Review
Chemistry, Multidisciplinary
V. K. Ameena Shirin, Renu Sankar, Asha P. Johnson, H. V. Gangadharappa, K. Pramod
Summary: Layered double hydroxides (LDHs) are nanomaterials with high surface-to-volume ratio, suitable for drug delivery applications. Interlayered drugs can be released in a sustained manner, reducing drug administration frequency.
JOURNAL OF CONTROLLED RELEASE
(2021)
Review
Polymer Science
Hester Oosthuizen, Louise Jones, Sajid Naseem, F. J. W. J. Labuschagne, Andreas Leuteritz
Summary: Layered double hydroxides (LDHs) are functional fillers that are increasingly used in composite materials. They can be customized through metal and anion selection as well as specific processing methods, allowing for structures with desired properties. LDHs have various applications, including flame-retardants, UV stabilizers, and anti-microbial agents in polymer nanocomposites, as well as photo-absorbers in solar cells. This article provides an overview of LDH synthesis and modification, composite preparation, and characterization methods to showcase the ability for customization.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Chemistry, Physical
Szabolcs Murath, Natalie Dvornikova, Daniel Moreno-Rodriguez, Radek Novotny, Miroslav Pospisil, Martina Urbanova, Jiri Brus, Frantisek Kovanda
Summary: Anionic drugs atorvastatin and valsartan were successfully intercalated into Mg-Al LDH host with high drug loading. XRD analysis confirmed the intercalation of both drugs, while molecular modeling showed the interaction between drugs and LDH at the atomic scale. Experimental measurements supported the findings from the modeling, indicating weak electrostatic interactions between LDH layers and drug molecules. The release of the drugs from the intercalated LDH slightly differed in different media, following pseudo-second-order kinetics.
APPLIED CLAY SCIENCE
(2023)
Article
Polymer Science
Seungju Jo, Narasimharao Kitchamsetti, Hyunwoo Cho, Daewon Kim
Summary: Recently, there has been a need to explore the utilization of various heterostructures and nanocomposites for improving the electrochemical performance of supercapacitors. In this study, a novel approach using a microwave-assisted two-step synthetic route was employed to prepare a hierarchically designed flake-like morphology of the electrode material, which significantly enhanced the surface-active sites and achieved superior electrochemical properties.
Article
Materials Science, Multidisciplinary
Kexi Sun, Zihui Tang, Qiangsheng Zhao, Quan Deng, Xiujuan Wang, Haibin Tang
Summary: In this study, ZnAl-layered double hydroxide (ZnAl-LDH) nanosheets were used as an enrichment frame for surface-enhanced Raman spectroscopy (SERS) substrate to improve the detection limit of anionic pollutants. Ag nanoparticles (Ag-NPs) sputtered onto the ZnAl-LDH surface created localized electromagnetic field enhancement for SERS detection. The Ag-NPs@ZnAl-LDH composite substrates showed improved sensitivity to anionic pollutants.
Article
Materials Science, Composites
Nai-Yi Huang, Cheng-Chien Wang, Chuh-Yung Chen
Summary: By synthesizing and characterizing nanocomposite membranes of ethylene vinyl acetate (EVA) and layered double hydroxide (LDH), it was found that 12AA-LDH has better adsorption performance for CO2 than neat LDH, enhancing membrane separation performance. Additionally, 12AA-LDH shows high potential for use as an additive in CO2 capture membranes.
POLYMER COMPOSITES
(2021)
Article
Chemistry, Multidisciplinary
Alysson F. Morais, Dimy Nanclares, Ivan G. N. Silva, Alfredo Duarte, Fernando A. Garcia, Eric Breynaert, Danilo Mustafa
Summary: Synthesis of layered materials with hierarchical porosity remains challenging, but using a soft-templating strategy and introducing Eu3+ has been shown to result in the self-assembly of layered nanotubes with multilayer cylinders, greatly increasing the specific surface area of the materials.
Article
Chemistry, Inorganic & Nuclear
Luofu Min, Jingying Duan, Chuan Song, Yanan Chen, Wen Zhang, Yuxin Wang
Summary: A new and easy method is developed to remove CO32- anions from LDHs and substitute them with other desired anions. The method involves immersing LDH-CO3 in a carbonated NaCl solution, which reacts with CO32- to form bicarbonate and allows easy substitution with chloride ions.
