Low-cost Micro- and Nano-structures in Porous Nanomaterials Realized by Direct Imprinting of Porous Substrates

2011 ◽  
Vol 1340 ◽  
Author(s):  
Judson D. Ryckman ◽  
Marco Liscidini ◽  
J. E. Sipe ◽  
S. M. Weiss
Keyword(s):  
Room Temperature ◽  
Low Cost ◽  
Substrate Material ◽  
Nano Structures ◽  
One Step ◽  
Temperature And Pressure ◽  
Feature Resolution ◽  
Porous Nanomaterials ◽  
Very High ◽  
Porous Substrates

ABSTRACTWe present a simple one-step methodology for direct structuring of porous nanomaterials on the micro- and nano-scale. Our technique, direct imprinting of porous substrates (DIPS), relies on the application of a pre-patterned and reusable stamp to directly imprint porous substrates. DIPS is performed at room temperature and pressure in less than one minute, and circumvents the conventional requirement for resist processing and etching procedures. It is shown that arbitrarily shaped patterns and structures can be transferred to porous nanomaterials with a very high (sub-100nm) feature resolution that is primarily limited by the pore dimensions of the substrate material. DIPS is demonstrated on a wide variety of porous nanomaterials including metals, semiconductors, and insulators. Furthermore, DIPS can be utilized to locally modify material properties including pore dimensions, density, dielectric function, and surface roughness. Lastly, example structures fabricated by DIPS are discussed for their relevance to important applications ranging from drug delivery and imaging, to solar energy conversion, and biosensing.

Temperature Programmed Desorption of Carbon Dioxide for Activated Carbon Supported Nickel Oxide: The Adsorption and Desorption Studies

2015 ◽  
Vol 1087 ◽  
pp. 45-49 ◽  
Author(s):  
Azizul Hakim ◽  
Wan Nor Roslam Wan Isahak ◽  
Maratun Najiha Abu Tahari ◽  
Muhammad Rahimi Yusop ◽  
Mohamed Wahab Mohamed Hisham ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Room Temperature ◽  
Low Cost ◽  
Temperature Programmed Desorption ◽  
High Adsorption ◽  
Solid Sorbents ◽  
Potential Source ◽  
Temperature And Pressure ◽  
Temperature Programmed ◽  
Preliminary Support

The priority of success in practical CO2 capture with solid sorbents is dependent on the development of a low cost sorbent and energy consumption for regeneration with high adsorption capacity. In this work, different loading of NiO were evaluated as a potential source of basic sites for CO2 capture, and activated carbon (AC) was used as a preliminary support in order to study the effect of the impregnation. The NiO loading increased the basicity of the adsorbent significantly enhance the CO2 chemisorption. Nonetheless, it drastically reduced the surface area of the AC, which is chiefly responsible for CO2 physisorption, thus decreasing the carrying capacity of ACs at room temperature and pressure.

scholarly journals Combined Chemical and Thermal Sintering for High Conductivity Inkjet-printed Silver Nanoink on Flexible Substrates

2019 ◽  
Vol 33 (3) ◽  
pp. 377-384 ◽  
Author(s):  
Irena Ivanišević ◽  
Petar Kassal ◽  
Andrea Milinković ◽  
Anamarija Rogina ◽  
Stjepan Milardović
Keyword(s):  
Room Temperature ◽  
Printed Electronics ◽  
Low Cost ◽  
Flexible Substrates ◽  
Capping Agent ◽  
Bulk Silver ◽  
Key Factor ◽  
Silver Electrodes ◽  
Thermal Sintering ◽  
Very High

Electrical conductivity is a key factor in measuring performance of printed electronics,<br /> but the conductivity of inkjet-printed silver nanoinks greatly depends on post-fabrication<br /> sintering. In this work, two different conductive silver nanoinks, in which the silver nanoparticles were stabilized by two different capping agents – Poly(acrylic acid) (PAA) and Poly(methacrylic acid) (PMA) – were synthesized. The inks were inkjet-printed on flexible PET substrates, coated with an additional polycation layer, which facilitated<br /> chemical sintering. The printed features were then exposed to moderately elevated<br /> temperatures to evaluate the effect of combined chemical and thermal sintering. Both<br /> inks produced conductive features at room temperature, and the conductivity increased<br /> with both temperature and duration of sintering. At temperatures above 100 °C, the choice of capping agent had no pronounced effect on conductivity, which approached very high values of 50 % of bulk silver in all cases. The lowest resistivity (2.24 μΩ cm) was obtained after sintering at 120 °C for 180 min. By combining chemical and conventional thermal sintering, we have produced remarkably conductive silver electrodes on flexible substrates, while using low-cost and simple processes.

