The quartz microbalance: A sensitive tool to probe surface reconstructions on gold electrodes in liquid

Schumacher, R.; Borges, Gary L.; Kanazawa, K. Keiji

doi:10.1016/0039-6028(85)90835-0

Cited by 198 publications

(88 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It has long been known that a crystal with a rough surface has an excess liquid phase response, primarily in its frequency decrease, compared to that predicted by the Kanazawa-Gordon equation. [1][2][3][4][5][6][7][8][9][10][11][12][13] One suggested method of accounting for this response has been to view the response as composed of a Kanazawa term 14 accounting for the entrainment of the liquid plus a Sauerbrey 15 rigid-mass-type term with the mass being given by the liquid ''trapped'' within the surface structure of the crystal. 1,8,13 The assumed additivity of these terms has been the starting point of the model and has not been directly derived from any wave equation for the system.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] One suggested method of accounting for this response has been to view the response as composed of a Kanazawa term 14 accounting for the entrainment of the liquid plus a Sauerbrey 15 rigid-mass-type term with the mass being given by the liquid ''trapped'' within the surface structure of the crystal. 1,8,13 The assumed additivity of these terms has been the starting point of the model and has not been directly derived from any wave equation for the system. It has also been shown experimentally that the state of hydrophobicity/hydrophilicity of the surface of a QCM can influence its response 5,9,11 even when the surface is relatively smooth 9 ͑i.e., surface features of depth Ͻ0.05 m͒.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Surface roughness and interfacial slip boundary condition for quartz crystal microbalances

McHale

Newton

2004

Journal of Applied Physics

View full text Add to dashboard Cite

The response of a quartz crystal microbalance ͑QCM͒ is considered using a wave equation for the substrate and the Navier-Stokes equations for a finite liquid layer under a slip boundary condition. It is shown that when the slip length to shear wave penetration depth is small, the first-order effect of slip is only present in the frequency response. Importantly, in this approximation the frequency response satisfies an additivity relation with a net response equal to a Kanazawa liquid term plus an additional Sauerbrey ''rigid'' liquid mass. For the slip length to result in an enhanced frequency decrease compared to a no-slip boundary condition, it is shown that the slip length must be negative so that the slip plane is located on the liquid side of the interface. It is argued that the physical application of such a negative slip length could be to the liquid phase response of a QCM with a completely wetted rough surface. Effectively, the model recovers the starting assumption of additivity used in the trapped mass model for the liquid phase response of a QCM having a rough surface. When applying the slip boundary condition to the rough surface problem, slip is not at a molecular level, but is a formal hydrodynamic boundary condition which relates the response of the QCM to that expected from a QCM with a smooth surface. Finally, possible interpretations of the results in terms of acoustic reflectivity are developed and the potential limitations of the additivity result should vapor trapping occur are discussed.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface roughness and interfacial slip boundary condition for quartz crystal microbalances

McHale

Newton

2004

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…Quartz crystal microbalance (QCM) is a technique that uses a mass sensor [40][41][42] to measure the adsorption of biopolymers 43,44 or synthetic electrolytes 45 from liquid and allows observation of not only the adsorption kinetics and adsorbed mass but also of the viscoelastic properties of adsorbed polymer layers at the solid liquid interface. 22,46,47 The technique relies upon the resonant frequency of a quartz crystal.…”

Section: Quartz Crystal Microbalancementioning

confidence: 99%

Experimental and computational examination of anastellin (FnIII1c)–polymer interactions

Mallinson

Cheung

Simionesie

et al. 2016

J Biomedical Materials Res

View full text Add to dashboard Cite

Using a combination of experimental and computational approaches, the interaction between anastellin, a recombinant fragment of fibronectin, and representative biomaterial surfaces has been examined. Anastellin and superfibronectin, have been seen to exhibit anti-angiogenic properties and other properties that may make it suitable for consideration for incorporation into biomaterials. The molecular interaction was directly quantified by atomic force microscope (AFM) based force spectroscopy, complemented by adsorption measurements using quartz crystal microbalance (QCM). By AFM, it was found that the anastellin molecule facilitates a stronger adhesion on polyurethane films (72.0 pN nm -1 ) than on poly (methyl methacrylate) films (68.6 pN nm -1 ). However, this is not consistent with the QCM adsorption measurements which shows no significant difference.Molecular dynamics simulations of the behaviour of anastellin on polyurethane in aqueous solution were performed to rationalise the experimental data, and show that anastellin is capable of rapid adsorption to PU while its secondary structure is stable upon adsorption in water.

