scholarly journals Controlled Aggregation of Peptide Substituted Perylene-Bisimides

2021 ◽  
Author(s):  
◽  
Joseph Keith Gallaher
Keyword(s):  
Materials Science ◽  
Electronic Device ◽  
Water Concentration ◽  
Building Blocks ◽  
High Water ◽  
Device Fabrication ◽  
Fine Tuning ◽  
Peptide Sequence ◽  
Molecular Semiconductor ◽  
Perylene Bisimides

<p>In recent years there has been an intersection of supramolecular chemistry and materials science, with a particular focus on the controlled self-assembly of functional building blocks. The impetus for assembly of organised architectures is a requirement due to organic electronic device performance being sensitive to the geometric configuration of adjacent molecular semiconductors, interacting by means of overlapping π-orbitals to create electronic conduction. Inspired by the formation of elegant supramolecular structures in nature, this work employs perylene bisimides coupled to synthetic peptides which are able to control the assembly of chromophores in solution. Through examining the perturbations of optical absorption and fluorescence spectroscopic signatures, the presence of aggregates, and also the geometric configurations of adjacent chromophores are determined. By exploring these features as a function of peptide design, pH, solvent composition, and ionic strength, it is demonstrated that aggregation is strongly induced by the peptide and the aromatic core, with significant dependence on the electrostatic repulsion between peptide segments. By manipulating solvent compositions, we demonstrate the ability to induce controlled reorganisation of aggregates through the introduction of charge onto the peptide sequence in high water concentration solution. Furthermore, application of the exciton model to absorption spectra establishes the tuneability of aggregates by specific ion binding between neighbouring peptides. Our results demonstrate the capability of peptide sequences to drive aggregation of molecular semiconductor building blocks; moreover, the peptides allow fine tuning of the electronic overlap between neighbouring building blocks. The proof of concept paves the way for further investigation into utilising this assembly control for device fabrication, in particular, we see this work being applicable to biosensor devices.</p>

scholarly journals Controlled Aggregation of Peptide Substituted Perylene-Bisimides

2021 ◽  
Author(s):  
◽  
Joseph Keith Gallaher
Keyword(s):  
Materials Science ◽  
Electronic Device ◽  
Water Concentration ◽  
Building Blocks ◽  
High Water ◽  
Device Fabrication ◽  
Fine Tuning ◽  
Peptide Sequence ◽  
Molecular Semiconductor ◽  
Perylene Bisimides

<p>In recent years there has been an intersection of supramolecular chemistry and materials science, with a particular focus on the controlled self-assembly of functional building blocks. The impetus for assembly of organised architectures is a requirement due to organic electronic device performance being sensitive to the geometric configuration of adjacent molecular semiconductors, interacting by means of overlapping π-orbitals to create electronic conduction. Inspired by the formation of elegant supramolecular structures in nature, this work employs perylene bisimides coupled to synthetic peptides which are able to control the assembly of chromophores in solution. Through examining the perturbations of optical absorption and fluorescence spectroscopic signatures, the presence of aggregates, and also the geometric configurations of adjacent chromophores are determined. By exploring these features as a function of peptide design, pH, solvent composition, and ionic strength, it is demonstrated that aggregation is strongly induced by the peptide and the aromatic core, with significant dependence on the electrostatic repulsion between peptide segments. By manipulating solvent compositions, we demonstrate the ability to induce controlled reorganisation of aggregates through the introduction of charge onto the peptide sequence in high water concentration solution. Furthermore, application of the exciton model to absorption spectra establishes the tuneability of aggregates by specific ion binding between neighbouring peptides. Our results demonstrate the capability of peptide sequences to drive aggregation of molecular semiconductor building blocks; moreover, the peptides allow fine tuning of the electronic overlap between neighbouring building blocks. The proof of concept paves the way for further investigation into utilising this assembly control for device fabrication, in particular, we see this work being applicable to biosensor devices.</p>

