scholarly journals Sequential deposition of microdroplets on patterned surfaces

Soft Matter ◽  
2018 ◽  
Vol 14 (43) ◽  
pp. 8709-8716 ◽  
Author(s):  
Pallav Kant ◽  
Andrew L. Hazel ◽  
Mark Dowling ◽  
Alice B. Thompson ◽  
Anne Juel
Keyword(s):  
Numerical Modelling ◽  
Inkjet Printing ◽  
Patterned Surfaces ◽  
Patterned Substrates ◽  
Sequential Deposition ◽  
Physico Chemical

We use a combination of experiments and numerical modelling to investigate the influence of physico-chemical-patterned substrates on the spreading of fluid deposited as a partially overlapping sequence of droplets via inkjet printing. We find that both topography and wettability variations are required for robust pixel filling without overspill.

Underwater Wetting Behavior on Micro-Patterned Surfaces

2016 ◽  
Author(s):  
Surjyasish Mitra ◽  
Naga Siva Kumar Gunda ◽  
Sushanta K. Mitra
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Experimental Investigation ◽  
Contact Angles ◽  
Patterned Surfaces ◽  
Patterned Substrates ◽  
Textured Surfaces ◽  
Wetting Behavior ◽  
Receding Contact ◽  
Silicon Based

An experimental study has been presented to validate the applicability of Wenzel and Cassie-Baxter theories for wetting of textured surfaces placed under-water. Silicon based micro-patterned substrates are fabricated and careful experimental investigation has been performed to study the wetting signature of oil drops on these substrates when placed under-water. On analysis of relevant experimental data (macroscopic advancing, equilibrium and receding contact angles), it has been found that they are inconsistent with the Wenzel and Cassie-Baxter wetting theories.

Fabrication of Nanoscale Circuits on Inkjet-Printing Patterned Substrates

2015 ◽  
Vol 27 (26) ◽  
pp. 3928-3933 ◽  
Author(s):  
Shuoran Chen ◽  
Meng Su ◽  
Cong Zhang ◽  
Meng Gao ◽  
Bin Bao ◽  
...  
Keyword(s):  
Inkjet Printing ◽  
Patterned Substrates ◽  
Nanoscale Circuits

Patterned surfaces with the controllable drug doses using inkjet printing

2021 ◽  
Author(s):  
Sina Azizi Machekposhti ◽  
Bin Zhang ◽  
Roger Sachan ◽  
Lyndsi Vanderwal ◽  
Shane J. Stafslien ◽  
...  
Keyword(s):  
Inkjet Printing ◽  
Patterned Surfaces ◽  
Drug Doses

Fast Organic Conditioning of Patterned Surfaces for Capillary Part-to-Substrate Self-Assembly

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
M. Mastrangeli ◽  
K. Jans ◽  
T. Steylaerts ◽  
C. Van Hoof ◽  
J.-P. Celis
Keyword(s):  
Self Assembly ◽  
Binding Sites ◽  
Dip Coating ◽  
The Other ◽  
Patterned Surfaces ◽  
Patterned Substrates ◽  
Organic Species ◽  
Throughput Enhancement ◽  
Selective Chemical ◽  
Fast Chemical

Selective chemical preconditioning of geometrically patterned substrates and parts is necessary to enable capillary part-to-substrate self-assembly. On the other hand, long preparation procedures may preclude the throughput enhancement potentially brought by the technique. In this paper, we investigate the fast chemical preconditioning of patterned substrates by the chemisorption of thiolates from the liquid phase. We found that even under conservative conditions, deposition times as short as 15 s (i.e., about two orders of magnitude shorter than previously reported in specific literature) are sufficient for the intended purpose, which is changing the wetting character of metallic binding sites enough to allow their selective dip-coating with hydrophobic fluid lenses. Moreover, perfect fluid coating conformality is achieved when such short deposition times are combined with the use of recessed binding sites. Our findings further confirm organic species to be remarkable tools for the chemical preconditioning of patterned surfaces as they may help actualize the full benefits of capillary self-assembly for electronic packaging.

