Article
Engineering, Chemical
Sedigheh Saddat Moosavi, Amin Reza Zolghadr
Summary: The adsorption of surfactants on amorphous SiO2 surfaces can alter the solid surface structure, change the surface charge density, and lead to the separation of cationic and anionic portions near amorphous SiO2.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Environmental
Rutuben Gajera, Raj Vardhan Patel, Anshul Yadav, Pawan Kumar Labhasetwar
Summary: This study evaluated the performance of TiO2 loaded flyash chitosan composite for the adsorption of anionic dye (congo red-CR) and catatonic dye (methylene blue-MB) dyes. The acid-activated adsorbents showed higher adsorption for CR than MB dye. The PSO kinetic model and Langmuir adsorption isotherms were the best fit for the experimental results. The incorporation of TiO2 inculcated photocatalytic regeneration ability in the composite adsorbents.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Chemistry, Physical
Weigao Zhao, Yajun Zhao, Hongwei Zhang, Chenjie Hao, Peng Zhao
Summary: By modifying Fe3O4 particles with SDS and CPC, this study improved the uniformity and adsorption efficiency of the nanoparticles, resulting in increased adsorption capacities for MB and CR. Adsorption followed pseudo-second-order kinetics and Langmuir isotherm model, with possible mechanisms of electrostatic adsorption and hydrogen bonding.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Physical
Muhammad A. Abbas, Geun Jun Lee, Jin Ho Bang
Summary: Nickel-cadmium and nickel-metal hydride batteries, as well as lithium-ion intercalation materials, exhibit voltage deviations known as the memory effect. The extent of the memory effect in TiO2 is influenced by particle size, Li-ion mobility, and the type of vacancies.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Biochemistry & Molecular Biology
Martina Salzano de Luna, Francesco Greco, Raffaele Pastore, Giuseppe Mensitieri, Giovanni Filippone, Paolo Aprea, Domenico Mallamace, Francesco Mallamace, Sow-Hsin Chen
Summary: By embedding Linde Type A (LTA) zeolite particles in a crosslinked CS-based aerogel, simultaneous adsorption of cationic and anionic dyes is achieved, leading to more efficient dye removal.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Chemistry, Physical
Elia Grueso, Rosa M. Giraldez-Perez, Edyta Kuliszewska, Jesus A. Guerrero, Rafael Prado-Gotor
Summary: A new method for detecting DNA and lysozyme biomolecules was developed using gold nanoparticles, with a practical and economical approach. The method showed high sensitivity and immediate results, avoiding issues with time delays seen in previous sensor designs.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Mengjie Zhang, Mengyao Ma, Zhongmei Miao, Wencui Chai, Yijun Cao
Summary: This study employed coal-based activated carbon as electrode material and modified it with cationic surfactant CTAB and anionic surfactant SDS. The modified activated carbon named CTAB-AC and SDS-AC showed improved conductivity and charge-discharge cycle stability compared to unmodified AC. Asymmetric CDI electrodes made of CTAB-AC and SDS-AC demonstrated significantly enhanced CDI performance, increasing the capacitive deionization capacity and desalination efficiency for NaNO3 by 38.01% and 25.08%, respectively. The continuous batch CDI process was shortened by 10 cycles and the final nitrate concentration met the drinking water requirement.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Nanoscience & Nanotechnology
Yaping Song, Qiang Sun, Jiangqi Luo, Yueqi Kong, Bolin Pan, Jing Zhao, Yue Wang, Chengzhong Yu
Summary: This study reports a dual active templating strategy for the design of nanostructured silica composites with inherent antibacterial performance. By using cationic and anionic structural directing agents as dual templates, controlled release of dual active antibacterial agents is achieved, resulting in enhanced antimicrobial properties of the composites.
NANO-MICRO LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Sahana Sheshachala, Birgit Huber, Jan Schuetzke, Ralf Mikut, Tim Scharnweber, Carmen M. Dominguez, Hatice Mutlu, Christof M. Niemeyer
Summary: Microfluidic droplets are used to study and mimic biological systems. In this study, a new charged fluorosurfactant was synthesized to assemble DNA-modified silica nanoparticles at the interface of microfluidic droplets.
