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Colloids and Interfaces
Special Issues
Fundamental and Applied Aspects of Nanofluids
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Fundamental and Applied Aspects of Nanofluids

A special issue of Colloids and Interfaces (ISSN 2504-5377).

Deadline for manuscript submissions: closed (31 January 2023) | Viewed by 15666

Special Issue Editors

Dr. Marzieh Lotfi

E-Mail Website
Guest Editor
Department of Chemical Engineering, Jundi-Shapur University of Technology, Dezful, Iran
Interests: non-equilibrium interfacial properties of dynamic interfaces; physical chemistry of nanofluids; colloidal behavior of protein and nanogel; energy integration of solar energy; wastewater treatment; CFD simulation
Dr. Reinhard Miller

E-Mail Website
Guest Editor
Institute for Condensed Matter Physics, Technical University Darmstadt, D-64289 Darmstadt, Germany
Interests: dynamics and mechanics of liquid interfaces; thermodynamics of adsorption of surfactants and proteins; interfacial interactions and 2D rheology; stability of foams and emulsions
Special Issues, Collections and Topics in MDPI journals
Mohammad Firoozzadeh

E-Mail Website
Guest Editor Assistant
Nanofluids & Solar Energy Lab., Jundi-Shapur University of Technology, Dezful, Iran
Interests: nanofluids applications; fluid mechanics; renewable energy; heat transfer; design expert; RetScreen; photovoltaics

Special Issue Information

Dear Colleagues,

Generally, nano-technology is developing rapidly, in many scientific fields, e.g., engineering, medical and cosmetics, chemistry, physics, home appliance, industrial equipment, thermal systems, material science, etc. Therefore, it is a motivation for scholars to focus on this area, fundamentally and applicably. Among different aspects of nanoscience, the subject of “nanofluids” has attracted more attention from researchers. Many scholars who are working in the R&D departments of companies are interested to follow the novel findings of nanofluids. Moreover, there are a large number of students in both M.Sc. and Ph.D. courses around the world who work with nanofluids in their final theses. Therefore, according to the extensive interest of scholars, this topic can be precious and important to consider. In recent years, the extensive studies on nanoscience and nanotechnology have been done by many scholars, all over the world. Many journals are interested in publishing the results of the mentioned studies. Since our journal is devoted to colloids and interface chemistry, and nanofluids properties are directly related to their interfacial properties, we are motivated us to propose this Special Issue. This topic can fulfil the journal scopes, and can be an interesting fit to submit the novel findings about nanofluids. This Special Issue is focused on collecting recent advancements in nanofluids, including fundamental and applied aspects, with special emphasis on its interfacial phenomenon. All research articles in the following subjects are welcomed (but the scope of the Special Issue is not limited to them): interfacial properties of nanofluids; hydrodynamic of nanofluids flow; heat and mass transfer in nanofluids flow; interfacial phenomena in a nanofluid as a multi-phase medium; environmental aspects of nanofluids; synthesis methods of nanofluids; non-Newtonian and hybrid nanofluids; waste management and recycling of nanofluids; application of nanofluids in energy systems; nanofluids in medical and food sciences; computer methods to predict or optimize the behavior of nanofluids, e.g., Internet of Things (IoT); optimization algorithms; artificial intelligence (AI), RSM, etc.

Dr. Marzieh Lotfi
Dr. Reinhard Miller
Guest Editors

Mohammad Firoozzadeh
Guest Editor Assistant

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Colloids and Interfaces is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • nanofluid
  • nanotechnology
  • physical chemistry
  • colloids and interface
  • nanogel
  • adsorption kinetics and isotherm
  • interfacial rheology
  • hydrodynamics
  • surface activity
  • heat transfer enhancement
  • mass transfer
  • multi-phase
  • bubbly flow
  • environmental treatment
  • non-newtonian fluid
  • energy recycling
  • efficiency enhancement
  • synthesis of nanoparticles
  • drug delivery
  • drag reduction
  • computational fluid dynamics
  • renewable energy
  • artificial intelligence

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (4 papers)

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Research

8 pages, 1742 KiB  
Communication
Superspreading Surfactant on Hydrophobic Porous Substrates
by Wellington Tafireyi, Max Littlewood, Himiyage Chaminda Hemaka Bandulasena, Anna Trybala and Victor Mikhilovich Starov
Colloids Interfaces 2023, 7(2), 38; https://doi.org/10.3390/colloids7020038 - 4 May 2023
Viewed by 1915
Abstract
The wetting behavior of droplets of aqueous surfactant solutions over hydrophobic thin PVDF porous membrane and non-porous hydrophobic PVDF film is investigated for small (~10 μL) droplets of aqueous trisiloxane surfactant solutions: superspreader S 240. The time dependencies of contact angle, droplet radius, [...] Read more.
The wetting behavior of droplets of aqueous surfactant solutions over hydrophobic thin PVDF porous membrane and non-porous hydrophobic PVDF film is investigated for small (~10 μL) droplets of aqueous trisiloxane surfactant solutions: superspreader S 240. The time dependencies of contact angle, droplet radius, wetted area and volume were monitored as well as penetration into the porous substrate. It is shown that the fast spreading of droplets of trisiloxane solutions takes place both in the case of porous and non-porous substrates at a concentration above some critical concentration. It was found that the trisiloxane droplets penetrate into the hydrophobic porous substrates and disappear much faster than on a corresponding hydrophobic non-porous substrate, which was not observed before. This phenomenon is referred to as “superpenetration”. Full article
(This article belongs to the Special Issue Fundamental and Applied Aspects of Nanofluids)
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Graphical abstract

