Microcantilever mechanics in flowing viscous fluids

Jana, Anirban; Raman, Arvind; Dhayal, Babita; Tripp, Steven L.; Reifenberger, R.

doi:10.1063/1.2713238

Cited by 26 publications

(11 citation statements)

References 16 publications

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“…As a result, a mass resolution in the picogram range was achieved [4], which outperformed the thermogravimetric approaches by five orders of magnitude. Cantilevers shorter than 10 μm in length with sub-attogram sensitivity were demonstrated in 2004 [5-7], enabling the detection of single virus particles of femtogram mass [8].…”

Section: Introductionmentioning

confidence: 99%

Measurement of Mechanical Properties of Cantilever Shaped Materials

Finot

Passian

Thundat

2008

Sensors

103

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Microcantilevers were first introduced as imaging probes in Atomic Force Microscopy (AFM) due to their extremely high sensitivity in measuring surface forces. The versatility of these probes, however, allows the sensing and measurement of a host of mechanical properties of various materials. Sensor parameters such as resonance frequency, quality factor, amplitude of vibration and bending due to a differential stress can all be simultaneously determined for a cantilever. When measuring the mechanical properties of materials, identifying and discerning the most influential parameters responsible for the observed changes in the cantilever response are important. We will, therefore, discuss the effects of various force fields such as those induced by mass loading, residual stress, internal friction of the material, and other changes in the mechanical properties of the microcantilevers. Methods to measure variations in temperature, pressure, or molecular adsorption of water molecules are also discussed. Often these effects occur simultaneously, increasing the number of parameters that need to be concurrently measured to ensure the reliability of the sensors. We therefore systematically investigate the geometric and environmental effects on cantilever measurements including the chemical nature of the underlying interactions. To address the geometric effects we have considered cantilevers with a rectangular or circular cross section. The chemical nature is addressed by using cantilevers fabricated with metals and/or dielectrics. Selective chemical etching, swelling or changes in Young's modulus of the surface were investigated by means of polymeric and inorganic coatings. Finally to address the effect of the environment in which the cantilever operates, the Knudsen number was determined to characterize the molecule-cantilever collisions. Also bimaterial cantilevers with high thermal sensitivity were used to discern the effect of temperature variations. When appropriate, we use continuum mechanics, which is justified according to the ratio between the cantilever thickness and the grain size of the materials. We will also address other potential applications such as the ageing process of nuclear materials, building materials, and optical fibers, which can be investigated by monitoring their mechanical changes with time. In summary, by virtue of the dynamic response of a miniaturized cantilever shaped material, we present useful measurements of the associated elastic properties.

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Section: Introductionmentioning

confidence: 99%

Measurement of Mechanical Properties of Cantilever Shaped Materials

Finot

Passian

Thundat

2008

Sensors

103

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“…The partial replacement of expensive short fibres by cheap particulates reduces the cost as well as anisotropy. The addition of particulates also helps in keeping the fibres apart, which improves mechanical properties [4,5]. Friend et al observed that the partial replacement of Saffil short fibres by SiC particulates in 7039 Al alloy-based hybrid MMCs did not affect the strength and elastic moduli but improved fracture toughness [6].…”

Section: Introductionmentioning

confidence: 99%

Impression creep behaviour of magnesium alloy-based hybrid composites in the longitudinal direction

Mondal

Kumar

2008

Composites Science and Technology

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“…2, the cantilever bending deflection is steady state with fluctuation of <<1 nm, which is comparable to the thermal noise predicted as Δz th =(k B T/γ) 1/2 ≈0.03 nm, where k B is the Boltzmann's constant, T is the absolute temperature, and γ is a force constant for a cantilever. It is also noted that when a solution is injected, the fluctuation of a cantilever bending deflection is ∼1 nm, which is attributed to fluid flow that can also drive the fluctuation [37]. The injection of DI water that possesses pH 10.8 induces the upward bending deflection of a microcantilever, which is consistent with our anticipation that a buffer solution with its pH of 10.8 permits the i-motif DNA to be in R form resulting in the bending deflection change of a cantilever.…”

mentioning

confidence: 94%

Nanomechanical Motion of Microcantilevers Driven by Ion-Induced DNA Conformational Transitions

et al. 2011

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In this paper, we report the nanomechanical motion of a microcantilever due to the conformational transitions of DNA molecules that are functionalized on the surface of a microcantilever. In particular, the conformational transitions of DNA molecules can be induced by the change of ionic concentrations, which results in the bending deflection motion of a microcantilever. It is shown that a cantilever-DNA hybrid system is able to sense and detect the chemical environment changes such as pH change and/or ionic concentration change, and also that microscale device such as microcantilever can be actuated using molecular conformational changes. Our study provides a new insight into the development of a novel nano-bio-hybrid system based on microdevice coupled with molecular motors for chemical sensing as well as chemical-driven actuation.

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Microcantilever mechanics in flowing viscous fluids

Cited by 26 publications

References 16 publications

Measurement of Mechanical Properties of Cantilever Shaped Materials

Measurement of Mechanical Properties of Cantilever Shaped Materials

Impression creep behaviour of magnesium alloy-based hybrid composites in the longitudinal direction

Nanomechanical Motion of Microcantilevers Driven by Ion-Induced DNA Conformational Transitions

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