| 1. |
- Abdelhamid, Hani Nasser
(författare)
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Zinc hydroxide nitrate nanosheets conversion into hierarchical zeolitic imidazolate frameworks nanocomposite and their application for CO2 sorption
- 2020
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Ingår i: Materials Today Chemistry. - : Elsevier BV. - 2468-5194. ; 15
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Tidskriftsartikel (refereegranskat)abstract
- Hierarchical porous zeolitic imidazolate frameworks (HZIFs) are promising materials for several applications, including adsorption, separation, and nanomedicine. Herein, the conversion of zinc hydroxide nitrate nanosheets into HZIF-8 nanocomposite with graphene oxide (GO) and magnetic nanoparticles (MNPs) is reported. The conversion takes place at room temperature in water. This approach has been successfully applied for the formation of leaf-like ZIF(ZIF-L), and their nanocomposites with nanoparticles, such as GO and MNPs. This method offers a simple approach for the synthesis of tunable pore structure using nanoparticles and fast room temperature conversion (30 min) without any visible residual impurities of zinc hydroxide nitrates. The applications of HZIF-8, ZIF-L, and their nanocomposites, for CO2 sorption, exhibit excellent adsorption properties. The synthesized composites exhibit enhanced CO2 adsorption capacity due to the synergistic effect between nanoparticles (GO, or MNPs), and ZIF-8. The materials have good potential for further applications.
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| 2. |
- Alinejadian, Navid, et al.
(författare)
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Importance of the micro-lattice structure of selective laser melting processed Mo/Mo(x)S(x+1) composite : Corrosion studies on the electrochemical performance in aqueous solutions
- 2022
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Ingår i: Materials Today Chemistry. - : Elsevier BV. - 2468-5194. ; 26
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Tidskriftsartikel (refereegranskat)abstract
- Selective laser melting (SLM) based processing of Mo-based samples is challenging due to solidification cracking. We here demonstrate that the addition of 2 wt% MoS2 to the Mo feedstock markedly improves crack mitigation of SLM-processed Mo/MoS2/Mo2S3 composite micro-lattice structures (SLM-Mo/ Mo(x)S(x+1)). Crack inhibition is suggested to be a result of Mo2S3 formation, decreased lattice strain (0.04 4%), and a decrease in accumulated residual stresses. The increased values of polarization resistance from 42.3 and 19.2 kU cm2 to 437 and 78.2 kU cm2, respectively verified the hindering effect of the composition on stress corrosion cracking (SCC) and surface oxidation cracking. However, an increased corrosion current density, from 1.22 to 10.2 mA/cm2, and cathodic Tafel constant, from 175 to 260.5 mV, confirmed the decreased polarization resistance and occurrence of different types of corrosion such as SCC and pitting. The strategy to add 2 wt% MoS2 to the Mo feedstock enables the fabrication of hightemperature micro-lattice structure components with improved corrosion resistance properties applicable in e.g., electronic, power semiconductor heat sinks, offshore-, aerospace-, defense-, or particularly novel sodium-ion energy storage applications.
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| 3. |
- Ansarian, Zahra, et al.
(författare)
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Titanium germanium carbide MAX phase electrocatalysts for supercapacitors and alkaline water electrolysis processes
- 2023
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Ingår i: Materials Today Chemistry. - : Elsevier BV. - 2468-5194. ; 33
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Tidskriftsartikel (refereegranskat)abstract
- Developing electrochemically active, stable, and low-cost electrocatalysts for electrochemical devices is a significant breakthrough. Accordingly, MAX phases, emerging three-dimensional materials, are considered outstanding candidates due to their excellent electrocatalytic and electrochemical properties. Herein, the titanium germanium carbide (Ti3GeC2) MAX phase with a layered structure manufactured through reactive sintering was regarded as the electrocatalyst. In the current work, the electrocatalytic activity of the Ti3GeC2 was investigated for electrochemical devices. It was observed that adding activated carbon to the Ti3GeC2 enhances the conductivity and active area, leading to an excellent specific capacitance (349 Fg-1) for supercapacitors. Also, the capacitance of Ti3GeC2 was increased by increasing the number of cyclic voltammetry cycles. In another application, Ti3GeC2 showed substantial activity for hydrogen and oxygen evolution reactions in alkaline media. As a result, the alkaline water electrolysis system using Ti3GeC2 showed the highest current density of 10 mA cm−2 at 1.36 V and outstanding stability over 400 cycles.
