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  1. Article ; Online: Rheological study of nanoemulsions with repulsive and attractive interdroplet interactions.

    Abbasian Chaleshtari, Zahra / Foudazi, Reza

    Soft matter

    2023  Volume 19, Issue 43, Page(s) 8337–8348

    Abstract: Nanoemulsions have adjustable transparency, tunable rheology, high stability, and low sensitivity to changes in pH and temperature, which make them interesting for applications such as low-fat and low-calorie foods. In this research, we study model ... ...

    Abstract Nanoemulsions have adjustable transparency, tunable rheology, high stability, and low sensitivity to changes in pH and temperature, which make them interesting for applications such as low-fat and low-calorie foods. In this research, we study model concentrated nanoemulsions which are stabilized by sodium dodecyl sulfate (SDS). To prepare samples in different structural states, semi-dilute nanoemulsions are prepared at 25% droplet volume fraction (
    Language English
    Publishing date 2023-11-08
    Publishing country England
    Document type Journal Article
    ZDB-ID 2191476-X
    ISSN 1744-6848 ; 1744-683X
    ISSN (online) 1744-6848
    ISSN 1744-683X
    DOI 10.1039/d3sm00932g
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Glassy and compressed nanoemulsions stabilized with sodium dodecyl sulfate in the presence of poly(ethylene glycol)-diacrylate.

    Abbasian Chaleshtari, Zahra / Salimi-Kenari, Hamed / Foudazi, Reza

    Soft matter

    2023  Volume 19, Issue 31, Page(s) 5989–6004

    Abstract: The rheology of concentrated nanoemulsions is critical for their formulation in various applications, such as pharmaceuticals, foods, cosmetics, and templating advanced materials. The rheological properties of nanoemulsions depend on interdroplet ... ...

    Abstract The rheology of concentrated nanoemulsions is critical for their formulation in various applications, such as pharmaceuticals, foods, cosmetics, and templating advanced materials. The rheological properties of nanoemulsions depend on interdroplet interactions, Laplace pressure, dispersed phase volume fraction, and continuous phase properties. The interdroplet forces can be tuned by background electrolytes (
    Language English
    Publishing date 2023-08-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 2191476-X
    ISSN 1744-6848 ; 1744-683X
    ISSN (online) 1744-6848
    ISSN 1744-683X
    DOI 10.1039/d3sm00349c
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Exploitation of elasto-inertial fluid flow for the separation of nano-sized particles: Simulating the isolation of extracellular vesicles.

    Pouraria, Hassan / Foudazi, Reza / Houston, Jessica P

    Cytometry. Part A : the journal of the International Society for Analytical Cytology

    2023  Volume 103, Issue 10, Page(s) 786–795

    Abstract: High throughput and efficient separation/isolation of nanoparticles such as exosomes remain a challenge owing to their small size. Elasto-inertial approaches have a new potential to be leveraged because of the ability to achieve fine control over the ... ...

    Abstract High throughput and efficient separation/isolation of nanoparticles such as exosomes remain a challenge owing to their small size. Elasto-inertial approaches have a new potential to be leveraged because of the ability to achieve fine control over the forces that act on extremely small particles. That is, the viscoelasticity of fluid that helps carry biological particles such as extracellular vesicles (EVs) and cells through microfluidic channels can be tailored to optimize how different-sized particles move within the chip. In this contribution, we demonstrate through computational fluid dynamics (CFD) simulations the ability to separate nanoparticles with a size comparable to exosomes from larger spheres with physical properties comparable to cells and larger EVs. Our current design makes use of an efficient flow-focusing geometry at the inlet of the device in which two side channels deliver the sample, while the inner channel injects the sheath flow. Such flow configuration results in an efficient focusing of all the particles near the sidewalls of the channel at the inlet. By dissolving a minute amount of polymer in the sample and sheath fluid, the elastic lift force arises and the initially focused particle adjacent to the wall will gradually migrate toward the center of the channel. This results in larger particles experiencing larger elastic forces, thereby migrating faster toward the center of the channel. By adjusting the size and location of the outlets, nanoparticles comparable to the size of exosomes (30-100 nm) will be effectively separated from other particles. Furthermore, the influence of different parameters such as channel geometry, flow rate, and fluid rheology on the separation process is evaluated by computational analysis.
    Language English
    Publishing date 2023-06-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2099868-5
    ISSN 1552-4930 ; 0196-4763 ; 1552-4922
    ISSN (online) 1552-4930
    ISSN 0196-4763 ; 1552-4922
    DOI 10.1002/cyto.a.24772
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1688: Show issues Location:
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    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
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    Zs.MG 68: Show issues

