Hydrogenation of the LOHC Compound Monobenzyl Toluene over ZrO2 -supported Ru Nanoparticles: A Consequence of Zirconium Hydroxide's Surface Hydroxyl Group and Surface Area

ChemCatChem ◽  
2018 ◽  
Vol 10 (16) ◽  
pp. 3406-3410 ◽  
Author(s):  
Tae Wan Kim ◽  
Seowoo Park ◽  
Jinho Oh ◽  
Chae-Ho Shin ◽  
Young-Woong Suh
Keyword(s):  
Surface Area ◽  
Hydroxyl Group ◽  
Surface Hydroxyl ◽  
Ru Nanoparticles

The Behavior of Surface Hydroxyl Group of Magnetic Iron Oxide Particles

Ferrites ◽  
1982 ◽  
pp. 545-547
Author(s):  
Hiroshi Sugihara ◽  
Yasuta Taketomi ◽  
Tatsuo Uehori ◽  
Yasuo Imaoka
Keyword(s):  
Iron Oxide ◽  
Hydroxyl Group ◽  
Iron Oxide Particles ◽  
Magnetic Iron Oxide ◽  
Surface Hydroxyl ◽  
Oxide Particles

scholarly journals Hydroxyl-Group Identification Using O K-Edge XAFS in Porous Glass Fabricated by Hydrothermal Reaction and Low-Temperature Foaming

Molecules ◽  
2019 ◽  
Vol 24 (19) ◽  
pp. 3488 ◽  
Author(s):  
Masanori Suzuki ◽  
Shigehiro Maruyama ◽  
Norimasa Umesaki ◽  
Toshihiro Tanaka
Keyword(s):  
Low Temperature ◽  
Surface Area ◽  
Porous Glass ◽  
Hydrothermal Reaction ◽  
Group Identification ◽  
Fluorescence Yield ◽  
Hydroxyl Group ◽  
Hydroxyl Groups ◽  
Oh Groups ◽  
Xafs Spectroscopy

Porous glass was prepared by the hydrothermal reaction of sodium borosilicate glass, and oxygen-ion characterization was used to identify the hydroxyl groups in its surface area. A substantial amount of “water” was introduced into the ionic structure as either OH− groups or H2O molecules through the hydrothermal reaction. When the hydrothermally treated glass was reheated at normal pressures, a porous structure was formed due to the low-temperature foaming resulting from the evaporation of H2O molecules and softening of the glass. Although it was expected that the OH− groups would remain in the porous glass, their distribution required clarification. Oxygen K-edge X-ray absorption fine structure (XAFS) spectroscopy enables the bonding states of oxygen ions in the surface area and interior to be characterized using the electron yield (EY) and fluorescence yield (FY) mode, respectively. The presence of OH− groups was detected in the O K-edge XAFS spectrum of the porous glass prepared by hydrothermal reaction with a corresponding pre-edge peak energy of 533.1 eV. In addition, comparison of the XAFS spectra obtained in the EY and FY modes revealed that the OH− groups were mainly distributed in the surface area (depths of several tens of nanometers).

Biocompatibility and Functional Performance of a Polyethylene Glycol Acid-Grafted Cellulosic Membrane for Hemodialysis

2000 ◽  
Vol 23 (6) ◽  
pp. 356-364 ◽  
Author(s):  
V. Sirolli ◽  
S. Di Stante ◽  
S. Stuard ◽  
L. Di Liberato ◽  
L. Amoroso ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Functional Performance ◽  
Sialyl Lewis X ◽  
Hydroxyl Group ◽  
Hydroxyl Groups ◽  
Dialysis Session ◽  
Cellulose Diacetate ◽  
Activation Markers ◽  
Surface Hydroxyl ◽  
Cellular Expression

In order to improve the biochemical reactivity of the cellulose polymer, which is mainly attributed to the presence of surface hydroxyl groups, derivatized cellulosic membranes have been engineered replacing or masking some or all of the hydroxyl groups in the manufacturing process of the membrane. The present study was set up to analyze both biocompatibility and functional performance of two different derivatized cellulosic membranes (cellulose diacetate; polyethylene glycol, PEG, acid-grafted cellulose) as compared to a synthetic membrane (polymethylmethacrylate, PMMA). Cellulose diacetate is prepared by substituting hydroxyl groups with acetyl groups; PEG cellulose is obtained by grafting PEG chains onto the cellulosic polymer with a smaller amount of substitution than cellulose diacetate. While the three dialyzers provided similar urea and creatinine removal, the dialyzer containing cellulose diacetate showed a reduced ability to remove β2-microglobulin compared to that containing PEG cellulose or PMMA. A transient reduction in leukocyte count was observed for both derivatized cellulosic membranes. The neutrophil and monocyte counts throughout the entire dialysis session showed a closer parallelism with the cellular expression of the adhesive receptor CD15s (sialyl-Lewis x molecole) than with CD11b/CD18 expression. Platelet activation, as indicated by the percentage of cells expressing the activation markers CD62P (P-selectin) and CD63 (gp53), occurred with all membranes at 15 min of dialysis and also with PMMA at 30 min. An increased formation of platelet-neutrophil and platelet-monocyte coaggregates was found at 15 and 30 min during dialysis with cellulose diacetate and PMMA but not with PEG cellulose. Generally in concomitance with the increase in platelet-neutrophil coaggregates, an increased hydrogen peroxide production by neutrophils occurred. Our results indicate that derivatizing cellulose may represent a useful approach to improve the biocompatibility of the cellulose polymer, though some homeostatic reactions remain activated. Our results also indicate that there may be a great variability in the biocompatibility profile of derivatized cellulosic membranes which most likely stem from the different type of structural modification rather than from the degree of hydroxyl group replacement.

scholarly journals A succinct strategy for construction of nanoporous ionic organic networks from a pyrylium intermediate

2019 ◽  
Vol 55 (89) ◽  
pp. 13450-13453 ◽  
Author(s):  
Siying Che ◽  
Zhenzhen Yang ◽  
Ilja Popovs ◽  
Huimin Luo ◽  
Yali Luo ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Pyridinium Salt ◽  
Hydroxyl Group ◽  
Template Free ◽  
Organic Networks

A two-step strategy under metal- and template-free conditions is presented for the fabrication of hydroxyl group and pyridinium salt-bifunctionalized nanoporous ionic organic networks with high surface area.