NANOSCALE ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
Yunfei Sun, Jiawei Sun, Miaoling Que, Lixiang Chen, Feng Chen, Bo Tang
Summary: This study successfully controlled the agglomeration degree of TiO2 nanoparticles by using graphene aerogel as a scaffold. The optimized sample showed prolonged lifetime of photoinduced electrons and significantly enhanced the density of active hydroxyl radicals. The BET area and adsorption ability were also improved after the optimization process. The optimized sample exhibited high degradation rates for rhodamine-B and phenol under both UV-light and visible-light irradiation.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Energy & Fuels
Gang Wang, Enmao Wang, Qiming Huang, Shengpeng Li
Summary: The study found that the influence of cationic surfactants on the seepage stage of coal seam water injection first decreases and then increases, while the influence of anionic surfactants shows a gradually increasing trend. Additionally, both cationic and anionic surfactants exhibit more significant wetting effects with increasing concentration. Moreover, cations have stronger adsorption to coal molecules and better water solubility than anions.
Article
Chemistry, Physical
Mudussar Ali, Muhammad Usman, Afzal Shah, Abdul Rehman
Summary: Organic dyes, particularly those with hydrophobic properties, face solubility challenges in water-based applications. This study explores the use of various anionic and cationic surfactants to enhance the solubility and stability of a cationic dye, with spectrophotometric data providing insights into partition coefficients and binding constants. Additionally, the study examines the differences between mixed micellar media and solo surfactant systems in terms of binding and partitioning abilities, highlighting the synergistic effects between cationic and anionic components.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Materials Science, Multidisciplinary
Lucia Rossi, Paula I. Villabrille, Sergio Morales-Torres, Janina A. Rosso
Summary: In this study, palladium-modified titanium dioxide powder photocatalysts were prepared using the sol-gel method. The materials were characterized and their photocatalytic activity for phenol degradation under UV and visible irradiation was tested. The optimal palladium content was determined to be 0.10% atomic Pd, achieving 100% phenol degradation under UV irradiation and 68% under visible irradiation. The immobilization of the material on glass slides using the dip-coating method was also studied, showing promising photocatalytic activity for phenol degradation using solar irradiation.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Renpeng Zhang, Zhongwei Wang, Yanlong Ma, Yu Yan, Lijie Qiao
Summary: The tribocorrosion behaviors of nickel and niobium in sodium sulfate solution were studied. The differences in behavior were found to be related to the passive film growth mechanism. Niobium had an anion diffusion dominated mechanism, while nickel had a cation diffusion dominated mechanism.
Article
Engineering, Environmental
Anastasia Nickerson, Alix E. Rodowa, David T. Adamson, Jennifer A. Field, Poonam R. Kulkarni, John J. Kornuc, Christopher P. Higgins
Summary: This study sampled and analyzed soil and groundwater from an AFFF-impacted site, finding that PFAS concentrations were generally higher at depth than near the surface. In FTA soil, zwitterionic and cationic compounds were the major components of total PFAS mass. The composition of PFAS class, chain length, and structural isomers changed with depth and distance from the FTA, suggesting in situ transformation and differential transport.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Analytical
M. Stefan, C. Leostean, D. Toloman, A. Popa, O. Pana, L. Barbu-Tudoran
Summary: CuInS2-ZnO nanocomposites were prepared using solvothermal and chemical precipitation methods. The structure, morphology, composition, and optical properties of the nanocomposites were studied. The results showed that the CuInS2-ZnO nanocomposites exhibited photocatalytic activity against Rhodamine B and the photocatalytic rate increased with the addition of ZnO nanoparticles.
