scholarly journals Solvent-directed sol-gel assembly of 3-dimensional graphene-tented metal oxides and strong synergistic disparities in lithium storage

2016 ◽  
Vol 4 (11) ◽  
pp. 4032-4043 ◽  
Author(s):  
Jianchao Ye ◽  
Yonghao An ◽  
Elizabeth Montalvo ◽  
Patrick G. Campbell ◽  
Marcus A. Worsley ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Sol Gel ◽  
Lithium Storage ◽  
Conversion Reaction ◽  
3 Dimensional ◽  
Graphene Aerogels

The conversion-reaction-based metal oxide/graphene aerogels show much higher capacitive synergy than that observed for intercalation-based TiO2/graphene aerogels.

Recent progress in conversion reaction metal oxide anodes for Li-ion batteries

2017 ◽  
Vol 1 (11) ◽  
pp. 2213-2242 ◽  
Author(s):  
Kangzhe Cao ◽  
Ting Jin ◽  
Li Yang ◽  
Lifang Jiao
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Recent Progress ◽  
Li Ion Batteries ◽  
Conversion Reaction ◽  
Binary Metal ◽  
Binary Metal Oxides ◽  
Li Ion

Single and binary metal oxides based on conversion reactions for Li-ion batteries are discussed in this review.

Application of Nanometer Metal Oxides in Infrared Ray Shielding Transparent Thin Film

2011 ◽  
Vol 474-476 ◽  
pp. 195-199 ◽  
Author(s):  
Ai Hong Guo ◽  
Xue Jiao Tang ◽  
Su Juan Zhang
Keyword(s):  
Thin Film ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Sol Gel ◽  
Volume Ratio ◽  
Experimental Results ◽  
Mass Ratio ◽  
Gel Method ◽  
Water Based ◽  
Better Than

Water-based infrared ray shielding coating, that is, nanometer metal oxide is added to the water-based paint, which has anti-IR features without affecting the transparency of the paint. In this paper, the nanometer oxides are prepared by sol-gel method, added into polypropylene sour. In order to improve the infrared ray shielding of the thin film, two kinds of nanometer oxides are added into the polypropylene sour with different volume ratios, the shielding performance of the paint is studied. Experimental results show: in the 8000 ~ 4000cm-1 range, the transmittances of infrared ray is 30% to 75%; in 4000 ~ 400cm-1 range, transmittances decrease significantly; 3% ZnO, 3% Fe2O3, 3% Y2O3, 2% Al2O3 are the best mass ratio of every single nanometer oxide; the infrared shielding rate of Fe2O3 and Y2O3 mixture with the volume ratio of 1 to 4 is better than Fe2O3 and Y2O3 single.

Facile Botanical Templating Strategies for the Growth of Porous Metal Oxides in Artificial Leaf-Like Macroscale Structures for Potential Use in Energy Related Catalysis

2013 ◽  
Vol 1539 ◽  
Author(s):  
Edward G. Gillan
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Room Temperature ◽  
Sol Gel ◽  
Porous Metal ◽  
Internal Structures ◽  
Battery Systems ◽  
Porous Metal Oxides ◽  
Interconnected Pore ◽  
Potential Use

ABSTRACTA major challenge in utilizing living botanical materials, such as cellular leaf structures, as templates is that they are filled with water and conventional dehydration strategies often collapse or degrade the intricate botanical structure. This restricts the ability to introduce water reactive precursors into such structures. We have developed a room-temperature chemical method using acidified 2,2-dimethoxypropane to dehydrate water-rich botanical materials (e.g., fern leaves and water-rich jade succulents). This mild dehydration process leaves much of the porous cellular leaf structure intact even with ∼90% mass loss. These chemically dehydrated templates have been utilized in the growth of porous and ordered leaf replicate structures consisting of TiO2 and SiO2 via sol-gel precursor impregnation methods. These white metal oxide products exhibit external and internal structures that look very similar to their original templates, but are shrunken intact versions of the original. This paper details the chemical procedures that enable one to effectively use sensitive botanical templates in metal oxide growth. The physical and structural properties of several dried porous templates and macroporous anatase TiO2 and amorphous or crystoballite SiO2 products will be described. Recent efforts to use these botanical templates to produce other porous metal oxides (e.g., Co3O4, NiO, and CuO) using both halide and acetate precursor impregnation strategies are noted. Porous metal oxides with interconnected pore walls may have use in electrochemical energy storage systems, including in photocatalytic, photovoltaic or battery systems.

