Quartz crystal microbalance setup for frequency and <i>Q</i>-factor measurements in gaseous and liquid environments

Rodahl, Michael; Höök, Fredrik; Krozer, Anatol; Brzezinski, Peter; Kasemo, Bengt Herbert

doi:10.1063/1.1145396

Cited by 1,182 publications

(1,218 citation statements)

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“…The change in resonance frequency, ΔF, is associated with a change in wet mass, whereas the change in dissipation is related to the viscoelastic properties of the adsorbed layer. 31 For rigidly and uniform adsorbed layers, the frequency change is directly proportional to the mass oscillating with the crystal, Δm (ng cm −2 ), as expressed by the Sauerbrey equation. 32…”

Section: ■ Experimental Detailsmentioning

confidence: 99%

Transparent Films Based on PLA and Montmorillonite with Tunable Oxygen Barrier Properties

Svagan¹,

et al. 2012

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Polylactide (PLA) is viewed as a potential material to replace synthetic plastics (e.g., poly(ethylene terephthalate) (PET)) in food packaging, and there have been a number of developments in this direction. However, for PLA to be competitive in more demanding uses such as the packaging of oxygen-sensitive foods, the oxygen permeability coefficient (OP) needs to be reduced by a factor of ∼10. To achieve this, a layer-by-layer (Lbl) approach was used to assemble alternating layers of montmorillonite clay and chitosan on extruded PLA film surfaces. When 70 bilayers were applied, the OP was reduced by 99 and 96%, respectively, at 20 and 50% RH. These are, to our knowledge, the best improvements in oxygen barrier properties ever reported for a PLA/clay-based film. The process of assembling such multilayer structures was characterized using a quartz crystal microbalance with dissipation monitoring. Transmission electron microscopy revealed a well-ordered laminar structure in the deposited multilayer coatings, and light transmittance results demonstrated the high optical clarity of the coated PLA films.

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Section: ■ Experimental Detailsmentioning

confidence: 99%

Transparent Films Based on PLA and Montmorillonite with Tunable Oxygen Barrier Properties

Svagan¹,

et al. 2012

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“…The experimental AFM and QCM-D results are supported by molecular dynamics (MD) simulations 5 of dyes adsorbed on the (101) facet of anatase TiO 2 immersed in acetonitrile solvent. [25][26][27] The simulations provide atomic-level insight into the density-dependent changes in the arrangement of the adsorbed Z907 molecules.…”

Section: Introductionmentioning

confidence: 99%

In Situ Mapping of the Molecular Arrangement of Amphiphilic Dye Molecules at the TiO₂ Surface of Dye-Sensitized Solar Cells

Voïtchovsky

Astani

Tavernelli

et al. 2015

ACS Appl. Mater. Interfaces

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Citation for published item:o¤ %t hovskyD uF nd esh ri est niD xF nd vernelliD sF nd etre ultD xF nd othlis ergerD F nd tell iD pF nd qr¤ tzelD wF nd erne r rmsD rF @PHISA 9snEsitu m pping of the mole ul r rr ngement of mphiphili dye mole ules t the iyP surf e of dye sensitized sol r ellsF9D eg pplied m teri ls interf esFD U @PHAF ppF IHVQREIHVRPF Further information on publisher's website: httpXGGdxFdoiForgGIHFIHPIG s miFS HITQV Publisher's copyright statement: This document is the Accepted Manuscript version of a Published Work that appeared in nal form in ACS applied materials interfaces, copyright c 2015 American Chemical Society after peer review and technical editing by the publisher. To access the nal edited and published work see http://dx.doi.org/10.1021/acsami.5b01638. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Just Accepted "Just Accepted" manuscripts have been peer-reviewed and accepted for publication. They are posted online prior to technical editing, formatting for publication and author proofing. The American Chemical Society provides "Just Accepted" as a free service to the research community to expedite the dissemination of scientific material as soon as possible after acceptance. "Just Accepted" manuscripts appear in full in PDF format accompanied by an HTML abstract. "Just Accepted" manuscripts have been fully peer reviewed, but should not be considered the official version of record. They are accessible to all readers and citable by the Digital Object Identifier (DOI®). "Just Accepted" is an optional service offered to authors. Therefore, the "Just Accepted" Web site may not include all articles that will be published in the journal. After a manuscript is technically edited and formatted, it will be removed from the "Just Accepted" Web site and published as an ASAP article. Note that technical editing may introduce minor changes to the manuscript text and/or graphics which could affect content, and all legal disclaimers and ethical guidelines that apply to the journal pertain. ACS cannot be held responsible for errors or consequences arising from the use of information contained in these "Just Accepted" manuscripts. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

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“…A 5-MHz QCM is sensitive at 1 ng/cm 2 of analyte (Rodahl et al 1995). Amplification is required to achieve higher sensitivity; alternatively, a higher resonant frequency crystal may be used.…”

Section: Quartz Crystal Microbalancementioning

confidence: 99%

Nucleic acid electrochemical and electromechanical biosensors: a review of techniques and developments

Rosario

Mutharasan

2014

Reviews in Analytical Chemistry

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This review comprises the last decade's development on experimental techniques for electrochemical and electromechanical sensing of nucleic acids, which originate from pathogenic bacteria, parasites, and viruses commonly found in food, water, and medical context. The electrochemical devices that are of primary interest are those that use voltammetry for detecting DNA and RNA-associated electrochemically active molecules at the working electrode. Attograms of nucleic acids have been reported to be detectable with electrochemical sensors in a batch-mode measurement arrangement. The masssensing electromechanical devices sense nucleic acids at the femtogram levels in a flow format without a molecular technique for amplifying target strand using polymerase chain reaction. Both underlying physics and methods of various studies are summarized, with discussion on limitations and potentials. We call attention to the need for sensors that not only detect but also confirm detection, as false negatives are not acceptable when one measures pathogenic species.

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Quartz crystal microbalance setup for frequency and Q-factor measurements in gaseous and liquid environments

Cited by 1,182 publications

References 19 publications

Transparent Films Based on PLA and Montmorillonite with Tunable Oxygen Barrier Properties

Transparent Films Based on PLA and Montmorillonite with Tunable Oxygen Barrier Properties

In Situ Mapping of the Molecular Arrangement of Amphiphilic Dye Molecules at the TiO₂ Surface of Dye-Sensitized Solar Cells

Nucleic acid electrochemical and electromechanical biosensors: a review of techniques and developments

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Quartz crystal microbalance setup for frequency and Q-factor measurements in gaseous and liquid environments

Cited by 1,182 publications

References 19 publications

Transparent Films Based on PLA and Montmorillonite with Tunable Oxygen Barrier Properties

Transparent Films Based on PLA and Montmorillonite with Tunable Oxygen Barrier Properties

In Situ Mapping of the Molecular Arrangement of Amphiphilic Dye Molecules at the TiO2 Surface of Dye-Sensitized Solar Cells

Nucleic acid electrochemical and electromechanical biosensors: a review of techniques and developments

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In Situ Mapping of the Molecular Arrangement of Amphiphilic Dye Molecules at the TiO₂ Surface of Dye-Sensitized Solar Cells