ANALYTICAL LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Ameen Uddin Ammar, Maria Stefan, Sergiu Gabriel Macavei, Septimiu Tripon, Ovidiu Pana, Cristian Leostean, Ioana Dorina Vlaicu, Arpad Mihai Rostas, Emre Erdem
Summary: In this study, W-doped TiO2 nanoparticles were synthesized and used as electrode materials in supercapacitors. The structural and morphological properties of the samples were analyzed using various techniques. The defect centers in the samples were analyzed using EPR spectroscopy. The assembled supercapacitor showed promising performance, with high conductivity and specific capacitance of 25.5 F g(-1).
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Cristina Bidian, Gabriela Adriana Filip, Luminita David, Bianca Moldovan, Diana Olteanu, Simona Clichici, Maria-Cristina Olanescu-Vaida-Voevod, Cristian Leostean, Sergiu Macavei, Dana Maria Muntean, Mihai Cenariu, Adriana Albu, Ioana Baldea
Summary: The research investigated the effect of phytoreduced gold (Au-CM) and silver nanoparticles (Ag-CM) with Cornus mas fruit extract (CM) on human colorectal adenocarcinoma cells. The study evaluated the impact on cell viability, oxidative stress, cell death mechanisms, and proliferation markers. The nanoparticles induced cell death and reduced cell proliferation in tumor cells, while maintaining viability in normal cells. They also triggered apoptosis and necrosis in tumor cells and protected normal cells.
Article
Chemistry, Multidisciplinary
Izabell Craciunescu, George Marian Ispas, Alexandra Ciorita, Cristian Leostean, Erzsebet Illes, Rodica Paula Turcu
Summary: Our research focuses on the synthesis of magnetic dental composite materials that overcome the limitations of using magnetic nanoparticles in dental applications. The composites were prepared using a preparation flow containing several integrated reaction steps. We performed a thorough characterization of the dental magnetic composites to demonstrate their effectiveness in addressing each limitation. The results showed that the different components of the composites provide specific benefits in dental interventions, such as biocompatibility, antimicrobial effects, increased mechanical strength, and improved esthetics. Additionally, the magnetic properties enable innovative application approaches and help reduce dental caries and microfractures.
Article
Materials Science, Multidisciplinary
Dana Toloman, Maria Stefan, Sergiu Macavei, Lucian Barbu-Tudoran, Adriana Popa
Summary: PVDF membranes blended with different amounts of MWCNT-ZnO nanocomposites were prepared, and their structural and morphological properties were investigated. The hydrophilicity of the membrane increased with the increase of nanocomposite content, as shown by the reduced contact angle. Blending 0.5% of MWCNT-ZnO in a PVDF membrane achieved 85% removal rate of RbB under UV light irradiation. The pollutant removal occurred through the processes of adsorption and photocatalysis, improving the membrane's self-cleaning property and lifetime.
Article
Chemistry, Multidisciplinary
Cigdem Tuc Altaf, Tuluhan Olcayto Colak, Arpad Mihai Rostas, Adriana Popa, Dana Toloman, Maria Suciu, Nurdan Demirci Sankir, Mehmet Sankir
Summary: Three different morphologies of ZnO nanostructures, nanoflower (NF), nano sponge (NS), and nano urchin (NU), were successfully synthesized via a mild hydrothermal method. Annealing at different temperatures showed that ZnO NS performed significantly better in terms of degradation kinetics compared to the other morphologies. The photocatalytic activity of ZnO nanocatalysts was found to be influenced by defect structure, pore diameter, and crystallinity. The ZnO NS-800 ? nanocatalyst exhibited a rate constant of 35.6 x 10(-3) min(-1) and excellent stability after a 5-cycle photocatalytic degradation of RhB.
