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Bento CSA, Leite Lopes D, Flora Villarreal C, Empadinhas N, Alarico S, de Sousa HC, Braga MEM. Integrated processes (HPSE+scCO 2) to prepare sterilized alginate-gelatine-based aerogel. Int J Pharm 2024; 662:124546. [PMID: 39097154 DOI: 10.1016/j.ijpharm.2024.124546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2024] [Revised: 07/29/2024] [Accepted: 07/30/2024] [Indexed: 08/05/2024]
Abstract
Biopolymers application in biomedical areas has been limited due to the physicochemical degradation that occurs using conventional processing/sterilization methods (e.g., steam heat, γ-radiation, ethylene oxide). Aiming to avoid/minimize degradation and preserve their properties, supercritical carbon dioxide (scCO2) has been proposed as an alternative sterilization method for such materials. ScCO2 can simultaneously be used as a drying method to produce aerogels (i) and sterilize them (ii). However, a solvent exchange is required to prepare the alcogel from hydrogel, achievable through high-pressure solvent exchange (HPSE) (iii). This study integrated three processes: HPSE, scCO2 drying, and sterilization to prepare alginate-gelatine sterilized aerogels. Two scCO2 sterilization methods were tested. Results showed that sterilization did not compromise the aerogels' chemical, thermal and swelling properties. Conversely, Young's Modulus increased, and BET surface area decreased, due to the structural changes caused by the fast pressurization/depressurization rates applied during sterilization. Regarding the sterilization efficiency, results showed a reduction in contamination throughout the process, achieving a SAL of 10-4. The sterilized aerogels were non-cytotoxic in vitro and showed improved wound-healing properties. The innovative integrated process produced decontaminated/sterile and ready-to-use aerogels reducing process time by 75 %, from 2 days up to 12 h without compromising the aerogel's properties.
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Affiliation(s)
- Cristiana S A Bento
- University of Coimbra, CERES, Department of Chemical Engineering, 3030-790, Coimbra, Portugal
| | - Dhara Leite Lopes
- Federal University of Bahia, School of Pharmacy, 40.170-115, Salvador, BA, Brazil
| | | | - Nuno Empadinhas
- University of Coimbra, Center for Neuroscience and Cell Biology (CNC) and Center for Innovative Biomedicine and Biotechnology (CIBB), Rua Larga, Faculty of Medicine, Polo I, 1st Floor 3004-504, Coimbra, Portugal; University of Coimbra, Institute for Interdisciplinary Research (IIIUC), Casa Costa Alemão - Pólo II, 3030-789, Coimbra, Portugal
| | - Susana Alarico
- University of Coimbra, Center for Neuroscience and Cell Biology (CNC) and Center for Innovative Biomedicine and Biotechnology (CIBB), Rua Larga, Faculty of Medicine, Polo I, 1st Floor 3004-504, Coimbra, Portugal; University of Coimbra, Institute for Interdisciplinary Research (IIIUC), Casa Costa Alemão - Pólo II, 3030-789, Coimbra, Portugal.
| | - Hermínio C de Sousa
- University of Coimbra, CERES, Department of Chemical Engineering, 3030-790, Coimbra, Portugal
| | - Mara E M Braga
- University of Coimbra, CERES, Department of Chemical Engineering, 3030-790, Coimbra, Portugal.
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Tushar SI, Anik HR, Uddin MM, Mandal S, Mohakar V, Rai S, Sharma S. Nanocellulose-based porous lightweight materials with flame retardant properties: A review. Carbohydr Polym 2024; 339:122237. [PMID: 38823907 DOI: 10.1016/j.carbpol.2024.122237] [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: 02/06/2024] [Revised: 05/03/2024] [Accepted: 05/04/2024] [Indexed: 06/03/2024]
Abstract
This review discusses the development and application of nanocellulose (NC)-aerogels, a sustainable and biodegradable biomaterial, with enhanced flame retardant (FR) properties. NC-aerogels combine the excellent physical and mechanical properties of NC with the low density and thermal conductivity of aerogels, making them promising for thermal insulation and other fields. However, the flammability of NC-aerogels limits their use in some applications, such as electromagnetic interference shielding, oil/water separation, and flame-resistant textiles. The review covers the design, fabrication, modification, and working mechanism of NC porous materials, focusing on how advanced technologies can impart FR properties into them. The review also evaluates the FR performance of NC-aerogels by employing widely recognized tests, such as the limited oxygen index, cone calorimeter, and UL-94. The review also explores the integration of innovative and eco-friendly materials, such as MXene, metal-organic frameworks, dopamine, lignin, and alginate, into NC-aerogels, to improve their FR performance and functionality. The review concludes by outlining the potential, challenges, and limitations of future research on FR NC-aerogels, identifying the obstacles and potential solutions, and understanding the current progress and gaps in the field.
