Article
Engineering, Environmental
Lin Feng, Qingge Feng, Qihua Liang, Yuan Qi, Fanghong Qin, Kao Chen, Xiaoxiao Huang, Junyi Liu, Zhuoyan Huang
Summary: Amine-modified silica aerogel was synthesized as an efficient and environmentally friendly adsorbent for removing nanoparticles. Doping with 3-aminopropyltriethoxysilanes enhanced the adsorption capacity, making it 19 times more efficient than unmodified aerogel. The study provides a reliable adsorption approach for nanoparticle removal and investigates the intricate adsorption mechanism.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Jae Won Lee, Seok Min Hong, Ju Ho Lee, Yung Zun Cho
Summary: Hydrophobic aluminosilicate aerogels containing silver were prepared through sol-gel processes using specific solvents and treatment methods, with high silver content and low surface area. Aerogels modified with hexamethyldisilazane exhibited high iodine adsorption capacity, large surface area, and pore volume.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Energy & Fuels
Zulhelmi Alif Abd Halim, Nuha Awang, Norhayati Ahmad, Muhamad Azizi Mat Yajid
Summary: This study proposes a new method for synthesizing hydrophobic silica aerogels using rice husk-derived sodium silicate as a precursor and reducing the amount of chemical reagents required. The hydrophilic silica aerogels were produced through SCFD drying, and then surface hydrophobized using trimethylchlorosilane in n-hexane. The hydrophobic silica aerogels exhibited improved thermal stability and water repellency compared to the hydrophilic aerogels.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Chemistry, Physical
Xinyang Zhang, Zhaofeng Chen, Junxiong Zhang, Xinli Ye, Sheng Cui
Summary: Silica aerogels were successfully synthesized using TEOS and MTES as coprecursors under microwave irradiation, with the optimal molar ratio of 0.8:1:8:4. The obtained aerogels exhibited low bulk density, high surface area, and specific pore size, along with excellent superhydrophobic property.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Materials Science, Ceramics
Juan Diego Barboza-Carmona, Marianne Wenzel, Louisa Eckert, Dirk Enke, Joerg Matysik, Isaac F. Cespedes-Camacho
Summary: Silica aerogels are mesoporous materials with high specific surface areas and broad pore size distributions. Characterization of the pore structure can be done through nitrogen sorption experiments and HP Xe-129 NMR, revealing two main pore species and specific surface areas ranging from 300 to 600 m(2)/g. Condensation reactions during synthesis can result in variation of pore structure, affecting specific surface areas especially in base-catalyzed aerogels.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Yajvinder Saharan, Joginder Singh, Rohit Goyat, Ahmad Umar, Hasan Algadi, Ahmed A. Ibrahim, Raman Kumar, Sotirios Baskoutas
Summary: This article reports the synthesis, characterizations, and applications of silica, chitosan, and chitosan-silica (CS) blend aerogels. The surface of the aerogels was modified to increase their hydrophobicity and oil adsorption capability. Among the prepared aerogels, the 25% CS blend aerogel showed the highest mechanical strength, maximum porosity, high pore volume, and great surface area with extremely low bulk density and maximum oil adsorption capacity.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Green & Sustainable Science & Technology
Xiaoxing Shen, Wenfang Yang, Pu Gao, Qingyang Zhu, Bingbing Tang, Dianguang Wu, Qingyun Wang, Jiale Zhou, Yili Tong
Summary: This study utilizes supercritical carbon dioxide (scCO2) as a medium to introduce fluorine reagents onto the surface of polyvinylidene fluoride (PVDF) membranes, significantly improving their hydrophobicity and thermal stability. The results show that this modification method has great potential for developing hydrophobic surfaces and contributing to carbon neutrality.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Maryam Fashandi, Solmaz Karamikamkar, Siu. N. Leung, Hani E. Naguib, Jiang Hong, Bingqing Liang, Chul B. Park
Summary: ATMS is commonly used as a silane coupling agent and can be incorporated into aerogels with the help of PVTMS for improved properties. The use of acid and base catalysts further enhances the performance of the aerogels. Characterization methods confirm the excellent physical and chemical properties of ATMS:PVTMS aerogels.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Neha Singh, Madhu Vinjamur, Mamata Mukhopadhyay
Summary: This study provides insights into the adsorptive drug loading process in silica aerogels from supercritical CO2. A new method for accurate measurement of drug loading is presented, which yields lower results compared to the prevalent method. Both methods correlate well with the Langmuir adsorption equation.
