The role of surface boron as adsorption center for the sorption of water by porous glass

1967 ◽  
Vol 71 (9) ◽  
pp. 3077-3081 ◽  
Author(s):  
Manfred J. D. Low ◽  
Natesan Ramasubramanian
Keyword(s):  
Porous Glass ◽  
Adsorption Center ◽  
As Adsorption

scholarly journals The Adsorption of Chloromethanes on KCl. The Role of the Surface Ions as Adsorption Sites

1983 ◽  
Vol 56 (7) ◽  
pp. 2086-2089 ◽  
Author(s):  
Masatoshi Chikazawa ◽  
Masatoshi Amada ◽  
Takafumi Kanazawa
Keyword(s):  
Adsorption Sites ◽  
As Adsorption

Modification Effects in Argon Plasma Treated S1O2 Spin-On Glass

1995 ◽  
Vol 381 ◽  
Author(s):  
Min Park ◽  
Joong Whan Lee ◽  
Jin Gun Koo ◽  
Kyung Soo Kim ◽  
Hyung Joun Yoo ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Treatment Time ◽  
Argon Plasma ◽  
Treatment Temperature ◽  
Adsorption Sites ◽  
Long Time ◽  
As Adsorption ◽  
Wet Etch

AbstractWe demonstrated that the quality of siloxane spin-on glass (SOG) films, widely used as interlevel planarization dielectrics, is improved significantly by curing in argon plasma. The wet etch rate of SOG film decreases with increasing plasma treatment temperature or treatment time, and is much lower than that cured in a furnace. Long-time plasma treatment reduces the density of silanols (Si-OH) and methyl (−CH3) group, which act as adsorption sites of water. The results were compared with those obtained from the N2O (or H2 ) plasma treated SOG films. The modification of the SOG film by Ar plasma is related to the radiation damage and the reconstruction of the atomic structure during the plasma exposure. The role of metastable Ar (Ar*) appears to be very important to improve the SOG film; SOG film is more relaxed by the energy released from the conversion of Ar* to Ar.

scholarly journals Arsenic in Soils Affected by Mining: Microscopic Studies vs. Sequential Chemical Extraction

2020 ◽  
Vol 17 (22) ◽  
pp. 8426
Author(s):  
Jessica Álvarez-Quintana ◽  
Rodrigo Álvarez ◽  
Almudena Ordóñez
Keyword(s):  
Electron Microscopy ◽  
Residual Fraction ◽  
Chemical Extraction ◽  
Sequential Chemical Extraction ◽  
Transmission Electron ◽  
Microscopic Studies ◽  
Sequential Extraction Method ◽  
As Adsorption ◽  
Microscopic Techniques

Soil samples from three inactive mines, corresponding to different Arsenic-bearing mineralization types, were collected and studied. The aim was to determine the influence of mine wastes mineralogy/geochemistry and texture in As mobility and to compare results from sequential chemical extraction and microscopic techniques (optical and electron) at a grain scale. Arsenic in soils is found mainly associated to the residual fraction, indicating that mechanical As dispersion is mainly responsible for As soil pollution. The use of objective microscopic techniques (i.e., Scanning Electron Microscopy-Energy Dispersive Spectroscopy -SEM-EDS-, High Resolution Transmission Electron Microscopy -HR-TEM) has pointed out that the selected sequential extraction method overestimates the role of Mn amorphous oxy-hydroxides and organic matter in As retention while underestimating the mechanism of As adsorption onto clay particle surfaces.

scholarly journals On the Role of MFI Membranes During the Shape Preserving Transformation of Porous Glass into MFI-type Zeolite

2012 ◽  
Vol 44 ◽  
pp. 1141-1142
Author(s):  
T. Peppel ◽  
S. Wohlrab ◽  
B. Paul ◽  
R. Kraehnert ◽  
D. Enke
Keyword(s):  
Porous Glass ◽  
Shape Preserving ◽  
Type Zeolite

scholarly journals Silver coordination metallacycles assembled into microporous materials

2014 ◽  
Vol 70 (a1) ◽  
pp. C1249-C1249
Author(s):  
Luciano Marchio' ◽  
Irene Bassanetti ◽  
Corrado Atzeri ◽  
Angiolina Comotti ◽  
Piero Sozzani
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Gas Adsorption ◽  
Structural Features ◽  
Silver Complexes ◽  
Separation And Purification ◽  
Supramolecular Architectures ◽  
Supramolecular Arrangements ◽  
As Adsorption

