Article
Chemistry, Multidisciplinary
Elizabeth A. K. Wilson, Prashant Kumar, Douglas G. Montjoy, Nicholas A. Kotov
Summary: Liquid and supercritical CO2 have high solubility limits for hydrocarbons and can be used as green hydrophobic solvents. However, dispersing hydrophilic particles in CO2 is challenging due to their tendency to aggregate, limiting their surface area and catalytic efficiency. This study shows that hydrophilic semiconductor particles can be effectively dispersed in a liquid CO2 mixture with acetonitrile (ACN) by preventing aggregation using surface corrugation. Geometrically complex particles with nanoscale spikes disperse and remain suspended longer in liquid CO2 compared to other particles. The results highlight the need for further research to understand the wetting behavior of hydrophilic particles in high-pressure nonpolar environments.
Article
Materials Science, Multidisciplinary
Pawan Kumar, Nisha, Prosenjit Sarkar, Sachin Singh, B. C. K. Mishra, Ram S. Katiyar
Summary: ZnO thin films were deposited on ITO coated glass substrate using the pulsed laser deposition technique at different annealing temperatures. The topological structure and optical properties of the films were affected by the post-annealing process, as confirmed by AFM and UV-Vis spectroscopy. Raman spectroscopy and XRD were used to confirm the presence of ZnO material. Surface roughness was slightly affected by annealing temperature. The calculated optical bandgap showed a decrease and then an increase with increasing annealing temperatures. The surface roughness of the ZnO thin films was associated with variations in the optical bandgap, suggesting the significant impact of post-growth annealing.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Abdelbaki Hacini, Ahmad Hadi Ali, Nurul Nadia Adnan
Summary: The structural, optical, and surface properties of indium tin oxide (ITO) thin films deposited by RF magnetron sputtering were investigated in this study. It was found that deposition time affects the crystalline size, surface roughness, optical transmittance, band gap, and refractive index of the ITO thin films. The thickness, elemental concentration, and controllability of the ITO thin films were also discussed in relation to deposition time.
Article
Physics, Multidisciplinary
M. M. Makhlouf, M. U. Farooq, Nahla N. Ataalla, Mohamed B. Afifi
Summary: The thin films of VOTPP have nanostructure with intense Soret band in the absorption spectrum, which could be utilized as promising absorbing layers in energy conversion devices. The optical band gap values and other dispersion parameters were determined for VOTPP films, showing indirect allowed electronic transitions.
Article
Spectroscopy
Smita Verma, Velayutham Ravichandiran, Nihar Ranjan
Summary: A selective fluorescence sensor for carbonate ions has been developed in this study, which can rapidly detect low concentrations of carbonate ions. Experimental results demonstrate direct interaction between the sensor and carbonate ions, with potential implications for disease prevention and toxicity assessment.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Materials Science, Multidisciplinary
Praveen Dhangada, Smita Survase, Madhavi Thakurdesai, Nishant Tayade, M. P. Tirpude
Summary: Swift heavy ion irradiation is a powerful method for creating nanostructures on thin films' surfaces. The localized rise in temperature and rapid energy dissipation lead to the formation of disordered or amorphous ion tracks. Increasing ion fluence and overlapping of these tracks result in surface instabilities and the formation of nanostructures.
JOURNAL OF MATERIALS RESEARCH
(2023)
Review
Chemistry, Organic
Gabriele Travagliante, Massimiliano Gaeta, Roberto Purrello, Alessandro D'Urso
Summary: Self-assembly is a powerful strategy for constructing complex supramolecules. Water-soluble porphyrinoids, which can form aggregates in aqueous media via weak non-covalent forces, are ideal paradigms to study self-assembly. Studies have shown that even achiral porphyrin aggregates can exhibit supramolecular chirality. This mini-review discusses strategies for designing and building chiral aggregates in water from achiral porphyrin monomers, with a particular focus on their chiroptical features.
