Modeling kinetics of copper uptake by inorganic colloids under high surface coverage conditions

2001 ◽  
Vol 191 (1-2) ◽  
pp. 145-159 ◽  
Author(s):  
Kavitha Subramaniam ◽  
Sotira Yiacoumi
Keyword(s):  
Surface Coverage ◽  
High Surface ◽  
Copper Uptake ◽  
Kinetics Of

Photocatalytic degradation of 2-propanol over TiO2-based thin films in a simulated pilot microreactor

2021 ◽  
Vol 02 ◽  
Author(s):  
Corrado Garlisi ◽  
Ahmed Yusuf ◽  
Giovanni Palmisano
Keyword(s):  
Thin Films ◽  
Gas Phase ◽  
Continuous Flow ◽  
Molecular Diffusion ◽  
Batch Reactor ◽  
High Surface ◽  
Operating Conditions ◽  
Flow Mode ◽  
Doped Tio2 ◽  
Kinetics Of

Background: Microreactor devices have attracted increasing attention over the last years due to their high surface-to-volume ratio which ensures a high heat and mass transfer, short molecular diffusion distance and greater spatial illumination homogeneity compared to traditional reactors. Objective: The aim of this study was to model the kinetics of photodegradation of 2-propanol over TiO2-based thin films in a gas-phase batch-reactor and simulate their performance in a microreactor device. Methods: The reaction was carried out in a gas-phase batch-reactor assessing the reactivity of a single-layer nitrogen (N)-doped TiO2 and a bilayer consisting of N-doped TiO2 as a bottom layer and copper (Cu)-doped TiO2 as a top layer. The kinetics of the photocatalytic process was modelled by Langmuir–Hinshelwood (LH) model. The constants obtained from LH model were used to simulate the performance of the photocatalysts in a microreactor operating in a continuous flow mode and investigating the effect of the volumetric flow rate (Q), initial concentration of pollutant (Co), number of microchannels (n) and microchannel length (l) on the photodegradation of 2-propanol. Results: N-Cu-TiO2 exhibited a higher reactivity but a lower to adsorption ability towards the target pollutant compared to N-TiO2. To maximize and leverage the advantages of microreactor, optimal operating conditions for a continuous flow mode, at steady state, should be moderately low Q and Co, long l and moderate n that minimizes flow maldistribution in parallel. Conclusion: The findings in this work could serve as a basis to design and fabricate efficient microreactors for the removal of VOC in air purification applications.

scholarly journals Membrane-tethered mucin-like polypeptides sterically inhibit binding and slow fusion kinetics of influenza A virus

2020 ◽  
Vol 117 (23) ◽  
pp. 12643-12650 ◽  
Author(s):  
Corleone S. Delaveris ◽  
Elizabeth R. Webster ◽  
Steven M. Banik ◽  
Steven G. Boxer ◽  
Carolyn R. Bertozzi
Keyword(s):  
Lipid Bilayers ◽  
Influenza A ◽  
Conformational Transition ◽  
Molecular Model ◽  
High Surface ◽  
Protective Mechanism ◽  
Dependent Manner ◽  
Influenza A Viruses ◽  
Virus Binding ◽  
Kinetics Of

The mechanism(s) by which cell-tethered mucins modulate infection by influenza A viruses (IAVs) remain an open question. Mucins form both a protective barrier that can block virus binding and recruit IAVs to bind cells via the sialic acids of cell-tethered mucins. To elucidate the molecular role of mucins in flu pathogenesis, we constructed a synthetic glycocalyx to investigate membrane-tethered mucins in the context of IAV binding and fusion. We designed and synthesized lipid-tethered glycopolypeptide mimics of mucins and added them to lipid bilayers, allowing chemical control of length, glycosylation, and surface density of a model glycocalyx. We observed that the mucin mimics undergo a conformational change at high surface densities from a compact to an extended architecture. At high surface densities, asialo mucin mimics inhibited IAV binding to underlying glycolipid receptors, and this density correlated to the mucin mimic’s conformational transition. Using a single virus fusion assay, we observed that while fusion of virions bound to vesicles coated with sialylated mucin mimics was possible, the kinetics of fusion was slowed in a mucin density-dependent manner. These data provide a molecular model for a protective mechanism by mucins in IAV infection, and therefore this synthetic glycocalyx provides a useful reductionist model for studying the complex interface of host–pathogen interactions.

