keyword
https://read.qxmd.com/read/38536967/uncovering-the-power-of-hsccc-separation-of-diastereomeric-and-regioisomeric-styrylpyrones-from-the-stem-bark-of-goniothalamus-leiocarpus
#1
JOURNAL ARTICLE
Xiao Liu, Ling-Yun Li, Zhi-Qin Zhang, Xiu-Chuan Fu, Rong-Sheng Li, Jia-Li Yao, Simon Gibbons, Qing Mu
The plant Goniothalamus leiocarpus of the Annonaceae family is used as an alternative medicine in tropical regions. Applying high-speed counter current chromatography (HSCCC), eight new bioactive styrylpyrone isomers, including 6 R ,7 S ,8 R ,2' S -goniolactone B ( 1 ), 6 S ,7 S ,8 S ,2' S -goniolactone B ( 2 ), 6 R ,7 R ,8 R ,2' S -goniolactone B ( 3 ), 6 R ,7 S ,8 S ,2' S -goniolactone C ( 4 ), 6 R ,7 S ,8 R ,2' S -goniolactone C ( 5 ), 6 S ,7 R ,8 S ,2' S -goniolactone C ( 6 ), and two positional isomers, 6 R ,7 R ,8 R ,2' S -goniolactone G ( 7 ) and 6 S ,7 R ,8 R ,2' S -goniolactone G ( 8 ), were isolated from a chloroform fraction (2...
March 27, 2024: Journal of Natural Products
https://read.qxmd.com/read/38536956/integrated-in-situ-fabrication-of-cuo-nanorod-decorated-polymer-membranes-for-the-catalytic-flow-through-reduction-of-p-nitrophenol
#2
JOURNAL ARTICLE
S Amir H Hesaraki, Oleg Prymak, Markus Heidelmann, Mathias Ulbricht, Lukas Fischer
We developed a novel method to fabricate copper nanorods in situ in a poly(ether sulfone) (15 wt %) casting solution by a sonochemical reduction of Cu2+ ions with NaBH4 . The main twist is the addition of ethanol to remove excess NaBH4 through Cu(0) catalyzed ethanolysis. This enabled the direct use of the resulting copper-containing casting dispersions for membrane preparation by liquid nonsolvent-induced phase separation and led to full utilization of the copper source, generating zero metal waste. We characterized the copper nanorods as presented in the membranes via scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and UV/vis spectroscopy...
March 27, 2024: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/38536673/synthesis-and-exploration-of-barium-stannate-zirconate-basn-1-x-zr-x-o-3-0-%C3%A2-x-%C3%A2-1-solid-solutions-as-photocatalysts
#3
JOURNAL ARTICLE
Tarek Alammar, Anja-Verena Mudring
Employing ionic liquid-assisted microwave synthesis and moderate heat treatment allows for the preparation of otherwise difficult-to-obtain perovskite-type BaSn1- x Zr x O3 solid solutions (0 ≤ x ≤ 1). The impact of substituting Sn for the crystal structure, crystallinity, morphology, and photocatalytic performance was investigated. The obtained materials are characterized by X-ray diffraction, scanning electron microscopy, Brunauer-Emmett-Teller (BET) surface area analysis, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, and Raman and IR spectroscopy...
March 27, 2024: Inorganic Chemistry
https://read.qxmd.com/read/38536667/high-temperature-electron-diffraction-on-organic-crystals-in-situ-crystal-structure-determination-of-pigment-orange-34
#4
JOURNAL ARTICLE
Yaşar Krysiak, Sergi Plana-Ruiz, Lothar Fink, Edith Alig, Ulrich Bahnmüller, Ute Kolb, Martin U Schmidt
Small molecule structures and their applications rely on good knowledge of their atomic arrangements. However, the crystal structures of these compounds and materials, which are often composed of fine crystalline domains, cannot be determined with single-crystal X-ray diffraction. Three-dimensional electron diffraction (3D ED) is already becoming a reliable method for the structure analysis of submicrometer-sized organic materials. The reduction of electron beam damage is essential for successful structure determination and often prevents the analysis of organic materials at room temperature, not to mention high temperature studies...
