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Wang C, Wang J, Li Q, Xu S, Yang J. A review on recent development of foam Ceramics prepared by particle-stabilized foaming technique. Adv Colloid Interface Sci 2024; 330:103198. [PMID: 38820884 DOI: 10.1016/j.cis.2024.103198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2024] [Revised: 04/24/2024] [Accepted: 05/18/2024] [Indexed: 06/02/2024]
Abstract
Particle-stabilized technique for fabricating foam ceramics was developed in 2006. Porous ceramics with porosity over 95% can be prepared by this newly developed method. This foaming technique was derived from the principle of Pickering foam to a large extent. The high internal phase volume, narrow distribution of pore size as well as the structural stability of the Pickering system enable the final ceramic products to realize their functionality in a variety of applications. However, the interfacial aspect of the foaming system determines the final product in many ways, which brings this novel method details to explore and possibilities to challenge. The current review introduces the particle-stabilized method combining with colloid and surface science since particles are the building block of ceramic materials. The history of this newly invented method was mentioned at first, followed by foam ceramic products prepared by this foaming technique combining with corresponding mechanism. Some representative applications involving ceramic materials made by particle-stabilized method were discussed. At last, we conclude the overall article and put forward some outlooks and challenges about the future direction of this unique foaming technique.
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Affiliation(s)
- Chao Wang
- Department of Chemistry, College of Science, Beijing Forestry University, Beijing 100083, China.
| | - Jinyang Wang
- Department of Chemistry, College of Science, Beijing Forestry University, Beijing 100083, China
| | - Qiang Li
- Department of Chemistry, College of Science, Beijing Forestry University, Beijing 100083, China
| | - Shandong Xu
- Department of Chemistry, College of Science, Beijing Forestry University, Beijing 100083, China
| | - Jinlong Yang
- State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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2
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Shi Z, Sheng Y, Wu J, Cui J, Lin W, Ngai T. Porous Waterborne Polyurethane Films Templated from Pickering Foams for Fabrication of Synthetic Leather. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:4751-4761. [PMID: 38385682 PMCID: PMC10919083 DOI: 10.1021/acs.langmuir.3c03514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 02/06/2024] [Accepted: 02/07/2024] [Indexed: 02/23/2024]
Abstract
Waterborne polyurethane (WPU) latex nanoparticles with proven interfacial activity were utilized to stabilize air-water interfaces of Pickering foams through interfacial interaction with hydrophobic fumed silica particles (SPs). The rheological properties of the Pickering foam were tailored through adjustment of their SP content, which influenced their formability and stability. A Pickering foam stabilized with WPU and SPs was used as a template to prepare a WPU-SP composite porous film. The as-prepared film had intact open-cell porous structures, which increased its water absorption and water-vapor permeability. The porous film was used as a middle layer in the preparation of synthetic leather via a four-step "drying method". Compared with commercial synthetic leather, the lab-made synthetic leather with a middle layer made of the WPU-SP composite porous film exhibited a richer porous structure, acceptable wetting on a fabric substrate, a thicker porous layer, and higher water-vapor permeability. This work provides a novel and facile approach for preparing WPU-SP Pickering foams. Furthermore, the foams have the potential to function as a sustainable material for creating a porous-structured synthetic leather made from WPU, which may be utilized as an alternative to solvent-based synthetic leather.
