Development of a Constant Surface Pressure Penetration Langmuir Balance Based on Axisymmetric Drop Shape Analysis

Wege, H. A.; Holgado-Terriza, Juan A.; Cabrerizo-Vílchez, Miguel A.

doi:10.1006/jcis.2002.8233

Cited by 33 publications

(35 citation statements)

References 27 publications

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“…DINATEN© fits the experimental drop profiles, extracted from digital drop micrographs, to the Young-Laplace equation of capillarity by using Axisymmetric Drop Shape Analysis (ADSA), providing as outputs the drop volume V, the interfacial tension γ, and the interfacial area A. The adsorption process is recorded at constant interfacial area (30 mm 2 ) through a modulated fuzzy logic PID algorithm (proportional, integral, and derivative control) by changing the volume (Wege, Holgado-Terriza, & Cabrerizo-Vílchez, 2002). The drop is immersed in a glass cuvette (Hellma), which contains the oil phase and is kept in a thermostatized cell.…”

Section: Interfacial Tension Set-up and Subphase Exchange Techniquementioning

confidence: 99%

Effect of emulsifier type against the action of bile salts at oil–water interfaces

Torcello‐Gómez

Jódar-Reyes

Maldonado-Valderrama

et al. 2012

Food Research International

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Section: Interfacial Tension Set-up and Subphase Exchange Techniquementioning

confidence: 99%

Effect of emulsifier type against the action of bile salts at oil–water interfaces

Torcello‐Gómez

Jódar-Reyes

Maldonado-Valderrama

et al. 2012

Food Research International

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“…5,10 In these cases, the surface area of the droplet cannot be correlated with its volume using a simple spherical approximation. Meanwhile, the surface tension usually varies with the surface area at the presence of surfactants.…”

Section: Introductionmentioning

confidence: 99%

Automated Droplet Manipulation Using Closed-Loop Axisymmetric Drop Shape Analysis

Yang

Zuo

2016

Langmuir

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Droplet manipulation plays an important role in a wide range of scientific and industrial applications, such as synthesis of thin-film materials, control of interfacial reactions, and operation of digital microfluidics. Compared to micron-sized droplets, which are commonly considered as spherical beads, millimeter-sized droplets are generally deformable by gravity, thus introducing nonlinearity into control of droplet properties. Such a nonlinear drop shape effect is especially crucial for droplet manipulation, even for small droplets, at the presence of surfactants. In this paper, we have developed a novel closed-loop axisymmetric drop shape analysis (ADSA), integrated into a constrained drop surfactometer (CDS), for manipulating millimeter-sized droplets. The closed-loop ADSA generalizes applications of the traditional drop shape analysis from a surface tension measurement methodology to a sophisticated tool for manipulating droplets in real time. We have demonstrated the feasibility and advantages of the closed-loop ADSA in three applications, including control of drop volume by automatically compensating natural evaporation, precise control of surface area variations for high-fidelity biophysical simulations of natural pulmonary surfactant, and steady control of surface pressure for in situ Langmuir–Blodgett transfer from droplets. All these applications have demonstrated the accuracy, versatility, applicability, and automation of this new ADSA-based droplet manipulation technique. Combining with CDS, the closed-loop ADSA holds great promise for advancing droplet manipulation in a variety of material and surface science applications, such as thin-film fabrication, self-assembly, and biophysical study of pulmonary surfactant.

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“…An instrumentation service is implemented that allows the remote operation of a pressure-controlled pendantdrop surface balance [20], which can be used to perform noninvasive surfactant adsorption kinetics studies at liquid-fluid interfaces at constant interfacial pressure. After a surfactant solution droplet is formed at the tip of a capillary by means of a microinjector, a measure of interfacial tension (or interfacial pressure, 21) and area (A) over time can be carried out by the instrument device maintaining a control ofthe drop area, drop volume or the interfacial pressure.…”

Section: Resultsmentioning

confidence: 99%

Java-Based Adaptable Middleware Platform for Virtual Instrumentation

Holgado-Terriza

Guillén

Capel

2007

2007 IEEE Symposium on Virtual Environments, Human-Computer Interfaces and Measurement Systems

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a , Abstract -The increasing heterogeneity of instruments, devices, and measurement systems with varying operating systems, processors, hardware devices, resources, etc. interconnected by different networks require the design and development of new middleware platforms, capable of managing the complexity of current distributed systems. In this work the design and development of a new adaptable middleware platform is proposed, based on the study of the state-of-the-art distributed systems technology and the development of novel mechanisms and services on top of known middleware architectures. The new platform will allow for easier instrument and data integration. This paper outlines the steps involved in the development ofthe proposed Jini-based middleware, JOVIM, establishing the requirements for such a platform and describing its main characteristics and mechanisms.

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Development of a Constant Surface Pressure Penetration Langmuir Balance Based on Axisymmetric Drop Shape Analysis

Cited by 33 publications

References 27 publications

Effect of emulsifier type against the action of bile salts at oil–water interfaces

Effect of emulsifier type against the action of bile salts at oil–water interfaces

Automated Droplet Manipulation Using Closed-Loop Axisymmetric Drop Shape Analysis

Java-Based Adaptable Middleware Platform for Virtual Instrumentation

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