Dynamics and Kinetics of Methanol‐Graphite Interactions at Low Surface Coverage

ChemPhysChem ◽  
2019 ◽  
Vol 20 (17) ◽  
pp. 2171-2178 ◽  
Author(s):  
Xiangrui Kong ◽  
Erik S. Thomson ◽  
Nikola Marković ◽  
Jan B. C. Pettersson
Keyword(s):  
Surface Coverage ◽  
Kinetics Of

scholarly journals Formation of toroidal Li2O2 in non-aqueous Li–O2 batteries with Mo2CTx MXene/CNT composite

RSC Advances ◽  
2019 ◽  
Vol 9 (70) ◽  
pp. 41120-41125 ◽  
Author(s):  
Mihye Wu ◽  
Do Youb Kim ◽  
Hyunsoo Park ◽  
Kyeong Min Cho ◽  
Ju Ye Kim ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Growth Model ◽  
Surface Coverage ◽  
Cathode Surface ◽  
High Surface ◽  
Solution Growth

Mo2CTx supported on carbon nanotube was first applied as a cathode for Li–O2 batteries. The high surface coverage of Mo2CTx resulted in the toroidal Li2O2 formation via solution growth model due to the inaccessibility of O2 to the cathode surface.

scholarly journals PYRENE EMISSION FROM MONOLAYERS "CLICKED" ONTO QUARTZ

2013 ◽  
Vol 01 (01) ◽  
pp. 1250007
Author(s):  
HONGYAN SONG ◽  
SERGEY GORELIK ◽  
JONATHAN HOBLEY ◽  
JIEXUN LI ◽  
AÏCHA BOUDHAR ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Surface Coverage ◽  
Charge Transfer Band ◽  
Photophysical Properties ◽  
High Surface ◽  
Excimer Emission ◽  
Excitation Spectra ◽  
Visible Absorption ◽  
Molecular Monolayers ◽  
A Charge

A series of quartz surfaces were modified with a series of crosslinkers and functional groups in order to obtain an azide-terminated monolayer, which was then used to immobilize pyrene onto the surface via alkyne-azide "click" chemistry. During the course of the immobilization, different ratios of tert-butyl diphenyl chlorosilane were used to control the distribution and hence the photophysical properties of the pyrene on the surface. The preparative surface reactions and photophysical properties were investigated with contact angle, X-ray photoelectron spectroscopy, UV-visible absorption and emission spectroscopy. High surface coverage was achieved of just under 1molecule per nm2. At this coverage all emission from the pyrene was in the form of excimer emission. Excimer emission dominated at all surface coverages greater than 0.45 molecules per nm2. Below this coverage the monomer emission could also be observed. The conclusions that can be drawn are important for understanding the interactions of neighboring molecules in molecular monolayers. Our results suggest that at high surface coverage a substantial number of the pyrene molecules are already close enough to their neighbors that pairs of them can be directly excited to form excimer with no requirement for diffusion. This can be stated because the long wavelength end of the pyrene absorption and excitation spectra show a broad tail that is assigned to a charge transfer band resulting from an electron being directly transferred from a ground state pyrene to a neighboring pyrene molecule. Furthermore, absorption spectra shifts also indicate that the pyrene molecules undergo some interactions on the surface when they are closely packed.

scholarly journals High surface coverage of a self-assembled monolayer by in situ synthesis of palladium nanodeposits

Nanoscale ◽  
2017 ◽  
Vol 9 (35) ◽  
pp. 13281-13290 ◽  
Author(s):  
Lucía Herrer ◽  
Victor Sebastian ◽  
Santiago Martín ◽  
Alejandro González-Orive ◽  
Francesc Pérez-Murano ◽  
...  
Keyword(s):  
Surface Coverage ◽  
High Surface ◽  
In Situ Synthesis ◽  
Self Assembled Monolayer ◽  
Confined Growth ◽  
Growth Method ◽  
Self Assembled

Nascent metal|monolayer|metal devices have been fabricated by depositing palladium, by growing palladium nanodeposits through a CO-confined growth method.

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