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| 4. |
- Bericat Vadell, Robert, et al.
(författare)
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Single-electron transfer reactions on surface-modified gold plasmons
- 2023
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Ingår i: Materials Today Chemistry. - : Elsevier. - 2468-5194. ; 34
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Tidskriftsartikel (refereegranskat)abstract
- Photoredox catalysis's relevance in organic synthesis research and innovation will increase in the coming decades. However, the processes rely almost exclusively on expensive noble metal complexes, most notably iridium complexes, to absorb light and transfer a single charge to a substrate or a catalyst to initiate cascade transformations. Light-triggered plasmon resonances generate a non-Fermi-Dirac energy distribution with many hot carriers that decay in similar to 1 ps. Their ultrafast relaxation makes performing single electron transfer (SET) transformations challenging. Herein, a novel photosystem is proposed based on surface-modified gold nanoparticles (aka plasmon "molecularization"), which improved charge separation and, more importantly, enabled SET reactions, expanding the portfolio of photocatalysts available for photoredox catalysis. The photosystem was made into an electrode, permitting its use in photoelectrochemical arrangements that leverage electro- and photo-chemical approaches' benefits and chemical engineering solutions, helping the synthetic chemistry efforts towards greener synthesis and synthesis of more complex structures on a scale.
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| 5. |
- Carretero Cerdan, Alba, et al.
(författare)
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One-step microwave-assisted synthesis of amino-functionalized chromium(III) terephthalate MIL-101-NH2
- 2023
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Ingår i: Materials Today Chemistry. - 2468-5194. ; 31
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Tidskriftsartikel (refereegranskat)abstract
- A single-step microwave (MW)-assisted protocol for the synthesis of MIL-101(Cr) and of MIL-101(Cr)-NH2 is described herein, based on the addition of NaF as the modulator instead of hydrofluoric acid to obtain the corresponding polymers in only 1 h with high crystallinity and yields (>70%, 0.5 g). Compared to classic solvothermal protocols (12-72 h, <30%), MW-assisted synthesis allowed shorter reaction time and improved yields, replacing N,N-dimethylformamide by water. Physicochemical properties of MIL-101(Cr)-NH2 and MIL-101(Cr) obtained through this MW-assisted procedure are more homogenous than those observed for the corresponding solvothermal counterparts, and interestingly, enhanced higher control over nanometric particle size (80-130 vs 400-1000 nm), lower polydispersity, and higher Brunauer-Emett-Teller surface area (2000-2700 vs 1800-2300 m2/g) were observed because of the better accessibility and diffusion of gases throughout the internal pores.& COPY; 2023 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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| 6. |
- Moro, Giulia, et al.