DALTON TRANSACTIONS
(2023)
Review
Chemistry, Multidisciplinary
Ling-Xiao Zhang, Jing Hu, Ying-Bo Jia, Rui-Tian Liu, Ting Cai, Zhi Ping Xu
Summary: Layered double hydroxide (LDH) is a two-dimensional clay material with a unique structure that has shown potential for biomedical applications, with MgAl-LDH being identified as the most promising adjuvant for clinical use.
Article
Chemistry, Multidisciplinary
Haein Cho, Chan-Woo Jeon, Ba Da On, Il-Kyu Park, Sanghyeon Choi, Jingon Jang, Gunuk Wang
Summary: This study synthesized three Al-based LDHs with different divalent cations and investigated their electrical characteristics. The ZnAl-LDH junction showed distinct unipolar switching behavior with high transparency, making it a promising candidate for resistive switching devices.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Dominik Schuchardt, Sabine Rosenfeldt, Hussein Kalo, Josef Breu
Summary: By exchanging synthetic sodium-fluorohectorite with vinylbenzyltrimethylammonium chloride, the clay can be delaminated and a liquid crystalline suspension can be obtained through 1D dissolution. Crystalline nanocomposites can then be obtained by photopolymerization of wet coatings. The incorporation of modified clay into the polymer results in a material with very low oxygen and water vapor transmission rates, making it suitable for challenging packaging applications.
Article
Engineering, Environmental
Xuemei Wang, Jie Zhang, Zhen Zhang, Jing Ru, Yuan Ma, Jingwei Liu, Xinzhen Du, Xiaoquan Lu
Summary: In this study, polystyrene grafted hollow layered double hydroxides (NiCo-LDH@PS) were prepared and used as solid-phase micro-extraction (SPME) coating for the rapid detection of polycyclic aromatic hydrocarbons (PAHs) in combination with high performance liquid chromatography (HPLC). The NiCo-LDH@PS-coated SPME fiber showed enhanced adsorption capacity for seven PAHs and required only a small amount of adsorbent. The study demonstrated the great application potential of the hollow core-shell structured NiCo-LDH@PS as an SPME composite coating in adsorption and separation field.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Mingzhe Dong, Qinglong Luo, Jun Li, Kaiyuan Shi, Zhijian Wu, Jie Tang
Summary: Porous MgAl-layered double hydroxides (MgAl-LDHs) were synthesized by a sol-gel method and converted into LiAl-LDHs through a dissolution and recrystallization process. Both MgAl-LDHs and LiAl-LDHs showed high adsorption capacity and are promising for scalable lithium extraction from salt-lake brines.
MINERALS ENGINEERING
(2023)
Article
Engineering, Environmental
Liang Cai, Yuze Zhang, Xiaowu Peng, Fan Guo, Lianmin Ji, Lijuan Li
Summary: In this study, GA-LDH material was synthesized for borate acid adsorption and achieved a high adsorption capacity under optimized conditions, showing better adsorption performance compared to conventional materials. The research on adsorption mechanism and thermodynamics revealed the complex reaction process of boron adsorption by GA-LDH.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Chemistry, Physical
Sadegh Askari, Davide Mariotti, Paul Brunet, Alexander Vahl, Jan Benedikt
Summary: The hybrid Zn-air and Zn-M battery with Fe-doped Ni double hydroxide nanoflakes and activated carbon cathode material shows superior performance, high energy density, exceptional energy conversion efficiency, and outstanding power density. It also enables high-rate charging due to rapid redox reaction kinetics and excellent cathode materials catalytic activity.
MATERIALS TODAY ENERGY
(2021)
Article
Engineering, Chemical
H. Moustafa, N. A. Darwish, A. M. Youssef
Summary: The study investigated the effects of multi-walled carbon nanotubes coated with two resins on the properties of natural rubber/nylon 66 systems. Results showed that the use of 1.5 wt.% CNTs coated by R1 resin significantly improved the performance of the nanocomposites, particularly in terms of adhesion strength.
