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https://read.qxmd.com/read/30896691/a-template-assisted-strategy-to-synthesize-a-dilute-coni-alloy-incorporated-into-ultramicroporous-carbon-for-high-performance-supercapacitor-application
#1
Yan Jiang, Yue Wang, Dehong Zeng, Yao Wang, Yangde Ma, Hai Wang, Xin Zhang, Xiaoping Dai
Carbon is widely studied as an electrical double-layer capacitor (EDLC) electrode material due to its high specific surface area and good electronic conductivity. However, the low capacitance and energy density limit its further commercial applications. Herein, we report a facile and novel synthesis of dilute CoNi alloy nanoparticles embedded into ultramicroporous carbon (CoNi/UMCs) via a template-assisted strategy using SBA-15 as a template. The CoNi alloy serves as not only the electron collector to decrease the conductivity during tests, but also creates CoNi oxide/oxhydroxide on the alloy surface in an alkali solution, promoting redox reactions in pseudocapacitors, enhancing the performance of supercapacitors...
March 21, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
https://read.qxmd.com/read/30889695/epsilon-poly-l-lysine-decorated-ordered-mesoporous-silica-contributes-to-the-synergistic-antifungal-effect-and-enhanced-solubility-of-a-lipophilic-drug
#2
Yiyan Song, Ping Zhu, Yuan Wu, Li Tan, Wei Wei, Songqin Liu, Qing Huang, Jin Chen
The emergence of drug-resistant fungal strains remains a severe threat for the public health, which prompts strict restrictions on the uses of antifungal drugs. However, the majority of lipophilic fungistatic agents are poorly water soluble with a low oral adsorption characteristic posing challenges for the precise prescriptions. In this study, a natural antimicrobial cationic peptide of epsilon-poly-l-lysine (EPL) decorated ordered mesoporous silica (SBA-15) was facilely prepared for the efficient loading of antifungal itraconazole (ITZ) drugs...
June 2019: Materials Science & Engineering. C, Materials for Biological Applications
https://read.qxmd.com/read/30861436/structures-and-dimensions-of-micelle-templated-nanoporous-silicas-derived-from-swollen-spherical-micelles-of-temperature-dependent-size
#3
Fuyou Ke, Jinhui Yi, Shu Zhang, Shuiqin Zhou, Peter I Ravikovitch, Michal Kruk
Subambient temperatures are employed in Pluronic-block-copolymer-templated syntheses of many large-pore silicas: SBA-15 (2-D hexagonal with cylindrical mesopores), FDU-12 (face-centered cubic with spherical mesopores), nanotubes and hollow nanospheres. Herein, the origin of a significant temperature dependence of the unit-cell parameter and pore diameter of silicas templated by swollen micelles of Pluronics under subambient conditions was elucidated. The temperature dependence of size of swollen spherical micelles of Pluronic F127 (EO106 PO70 EO106 ) in 2 M HCl solution was studied in 12-25 °C range using dynamic light scattering and was correlated with structure types, unit-cell sizes and pore sizes of silicas synthesized at four silica-precursor/Pluronic ratios with a swelling agent (toluene, ethylbenzene)...
February 19, 2019: Journal of Colloid and Interface Science
https://read.qxmd.com/read/30841489/enhancing-thermal-conductivity-and-photo-driven-thermal-energy-charging-discharging-rate-of-annealed-cmk-3-based-phase-change-material
#4
Yanfeng Chen, Cuiyin Liu, Yue Situ, Jian Liu, Hong Huang
In this work, the CMK-3 is successfully prepared with SBA-15 as the template and first annealed to 2000 °C to improve thermal conductivity. The annealed CMK-3 has a thermal conductivity of 6.981 W m-1 K-1 higher than un-annealed CMK-3. The annealed CMK-3 is used to encapsulate the RT44HC, and RT44HC/annealed CMK-3 has 10-fold of thermal conductivity and enhanced thermal stability than RT44HC. The RT44HC/annealed CMK-3 has a large melting enthalpy of 177.8 J g-1 and good thermal stability. The RT44HC/annealed CMK-3 has optical absorptive coefficient of visible range of solar spectrum, which identify seven-fold higher than RT44HC...
March 5, 2019: Nanomaterials
https://read.qxmd.com/read/30827028/elimination-of-cs-from-aquatic-systems-by-an-adsorbent-prepared-by-immobilization-of-potassium-copper-hexacyanoferrate-on-the-sba-15-surface-kinetic-thermodynamic-and-isotherm-studies
#5
Sepehr Mohammadi, Hossein Faghihian
For elimination of cesium from aqueous solutions, mesoporous SBA-15 was synthesized and employed as the support for immobilization of potassium copper hexacyanoferrate. The synthesized adsorbent was characterized by various techniques and was used for adsorption of cesium. The results indicated that its adsorption capacity was 174.80 mg/g and superior to many studied adsorbents. The adsorbent represented good selectivity in the presence of some studied co-existing. The Temkin, Redlich-Peterson, Sips, Langmuir, and Freundlich isotherm models were used to evaluate the experimental data...