Porous solid materials represent one of the most intense areas of study for chemists, physicists, and materials scientists [1]. These systems have found a large number of applications in many fields, such as adsorption, separation and purification, as well as catalysis [2]. We have previously shown that when using the pre-organized thioether functionalized bispyrazolylmethane ligand (LSPh) and silver(I), hexameric metallacycles are formed in solution. In the solid state the role of the counteranion (BF4-, PF6-, NO3-, and CF3SO3-) is of fundamental importance in the way the metallacycles self-assembled into a diversity of 3D supramolecular architectures and cavities. In particular, highly symmetric BF4-and PF6-favours the formation of crystals with permanent porosity as demonstrated by gas adsorption measurements. In order to modulate the porous properties of these silver coordination polymer (CP), we synthesised a series of differently functionalized bis(pyrazolyl)methane ligands (Figure). The silver complexes were prepared with two types of anions (PF6-and CF3SO3-) to investigate their role in the supramolecular arrangements. The structural features and gas sorption properties (CO2, CH4and N2) of the new silver complexes will be presented. Solid state NMR was employed to investigate the localization of CO2within the cavities.

scholarly journals Adsorption and coagulation in wastewater treatment – Review

2021 ◽  
Keyword(s):  
Wastewater Treatment ◽  
Environment Friendly ◽  
Advantages And Disadvantages ◽  
Natural Substances ◽  
Treatment Review ◽  
Physicochemical Methods ◽  
As Adsorption ◽  
Chemical Material ◽  
Chemical Materials

Abstract Wastewater issues became a complex challenge in the world. There are several methods in wastewater treatment, such as chemical, physical, biological, and the combination of each method. However, each process has advantages and disadvantages. The physicochemical methods are common methods used in wastewater treatment, such as adsorption and coagulation. Adsorption and coagulation are excellent methods to remove pollutants. The adsorption process is greatly influenced by pH, adsorbent dose, temperature, and contact time. Coagulant dose, settling time, and pH are the main factors in the coagulation process. Chemical material as an adsorbent and coagulant has been studied in previous research, but recently, to substitution chemical materials is a challenging subject. Natural substances are potential new materials in wastewater treatment and became popular due to their efficiency and environment friendly characteristics. This review investigated the role of adsorption and coagulation in wastewater treatment and the utilization of natural materials as adsorbents and coagulants.

Picosecond Dynamics of Excited 9,9‘-Bianthryl Adsorbed on Porous Glass:  Role of Symmetry Breaking in the Ground State†

2002 ◽  
Vol 106 (10) ◽  
pp. 2067-2073 ◽  
Author(s):  
Yasuyuki Tsuboi ◽  
Tamami Kumagai ◽  
Masato Shimizu ◽  
Akira Itaya ◽  
Gerd Schweitzer ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Porous Glass ◽  
Ground State

The role of sodium ions as adsorption sites in silicalite-1

1990 ◽  
Vol 86 (3) ◽  
pp. 561 ◽  
Author(s):  
Yasuyuki Matsumura ◽  
Keiji Hashimoto ◽  
Hisayoshi Kobayashi ◽  
Satohiro Yoshida
Keyword(s):  
Sodium Ions ◽  
Adsorption Sites ◽  
As Adsorption

scholarly journals Adsorption space for microporous polymers with diverse adsorbate species

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Dylan M. Anstine ◽  
Dai Tang ◽  
David S. Sholl ◽  
Coray M. Colina
Keyword(s):  
Critical Role ◽  
Fractional Free Volume ◽  
Simulation Data ◽  
High Performing ◽  
Microporous Polymers ◽  
As Adsorption ◽  
Polymers Of Intrinsic Microporosity ◽  
Intrinsic Microporosity ◽  
Enormous Number

AbstractThe enormous number of combinations of adsorbing molecules and porous materials that exist is known as adsorption space. The adsorption space for microporous polymers has not yet been systematically explored, especially when compared with efforts for crystalline adsorbents. We report molecular simulation data for the adsorptive and structural properties of polymers of intrinsic microporosity with a diverse set of adsorbate species with 345 distinct adsorption isotherms and over 240,000 fresh and swollen structures. These structures and isotherms were obtained using a sorption-relaxation technique that accounts for the critical role of flexibility of the polymeric adsorbents. This enables us to introduce a set of correlations that can estimate adsorbent swelling and fractional free volume dilation as a function of adsorbate uptake based on readily characterized properties. The separation selectivity of the 276 distinct binary molecular pairs in our data is reported and high-performing adsorbent systems are identified.

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor
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