Irreversible deactivation of hollow TS-1 zeolite caused by the formation of acidic amorphous TiO2–SiO2 nanoparticles in a commercial cyclohexanone ammoximation process

2016 ◽  
Vol 338 ◽  
pp. 340-348 ◽  
Author(s):  
Changjiu Xia ◽  
Min Lin ◽  
Aiguo Zheng ◽  
Yanjuan Xiang ◽  
Bin Zhu ◽  
...  
Keyword(s):  
Sio2 Nanoparticles ◽  
Cyclohexanone Ammoximation ◽  
Amorphous Tio2

Multilayer Polymeric Nano composite Membrane for Oxygen Separation

2019 ◽  
Vol 1 (2) ◽  
pp. 1-11
Author(s):  
Gobi Nallathambi ◽  
Hazel Dhinakaran
Keyword(s):  
Polymer Concentration ◽  
Sio2 Nanoparticles ◽  
Air Separation ◽  
Regression Equations ◽  
Permeate Flux ◽  
Nano Composite ◽  
Box Behnken Design ◽  
Oxygen Selectivity ◽  
Multilayer Membrane ◽  
Spun Fiber

Air separation is a process of separating primary components from the atmospheric air. Development of membrane technologies plays a key role in air separation. Multi-layer polymeric nanocomposite membranes have been developed by a novel technique using Polyacrylonitrile (PAN) and cellulose acetate (CA) along with nano silica particles (SiO2) to obtain a higher oxygen selectivity and permeability. For the construction of the multilayer membrane, the Box-Behnken design has been used by employing three independent variables namely PAN Electro spinning time, the SiO2 percentage in the PAN polymer and CA/PEG polymer concentration. The developed membranes have been characterized for its surface morphology and physical properties. Along with the analysis of compound desirability, the results were also subject to statistical analysis in order to form regression equations. The electro spun fiber diameter increases along with the concentration of SiO2 nanoparticles and the range is from 50 nm to 400 nm. Moreover, the maximum pore size on the surface of the membrane lies between 200 to 400 nm whereas the maximum percentage of oxygen purity obtained is 48 with the permeate flux of 5.45 cm3/cm2/min.

4-Hydroxy Pyridinium Triflate@SiO2 Nanoparticles as a Novel Efficient Catalyst for Fries Rearrangement of Aryl Esters with High Selectivity

2020 ◽  
Vol 17 (8) ◽  
pp. 654-660
Author(s):  
Shermineh Sadat Ghalehbandi ◽  
Dadkhoda Ghazanfari ◽  
Sayed Ali Ahmadi ◽  
Enayatollah Sheikhhosseini
Keyword(s):  
High Selectivity ◽  
Sio2 Nanoparticles ◽  
High Yield ◽  
Synthetic Method ◽  
Functionalized Silica ◽  
Efficient Catalyst ◽  
Fries Rearrangement ◽  
Free Condition ◽  
Solvent Free Condition ◽  
Work Up

Introduction: We developed a simple, fast and new method for the Fries rearrangement of aryl esters. Materials and Methods: 4-Hydroxy pyridinium triflate functionalized silica is a very efficient, reusable and economically available catalyst for the Fries rearrangement in solvent-free condition and under microwave irradiation. Results and Discussion: Also, a notable selectivity was observed in the presence of 4-hydroxy pyridinium triflate functionalized silica. Conclusion: Selectivity, shorter reaction time, high yield, and easy work-up are advantages of this synthetic method.

Functionalized Surface-Charged SiO2 Nanoparticles Induce Pro-Inflammatory Responses, but Are Not Lethal to Caco-2 Cells

2020 ◽  
Vol 33 (5) ◽  
pp. 1226-1236 ◽  
Author(s):  
Saeko Tada-Oikawa ◽  
Mana Eguchi ◽  
Michiko Yasuda ◽  
Kiyora Izuoka ◽  
Akihiko Ikegami ◽  
...  
Keyword(s):  
Inflammatory Responses ◽  
Sio2 Nanoparticles ◽  
Functionalized Surface

scholarly journals Graphene/SiO2 nanocomposites: The enhancement of photocatalytic and biomedical activity of SiO2 nanoparticles by graphene

2017 ◽  
Vol 121 (24) ◽  
pp. 244901 ◽  
Author(s):  
Aqsa Arshad ◽  
Javed Iqbal ◽  
Qaisar Mansoor ◽  
Ishaq Ahmed
Keyword(s):  
Sio2 Nanoparticles ◽  
Sio2 Nanocomposites