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  4. Article ; Online: Effect of Cosurfactant on Structure and Properties of Polymerized High Internal Phase Emulsions (PolyHIPEs).

    Zhou, Muchu / Foudazi, Reza

    Langmuir : the ACS journal of surfaces and colloids

    2021  Volume 37, Issue 26, Page(s) 7907–7918

    Abstract: Porous polymerized high internal phase emulsion (polyHIPE) monoliths are synthesized by using Span 80 with different cosurfactants. The results reveal that the void size can be reduced by employing cosurfactants, except for Tween 20. Furthermore, the ... ...

    Abstract Porous polymerized high internal phase emulsion (polyHIPE) monoliths are synthesized by using Span 80 with different cosurfactants. The results reveal that the void size can be reduced by employing cosurfactants, except for Tween 20. Furthermore, the openness of polyHIPEs changes by using different cosurfactants or by varying their concentration. To further investigate the effect of cosurfactants, we perform rheology measurements on the interface of the aqueous and oil phase. This study demonstrates the important role of interfacial elasticity in the successful preparation of polyHIPEs with different morphologies. Additionally, this study suggests that the increase in interfacial elasticity hinders the formation of interconnections between pores, known as windows. Finally, the compression test is performed to investigate the effect of the pore structure on the mechanical properties.
    Language English
    Publishing date 2021-06-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.1c00419
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  5. Article: Effect of Cosurfactant on Structure and Properties of Polymerized High Internal Phase Emulsions (PolyHIPEs)

    Zhou, Muchu / Foudazi, Reza

    Langmuir. 2021 June 21, v. 37, no. 26

    2021  

    Abstract: Porous polymerized high internal phase emulsion (polyHIPE) monoliths are synthesized by using Span 80 with different cosurfactants. The results reveal that the void size can be reduced by employing cosurfactants, except for Tween 20. Furthermore, the ... ...

    Abstract Porous polymerized high internal phase emulsion (polyHIPE) monoliths are synthesized by using Span 80 with different cosurfactants. The results reveal that the void size can be reduced by employing cosurfactants, except for Tween 20. Furthermore, the openness of polyHIPEs changes by using different cosurfactants or by varying their concentration. To further investigate the effect of cosurfactants, we perform rheology measurements on the interface of the aqueous and oil phase. This study demonstrates the important role of interfacial elasticity in the successful preparation of polyHIPEs with different morphologies. Additionally, this study suggests that the increase in interfacial elasticity hinders the formation of interconnections between pores, known as windows. Finally, the compression test is performed to investigate the effect of the pore structure on the mechanical properties.
    Keywords emulsions ; oils ; polymerization ; polysorbates ; rheology
    Language English
    Dates of publication 2021-0621
    Size p. 7907-7918.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.1c00419
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  6. Article ; Online: Porous Hydrogels: Present Challenges and Future Opportunities.

    Foudazi, Reza / Zowada, Ryan / Manas-Zloczower, Ica / Feke, Donald L

    Langmuir : the ACS journal of surfaces and colloids

    2023  Volume 39, Issue 6, Page(s) 2092–2111

    Abstract: In this feature article, we critically review the physical properties of porous hydrogels and their production methods. Our main focus is nondense hydrogels that have physical pores besides the space available between adjacent cross-links in the polymer ... ...