JOURNAL OF ADHESION
(2021)
Article
Materials Science, Composites
Abd El-Aziz A. El-Wakil, Hesham Moustafa, Ahmed M. Youssef
Summary: This study investigated the usage of tea tree oil and rice bran as solid carriers for achieving sustained release and high antimicrobial efficiency in polyethylene films. The addition of treated rice bran and tea tree oil significantly improved the barrier properties and thermal stability of the composite materials, as well as enhanced their biodegradability and antimicrobial properties.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2022)
Article
Engineering, Environmental
Hoda S. El-Sayed, Samah M. El-Sayed, Ahmed M. M. Mabrouk, Galal A. Nawwar, Ahmed M. Youssef
Summary: The study evaluated the efficiency of novel antimicrobial edible coatings based on chitosan, sodium alginate, and carboxymethyl cellulose for preserving soft cheese, showing that these coatings have antimicrobial effects, extending the shelf life of cheese, and maintaining high probiotic counts.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2021)
Review
Engineering, Chemical
Mahmoud Essam Abd El-Aziz, Dina M. Salama, Samir M. M. Morsi, Ahmed M. Youssef, Mohamed El-Sakhawy
Summary: This review paper provides insights into the methods used to solve the problem of fertilizer wastage during irrigation, focusing on the effectiveness of slow or controlled-release fertilizers and their related technologies and applications.
REVIEWS IN CHEMICAL ENGINEERING
(2022)
Article
Engineering, Chemical
Samir M. M. Morsi, Ahmed M. Youssef, Kholod H. Kamal, Mahmoud E. Abd El-Aziz
Summary: Smart polymeric matrices based on 2-vinyl pyridine and three different crosslinkers demonstrated superior absorption capacity for tramadol. The polymers prepared by the imprinting technique showed higher absorption of tramadol molecules than those prepared conventionally. The materials constructed from trimethylolpropane trimethacrylate achieved the highest absorption capacity, regardless of the preparation method. Furthermore, loaded imprinted polymers released more tramadol in all media, with the release being most rapid in acidic conditions.
POLYMER ENGINEERING AND SCIENCE
(2022)
Review
Polymer Science
Viktoria Hornok
Summary: This paper summarizes the research results on serum albumin-based nanoparticles for drug delivery purposes, focusing on their preparation techniques, synthesis parameters, and successful clinical applications. Despite promising possibilities, products made from different types of albumin nanoparticles, with the exception of a few, have not been invented yet. The paper also discusses promising applications of serum albumin nanoparticles for various biomedical purposes, such as carriers, delivery systems, and contrast agents.
Article
Pharmacology & Pharmacy
Katalin Kristo, Szilvia Modra, Viktoria Hornok, Karoly Suvegh, Krisztina Ludasi, Zoltan Aigner, Andras Kelemen, Tamas Sovany, Klara Pintye-Hodi, Geza Regdon Jr
Summary: This study focused on preparing chitosan films containing ascorbic acid and optimizing their composition to investigate the important properties and structures for applicability. The results showed that ascorbic acid can function as a permeation enhancer in mucoadhesive films and its applicability was confirmed.
Article
Food Science & Technology
Samah M. El-Sayed, Hoda S. El-Sayed, Hanaa M. Elgamily, Ahmed M. Youssef
Summary: This study aims to produce yogurt fortified with probiotics jelly candy and evaluate its antimicrobial efficacy. The results showed that the combination of probiotics with red grape seed extract nanoemulsion enhanced the antimicrobial action. The probiotics remained at high levels in the jelly candy after exposure to simulated gastrointestinal solutions. The fortified yogurt maintained good chemical and sensory properties during storage.
JOURNAL OF FOOD PROCESSING AND PRESERVATION
(2022)
Article
Chemistry, Multidisciplinary
Lukasz Lamch, Kazimiera A. Wilk, Imre Dekany, Agota Deak, Viktoria Hornok, Laszlo Janovak
Summary: The encapsulation of hydrophilic and amphiphilic drugs in colloidal carrier systems for sustained release is a growing concern. The use of a core-shell approach with nanocarriers can provide a solution for hydrophilic/amphiphilic drugs. Amphiphilic polymers play a key role in stabilizing the system and enhancing the chemical stability and sustained release profiles.
Article
Materials Science, Composites
Ahmad M. Youssef, Mahmoud E. Abd El-Aziz, Ragab E. Abouzeid
Summary: This research investigates the effects of unmodified, soda treated, and oxidized bagasse fibers on the properties of recycled polyvinyl chloride composites. It finds that the uniform distribution of bagasse fibers in the polymer composites is a key factor affecting the mechanical properties. The oxidized bagasse fiber loaded composites demonstrate the best mechanical and biodegradation properties.
