Adsorption of anionic gold nanoparticles by a layer of cationic microgel particles deposited on a gold-coated, quartz surface: studied by quartz crystal microbalance and atomic force microscopy

Feiler, Adam; Davies, Paul; Vincent, Brian

doi:10.1039/c0sm01319f

Cited by 11 publications

(9 citation statements)

References 35 publications

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“…BSA adsorption was measured using a QCM system (KSV Instruments, Ltd., Finland) equipped with a temperature-controlled chamber and a peristaltic pump. The QCM is a sensitive mass sensor per unit area that measures the change in the fundamental resonance frequency of a quartz crystal sensor due to the adsorption of a material on its surface . One way to describe this adsorption process is with the Sauerbrey equation, which relates the frequency shift (Δ f ) with surface coverage (ΔΓ) over the QCM crystal as follows: Δ Γ = − C Δ f n where C = −17.7 ng cm –2 Hz –1 is a calibration constant that involves the resonance frequency of the unloaded resonator, the density and shear modulus of the quartz, and the electrode area of the sensor, and n is the overtone order, which also normalizes the equation.…”

Section: Experimental and Computational Methodsmentioning

confidence: 99%

Quartz Crystal Microbalance Application and In Silico Studies to Characterize the Interaction of Bovine Serum Albumin with Plasma Polymerized Pyrrole Surfaces: Implications for the Development of Biomaterials

et al. 2023

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Plasma polymerized pyrrole/iodine (PPPy/I) microparticles and bovine serum albumin (BSA) protein have shown interesting results in experimental models for the treatment of traumatic spinal cord injury. By studying the interaction between BSA and PPPy/I by a quartz crystal microbalance (QCM) and docking, we obtained important results to elucidate possible cellular interactions and promote the use of these polymers as biomaterials. These measurements were also used to characterize the adsorption process using an equilibrium constant. In addition, atomic force microscopy (AFM) was used to obtain images of the QCM surface sensors before and after BSA adsorption. Furthermore, we carried out molecular dynamics simulations and molecular docking to characterize the molecular recognition between BSA and the previously reported PPPy/I structure. For this study, we used two combinatorial models that have not been tested. Thus, we could determine the electrostatic (ΔG ele) and nonelectrostatic (ΔG nonelec) components of the free binding energy (ΔG b). We demonstrated that BSA is adsorbed on PPPy/I with an adsorption constant of K = 24.35 μ–1 indicating high affinity. This observation combined with molecular docking and binding free energy calculations showed that the interaction between BSA and both combinatorial models of the PPPy structure is spontaneous.

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Section: Experimental and Computational Methodsmentioning

confidence: 99%

Quartz Crystal Microbalance Application and In Silico Studies to Characterize the Interaction of Bovine Serum Albumin with Plasma Polymerized Pyrrole Surfaces: Implications for the Development of Biomaterials

et al. 2023

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“…For the rigid adsorbed layer, the dissipation value is very low. However, the viscoelastic film shows higher energy dissipated through the adsorbed layer, indicating more deformation during the oscillation . The characteristic of the adsorbed lignin polymer on the aluminum oxide surface was determined by the Q-tools software in the QCM-D instrument.…”

Section: Experimental Methodologymentioning

confidence: 99%

Production and Application of Triblock Hydrolysis Lignin-Based Anionic Copolymers in Aqueous Systems

