A microfluidic approach for the synthesis and assembly of multi-scale porous membranes

RSC Advances ◽  
2015 ◽  
Vol 5 (121) ◽  
pp. 100024-100029 ◽  
Author(s):  
Minggan Li ◽  
Mouhita Humayun ◽  
Bethany Hughes ◽  
Janusz A. Kozinski ◽  
Dae Kun Hwang
Keyword(s):  
Porous Membranes ◽  
Multi Scale ◽  
One Step

Polymeric porous membranes with multiscale pores and heterogeneous functions are synthesized in a one-step fashion using a microfluidic approach.

Metallography and Biomimetics – Or New Surfaces Without Chemistry?

2021 ◽  
Vol 58 (7) ◽  
pp. 446-459
Author(s):  
T. Fox ◽  
S. M. Lößlein ◽  
D. W. Müller ◽  
F. Mücklich
Keyword(s):  
Economic Cost ◽  
Electrical Contacts ◽  
Structured Surfaces ◽  
Multi Scale ◽  
Direct Laser ◽  
One Step ◽  
Fine Structures ◽  
Scale Structures ◽  
Processing Techniques ◽  
Direct Laser Interference Patterning

Abstract Fingerprints, a butterfly’s wings, or a lotus leaf: when it comes to surfaces, there is no such thing as coincidence in animated nature. Based on their surfaces, animals and plants control their wettability, their swimming resistance, their appearance, and much more. Evolution has optimized these surfaces and developed a microstructure that fits every need. It is all the more astonishing that, with regard to technical surfaces, man confines himself to random roughnesses or “smooth” surfaces. It is surely not a problem of a lack of incentives: structured surfaces have already provided evidence of optimizing friction and wear [1, 2, 3, 4], improving electrical contacts [5, 6], making implants biocompatible [7, 8], keeping away harmful bacteria [9], and much more. How come we continue counting on grinding, polishing, sandblasting, or etching? As so often, the problem can be found in economic cost effectiveness. It is possible to produce interesting structures such as those of the feather in Fig. 1. However, generating fine structures in the micro and nanometer range usually requires precise processing techniques. This is complex, time-consuming, and cannot readily be integrated into a manufacturing process. Things are different with Direct Laser Interference Patterning, DLIP) [10, 11]. This method makes use of the strong interference pattern of overlapped laser beams as a “stamp” to provide an entire surface area with dots, lines, or other patterns – in one shot. It thus saves time, allows for patterning speeds of up to 1 m2/min and does it without an elaborate pre- or post-treatment [10, 12]. The following article intends to outline how the method works, which structures can be generated, and how the complex multi-scale structures that nature developed over millions of years can be replicated in only one step.

One-step purification and concentration of DNA in porous membranes for point-of-care applications

Lab on a Chip ◽  
2015 ◽  
Vol 15 (12) ◽  
pp. 2647-2659 ◽  
Author(s):  
S. A. Byrnes ◽  
J. D. Bishop ◽  
L. Lafleur ◽  
J. R. Buser ◽  
B. Lutz ◽  
...  
Keyword(s):  
Nucleic Acid ◽  
Point Of Care ◽  
Porous Membranes ◽  
Complex Samples ◽  
One Step ◽  
Single User ◽  
Nucleic Acid Purification

Nucleic acid purification in porous membranes at the point-of-care from complex samples including nasal matrix and blood using a single-user step.

Multi-Scale Volatility Feature Analysis and Prediction of Gold Price

2017 ◽  
Vol 16 (01) ◽  
pp. 205-223 ◽  
Author(s):  
Fenghua Wen ◽  
Xin Yang ◽  
Xu Gong ◽  
Kin Keung Lai
Keyword(s):  
Structural Breaks ◽  
Price Volatility ◽  
Ensemble Empirical Mode Decomposition ◽  
Gold Price ◽  
Support Vector ◽  
Multi Scale ◽  
Mode Decomposition ◽  
One Step ◽  
External Events ◽  
Artificial Neural Network Ann

Volatility of gold price is of great significance for avoiding the risk of gold investment. It is necessary to understand the effect of external events and intrinsic regularities to make accurate price predictions. This paper first compared EMD with CEEMD algorithm, and the results find that CEEMD algorithm performance is better than that of EMD in analysis gold price volatility. Then this paper uses the complementary ensemble empirical mode decomposition (CEEMD) to decompose the historical price of international gold into price components at different frequencies, and extracts a short-term fluctuation, a shock from significant events and a long-term price. In addition, this paper combines the Iterative cumulative sum of squares (ICSS) with Chow test to test the three event prices for structural breaks, and analyzes the effect of external events on volatility of gold price by comparing the external events with the test results for structural breaks. Finally, this paper constructs support vector machine (SVM) models and artificial neural network (ANN) on three series for prediction, and finds that the SVM performed better in gold price prediction in one-step-ahead and five-step-ahead, and when we combine the SVMs and ANNs with price components to make predictions, the error of the combined prediction is smaller than SVMs and ANNs with separate terms of series extracted.

