Atomic force microscopy probe tip visualization and improvement of images using a simple deconvolution procedure

Markiewicz, Peter; Goh, M. Cynthia

doi:10.1021/la00013a002

Cited by 209 publications

(166 citation statements)

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“…26,35,36 Aggregation can influence dissolution, and vice versa. 37 For example, Zhang et al showed that the oxidation of AgNPs can change their aggregation kinetics.…”

Section: Effects Of Aggregation and Adsorption On Agnp Fate And Transmentioning

confidence: 99%

“…37 For example, Zhang et al showed that the oxidation of AgNPs can change their aggregation kinetics. 35 Dissolution is the focus of this work and will be considered in more detail later. At ionic strengths typical of natural waters, nanoparticle aggregation is expected to occur rapidly.…”

Section: Effects Of Aggregation and Adsorption On Agnp Fate And Transmentioning

confidence: 99%

“…13,14,[51][52][53][54] Indeed, a steep decrease in the Ag + release kinetics of AgNPs has been observed under anaerobic conditions. 13 The overall oxidation reaction for oxidation of Ag 0 by oxygen is 13,35 …”

Section: Silver Nanoparticle Dissolutionmentioning

confidence: 99%

“…10,13,35,55 All of these attempts have arrived at rate laws that are pseudo-first-order in silver concentration. Results from Liu and Hurt suggested that AgNPs may persist in the environment in their colloidal form for only weeks to months.…”

Section: Silver Nanoparticle Dissolutionmentioning

confidence: 99%

“…13 Mass-based dissolution rate constants found in the literature range from 0.01 to 1.5 d -1 under various conditions. 10,13,35 Although these studies are a necessary and good first step to understanding AgNP dissolution, most of the experiments were performed in environmentally irrelevant solutions, such as deionized water, or at environmentally unrealistic concentrations (e.g., on the order of µg/L to mg/L instead of the predicted ng/L concentrations given in Table 2-1). Also, the possible confounding effects of aggregation were uncontrolled in all cases.…”

Section: Silver Nanoparticle Dissolutionmentioning

confidence: 99%

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Controlled Evaluation of Silver Nanoparticle Dissolution Using Atomic Force Microscopy

Kent

Vikesland

2012

Environ. Sci. Technol.

126

129

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Incorporation of silver nanoparticles (AgNPs) into an increasing number of consumer products has led to concern over the potential ecological impacts of their unintended release to the environment. Dissolution is an important environmental transformation that affects the form and concentration of AgNPs in natural waters; however, studies on AgNP dissolution kinetics are complicated by nanoparticle aggregation. Herein, nanosphere lithography (NSL) was used to fabricate uniform arrays of AgNPs immobilized on glass substrates. Nanoparticle immobilization enabled controlled evaluation of AgNP dissolution in an air-saturated phosphate buffer (pH 7, 25 °C) under variable NaCl concentrations in the absence of aggregation. Atomic force microscopy (AFM) was used to monitor changes in particle morphology and dissolution. Over the first day of exposure to ≥10 mM NaCl, the in-plane AgNP shape changed from triangular to circular, the sidewalls steepened, and the height increased by 6-12 nm. Subsequently, particle height and inplane radius decreased at a constant rate over a 2-week period. Dissolution rates varied linearly from 0.4 to 2.2 nm/d over the 10-550 mM NaCl concentration range tested. NaCl-catalyzed dissolution of AgNPs may play an important role in AgNP fate in saline waters and biological media. This study demonstrates the utility of NSL and AFM for the direct investigation of unaggregated AgNP dissolution.iii Acknowledgements I thank my advisor, Dr. Peter Vikesland, for his insight, guidance, and innovative ideas throughout my time at Virginia Tech, and for giving me the opportunity to work on this research project. He was ready and available to help whenever I needed his input. I also thank the other members of my committee,

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“…26,35,36 Aggregation can influence dissolution, and vice versa. 37 For example, Zhang et al showed that the oxidation of AgNPs can change their aggregation kinetics.…”

Section: Effects Of Aggregation and Adsorption On Agnp Fate And Transmentioning

confidence: 99%

Section: Effects Of Aggregation and Adsorption On Agnp Fate And Transmentioning

confidence: 99%

Section: Silver Nanoparticle Dissolutionmentioning

confidence: 99%

Section: Silver Nanoparticle Dissolutionmentioning

confidence: 99%

Section: Silver Nanoparticle Dissolutionmentioning

confidence: 99%

See 3 more Smart Citations

Controlled Evaluation of Silver Nanoparticle Dissolution Using Atomic Force Microscopy

Kent

Vikesland

2012

Environ. Sci. Technol.

126

129

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Morphology of extruded high-density polyethylene pipes studied by atomic force microscopy

Trifonova

Drouillon

Ghanem

et al. 1997

J. Appl. Polym. Sci.

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Atomic force microscopy (AFM) was used to study the structure of extruded polyethylene (PE) pipe. During extrusion, the outer surface of the pipe was cooled with water. Two cross sections, parallel and transverse to the extrusion direction, were examined in order to spatially follow the structural development during extrusion. The morphology revealed was spherulitic, and the spherulites had a mostly banded appearance when viewed under the AFM. We were not able to distinguish an oriented skin layer at the surface of the pipe, either by AFM or polarizing microscopy. The changes in the pipe's structure resulting from the cooling conditions were found to be rather gradual, and no clearly defined zones were observed. A slight orientation towards the extrusion direction was detected only in the area of the pipe crystallized under the lowest degree of undercooling. Measured spherulitic size, band period, and lamellae thickness showed a gradual increase in their values from the cooled to the noncooled surface of the pipe. Transmission electron microscopy (TEM) was used to verify the band period and lamellae thickness measurements done by AFM.

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Scanning Force Microscopy

Schönherr

2004

Encyclopedia of Polymer Science and Technology

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Scanning force microscopy (SFM) belongs to a class of real‐space microscopic techniques, which combine high spatial resolution, 3‐D imaging capabilities, and contrast mechanisms based on specific materials contrast. In particular, in the field of polymer science and technology , SFM quickly developed into an indispensable characterization technique and has found widespread use. In this article the application of SFM to polymers is discussed based on a selection of topics covering the whole breadth from topography imaging to mapping of surface properties and studies of dynamic processes in real time. The basic concepts and modes of SFM, as well as some rudimentary theory, are introduced as a self‐supporting basis for the following sections. The visualization of the morphology and ordering of polymers at various hierarchical levels is reviewed starting from the visualization of single macromolecules, chain packing, and surface crystal structures. The imaging of lamellar crystals, hedrites, and spherulites by SFM approaches is discussed, followed by studies of the effects of deformation and processing, as well as studies on the morphology of latex particles and fibers. The mapping of surface properties and composition in the heterogeneous and surface‐modified polymer systems via the spatially resolved measurement of adhesion and friction forces, as well as surface mechanical properties, are covered. The final section is focused on in situ studies of structure development and dynamic processes, including polymer crystallization, followed in real time by SFM.

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Atomic force microscopy probe tip visualization and improvement of images using a simple deconvolution procedure

Cited by 209 publications

References 0 publications

Controlled Evaluation of Silver Nanoparticle Dissolution Using Atomic Force Microscopy

Controlled Evaluation of Silver Nanoparticle Dissolution Using Atomic Force Microscopy

Morphology of extruded high-density polyethylene pipes studied by atomic force microscopy

Scanning Force Microscopy

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