Decoration of specific sites on freeze-fractured membranes

1978 ◽  
Vol 36 (2) ◽  
pp. 140-141
Author(s):  
H. Gross ◽  
H. Moor
Keyword(s):  
Pure Water ◽  
Freeze Fracture ◽  
Chemical Properties ◽  
Surface Forces ◽  
Sulfate Pentahydrate ◽  
Copper Sulfate Pentahydrate ◽  
Physico Chemical ◽  
Water Of Hydration ◽  
Small Container ◽  
Binding Forces

Fracturing under ultrahigh vacuum (UHV, p ≤ 10-9 Torr) produces membrane fracture faces devoid of contamination. Such clean surfaces are a prerequisite foe studies of interactions between condensing molecules is possible and surface forces are unequally distributed, the condensate will accumulate at places with high binding forces; crystallites will arise which may be useful a probes for surface sites with specific physico-chemical properties. Specific “decoration” with crystallites can be achieved nby exposing membrane fracture faces to water vopour. A device was developed which enables the production of pure water vapour and the controlled variation of its partial pressure in an UHV freeze-fracture apparatus (Fig.1a). Under vaccum (≤ 10-3 Torr), small container filled with copper-sulfate-pentahydrate is heated with a heating coil, with the temperature controlled by means of a thermocouple. The water of hydration thereby released enters a storage vessel.

Activation of cytochrome c to a peroxidase compound I-type intermediate by H2O2: relevance to redox signalling in apoptosis

2004 ◽  
Vol 71 ◽  
pp. 97-106 ◽  
Author(s):  
Mark Burkitt ◽  
Clare Jones ◽  
Andrew Lawrence ◽  
Peter Wardman
Keyword(s):  
Cytochrome C ◽  
Hydroxyl Radical ◽  
Redox Regulation ◽  
Chemotherapeutic Agents ◽  
Tyrosyl Radical ◽  
Compound I ◽  
Definitive Evidence ◽  
Enhanced Production ◽  
Physico Chemical

The release of cytochrome c from mitochondria during apoptosis results in the enhanced production of superoxide radicals, which are converted to H2O2 by Mn-superoxide dismutase. We have been concerned with the role of cytochrome c/H2O2 in the induction of oxidative stress during apoptosis. Our initial studies showed that cytochrome c is a potent catalyst of 2′,7′-dichlorofluorescin oxidation, thereby explaining the increased rate of production of the fluorophore 2′,7′-dichlorofluorescein in apoptotic cells. Although it has been speculated that the oxidizing species may be a ferryl-haem intermediate, no definitive evidence for the formation of such a species has been reported. Alternatively, it is possible that the hydroxyl radical may be generated, as seen in the reaction of certain iron chelates with H2O2. By examining the effects of radical scavengers on 2′,7′-dichlorofluorescin oxidation by cytochrome c/H2O2, together with complementary EPR studies, we have demonstrated that the hydroxyl radical is not generated. Our findings point, instead, to the formation of a peroxidase compound I species, with one oxidizing equivalent present as an oxo-ferryl haem intermediate and the other as the tyrosyl radical identified by Barr and colleagues [Barr, Gunther, Deterding, Tomer and Mason (1996) J. Biol. Chem. 271, 15498-15503]. Studies with spin traps indicated that the oxo-ferryl haem is the active oxidant. These findings provide a physico-chemical basis for the redox changes that occur during apoptosis. Excessive changes (possibly catalysed by cytochrome c) may have implications for the redox regulation of cell death, including the sensitivity of tumour cells to chemotherapeutic agents.

Freeze-Dried Matrices for Buccal Administration of Propranolol in Children: Physico-Chemical and Functional Characterization

2020 ◽  
Author(s):  
Angela Abruzzo ◽  
Alessandra Crispini ◽  
Cecilia Prata ◽  
Rosanna Adduci ◽  
Fiore Pasquale Nicoletta ◽  
...  
Keyword(s):  
Functional Characterization ◽  
Physico Chemical ◽  
Freeze Dried
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