Fig 2 - uploaded by Yuanyuan Cao
Content may be subject to copyright.
HRTEM images of DTHF-1 with different tilting angles. By tilting the fibre clockwise along its long axis by 201, the channels in the yellow part (a 2 ) gradually disappeared and moved upwards to the blue part (b 3 ), indicating the right-handed arrangement of the channels, corresponding to the models (a 4 and b 4 ).
Source publication
Screw-like hierarchical chiral fibres were constructed by co-templating two building tectons, DNA and porphyrin, under the bridging effect of cationic organosilane. The chirality transfer from the DNA molecular to meso-tetra(4-sulfonatophenyl) porphyrin assemblies in turn affected the subsequent arrangement of DNA assemblies, thus indicating a mult...
Similar publications
In this paper, experimental results are presented on the deposition of colloidal gold nanoparticles on the surfaces of TiO2 prepared on silicon/silicon dioxide. Important procedures, such as titanium dioxide surface hydrophilization as well as functionalization by an organosilane coupling agent (3-aminopropyl) trimethoxysilane and (3-mercaptopropyl...
Citations
... A commonly used term for hybrid organosilane nanofibers belongs to those types of nanofibers which are composed of various combinations of organic polymers [1]; combinations of the alkoxides containing organic polymers [2][3][4] and/or inorganic nanofibers dopped with various types of surfactants [5][6][7][8][9]. So-called "hybrid organosilane nanofibers" which are already described in the literature have been mainly prepared through self-assembly techniques in the presence of various additives [5][6][7][10][11][12] not the electrospinning technique. ...
... A commonly used term for hybrid organosilane nanofibers belongs to those types of nanofibers which are composed of various combinations of organic polymers [1]; combinations of the alkoxides containing organic polymers [2][3][4] and/or inorganic nanofibers dopped with various types of surfactants [5][6][7][8][9]. So-called "hybrid organosilane nanofibers" which are already described in the literature have been mainly prepared through self-assembly techniques in the presence of various additives [5][6][7][10][11][12] not the electrospinning technique. These types of nanofibers have several disadvantages such as low mechanical resistance or decomposition with the change of the environment in which they have been formed [5,6,8,9,13,14]. ...
... So-called "hybrid organosilane nanofibers" which are already described in the literature have been mainly prepared through self-assembly techniques in the presence of various additives [5][6][7][10][11][12] not the electrospinning technique. These types of nanofibers have several disadvantages such as low mechanical resistance or decomposition with the change of the environment in which they have been formed [5,6,8,9,13,14]. They also need to be prepared with the presence of cationic surfactants [15][16][17] and/or various types of gelators [18,19]. ...
Nanofibers bring everyday challenges to modern material science. Different types of fibrous materials made of organic and/or inorganic components are well known worldwide and find applications in various fields of industry and everyday life, covering optoelectronics, energetics, sensors, catalysis, filtration and/or medicine. However, their combination in the form of hybrid nanofibers is a part of science that has not been fully discovered yet. Hybrid organic-inorganic organosilane nanofibers bring completely new, unique and extraordinary properties given by the interconnection of organic and inorganic components via strong covalent bonds between silicon and carbon. Herein, we briefly present the patented process leading to the preparation of the first purely hybrid organic-inorganic organosilane nanofibers composed of organo-bis-silylated precursor based on 4.4 ′ -bis(triethoxysilyl)-1.1 ′ -biphenyl, which were successfully prepared by a sol–gel process combined with electrospinning techniques. These hybrid nanofibers were prepared without using various types of additives such as organic polymers and/or surfactants, which are commonly used as support during the preparation of other types of nanofibers.
... Porphyrins are a kind of macromolecular heterocyclic compounds formed by the interconnection of α-carbon atoms of four pyrrole subunits through the methylene bridge (=CH−) (Wang et al., 2011). Due to their special chemical structure and electrical properties, supramolecular assembly can be carried out under certain conditions (Cao et al., 2017). In order to investigate whether it is possible to transfer the chiral signals from L-CDots and D-CDots to other achiral molecules, we discussed their non-covalent interactions with porphyrins. ...
Chirality plays a key role in many fields ranging from life to natural sciences. For a long time, chiral materials have been developed and used to interact with chiral environments. In recent years, fluorescent carbon dots (CDots) are a new class of carbon nanomaterials exhibit excellent optical properties, good biocompatibility, excellent water solubility, and low cost. However, chirality transfer between semiconductor CDots and organics remains a challenge. Herein, a facile one-step hydrothermal method was used to synthesize chiral CDs from cysteine (cys). The obtained chiral CDots can act as chiral templates to induce porphyrins to form chiral supramolecular assemblies. The successful transmission of chiral information provides more options for the development of various chiral composite materials and the preservation of chiral information in the future.
Chirality is prevalent in nature, offering unique inspirations for building functional inorganic materials. Within these intricate chiral materials, the assembly of nanoparticles as fundamental building blocks is supposed to contribute to the formation of chiral suprastructures. Herein, by a comprehensive review of various reported chiral materials recently, we systematically document the strategies for precise control of chiral materials synthesis via inorganic nanoparticle assembly, including additive-induced, template-directed, and physical field-mediated approaches. Additionally, we demonstrate the key applications of chiral assembly inorganic materials. In summary, this work likewise advances our understanding the roles of nanoparticle assembly in chiral suprastructures, which could provide important design insights into the fabrication of functional materials in structural applications.
