or more drugs used in wound healing. In this sense, the novel manufacturing techniques of 3D printing and electrospinning are explored for the tuning of their physicochemical properties to adjust therapies according to patient convenience and reduce drug toxicity and side effects.

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Surface forces and friction tuned by thermo-responsive polymer films

Cited by 13 publications

References 72 publications

Demonstrating the Interfacial Polymer Thermal Transition from Coil-to-Globule to Coil-to-Stretch under Shear Flow Using SFG and MD Simulation

Demonstrating the Interfacial Polymer Thermal Transition from Coil-to-Globule to Coil-to-Stretch under Shear Flow Using SFG and MD Simulation

Fundamentals and Applications of Polymer Brushes in Air

Exploration of Bioengineered Scaffolds Composed of Thermo-Responsive Polymers for Drug Delivery in Wound Healing

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