    Abstract In this feature article, we critically review the physical properties of porous hydrogels and their production methods. Our main focus is nondense hydrogels that have physical pores besides the space available between adjacent cross-links in the polymer network. After reviewing theories on the kinetics of swelling, equilibrium swelling, the structure-stiffness relationship, and solute diffusion in dense hydrogels, we propose future directions to develop models for porous hydrogels. The aim is to show how porous hydrogels can be designed and produced for studies leading to the modeling of physical properties. Additionally, different methods that are used for making hydrogels with physically incorporated pores are briefly reviewed while discussing the potentials, challenges, and future directions for each method. Among kinetic methods, we discuss bubble generation approaches including reactions, gas injection, phase separation, electrospinning, and freeze-drying. Templating approaches discussed are solid-phase, self-assembled amphiphiles, emulsion, and foam methods.
    Language English
    Publishing date 2023-01-31
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.2c02253
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Polyfoam: Foam-Templated Microcellular Polymers.

    Zowada, Ryan / Foudazi, Reza

    Langmuir : the ACS journal of surfaces and colloids

    2020  Volume 36, Issue 27, Page(s) 7868–7878

    Abstract: High internal phase emulsion (HIPE) templating has been developed as a robust method for the synthesis of porous polymers with designed porosity and void size. However, it has low starting material efficiency, requiring the removal of over 74% of the ... ...

    Abstract High internal phase emulsion (HIPE) templating has been developed as a robust method for the synthesis of porous polymers with designed porosity and void size. However, it has low starting material efficiency, requiring the removal of over 74% of the starting material to form interconnected porous structures. Foam templating methods attempt to resolve this issue by replacing the internal liquid phase with a gas phase. The current challenge for foam templating is to reach small void sizes (<100 μm), especially when using free-radical polymerization. We use a rapid gas dispersion method to form foam-templated hydrogels, which is an energy-effective method in comparison to the typical HIPE templating approach. We report hydrogels with an average void diameter of 63 μm at 70% porosity. The morphology and properties of foam-templated hydrogels are evaluated to show comparability to the HIPE-templated hydrogels of the same material.
    Language English
    Publishing date 2020-07-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.0c00932
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  8. Article ; Online: Thermoresponsive antifouling ultrafiltration membranes from mesophase templating

    Saadat, Younes / Tabatabaei, Seyed Mostafa / Kim, Kyungtae / Foudazi, Reza

    Journal of Membrane Science. 2023 Oct., v. 684 p.121861-

    2023  

    Abstract: Nanostructured polymers synthesized by lyotropic liquid crystal (LLC) templates with normal hexagonal (H₁) structure exhibit a 3D-continuous transport path, which makes them ideal for membrane separation application. Incorporating additional ... ...

    Abstract Nanostructured polymers synthesized by lyotropic liquid crystal (LLC) templates with normal hexagonal (H₁) structure exhibit a 3D-continuous transport path, which makes them ideal for membrane separation application. Incorporating additional functionality, especially stimuli-responsiveness, in such an ordered structure provides even more application opportunities. In this work, we present the first successful synthesis of H₁-structured thermoresponsive ultrafiltration (UF) membranes via LLC templating. The membrane contains thermoresponsive Pluronic P84 diacrylate (P84DA) which not only acts as the monomer and structure-directing amphiphile, but also enables the pore size change with temperature. Experimental studies reveal that the swelling capacity of H₁-templated polymer as well as permeability and selectivity of the obtained membrane can be altered by changing the temperature. Increasing the temperature from 25 to 45 °C increases the normalized flux from 28 to 68 L m⁻² h⁻¹ μm and molecular weight cut-off (MWCO) from 2200 to 3900 Da. Furthermore, the membrane shows an outstanding fouling resistance against different solutes.
    Keywords liquid crystals ; molecular weight ; permeability ; polymers ; porosity ; surfactants ; temperature ; ultrafiltration ; Thermoresponsive membranes ; Lyotropic liquid crystals ; Mesophases ; Fouling resistant ; Self-assembly
    Language English
    Dates of publication 2023-10
    Publishing place Elsevier B.V.
    Document type Article ; Online
    ZDB-ID 194516-6
    ISSN 0376-7388
    ISSN 0376-7388
    DOI 10.1016/j.memsci.2023.121861
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    In stock of ZB MED Bonn / Germany

    Z 78/706: Show issues

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  9. Article: Alginate and guar gum spray application for improving soil aggregation and soil crust integrity

    Wade, Elijah / Zowada, Ryan / Foudazi, Reza

    Carbohydrate Polymer Technologies and Applications. 2021 Dec. 25, v. 2

    2021  

    Abstract: The destruction of soil through wind erosion is a common issue across the world, but especially for arid and semi-arid regions that deal with water scarcity. The cost due to wind erosion, on and off-site is gravely concerning; requiring both innovative ... ...