Article
Engineering, Environmental
Bianyang He, Yaoyao Zhang, Bojie Li, Yuhan Chen, Lei Zhu
Summary: Carboxymethyl chitosan (CMCS) aerogels prepared through freeze drying technology showed excellent oil adsorption performance and stability in multiple cycles after hydrophobic modification.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Polymer Science
Mingwei Tang, Xueren Fang, Bowen Li, Meng Xu, Haiyan Wang, Shuang Cai
Summary: A facile strategy for fabricating hydrophobic and anti-fouling surfaces on wood substrates is developed in this work. The modified wood shows good hydrophobicity and anti-fouling properties, as well as UV resistance and durability against tape peel test and finger wiping.
Article
Materials Science, Ceramics
Sameera Shafi, Tahir Rasheed, Raheela Naz, Saadat Majeed, Muhammad Bilal
Summary: Aerogel technologies offer high-performance lightweight materials with unique textural characteristics. Increasing pressure significantly reduces drying time during supercritical CO2 drying, while extending the drying time does not affect the textural properties of silica aerogel.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Biochemistry & Molecular Biology
Sanosh Kunjalukkal Padmanabhan, Carmelo Protopapa, Antonio Licciulli
Summary: This study developed hydrophobic and compressible cellulose-silica composite aerogels with high compression modulus and porosity, excellent oil absorption properties, and the ability to be used multiple times without significant reduction in uptake capacity.
PROCESS BIOCHEMISTRY
(2021)
Article
Nanoscience & Nanotechnology
Jiadu Xie, Yang Wang, Hui Kang, Jinsong Cheng, Xiaoqin Shen
Summary: Ultrahigh quality factor (Q) microcavities are becoming popular compact photonic platforms for various applications. However, silica microcavities suffer from degradation of their Q value over time due to surface absorption loss. In this study, a new type of ultrahigh Q silica microcavity that effectively prevents Q degradation over time is reported. This approach enables the generation of sustainable ultralow threshold optical frequency combs in open air, making it ideal for next generation photonic applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Ting Luo, Wei-Wang Zeng, Ruidan Zhang, Chuanyao Zhou, Xueming Yang, Zefeng Ren
Summary: A simple and environmentally friendly method for hydrophobic modification on silica surfaces was proposed by grafting alkoxy groups on the surfaces via alcohol alkoxylation reaction. The modified silica surface showed a water contact angle larger than 90 degrees, indicating its potential to replace traditional surface modification processes using silane adhesives in industry.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Review
Materials Science, Multidisciplinary
Hande Gunes, Yaprak Ozbakir, S. Bengisu Barim, Hamed Yousefzadeh, Selmi E. Bozbag, Can Erkey
FRONTIERS IN MATERIALS
(2020)
Article
Chemistry, Physical
Selmi Erim Bozbag, Deniz Sanli, Barkin Ozener, Gokhan Hisar, Can Erkey
Article
Engineering, Environmental
Yaprak Ozbakir, Alexandr Jonas, Alper Kiraz, Can Erkey
Summary: Efficient utilization of light in photocatalytic chemical processes requires careful optimization of the photocatalytic reactor layout to maximize the interaction between the incident light, photocatalyst, and reactant molecules. A new type of photocatalytic flow microreactor with an integrated light guide has been developed using a hydrophobic composite aerogel monolith. This concept is scalable and shows great potential for carrying out various photocatalytic reactions in both polar and non-polar solvents.
CHEMICAL ENGINEERING JOURNAL
(2021)
Review
Chemistry, Multidisciplinary
Carlos A. Garcia-Gonzalez, Alejandro Sosnik, Jozsef Kalmar, Iolanda De Marco, Can Erkey, Angel Concheiro, Carmen Alvarez-Lorenzo
Summary: Aerogels, as the lightest solid materials on Earth, have shown great potential in drug delivery due to their high porosity and specific surface area. By tuning the aerogel structure and functionalization, site-specific, stimuli-responsive, and prolonged drug release can be achieved. This review highlights the recent advances in aerogels for drug delivery, focusing on loading efficiency, release kinetics, therapeutic demands, as well as gene therapy and life cycle assessment.
JOURNAL OF CONTROLLED RELEASE
(2021)
Article
Chemistry, Physical
H. Yousefzadeh, Selmi E. Bozbag, C. Erkey
Summary: The new technique of Supercritical Ion Exchange (SCIE) was used to synthesize Cu-MORS, demonstrating site selective ion-exchange inferred by the equilibrium isotherm. Cu-MORS showed 16% higher methanol productivity compared to Cu-MORA in the stepwise direct methane to methanol process. This highlights the importance of site selective ion-exchange for zeolite catalysis.
JOURNAL OF SUPERCRITICAL FLUIDS
(2022)
Article
Engineering, Chemical
Isik Sena Akgun, Can Erkey
Summary: The study characterized fluidization regimes for alginate aerogel particles in a Wurster fluidized bed, revealing minimum fluidization, bubbling, pneumatic, horizontal circular motion, and circulatory particle motion regimes. Factors such as particle size, batch volume, tube size, plate geometry, and gap height were found to influence the boundaries of each fluidization regime.