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Affiliation(s)
- Shariful Islam Tushar
- Department of Design and Merchandising, Oklahoma State University, Stillwater, OK 74078, USA; Department of Apparel Engineering, Bangladesh University of Textiles, Tejgaon, Dhaka 1208, Bangladesh
| | - Habibur Rahman Anik
- Department of Apparel Engineering, Bangladesh University of Textiles, Tejgaon, Dhaka 1208, Bangladesh; Department of Chemistry and Chemical & Biomedical Engineering, University of New Haven, West Haven, CT 06516, USA
| | - Md Mazbah Uddin
- Department of Textiles, Merchandising, and Interiors, University of Georgia, 305 Sanford Dr., Athens, GA 30602, USA.
| | - Sumit Mandal
- Department of Design and Merchandising, Oklahoma State University, Stillwater, OK 74078, USA
| | - Vijay Mohakar
- Department of Textiles, Merchandising, and Interiors, University of Georgia, 305 Sanford Dr., Athens, GA 30602, USA
| | - Smriti Rai
- Department of Textiles, Merchandising, and Interiors, University of Georgia, 305 Sanford Dr., Athens, GA 30602, USA
| | - Suraj Sharma
- Department of Textiles, Merchandising, and Interiors, University of Georgia, 305 Sanford Dr., Athens, GA 30602, USA.
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Payanda Konuk O, Alsuhile AAAM, Yousefzadeh H, Ulker Z, Bozbag SE, García-González CA, Smirnova I, Erkey C. The effect of synthesis conditions and process parameters on aerogel properties. Front Chem 2023; 11:1294520. [PMID: 37937209 PMCID: PMC10627014 DOI: 10.3389/fchem.2023.1294520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 10/12/2023] [Indexed: 11/09/2023] Open
Abstract
Aerogels are remarkable nanoporous materials with unique properties such as low density, high porosity, high specific surface area, and interconnected pore networks. In addition, their ability to be synthesized from various precursors such as inorganics, organics, or hybrid, and the tunability of their properties make them very attractive for many applications such as adsorption, thermal insulation, catalysts, tissue engineering, and drug delivery. The physical and chemical properties and pore structure of aerogels are crucial in determining their application areas. Moreover, it is possible to tailor the aerogel properties to meet the specific requirements of each application. This review presents a comprehensive review of synthesis conditions and process parameters in tailoring aerogel properties. The effective parameters from the dissolution of the precursor step to the supercritical drying step, including the carbonization process for carbon aerogels, are investigated from the studies reported in the literature.