Fabrication of Porous Membranes for MEMS Packaging by One-Step Anodization in Sulfuric Acid

2007 ◽  
Vol 154 (9) ◽  
pp. K74 ◽  
Author(s):  
R. Hellin Rico ◽  
B. Du Bois ◽  
A. Witvrouw ◽  
C. Van Hoof ◽  
J.-P. Celis
Keyword(s):  
Sulfuric Acid ◽  
Porous Membranes ◽  
Mems Packaging ◽  
One Step

One-step melt-blowing of multi-scale micro/nano fabric membrane for advanced air-filtration

Polymer ◽  
2019 ◽  
Vol 165 ◽  
pp. 174-179 ◽  
Author(s):  
Nanping Deng ◽  
Hongsheng He ◽  
Jing Yan ◽  
Yixia Zhao ◽  
Eya Ben Ticha ◽  
...  
Keyword(s):  
Air Filtration ◽  
Melt Blowing ◽  
Multi Scale ◽  
One Step

scholarly journals Controlled transportation of droplets and higher fog collection efficiency on a multi-scale and multi-gradient copper wire

RSC Advances ◽  
2017 ◽  
Vol 7 (47) ◽  
pp. 29606-29610 ◽  
Author(s):  
Yan Xing ◽  
Sijie Wang ◽  
Shile Feng ◽  
Weifeng Shang ◽  
Siyan Deng ◽  
...  
Keyword(s):  
Anodic Oxidation ◽  
Collection Efficiency ◽  
Copper Wire ◽  
Scale Structure ◽  
Multi Scale ◽  
Fog Collection ◽  
One Step

Via a one-step gradient anodic oxidation, copper wire with a multi-scale structure and a multi-gradient was fabricated and controlled self-propelling of droplet was achieved.

Alumina Porous Membranes Obtained by One-Step Anodizing Process in H2SO4 for MEMS Packaging

2019 ◽  
Vol 3 (9) ◽  
pp. 75-83
Author(s):  
Raquel Hellin Rico ◽  
Jean-Pierre Celis ◽  
Bert Du Bois ◽  
Chris Van Hoof ◽  
Ann Witvrouw ◽  
...  
Keyword(s):  
Porous Membranes ◽  
Mems Packaging ◽  
One Step

Nanoporous Silica of Some Egyptian Diatom Frustules as a Promising Natural Material

2019 ◽  
Vol 9 (3) ◽  
pp. 414-425
Author(s):  
Atef M. Abo-Shady ◽  
Abdelfattah A. Zalat ◽  
Emad A. Al-Ashkar ◽  
Mohamed M. Ghobara
Keyword(s):  
Distribution Patterns ◽  
Natural Material ◽  
Nitzschia Palea ◽  
Multi Scale ◽  
Design Flexibility ◽  
Layer Structures ◽  
One Step ◽  
Silica Microparticles ◽  
Promising Source ◽  
Aulacoseira Granulata

Background: Diatoms are a large unique group of unicellular microalgae with a significant ornamented cell wall made of hydrated silica, which is called "frustule". Their ornamented siliceous shells are usually composed of multi-layer structures with multi-scale porosity, which can be used as a promising source to obtain hierarchical macro and mesoporous silica microparticles. The present study is one step forward through a long road seeking for green nanofabrication techniques of such porous materials that will be economically more efficient with large design flexibility. Materials and Methods: For seeking different porosity scales, architectures, and distribution patterns, a total of 237 diatom species and varieties belonging to 68 genera were identified from 59 samples, which were collected from different Egyptian habitats and environments. Of these eight species were selected to study their frustules' ultra-structures in details, including; Aulacoseira granulata (Ehrenberg) Simonsen, Actinocyclus octonarius Ehrenberg, Cyclotella meneghiniana Kützing, Pleurosira laevis (Ehrenberg) Compére, Synedra ulna (Nitzsch) Ehrenberg, Achnanthes brevipes Agardh, Nitzschia amphibia Grunow and Nitzschia palea (Kützing) W. Smith. Nitzschia palea (Kützing) W. Smith was also isolated and cultivated. Results: The ultrastructure and porosity of all studied species had been revealed. The porosity scale was ranged from 5 to 500 nm in diameter. Conclusion: The obtained results showed the potential of diatom frustules in nanotechnology as a source of natural silica microparticles with macro and mesoporous structures could be of a large interest for applications including ultra, micro and nanofiltration, drug delivery systems, optoelectronics, or other novel nanotechnology applications.

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