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Affiliation(s)
- Zhenghao Shi
- Department
of Chemistry, The Chinese University of
Hong Kong, Shatin, Hong Kong 999077, China
| | - Yifeng Sheng
- Department
of Chemistry, The Chinese University of
Hong Kong, Shatin, Hong Kong 999077, China
| | - Jianhui Wu
- Department
of Biomass and Leather Engineering, Key Laboratory of Leather Chemistry
and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, China
| | - Jiwei Cui
- Key
Laboratory of Colloid and Interface Chemistry of the Ministry of Education,
School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China
| | - Wei Lin
- Department
of Biomass and Leather Engineering, Key Laboratory of Leather Chemistry
and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, China
| | - To Ngai
- Department
of Chemistry, The Chinese University of
Hong Kong, Shatin, Hong Kong 999077, China
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3
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Ashrafizadeh SN, Ganjizade A. Liquid foams: Properties, structures, prevailing phenomena and their applications in chemical/biochemical processes. Adv Colloid Interface Sci 2024; 325:103109. [PMID: 38367337 DOI: 10.1016/j.cis.2024.103109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 12/12/2023] [Accepted: 02/12/2024] [Indexed: 02/19/2024]
Abstract
Liquid foams are gas-liquid dispersions with flexible structures that provide high gas-liquid interfaces. This property nominates liquid foams as excellent gas-liquid contactors, systems that are widely used in the chemical and biochemical industries. However, challenges such as a lack of comprehensive understanding and foam instability have historically hindered their widespread industrial use in most applications. It was not until the recent development of nanofluidics, nanotechnology, surface science, and other related fields that the understanding, analysis, and control of foam phenomena improved. This led to the development of innovative stabilization techniques and foam-based unit operations in chemical and biochemical processes, each of which requires in-depth and exclusive reviews to fully comprehend their potential and limitations and to identify areas for further improvement and innovation. This paper reviews the foams, the common phenomena in them, the characteristics that make them suitable for chemical/biochemical engineering, reports on their current applications and recent developments in this field.
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Affiliation(s)
- Seyed Nezameddin Ashrafizadeh
- Research Lab for Advanced Separation Processes, Department of Chemical Engineering, Iran University of Science and Technology, Narmak, Tehran 16846-13114, Iran.
| | - Ardalan Ganjizade
- Research Lab for Advanced Separation Processes, Department of Chemical Engineering, Iran University of Science and Technology, Narmak, Tehran 16846-13114, Iran
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4
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Sejwal G, Singh SK. Perspective: The unexplored dimensions behind the foam formation in River Yamuna, India. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:90458-90470. [PMID: 37479928 DOI: 10.1007/s11356-023-28857-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 07/14/2023] [Indexed: 07/23/2023]
Abstract
For nearly two years, a persistent foam cover has been observed during the post-monsoon season in the Yamuna River beneath the barrage near Okhla in Delhi, India. This affair has been a matter of public concern now, after the gigantic appearance of foam in November 2021, as the visibility of foam has awakened people's environmental 'conscience' over the 'concealed' chemical pollution. The mechanisms of agents responsible for foaming in rivers, particularly surfactants and phosphates, have received wide attention in the dynamic community of river pollution. Many studies in the past, around the globe, have evidently provided different rationales behind the dense foam formation in rivers, yet the Concerned Govt. Authorities have highlighted the cause of foam formation in the river Yamuna is associated with the presence of detergents and phosphates as foaming agents. Despite this, an aperture with copious unaccounted factors or underlying agents still exists to rationalize the foam formation and persistence. In this article, we outline these unaccounted factors which might be responsible for the foam formation and stabilization and give indications for future research directives towards the emergence of studies regarding the dense foam formation in river Yamuna.
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Affiliation(s)
- Garima Sejwal
- Department of Environmental Engineering, Delhi Technological University, Delhi, 110042, India.
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5
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Hristova M, Lesov I, Mihaylov L, Denkov N, Tcholakova S. Role of particles size on the cohesive strength of non-sintered (green) ceramics. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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6
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Qiao S, Yu H, Wang Y, Zhan L, Liu Q, Fan Z, Sun A. Foam stability of temperature-resistant hydrophobic silica particles in porous media. Front Chem 2022; 10:960067. [PMID: 36118316 PMCID: PMC9472270 DOI: 10.3389/fchem.2022.960067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 07/18/2022] [Indexed: 11/13/2022] Open
Abstract
The world is rich in heavy oil resources, however, the recovery difficulty and cost are both higher than that of conventional crude oil. To date, the most common method of recovering heavy oil is steam flooding. However, once the steam breaks through the geological formation, gas channeling readily occurs, which leads to a rapid decrease of the steam drive efficiency. To improve the swept volume of steam in the geological formation, a series of hydrophobic silica particles for stabilizing foam was synthesized. This kind of particles used hydrophilic nano silica particles as reactant. Hydrophobic groups with cationic long carbon chains were grafted onto the surface of hydrophilic silica particles by synthetic silane quaternary ammonium salt. When the quantity of silane quaternary ammonium salt used in the modification reaction is different, the product had various degrees of wettability. The hydrophobic particles with the contact angle closest to 90° had the best foam stabilization effect on the betaine zwitterionic surfactant LAB. For LAB solution with mass fraction of 0.3%, the half-life of foam was extended into 160% when the mass fraction of particles was 0.5%. The higher the gas-liquid ratio, the better the plugging effect of foam agent with hydrophobic particles presented in porous media. The adsorption test of hydrophobic particles indicated that hydrophobic particles improved the stability of foam liquid membrane by improving the adsorption capacity of surfactant molecules. The thermal stability of hydrophobic silica particles exceeded 200°C, and the good foam stability made it a potential additive for foam oil displacement in high-temperature geological formation.