POLYMER COMPOSITES
(2022)
Article
Energy & Fuels
Hesham Moustafa, Hanaa E. Nasr, Ahmed M. Youssef
Summary: Infectious diseases caused by bacteria in skin wounds are a significant issue that delays wound healing. The use of wound dressings made from renewable polymers and natural essential oils can overcome these problems. In this study, wound dressings were prepared using carboxymethyl cellulose (CMC)/quaternized starch (MS-Q188) and antimicrobial cinnamon essential oil (CIEO) nanoemulsion. The resulting bionanocomposites were evaluated for their properties. The bionanocomposites showed good tensile properties, but the addition of CIEO nanoemulsion affected their hydrophilicity and barrier properties. Cytotoxicity assays showed that the bionanocomposites were not toxic to cells. The inhibitory effects of CIEO nanoemulsion on various pathogenic microbes were also confirmed.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Biophysics
Viktoria Hornok, Keristina Wagdi K. Amin, Alexandra N. Kovacs, Adam Juhasz, Gabor Katona, Gyorgy T. Balogh, Edit Csapo
Summary: The encapsulation possibilities of two neuroprotective drugs, KYNA and SzR72, in BSA nanoparticles were studied to enhance their permeability through the blood-brain barrier. Various preparation conditions were tested, and it was found that successful encapsulation could only be achieved when the drugs were added to pre-prepared BSA nanoparticles. Adjusting the pH to 4.0 increased drug loading and caused significant structural changes, indicating drug insertion into the hydrophobic pockets of BSA. In vitro permeability tests showed three- to fourfold higher BBB penetration for encapsulated KYNA compared to the unformatted drug.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2022)
Article
Pharmacology & Pharmacy
Keristina Wagdi K. Amin, Mohamed M. Abdelghafour, Viktoria Hornok, Tamas Kiss, Diana Szabo, Laszlo Rovo, Laszlo Janovak
Summary: In this study, a stable and targeted polymeric drug delivery system with good magnetic response was developed. The system can encapsulate therapeutic agents with hydroxyl and/or amino functional groups. The release experiments showed that the free drug had a rapid release profile, while the conjugated drug had a prolonged release profile. The use of magnetic nanoparticles and PVA-SA can enable precise targeting and control of release rate, reducing unwanted side effects.
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Ahmed M. Youssef, Hoda S. El-Sayed, Islam EL-Nagar, Samah M. El-Sayed
Summary: This study prepared a new bionanocomposite based on CMC, AG, GL, GE, and TiO2-NPs, and evaluated their effectiveness in preserving fresh Nile tilapia fish fillets.
Article
Chemistry, Multidisciplinary
Maha Sultan, Omaima M. Hafez, Malaka A. Saleh, Ahmed M. Youssef
Summary: Smart edible coating films, specifically chitosan-beeswax based film with added pollen grains, showed good physical and mechanical properties for preserving Le Conte pears postharvest. These films exhibited improved water resistance and lower WVTR values, while also increasing stiffness. Overall, the coated fruits successfully demonstrated reduced weight loss, decay, and softening rates, indicating the effectiveness of chitosan-beeswax/pollen grains as a safe and efficient coating for fruit preservation.
Article
Chemistry, Physical
Nadine J. Kanik, Artur Kuligiewicz, Jeffrey T. Cullen
Summary: This study examined the effects of different pre-treatments on the structural H-isotope composition of clay minerals. The results showed that different pre-treatments had varied impacts on different clay minerals, and the choice of pre-treatment should be based on the specific properties and mineralogy of the samples.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Lorenzo Lisuzzo, Giuseppe Cavallaro, Stefana Milioto, Giuseppe Lazzara
Summary: This study proposes Pickering emulsions based on wax and halloysite clay nanotubes for coating silk sutures to increase their loading capacity towards eosin. The presence of halloysite/wax microspheres on the surface of silk sutures has also been explored for controlled release of hydrophobic drugs. The influence of the coating on the thermal and mechanical properties of the sutures has been studied using various techniques. In conclusion, the wax/halloysite Pickering emulsions can successfully generate hydrophobic microdomains on the surface of silk sutures, leading to enhanced flexibility and improved loading capacity towards eosin.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Bruna F. Alves, Rita C. P. Nunes, Luiz C. Bertolino, Elizabete F. Lucas
Summary: Operational problems in the oil industry caused by the precipitation of paraffins can be prevented by using polymeric additives. This article evaluates the use of polymeric nanocomposites as pour point reducers in different types of crude oil and finds that they are more efficient than pure poly(ethylene-covinyl acetate) (EVA) in reducing the pour point. The nanocomposites also modify the wax crystals and reduce the viscosity of the oil samples.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