2021

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Although lignin is currently an under-utilized biopolymer, it has the potential to be valorized through different modification pathways to yield alternative products to petroleum-based ones. In this work, hydrolysis lignin (HL) was copolymerized with acrylamide (AM) and acrylic acid (AA) under acidic conditions to generate the lignin/AM polymer (HM), lignin/AA polymer (HA), and lignin/AM/AA copolymer (HAM) with different negative charge densities and molecular weights. Lignin-based polymers characterized by advanced tools, such as proton nuclear magnetic resonance (1H NMR), gel permission chromatography (GPC), and elemental analysis confirmed the successful polymerization of HL with AM, AA, or AM/AA monomers. The adsorption analysis using a quartz crystal microbalance (QCM) revealed that compared to diblock HM and HA, the triblock copolymers of HAM adsorbed more on the Al2O3 surface and generated a bulkier adsorbed layer, which is important for lignin-based coating formulation. HAM1 with a lower charge density yielded a higher surface excess density, while HAM2 with a larger R h occupied more space (153.7 Å2) at the interface of water and Al2O3. In suspension systems, because of the higher M w, R h, and adsorption affinity, the bridging performance of HAM2 was more remarkable than that of the other lignin derivatives for Al2O3 particles via forming stronger flocs (with a deflocculation parameter, T df, of 80.6 s). However, the diblock lignin–AA (HA1) polymer showed the fastest floc regrowth capability after reducing the shear forces (with a reflocculation parameter, T rf, of 62.5 s). The high thermal stability, T g, and rheological characteristics of the HAM copolymer proved that it can be an excellent material for coating formulations and flocculants for wastewater treatment systems.

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“…Quartz crystal microbalance (QCM) is a real-time technique at the nanogram level for measuring the adsorption interaction − of molecules or particles in the environment on the surface of different materials, including polymers, metals, and inorganic oxides. The structure and viscoelasticity of the adsorbed layer on QCM sensors are observed by monitoring the frequency changes of quartz crystals (Δ f ) and dissipation (Δ D ). − Cao et al used QCM technology to study the interaction between the self-assembled polyelectrolyte multilayers containing guanidinium (Gu) moieties and different anions (Cl – , NO 3 – , SO 4 2– , and H 2 PO 4 – ) and found that the functional polyelectrolyte showed more adsorption to H 2 PO 4 – due to its strong binding affinity with Gu groups.…”

Section: Introductionmentioning

confidence: 99%

Construction of Self-Assembled Polyelectrolyte/Cationic Microgel Multilayers and Their Interaction with Anionic Dyes Using Quartz Crystal Microbalance and Atomic Force Microscopy

Zhang

Wang

et al. 2021

ACS Omega

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This study aimed to reveal the interaction between selfassembled multilayers and dye molecules in the environment, which is closely related to the multilayers' stable performance and service life. In this work, the pH-responsive poly (N-isopropylacrylamide-co-2-(dimethylamino) ethyl methacrylate) microgels were prepared by free-radical copolymerization and self-assembled with sodium alginate (SA) into multilayers by the layer-by-layer deposition method. Quartz crystal microbalance (QCM) and atomic force microscopy (AFM) results confirmed the construction of multilayers and the absorbed mass, resulting in a decrease in the frequency shift of the QCM sensor and the deposition of microgel particles on its surface. The interaction between the self-assembled SA/microgel multilayers and anionic dyes in the aqueous solution was further investigated by QCM, and it was found that the electrostatic attraction between dyes and microgels deposited on the QCM sensor surface was much larger than that of the microgels with SA in multilayers, leading to the release of the microgels from the self-assembled structure and a mass loss ratio of 27.6%. AFM observation of the multilayer morphology exposed to dyes showed that 29% of the microgels was peeled off, and the corresponding microgel imprints were generated on the surface. In contrast, the shape and size of the remaining self-assembled microgel particles did not change.

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Adsorption of anionic gold nanoparticles by a layer of cationic microgel particles deposited on a gold-coated, quartz surface: studied by quartz crystal microbalance and atomic force microscopy

Cited by 11 publications

References 35 publications

Quartz Crystal Microbalance Application and In Silico Studies to Characterize the Interaction of Bovine Serum Albumin with Plasma Polymerized Pyrrole Surfaces: Implications for the Development of Biomaterials

Quartz Crystal Microbalance Application and In Silico Studies to Characterize the Interaction of Bovine Serum Albumin with Plasma Polymerized Pyrrole Surfaces: Implications for the Development of Biomaterials

Production and Application of Triblock Hydrolysis Lignin-Based Anionic Copolymers in Aqueous Systems

Construction of Self-Assembled Polyelectrolyte/Cationic Microgel Multilayers and Their Interaction with Anionic Dyes Using Quartz Crystal Microbalance and Atomic Force Microscopy

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