Article
Materials Science, Multidisciplinary
Anca Petran, Andreea Petronela Crisan, Claudia Lar, Adriana Popa, Teodora Radu, Alexandra Ciorita, Diana Bogdan, Mihaela Silion, Claudiu Filip
Summary: The oxidative polymerization of a dopamine analogue, 2-aminomethyl-3-(3,4-dihydroxyphenyl)propionamide (DL), was studied and its polymerization product, PDL, was characterized both in bulk and as a coating on TiO2 and glass substrates. Various techniques including SEM/TEM, AFM, DSC/TGA, MS-ESI(+), Zeta, ss-NMR, EPR, XPS, FT-IR, and UV-vis were used to investigate the features of PDL. Selective isotopic labeling allowed for the structural characterization of PDL and a better understanding of its polymerization mechanism. PDL exhibited fluorescence and demonstrated better antibacterial effect against Staphylococcus aureus compared to polydopamine.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Ramona-Crina Suciu, Mioara Zagrai, Adriana Popa, Dana Toloman, Camelia Berghian-Grosan, Cristian Tudoran, Maria Stefan
Summary: In this study, multi-walled carbon nanotubes (MWCNTs) were decorated with TiO2-Ag nanoparticles (MWCNT-TiO2-Ag) using a simple procedure. The TiO2-Ag nanoparticles were synthesized through functionalization with -OH and -COOH groups and a polymer-wrapping technique. Characterization techniques such as XRD, TEM, and Raman spectroscopy were used to analyze the nanocomposites, and UV-Vis investigations were performed to study their band gap energy. The photocatalytic activity of the MWCNT-TiO2-Ag nanocomposite was evaluated by examining the degradation of Allura Red (E129) aqueous solution under UV irradiation.
Article
Chemistry, Inorganic & Nuclear
Maria Stefan, Adriana Popa, Dana Toloman, Cristian Leostean, Lucian Barbu-Tudoran, Alexandra Falamas
Summary: The rapid development of industrial processes has led to surface water pollution with various organic pollutants. This paper focuses on improving the photocatalytic performance of zinc oxide (ZnO) nanoparticles by using plasmonic resonance induced by gold (Au) nanoparticles. The results show that the presence of ZnO-Au nanocomposites increases the photocatalytic degradation of Rhodamine B (RhB) and oxytetracycline (OTC) pollutants under visible light irradiation compared to ZnO NPs, thanks to the plasmonic resonance and synergetic effects of the composite nanostructures.
Article
Biochemistry & Molecular Biology
Mara Filip, Ioana Baldea, Luminita David, Bianca Moldovan, Gabriel Cristian Flontas, Sergiu Macavei, Dana Maria Muntean, Nicoleta Decea, Adrian Bogdan Tigu, Simona Valeria Clichici
Summary: The study aimed to investigate the impact of gold nanoparticles capped with Cornus sanguinea (NPCS) and mixed with a fruit extract (Vaccinum myrtillus L.-VL) on human hepatic stellate cells (LX-2) exposed to TGF-beta. The results showed that the mixture of NPCS and VL improved cell membrane damage and inflammation triggered by TGF-beta and mitigated collagen I deposition, but it increased the expression of collagen III, suggestive of a fibrogenetic effect of the hybrid material.
Article
Energy & Fuels
Ameen Uddin Ammar, Manuela Stan, Adriana Popa, Dana Toloman, Sergiu Macavei, Cristian Leostean, Alexandra Ciorita, Emre Erdem, Arpad Mihai Rostas
Summary: In this study, nanosized Mn-doped WO3-based materials were used as electrode materials for high-performance supercapacitor devices. The defect structure of WO3 was improved by using various Mn concentrations, leading to enhanced electrical properties. Characterization techniques such as EPR and PL spectroscopy revealed the effect of Mn-doping on the defect structure and optical properties of WO3. The presence of Mn4+ ions and oxygen vacancies strongly influenced the electrochemical performance of the electrode material in symmetric supercapacitors.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Polymer Science
Adriana Popa, Maria Stefan, Sergiu Macavei, Ioana Perhaita, Lucian Barbu Tudoran, Dana Toloman
Summary: In this study, CoFe2O4-PVDF and CoFe2O4-ZnO-PVDF hybrid membranes were prepared using a modified phase inversion method with the application of a magnetic field. The addition of nanomaterials improved the hydrophilicity properties of the PVDF membrane and significantly influenced its intrinsic properties.