Light‐Induced Water Splitting Causes High‐Amplitude Oscillation of pH‐Sensitive Layer‐by‐Layer Assemblies on TiO<sub>2</sub>

Ulasevich, Sviatlana A.; Brezesinski, Gerald; Möhwald, Helmuth; Fratzl, Peter; Schacher, Felix H.; Poznyak, S.K.; Andreeva, Daria V.; Skorb, Ekaterina V.

doi:10.1002/anie.201604359

Cited by 44 publications

(68 citation statements)

References 24 publications

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“…[8] Recently, we have shown the prospects of nanostructured titania surfaces for the development of lab-on-a-chip, light-triggered systems to guide proteins on the cell surface by dynamic oscillation of soft matter organized on titania to regulate inorganic-organic-polymeric interfaces. [9][10][11] Several studies using surface structuring approaches demonstrate that cells respond to nanotopography. [12][13][14][15][16] This is further supported by the influence of nanoscale features on interactions between biomaterials and host tissues.…”

Section: Introductionmentioning

confidence: 99%

The Role of Titanium Surface Nanostructuring on Preosteoblast Morphology, Adhesion, and Migration

Zhukova

Hiepen

Knaus

et al. 2017

Adv Healthcare Materials

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Surface structuring of titanium-based implants is known to modulate the behavior of adherent cells, but the influence of different nanotopographies is poorly understood. The aim is to investigate preosteoblast proliferation, adhesion, morphology, and migration on surfaces with similar surface chemistry but distinct nanotopographical features. Sonochemical treatment and anodic oxidation are employed to fabricate disordered, mesoporous titania (TMS) and ordered titania nanotubular (TNT) topographies on titanium, respectively. Morphological evaluation reveals that cells are polygonal and well-spread on TMS, but display an elongated, fibroblast-like morphology on TNT surfaces, while they are much flatter on glass. Both nanostructured surfaces impair cell adhesion, but TMS is more favorable for cell growth due to its support of cell attachment and spreading in contrast to TNT. A quantitative wound healing assay in combination with live-cell imaging reveals that cell migration on TMS surfaces has a more collective character than on other surfaces, probably due to a closer proximity between neighboring migrating cells on TMS. The results indicate distinctly different cell adhesion and migration on ordered and disordered titania nanotopographies, providing important information that can be used in optimizing titanium-based scaffold design to foster bone tissue growth and repair while allowing for the encapsulation of drugs into porous titania layer

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Section: Introductionmentioning

confidence: 99%

The Role of Titanium Surface Nanostructuring on Preosteoblast Morphology, Adhesion, and Migration

Zhukova

Hiepen

Knaus

et al. 2017

Adv Healthcare Materials

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“…Previously, 4 we demonstrated that the photons from 10 ms of light irradiation would create enough protons on the TiO 2 surface to achieve conformational changes of polyelectrolytes and LbL assemblies on the surface of TiO 2 .…”

Section: Introductionmentioning

confidence: 90%

“…A logical continuation of that work was to use local pH changes during irradiation of semiconductor surfaces. [4][5][6][7][8] For example, local pH changes are generated by irradiation of TiO 2 surfaces. Light-pH coupling in TiO 2 /pH sensitive LbL assemblies was shown to be efficient for high-amplitude non-destructive manipulation of soft matter deposited on the semiconductor surface.…”

Section: Introductionmentioning

confidence: 99%

“…Light-pH coupling in TiO 2 /pH sensitive LbL assemblies was shown to be efficient for high-amplitude non-destructive manipulation of soft matter deposited on the semiconductor surface. 4,5 The composite systems were promising for dynamic regulation of adsorption/desorption of proteins, 6 bacteria, 9 and preosteoblast. 5 Thus, dynamic sensors, antifouling coatings and dynamic protein separation and cleaning systems were proposed.…”

Section: Introductionmentioning

confidence: 99%

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Using a chitosan nanolayer as an efficient pH buffer to protect pH-sensitive supramolecular assemblies

Andreeva

Kollath

Brezhneva

et al. 2017

Phys. Chem. Chem. Phys.

