scholarly journals A New Class of Carbon Nanostructures for High‐Performance Electro‐Magnetic and ‐Chemical Barriers

2021 ◽  
pp. 2102718
Author(s):  
Jae Hui Park ◽  
Yun Ji Oh ◽  
Dong Yoon Park ◽  
Joonsik Lee ◽  
Jae Seo Park ◽  
...  
Keyword(s):  
Carbon Nanostructures ◽  
High Performance ◽  
New Class ◽  
Electro Magnetic

scholarly journals A New Class of Carbon Nanostructures for High‐Performance Electro‐Magnetic and ‐Chemical Barriers (Adv. Sci. 22/2021)

2021 ◽  
Vol 8 (22) ◽  
pp. 2170148
Author(s):  
Jae Hui Park ◽  
Yun Ji Oh ◽  
Dong Yoon Park ◽  
Joonsik Lee ◽  
Jae Seo Park ◽  
...  
Keyword(s):  
Carbon Nanostructures ◽  
High Performance ◽  
New Class ◽  
Electro Magnetic

A Bottom-Up Approach to Solution-Processed, Atomically Precise Graphitic Cylinders on Surfaces

2018 ◽  
Author(s):  
Erik Leonhardt ◽  
Jeff M. Van Raden ◽  
David Miller ◽  
Lev N. Zakharov ◽  
Benjamin Aleman ◽  
...  
Keyword(s):  
Self Assembly ◽  
Carbon Nanostructures ◽  
Carbon Nanomaterials ◽  
Circle Packing ◽  
Pyrolytic Graphite ◽  
Building Blocks ◽  
Bottom Up ◽  
Casting Technique ◽  
New Class ◽  
Solution Casting Technique

Extended carbon nanostructures, such as carbon nanotubes (CNTs), exhibit remarkable properties but are difficult to synthesize uniformly. Herein, we present a new class of carbon nanomaterials constructed via the bottom-up self-assembly of cylindrical, atomically-precise small molecules. Guided by supramolecular design principles and circle packing theory, we have designed and synthesized a fluorinated nanohoop that, in the solid-state, self-assembles into nanotube-like arrays with channel diameters of precisely 1.63 nm. A mild solution-casting technique is then used to construct vertical “forests” of these arrays on a highly-ordered pyrolytic graphite (HOPG) surface through epitaxial growth. Furthermore, we show that a basic property of nanohoops, fluorescence, is readily transferred to the bulk phase, implying that the properties of these materials can be directly altered via precise functionalization of their nanohoop building blocks. The strategy presented is expected to have broader applications in the development of new graphitic nanomaterials with π-rich cavities reminiscent of CNTs.

New Class of Trimetallic Oxide Hierarchical Mesoporous Array on Woven Fabric: Electrode for high-Performance and Stable battery type Ultracapacitor

2021 ◽  
Vol 35 ◽  
pp. 102249
Author(s):  
S. Thakur ◽  
S. Maiti ◽  
K. Sardar ◽  
N. Besra ◽  
P. Bairi ◽  
...  
Keyword(s):  
High Performance ◽  
Woven Fabric ◽  
New Class

scholarly journals Environmentally Friendly, High-Performance Fire Retardant Made from Cellulose and Graphite

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2400
Author(s):  
Leandra P. Santos ◽  
Douglas S. da Silva ◽  
Thais H. Morari ◽  
Fernando Galembeck
Keyword(s):  
High Performance ◽  
Raw Materials ◽  
Fire Retardant ◽  
Visual Observation ◽  
Flame Resistance ◽  
New Developments ◽  
New Class ◽  
New Material ◽  
Accredited Laboratory ◽  
Materials Used

Many materials and additives perform well as fire retardants and suppressants, but there is an ever-growing list of unfulfilled demands requiring new developments. This work explores the outstanding dispersant and adhesive performances of cellulose to create a new effective fire-retardant: exfoliated and reassembled graphite (ERG). This is a new 2D polyfunctional material formed by drying aqueous dispersions of graphite and cellulose on wood, canvas, and other lignocellulosic materials, thus producing adherent layers that reduce the damage caused by a flame to the substrates. Visual observation, thermal images and surface temperature measurements reveal fast heat transfer away from the flamed spots, suppressing flare formation. Pinewood coated with ERG underwent standard flame resistance tests in an accredited laboratory, reaching the highest possible class for combustible substrates. The fire-retardant performance of ERG derives from its thermal stability in air and from its ability to transfer heat to the environment, by conduction and radiation. This new material may thus lead a new class of flame-retardant coatings based on a hitherto unexplored mechanism for fire retardation and showing several technical advantages: the precursor dispersions are water-based, the raw materials used are commodities, and the production process can be performed on commonly used equipment with minimal waste.