March 27, 2024: Journal of the American Chemical Society
https://read.qxmd.com/read/38536485/green-synthesis-of-copper-nanoparticles-by-using-pineapple-peel-waste-in-vitro-characterizations-and-antibacterial-potential
#5
JOURNAL ARTICLE
Sanchita Mitra, Tarun Kumar Dua, Serina Easmin, Sucheta Sarkar, Arijit Prosad Roy, Ranabir Sahu, Gouranga Nandi, Md Salman Haydar, Swarnendu Roy, Paramita Paul
A considerable amount of fruit waste is being produced every day worldwide. The green synthesis of metal nanoparticles from fruit peel waste can be an innovative, cost-effective, and eco-friendly alternative to traditional methods. Copper nanoparticles (CuNPs) were synthesized by a green method using the pineapple peels extract (PLX) and copper sulfate pentahydrate. The formation of CuNPs was visually identified and detected by UV-Visible spectroscopy. The CuNPs were characterized by Fourier-transform infrared (FTIR) spectroscopy, particle size analyzer, scanning electron microscopy (SEM), and X-ray diffraction (XRD)...
March 27, 2024: Bioprocess and Biosystems Engineering
https://read.qxmd.com/read/38535976/reversible-cspbbr-3-%C3%A2-cspb-2-br-5-transformation-via-reverse-micellar-aqueous-solution
#6
JOURNAL ARTICLE
Subhashree Sahu, Tushar Debnath, Kalyanasis Sahu
Lead halide perovskites suffer from water and moisture instability due to the highly ionic nature of the crystal structures, though a few groups took advantage of it for chemical transformation via water-assisted strategy. However, direct exposure of the perovskite to bulk water leads to uncontrolled chemical transformation. Here, we report a controlled chemical transformation of CsPbBr3 to CsPb2 Br5 triggered by nanoconfined water by placing CsPbBr3 in the nonpolar phase within a reverse micelle. The chemical transformation reaction is probed by using steady-state and time-resolved optical spectroscopy...
March 27, 2024: Journal of Physical Chemistry Letters
https://read.qxmd.com/read/38535754/structure-and-morphology-of-red-pigments-based-on-sepiolite
#7
JOURNAL ARTICLE
I Carrillo, E Atanes-Sánchez, F Fernández-Martínez
Sepiolite is an important raw fibrous material. A method to prepare red pigments based on sepiolite through the thermal treatment of sepiolite with sulfur and sodium sulfide hydrate is reported. Sepiolite was heated until 800 °C in order to remove zeolitic water, the first coordinated water, the second coordinated water, and structural hydroxyls. Several [S/Na2 S]molar ratios in the range 0.5-7 were employed. The properties of these pigments were studied by different analytical techniques, such as colorimetric analysis, thermal analysis, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction and scanning electron microscopy...
March 27, 2024: Dalton Transactions: An International Journal of Inorganic Chemistry
https://read.qxmd.com/read/38535689/cobalt-ferrite-nanorods-synthesized-with-a-facile-green-method-in-a-magnetic-field
#8
JOURNAL ARTICLE
Alexander L Kwiatkowski, Petr V Shvets, Ivan S Timchenko, Darya E Kessel, Elizaveta D Shipkova, Konstantin I Maslakov, Ivan A Kuznetsov, Dmitry A Muravlev, Olga E Philippova, Andrey V Shibaev
We report a new facile method for the synthesis of prolate cobalt ferrite nanoparticles without additional stabilizers, which involves a co-precipitation reaction of Fe3+ and Co2+ ions in a static magnetic field. The magnetic field is demonstrated to be a key factor for the 1D growth of cobalt ferrite nanocrystals in the synthesis. Transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy are applied to characterize the morphology and structure of the obtained nanoparticles. According to TEM, they represent nanorods with a mean length of 25 nm and a diameter of 3...