CURRENT ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Qingli Zou, Yue Sun, Zhuojian Liang, Wanwan Wang, Yi-Chun Lu
Summary: Magnesium-sulfur batteries offer higher theoretical volumetric energy density and lower cost compared to lithium-sulfur batteries, but suffer from poor cycle life and low energy efficiency. By increasing polysulfide solubility with high-donor-number solvents like dimethyl sulfoxide (DMSO), the discharge capacity and sulfur overpotential can be improved, leading to higher performance and reversible cycling.
ADVANCED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Narayan Sinha, Juan-Ramon Jimenez, Bjorn Pfund, Alessandro Prescimone, Claude Piguet, Oliver S. Wenger
Summary: By combining pi-donating amido with pi-accepting pyridine coordination units in a tridentate chelate ligand, a strong nephelauxetic effect was achieved in a homoleptic Cr-III complex, shifting its luminescence to the NIR-II spectral range. This study focuses on increasing metal-ligand bond covalence to shift the ruby-like E-2 emission of Cr-III to 1067 nm at 77 K, taking a fundamentally different approach from previous ligand design strategies.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Biochemistry & Molecular Biology
Dan-Dan Ren, Xiaoyan Lu, Li-Ping Zhou, Huanghongjun Tian, Shuang Wang, Lu-Fang Ma, Dong-Sheng Li
Summary: The treatment of organic dyes in industrial wastewaters is a significant environmental concern. In this study, the degradation of the organic dye gentian violet was efficiently achieved using a specific catalyst and oxidant at room temperature, providing an effective approach for the treatment of dyeing wastewater.
Article
Chemistry, Analytical
Vicente Antonio Miron-Merida, Yadira Gonzalez-Espinosa, Mar Collado-Gonzalez, Yun Yun Gong, Yuan Guo, Francisco M. Goycoolea
Summary: The study assessed the performance of two aptamers (40 and 96 nt) in the colorimetric quantification of FB1 through an aptamer-target incubation step followed by the addition of gold nanoparticles (AuNPs) and NaCl. While MgCl2 and Tris-HCl were crucial for aptamer 96 and 40 nt, respectively, the latter was not specific for FB1. Instead, the formation of Aptamer (96 nt)-FB1-AuNP conjugates in MgCl2 exhibited stability to NaCl-induced aggregation at increasing FB1 concentrations. The application of asymmetric flow field-flow fractionation (AF4) allowed for size separation and characterization with a reduction in the limit of detection from 0.002 mu g/mL to 56 fg/mL.
Article
Chemistry, Physical
Honghui Pan, Jianyu Gong, Yanrong Zhang
Summary: A multi-layer SnOx structure was prepared via hydrothermal synthesis in the presence of n-butylamine and H2O, showing high formate Faradaic efficiency. The reduction of Sn(IV) to Sn(II) species and proton-coupled electron transfer contributed to the stability and selectivity of formate production. The reversible transformation between Sn(II) and Sn(IV) species played a key role in maintaining the reproducibility of electrocatalytic CO2 reduction.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Applied
Libi Chirug, Eden Eran Nagar, Zoya Okun, Avi Shpigelman
Summary: The study found that flavonoid compounds with a C2-C3 double bond interacted with pectin, while those without this double bond did not bind to pectin. Moreover, a pH of 2.5 significantly reduced binding, while the difference between pH 4.5 and 6.5 was small and structure-dependent.