Molecular Imprinting and Immobilization of Cellulase Onto Magnetic Fe3O4@SiO2 Nanoparticles

2014 ◽  
Vol 14 (4) ◽  
pp. 2931-2936 ◽  
Author(s):  
Yue Li ◽  
Xiang-Yu Wang ◽  
Rui-Zhuo Zhang ◽  
Xiao-Yun Zhang ◽  
Wei Liu ◽  
...  
Keyword(s):  
Molecular Imprinting ◽  
Sio2 Nanoparticles ◽  
Magnetic Fe3o4

scholarly journals Excellent Performances of Composite Polymer Electrolytes with Porous Vinyl-Functionalized SiO2 Nanoparticles for Lithium Metal Batteries

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2468
Author(s):  
Hui Zhan ◽  
Mengjun Wu ◽  
Rui Wang ◽  
Shuohao Wu ◽  
Hao Li ◽  
...  
Keyword(s):  
Polymer Electrolytes ◽  
Specific Capacity ◽  
Sio2 Nanoparticles ◽  
Inorganic Materials ◽  
Solid Polymer Electrolytes ◽  
Lithium Metal ◽  
Composite Polymer ◽  
Composite Electrolyte ◽  
Composite Polymer Electrolytes ◽  
Lithium Metal Batteries

Composite polymer electrolytes (CPEs) incorporate the advantages of solid polymer electrolytes (SPEs) and inorganic solid electrolytes (ISEs), which have shown huge potential in the application of safe lithium-metal batteries (LMBs). Effectively avoiding the agglomeration of inorganic fillers in the polymer matrix during the organic–inorganic mixing process is very important for the properties of the composite electrolyte. Herein, a partial cross-linked PEO-based CPE was prepared by porous vinyl-functionalized silicon (p-V-SiO2) nanoparticles as fillers and poly (ethylene glycol diacrylate) (PEGDA) as cross-linkers. By combining the mechanical rigidity of ceramic fillers and the flexibility of PEO, the as-made electrolyte membranes had excellent mechanical properties. The big special surface area and pore volume of nanoparticles inhibited PEO recrystallization and promoted the dissolution of lithium salt. Chemical bonding improved the interfacial compatibility between organic and inorganic materials and facilitated the homogenization of lithium-ion flow. As a result, the symmetric Li|CPE|Li cells could operate stably over 450 h without a short circuit. All solid Li|LiFePO4 batteries were constructed with this composite electrolyte and showed excellent rate and cycling performances. The first discharge-specific capacity of the assembled battery was 155.1 mA h g−1, and the capacity retention was 91% after operating for 300 cycles at 0.5 C. These results demonstrated that the chemical grafting of porous inorganic materials and cross-linking polymerization can greatly improve the properties of CPEs.

scholarly journals Multi-level characteristics of TiOx transparent non-volatile resistive switching device by embedding SiO2 nanoparticles

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sera Kwon ◽  
Min-Jung Kim ◽  
Kwun-Bum Chung
Keyword(s):  
Resistive Switching ◽  
High Performance ◽  
Sio2 Nanoparticles ◽  
Visible Range ◽  
Resistive State ◽  
Switching Device ◽  
Structural Density ◽  
Multi Level ◽  
Switching Characteristics ◽  
Switching Devices

AbstractTiOx-based resistive switching devices have recently attracted attention as a promising candidate for next-generation non-volatile memory devices. A number of studies have attempted to increase the structural density of resistive switching devices. The fabrication of a multi-level switching device is a feasible method for increasing the density of the memory cell. Herein, we attempt to obtain a non-volatile multi-level switching memory device that is highly transparent by embedding SiO2 nanoparticles (NPs) into the TiOx matrix (TiOx@SiO2 NPs). The fully transparent resistive switching device is fabricated with an ITO/TiOx@SiO2 NPs/ITO structure on glass substrate, and it shows transmittance over 95% in the visible range. The TiOx@SiO2 NPs device shows outstanding switching characteristics, such as a high on/off ratio, long retention time, good endurance, and distinguishable multi-level switching. To understand multi-level switching characteristics by adjusting the set voltages, we analyze the switching mechanism in each resistive state. This method represents a promising approach for high-performance non-volatile multi-level memory applications.

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