A three-dimensional hierarchical Fe2O3@NiO core/shell nanorod array on carbon cloth: a new class of anode for high-performance lithium-ion batteries

Nanoscale ◽  
2013 ◽  
Vol 5 (17) ◽  
pp. 7906 ◽  
Author(s):  
Qin-qin Xiong ◽  
Jiang-ping Tu ◽  
Xin-hui Xia ◽  
Xu-yang Zhao ◽  
Chang-dong Gu ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
High Performance ◽  
Three Dimensional ◽  
Lithium Ion ◽  
Nanorod Array ◽  
Core Shell ◽  
Carbon Cloth ◽  
New Class

Theoretical Studies of the Physical Properties of Rodlike and Related Polymers

1988 ◽  
Vol 134 ◽  
Author(s):  
W. J. Welsh ◽  
J. E. Mark ◽  
Y. Yang ◽  
G. P. Das
Keyword(s):  
High Performance ◽  
Liquid Crystalline ◽  
Theoretical Work ◽  
Environmental Resistance ◽  
New Class ◽  
Protonated Forms ◽  
New Type ◽  
Electrooptical Properties ◽  
Cis And Trans ◽  
Strong Acids

ABSTRACTThis review focuses on a new type of para-catenated aromatic polymer being used in the preparation of high-performance films and fibers of exceptional strength, thermal stability, and environmental resistance, including inertness to essentially all common solvents. Polymers of this type include the cis- and trans-poly(p-phenylene benzobisoxazole) (PBO), the cis- and trans-forms of the corresponding poly(pphenylene benzobisthiazole) (PBT), and the structurally similar poly(5,5ʹ-bibenzoxazole-2.2ʹ-diyl-l,3-phenylene) (AAPBO) and poly(2,5-benzoxazole) (ABPBO) and their sulfurcontaining analogues. Because of their rigidity, these polymers become highly oriented in solution and some display liquid crystalline behavior. The purpose of this paper is to summarize the authorsʹ theoretical work on the structures, conformational energies, intermolecular interactions, electronic properties, electrical conductivity, and electrooptical properties of these chains, including, in some cases, the so-called articulated forms and the protonated forms known to exist in strong acids. The emphasis is on how such studies provide a molecular understanding of the unusual properties and processing characteristics of this new class of materials.

MSV(L): Continuing the Legacy of Army Waterborne Capability

2021 ◽  
Author(s):  
David Richard Toepler ◽  
Nathan Leightner
Keyword(s):  
United States ◽  
United States Army ◽  
High Performance ◽  
The United States ◽  
Engineering Management ◽  
Fourth Quarter ◽  
Detailed Design ◽  
New Class ◽  
Source Selection ◽  
Primary Mission

The United States Army operates several classes of landing craft, which provide combatant commanders with waterborne maneuver capabilities essential for accomplishing a range of critical missions unique to the Army. These missions involve transport of personnel, cargo, and equipment from advanced bases and large sealift ships to ports, inland riverine regions, as well as remote undeveloped coastlines and beaches. Recognizing the significant roles these vessels play and will continue to play in achieving Army objectives, Army leadership allocated funding to design and build a new class of high performance landing craft: Maneuver Support Vessel (Light) (MSV(L)). The primary mission of MSV(L) is to conduct movement and maneuver of combat-configured Brigade Combat Team force elements such as one M1A2 main battle tank, or two Stryker vehicles, or four Joint Light Tactical Vehicles, each with its crew. MSV(L) will have beaching capability and be able to operate at speeds significantly in excess of any current Army landing craft. The Army Watercraft Systems organization was tasked with overseeing development of requirements and specifications, source selection and acquisition, along with contract, finance, and engineering management of the MSV(L) Program. A contract to develop the detailed design and build a series of vessels was awarded in September 2017. Launch of the initial vessel is planned during the fourth quarter of 2021.

Tunable ultra-uniform Cs4PbBr6 perovskites with efficient photoluminescence and excellent stability for high-performance white light-emitting diodes

2021 ◽  
Author(s):  
Yao Li ◽  
Kaimin Du ◽  
Manli Zhang ◽  
Xuan Gao ◽  
Yu Lu ◽  
...  
Keyword(s):  
White Light ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Metal Halide ◽  
Light Emitting ◽  
New Class ◽  
Halide Perovskites ◽  
White Light Emitting Diodes ◽  
Lead Halide ◽  
Excellent Stability

Metal halide perovskites are a new class of promising materials in optoelectronic applications. As optoelectronic properties of the lead halide perovskites are determined largely by their morphology, the morphology of...

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