Measurement of vibrational energy relaxation of a surface hydroxyl group by ultrashort tunable infrared pulses

1993 ◽  
Vol 283 (1-3) ◽  
pp. A242
Author(s):  
Chiaki Hirose ◽  
Yasumasa Goto ◽  
Naotoshi Akamatsu ◽  
Junko Kondo ◽  
Kazunari Domen
Keyword(s):  
Vibrational Energy ◽  
Energy Relaxation ◽  
Hydroxyl Group ◽  
Vibrational Energy Relaxation ◽  
Surface Hydroxyl

Measurement of vibrational energy relaxation of a surface hydroxyl group by ultrashort tunable infrared pulses

1993 ◽  
Vol 283 (1-3) ◽  
pp. 244-247 ◽  
Author(s):  
Chiaki Hirose ◽  
Yasumasa Goto ◽  
Naotoshi Akamatsu ◽  
Junko Kondo ◽  
Kazunari Domen
Keyword(s):  
Vibrational Energy ◽  
Energy Relaxation ◽  
Hydroxyl Group ◽  
Vibrational Energy Relaxation ◽  
Surface Hydroxyl

Ab-Initio Hartree-Fock Study of Surface Hydroxyl Group on Lithium Oxide

1996 ◽  
Vol 30 (3P2A) ◽  
pp. 874-878 ◽  
Author(s):  
Masaki Taniguchi ◽  
Satoru Tanaka
Keyword(s):  
Ab Initio ◽  
Lithium Oxide ◽  
Hydroxyl Group ◽  
Surface Hydroxyl ◽  
Hartree Fock

The efficiency and mechanism of γ-alumina catalytic ozonation of 2-methylisoborneol in drinking water

2006 ◽  
Vol 6 (3) ◽  
pp. 43-51 ◽  
Author(s):  
L. Chen ◽  
F. Qi ◽  
B. Xu ◽  
Z. Xu ◽  
J. Shen ◽  
...  
Keyword(s):  
Drinking Water ◽  
Ph Value ◽  
Relative Concentration ◽  
Catalytic Ozonation ◽  
Hydroxyl Group ◽  
Ozone Decomposition ◽  
Group Status ◽  
Remarkable Effect ◽  
Surface Hydroxyl ◽  
Ozonation Process

The efficiency and mechanism in degradation of 2-methylisoborneol (MIB) as a taste and odour compound in drinking water were studied under the condition where γ-alumina catalysed ozonation. As a result, γ-alumina can show distinct activity in enhancing the efficiency of ozonation of MIB. Tert-butyl alcohol had a remarkable effect on the removal efficiency of catalytic ozonation of MIB. The surface charge status, surface hydroxyl group status of γ-alumina, and pH values of the solution can be linked together. When the pH value of the solution was near the pHzpc of γ-Al2O3, there was observable activity in the catalysed ozonation process. Rct, which denoted the relative concentration of hydroxyl radical (·OH), was much higher in the catalysed ozonation process than in the ozonation process. This result further illuminated that γ-Al2O3 can promote ozone decomposition to produce ·OH. Finally, the effect of rP/I on catalysed ozone decomposition and ozone decomposition was investigated.

The structure of an intercalated ordered kaolinite — a Raman microscopy study

Clay Minerals ◽  
1997 ◽  
Vol 32 (4) ◽  
pp. 587-596 ◽  
Author(s):  
R. L. Frost ◽  
T. H. Tran ◽  
J. Kristof
Keyword(s):  
Raman Band ◽  
Low Frequency ◽  
Potassium Acetate ◽  
Microscopy Study ◽  
Raman Microscopy ◽  
Hydroxyl Group ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Inner Surface ◽  
Order Of Magnitude

AbstractChanges in the molecular structure of a highly ordered kaolinite, intercalated with urea and potassium acetate, have been studied using Raman microscopy. A new Raman band, attributed to the inner surface hydroxyl groups strongly hydrogen bound to the acetate, is observed at 3605 cm-1 for the potassium acetate intercalate with the consequential loss of intensity in the bands at 3652, 3670, 3684 and 3693 cm-1. Remarkable changes in intensity of the Raman spectral bands of the low-frequency region of the kaolinite occurred upon intercalation. In particular, the 144 and 935 cm-1 bands increased by an order of magnitude and were found to be polarized. These spectroscopic changes provide evidence for the inner surface hydroxyl group-acetate bond being at an angle approaching 90° to the 001 face. Decreases in intensity of the bands at 243, 271 and 336 cm-1 were observed. The urea intercalate shows additional Raman bands at 3387, 3408 and 3500 cm-1 which are attributed to N-H vibrations after formation of the urea-kaolinite complex. Changes in the spectra of the inserting molecules were also observed.

Sign in / Sign up

Export Citation Format

Share Document