March 20, 2024: Nanomaterials
https://read.qxmd.com/read/38535688/the-influence-of-machining-conditions-on-the-orientation-of-nanocrystallites-and-anisotropy-of-physical-and-mechanical-properties-of-flexible-graphite-foils
#9
JOURNAL ARTICLE
Vladimir A Shulyak, Nikolai S Morozov, Andrei V Ivanov, Alexandra V Gracheva, Sergei N Chebotarev, Viktor V Avdeev
The physical and mechanical properties and structural condition of flexible graphite foils produced by processing natural graphite with nitric acid, hydrolysis, thermal expansion of graphite and subsequent rolling were studied. The processes of obtaining materials and changing their characteristics has been thoroughly described and demonstrated. The structural transformations of graphite in the manufacture of foils were studied by X-ray diffraction analysis (XRD) and transmission electron microscopy (TEM). A decrease in the average size of the coherent scattering regions (CSR) of nanocrystallites was revealed during the transition from natural graphite to thermally expanded graphite from 57...
March 19, 2024: Nanomaterials
https://read.qxmd.com/read/38535687/characterization-of-mn-5-ge-3-contacts-on-a-shallow-ge-sige-heterostructure
#10
JOURNAL ARTICLE
Troy A Hutchins-Delgado, Sadhvikas J Addamane, Ping Lu, Tzu-Ming Lu
Mn5Ge3 is a ferromagnetic phase of the Mn-Ge system that is a potential contact material for efficient spin injection and detection. Here, we investigate the creation of Mn5Ge3-based contacts on a Ge/SiGe quantum well heterostructure via solid-state synthesis. X-ray diffraction spectra fitting indicates the formation of Mn5Ge3-based contacts on bulk Ge and Ge/SiGe. High-resolution scanning transmission electron microscopy imaging and energy dispersive X-ray spectroscopy verify the correct Mn5Ge3-based phase formation...
March 19, 2024: Nanomaterials
https://read.qxmd.com/read/38535683/effect-of-deposition-working-power-on-physical-properties-of-rf-sputtered-cdte-thin-films-for-photovoltaic-applications
#11
JOURNAL ARTICLE
Ana-Maria Răduță, Ana-Maria Panaitescu, Marina Manica, Sorina Iftimie, Vlad-Andrei Antohe, Ovidiu Toma, Adrian Radu, Lucian Ion, Mirela Petruta Suchea, Ștefan Antohe
The main objective of this study was to determine the variation in the properties of cadmium telluride (CdTe) thin films deposited on a p-type Si substrate by the radio frequency magnetron sputtering technique at four different working powers (70 W, 80 W, 90 W, and 100 W). The substrate temperature, working pressure, and deposition time during the deposition process were kept constant at 220 °C, 0.46 Pa, and 30 min, respectively. To study the structural, morphological, and optical properties of the CdTe films grown under the mentioned experimental conditions, X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), and optical spectroscopy were used...
March 18, 2024: Nanomaterials
https://read.qxmd.com/read/38535663/microstructure-mechanical-property-and-thermal-conductivity-of-porous-tico-ceramic-fabricated-by-in-situ-carbothermal-reduction-of-phenolic-resin-and-titania
#12
JOURNAL ARTICLE
Xiaoyu Cao, Chenhuan Wang, Yisheng Li, Zehua Zhang, Lei Feng
The porous TiCO ceramic was synthesized through a one-step sintering method, utilizing phenolic resin, TiO2 powder, and KCl foaming agent as raw materials. Ni(NO3 )2 ·6H2 O was incorporated as a catalyst to facilitate the carbothermal reaction between the pyrolytic carbon and TiO2 powder. The influence of Ni(NO3 )2 ·6H2 O catalyst content (0, 5, 10 wt.% of the TiO2 powder) on the microstructure, compressive strength, and thermal conductivity of the resultant porous TiCO ceramic was examined. X-ray diffraction and X-ray photoelectron spectroscopy results confirmed the formation of TiC and TiO in all samples, with an increase in the peak of TiC and a decrease in that of TiO as the Ni(NO3 )2 ·6H2 O content increased from 0% to 10%...
