A multifunctional material with distinct mechanochromic and piezochromic properties: π-stacking in play

2021 ◽  
Author(s):  
Zeyang Ding ◽  
Tong Lu ◽  
Changjiang Bi ◽  
Bao Li ◽  
Shitong Zhang ◽  
...  
Keyword(s):  
Organic Crystals ◽  
Multifunctional Material ◽  
Π Stacking ◽  
Different Types

Controlling different types of forces to achieve materials with different emission responses remains challenge. In this work, polymorphic organic crystals with blue (1-B) and green (1-G) emission based on N-(4-(1-cyano-2-phenylvinyl)phenyl)benzamide...

Abrikosov-like lattices in organic crystals on graphite surface

2014 ◽  
Vol 1663 ◽  
Author(s):  
Alexandre F. Fonseca ◽  
Paulo N. Lisboa-Filho
Keyword(s):  
Small Molecules ◽  
Aromatic Hydrocarbons ◽  
Self Assembly ◽  
Surface Patterning ◽  
Organic Crystals ◽  
Spontaneous Formation ◽  
Vast Literature ◽  
Different Types ◽  
Polycyclic Aromatic ◽  
Initial Results

ABSTRACTThe interest for surface patterning presents a fast increasing in the last few years due to several factors ranging from miniaturization trends and sensor design to worries about the absorption of carcinogenic molecules on inhalable particles. Although the existence of a vast literature regarding the self-assembly and patterning of nanoparticles on different types of surfaces, it remains unclear the dynamics and main mechanisms behind the formation and maintenance of two-dimensional symmetric patterns of small molecules on top of surfaces. In this contribution, we report initial results on an investigation on the similarities between the well-known Abrikosov hexagonal lattices in superconductors, and the spontaneous formation of hexagonal patterns of some small polycyclic aromatic hydrocarbons (PAHs) on top of a graphitic surface. In order to attest our results, some experimental results from literature are compared to the obtained results.

scholarly journals Stabilization of the Surface of ZnO Films and Elimination of the Aging Effect

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6535
Author(s):  
Khabibulla A. Abdullin ◽  
Maratbek T. Gabdullin ◽  
Sultan K. Zhumagulov ◽  
Guzal A. Ismailova ◽  
Lesya V. Gritsenko ◽  
...  
Keyword(s):  
Aging Effect ◽  
Degradation Process ◽  
Zno Films ◽  
Hydrogen Passivation ◽  
Nanorod Arrays ◽  
Short Term ◽  
Surface Sites ◽  
O2 Adsorption ◽  
Multifunctional Material ◽  
Different Types

Zinc oxide is a promising multifunctional material. The practical use of nano- and polycrystalline ZnO devices faces a serious problem of instability of electrical and luminescent characteristics, due to the adsorption of oxygen by the surface during aging. In this paper, the aging effect in ZnO films and nanorod arrays was studied. It was found that ZnO samples demonstrate different behavior of the degradation process, which corresponds to at least two different types of adsorbing surface sites for O2, where O2 adsorption is of a different nature. The first type of surface sites is rapidly depassivated after hydrogen passivation and the aging effect takes place due to these centers. The second type of surface sites has a stable structure after hydrogen passivation and corresponds to HO–ZnO sites. The XPS components of these sites include the Zn2p3/2 peak at 1022.2 ± 0.2 eV and Zn2p1/2 peak at 1045.2 ± 0.2 eV, with a part of the XPS O1s peak at 531.5 ± 0.3 eV. The annealing transforms the first type of site into the second one, and the subsequent short-term plasma treatment in hydrogen results in steady passivation, where the degradation of characteristics is practically reduced to zero.

Analysis of supramolecular interactions directing crystal packing of novel mononuclear chloranilate-based complexes: Different types of hydrogen bonding and π-stacking

Polyhedron ◽  
2020 ◽  
Vol 189 ◽  
pp. 114723
Author(s):  
Lidija Kanižaj ◽  
Vedran Vuković ◽  
Emmanuel Wenger ◽  
Marijana Jurić ◽  
Krešimir Molčanov
Keyword(s):  
Hydrogen Bonding ◽  
Crystal Packing ◽  
Supramolecular Interactions ◽  
Π Stacking ◽  
Different Types

Straight, bendable and bent organic crystals

2019 ◽  
Vol 55 (98) ◽  
pp. 14749-14752 ◽  
Author(s):  
Khushboo Yadava ◽  
Xian Qin ◽  
Xiaogang Liu ◽  
Jagadese J. Vittal
Keyword(s):  
Crystal Packing ◽  
Organic Crystals ◽  
Anisotropic Crystal ◽  
Elastic Bending ◽  
Different Types

Of the three different types of crystal morphologies of trans-pab, the bent nature is attributed to the small amount of cis-form in the packing of trans-pab, while the elastic bending is due to anisotropic crystal packing.

scholarly journals Supramolecular Architecture of Chloranilate Salts with Organic Cations