In situ TEM of silicon oxidation

1992 ◽  
Vol 50 (1) ◽  
pp. 324-325
Author(s):  
J. Murray Gibson ◽  
F.M. Ross ◽  
R.D. Twesten
Keyword(s):  
Materials Science ◽  
Oxidation Process ◽  
Electronic Device ◽  
Model System ◽  
Device Fabrication ◽  
In Situ Tem ◽  
Important Process ◽  
Silicon Oxidation ◽  
Electronic Device Fabrication

Oxidation is an important process in materials science. Silicon oxidation is particularly relevant for electronic device fabrication, but it also provides a model system. We report here the use of in-situ TEM for the examination of the microstructural details of the oxidation process.

Investigation of Au SAMs Photoclick Derivatization by PM-IRRAS

2019 ◽  
Author(s):  
Mark Workentin ◽  
François Lagugné-Labarthet ◽  
Sidney Legge
Keyword(s):  
Cell Adhesion ◽  
Self Assembly ◽  
Materials Science ◽  
Fibroblast Cell ◽  
Fine Tuning ◽  
Chemical System ◽  
Infrared Reflection ◽  
Assembled Monolayers ◽  
One Step ◽  
High Degree

In this work we present a clean one-step process for modifying headgroups of self-assembled monolayers (SAMs) on gold using photo-enabled click chemistry. A thiolated, cyclopropenone-caged strained alkyne precursor was first functionalized onto a flat gold substrate through self-assembly. Exposure of the cyclopropenone SAM to UV-A light initiated the efficient photochemical decarbonylation of the cyclopropenone moiety, revealing the strained alkyne capable of undergoing the interfacial strain-promoted alkyne-azide cycloaddition (SPAAC). Irradiated SAMs were derivatized with a series of model azides with varied hydrophobicity to demonstrate the generality of this chemical system for the modification and fine-tuning of the surface chemistry on gold substrates. SAMs were characterized at each step with polarization-modulation infrared reflection-absorption spectroscopy (PM-IRRAS) to confirm successful functionalization and reactivity. Furthermore, to showcase the compatibility of this approach with biochemical applications, cyclopropenone SAMs were irradiated and modified with azide-bearing cell adhesion peptides to promote human fibroblast cell adhesion, then imaged by live cell fluorescence microscopy. Thus, the “photoclick” methodology reported here represents an improved, versatile, catalyst-free protocol that allows for a high degree of control over the modification of material surfaces, with applicability in materials science as well as biochemistry.<br>

scholarly journals Synthesis of 4-Substituted-1,2-Dihydroquinolines by Means of Gold-Catalyzed Intramolecular Hydroarylation Reaction of N-Ethoxycarbonyl-N-Propargylanilines

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3366
Author(s):  
Antonio Arcadi ◽  
Andrea Calcaterra ◽  
Giancarlo Fabrizi ◽  
Andrea Fochetti ◽  
Antonella Goggiamani ◽  
...  
Keyword(s):  
Building Blocks ◽  
Fine Tuning ◽  
Para Position ◽  
Cyclization Product ◽  
Synthetic Route ◽  
Substituted Anilines ◽  
Novel Approach ◽  
High Yields

An alternative Au(I)-catalyzed synthetic route to functionalized 1,2-dihydroquinolines is reported. This novel approach is based on the use of N-ethoxycarbonyl protected-N-propargylanilines as building blocks that rapidly undergo the IMHA reaction affording the 6-endo cyclization product in good to high yields. In the presence of N-ethoxycarbonyl-N-propargyl-meta-substituted anilines, the regiodivergent cyclization at the ortho-/para-position is achieved by the means of catalyst fine tuning.

scholarly journals Topological electronics

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Matthew J. Gilbert
Keyword(s):  
Information Processing ◽  
Physical Properties ◽  
Materials Science ◽  
Electronic Device ◽  
Condensed Matter ◽  
Topological Phases ◽  
Applied Physics ◽  
New Paradigm ◽  
Topological Materials ◽  
Device Applications

