Metal ion release kinetics from nanoparticle silicone composites

Hahn, Anne; Brandes, Gudrun; Wagener, Philipp; Barcikowski, Stephan

doi:10.1016/j.jconrel.2011.05.023

Cited by 64 publications

(45 citation statements)

References 42 publications

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“…The more noble metal acts as a cathode, and the less noble metal acts as an anode in the electrolyte, thus it provides ion transfer between anode and cathode. Whereas in the case of Au-Ag nanocomposite films, no effect on silver ion release was observed due to the absence of mobile gold ions [12,13].…”

Section: Introductionmentioning

confidence: 85%

Effect of gold alloying on stability of silver nanoparticles and control of silver ion release from vapor-deposited Ag–Au/polytetrafluoroethylene nanocomposites

et al. 2012

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In the present study, nanocomposites containing Ag-Au alloy nanoparticle ensembles with various compositions on polytetrafluoroethylene were prepared by physical vapor deposition. After a certain time of immersion of the samples in water, oxidation and dissolution of the Ag nanoparticles (AgNPs) occurred, and changes in the morphology, optical properties and composition of the nanocomposites were examined using transmission electron microscopy, ultraviolet-visible spectroscopy and X-ray photoelectron spectroscopy (XPS), respectively. The composition-dependence and the time-dependence of the silver ion release were studied, and the concentration of the silver ions in water was detected using inductively coupled plasma mass spectrometry. The results indicate that with increasing gold fraction in the AuAg alloy nanoparticles, a strong improvement of the oxidation resistance of the AgNPs occurs. The dissolution of Ag is rapid at the first contact of the sample with water until a saturation state is reached. XPS synchrotron measurements with different excitation energies show that the depletion of Ag from the nanoparticles does not lead to the formation of a Au-rich shell and that the atomic mobility is high enough in the small nanoparticles of about 5 nm average size to equilibrate any concentration gradient.

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Section: Introductionmentioning

confidence: 85%

Effect of gold alloying on stability of silver nanoparticles and control of silver ion release from vapor-deposited Ag–Au/polytetrafluoroethylene nanocomposites

et al. 2012

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“…where, M t is the mass of ion released at the specified time intervals and M ? is the absolute bioglass mass in the composites [24].…”

Section: Ion Release Studiesmentioning

confidence: 99%

Fabrication and characterization of poly(octanediol citrate)/gallium-containing bioglass microcomposite scaffolds

et al. 2014

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Bone can be affected by osteosarcomae requiring surgical excision of the tumor as part of the treatment regime. Complete removal of cancerous cells is difficult and conventionally requires the removal of a margin of safety around the tumor to offer improved patient prognosis. This work considers a novel series of composite scaffolds based on poly(octanediol citrate) (POC) impregnated with galliumbased bioglass microparticles for possible incorporation into bone following tumor removal. The objective of this research was to fabricate and characterize these scaffolds and subsequently report on their mechanical and biological properties. The porous microcomposite scaffolds with various concentrations of bioglass (10, 20, 30 wt%) incorporated were fabricated using a salt leaching technique. The scaffolds exhibited compression modulus in the range of 0.3-7 MPa. The addition of bioglass increased the mechanical properties even though porosity increased. Furthermore, increasing the concentration of bioglass had a significant influence on glass transition temperature from 2.5°C for the pure polymer to around 25°C for 30 % bioglass-containing composite. The ion release study revealed that composites containing 10 % bioglass had the highest ion release ratio after 28 days of soaking in phosphate buffered saline. The interaction of bioglass phase with POC led to the formation of additional ionic crosslinks aside from covalent crosslinks which further resulted in increased stiffness and decreased weight loss. The osteoblast cells were well attached and growth on composites and collagen synthesis increased particularly with the 10 % bioglass concentration.

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“…The error is always expressed as the largest value between the standard deviation S relevant to the repeated measurements and the standard error Sx c ×t 0.95; 8 . The measurement data have been fitted using both a first-order kinetic equation and a two-fold exponential equation, already reported in literature [39]; the analysis was carried out using Origin Pro 8 software.…”

Section: Analytical Characterizationmentioning

confidence: 99%

“…Therefore, a profile following first order is appropriate to describe the release kinetics of Cu from CuNPs-C-PLA nanocomposite. In a recent work, Barcikowski et al demonstrated that copper ion release from silicone composites is better described by a second-order kinetic profile when both copper and silver NPs are included together in the aforementioned matrix [39], suggesting a mutual influence of the two metals. In the case investigated in this paper, the ion release process appears to be simpler since it is regulated by a single species concentration.…”

Section: Analytical Characterizationmentioning

confidence: 99%

Analytical characterization of laser-generated copper nanoparticles for antibacterial composite food packaging

et al. 2012

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A new type of nanomaterial has been developed as antibacterial additive for food packaging applications. This nanocomposite is composed of copper nanoparticles embedded in polylactic acid, combining the antibacterial properties of copper nanoparticles with the biodegradability of the polymer matrix. Metal nanoparticles have been synthesised by means of laser ablation, a rising and easy route to prepare nanostructures without any capping agent in a liquid environment. As prepared, nanoparticle suspensions have been easily mixed to a polymer solution. The resulting hybrid solutions have been deposited by drop casting, thus obtaining self-standing antibacterial packages. All samples have been characterized by UV-Vis spectroscopy, X-ray photoelectron spectroscopy and electro-thermal atomic absorption spectroscopy. Ion release data have been matched with bioactivity tests performed by Japanese Industrial Standard (JIS) method (JIS Z 2801:2000) against Pseudomonas spp., a very common Gram-negative microbial group able to proliferate in processed food.

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Metal ion release kinetics from nanoparticle silicone composites

Cited by 64 publications

References 42 publications

Effect of gold alloying on stability of silver nanoparticles and control of silver ion release from vapor-deposited Ag–Au/polytetrafluoroethylene nanocomposites

Effect of gold alloying on stability of silver nanoparticles and control of silver ion release from vapor-deposited Ag–Au/polytetrafluoroethylene nanocomposites

Fabrication and characterization of poly(octanediol citrate)/gallium-containing bioglass microcomposite scaffolds

Analytical characterization of laser-generated copper nanoparticles for antibacterial composite food packaging

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