Biomimetic chiral optoelectronic materials can be utilized in electronic devices, biosensors and artificial enzymes. Herein, this work reports the chiro‐optical properties and architectural arrangement of optoelectronic materials generated from self‐assembly of initially nonchiral oligothiophene−porphyrin derivatives and random coil synthetic peptides. The photo‐physical‐ and structural properties of the materials were assessed by absorption‐, fluorescence‐ and circular dichroism spectroscopy, as well as dynamic light scattering, scanning electron microscopy and theoretical calculations. The materials display a three‐dimensional ordered helical structure and optical activity that are observed due to an induced chirality of the optoelectronic element upon interaction with the peptide. Both these properties are influenced by the chemical composition of the oligothiophene−porphyrin derivative, as well as the peptide sequence. We foresee that our findings will aid in developing self‐assembled optoelectronic materials with dynamic architectonical accuracies, as well as offer the possibility to generate the next generation of materials for a variety of bioelectronic applications.
Porphyrins are among the most important macrocycles because they perform many essential functions in living systems and serve as building blocks in many functional materials. Incorporating the chirality into porphyrins can aid biomimetic research and the exploration of new functional materials. In this review, recent developments in chiral porphyrin assemblies are highlighted. The review is mainly divided into two sections: the different strategies for constructing chiral porphyrin assemblies and the applications. The formation of chiral porphyrin assemblies can be from porphyrin molecules substituted with chiral groups; achiral porphyrins induced by chiral additives and spontaneous deracemizations of achiral porphyrins during the assemblies. We also provide an overview of the applications of chiral porphyrin assemblies in chiral sensing, asymmetry catalysis, circularly polarized luminescence, and so on. The further challenge in the field is discussed. The study of the chiral assembly of porphyrins can aid biomimetic research and the exploration of functional materials. In this review, recent developments of chiral porphyrins assemblies are highlighted. We also provide an overview of the applications of chiral porphyrin assemblies in the fields of sensing, catalysis, and optics.
Nanomaterials together with nanotechnologies bring everyday challenges to modern material science and allow scientists worldwide to develop completely new types of unique materials having extraordinary properties. Although interest in hybrid organic-inorganic organosilane fibrous nanomaterials is rising, there is no review covering and completing the knowledge. Herein, organo-mono-silylated and organo-bis-silylated precursors were studied in detail, and synthetic strategies and outcomes were successfully applied for the formation of organosilane fibers using various different techniques such as self-assembly, drawing, and in particular electrospinning.
The presented findings are closely connected to the application potential, and show the promising prospects of these hybrid organosilane fibers in various fields of modern science and everyday life, covering optoelectronics, sensors, catalysis, energetics, filtration and medicine.
Here we described the design and synthesis of a discrete 3D amphiphilic metallacage 4, in which the tetragonal prismatic frameworks act as the hydrophobic cores and the poly(ethylene glycol) (PEG) chains as the hydrophilic tails. The structure of 4 was characterized by ¹H NMR, ³¹P NMR and electrospray ionization time-of-flight mass spectrometry (ESI-TOF-MS). Notably, 4 with its long PEG tails was subsequently ordered into micelles at a low concentration (1.20 × 10⁻⁶ mol/L) in water. As the concentration and cultivation time increased, the micelles can further self-assembly into nanofibers and nanoribbons. Considering the dynamic property of the coordination bond, these structures show reversible transformation under external stimuli.
Hierarchical structured materials represent an interesting platform for many potential applications such as separation, catalyst and drug delivery etc. However, controlled fabrication of this special structure still remains a big challenge. In the present work, a controllable sol-gel procedure was developed to precisely fabricate polysilsesquioxane particles with bowls-on-sphere structure from mixed organoalkoxysilane precursors with sodium ligninsulfonate as surfactant and polystyrene spheres as structure-directing agents. The morphology of the particles can be fine-tuned by judiciously adjusting the ratio of two silane precursors, amount of ammonia, surfactant content and polystyrene amount. The formation mechanism of spheres-on-sphere structured polysilsesquioxane particles was explored.
In this work, we report the synthesis of silica nanomaterials with controllable architectures using self‐assembling peptides as templates. We utilized three different peptides, including ferrocene‐L‐Phe‐OH (Fc−F), ferrocene‐L‐Phe‐L‐Phe‐OH (Fc‐FF) and ferrocene‐L‐Phe‐L‐Phe‐L‐Phe‐OH (Fc‐FFF). These peptides could self‐assemble in aqueous solution to form one‐dimensional (1D) nanostructures, such as nanofibers and nanohelices. By incorporating tetraethoxysilane (TEOS) and co‐structure directing agent N‐trimethoxysilylpropyl‐N, N, N‐trimethylammonium chloride (TMAPS), we could control the condensation and mineralization of the silica precursors with the self‐assembled peptide nanostructures. This led to the formation of a series of silica nanostructures, including nanotubes, nanohelices and mesoporous silica nanofibers. The morphology of the silica nanostructures could be controlled by changing the length of the peptide sequence, pH, solvents and counterions. The results outline a strategy for the fabrication of well‐ordered silica nanomaterials, which is of significance for the practical applications in biosensing, catalysis and drug delivery.