AbstractWithin the broad and deep field of topological materials, there are an ever-increasing number of materials that harbor topological phases. While condensed matter physics continues to probe the exotic physical properties resulting from the existence of topological phases in new materials, there exists a suite of “well-known” topological materials in which the physical properties are well-characterized, such as Bi2Se3 and Bi2Te3. In this context, it is then appropriate to ask if the unique properties of well-explored topological materials may have a role to play in applications that form the basis of a new paradigm in information processing devices and architectures. To accomplish such a transition from physical novelty to application based material, the potential of topological materials must be disseminated beyond the reach of condensed matter to engender interest in diverse areas such as: electrical engineering, materials science, and applied physics. Accordingly, in this review, we assess the state of current electronic device applications and contemplate the future prospects of topological materials from an applied perspective. More specifically, we will review the application of topological materials to the general areas of electronic and magnetic device technologies with the goal of elucidating the potential utility of well-characterized topological materials in future information processing applications.

DNA-based self-assembly of nanostructures

2017 ◽  
Author(s):  
Joshua D. Carter ◽  
Chenxiang Lin ◽  
Yan Liu ◽  
Hao Yan ◽  
Thomas H. LaBean
Keyword(s):  
Self Assembly ◽  
Materials Science ◽  
Directed Assembly ◽  
Building Blocks ◽  
Hierarchical Assembly ◽  
Synthetic Dna ◽  
Nanoscale Manufacturing ◽  
Covalently Linked ◽  
Design Construction ◽  
Proteins And Peptides

This article examines the DNA-based self-assembly of nanostructures. It first reviews the development of DNA self-assembly and DNA-directed assembly, focusing on the main strategies and building blocks available in the modern molecular construction toolbox, including the design, construction, and analysis of nanostructures composed entirely of synthetic DNA, as well as origami nanostructures formed from a mixture of synthetic and biological DNA. In particular, it considers the stepwise covalent synthesis of DNA nanomaterials, unmediated assembly of DNA nanomaterials, hierarchical assembly, nucleated assembly, and algorithmic assembly. It then discusses DNA-directed assembly of heteromaterials such as proteins and peptides, gold nanoparticles, and multicomponent nanostructures. It also describes the use of complementary DNA cohesion as 'smart glue' for bringing together covalently linked functional groups, biomolecules, and nanomaterials. Finally, it evaluates the potential future of DNA-based self-assembly for nanoscale manufacturing for applications in medicine, electronics, photonics, and materials science.

Zeolates: A Coordination Chemistry View of Metal-Ligand Bonding in Intrazeolite MOCVD Type Precursors and Semiconductor Nanoclusters

1992 ◽  
Vol 277 ◽  
Author(s):  
Geoffrey A. Ozin ◽  
Carol L. Bowes ◽  
Mark R. Steele
Keyword(s):  
Self Assembly ◽  
Materials Science ◽  
Zeolite Y ◽  
Chemical Vapour ◽  
Internal Surface ◽  
Building Blocks ◽  
Structural Features ◽  
Organic Chemical ◽  
Wide Range ◽  
Shape Selective

ABSTRACTVarious MOCVD (metal-organic chemical vapour deposition) type precursors and their self-assembled semiconductor nanocluster products [1] have been investigated in zeolite Y hosts. From analysis of in situ observations (FTIR, UV-vis reflectance, Mössbauer, MAS-NMR) of the reaction sequences and structural features of the precursors and products (EXAFS and Rietveld refinement of powder XRD data) the zeolite is viewed as providing a macrospheroidal, multidendate coordination environment towards encapsulated guests. By thinking about the α- and β-cages of the zeolite Y host effectively as a zeolate ligand composed of interconnected aluminosilicate “crown ether-like” building blocks, the materials chemist is able to better understand and exploit the reactivity and coordination properties of the zeolite internal surface for the anchoring and self-assembly of a wide range of encapsulated guests. This approach helps with the design of synthetic strategies for creating novel guest-host inclusion compounds having possible applications in areas of materials science such as nonlinear optics, quantum electronics, and size/shape selective catalysis.