March 2, 2019: Environmental Science and Pollution Research International
https://read.qxmd.com/read/30816396/pt-nanoparticles-supported-on-yco-x-fe-1-x-o-3-perovskite-oxides-highly-efficient-catalysts-for-liquid-phase-hydrogenation-of-cinnamaldehyde
#6
Yujie Xue, Huiyue Xin, Wenhui Xie, Peng Wu, Xiaohong Li
YCoxFe1-xO3 perovskite oxides were prepared using a modified sol-gel method with SBA-15 as a hard template. Pt nanoparticles supported on YCo0.3Fe0.7O3 perovskite oxides can furnish as high as 94.9% selectivity to cinnamyl alcohol at nearly full conversion, with the initial activity (TOF) reaching 15 163 h-1 for the selective hydrogenation of cinnamaldehyde.
February 28, 2019: Chemical Communications: Chem Comm
https://read.qxmd.com/read/30805997/development-and-application-of-sba-15-assisted-electromembrane-extraction-followed-by-corona-discharge-ion-mobility-spectrometry-for-the-determination-of-thiabendazole-in-fruit-juice-samples
#7
Mohammadreza Mohammadi Nilash, Fahimeh Mirzaei, Ali Reza Fakhari
In the present research, a new sample preparation method based on SBA-15 assisted electromembrane extraction coupled with corona discharge ion mobility spectrometer was developed for the determination of Thiabendazole as a model basic pesticide in fruit juice samples. In fact, the addition of SBA-15 in the supported liquid membrane in electromembrane extraction system not only can lead to enhancement of the effective surface area, but also introducing the negatively charged silanol groups into supported liquid membrane might improve migration of positively charged analytes toward the supported liquid membrane and finally into the acceptor solution...
February 25, 2019: Journal of Separation Science
https://read.qxmd.com/read/30784458/adsorption-of-single-and-mixed-haloacetonitriles-on-silica-based-porous-materials-mechanisms-and-effects-of-porous-structures
#8
Panida Prarat, Chawalit Ngamcharussrivichai, Sutha Khaodhiar, Patiparn Punyapalakul
Adsorption mechanisms and the role of different porous and crystalline structures on the removal of five haloacetonitriles (HANs) over hexagonal mesoporous silica (HMS), titanium substituted mesoporous silica (Ti-HMS), rod-shaped SBA-15 and microporous zeolite NaY were investigated. In addition, the effect of pH on adsorption mechanism and selective adsorption of five HANs individually and in an equimolar mixed solution were evaluated. The results indicated that the intraparticle diffusion rate constants of the mesoporous adsorbents were higher than that of the microporous NaY...
May 2019: Journal of Environmental Sciences (China)
https://read.qxmd.com/read/30778449/selective-synthesis-of-benzoquinones-over-cu-ii-containing-propylsalicylaldimine-functionalized-mesoporous-solid-catalysts
#9
Manickam Selvaraj, Mohammed A Assiri
The major product, 2,3,5-trimethyl-1,4-benzophenone (TMB[double bond, length as m-dash]O), was synthesised by an eco-friendly liquid-phase oxidation of 2,3,6-trimethylphenol (TMP-OH) over Cu(ii)-containing propylsalicylaldimine (CSA) functionalized mesoporous solid catalysts, namely, CSASBA-15(0.2), CSASBA-15(0.1) and CSAMCM-41(0.2), synthesized using various amounts of copper in a simple post-grafting method using different mesoporous silica materials, e.g., thick-silica walled SBA-15 and thin-silica walled MCM-41...
February 19, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
https://read.qxmd.com/read/30769888/influence-of-structure-modifying-agents-in-the-synthesis-of-zr-doped-sba-15-silica-and-their-use-as-catalysts-in-the-furfural-hydrogenation-to-obtain-high-value-added-products-through-the-meerwein-ponndorf-verley-reduction
#10
Raquel López-Asensio, Carmen Pilar Jiménez Gómez, Cristina García Sancho, Ramón Moreno-Tost, Juan Antonio Cecilia, Pedro Maireles-Torres
Zr-doped mesoporous silicas with different textural parameters have been synthesized in the presence of structure-modifying agents, and then characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N₂ adsorption-desorption at -196 °C, NH₃ thermoprogrammed desorption (NH₃⁻TPD), CO₂ thermoprogrammed desorption (CO₂⁻TPD), and X-ray photoelectron spectroscopy (XPS). These porous materials were evaluated in the furfural hydrogenation through the Meerwein-Ponndorf-Verley (MPV) reaction...
