Surface-charge properties of fluorine-doped lead borosilicate glass

Shimbo, Masaru; Furukawa, K.; Tanzawa, K.; Higuchi, Toshiharu

doi:10.1109/16.2427

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…We determined E for the blank glass rods and found it to be 66.3±2.5 GPa (mean±SEM), a value that falls within the range of elastic modulus reported for borosilicate glass [6, 11]. In contrast, however, when we determined E for pulled glass using a variety of calibration techniques [1, 2, 4, 5, 7, 9], we found it to be on average 39.5±1.6 GPa.…”

Section: Resultssupporting

confidence: 68%

“…An initial Young's modulus (E) of 66.3 GPa and mass density (ρ) of 2.23 g/cm 3 [6, 10, 12] for borosilicate glass were adjusted systematically and validated by solving for the model's eigenvalues at their corresponding eigenmodes, and comparing with results from the experimental resonant frequencies measured in air. A Poisson's ratio (ν) of 0.22 was chosen for the model based on published properties of borosilicate glass [6, 11], and an initial operating temperature of 25°C was used for simulating stiffness while 14°C was used for determining the harmonics in water. The finite-element building blocks for the model were chosen to have isotropic elastic properties and a nonlinear geometric consideration in their integration characteristics.…”

Section: Methodsmentioning

confidence: 99%

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Glass microneedles for force measurements: a finite-element analysis model

Ayittey

Walker

Rice

et al. 2008

Pflugers Arch - Eur J Physiol

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Changes in developed force (0.1-3.0 μN) observed during contraction of single myofibrils in response to rapidly changing calcium concentrations can be measured using glass microneedles. These microneedles are calibrated for stiffness and deflect on response to developed myofibril force. The precision and accuracy of kinetic measurements are highly dependent on the structural and mechanical characteristics of the microneedles, which are generally assumed to have a linear forcedeflection relationship. We present a finite-element analysis (FEA) model used to simulate the effects of measurable geometry on stiffness as a function of applied force and validate our model with actual measured needle properties. In addition, we developed a simple heuristic constitutive equation that best describes the stiffness of our range of microneedles used and define limits of geometry parameters within which our predictions hold true. Our model also maps a relation between the geometry parameters and natural frequencies in air, enabling optimum parametric combinations for microneedle fabrication that would reflect more reliable force measurement in fluids and physiological environments. We propose a use for this model to aid in the design of microneedles to improve calibration time, reproducibility, and precision for measuring myofibrillar, cellular, and supramolecular kinetic forces.

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Section: Resultssupporting

confidence: 68%

Section: Methodsmentioning

confidence: 99%

Glass microneedles for force measurements: a finite-element analysis model

Ayittey

Walker

Rice

et al. 2008

Pflugers Arch - Eur J Physiol

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Electrical Properties of Silicon/Lead Boro-Alumino-Silicate Glass Interfaces. Insulator Charge and Distribution of Interface States Studied by Photovoltage Measurements

Heilig¹,

Kolbig²,

Reineke³

1989

Phys. Stat. Sol. (a)

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Interface states and insulator charges are investigated in the system silicon/lead boro‐alumino‐silicate glass. A special (detachable) MIS system is used. From a single large‐signal photovoltage pulse the surface potential of Si is determined. The energetic distribution Dit(E of rechargeable interface states could be obtained by such measurements with field modulation. With and without interlayers of CVD‐SiO2 U‐shaped distributions Dit(E) are found. Both for n‐ and p‐type Si depletion is observed at lead glass/Si interfaces; minimum values of Dit are 7 × 1011 cm−2 eV−1. Fixed charges in the glass could be caleulated from experimental results. Positive and negative values, depending on the composition of the glass, are found. The nature of the centres and Fermi level pinning are discussed shortly.

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