    Abstract The destruction of soil through wind erosion is a common issue across the world, but especially for arid and semi-arid regions that deal with water scarcity. The cost due to wind erosion, on and off-site is gravely concerning; requiring both innovative and easily implemented methods to prevent this loss of non-renewable resource. The determining factor of soil loss due to wind erosion is the soil aggregate size, i.e. smaller aggregates are easier to move than large ones. The application of the polysaccharide spray strengthens the soil crust binding soil particles together protecting topsoil from wind erosion. Sprayable polysaccharide solutions applied to soil significantly increased the mean size aggregate diameter of soils 1.5 times thus reducing their susceptibility to wind erosion. The polysaccharide spray application also significantly increased the mechanical strength of the soil indicating an increase in soil crust integrity when applied. We determined the aggregation of the soil is dependent on the infiltration of the spray through the topsoil.
    Keywords alginates ; guar gum ; nonrenewable resources ; polymers ; soil aggregates ; soil aggregation ; soil crusts ; strength (mechanics) ; topsoil ; water shortages ; wind erosion
    Language English
    Dates of publication 2021-1225
    Publishing place Elsevier BV
    Document type Article
    ISSN 2666-8939
    DOI 10.1016/j.carpta.2021.100114
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  10. Article ; Online: Drivers of consumers' behavioral intention toward private umbilical cord blood banking: a review.

    Saraygord-Afshari, Neda / Ghayem, Sonia / Foudazi, Reza / Safa, Majid

    Cell and tissue banking

    2022  Volume 24, Issue 3, Page(s) 651–661

    Abstract: Immunitary bioeconomy encompasses a significant share of the bioeconomy that is accompanied by a ‎high degree of complexity and various religious and ethical controversies for both customers and the ‎service providers. Compared to blood banking, these ... ...

    Abstract Immunitary bioeconomy encompasses a significant share of the bioeconomy that is accompanied by a ‎high degree of complexity and various religious and ethical controversies for both customers and the ‎service providers. Compared to blood banking, these complexities are more substantial for the ‎new state-of-the-art technology of umbilical cord blood (UCB) banking, in which the viable ‎therapeutically active substance of cord blood (i.e., cord blood stem cells (CBSCs)) is banked for much ‎less likely future demand. It became even more complicated when we knew that the main three types ‎of cord blood banking industry (i.e., private, public, or hybrid models) are not the same regarding ‎economic, ‎ethical, and even social considerations. The present paper aims to review and discuss the ‎main drivers of behavioral intention among the customers of private UCB banking. We focused on ‎private UCB banking because, although there is a low likelihood of childs' future need for their siblings' ‎CBSCs, there is an unnecessary growing demand for using private UCB banking services. Based on the ‎previously published pieces of research, we discussed five main influential factors (i.e., awareness, ‎reference group, usability, disease history, and price) that can affect the customers' risk perception ‎‎(and further their behavioral intention) to preserve their child UCB for private applications. Finally, we ‎concluded that private UCB banking must not be considered a commercial activity, and ethically healthcare ‎managers must be more actively involved in ‎facilitating the proper flow of information among the ‎customers.
    MeSH term(s) Child ; Humans ; Blood Banking ; Intention ; Blood Banks ; Fetal Blood ; Umbilical Cord
    Language English
    Publishing date 2022-12-19
    Publishing country Netherlands
    Document type Journal Article ; Review
    ZDB-ID 2170897-6
    ISSN 1573-6814 ; 1389-9333
    ISSN (online) 1573-6814
    ISSN 1389-9333
    DOI 10.1007/s10561-022-10064-y
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 5972: Show issues Location:
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