February 14, 2019: International Journal of Molecular Sciences
https://read.qxmd.com/read/30759838/straightforward-immobilization-of-phosphonic-acids-and-phosphoric-acid-esters-on-mesoporous-silica-and-their-application-in-an-asymmetric-aldol-reaction
#11
Christian Weinberger, Tatjana Heckel, Patrick Schnippering, Markus Schmitz, Anpeng Guo, Waldemar Keil, Heinrich C Marsmann, Claudia Schmidt, Michael Tiemann, René Wilhelm
The combined benefits of moisture-stable phosphonic acids and mesoporous silica materials (SBA-15 and MCM-41) as large-surface-area solid supports offer new opportunities for several applications, such as catalysis or drug delivery. We present a comprehensive study of a straightforward synthesis method via direct immobilization of several phosphonic acids and phosphoric acid esters on various mesoporous silicas in a Dean⁻Stark apparatus with toluene as the solvent. Due to the utilization of azeotropic distillation, there was no need to dry phosphonic acids, phosphoric acid esters, solvents, or silicas prior to synthesis...
February 12, 2019: Nanomaterials
https://read.qxmd.com/read/30759278/the-interaction-between-sba-15-derivative-loaded-with-ph-3-sn-ch-2-6-oh-and-human-melanoma-a375-cell-line-uptake-and-stem-phenotype-loss
#12
Danijela Maksimović-Ivanić, Mirna Bulatović, David Edeler, Christian Bensing, Igor Golić, Aleksandra Korać, Goran N Kaluđerović, Sanja Mijatović
Extraordinary progress in medicinal inorganic chemistry in the past few years led to the rational design of novel platinum compounds, as well as nonplatinum metal-based antitumor agents, including organotin compounds, whose activity is not based on unrepairable interaction with DNA. To overcome poor solubility and toxicity problems that limited the application of these compounds numerous delivering systems were used (Lila et al. in Biol Pharm Bull 37:206-211, 2014; Yue and Cao in Curr Cancer Drug Targets 16:480-488, 2016; Duan et al...
February 13, 2019: Journal of Biological Inorganic Chemistry: JBIC
https://read.qxmd.com/read/30747529/reorientation-of-deeply-cooled-water-in-mesoporous-silica-nmr-studies-of-the-pore-size-dependence
#13
Max Weigler, Martin Brodrecht, Gerd Buntkowsky, Michael Vogel
We apply 2H NMR to investigate water reorientation in mesoporous silica. Using synthesized MCM-41 and purchased SBA-15 materials, we systematically study the dependence on the pore diameter. For a characterization of the properties of the silica matrices, scanning electron microscopy and nitrogen gas adsorption are employed. To ascertain the thermodynamic behavior of the confined water, we utilize differential scanning calorimetry. The dynamical properties are analyzed in a broad temperature range from the weakly to the deeply cooled regime using a combination of 2H spin-lattice relaxation and stimulated-echo experiments...
February 12, 2019: Journal of Physical Chemistry. B
https://read.qxmd.com/read/30699919/green-waste-derived-substances-immobilized-on-sba-15-silica-surface-properties-adsorbing-and-photosensitizing-activities-towards-organic-and-inorganic-substrates
#14
Maria Laura Tummino, Maria Luisa Testa, Mery Malandrino, Roberta Gamberini, Alessandra Bianco Prevot, Giuliana Magnacca, Enzo Laurenti
Urban wastes are a potential source of environment contamination, especially when they are not properly disposed. Nowadays, researchers are finding innovative solutions for recycling and reusing wastes in order to favour a sustainable development from the viewpoint of circular economy. In this context, the lignin-like fraction of biomass derived from Green Compost is a cost-effective source of soluble Bio-Based Substances (BBS-GC), namely complex macromolecules/supramolecular aggregates characterized by adsorbing and photosensitizing properties...
January 29, 2019: Nanomaterials
https://read.qxmd.com/read/30691053/steam-reforming-of-model-bio-oil-aqueous-fraction-using-ni-cu-co-cr-sba-15-catalysts
#15
José A Calles, Alicia Carrero, Arturo J Vizcaíno, Lourdes García-Moreno, Pedro J Megía
Hydrogen obtained from biomass derivatives is considered a promising alternative to fossil fuels. The aim of this work is to test the viability of Ni-M/SBA-15 (M: Co, Cu, Cr) catalysts for the hydrogen production from bio-oil aqueous fraction reforming. Tests were performed in a fixed-bed reactor at 600 °C and atmospheric pressure. Firstly, the steam reforming (SR) of acetic acid, hydroxyacetone, furfural and phenol, as representative constituents of the bio-oil aqueous fraction, was carried out. Lower reactivity with increasing carbon number and decreasing steam-to-carbon ratio was observed...