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Affiliation(s)
- Sanyuan Qiao
- Center of Chemistry for Frontier Technologies, Zhejiang University, Hangzhou, China
- Key Laboratory of Improving Oil Recovery by Ministry of Education, Northeast Petroleum University, Daqing, China
| | - Haibin Yu
- CenerTech Tianjin Chemical Research & Design Institute Co., Ltd, Tianjin, China
- *Correspondence: Ao Sun, ; Haibin Yu,
| | - Yongan Wang
- CNPC, BoHai Drilling Engineering Co, Ltd, Tianjin, China
| | - Lifeng Zhan
- CenerTech Tianjin Chemical Research & Design Institute Co., Ltd, Tianjin, China
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
| | - Qingwang Liu
- Key Laboratory of Improving Oil Recovery by Ministry of Education, Northeast Petroleum University, Daqing, China
| | - Zhenzhong Fan
- Key Laboratory of Improving Oil Recovery by Ministry of Education, Northeast Petroleum University, Daqing, China
| | - Ao Sun
- Center of Chemistry for Frontier Technologies, Zhejiang University, Hangzhou, China
- *Correspondence: Ao Sun, ; Haibin Yu,
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7
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Controlling the Formation of Foams in Broth to Promote the Co-Production of Microbial Oil and Exopolysaccharide in Fed-Batch Fermentation. FERMENTATION 2022. [DOI: 10.3390/fermentation8020068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A large amount of foam is generated in the production of microbial oil and exopolysaccharide (EPS) by Sporidiobolus pararoseus JD-2, which causes low efficiency in fermentation. In this study, we aimed to reduce the negative effects of foams on the co-production of oil and EPS by controlling the formation of foams in broth. As we have found, the formation of foams is positively associated with cell growth state, air entrapment, and properties of broth. The efficient foam-control method of adding 0.03% (v/v) of the emulsified polyoxyethylene polyoxypropylene pentaerythritol ether (PPE) and feeding corn steep liquor (CSL) at 8–24 h with speed of 0.02 L/h considerably improved the fermentation performance of S. pararoseus JD-2, and significantly increased the oil and EPS concentrations by 8.7% and 12.9%, respectively. The biomass, oil, and EPS concentrations were further increased using a foam backflow device combined with adding 0.03% (v/v) of the emulsified PPE and feeding CSL at 8–24 h, which reached to 62.3 ± 1.8 g/L, 31.2 ± 0.8 g/L, and 10.9 ± 0.4 g/L, respectively. The effective strategy for controlling the formation of foams in fermentation broth reported here could be used as a technical reference for producing frothing products in fed-batch fermentation.