scholarly journals Assembly of multicomponent structures from hundreds of micron-scale building blocks using optical tweezers

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Jeffrey E. Melzer ◽  
Euan McLeod
Keyword(s):  
Optical Tweezers ◽  
Three Dimensional ◽  
Building Blocks ◽  
Optical Tweezer ◽  
Device Fabrication ◽  
Positional Accuracy ◽  
Component Structure ◽  
Material Development ◽  
Critical Process Parameters ◽  
Optical Positioning

AbstractThe fabrication of three-dimensional (3D) microscale structures is critical for many applications, including strong and lightweight material development, medical device fabrication, microrobotics, and photonic applications. While 3D microfabrication has seen progress over the past decades, complex multicomponent integration with small or hierarchical feature sizes is still a challenge. In this study, an optical positioning and linking (OPAL) platform based on optical tweezers is used to precisely fabricate 3D microstructures from two types of micron-scale building blocks linked by biochemical interactions. A computer-controlled interface with rapid on-the-fly automated recalibration routines maintains accuracy even after placing many building blocks. OPAL achieves a 60-nm positional accuracy by optimizing the molecular functionalization and laser power. A two-component structure consisting of 448 1-µm building blocks is assembled, representing the largest number of building blocks used to date in 3D optical tweezer microassembly. Although optical tweezers have previously been used for microfabrication, those results were generally restricted to single-material structures composed of a relatively small number of larger-sized building blocks, with little discussion of critical process parameters. It is anticipated that OPAL will enable the assembly, augmentation, and repair of microstructures composed of specialty micro/nanomaterial building blocks to be used in new photonic, microfluidic, and biomedical devices.

O,O′-DisubstitutedN,N′-Dihydroxynaphthalenediimides (DHNDI): First Principles Designed Organic Building Blocks for Materials Science

2011 ◽  
Vol 13 (20) ◽  
pp. 5432-5435 ◽  
Author(s):  
Eric Assen B. Kantchev ◽  
Huei Shuan Tan ◽  
Tyler B. Norsten ◽  
Michael B. Sullivan
Keyword(s):  
First Principles ◽  
Materials Science ◽  
Building Blocks

Innovative Curriculum on Electronic Materials Processing and Engingeering

2001 ◽  
Vol 684 ◽  
Author(s):  
Jane P. Chang
Keyword(s):  
Semiconductor Manufacturing ◽  
Chemical Engineering ◽  
Materials Science ◽  
Semiconductor Device ◽  
Electronic Materials ◽  
Dynamic Environment ◽  
Complementary Metal Oxide Semiconductor ◽  
Device Fabrication ◽  
Oxide Semiconductor ◽  
Solid State Physics

Recognizing that the traditional engineering education training is often inadequate in preparing the students for the challanges presented by this industry's dynamic environment and insufficient to meet the empoyer's criteria in hiring new engineers, a new curriculum on Semiconductor Manufacturing is instituted in the Chemical Engineering Department at UCLA to train the students in various scientific and technologica areas that are pertinenet to the microelectronics industries. This paper describes this new mutidisciplinary curriculum that provides knowledge and skills in semiconductor manufacturing through a series ofcourses that emphasize on the application of fundamenta engineeering disciplines in solid-state physics, materials science of semiconductors, and chemical processing. The curriculum comprises three major components:(1)a comprehensive course curriculum in semiconductor manufacturing; (2) a laboratory for hands-on training in semiconductor device fabrication; (3) design of experiments. The capstone laboratory course is designed to strengthen students’ training in “unit operatins” used in semicounductor manufacturing and allow them to practice engineering principles using the state-of-the-art experimental setup. It comprises the most comprehensive training(seven photolithographic steps and numero0us chemical processes)in fabricating and testing complementary metal-oxide-semiconductor (CMOS) devices. This curriculum is recentyaccredited by the Accreditation Board for Engineering and Technology(ABET).

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