2019 ◽  
Vol 92 (2) ◽  
pp. 297-305
Author(s):  
Krešimir Molčanov ◽  
Marijana Jurić ◽  
Lidija Androš Dubraja
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Organic Cations ◽  
Supramolecular Architecture ◽  
Aromatic Rings ◽  
Chloranilic Acid ◽  
Π Stacking ◽  
Different Types ◽  
1D Chains ◽  
Hydrogen Bonded

Four novel salts of chloranilic acid (H2CA; 3,6-dichloro-2,5-dihydroxy-1,4-quinone) with organic cations pyridinium (Hpy+), piperazinediium (H2ppz2+), 4,4'-bipyridinediium (H2bpy2+) and 1,10-phenanthrolinium (Hphen+) were prepared and structurally characterised: (Hpy)2CA (1), (H2ppz)CA (2), (H2bpy)CA·4H2O (3) and (Hphen)HCA·MeOH (4). Supramolecular architecture is based on extensive hydrogen bonding and π-stacking. The central motive is chloranilate dianion which acts as an acceptor of two bifurcated hydrogen bonds. Topology and dimensionality of hydrogen bonded networks can be tuned by use of different cations: thus discrete motives, 1D chains and 2D layers were observed. Three different types of π-stacks are present: aromatic stacks, quinoid stacks and stacks of alternating quinoid and aromatic rings.

scholarly journals Interplay of π-stacking and inter-stacking interactions in two-component crystals of neutral closed-shell aromatic compounds: periodic DFT study

RSC Advances ◽  
2020 ◽  
Vol 10 (47) ◽  
pp. 27899-27910 ◽  
Author(s):  
Sona M. Melikova ◽  
Alexander P. Voronin ◽  
Jaroslaw Panek ◽  
Nikita E. Frolov ◽  
Anastasia V. Shishkina ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Aromatic Compounds ◽  
Closed Shell ◽  
Dft Study ◽  
Organic Crystals ◽  
Stacking Interactions ◽  
Π Stacking ◽  
Two Component ◽  
Periodic Dft

The interplay of π-stacking and inter-stacking interactions in two-component organic crystals without conventional hydrogen bonds.

The extinction time of a general birth and death process with catastrophes

1986 ◽  
Vol 23 (04) ◽  
pp. 851-858 ◽  
Author(s):  
P. J. Brockwell
Keyword(s):  
Laplace Transform ◽  
Size Distribution ◽  
Sufficient Conditions ◽  
Necessary And Sufficient Conditions ◽  
Death Process ◽  
Extinction Time ◽  
Birth And Death Process ◽  
Different Types ◽  
The Laplace Transform ◽  
Necessary And Sufficient

The Laplace transform of the extinction time is determined for a general birth and death process with arbitrary catastrophe rate and catastrophe size distribution. It is assumed only that the birth rates satisfyλ0= 0,λj> 0 for eachj> 0, and. Necessary and sufficient conditions for certain extinction of the population are derived. The results are applied to the linear birth and death process (λj=jλ, µj=jμ) with catastrophes of several different types.

Differentiating between different forms of moral obligations

2020 ◽  
Vol 43 ◽  
Author(s):  
Rajen A. Anderson ◽  
Benjamin C. Ruisch ◽  
David A. Pizarro
Keyword(s):  
Moral Character ◽  
Moral Obligations ◽  
Different Types

Abstract We argue that Tomasello's account overlooks important psychological distinctions between how humans judge different types of moral obligations, such as prescriptive obligations (i.e., what one should do) and proscriptive obligations (i.e., what one should not do). Specifically, evaluating these different types of obligations rests on different psychological inputs and has distinct downstream consequences for judgments of moral character.

Ultrastructural Investigations of the Contractile Filaments of Amoebae

1974 ◽  
Vol 32 ◽  
pp. 188-189
Author(s):  
P.L. Moore
Keyword(s):  
Cytoplasmic Streaming ◽  
Three Dimensional ◽  
Freeze Fracture ◽  
Amoeboid Movement ◽  
Different Types ◽  
Chemical Conditions ◽  
Complete Interpretation

Previous freeze fracture results on the intact giant, amoeba Chaos carolinensis indicated the presence of a fibrillar arrangement of filaments within the cytoplasm. A complete interpretation of the three dimensional ultrastructure of these structures, and their possible role in amoeboid movement was not possible, since comparable results could not be obtained with conventional fixation of intact amoebae. Progress in interpreting the freeze fracture images of amoebae required a more thorough understanding of the different types of filaments present in amoebae, and of the ways in which they could be organized while remaining functional.The recent development of a calcium sensitive, demembranated, amoeboid model of Chaos carolinensis has made it possible to achieve a better understanding of such functional arrangements of amoeboid filaments. In these models the motility of demembranated cytoplasm can be controlled in vitro, and the chemical conditions necessary for contractility, and cytoplasmic streaming can be investigated. It is clear from these studies that “fibrils” exist in amoeboid models, and that they are capable of contracting along their length under conditions similar to those which cause contraction in vertebrate muscles.

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