March 13, 2024: Nanomaterials
https://read.qxmd.com/read/38535651/energy-storage-performance-of-electrode-materials-derived-from-manganese-metal-organic-frameworks
#13
JOURNAL ARTICLE
Gyeongbeom Ryoo, Seon Kyung Kim, Do Kyung Lee, Young-Jin Kim, Yoon Soo Han, Kyung-Hye Jung
Metal-organic frameworks (MOFs) are porous materials assembled using metal and organic linkers, showing a high specific surface area and a tunable pore size. Large portions of metal open sites in MOFs can be exposed to electrolyte ions, meaning they have high potential to be used as electrode materials in energy storage devices such as supercapacitors. Also, they can be easily converted into porous metal oxides by heat treatment. In this study, we obtained high energy storage performance by preparing electrode materials through applying heat treatment to manganese MOFs (Mn-MOFs) under air...
March 11, 2024: Nanomaterials
https://read.qxmd.com/read/38535647/synthesis-and-characterization-of-new-nanohybrids-based-on-carboxymethyl-scleroglucan-and-silica-nanoparticles
#14
JOURNAL ARTICLE
Rubén H Castro, Laura M Corredor, Isidro Burgos, Sebastián Llanos, Camilo A Franco, Farid B Cortés, Eduardo A Idrobo, Arnold R Romero Bohórquez
In this study, two new nanohybrids (NH-A and NH-B) were synthesized through carbodiimide-assisted coupling. The reaction was performed between carboxymethyl-scleroglucans (CMS-A and CMS-B) with different degrees of substitution and commercial amino-functionalized silica nanoparticles using 4-(dimethylamino)-pyridine (DMAP) and N,N'-dicyclohexylcarbodiimide (DCC) as catalysts. The morphology and properties of the nanohybrids were investigated by using transmission (TEM) and scanning electron microscopy (SEM), electron-dispersive scanning (EDS), attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FT-IR), X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (XRD), inductively coupled plasma atomic emission spectroscopy (ICP-OES), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and dynamic light scattering (DLS)...
March 10, 2024: Nanomaterials
https://read.qxmd.com/read/38535643/exploring-borate-modified-calcium-phosphate-ceramics-antimicrobial-potential-and-cytocompatibility-assessment
#15
JOURNAL ARTICLE
Inna V Fadeeva, Katia Barbaro, Annalisa Altigeri, Anna A Forysenkova, Marat R Gafurov, Georgy V Mamin, Alexander V Knot'ko, Viktoriya G Yankova, Anna A Zhukova, Fabrizio Russo, Julietta V Rau
Addressing periprosthetic infections, which present significant healing challenges that often require revision surgeries, necessitates the development of novel antibacterial materials and implants. Current research focuses on creating materials that hinder bacterial adhesion, colonization, and proliferation in surrounding tissues. Boron (B)-containing compounds are known for their antibacterial properties and potential in bone metabolism for regenerative medicine. In this study, we synthesized B-containing tricalcium phosphate (0...
March 9, 2024: Nanomaterials
https://read.qxmd.com/read/38535640/efficient-zinc-vanadate-homojunction-with-cadmium-nanostructures-for-photocatalytic-water-splitting-and-hydrogen-evolution
#16
JOURNAL ARTICLE
Imran Hasan, Adel El Marghany, Naaser A Y Abduh, Fahad A Alharthi
Construction of a homojunction is an effective strategy for effective charge transfer to suppress charge carrier recombination in augmented photocatalysis. The present work reveals the synthesis of homojunction formation through the reinforcement of Cd nanostructures into a solid lattice of zinc vanadate (Zn3 V2 O8 , ZnV) using the hydrothermal method. The formation of a homojunction between cadmium vanadate (CdV, Cd3 V2 O8 ) and ZnV was confirmed by various spectroscopic and electron microscopic techniques such as Fourier-transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) associated with energy-dispersive X-ray (EDX) mapping, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible spectrophotometry (UV-Vis)...