(författare)
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Amino acid modified graphene oxide for the simultaneous capture and electrochemical detection of glyphosate
- 2024
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Ingår i: Materials Today Chemistry. - 2468-5194. ; 36
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Tidskriftsartikel (refereegranskat)abstract
- Amino acid modified graphene oxide derivatives (GO-AA) are herein proposed as active materials for the capture and consequent electrochemical detection of organic pollutants in aqueous media. Glyphosate (GLY), an herbicide present in many water compartments, was chosen as benchmark species to test the effectiveness of these materials for its electroactive nature, allowing direct evidence of the capture event. L-Lysine, L-Arginine or L-Methionine were grafted on GO surface through epoxide ring opening reaction, promoting the amino acids binding and the concomitant partial reduction of GO. The synthetic process results in a charge resistance drop from 8.1 KΩ for GO to 0.8–2.1 KΩ for the various GO-AA, supporting the applicability of these materials in electrochemical sensing. The resulting GO-Lysine, GO-Arginine and GO-Methionine were exploited for GLY adsorption from water. GO-Lysine was found to have the strongest interaction with GLY, with a removal efficiency of 76 % after 1 h, which is about two-fold higher than those of granular activated carbon, the industrial benchmark adsorbent. GO-AAs outperform the pristine unmodified material also when exploited as active materials for the capturing and following electrochemical detection of GLY. GO-Lysine showed the best sensitivity and allowed the recognition of GLY in water even when present at concentration levels down to 2 μg/L. Molecular dynamics simulations confirmed that the enhanced performance of this material can be ascribed to the hydrogen bond and salt bridge interactions between Lys moieties and GLY, originated from hydrogen bond and salt bridge interactions.
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| 7. |
- Muhammad, Imran, et al.
(författare)
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3D porous sulfur-graphdiyne with splendid electrocatalytic and energy storage application
- 2023
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Ingår i: Materials Today Chemistry. - : Elsevier. - 2468-5194. ; 34
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Tidskriftsartikel (refereegranskat)abstract
- The blooming emergence of graphdiyne featuring embellished sp-hybridized carbons has been highly alluring for electrocatalysis and ion storage. Here, a porous 3D material sulfur-graphdiyne (3D-SGDY) is theoretically designed comprising butadiyne chains and sulfur as a heteroatom, owing a stable cubic skeleton and an atypical tuneable indirect bandgap. Compared to sp2-bonded carbon materials, the existence of sp-bonded carbon in 3D-SGDY tuned the direction of organic reactions leading to a single carbon product with numerous storage sites for the metal ions. Anchoring a single Cu atom in 3D-SGDY, we realize the unique Cu–C (3D-SGDY) chemical bonds exhibiting unconventional selectivity for CO2 reduction. The Cu–C bond in 3D-SGDY predominantly forms the *OCHO intermediates in lieu of *COOH and provides an active charge deportation channel during the reduction process of CO2 into CH4 product. Additionally, the porous structure reveals its astounding potential as an anode material by facilitating rapid transportation with a very low diffusion barrier of 0.06 eV and an ultrahigh capacity of 1826.4 mAhg−1 for Ca-ions. This work not only provides the 3D prototype of GDY but also administers the atomic level selectivity for CO2RR and high-performance Ca-ion batteries.
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| 8. |
- Panigrahi, P., et al.
(författare)
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Tuning the selective sensing properties of transition metal dichalcogenides (MoX2 X= Se, Te) toward sulfurrich gases
- 2022
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Ingår i: Materials Today Chemistry. - : Elsevier. - 2468-5194. ; 26
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Tidskriftsartikel (refereegranskat)abstract
- There is an urgent need for an efficient sensor to mitigate the effects of toxic pollutants possessing severe impacts on humans and the environment. Motivated by this, we investigated the selected transition metal dichalcogenides (MoX2: X = Se, Te) monolayers toward the toxic sulfur-containing gases, such as H2S and SO2. We employed density functional theory simulations in combination with nonequilibrium Green's function formalism to study the optimized geometries, binding strength, electronic structures, charge transfer mechanism, and transport (current-voltage) characteristics of MoX2 with and without H2S and SO2. Weak binding energies (<-0.30 eV) of H2S/SO2 on pristine MoX2 were enhanced by selectively substituting the latter with elements like As, Ge, and Sb at lower doping concentrations of around 2%. We find that the doped MoX2 strongly adsorbs H2S/SO2 yielding significant changes in their electronic properties, which were the fundamentals for the efficient sensing mechanism and were studied through the density of states and work function calculations. For the practical sensing applica-tions, we considered the statistical thermodynamic analysis to investigate the sensing properties of pristine and doped MoX2 monolayers under varied conditions of the temperatures and pressures. We are confident that our findings would pave the way for synthesizing sensitive and selective transition metal dichalcogenides-based nanosensor toward H2S/SO2.
