Functionalized stellate macroporous silica nanospheres for CO2 mitigation

2016 ◽  
Vol 51 (23) ◽  
pp. 10632-10640 ◽  
Author(s):  
Daniela R. Radu ◽  
Nicholas A. Pizzi ◽  
Cheng-Yu Lai
Keyword(s):  
Co2 Mitigation ◽  
Silica Nanospheres ◽  
Macroporous Silica

General Cluster Sorption Isotherm

2020 ◽  
Author(s):  
Christoph Buttersack
Keyword(s):  
Density Functional ◽  
Capillary Condensation ◽  
Cluster Formation ◽  
Full Range ◽  
Full Description ◽  
Cross Sectional ◽  
Macroporous Silica ◽  
Isotherm Equation ◽  
Type Iv ◽  
Classical Thermodynamics

<p>Adsorption isotherms are an essential tool in chemical physics of surfaces. However, several approaches based on a different theoretical basis exist and for isotherms including capillary condensation existing approaches can fail. Here, a general isotherm equation is derived and applied to literature data both concerning type IV isotherms of argon and nitrogen in ordered mesoporous silica, and type II isotherms of disordered macroporous silica. The new isotherm covers the full range of partial pressure (10<sup>-6</sup> - 0.7). It relies firstly on the classical thermodynamics of cluster formation, secondly on a relationship defining the free energy during the increase of the cluster size. That equation replaces the Lennard-Jones potentials used in the classical density functional theory. The determination of surface areas is not possible by this isotherm because the cross-sectional area of a cluster is unknown. Based on the full description of type IV isotherms, most known isotherms are accessible by respective simplifications. </p>

scholarly journals Phase Behaviour of Methane Hydrates in Confined Media

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 201
Author(s):  
Hao Bian ◽  
Lu Ai ◽  
Klaus Hellgardt ◽  
Geoffrey C. Maitland ◽  
Jerry Y. Y. Heng
Keyword(s):  
Phase Behaviour ◽  
Methane Hydrates ◽  
Scanning Calorimetry ◽  
Macroporous Silica ◽  
Interfacial Energies ◽  
Temperature Method ◽  
Hydrate Phase ◽  
Dissociation Temperature ◽  
Confined Media ◽  
Decomposition Behaviour

In a study designed to investigate the melting behaviour of natural gas hydrates which are usually formed in porous mineral sediments rather than in bulk, hydrate phase equilibria for binary methane and water mixtures were studied using high-pressure differential scanning calorimetry in mesoporous and macroporous silica particles having controlled pore sizes ranging from 8.5 nm to 195.7 nm. A dynamic oscillating temperature method was used to form methane hydrates reproducibly and then determine their decomposition behaviour—melting points and enthalpies of melting. Significant decreases in dissociation temperature were observed as the pore size decreased (over 6 K for 8.5 nm pores). This behaviour is consistent with the Gibbs–Thomson equation, which was used to determine hydrate–water interfacial energies. The melting data up to 50 MPa indicated a strong, essentially logarithmic, dependence on pressure, which here has been ascribed to the pressure dependence of the interfacial energy in the confined media. An empirical modification of the Gibbs–Thomson equation is proposed to include this effect.

scholarly journals CO2 mitigation or removal, the optimal uses of biomass in energy systems decarbonization

iScience ◽  
2021 ◽  
pp. 102765
Author(s):  
Piera Patrizio ◽  
Mathilde Fajardy ◽  
Mai Bui ◽  
Niall Mac Dowell
Keyword(s):  
Energy Systems ◽  
Co2 Mitigation

Analyzing the Effects of Silica Nanospheres on the Sol–Gel Transition Profile of Thermosensitive Hydrogels

Langmuir ◽  
2021 ◽  
Author(s):  
Lucas S. Ribeiro ◽  
Renata L. Sala ◽  
Leticia A. O. de Jesus ◽  
Sandra A. Cruz ◽  
Emerson R. Camargo
Keyword(s):  
Sol Gel ◽  
Silica Nanospheres ◽  
Thermosensitive Hydrogels ◽  
Sol Gel Transition ◽  
Gel Transition ◽  
Transition Profile

Carborane based mesoporous nanoparticles as a potential agent for BNCT

2021 ◽  
Vol 5 (6) ◽  
pp. 2771-2776
Author(s):  
Yong Wang ◽  
Yanwen Xu ◽  
Jingying Yang ◽  
Xiaoyan Qiu ◽  
Nan Li ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Pancreatic Tumors ◽  
Silica Nanospheres ◽  
Mesoporous Nanoparticles ◽  
Mesoporous Silica Nanospheres

A novel BNCT system targeting pancreatic tumors was created by covalently hybridizing carborane with dendritic mesoporous silica nanospheres.

All solution-processed silver nanowires composite silica nanospheres antireflection structure with synergetic optoelectronic performance

2021 ◽  
Author(s):  
Yuxin Tang ◽  
Wanying Yin ◽  
Yue Huang ◽  
Ganghua Zhang ◽  
Qingbiao Zhao ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Silver Nanowires ◽  
Great Promise ◽  
Silica Nanospheres ◽  
Solution Processed ◽  
Transparent Conductive Films ◽  
Conductive Films

Silver nanowires (AgNWs) network has shown great promise as transparent conductive films (TCFs) due to its excellent optoelectronic performance. In order to replace indium tin oxide (ITO), considerable intricate methods...

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