, hence the thermal stability and catalytic activities can be tailored. Some of the factors affecting the catalytic activity for soot oxidation (surfacearea of catalyst, the redox properties of catalyst, the position at which the substitution of the
Authors:D. Sternik, M. Majdan, A. Deryło-Marczewska, G. Żukociński, A. Gładysz-Płaska, V. M. Gun'ko, and S. V. Mikhalovsky
-isothermal conditions recording the Q-TG and Q-DTG weight loss as a function of temperature and time over the 20–200 °C range at a constant heating rate of 6 °C/min [ 20 ].
The specific surfacearea calculated using the BET method [ 21 ] ( Table 1 , S BET
Authors:Anand Maurya, Anurag Kumar Singh, Gaurav Mishra, Komal Kumari, Arati Rai, Bhupesh Sharma, Giriraj T. Kulkarni, and Rajendra Awasthi
improved oral bioavailability (5.6-fold) and half-life of curcumin compared with that of pure curcumin. The improved oral bioavailability of curcumin might be associated with improved solubility due to the increased effective surfacearea of NPs [ 23
Authors:M. Barczak, M. Oszust-Cieniuch, P. Borowski, Z. Fekner, and E. Zięba
the highest specific surfacearea, S BET , value—947 and 969 m 2 /g, respectively. In general, values of S BET decrease significantly with an increasing content of sucrose. In the series of materials within the same amount of sucrose added, S BET
Authors:Grzegorz Makomaski, Wiesława Ciesińska, and Janusz Zieliński
increase rate of 10 K/min. In addition, for the obtained AC the determination of BET surfacearea on the basis of volumetric low-temperature adsorption of nitrogen, mesopore and micropore volume from benzene adsorption/desorption isotherms (gravimetric
Authors:J. Skubiszewska-Zięba, B. Charmas, R. Leboda, V. A. Tertykh, and V. V. Yanishpolskii
. Such materials are characterized by high specific surfacearea and well developed porous structure with ordered framework and narrow pore size distribution. The structure of mesoporous materials allows using them as host materials, catalyst for
Authors:Dariusz Szychowski, Barbara Pacewska, Grzegorz Makomaski, Janusz Zieliński, Wiesława Ciesińska, and Tatiana Brzozowska
work [ 1 ]. It was shown possibility of synthesis mesoporous carbon by the following steps: impregnation mineral matrix by carbon precursor, carbonization, dissolving of matrix or its removing by thermal degradation. Specific surfacearea of these
Selection of adsorbent for the development of purification process for biomolecules is crucial due to the requirement of large number of binding sites and adsorption area. Considering this, porous structure with high charge density is selected as an adsorbent for macromolecule purification. Such selection may provide high static binding capacity but causes loss of separation performance due to improper porosity of adsorbent in comparison to solute sizes involved. To address this problem for the screening of adsorbent, this work reports adsorbent selection procedure on the basis of adsorbent pore diameter (dp), solute hydrodynamic dimensions (RH), and flow velocity in support of binding capacity. Towards that end, this study evaluated the pore accessibility performance of varying characteristics adsorbents using tracers like acetone, lysozyme, and bovine serum albumin (BSA) by designing nonbinding conditions. All screened adsorbents showed certain loss of total surface area depending on the solute dimensions and pore size. Sepharose type adsorbents showed accessible area loss up to 25% for lysozyme and 50% for BSA. Sepabeads type showed 30% loss, while macroporous UNO type showed only 7% loss of surface area for lysozyme. The study correlates accessibility with size ratio β (dp/RH). The value of β > 38 is found to be required for the accessibility of total pore area and optimum separation performance of ion exchangers investigated. Accessibility and β provide useful information for the selection of suitable adsorbent for the purification of macromolecules.
The metal-organic framework (MOF) is a kind of new type self-assembly porous coordination polymer, which possesses many characteristics such as homologic hole, controllable size of cave, high specific surface area, and good chemical stability. In this study, a three-dimensional framework [Zn2(d-Cam)2(4,4′-bpy)]n with large homochiral channel and the orderly arrangement of left- and right-handed helices was used as chiral stationary phases (CSPs) in gas chromatography (GC). [Zn2(d-Cam)2 (4,4′-bpy)]n-coated open tubular column was prepared by a dynamic coating method for high-resolution GC. Some racemates, isomers, linear alkanes, and alcohols are used as the targets for separation. The column coating properties efficiency, polarity, and selectivity were studied. The experimental results show that the stationary phase has outstanding selectivity and also possesses good recognition ability toward these compounds.