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| 9. |
- Piñeiro-García, Alexis, et al.
(författare)
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Tuning the nucleophilic attack and the reductive action of glycine on graphene oxide under basic medium
- 2021
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Ingår i: Materials Today Chemistry. - : Elsevier. - 2468-5194. ; 19
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Tidskriftsartikel (refereegranskat)abstract
- Amino acids are important compounds for GO functionalization because they can improve GO properties for many applications ranging from biomedicine to depollution. However, amino acids can act as nucleophiles or as reducing agents for GO functionalization or reduction, respectively. Hence, we systematically studied the GO functionalization/reduction using glycine as a model amino acid under basic conditions at room temperature. Attenuated total reflectance–Fourier transform infrared (ATR-FTIR), X-ray photoelectron spectroscopy, and Raman spectroscopy were used to characterize the modified GO with glycine. We found that low glycine concentrations produced an epoxide ring opening reaction, whereas an increase in glycine concentration led to GO reduction. The basic medium allowed to conserve the carboxylic acid groups, whereas the GO reduction mechanism was governed by the partial hydrolysis of epoxide groups and the subsequent reduction of carboxylic acids to carbonyls. This article opens up the opportunity to study and control the conditions in which different amino acids could be used for either GO functionalization or GO reduction.
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| 10. |
- Sana, B., et al.
(författare)
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Recent development in near infrared light-responsive polymeric materials for smart drug-delivery systems
- 2022
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Ingår i: Materials Today Chemistry. - : Elsevier BV. - 2468-5194. ; 25
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Tidskriftsartikel (refereegranskat)abstract
- Stimuli-responsive drug delivery systems (DDS) may overcome the drawbacks of conventional chemotherapy for cancer treatment. In particular, light-responsive polymer-based DDS may ensure spatio and temporal control in drug delivery. In this regard, near infrared (NIR) light triggered drug nanocarriers present several advantages when compared to UV–visible light triggered nanocarriers. This review surveys the recent development on the design, synthesis, functions, and applications of NIR photo-sensitive compounds in the development of long-wavelength light-responsive nanocarriers. Diverse NIR light responsive groups such as coumarin (CM), ortho-nitrobenzyl (ONB), 2-diazo-1,2-naphthoquinone (DNQ) and spiropyran (SP) derivatives and their photo-cleavage reaction mechanisms are discussed, as well as the use of indocyanine green (ICG) and its photo-thermal application. The loading into polymeric nanocarriers of up converting nanoparticles (UCNPs) which can convert NIR light into UV or visible light is also discussed. The described DDS are classified on the basis on the photo responsive groups. In details, the behavior of different polymeric materials such as micelles, hydrogels bearing photo responsive groups linked to bioactive molecules which are released under NIR light irradiation is reviewed and discussed. A section relative to commonly used instrument setup for drug release studies by NIR light irradiation is also presented for better understanding how the light has been used to irradiate in various experimental situations.
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| 11. |
- Sharma, Pratibha, et al.
(författare)
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Light responsive chemistry – A design strategy for remodelling benzoxazine architectures towards room temperature processing
- 2024
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Ingår i: Materials Today Chemistry. - : Elsevier BV. - 2468-5194. ; 38
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Forskningsöversikt (refereegranskat)abstract
- Polybenzoxazines, a novel class of phenolic thermosetting polymers, are admired for the molecular design versatility, high service temperature, appreciable chemical resistance, and strong mechanical performance. Despite many advantages, these materials undergo ring opening polymerization at high temperature, which is the first carping issue raised by the engineers regarding their utilization in any large-scale engineering application. In this regard, benzoxazine monomers or their formulations, which can offer light triggered curing characteristics, may provide solution to impediments associated with high temperature processing. Several reports are available where a variety of light-responsive chemistries, such as vinyl polymerization, cycloaddition reactions, or thiol-ene reactions, have been utilized for developing light-curable formulations based on benzoxazine. In order to provide a landscape of these light-responsive benzoxazine architectures and their furtherance, the findings of these reports have been reviewed in the present article. Furthermore, the conclusions drawn from the reported literature have been enumerated, and the future orientations are highlighted. It is worth mentioning that the present review article will provide a vision to design novel light-curable formulations based on benzoxazine, which will be beneficial in harvesting the potential of these advanced thermosets in engineering applications.