Article
Chemistry, Multidisciplinary
Miaotian Sun, Zeynep Ulker, Zhixing Chen, Sivaraman Deeptanshu, Monika Johannsen, Can Erkey, Pavel Gurikov
Summary: The study focuses on measuring retention factors for moderately polar solutes on different porous matrices as stationary phases using supercritical fluid chromatography. The addition of modifiers in elution processes with supercritical carbon dioxide makes the retention mechanism complex, but the development of retention models allows the obtaining of retention factors in modifier-free conditions. This information will contribute to the understanding and design of impregnation processes performed without modifiers.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Elif Demirel, Can Erkey, Nezihe Ayas
Summary: Researchers found that the KOH catalyst plays a positive role in promoting biomass decomposition, increasing gas products, and facilitating the water-gas shift reaction (WGSR) at high temperatures.
JOURNAL OF SUPERCRITICAL FLUIDS
(2021)
Article
Chemistry, Applied
Hande Gunes, Deniz Sanli Yildiz, Barkin Ozener, Gokhan Hisar, Sarshad Rommel, Mark Aindow, Selmi Erim Bozbag, Can Erkey
Summary: Pt/Al2O3 and PtPd/Al2O3 catalysts prepared via supercritical deposition method using supercritical carbon dioxide showed good catalytic activity for NO and C3H6 oxidation and C3H6-SCR reactions. Particle size and activity were affected by Pt loading and Pd addition.
Article
Energy & Fuels
H. Yousefzadeh, I. S. Akguen, S. B. Barim, T. B. Sari, G. Eris, E. Uzunlar, S. E. Bozbag, C. Erkey
Summary: Supercritical fluid reactive deposition (SFRD) is a promising process intensification technique for synthesis of a wide variety of nanostructured materials. It combines the enhanced mass transfer characteristics of supercritical fluids with high solubilities of reducing gases to achieve equipment size and time minimization. The emphasis is on supercritical CO2 (scCO2), which is non-toxic, cheap, and leaves no residue, and it has been used to synthesize various nanostructured materials.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2022)
Article
Engineering, Chemical
Isik Sena Akgun, Enis Demir, Murat Isik, Nadin Ekmekciyan, Erkan Senses, Can Erkey
Summary: Alginate aerogel particles were successfully coated with a copovidone and hydroxypropyl cellulose based polymer in a Wurster fluidized bed. The results indicate that the pores of aerogels were not damaged during the process. Changing bed temperature led to significant changes in coating thickness whereas both bed temperature and atomizing pressure affected coating layer surface morphology. The smoothest coating layer surface and the highest coating efficiency were achieved at 50 degrees C with 1.7 bar atomizing pressure.
Article
Chemistry, Physical
Phillimon Modisha, Rudaviro Garidzirai, Hande Gunes, Selmi Erim Bozbag, Sarshad Rommel, Erdal Uzunlar, Mark Aindow, Can Erkey, Dmitri Bessarabov
Summary: Pt/Al2O3 catalysts prepared using the SCD method showed the best catalytic performance for the dehydrogenation of H18-DBT, attributed to the higher dispersion of Pt particles and smaller particle size. The deactivation was mainly caused by adsorbed H0-DBT blocking the active sites. The study revealed that improved catalyst performance led to increased production of liquid by-products and carbon materials.
Article
Chemistry, Multidisciplinary
Hande Gunes, Deniz Sanli Yildiz, Huseyin Barkin Ozener, Gokhan Hisar, Selmi Erim Bozbag, Can Erkey
Summary: The study systematically investigated the effects of different platinum group metal loadings on the oxidation reactions of CO, C3H6, and NO in commercial diesel oxidation catalysts. It was found that increasing PGM loading improved the oxidation performance of CO and C3H6, but the presence and amount of Pd increased the self-inhibition of NO oxidation. NO inhibited the oxidation of CO and C3H6, but its own oxidation performance was enhanced in the presence of CO and C3H6.
