Synthesis of High Surface Area Carbon Nanospheres with Wrinkled Cages and Their CO<sub>2</sub> Capture Studies

Singh, Baljeet; Maity, Ayan; Polshettiwar, Vivek

doi:10.1002/slct.201802341

Cited by 18 publications

(12 citation statements)

References 40 publications

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“…Thus, the mobility in both phases and the connection of the two phases (interface area) are the parameters that affect the rate constant. In addition to the rate constant, the time required to reach the equilibrium is another aspect for the practical application of the photochromism/negative photochromism, so that the studies on the negative photochromism in other systems including hydrophilic and hydrophobic phases are worth investigating. − …”

Section: Resultsmentioning

confidence: 99%

Efficient Negative Photochromism by the Photoinduced Migration of Photochromic Merocyanine/Spiropyran in the Solid State

2021

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Efficient negative photochromism was achieved by the photoinduced migration of merocyanine in mesoporous silica to an organophilic clay as spiropyran. Depending on the nature of the organophilic clays (dioctadecyldimethylammonium and dioleyldimethylammonium clays), important differences in the negative photochromisms and the thermal coloration were observed; the dioleyldimethylammonium clay gave a higher yield (98%) and faster reaction (half-life t 1/2 = 2.8 h) than the dioctadecyldimethylammonium clay (94% and t 1/2 = 3.2 h) of the negative photochromism, indicating the important role of the surfactant assembly to control the molecular diffusion.

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Section: Resultsmentioning

confidence: 99%

Efficient Negative Photochromism by the Photoinduced Migration of Photochromic Merocyanine/Spiropyran in the Solid State

2021

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“…Metals, bimetallic nanoparticles, and even single atoms of metals were loaded on DFNS with a strong linker to design stable nanocatalysts. In addition, DFNS has a significant prospect in photonic crystals, 30 RNA extraction from viruses, 31 and in designing new materials such as wrinkled carbon 32 and silica nanosheets. 33 Because upscaling of DFNS is now possible, its use in real industry processes is not far away.…”

Section: Discussionmentioning

confidence: 99%

Dendritic Fibrous Nanosilica: Discovery, Synthesis, Formation Mechanism, Catalysis, and CO₂ Capture–Conversion

Polshettiwar

2022

Acc. Chem. Res.

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Metrics & MoreArticle Recommendations CONSPECTUS: Silica-based mesoporous nanomaterials have been widely used for a range of applications. Although mesopore materials (such as MCM-41 and SBA-15) possess high surface area, due to their tubular pore structures, pore accessibility is restricted, which causes limitations in mass transport. A new nanosilica was needed to overcome these challenges, including better accessibility, controllable particle size, and good stability. In 2010, my group invented dendritic fibrous nanosilica (DFNS), which has now become a family of novel nanosilicas. DFNS has several unique properties: (i) Tunable particle sizes (50 to 1200 nm), (ii) high surface area (500 to 1200 m 2 /g), (iii) tunable pore volume (0.32 to 2.18 cm 3 /g), (iv) wide pore size distribution (3.7 to 25 nm) characterized by radially oriented pores, (v) controllable fiber density (number of fibers per sphere), (vi) variable pore size and pore volume, (vi) high thermal (∼800 °C) and hydrothermal stability, and (vii) mechanical stability (∼130 MPa). DFNS possesses unique dendritic fibrous morphology, and hence can be reached from all sides and easily accessible. DFNS can now be synthesized using a open refluxing protocol, which allowed the scale-up of the process with a sustainable E-factor. In the last 12 years, the DFNS family of materials has been extensively studied for their formation mechanism and range of applications such as catalysis, solar energy harvesting, CO 2 capture, CO 2 conversion, sensing, biomedicine, energy storage and many more. This Account discusses the invention of DFNS, its synthesis with tunable particle size, textural properties (surface area, pore volume, and pore size), and fiber density. In addition, the DFNS formation mechanism via the complex interplay of self-assembly, the dynamics, and coalescence of bicontinuous microemulsion droplets (BMDs) is discussed. Finally, applications of DFNS in a range of fields, that include catalysis, photocatalysis, synthesis of plasmonic black gold, nanosponges of aluminosilicates, CO 2 capture, and CO 2 conversion to fuel, are presented.

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“…Non-conducting and passive nature of silica might a problem for single-atom catalysts. Porous carbon nanocage using KCC-1 as a hard template was used to prepare a three-dimensional accessible surface carbon sphere [35]. Same carbon morphology can be utilized for the preparation of mesoporous carbon-based SAMCs for various applications.…”

Section: Discussionmentioning

confidence: 99%

Cobalt Single Atom Heterogeneous Catalyst: Method of Preparation, Characterization, Catalysis, and Mechanism

Singh¹,

Kumar²,

Singh³

2019

Cobalt Compounds and Applications

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Transition metal nanoparticles and metal oxide have been used extensively for a wide range of applications in electrochemical reactions (HER, ORR, OER) and energy storage (supercapacitors batteries). To make less expensive, the use of transition metal at minimum metal contents without compromising the catalytic activity could be one way. Most of the catalytic process takes place on the surface and reaction dynamic can be manipulated by changing the particle size and shape. For a long time, single metal atom organometallic compounds have been used as a catalyst at the industrial level. However, problems with the homogeneous catalyst to recover back at the end of the process lead to development of heterogeneous single-atom catalysts with equal activity like a homogeneous catalyst. Cobalt single atom has received a tremendous interest of the scientific community due to its excellent catalytic activity and recyclability. Cobalt single-atom catalyst has shown better performance compared with sub-nanometer nanoparticles catalyst for ORR, OER, and HER. This chapter is conferring method of preparation of carbon-based single Co atoms heterogeneous catalyst, their application for ORR, OER, HER reactions, and mechanistic investigations through DFT calculations. The role of single Co metal atoms and anchoring using N or heteroatoms is discussed and compared.

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Synthesis of High Surface Area Carbon Nanospheres with Wrinkled Cages and Their CO₂ Capture Studies

Cited by 18 publications

References 40 publications

Efficient Negative Photochromism by the Photoinduced Migration of Photochromic Merocyanine/Spiropyran in the Solid State

Efficient Negative Photochromism by the Photoinduced Migration of Photochromic Merocyanine/Spiropyran in the Solid State

Dendritic Fibrous Nanosilica: Discovery, Synthesis, Formation Mechanism, Catalysis, and CO₂ Capture–Conversion

Cobalt Single Atom Heterogeneous Catalyst: Method of Preparation, Characterization, Catalysis, and Mechanism

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Synthesis of High Surface Area Carbon Nanospheres with Wrinkled Cages and Their CO2 Capture Studies

Cited by 18 publications

References 40 publications

Efficient Negative Photochromism by the Photoinduced Migration of Photochromic Merocyanine/Spiropyran in the Solid State

Efficient Negative Photochromism by the Photoinduced Migration of Photochromic Merocyanine/Spiropyran in the Solid State

Dendritic Fibrous Nanosilica: Discovery, Synthesis, Formation Mechanism, Catalysis, and CO2 Capture–Conversion

Cobalt Single Atom Heterogeneous Catalyst: Method of Preparation, Characterization, Catalysis, and Mechanism

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Product

Resources

About

Synthesis of High Surface Area Carbon Nanospheres with Wrinkled Cages and Their CO₂ Capture Studies

Dendritic Fibrous Nanosilica: Discovery, Synthesis, Formation Mechanism, Catalysis, and CO₂ Capture–Conversion