11 pages, 4153 KiB  
Article
Ballpoint/Rollerball Pens: Writing Performance and Evaluation
by Jongju Lee, Sohail Murad and Alex Nikolov
Colloids Interfaces 2023, 7(2), 29; https://doi.org/10.3390/colloids7020029 - 4 Apr 2023
Viewed by 7250
Abstract
Here, a brief history of the development of the ballpoint/rollerball pen and the fountain pen is presented. Their principle of operation is analogous that of multipart microfluidics-type devices, where capillarity–gravity drives the ink, a complex fluid, to flow in the confinement of a [...] Read more.
Here, a brief history of the development of the ballpoint/rollerball pen and the fountain pen is presented. Their principle of operation is analogous that of multipart microfluidics-type devices, where capillarity–gravity drives the ink, a complex fluid, to flow in the confinement of a micrometer-sized canal or to lubricate a ball rotating in a socket. The differences in the operational writing principles of the fountain pen versus the ballpoint/rollerball pen are discussed. The ballpoint/rollerball pen’s manner of writing was monitored using lens end fiber optics and was digitally recorded. The ball rotation rate per unit length was monitored using a piezoelectric disk oscilloscope technique. The role of ink (a complex fluid) chemistry in the wetting phenomenon is elucidated. We also discuss methods for studying and evaluating ink–film–ball–paper surface wetting. The goal of the proposed research is to optimize and improve the writing performance of the ballpoint/rollerball pen. Full article
(This article belongs to the Special Issue Fundamental and Applied Aspects of Nanofluids)
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Graphical abstract

19 pages, 1961 KiB  
Article
On Classification of Water-in-Oil and Oil-in-Water Droplet Generation Regimes in Flow-Focusing Microfluidic Devices
by Ampol Kamnerdsook, Ekachai Juntasaro, Numfon Khemthongcharoen, Mayuree Chanasakulniyom, Witsaroot Sripumkhai, Pattaraluck Pattamang, Chamras Promptmas, Nithi Atthi and Wutthinan Jeamsaksiri
Colloids Interfaces 2023, 7(1), 17; https://doi.org/10.3390/colloids7010017 - 20 Feb 2023
Viewed by 2939
Abstract
The objective of this research work is to propose a phase diagram that can be used to find a proper operating condition for generating droplets of different types. It is found that the phase diagram of QR versus CaD can effectively [...] Read more.
The objective of this research work is to propose a phase diagram that can be used to find a proper operating condition for generating droplets of different types. It is found that the phase diagram of QR versus CaD can effectively classify the droplet generation into three vivid regimes: dripping, jetting and tubing. For the dripping regime, its operating condition is in the range of either CaD < 10−4 and QR < 50 or 10−3 < CaD < 10−4 and QR < 1. For the jetting regime, its operating condition is in the range of either CaD < 1.35 × 10−2 and QR > 100 or CaD > 1.35 × 10−2 and QR > 1. For the tubing regime, its operating condition is in the range of CaD > 1.35 × 10−2 and QR < 1. Full article
(This article belongs to the Special Issue Fundamental and Applied Aspects of Nanofluids)
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16 pages, 3432 KiB  
Article
Interplay of Interfacial and Rheological Properties on Drainage Reduction in CO2 Foam Stabilised by Surfactant/Nanoparticle Mixtures in Brine
by Beatriz Ribeiro Souza de Azevedo, Bruno Giordano Alvarenga, Ana Maria Percebom and Aurora Pérez-Gramatges
Colloids Interfaces 2023, 7(1), 2; https://doi.org/10.3390/colloids7010002 - 5 Jan 2023
Cited by 5 | Viewed by 2600
Abstract
Although nanoparticles (NPs) are known to increase foam stability, foam stabilisation is not observed in all surfactant/NP combinations. The present study evaluates the stability of CO2 foams containing surfactant/NP mixtures with attractive or repulsive electrostatic interactions at the low pH imposed by [...] Read more.
Although nanoparticles (NPs) are known to increase foam stability, foam stabilisation is not observed in all surfactant/NP combinations. The present study evaluates the stability of CO2 foams containing surfactant/NP mixtures with attractive or repulsive electrostatic interactions at the low pH imposed by CO2 in the presence of a high-salinity brine. Three ionic surfactants and two oxide NPs (SiO2 and Al2O3) were used in combinations of similar or opposite charges. Surface tension, viscosity, ζ-potential and hydrodynamic size experiments allowed the analysis of CO2 foam stability based on the impact of surfactant–NP interactions on bulk and interfacial properties. All oppositely charged systems improved the foam half-life; however, a higher NP concentration was required to observe a significant effect when more efficient surfactants were present. Both bulk viscosity and rigidity of the interfacial films drastically increased in these systems, reducing foam drainage. The mixture of SiO2 with a zwitterionic surfactant showed the greatest increase in CO2 foam stability owing to the synergy of these effects, mediated by attractive interactions. This study showed that the use of NPs should be tailored to the surfactant of choice to achieve an interplay of interfacial and rheological properties able to reduce foam drainage in applications involving CO2 foam in brine. Full article
(This article belongs to the Special Issue Fundamental and Applied Aspects of Nanofluids)
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