Direct Imprinting of Porous Substrates: A Rapid and Low-Cost Approach for Patterning Porous Nanomaterials

Nano Letters ◽  
2011 ◽  
Vol 11 (5) ◽  
pp. 1857-1862 ◽  
Author(s):  
Judson D. Ryckman ◽  
Marco Liscidini ◽  
J. E. Sipe ◽  
S. M. Weiss
Keyword(s):  
Low Cost ◽  
Cost Approach ◽  
Porous Nanomaterials ◽  
Porous Substrates

The Production of Titanium Alloy Powder

2013 ◽  
Vol 551 ◽  
pp. 32-36
Author(s):  
J.C. Withers ◽  
V. Shapovalov ◽  
R. Storm ◽  
R.O. Loutfy
Keyword(s):  
Titanium Alloy ◽  
Alloy Powder ◽  
State Of The Art ◽  
Low Cost ◽  
Manufacturing Processes ◽  
Metallothermic Reduction ◽  
One Step ◽  
Gas Blowing ◽  
The Cost ◽  
Very High

Titanium alloy powder provides manufacturing variants to produce a variety of titanium intermediate materials and final products. However, titanium alloy powder is quite expensive at fifteen to thirty times the cost of sponge thus limiting the utilization of titanium powder to produce titanium products. The standard state-of-the-art processing to produce alloy powder results in very high cost of alloy powder. Three new processes have been demonstrated to produce titanium alloy powder at a cost of only 2-5 times the typical cost of sponge. The processes are (1) one step melting of sponge/alloying and gas blowing alloy powder, (2) metallothermic reduction of mixed chloride precursors to produce alloy powder and (3) electrolytic reduction in a fused salt of mixed alloying (TiCl4-AlCl3-VCl4) chlorides. These processes have beeSubscript textn demonstrated to produce low cost titanium alloy powder which can serve as feeds for the variant manufacturing processes to produce low cost titanium products.

scholarly journals Room-temperature solution synthesis of ZnMn2O4 nanoparticles for advanced electrochemical lithium storage

RSC Advances ◽  
2019 ◽  
Vol 9 (16) ◽  
pp. 9075-9078 ◽  
Author(s):  
Chunhui Wang ◽  
Chunxian Zhou ◽  
Bao Zhang ◽  
Xing Ou ◽  
Liang Cao ◽  
...  
Keyword(s):  
Room Temperature ◽  
Low Cost ◽  
Structure Stability ◽  
Solution Synthesis ◽  
Lithium Storage ◽  
Temperature Solution ◽  
One Step

ZnMn2O4 nanoparticles were fabricated via a low-cost and ecofriendly one-step approach at room temperature. The particles exhibited excellent structure stability and superior lithium storage.

scholarly journals Polyaniline Nanotubes/Carbon Cloth Composite Electrode by Thermal Acid Doping for High-Performance Supercapacitors

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2053 ◽  
Author(s):  
Jia Hui ◽  
Daoxin Wei ◽  
Jing Chen ◽  
Zhou Yang
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
Composite Electrode ◽  
Low Cost ◽  
Electrochemical Performances ◽  
Carbon Cloth ◽  
Composite Electrodes ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
One Step

Carbon materials have been widely used in designing supercapacitors (SCs) but the capacitance is not ideal. Herein, we synthesize polyaniline (PANI) nanotubes on the basis of a carbon cloth (CC) through a one-step self-degradation template method, and fabricate a CC@PANI NTs-H (CC@PANI nanotubes doping at high temperature) composite electrode by thermal acid doping. The CC@PANI NTs-H electrode obviously exhibits better electrochemical performance with a gravimetric capacitance of 438 F g−1 and maintains 86.8% after 10,000 cycles than the CC@PANI NTs-R (CC@PANI nanotubes doping at room temperature) electrode. Furthermore, we assemble a flexible solid state supercapacitor (FSSC) device with the as-prepared CC@PANI NTs-H composite electrodes, showing good flexibility and outstanding electrochemical performances with a high gravimetric capacitance of 247 F g−1, a large energy density of 21.9 Wh kg−1, and a capacitance retention of 85.4% after 10,000 charge and discharge cycles. Our work proposes a novel and easy pathway to fabricate low-cost FSSCs for the development of energy storage devices.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