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| 12. |
- Thakuria, Rahul, et al.
(författare)
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Breaking the mold : Rethinking defects in Pb-free vacancy ordered perovskite for enhanced CO2 reduction and supercapacitor functionality
- 2024
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Ingår i: Materials Today Chemistry. - : Elsevier. - 2468-5194. ; 36
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Tidskriftsartikel (refereegranskat)abstract
- The growth of hybrid halide perovskite single crystals has gathered significant attention due to their low trap density and fewer defects, which make them promising candidates for enhancing the performance of optoelectronic devices. However, in this work, we have explored the potential advantages of defects and vacancies in lead-free perovskites, specifically for applications in CO2 reduction and energy storage. We have synthesized vacancy-ordered lead-free perovskite single crystals, Cs3Bi2Br9 and Cs3Bi2Cl9, using a fast-cooling process before grinding them to prepare a nanocrystalline powder. This method deviating from the traditional slow cooling process, creates more defects and vacancies in these nanomaterials. Interestingly, these defects, often viewed as detrimental in most optoelectronic applications, have proven beneficial for energy storage in our study. During the fast-cooling process, C--O, C-O, and O-Bi-O bonds are formed in both halide perovskites indicating adsorption and formation of products. Therefore, these materials could be used in CO2 reduction without the use of a metal-organic framework. These bonds are found to be absent in defect-free perovskites produced by the traditional slow cooling process. Furthermore, the specific energy density of supercapacitors fabricated from these nanocrystalline materials is increased by 15-20 % compared to the traditional slow-cooling perovskite materials. This enhancement in energy density underscores the potential of these vacancy-rich perovskite materials in developing supercapacitors with better storage performance. Overall, this work shows how defects and vacancies engineering in lead-free halide perovskite's single crystal growth can be used to create new opportunities for their use in energy storage and CO2 reduction technologies.
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| 13. |
- Wang, Di, et al.
(författare)
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A strong enhancement of corrosion and wear resistance of polyurethane-based coating by chemically grafting of organosolv lignin
- 2024
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Ingår i: Materials Today Chemistry. - : Elsevier. - 2468-5194. ; 35
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Tidskriftsartikel (refereegranskat)abstract
- Corrosion and wear pose significant challenges to equipment operating in harsh environments. Thus, protective coatings are needed. Anti-corrosion and anti-wear coatings are traditionally fossil-based and often contain environmentally harmful additives. Achieving anti-corrosion and anti-wear coatings based on environmentally benign and sustainable materials is important and a significant challenge. This work focused on the development of organosolv lignin-based polyurethane (OS_lignin-PU) coatings. The coatings were synthesised and evaluated for corrosion protection using electrochemical impedance spectroscopy (EIS) and for wear properties using nanoindentation and nano scratch measurements. EIS revealed that the optimal lignin content for corrosion protection purposes in the OS_lignin-PU coatings was 15Â wt%. Moreover, addition of 15Â wt% lignin to the OS_lignin-PU coatings also enhanced their wear resistance, as evidenced by reduced thickness loss during tribometer tests. The nano scratch measurements revealed that OS_lignin-PU coatings containing 15Â wt% lignin exhibited the lowest scratch depth and friction coefficient. It is found that the developed lignin-containing coating exhibits remarkable corrosion and wear resistance, making it a promising sustainable material in various applications for pursuing sustainable development.
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