TURKISH JOURNAL OF CHEMISTRY
(2021)
Review
Electrochemistry
Sansim Bengisu Barim, Erdal Uzunlar, Selmi Erim Bozbag, Can Erkey
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2020)
Article
Engineering, Environmental
Selmi Erim Bozbag, Mutlu Simsek, Onur Demir, Deniz Sanli, Barkin Ozener, Gokhan Hisar, Can Erkey
EMISSION CONTROL SCIENCE AND TECHNOLOGY
(2020)
Article
Chemistry, Physical
P. Belmonte, J. M. Garcia-Vargas, J. F. Rodriguez, I. Garrido, M. T. Garcia, M. J. Ramos
Summary: In this study, four polythiourethane films with different types of polyols and isocyanates were synthesized, characterized, and foamed. The results showed that the type of isocyanate greatly influenced the crystallinity and stiffness of the polymers, while the type of polyol modified the FT-IR spectra and the decomposition curve of the material with temperature. Furthermore, the choice of isocyanate also affected the properties of the foams obtained from the polymeric material.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Xutao Zhu, Jianguo Yan, Shouchun Liu, Fengling Zhu
Summary: This study experimentally assessed the hydrodynamic characteristics of supercritical-pressure R134a in a horizontal circular tube. It was found that the hydrodynamic characteristic curve of R134a under supercritical pressure does not have a negative-slope region but a transition region. The transition region becomes more evident with increasing heat flux, while it weakens with increasing pressure and inlet temperature. Moreover, the onset of the transition region shifts in the direction of high mass flow rate with increasing heat flux.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Stefania Mottola, Iolanda De Marco
Summary: In this study, corticosteroids were micronized with cyclodextrin using Supercritical Assisted Atomization (SAA), resulting in spherical micrometric particles with improved dissolution time.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Honghai Liu, Yu Xie, Zhilan Li, Xiaokai Zhang
Summary: This study compared the effects of supercritical carbon dioxide dewatering (SCD) and conventional kiln drying (CKD) at a temperature of 55 degrees C on the dewatering rate, moisture transfer and distribution, shrinkage, and stress characteristics of bamboo strips. The results showed that SCD had a faster dewatering rate and lower shrinkage compared to CKD, but was less effective in reducing drying stress in bamboo.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Tahmasb Hatami, Ozan N. Ciftci
Summary: This study fills the gap in previous research by establishing a hierarchy of significance for factors affecting SFE profitability, providing a deeper understanding of how technical and economic factors impact profitability. The findings highlight that the SFE facility becomes profitable when the extractor capacity surpasses 42 L.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Tingshan Guo, Chuang He, Zhiyuan Liang, Qinxin Zhao
Summary: The initial oxidation behavior of Fe10Cr and Fe20Cr alloys in supercritical H2O and supercritical CO2 with O2 has been investigated. The results show that O2 has the highest adsorption energy on FeCr alloys and reacts faster than H2O and CO2.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Vikash Chandra Roy, Jin-Seok Park, Ahmed Redwan Haque, Md Sadek Ali, Hee-Jeong Lee, Byung-Soo Chun
Summary: This research aimed to valorize brewery spent grain (BSG) using subcritical water hydrolysis (SWH) modified by six different natural deep eutectic solvents (DES) and determining their bipotentialities. The findings showed that BSG hydrolysates obtained through DES-induced SWH contained high levels of sugars, proteins, flavonoids, phenolic compounds, and essential amino acids. The hydrolysates also demonstrated antimicrobial activities, and the presence of bioactive compounds was confirmed through FT-IR analysis. This comprehensive profiling of bioactive compounds from BSG using DES-mediated SWH can contribute to the efficient valorization of BSG for industrial purposes.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Kailiang Zhang, Hanyu Wang, Tong Liu, Zhu Wang, Lvxing Wang, Ping Fan, Feng Chen, Mingqiang Zhong, Bozhen Wu, Shanqiu Liu, Jintao Yang
Summary: This study investigates the influence of foam cell structure on the electromagnetic interference shielding performance of conductive polymer composite foam. The results suggest that foamed composites exhibit improved EMI shielding performance, and bimodal cell foams have higher electric conductivity but lower EMI shielding compared to uniform cell foams.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Jaromir Valtr, Petr Roztocil, David Dasek, Radek Musalek, Frantisek Lukac, Jakub Klecka, Marek Janata, Mariana Arnoult-Ruzickova, Eva Mistova, Ludek Jelinek, Petr Sajdl, Jan Macak
Summary: This paper focuses on the design of an experimental facility for in-situ electrochemical testing at supercritical water conditions, including the design of the electrode system and surface insulation coating for electrode leads.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
Article
Chemistry, Physical
Richard Djimasbe, Mikhail A. Varfolomeev, Nailya M. Khasanova, Ameen A. Al-Muntaser, Rustam R. Davletshin, Muneer A. Suwaid, Gazinur Z. Mingazov
Summary: This study confirms the capability of supercritical water to generate active hydrogen that interacts with different fractions in unconventional feedstocks, leading to synthetic oil production during hydrothermal reactions. The findings suggest that a maximum yield of 16.78% can be achieved at a temperature of 380 oC and a reaction time of 1-12 hours.
JOURNAL OF SUPERCRITICAL FLUIDS
(2024)