Dislocation structures around SiO2 Particles in aged Cu-Cr-SiO2

1978 ◽  
Vol 36 (1) ◽  
pp. 594-595
Author(s):  
N.J. Long ◽  
M.H. Loretto ◽  
C.H. Lloyd
Keyword(s):  
Flow Stress ◽  
Single Crystals ◽  
Room Temperature ◽  
Thin Foil ◽  
Age Hardening ◽  
Dispersion Strengthening ◽  
Accurate Picture ◽  
The Matrix ◽  
Very High ◽  
Good Agreement

IntroductionThere have been several t.e.m. studies (1,2,3,4) of the dislocation arrangements in the matrix and around the particles in dispersion strengthened single crystals deformed in single slip. Good agreement has been obtained in general between the observed structures and the various theories for the flow stress and work hardening of this class of alloy. There has been though some difficulty in obtaining an accurate picture of these arrangements in the case when the obstacles are large (of the order of several 1000's Å). This is due to both the physical loss of dislocations from the thin foil in its preparation and to rearrangement of the structure on unloading and standing at room temperature under the influence of the very high localised stresses in the vicinity of the particles (2,3).This contribution presents part of a study of the Cu-Cr-SiO2 system where age hardening from the Cu-Cr and dispersion strengthening from Cu-Sio2 is combined.

ESEM - A multipurpose surface Electron Microscope

1986 ◽  
Vol 44 ◽  
pp. 632-633 ◽  
Author(s):  
G.D. Danilatos
Keyword(s):  
Electron Microscope ◽  
Room Temperature ◽  
Environmental Scanning ◽  
Gas Composition ◽  
Saturated Water Vapor ◽  
Surface Electron ◽  
Current State ◽  
Saturated Water ◽  
New Type ◽  
Temperature And Pressure

Over recent years a new type of electron microscope - the environmental scanning electron microscope (ESEM) - has been developed for the examination of specimen surfaces in the presence of gases. A detailed series of reports on the system has appeared elsewhere. A review summary of the current state and potential of the system is presented here.The gas composition, temperature and pressure can be varied in the specimen chamber of the ESEM. With air, the pressure can be up to one atmosphere (about 1000 mbar). Environments with fully saturated water vapor only at room temperature (20-30 mbar) can be easily maintained whilst liquid water or other solutions, together with uncoated specimens, can be imaged routinely during various applications.

Dual Nickel/Palladium-Catalyzed Reductive Cross-Coupling Reactions Between Two Phenol Derivatives

2020 ◽  
Author(s):  
Baojian Xiong ◽  
Yue Li ◽  
Yin Wei ◽  
Søren Kramer ◽  
Zhong Lian
Keyword(s):  
Functional Group ◽  
Low Cost ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Phenol Derivatives ◽  
Cross Coupling Reactions ◽  
Palladium Catalyzed ◽  
One Step ◽  
Aryl Tosylates ◽  
Low Sensitivity

Cross-coupling between substrates that can be easily derived from phenols is highly attractive due to the abundance and low cost of phenols. Here, we report a dual nickel/palladium-catalyzed reductive cross-coupling between aryl tosylates and aryl triflates; both substrates can be accessed in just one step from readily available phenols. The reaction has a broad functional group tolerance and substrate scope (>60 examples). Furthermore, it displays low sensitivity to steric effects demonstrated by the synthesis of a 2,2’disubstituted biaryl and a fully substituted aryl product. The widespread presence of phenols in natural products and pharmaceuticals allow for straightforward late-stage functionalization, illustrated with examples such as Ezetimibe and tyrosine. NMR spectroscopy and DFT calculations indicate that the nickel catalyst is responsible for activating the aryl triflate, while the palladium catalyst preferentially reacts with the aryl tosylate.

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