Tailoring Sol-Gel Transition Processes for the Design of Novel Shape Metal Oxide Materials

2010 ◽  
Vol 1256 ◽  
Author(s):  
Martin Jarvekulg ◽  
Raul Välbe ◽  
Kathriin Utt ◽  
Martin Timusk ◽  
Tanel Tätte
Keyword(s):  
Liquid Crystal ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Sol Gel ◽  
Metal Alkoxide ◽  
Oxide Materials ◽  
Sheet Rolling ◽  
Sol Gel Transition ◽  
Transformation Processes ◽  
Gel Transition

AbstractIn present paper we describe some unconventional adaptions of sol-gel method. Controlled sol-gel transformation processes of metal alkoxide based systems can lead to various novel shapes of metal alkoxide materials. Formation of different structures like tubular microstructures by gel sheet rolling, nano- and microfibres by direct drawing, as well as microtubes of metal oxides and gel dispersed liquid crystal materials are described. Different aspects of sol-gel processes leading to the formation of all of these structures are thereby discussed.

Review. Non-aqueous Sol-Gel Routes to Metal Oxide Nanocrystals under Solvothermal Conditions: Review and Case Study on Doped Group IV Metal Oxides

2010 ◽  
Vol 65 (8) ◽  
pp. 1015-1023 ◽  
Author(s):  
Andrea Pucci ◽  
Nicola Pinna
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Sol Gel ◽  
Group Iv ◽  
Oxide Nanostructures ◽  
Metal Oxide Nanostructures ◽  
Number Of Publications ◽  
Sol Gel Synthesis ◽  
Solvothermal Conditions

Over the last decade, the number of publications concerning the non-aqueous sol-gel synthesis of metal oxide nanostructures has rapidly increased, as this method affords an immense variety of sizes and shapes of the products. This review highlights the versatility of non-aqueous sol-gel routes, under solvothermal conditions, to metal oxide and hybrid materials. In particular, the easier control over the reaction kinetics, compared to aqueous methods, allows to better match the reactivity between metal oxide precursors. This permits to produce complex multimetal and doped oxides at low temperature, as it is discussed in detail for the case of doped group IV metal oxides

Preparation of conducting film composed of polyaniline and metal oxide by sol-gel method

1999 ◽  
Vol 14 (1) ◽  
pp. 5-7 ◽  
Author(s):  
Takuya Hori ◽  
Noriyuki Kuramoto ◽  
Hideyuki Tagaya ◽  
Masa Karasu ◽  
Jun-ichi Kadokawa ◽  
...  
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Sol Gel ◽  
Silica Matrix ◽  
Conducting Film ◽  
Gel Method ◽  
Sol Gel Method

Conducting thin films were prepared by entrapping water-suspended polyaniline into a silica matrix by a sol-gel route. Without metal oxide, the conductivity of the film decreased after heat treatment. However, in the presence of metal oxides such as TiO2 and Al2O3, the conductivity increased after heat treatment at 85 °C and reached 17 Scm−1 The conductivity of the film depended on the kinds and amounts of metal oxides and the temperature of heat treatment.

Gas Permeation Characteristics and Stability of Composite Silica-Metal Oxide Membranes

2002 ◽  
Vol 752 ◽  
Author(s):  
Masashi Asaeda ◽  
Masakoto Kanezashi ◽  
Tomohisa Yoshioka ◽  
Toshinori Tsuru
Keyword(s):  
Activation Energy ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Sol Gel ◽  
Large Change ◽  
Gas Permeation ◽  
Silica Membrane ◽  
Silica Membranes ◽  
The Stability ◽  
Oxide Membranes

ABSTRACTIn order to improve the stability of silica membranes against water (vapor) some metal oxides were added to silica to obtain composite silica-metal oxide membranes by the sol-gel techniques. A Ni-doped silica membrane (Ni/Si=1/2) fired at 500°C showed a relatively large permeance of 1.5×10−5 [m3(STP)/(m2skPa)] with selectivity of 350 (H2/CH4), 4200 (H2/SF6) at 200°C and 100 (CO2/CH4) at 35 °C. After leaving the membrane in humid air (RH: 60%, 40°C) for 70 days, the permeance of H2 decreased by about 50% but the selectivity was improved to 930 for H2/CH4. And little change was observed in the activation energy for H2 permeation, while under the same conditions a silica membrane showed a quite large change in the activation energy from 3.1kJ/mol to 14kJ/mol. There is a possibility that metal oxides added to silica help prevent the densification of silica networks through which hydrogen and helium molecules can permeate.

Preparation of metal oxide supported catalysts and their utilization for understanding the effect of a support on the catalytic activity

2018 ◽  
Vol 42 (1) ◽  
pp. 402-410 ◽  
Author(s):  
Jhumur Seth ◽  
Prashant Dubey ◽  
Vijay R. Chaudhari ◽  
Bhagavatula L. V. Prasad
Keyword(s):  
Catalytic Activity ◽  
Transition Metal ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Metal Nanoparticles ◽  
Supported Catalysts ◽  
Sol Gel ◽  
Transition Metal Nanoparticles ◽  
Gel Method ◽  
Sol Gel Method

A convenient way of anchoring transition metal nanoparticles onto metal oxides by means of a toluene mediated sol–gel method is described.

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