Bio-Inspired Processing of Ceramic Materials

2006 ◽  
Vol 45 ◽  
pp. 643-651 ◽  
Author(s):  
Joachim Bill
Keyword(s):  
Organic Molecules ◽  
Materials Science ◽  
Ceramic Materials ◽  
Research Field ◽  
Self Assembled Monolayers ◽  
Ambient Conditions ◽  
Ceramic Synthesis ◽  
New Synthesis ◽  
Assembled Monolayers ◽  
Living Nature

Ceramic processing without firing, sintering and expensive equipment represents a growing research field within materials science. With respect to the search of new synthesis pathways living nature provides paradigms for procedures that occur at ambient conditions and by apparently simple means. In this connection, biomineralization yields highly complex organic/inorganic structures, e. g. within nacre or bones. In general, the formation of these biominerals involves organic molecules that act as templates during the mineralization of inorganic phases. Bio-inspired ceramic synthesis aims to imitate such principles by technical means. Accordingly, these routes consider the template-induced formation and the structural design of ceramics from solutions of suitable metal salts. This paper describes such routes by means of the preparation of ceramics like titania, vanadia, and zinc oxide. The influence of (bio)organic molecules (e. g. polyelectrolytes, self-assembled monolayers, amino acids, peptides and proteins) on the micro- and nanostructure formation and on the evolution of the morphology of these solids will be discussed. Furthermore, mechanical as well as functional properties of the obtained architectures are treated.

scholarly journals Nanocarbon from Rocket Fuel Waste: The Case of Furfuryl Alcohol-Fuming Nitric Acid Hypergolic Pair

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 1
Author(s):  
Nikolaos Chalmpes ◽  
Athanasios B. Bourlinos ◽  
Smita Talande ◽  
Aristides Bakandritsos ◽  
Dimitrios Moschovas ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Furfuryl Alcohol ◽  
Materials Science ◽  
Ambient Conditions ◽  
Materials Synthesis ◽  
Rocket Fuel ◽  
Carbon Nanosheets ◽  
New Synthesis ◽  
Fuming Nitric Acid ◽  
Liquid Rocket

In hypergolics two substances ignite spontaneously upon contact without external aid. Although the concept mostly applies to rocket fuels and propellants, it is only recently that hypergolics has been recognized from our group as a radically new methodology towards carbon materials synthesis. Comparatively to other preparative methods, hypergolics allows the rapid and spontaneous formation of carbon at ambient conditions in an exothermic manner (e.g., the method releases both carbon and energy at room temperature and atmospheric pressure). In an effort to further build upon the idea of hypergolic synthesis, herein we exploit a classic liquid rocket bipropellant composed of furfuryl alcohol and fuming nitric acid to prepare carbon nanosheets by simply mixing the two reagents at ambient conditions. Furfuryl alcohol served as the carbon source while fuming nitric acid as a strong oxidizer. On ignition the temperature is raised high enough to induce carbonization in a sort of in-situ pyrolytic process. Simultaneously, the released energy was directly converted into useful work, such as heating a liquid to boiling or placing Crookes radiometer into motion. Apart from its value as a new synthesis approach in materials science, carbon from rocket fuel additionally provides a practical way in processing rocket fuel waste or disposed rocket fuels.

Semiconductor self-assembled monolayers as selective contacts for efficient PiN perovskite solar cells

2019 ◽  
Vol 12 (1) ◽  
pp. 230-237 ◽  
Author(s):  
E. Yalcin ◽  
M. Can ◽  
C. Rodriguez-Seco ◽  
E. Aktas ◽  
R. Pudi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Molecules ◽  
Perovskite Solar Cells ◽  
Hole Transport ◽  
Self Assembled Monolayers ◽  
Lead Iodide ◽  
Assembled Monolayers ◽  
Type Contact ◽  
Self Assembled ◽  
P Type

Herein, we studied the use of two different Self Assembled Monolayers (SAMs) made of semiconductor hole transport organic molecules to replace the most common p-type contact, PEDOT:PSS, in PiN methyl ammonium lead iodide perovskite solar cells (PSCs).

scholarly journals Adsorption and desorption of self-assembled L-cysteine monolayers on nanoporous gold monitored by in situ resistometry