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8
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Porous materials fabricated from Pickering foams stabilized by natural plant of Angelica sinensis for removal of Cd (II) and Cu (II). Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128695] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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9
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Mustan F, Politova-Brinkova N, Rossetti D, Rayment P, Tcholakova S. Oil soluble surfactants as efficient foam stabilizers. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.127874] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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10
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Ahmed Abdourahman D, Geniere A, Auriol M, Dalas F, Biance AL, Le Merrer M. Generation and stability of cement soap films. SOFT MATTER 2021; 17:2429-2438. [PMID: 33491726 DOI: 10.1039/d0sm01991g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Foaming a cementitious suspension is a complex process that involves many multiscale chemical, physical and dynamical mechanisms. As a first step, we investigate here experimentally the possibility of withdrawing a single liquid soap film from a suspension of cement. We then determine the film lifetime and if particles are entrained or not. We vary the cement concentration, grain size, rheological properties and withdrawing velocity. We observed that the rheology of the cement paste, characterized through its yield stress, plays a key role in the film formation. We show that an optimum exists, as a low yield stress promotes film creation but is detrimental to the film stability. Another key result is that the rheology alone is not enough to describe film formation: the particle size in the suspension is also crucial, with large particles promoting film creation. Finally, we found that the withdrawing velocity also affects the ability to create films and the possibility to drag particles in them. Experiments performed with a silica suspension for comparison confirm these findings.
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Affiliation(s)
- Djilani Ahmed Abdourahman
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622, Villeurbanne, France.
| | - Arthur Geniere
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622, Villeurbanne, France.
| | - Mélodie Auriol
- Centre de Recherche Paul Pascal, UMR 5031, Université de Bordeaux, CNRS, 115 Avenue du Dr A. Schweitzer, 33600 Pessac, France and LafargeHolcim Innovation Center, 95 rue du Montmurier, 38291 Saint-Quentin-Fallavier, France
| | - Florent Dalas
- LafargeHolcim Innovation Center, 95 rue du Montmurier, 38291 Saint-Quentin-Fallavier, France
| | - Anne-Laure Biance
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622, Villeurbanne, France.
| | - Marie Le Merrer
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622, Villeurbanne, France.
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11
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Denkov N, Tcholakova S, Politova-Brinkova N. Physicochemical control of foam properties. Curr Opin Colloid Interface Sci 2020. [DOI: 10.1016/j.cocis.2020.08.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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12
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Pal N, Verma A, Ojha K, Mandal A. Nanoparticle-modified gemini surfactant foams as efficient displacing fluids for enhanced oil recovery. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113193] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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13
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Li X, Yang Y, Murray BS, Sarkar A. Combination of egg white protein and microgels to stabilize foams: Impact of processing treatments. J FOOD ENG 2020. [DOI: 10.1016/j.jfoodeng.2019.109860] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Ouadaker M, Jiang X, Bowen P, Bienia M, Pagnoux C, Aimable A. Porous granules by freeze granulation of Pickering emulsions stabilized with halloysite particles. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2019.124156] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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15
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Facile synthesis of macroporous zwitterionic hydrogels templated from graphene oxide-stabilized aqueous foams. J Colloid Interface Sci 2019; 553:40-49. [DOI: 10.1016/j.jcis.2019.06.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 06/06/2019] [Accepted: 06/06/2019] [Indexed: 12/14/2022]
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16
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Llamas S, Ponce Torres A, Liggieri L, Santini E, Ravera F. Surface properties of binary TiO2 - SiO2 nanoparticle dispersions relevant for foams stabilization. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.05.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Erasov V, Pokidko B, Pletnev MY. Features of aqueous polymer-stabilized foams particularly containing bentonite particles. J DISPER SCI TECHNOL 2019. [DOI: 10.1080/01932691.2019.1611445] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Vadim Erasov
- Department of Colloid Chemistry, Institute of Fine Chemical Technologies, MIREA – Russian Technological University, Moscow, Russia
| | - Boris Pokidko
- Department of Colloid Chemistry, Institute of Fine Chemical Technologies, MIREA – Russian Technological University, Moscow, Russia
| | - Michael Y. Pletnev
- Department of Colloid Chemistry, Institute of Fine Chemical Technologies, MIREA – Russian Technological University, Moscow, Russia
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18
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Maestro A. Tailoring the interfacial assembly of colloidal particles by engineering the mechanical properties of the interface. Curr Opin Colloid Interface Sci 2019. [DOI: 10.1016/j.cocis.2019.02.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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19
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Alison L, Menasce S, Bouville F, Tervoort E, Mattich I, Ofner A, Studart AR. 3D printing of sacrificial templates into hierarchical porous materials. Sci Rep 2019; 9:409. [PMID: 30674930 PMCID: PMC6344549 DOI: 10.1038/s41598-018-36789-z] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 11/26/2018] [Indexed: 11/25/2022] Open
Abstract
Hierarchical porous materials are widespread in nature and find an increasing number of applications as catalytic supports, biological scaffolds and lightweight structures. Recent advances in additive manufacturing and 3D printing technologies have enabled the digital fabrication of porous materials in the form of lattices, cellular structures and foams across multiple length scales. However, current approaches do not allow for the fast manufacturing of bulk porous materials featuring pore sizes that span broadly from macroscopic dimensions down to the nanoscale. Here, ink formulations are designed and investigated to enable 3D printing of hierarchical materials displaying porosity at the nano-, micro- and macroscales. Pores are generated upon removal of nanodroplets and microscale templates present in the initial ink. Using particles to stabilize the droplet templates is key to obtain Pickering nanoemulsions that can be 3D printed through direct ink writing. The combination of such self-assembled templates with the spatial control offered by the printing process allows for the digital manufacturing of hierarchical materials exhibiting thus far inaccessible multiscale porosity and complex geometries.