FOOD HYDROCOLLOIDS
(2021)
Article
Environmental Sciences
J. McGinley, M. G. Healy, P. C. Ryan, P. -E. Mellander, L. Morrison, J. Harmon O'Driscoll, A. Siggins
Summary: This study investigates the adsorption characteristics of five herbicides onto raw and pyrolysed waste materials from an industrial setting. The results show that granulated activated carbon exhibits the highest herbicide removal efficiency and the adsorption process involves both physical and chemical mechanisms. The Freundlich model best describes the adsorption of herbicides onto heterogeneous surfaces.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Chemistry, Analytical
Adrian K. Davey, Zhou Li, Natalie Lefton, Branden E. Leonhardt, Alireza Pourghaderi, Stuart McElhany, Derek Popple, Chunhui Dai, Salman Kahn, Matthew N. Dods, Alex Zettl, Carlo Carraro, Roya Maboudian
Summary: An improved colorimetric CO2 sensor (ED/PSP:ZIF-8) is developed by directly incorporating phenol red into the ZIF-8 metal and linker precursor solutions and blending with ethylenediamine. This sensor exhibits enhanced colorimetric gas response compared to the previous one (PSP-ED/ZIF-8) and has high selectivity to CO2 for indoor air quality monitoring. Furthermore, it can operate effectively across a range of humidity.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Multidisciplinary
Ionela Fringu, Anca Lascu, Ana-Maria Macsim, Ion Fratilescu, Camelia Epuran, Mihaela Birdeanu, Eugenia Fagadar-Cosma
Summary: A new A(2)B(2)-type porphyrin and its platinum(II) derivative were synthesized and characterized. The platinum porphyrin was complexed with colloidal gold to form a nanomaterial. The nanomaterial showed optical detection capability for potassium salt of 1-anthraquinonsulfonic acid and has potential applications in medical research. The morphological differences and detection mechanism were investigated.
Article
Chemistry, Physical
Flavia Roxana Toma, Mihaela Ionela Birdeanu, Ion-Dragos Utu, Roxana Diana Vasiliu, Lavinia Cristina Moleriu, Liliana Porojan
Summary: The study evaluated differences in surface characteristics among layers for multi-layered high translucent and super-high translucent zirconia, as well as the influence of finishing and aging on surface characteristics and microstructure. Results showed that surface treatment (glazing or polishing) significantly impacted surface roughness and microhardness, with aging leading to increased roughness.
Article
Chemistry, Multidisciplinary
Mihaela Birdeanu, Ion Fratilescu, Camelia Epuran, Alin Constantin Murariu, Gabriel Socol, Eugenia Fagadar-Cosma
Summary: The purpose of this research is to develop novel steel coating systems for mechanical equipment used in aggressive acid conditions. Homogeneous sandwich-type layered films on the surface of steel electrodes were realized using a pseudo-binary oxide and two different porphyrin derivatives. The electrochemical measurements showed that the corrosion-resistant coating exhibited high inhibition efficiency against corrosion.
Article
Engineering, Chemical
Bogdan-Ovidiu Taranu, Eugenia Fagadar-Cosma
Summary: Hydrogen generation from electrochemical water splitting, which is considered an eco-friendly alternative energy source, has led to a search for low cost and efficient catalysts. This study investigated four free-base porphyrins as heterogeneous catalysts for the oxygen and hydrogen evolution reactions in alkaline aqueous solutions. The results revealed the rich variety of aggregates formed by the self-assembling property of porphyrin molecules in different organic solvents. The most electrocatalytically active electrodes for the oxygen and hydrogen evolution reactions were identified through experiments in different electrolyte solutions.
Article
Chemistry, Analytical
Camelia Epuran, Ion Fratilescu, Ana-Maria Macsim, Anca Lascu, Catalin Ianasi, Mihaela Birdeanu, Eugenia Fagadar-Cosma
Summary: The significant tasks of the presented research are to develop multifunctional materials that can detect and capture carbon dioxide and monitor toxic metal ions from water, contributing to a sustainable and clean environment. The study focuses on the synthesis, characterization, and utilization of a specific material's optical and emission properties to develop a novel composite material capable of adsorbing carbon dioxide and detecting Mn-2 from polluted water sources.
Article
Chemistry, Multidisciplinary
Ion Fratilescu, Anca Lascu, Bogdan Ovidiu Taranu, Camelia Epuran, Mihaela Birdeanu, Ana-Maria Macsim, Eugenia Tanasa, Eugeniu Vasile, Eugenia Fagadar-Cosma
Summary: This study synthesized a versatile mixed substituted A(3)B porphyrin and its Pt(II) complex, and fully characterized them. The compounds were found to be sensitive materials for optical and fluorescence detection of hydroquinone, as well as corrosion inhibitors for carbon-steel. Additionally, the metalated porphyrins showed excellent electrocatalytic activity for the hydrogen and oxygen evolution reactions in strong alkaline and acidic electrolyte solutions.