show abstract

“…Após os trabalhos conduzidos por Nomura e Okuhara 32 , outros grupos de pesquisa comprovaram que, além da viscosidade e densidade do líquido, parâmetros como estrutura de interface sólido/solução 33 , condutividade, polaridade e temperatura [34][35][36] , viscosidade interfacial e características hidrofílicas e hidrofóbicas da superfície do cristal [37][38][39][40][41] , uniformidade do filme sobre o cristal 36 e extensão da área do cristal em contato com a solução 42 são de grande relevância para a aplicação da QCM a ambientes líquidos.…”

Section: Iqn(s)unclassified

Aplicações de QCM, EIS e SPR na investigação de superfícies e interfaces para o desenvolvimento de (bio)sensores

Damos¹,

Kubota²

2004

Quím. Nova

View full text Add to dashboard Cite

Recebido em 1/9/03; aceito em 13/4/04; publicado na web em 27/07/04 APPLICATIONS OF QCM, EIS AND SPR IN THE INVESTIGATION OF SURFACES AND INTERFACES FOR THE DEVELOPMENT OF (BIO)SENSORS.The use of the quartz crystal microbalance process, electrochemical impedance spectroscopy and surface plasmon resonance for characterizing thin films and monitoring interfaces is presented. The theorical aspects of QCM, EIS and SPR are introduced and the main application areas are outlined. Future prospects of the combined applications of QCM, EIS and SPR methods in the studies of interfacial processes at surfaces are also discussed.Keywords: QCM; EIS; SPR. INTRODUÇÃONas últimas décadas, as ciências analíticas têm experimentado um grande avanço relacionado com a capacidade de obtenção de informações químicas de objetos e sistemas. Como resultado, essas informações têm proporcionado um desenvolvimento analítico bem como sua incorporação a outras áreas científicas e técnicas, de forma a resultar na automação, miniaturização e simplificação dos sistemas 1 . Assim sendo, verifica-se o desenvolvimento e o uso apropriado de sistemas de referência, revitalização da análise qualitativa, expansão das fronteiras analíticas clássicas (amostragem, estudos in situ, interdisciplinaridade) e o desenvolvimento de sistemas analíti-cos como sensores químicos, biossensores, dispositivos bioanalíticos e eletrodos quimicamente modificados. Neste contexto, os sensores químicos e biossensores têm adquirido grande importância devido à possibilidade de aplicação destes sistemas para avaliação de processos sintéticos ou biológicos, bem como o entendimento destes processos 2 . Sensores químicos são dispositivos que transformam uma informação química, como a variação da concentração de um componente específico de uma amostra em relação à composição total, em um sinal analítico útil. Estes sistemas contêm duas unidades funcionais básicas: um receptor e um transdutor 3 . As aplicações destes no monitoramento e controle ambiental, em agricultura, indústria de alimentos, farmacêutica e clínica têm possibilitado análises com monitoramento contínuo e in vivo em tempo real 4 . O desenvolvimento de dispositivos sensores tem como premissa básica a avaliação de processos interfaciais e superficiais, uma vez que estes processos são de fundamental importância no entendimento dos mecanismos de interação entre o sistema de reconhecimento e o analito 5,6 . Além disso, o estudo de processos interfaciais e superficiais é de grande relevância para a escolha do método de imobilização de espécies sobre a superfície de eletrodos e a avaliação de problemas associados aos métodos de imobilização. Assim, o estudo destes processos pode auxiliar na escolha do melhor meio de imobilização a ser usado e indicar as principais características (vantagens e desvantagens) associadas a cada método de imobilização [7][8][9][10][11][12] . Desta forma, há de se ressaltar a relevante importância que tem adquirido as técnicas capazes de avaliar fenômenos em superfícies e interfaces, incluindo mét...

show abstract

The quartz microbalance: A sensitive tool to probe surface reconstructions on gold electrodes in liquid

Cited by 198 publications

References 2 publications

Surface roughness and interfacial slip boundary condition for quartz crystal microbalances

Surface roughness and interfacial slip boundary condition for quartz crystal microbalances

Experimental and computational examination of anastellin (FnIII1c)–polymer interactions

Aplicações de QCM, EIS e SPR na investigação de superfícies e interfaces para o desenvolvimento de (bio)sensores

Contact Info

Product

Resources

About