K. A. Daniels, C. C. Graham, A. C. Wiseall, J. F. Harrington, P. Sellin
Summary: Geological storage with clay buffer is widely preferred for removing hazardous radioactive waste. The impact of fluid salinity and void space on the swelling behavior of barrier bentonites was examined through experiments. The findings suggest that clay swelling is suppressed at higher salinities, which affects the void-filling process.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
N. Werling, A. Kuligiewicz, A. Steudel, R. Schuhmann, F. Dehn, K. Emmerich
Summary: Thermal treatment of clay minerals can be used to produce building materials and environmentally friendly binders. This process involves dehydration, dehydroxylation, breakdown of structure, and recrystallization of high temperature phases. Rehydration and rehydroxylation are important factors to consider for geopolymers and SCM.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Xuan Wang, Hao Ding, Zhuoqun Xu, Jianmeng Zhang, Yanbin Yao
Summary: Rutile nano-TiO2 was loaded onto the surface of sericite to prepare sericite-rutile composite particles, which were then modified with HDTMS and sprayed onto the substrates to form sericite-rutile/HDTMS composite coatings with UV shielding and superhydrophobic self-cleaning properties. The coating exhibited good UV shielding rate and remained superhydrophobic after UV irradiation. The hierarchical structure of the sericite-rutile composite and the low surface energy of HDTMS contributed to the superhydrophobicity and UV shielding effect of the coating.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Kailang Sun, Taojun Zhang, Jie Zhou, Yonghong Liu, Minfeng Zeng, Zhen Yang, Ruokun Feng, Xiaorong Ren, Peng Zhang, Baoyi Wang, Xingzhong Cao
Summary: Chitosan-Pd0 nano particles encapsulated in Al, Co-pillared montmorillonite nanocomposites were successfully synthesized using a facile one-pot heat treatment method. The Al, Co pillaring effectively expanded the surface area and generated numerous mesopores in the interlayer space of the MMt. The resultant nanocomposite exhibited similar high comprehensive catalytic performances as the one prepared by the regular divided-multistep method. The encapsulation of CS chains and doping of Co in the Al pillaring also contributed to the improved catalytic performance.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Nathalie Fagel, Isabel Israde-Alcantara, Reza Safaierad, Marttiina Rantala, Sabine Schmidt, Gilles Lepoint, Pierre Pellenard, Nadine Mattielli, Sarah Metcalfe
Summary: Environmental conditions significantly influence clay minerals, and studying clay sediments in tropical lakes can provide valuable insights into past environmental conditions. In this study, multiproxy records from sediment cores of three crater lakes in central Mexico were analyzed. The results showed that disordered kaolinite, formed through hydrolysis and hydrothermal alteration, was the predominant mineral in the sediments. The abundance of kaolinite varied in relation to organic carbon and organic matter-related elements, and showed opposite trends with lithogenic elements. Geochemical data suggested that the increase in kaolinite abundance is linked to the formation of organo-mineral aggregates and lake level changes in closed basins.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
M. J. Martin-Alfonso, A. Mejia, F. J. Martinez-Boza, P. Partal
Summary: The drilling industry is facing new challenges to develop eco-friendlier drilling fluids. Organic modified sepiolite dispersed in oil can be an excellent additive with suitable rheological properties. This study investigated the effect of alkyl ammonium modifiers on the microstructure and rheological properties of sepiolite-vegetable oil dispersions under high-temperature and high-pressure conditions.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Weiquan Zhan, Siyuan Yang, Shenxu Bao, Liuyi Ren, Cheng Liu
Summary: The interaction between talc and the depressor CMC was investigated through molecular dynamics simulation and density functional theory calculation. It was found that CMC showed stronger adsorption on the edge plane of talc due to enhanced interactions with polar groups and water molecules. The study also revealed specific interactions between H atoms in CMC and O atoms in the edge plane, as well as between O atoms in CMC and Si, Mg atoms in the edge plane. Hydration shells on the basal and edge planes of talc were examined to explain the phenomenon.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Pierre Dramou, Yiyang Sun, Xu Ni, Fangqi Wang, Hua He
Summary: In this study, a magnetic nanocomposite was prepared and used for the separation of rutin from real samples through magnetic solid phase extraction (MSPE). The nanocomposite exhibited high specific surface area, chemical and thermal stability, water solubility, and easy separation in aqueous solution. Characterization and experiments confirmed the successful synthesis and efficient enrichment ability of the nanocomposite.
APPLIED CLAY SCIENCE
(2024)