March 9, 2024: Nanomaterials
https://read.qxmd.com/read/38535630/low-platinum-content-exchange-coupled-copt-nanoalloys-with-enhanced-magnetic-properties
#17
JOURNAL ARTICLE
Georgia Basina, Vasileios Alexandrakis, Ioannis Panagiotopoulos, Dimitrios Niarchos, Eamonn Devlin, Margarit Gjoka, George C Hadjipanayis, Vasileios Tzitzios
Bimetallic colloidal CoPt nanoalloys with low platinum content were successfully synthesized following a modified polyol approach. Powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and transmission electron microscopy (TEM) studies were performed to estimate the crystal structure, morphology, and surface functionalization of the colloids, respectively, while the room-temperature magnetic properties were measured using a vibrating sample magnetometer (VSM)...
March 7, 2024: Nanomaterials
https://read.qxmd.com/read/38535459/new-phenol-derivatives-from-the-haima-cold-seep-derived-fungus-aspergillus-subversicolor-cyh-17
#18
JOURNAL ARTICLE
Yi-Hao Che, Wen-Ping Ding, Zhi-Hui Xiao, Jia-Min Wu, Hao Yin, Fa-Zuo Wang, Si Zhang
Seven new phenol derivatives, subversins A-E ( 1 - 5 ), subversic acid A ( 6 ) and epi -wortmannine G ( 7 ); one new natural product, 4-hydroxy-7-methoxyphthalide ( 8 ); and five known compounds ( 9 - 13 ) were isolated from the fungus Aspergillus subversicolor CYH-17 collected from the Haima cold seep. The structures and absolute configurations of these compounds were determined via NMR, MS, optical rotation, electronic circular dichroism (ECD) calculation, X-ray diffraction analysis and comparison with the literature...
February 29, 2024: Marine Drugs
https://read.qxmd.com/read/38535273/anti-inflammatory-antipyretic-and-analgesic-potential-of-chitin-and-chitosan-derived-from-cockroaches-periplaneta-americana-and-termites
#19
JOURNAL ARTICLE
Khushbakht Asad, Sumaira Shams, Eliana Ibáñez-Arancibia, Patricio R De Los Ríos-Escalante, Farhad Badshah, Farooq Ahmad, Muhammad Salman Khan, Asar Khan
The chitin and chitosan biopolymers are extremely valuable because of their numerous industrial and pharmacological uses. Chitin and chitosan were extracted from the exoskeleton of Periplaneta americana (cockroaches) and termites using various acid and alkali techniques. The extraction process involves an initial demineralization step, during which integument dry powder was subjected to 500 mL (2.07 mol/L) of concentrated HCl at 100 degrees Celsius for 30 min, followed by meticulous rinsing with distilled water to restore the pH to its baseline...
March 21, 2024: Journal of Functional Biomaterials
https://read.qxmd.com/read/38535248/generation-of-pearl-calcium-phosphate-composite-particles-and-their-integration-into-porous-chitosan-scaffolds-for-bone-regeneration
#20
JOURNAL ARTICLE
Zhiyi Li, Ihtesham Ur Rehman, Rebecca Shepherd, Timothy E L Douglas
Bone tissue engineering using osteoconductive scaffolds holds promise for regeneration, with pearl powder gaining interest for its bioactive qualities. This study used freeze drying to create chitosan (CS) scaffolds with pearl/calcium phosphate (p/CaP) powders, mimicking bone tissue structurally and compositionally. Characterization included scanning electron microscopy (SEM) and mechanical testing. X-ray diffraction (XRD) Fourier-transform infrared-photoacoustic photo-acoustic sampling (FTIR-PAS), and FTIR- attenuated total reflectance (FTIR-ATR) were used to characterize p/CaP...
February 21, 2024: Journal of Functional Biomaterials
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