Charging compensation of alumina samples by using an oxygen microinjector in the environmental scanning electron microscope

Quan, Xueling; Yuan, Jun; Zhang, Hong; Zhang, Yinqi; Xu, Xuedong; Zhong, Taoxing

doi:10.1002/sca.4950280508

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…However, if the ESP process is continued, the ejection time will be greatly enhanced and further jet instabilities may arise. Another strategy could be the hybridization of this system with a mechanism for charge compensation used in other applications, such as scanning electron microscopy. , Ji et al reported a noticeable charge decrease on Al 2 O 3 samples by employing an oxygen atmosphere through a local oxygen pressure device . Finally, another possible solution is to invert the electrode polarity between layer depositions.…”

Section: Results and Discussionmentioning

confidence: 99%

Direct Writing Electrospinning of Scaffolds with Multidimensional Fiber Architecture for Hierarchical Tissue Engineering

Chen

Malheiro

Blitterswijk

et al. 2017

ACS Appl. Mater. Interfaces

103

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Nanofibrous structures have long been used as scaffolds for tissue engineering (TE) applications, due to their favorable characteristics, such as high porosity, flexibility, high cell attachment and enhanced proliferation, and overall resemblance to native extracellular matrix (ECM). Such scaffolds can be easily produced at a low cost via electrospinning (ESP), but generally cannot be fabricated with a regular and/or complex geometry, characterized by macropores and uniform thickness. We present here a novel technique for direct writing (DW) with solution ESP to produce complex three-dimensional (3D) multiscale and ultrathin (∼1 μm) fibrous scaffolds with desirable patterns and geometries. This technique was simply achieved via manipulating technological conditions, such as spinning solution, ambient conditions, and processing parameters. Three different regimes in fiber morphologies were observed, including bundle with dispersed fibers, bundle with a core of aligned fibers, and single fibers. The transition between these regimes depended on tip to collector distance (Wd) and applied voltage (V), which could be simplified as the ratio V/Wd. Using this technique, a scaffold mimicking the zonal organization of articular cartilage was further fabricated as a proof of concept, demonstrating the ability to better mimic native tissue organization. The DW scaffolds directed tissue organization and fibril matrix orientation in a zone-dependent way. Comparative expression of chondrogenic markers revealed a substantial upregulation of Sox9 and aggrecan (ACAN) on these structures compared to conventional electrospun meshes. Our novel method provides a simple way to produce customized 3D ultrathin fibrous scaffolds, with great potential for TE applications, in particular those for which anisotropy is of importance.

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Section: Results and Discussionmentioning

confidence: 99%

Direct Writing Electrospinning of Scaffolds with Multidimensional Fiber Architecture for Hierarchical Tissue Engineering

Chen

Malheiro

Blitterswijk

et al. 2017

ACS Appl. Mater. Interfaces

103

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“…The charge contrast is predominantly controlled by the localized variation of the SE emission coefficient. As expected, the bright strips below the surface of the steps exhibit greater SE emission than the surrounding areas as evaluated by measuring the sample current, I sc , (Ji et al ., 2005;Quan et al ., 2006) and shown in Figure 5 and Table I.…”

Section: The CCI On Patterned Sapphiresmentioning

confidence: 94%

Charge Contrast Imaging of Nonconductive Samples in the High‐Vacuum Field Emission Scanning Electron Microscope

et al. 2007

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Summary:The charge contrast images (CCI) on insulating or poorly conducting samples were observed under steady-state charging conditions with a thermal field emission scanning electron microscope under high vacuum by using an Everhart-Thornley detector. The charge contrast on plumbous titanate-nickel composite particles and patterned sapphires could be the indicators of near-surface features, compositional variations and conductivity distributions. Optimum imaging conditions for observing the CCI include the electron energy, the electron flux density and the electron dose. Contrast characteristics associated with surface and near-surface secondary electron emission yield enhanced above the trapped charge-up regions, as charge trapping selectively enhanced the poorly conductive phase and lattice distorted area. SCANNING 29: 230-237, 2007.

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“…As for the study of polymer ferroelectrics for space applications [65][66][67][68][69][70][71][72][73][74][75][76] , it should be noted that the processes similar to those during the polymer irradiation under an electron beam in a vacuum SEM chamber can also be observed in real outer space conditions when spacecrafts are bombarded with the particles (electrons, ions) of galactic and solar origin [77,78] . Even more interesting phenomena requiring surface charge compensation (including electromechanical ones) occur when observing dielectric samples in ESEM [79,80] and CryoEM (in particular, hydrocolloids or biological samples [81] ). The mechanisms underlying such phenomena of the sample surface charging can lead to the shift in the accuracy of X-ray spectral analysis and chemical element map quality deviation in variable pressure scanning electron microscopy [82,83] .…”

Section: Article Infomentioning

confidence: 99%

Reaction-diffusion effects and spatiotemporal oscillations under SEM, STM and AFM-assisted charging in fiber-like and wire-like systems: From molecular and quantum wires to cooperative ferroelectric nanofibers and microfibers

Adamovich,

Buryanskaya,

Gradova

et al. 2023

Mater. Tech. Rep.

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This review addresses the problem of reaction-diffusion effects and spatiotemporal oscillations in fiber-like and wire-like systems under the electron beam in SEM and in the presence of electric field in some special AFM techniques, such as current sensing atomic force microscopy (CS-AFM)/conductive atomic force microscopy (C-AFM), electrostatic force microscopy (EFM) and Kelvin probe force microscopy (KPFM) also known as surface potential microscopy. Some similar reaction-diffusion effects also can be observed in scanning capacitance microscopy (SCM), scanning gate microscopy (SGM), scanning voltage microscopy (SVM) and piezoresponse force microscopy (PFM). At the end of this paper the authors provide analysis of their own results and approaches. In particular, the possibility of achieving the ion transfer controlled growth of cells along the ion concentration gradients in reaction-diffusion fibers and actuators is indicated. This fundamental idea is discussed within the framework of the implantable fiber “bioiontronics” and “neuroiontronics” controlled by acoustic and electrical signals that regulate the reaction-diffusion or chemical oscillation activity of such fiber structures as reaction-diffusion actuators and sensors. The literature review includes more than 130 references.

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Charging compensation of alumina samples by using an oxygen microinjector in the environmental scanning electron microscope

Cited by 4 publications

References 16 publications

Direct Writing Electrospinning of Scaffolds with Multidimensional Fiber Architecture for Hierarchical Tissue Engineering

Direct Writing Electrospinning of Scaffolds with Multidimensional Fiber Architecture for Hierarchical Tissue Engineering

Charge Contrast Imaging of Nonconductive Samples in the High‐Vacuum Field Emission Scanning Electron Microscope

Reaction-diffusion effects and spatiotemporal oscillations under SEM, STM and AFM-assisted charging in fiber-like and wire-like systems: From molecular and quantum wires to cooperative ferroelectric nanofibers and microfibers

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