2019 ◽  
Vol 10 ◽  
pp. 2275-2279
Author(s):  
Elisabeth Hengge ◽  
Eva-Maria Steyskal ◽  
Rupert Bachler ◽  
Alexander Dennig ◽  
Bernd Nidetzky ◽  
...  
Keyword(s):  
Gold Surface ◽  
Research Field ◽  
Nanoporous Gold ◽  
Self Assembled Monolayers ◽  
Initial Surface ◽  
Resistance Change ◽  
Adsorption And Desorption ◽  
Assembled Monolayers ◽  
Self Assembled

Surface modifications of nanoporous metals have become a highly attractive research field as they exhibit great potential for various applications, especially in biotechnology. Using self-assembled monolayers is one of the most promising approaches to modify a gold surface. However, only few techniques are capable of characterizing the formation of these monolayers on porous substrates. Here, we present a method to in situ monitor the adsorption and desorption of self-assembled monolayers on nanoporous gold by resistometry, using cysteine as example. During the adsorption an overall relative change in resistance of 18% is detected, which occurs in three distinct stages. First, the cysteine molecules are adsorbed on the outer surface. In the second stage, they are adsorbed on the internal surfaces and in the last stage the reordering accompanied by additional adsorption takes place. The successful binding of cysteine on the Au surface was confirmed by cyclic voltammetry, which showed a significant decrease of the double-layer capacitance. Also, the electrochemically controlled desorption of cysteine was monitored by concomitant in situ resistometry. From the desorption peak related to the (111) surface of the structure, which is associated with a resistance change of 4.8%, an initial surface coverage of 0.48 monolayers of cysteine could be estimated.

A Progress in Gold Nanoparticles: Adsorption Behavior

2012 ◽  
Vol 557-559 ◽  
pp. 530-533
Author(s):  
Da Ming Ban ◽  
Ze Quan Liu ◽  
Yang Min
Keyword(s):  
Gold Nanoparticles ◽  
Adsorption Kinetics ◽  
Organic Molecules ◽  
Adsorption Behavior ◽  
Self Assembled Monolayers ◽  
Adsorption Characteristics ◽  
Semiconductor Crystals ◽  
Assembled Monolayers ◽  
Recent Developments ◽  
Kinetics Of

This perspective reviews recent developments in the adsorption behavior and the adsorption kinetics of gold nanoparticles(AuNPs),with emphasis on papers initiating the developments and with an eye to their consequences. The aspect adsorption behavior of organic molecules on AuNPs have included the adsorption pattern of thionine, 1,4-PDI , 4-Methoxypyr-idine, 1,2,3-triazole and SH-PEG5K and the influence of adsorption. The aspect adsorption characteristics of biomolecules on AuNPs have included the adsorption kinetics of single-stranded DNA and proteins on the AuNPs. The last key aspect adsorption AuNPs on self-assembled monolayers have included the adsorption kinetics of AuNPs on different SAMs and semiconductor crystals.

scholarly journals Shape, Size and Morphology Control of Inorganic Crystals With Self-Assembled Monolayers

2004 ◽  
Vol 823 ◽  
Author(s):  
Yong-Jin Han ◽  
Joanna Aizenberg
Keyword(s):  
Organic Molecules ◽  
Nucleation And Growth ◽  
Self Assembled Monolayers ◽  
Careful Selection ◽  
Inorganic Crystals ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Size And Morphology ◽  
Size And Morphology Control ◽  
Selection Of

AbstractSelf-assembled monolayers (SAMs) provide simple, yet sophisticated surfaces to mimic the effect of proteins associated with the process of biomineralization. A careful selection of organic molecules with an appropriate surface chemistry (i.e. HS-(CH2)n-X− supported on a metal surface) allows the nucleation and growth of oriented calcite crystals and provides opportunities to study the formation of inorganic crystals assisted by organic molecules. We have successfully crystallized calcite crystals on different SAMs in the presence of additives such as proteins and/or ions in solution, and found correlations between the orientations of crystals to their final shapes, sizes and morphologies. We report here our experimental results demonstrating how underlying organic molecules along with inorganic additives can control and mold the final shape, size and morphology of calcium carbonate crystals

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