January 25, 2019: International Journal of Molecular Sciences
https://read.qxmd.com/read/30691014/selective-adsorption-of-ch%C3%A2-n%C3%A2-on-ni-based-mof-sba-15-composite-materials
#16
Hong Liu, Wei Ding, Shaohua Lei, Xupei Tian, Fubao Zhou
Spherical SBA-15-based metal⁻organic framework (MOF) composite materials were prepared, with nickel as the metal center of MOFs. The materials were characterized via scanning electron microscopy, X-ray fluorescence analysis, X-ray powder diffraction, Fourier-transform infrared spectroscopy, and nitrogen (N₂) adsorption⁻desorption. The methane (CH₄) or N₂ high-pressure adsorption isotherms of the samples were measured and compared. The specific surface area and adsorption capacity of the composite materials were generally higher than the pristine MOFs, but were much lower than the synthesized SBA-15...
January 25, 2019: Nanomaterials
https://read.qxmd.com/read/30681679/ag-nanoparticle-decorated-ordered-mesoporous-silica-as-an-efficient-electrocatalyst-for-alkaline-water-oxidation-reaction
#17
Utpal Kayal, Bishnupad Mohanty, Piyali Bhanja, Sauvik Chatterjee, Debraj Chandra, Michikazu Hara, Bikash Kumar Jena, Asim Bhaumik
In recent years, several novel strategies for speeding up the slow kinetics of the water oxidation reaction have attracted considerable attention for generation of O2. This is particularly important from the environmental perspective. Here we report a SBA-15 type, 2D-hexagonal functionalized mesoporous organosilica material as support for small Ag nanoparticles (NPs) by grafting the silica surface with 3-aminopropyltriethoxysilane, followed by chemical impregnation of Ag NPs at its surface, to obtain a AgNPs@SBA-NH2 material...
January 25, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
https://read.qxmd.com/read/30678935/in-situ-synthesis-of-rhodium-nanoparticles-mesoporous-carbon-hybrid-via-a-novel-and-facile-nanocasting-method-for-simultaneous-determination-of-morphine-and-buprenorphine
#18
Mojtaba Jahanbakhshi
An in situ and facile nanocasting procedure has been developed to embed Rhodium nanoparticles (RhNPs) in mesoporous carbon (MC) matrix via carbonizing β-Cyclodextrin capped RhNPs (β-CDs@RhNPs) as a source of both carbon and metal, in the presence of SBA-15 as hard template. Firstly, β-CDs was used to coat and stabilize the RhNPs, and then coated RhNPs was applied as carbon source during the carbonization step. In this way, biocompatible materials are used as much as possible. The transmission electron microscopy, field emission scanning electron microscopy, Fourier transform infrared, BET surface area and X-ray diffraction devices were used to characterize the nanomaterials...
April 2019: Materials Science & Engineering. C, Materials for Biological Applications
https://read.qxmd.com/read/30672607/acetylcholinesterase-with-mesoporous-silica-covalent-immobilization-physiochemical-characterization-and-its-application-in-food-for-pesticide-detection
#19
Jeyanthi Palanivelu, Ramalingam Chidambaram
Toxic contamination of commonly consumed food products and water due to food chain vulnerability via agricultural products and commodities is a serious health hazard. This study reports on Santa Barbara Amorphous (SBA-15), a type of mesoporous silica nanoparticles, for efficient and stable acetylcholinesterase (AChE) adhesion toward detection of toxic pesticides. AChE was immobilized to the inert framework of mesoporous materials viz. SBA-15 with a proficient hydrolytic response toward acetylthiocholine. The immobilized system acts as a biosensor for the detection of pesticides, which are organophosphorus compounds in food...
January 23, 2019: Journal of Cellular Biochemistry
https://read.qxmd.com/read/30661610/real-time-cell-analysis-of-the-cytotoxicity-of-a-ph-responsive-drug-delivery-matrix-based-on-mesoporous-silica-materials-functionalized-with-ferrocenecarboxylic-acid
#20
Zhihui Xu, Ling Cai, Huijun Jiang, Yujie Wen, Luming Peng, Yuan Wu, Jin Chen
During the past decade, accumulating studies have been conducted on the mesoporous silica materials as the matrix of controlled drug-delivery, in which the complicated post-synthesis procedures are often involved with the molecular design to achieve the efficacy. In this study, a simplified drug delivery system of anti-cancer drug of doxorubicin (DOX) based on mesoporous SBA-15 functionalized with ferrocenecarboxylic acid (FCA) was constructed. Through a combination of physicochemical characterizations, the presence of FCA that was anchored inside the pore wall of amine groups grafted SBA-15 exhibits electron-accessible behavior without affecting the intactness of composite material...
March 21, 2019: Analytica Chimica Acta
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