Observation and Characterization of Electric Fields at Grain Boundaries

1994 ◽  
Vol 357 ◽  
Author(s):  
B. D. Huey ◽  
D. A. Bonnell ◽  
D. L. Carroll
Keyword(s):  
Grain Boundaries ◽  
Electric Fields ◽  
Detection Scheme ◽  
Force Microscopy ◽  
Potential Barriers ◽  
Atomic Force ◽  
Interface Potential ◽  
Boundary Chemistry ◽  
Probe Response

AbstractVariations in local electric fields near individual grain boundaries have been observed in TiO2 with an ac, non-contact, atomic force microscopy detection scheme. A lateral, in-plane bias was applied to the sample inducing an electric field gradient. A modified AFM then allowed accurate force and force gradient images of both topography and the electric fields to be measured. The sample-tip separation and bias dependence of the AFM probe response to electrostatic fields are used to derive the relationships that allow quantification of lateral fields. With this technique, observation and quantification of potential barriers and enhancement and depletion widths may be observed, especially as a function of boundary chemistry and orientation. Results are discussed in terms of interface potential barrier models.

Conductive Atomic Force Microscopy and Scanning Impedance Microscopy for the Imaging of Electrical Domain in CaCu3Ti4O12 Perovskite Oxide

2009 ◽  
Vol 1232 ◽  
Author(s):  
Raffaella Lo Nigro ◽  
Patrick Fiorenza ◽  
Vito Raineri
Keyword(s):  
Atomic Force Microscopy ◽  
Grain Boundaries ◽  
Electrical Characterization ◽  
Scanning Probe ◽  
Perovskite Oxide ◽  
Electrical Characteristics ◽  
Conductive Atomic Force Microscopy ◽  
Force Microscopy ◽  
Atomic Force

AbstractElectrical characterization of CaCu3Ti4O12 (CCTO) ceramics with scanning probe based techniques has been carried out. In particular, conductive atomic force microscopy (C-AFM) and scanning impedance microscopy (SIM) have been used to demonstrate the presence, shape and size in CCTO ceramics of the different electrically domains, both at the grain boundaries and within the grains. The electrical characteristics of single grains and of single domains have been evaluated and it has been observed that the conductive grains are surrounded by insulating grain boundaries.

scholarly journals The Characterization of the Effect of Electric Fields on Tobacco Mosaic Virus (TMV) Alignment using Atomic Force Microscopy (AFM)

2006 ◽  
Vol 12 (S02) ◽  
pp. 626-627
Author(s):  
E Widjaja ◽  
DJ Eckerle ◽  
JT Sloan ◽  
MT Harris
Keyword(s):  
Atomic Force Microscopy ◽  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Electric Fields ◽  
Force Microscopy ◽  
Atomic Force

Extended abstract of a paper presented at Microscopy and Microanalysis 2006 in Chicago, Illinois, USA, July 30 – August 3, 2006

Rapid, Refined, and Robust Method for Expression, Purification, and Characterization of Recombinant Human Amyloid-beta M1-42

2019 ◽  
Author(s):  
Priya Prakash ◽  
Travis Lantz ◽  
Krupal P. Jethava ◽  
Gaurav Chopra
Keyword(s):  
Amyloid Beta ◽  
Western Blots ◽  
Force Microscopy ◽  
E Coli ◽  
Atomic Force ◽  
Set Up ◽  
Short Time

Amyloid plaques found in the brains of Alzheimer’s disease (AD) patients primarily consists of amyloid beta 1-42 (Ab42). Commercially, Ab42 is synthetized using peptide synthesizers. We describe a robust methodology for expression of recombinant human Ab(M1-42) in Rosetta(DE3)pLysS and BL21(DE3)pLysS competent E. coli with refined and rapid analytical purification techniques. The peptide is isolated and purified from the transformed cells using an optimized set-up for reverse-phase HPLC protocol, using commonly available C18 columns, yielding high amounts of peptide (~15-20 mg per 1 L culture) in a short time. The recombinant Ab(M1-42) forms characteristic aggregates similar to synthetic Ab42 aggregates as verified by western blots and atomic force microscopy to warrant future biological use. Our rapid, refined, and robust technique to purify human Ab(M1-42) can be used to synthesize chemical probes for several downstream in vitro and in vivo assays to facilitate AD research.

Stereometric characterization of Dinizia excelsa Ducke wood from Amazon rainforest using atomic force microscopy

2021 ◽  
Author(s):  
Willian Silva Conceição ◽  
Ştefan Ţălu ◽  
Robert Saraiva Matos ◽  
Glenda Quaresma Ramos ◽  
Fidel Guereiro Zayas ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Amazon Rainforest ◽  
Force Microscopy ◽  
Atomic Force ◽  
Dinizia Excelsa

scholarly journals A Universal Model for the Log-Normal Distribution of Elasticity in Polymeric Gels and Its Relevance to Mechanical Signature of Biological Tissues

Biology ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 64
Author(s):  
Arnaud Millet
Keyword(s):  
Elastic Modulus ◽  
Normal Distribution ◽  
Biological Tissues ◽  
Force Microscopy ◽  
Polymeric Gels ◽  
Atomic Force ◽  
Clear Explanation ◽  
Log Normal ◽  
Log Normal Distribution

The mechanosensitivity of cells has recently been identified as a process that could greatly influence a cell’s fate. To understand the interaction between cells and their surrounding extracellular matrix, the characterization of the mechanical properties of natural polymeric gels is needed. Atomic force microscopy (AFM) is one of the leading tools used to characterize mechanically biological tissues. It appears that the elasticity (elastic modulus) values obtained by AFM presents a log-normal distribution. Despite its ubiquity, the log-normal distribution concerning the elastic modulus of biological tissues does not have a clear explanation. In this paper, we propose a physical mechanism based on the weak universality of critical exponents in the percolation process leading to gelation. Following this, we discuss the relevance of this model for mechanical signatures of biological tissues.

In Situ Characterization of the Mechanical Behavior of Gecko's Spatulae by Atomic Force Microscopy

2013 ◽  
Vol 22 ◽  
pp. 85-93
Author(s):  
Shuang Yi Liu ◽  
Min Min Tang ◽  
Ai Kah Soh ◽  
Liang Hong
Keyword(s):  
Mechanical Behavior ◽  
Hierarchical Level ◽  
Intrinsic Properties ◽  
In Situ Characterization ◽  
Force Microscopy ◽  
Atomic Force ◽  
Theoretical Predictions ◽  
Multi Mode

In-situ characterization of the mechanical behavior of geckos spatula has been carried out in detail using multi-mode AFM system. Combining successful application of a novel AFM mode, i.e. Harmonix microscopy, the more detail elastic properties of spatula is brought to light. The results obtained show the variation of the mechanical properties on the hierarchical level of a seta, even for the different locations, pad and stalk of the spatula. A model, which has been validated using the existing experimental data and phenomena as well as theoretical predictions for geckos adhesion, crawling and self-cleaning of spatulae, is proposed in this paper. Through contrast of adhesive and craw ability of the gecko on the surfaces with different surface roughness, and measurement of the surface adhesive behaviors of Teflon, the most effective adhesion of the gecko is more dependent on the intrinsic properties of the surface which is adhered.

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