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Affiliation(s)
- Lauriane Alison
- Complex Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093, Zürich, Switzerland
| | - Stefano Menasce
- Complex Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093, Zürich, Switzerland
| | - Florian Bouville
- Complex Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093, Zürich, Switzerland
| | - Elena Tervoort
- Complex Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093, Zürich, Switzerland
| | - Iacopo Mattich
- Complex Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093, Zürich, Switzerland
| | - Alessandro Ofner
- Complex Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093, Zürich, Switzerland
| | - André R Studart
- Complex Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093, Zürich, Switzerland.
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Hristova M, Lesov I, Tcholakova S, Goletto V, Denkov N. From Pickering foams to porous carbonate materials: crack-free structuring in drying ceramics. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.05.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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21
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Zhao J, Shimai S, Zhou G, Zhang J, Wang S. Ceramic foams shaped by oppositely charged dispersant and surfactant. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.10.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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Cerbelaud M, Videcoq A, Alison L, Tervoort E, Studart AR. Early Dynamics and Stabilization Mechanisms of Oil-in-Water Emulsions Containing Colloidal Particles Modified with Short Amphiphiles: A Numerical Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:14347-14357. [PMID: 29172534 DOI: 10.1021/acs.langmuir.7b03472] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Emulsions stabilized by mixtures of particles and amphiphilic molecules are relevant for a wide range of applications, but their dynamics and stabilization mechanisms on the colloidal level are poorly understood. Given the challenges to experimentally probe the early dynamics and mechanisms of droplet stabilization, Brownian dynamics simulations are developed here to study the behavior of oil-in-water emulsions stabilized by colloidal particles modified with short amphiphiles. Simulation parameters are based on an experimental system that consists of emulsions obtained with octane as the oil phase and a suspension of alumina colloidal particles modified with short carboxylic acids as the continuous aqueous medium. The numerical results show that attractive forces between the colloidal particles favor the formation of closely packed clusters on the droplet surface or of a percolating network of particles throughout the continuous phase, depending on the amphiphile concentration. Simulations also reveal the importance of a strong adsorption of particles at the liquid interface to prevent their depletion from the droplet surface when another droplet approaches. Strongly adsorbed particles remain immobile on the droplet surface, generating an effective steric barrier against droplet coalescence. These findings provide new insights into the early dynamics and mechanisms of stabilization of emulsions using particles and amphiphilic molecules.
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Affiliation(s)
| | - Arnaud Videcoq
- University Limoges, CNRS, SPCTS, UMR 7315 , F-87000 Limoges, France
| | - Lauriane Alison
- Complex Materials, Department of Materials, ETH Zurich , 8093 Zurich, Switzerland
| | - Elena Tervoort
- Complex Materials, Department of Materials, ETH Zurich , 8093 Zurich, Switzerland
| | - André R Studart
- Complex Materials, Department of Materials, ETH Zurich , 8093 Zurich, Switzerland
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