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Affiliation(s)
- Ozge Payanda Konuk
- Department of Materials Science and Engineering, Koç University, Istanbul, Türkiye
| | - Ala A. A. M. Alsuhile
- Department of Chemical and Biological Engineering, Koç University, Istanbul, Türkiye
| | - Hamed Yousefzadeh
- Department of Chemical Engineering, Yeditepe University, Atasehir, Istanbul, Türkiye
| | - Zeynep Ulker
- School of Pharmacy, Altinbas University, Istanbul, Türkiye
| | - Selmi E. Bozbag
- Department of Chemical and Biological Engineering, Koç University, Istanbul, Türkiye
| | - C. A. García-González
- Departamento de Farmacología, Farmacia Y Tecnología Farmacéutica, I+D Farma (GI-1645), Faculty of Pharmacy, Instituto de Materiales (iMATUS) and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - I. Smirnova
- Institute of Thermal Separation Processes, Hamburg University of Technology, Hamburg, Germany
| | - Can Erkey
- Department of Materials Science and Engineering, Koç University, Istanbul, Türkiye
- Department of Chemical and Biological Engineering, Koç University, Istanbul, Türkiye
- Koç University Tüpraş Energy Center (KUTEM), Koç University, Istanbul, Türkiye
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Parascanu MM, Esteban-Arranz A, de la Osa AR, Romero A, Sánchez-Silva L. Comparison of nanoclay/polyvinyl alcohol aerogels scale production: Life Cycle Assessment. Chem Eng Res Des 2021. [DOI: 10.1016/j.cherd.2021.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Pawar AA, Kim A, Kim H. Synthesis and performance evaluation of plastic waste aerogel as sustainable and reusable oil absorbent. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 288:117717. [PMID: 34261029 DOI: 10.1016/j.envpol.2021.117717] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 07/01/2021] [Accepted: 07/02/2021] [Indexed: 06/13/2023]
Abstract
Direct utilization of waste polyethylene terephthalate (PET) from the environment to form highly porous aerogel technology for oil absorption is an attractive approach from the view point of green chemistry. However, the oil absorption reaction is limited by low oil absorption capacity and less stability. For now, silica aerogel are used to solve these problem. Our goal is to substitute to these silica aerogel with PET aerogel technology. Herein, we have prepared an environmental waste PET based aerogel with 1.0:0.5 wt% PET, polyvinyl alcohol (PVA), and glutaraldehyde (GA) 0.2% v/v were dispersed in 10 mL DI water, followed by homogenization (30 min), sonication (10 min), and ageing (2 h) at 70 °C. To escape macroscopic cracking, cooling (8 h) at 4 °C was followed by freezing (6 h), freeze drying at -80 °C, and 5 mTorr for 18 h. The hybrid PET aerogel displays excellent performance towards oil absorption. Notably it showed high absorption capacity towards the different oils about 21-40 times its own weight, depending on the viscosity and density of the oil and solvents within 15-35 s, 25 °C, and 2 × 2 cm aerogel size. In addition, the aerogel shows there is no change in structure after several recycles due to high mechanical strength. Furthermore, because of the PET aerogel's high porosity (99.74%) and low density (0.0311 g/cm3), close bonding between PET-PVA occurs. Therefore, aerogel shows hydrophobic nature, good mechanical strength, high thermal stability, arrangement of the interconnected fibrillar pore network offers a high surface to volume ratio, low surface energy, high surface roughness, and more reusability. All these parameters are responsible for high oil absorption.
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Affiliation(s)
- Atul A Pawar
- Department of Energy Science and Technology, Environmental Waste Recycle Institute, Myongji University, Yongin, Gyeonggi-do, 17058, Republic of Korea
| | - Ayoung Kim
- Department of Energy Science and Technology, Environmental Waste Recycle Institute, Myongji University, Yongin, Gyeonggi-do, 17058, Republic of Korea
| | - Hern Kim
- Department of Energy Science and Technology, Environmental Waste Recycle Institute, Myongji University, Yongin, Gyeonggi-do, 17058, Republic of Korea.
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Mareev E, Minaev N, Epifanov E, Tsymbalov I, Sviridov A, Gordienko V. Time-resolved optical probing of the non-equilibrium supercritical state in molecular media under ns laser-plasma impact. OPTICS EXPRESS 2021; 29:33592-33601. [PMID: 34809169 DOI: 10.1364/oe.441690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 09/23/2021] [Indexed: 06/13/2023]
Abstract
We proposed a complex method based on a combination of shadow photography and time-resolved Raman spectroscopy to observe the non-stationary laser-induced supercritical state in molecular media. Shadow photography is applied for retrieving pressure values, while Raman spectroscopy with molecular dynamics for temperature estimation. Time resolution of 0.25 ns is achieved by varying the delay between the pump (creating an extreme energy delivery) and the probe laser pulses by the self-made digital delay electronic circuit . The proposed method was employed in liquid carbon dioxide and water. Under nanosecond laser pulse impact, the estimated temperatures and pressures (∼700 K and ∼0.5 GPa) achieved in media are higher than the critical parameters of the samples.
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