Article
Energy & Fuels
Bogdan-Ovidiu Taranu, Eugenia Fagadar-Cosma, Paula Sfirloaga, Maria Poienar
Summary: Researchers have identified hydrogen as a practical energy vector to meet the increasing global energy demands in a sustainable manner. The electrocatalytic properties of graphite electrodes modified with combinations of nickel phosphite and free-base porphyrins were investigated, and the sample with the highest catalytic activity was found to exhibit enhanced water-splitting performance. This study contributes an original finding to the field of water-splitting literature and presents new opportunities for improving the performance of phosphite-modified electrodes.
Article
Chemistry, Analytical
Dana Vlascici, Anca Lascu, Ion Fratilescu, Diana Anghel, Camelia Epuran, Mihaela Birdeanu, Vlad Chiriac, Eugenia Fagadar-Cosma
Summary: A new sensing material, Pt(II)-COOH-TPOPP, was synthesized and used for the preparation of an anion-selective sensor. The best composition, which contained dioctylsebacate (DOS) as a plasticizer, showed excellent linear range (5 x 10(-7)-1 x 10(-1) M) and Nernstian slope (19.73 mV/decade) for citrate detection, along with good selectivity towards interfering anions and a five-week lifetime.
Article
Biochemistry & Molecular Biology
Mihaela Birdeanu, Ion Fratilescu, Camelia Epuran, Liviu Mocanu, Catalin Ianasi, Anca Lascu, Eugenia Fagadar-Cosma
Summary: Designing appropriate materials for dye removal from waste waters is a challenge for sustainability. Three partnerships were established to develop novel adsorbents with tailored optoelectronic properties. Silica matrices, Zn3Nb2O8 oxide doped with Eu3+, and a symmetrical amino-substituted porphyrin were used. The first proposed silica material based on tetraethyl orthosilicate showed better adsorption performance than the second one containing 3-aminopropyltrimethoxysilane. The incorporation of amino-substituted porphyrin improved the optical properties and adsorption mechanisms.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Engineering, Biomedical
Liliana Porojan, Flavia Roxana Toma, Mihaela Ionela Birdeanu, Roxana Diana Vasiliu, Anamaria Matichescu
Summary: The present study aimed to assess the topographical and optical characteristics of thermoplastic dental appliance materials in relation to water sorption. The study found that surface roughness increased and optical characteristics showed some changes after water uptake. Additionally, an increase in inhomogeneity in the network structure of particles was observed at the nano-level. The evaluation of water uptake and desiccation stages showed a significant increase in the specific weight of the materials within the first 12 hours.
JOURNAL OF FUNCTIONAL BIOMATERIALS
(2023)
Review
Pharmacology & Pharmacy
Anita Ioana Visan, Rodica Cristescu
Summary: Therapeutic polysaccharide-based coatings have the potential to transform medical implants into drug delivery systems. However, further research is needed to fully understand the drug degradation/release profiles of these coatings before they can be used in clinical applications. This review paper provides a comprehensive description of the benefits and challenges of polysaccharide-based coatings, discusses the latest advances in drug delivery using different types of polysaccharide coatings, and gives recommendations for future research to accelerate the translation of polysaccharide-based drug delivery systems from the laboratory to the clinic.
Article
Chemistry, Applied
Mihaela Birdeanu, Camelia Epuran, Ion Fratilescu, Eugenia Fagadar-Cosma
Summary: Sandwich-type materials based on MnTa2O6 and porphyrins mono-and tetra-substituted with ???COOH groups were synthesized and their corrosion inhibition ability on steel was studied. The number of ???COOH anchors has an influence on the corrosion inhibition efficiency.
INDIAN JOURNAL OF CHEMICAL TECHNOLOGY
(2022)