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It is attractive to control the properties of macro objects and films by employing simple nanolayer composites, as in the case of nanoarchitectured Layer-by-Layer (LbL) coating. In this paper, we use chitosan as a surface-based pH buffer to protect adsorbed supramolecular fibres from pH-mediated disassembly. Protons are generated on a titania surface under illumination at 405 nm leading to an appreciable pH change on the surface. We find that supramolecular polymers that are highly sensitive to pH change will not disassemble after irradiation if a nanolayer of chitosan is present. We propose that chitosan can be used as an efficient pH-responsive protective layer for pH sensitive soft materials.

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“…For instance, the light‐induced has strong influence on water‐splitting process in semiconductor materials. Maltanava et al and Ulasevich et al independently introduced the layer‐by‐layer assembly of metal NPs using inorganic TiO 2 materials. Upon UV laser irradiation, they found that the photoactivity of semiconductor materials has strong influence on pH change because of i) the photocatalytic reaction of water splitting, ii) electrochemical process, iii) chemical or biochemical reaction network, and iv) biological process.…”

Section: Factors Affecting Photoactivity Of Spr‐assisted Semiconductorsmentioning

confidence: 99%

Surface Plasmonic‐Assisted Photocatalysis and Optoelectronic Devices with Noble Metal Nanocrystals: Design, Synthesis, and Applications

Zada

Muhammad

Ahmad

et al. 2019

Adv Funct Materials

198

134

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The surface plasmon resonance (SPR) of noble metals is known to improve the efficiency of various processes and devices. The photocatalytic process is the production of fuels and storage of solar photons in chemical bonds without imposing harmful threats to the environment. Photovoltaics are other devices utilizing solar energy for electrical energy. Similarly, other optoelectronic devices like photodetectors absorb photons and convert it into charges via electron–hole dissociation processes. In contrast, light‐emitting optoelectronic devices work based on the phenomenon of charge recombination to produce light. All these devices, however, have efficiency limitations, which impede the application of novel functional materials in these devices. A more direct approach is the utilization of noble metals and their complexes, which significantly enhance the efficiencies of these devices by SPR. This article highlights recent works and applications of noble metals by SPR‐enhanced photocatalysis for hydrogen evolution from water, CO2 conversion into useful compounds, and oxidation of hazardous pollutants. In addition, the plasmon‐enhancement of optoelectronic devices is summarized. Several possible mechanisms that have been previously reported in the literature are discussed in this work, with particular emphasis on different features of these mechanisms involving devices that are not highlighted and therefore need more attention.

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Light‐Induced Water Splitting Causes High‐Amplitude Oscillation of pH‐Sensitive Layer‐by‐Layer Assemblies on TiO₂

Cited by 44 publications

References 24 publications

The Role of Titanium Surface Nanostructuring on Preosteoblast Morphology, Adhesion, and Migration

The Role of Titanium Surface Nanostructuring on Preosteoblast Morphology, Adhesion, and Migration

Using a chitosan nanolayer as an efficient pH buffer to protect pH-sensitive supramolecular assemblies

Surface Plasmonic‐Assisted Photocatalysis and Optoelectronic Devices with Noble Metal Nanocrystals: Design, Synthesis, and Applications

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Light‐Induced Water Splitting Causes High‐Amplitude Oscillation of pH‐Sensitive Layer‐by‐Layer Assemblies on TiO2

Cited by 44 publications

References 24 publications

The Role of Titanium Surface Nanostructuring on Preosteoblast Morphology, Adhesion, and Migration

The Role of Titanium Surface Nanostructuring on Preosteoblast Morphology, Adhesion, and Migration

Using a chitosan nanolayer as an efficient pH buffer to protect pH-sensitive supramolecular assemblies

Surface Plasmonic‐Assisted Photocatalysis and Optoelectronic Devices with Noble Metal Nanocrystals: Design, Synthesis, and Applications

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Product

Resources

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Light‐Induced Water Splitting Causes High‐Amplitude Oscillation of pH‐Sensitive Layer‐by‐Layer Assemblies on TiO₂