Highly Ordered Conjugated Polymer Nanoarchitectures with Three-Dimensional Structural Control

Nano Letters ◽  
2009 ◽  
Vol 9 (8) ◽  
pp. 2838-2843 ◽  
Author(s):  
Alexandru Vlad ◽  
Constantin Augustin Dutu ◽  
Pierre Guillet ◽  
Piotr Jedrasik ◽  
Charles-André Fustin ◽  
...  
Keyword(s):  
Conjugated Polymer ◽  
Structural Control ◽  
Three Dimensional

Scanning-tunneling spectroscopy on conjugated polymer films

2003 ◽  
Vol 771 ◽  
Author(s):  
M. Kemerink ◽  
S.F. Alvarado ◽  
P.M. Koenraad ◽  
R.A.J. Janssen ◽  
H.W.M. Salemink ◽  
...  
Keyword(s):  
Polymer Films ◽  
Conjugated Polymer ◽  
Three Dimensional ◽  
Field Enhancement ◽  
Direct Consequence ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Band Alignment ◽  
Scanning Tunneling ◽  
Order Of Magnitude

AbstractScanning-tunneling spectroscopy experiments have been performed on conjugated polymer films and have been compared to a three-dimensional numerical model for charge injection and transport. It is found that field enhancement near the tip apex leads to significant changes in the injected current, which can amount to more than an order of magnitude, and can even change the polarity of the dominant charge carrier. As a direct consequence, the single-particle band gap and band alignment of the organic material can be directly obtained from tip height-voltage (z-V) curves, provided that the tip has a sufficiently sharp apex.

scholarly journals Synthesis and characterization of a new conjugated polymer containing bithiazole group and its thermal decomposition kinetics

2020 ◽  
Vol 39 (2) ◽  
pp. 227
Author(s):  
Adnan Kurt ◽  
Hacer Andan ◽  
Murat Koca
Keyword(s):  
Thermal Decomposition ◽  
Heating Rate ◽  
Conjugated Polymer ◽  
Three Dimensional ◽  
Heating Rates ◽  
Diffusion Type ◽  
Optimum Heating ◽  
Rate Loss ◽  
Kinetics Of

A new conjugated polymer containing a bithiazole group is prepared by the polycondensation of 2,2'-diamino-4,4'-bithiazole and terephthaldialdehyde in the presence of glacial acetic acid. The kinetics of thermal degradation of the new polymer are investigated by thermogravimetric analysis at different heating rates. The temperature corresponding to the maximum rate loss shifts to higher temperatures with increasing heating rate. The thermal decomposition activation energies of the conjugated polymer in a conversion range of 3–15 % are 288.4 and 281.1 kJ/mol by the Flynn–Wall–Ozawa and Kissinger methods, respectively. The Horowitz–Metzger method shows that the thermodegradation mechanism of the conjugated polymer proceeds over a three-dimensional diffusion type deceleration D3 mechanism. The optimum heating rate is 20 ºC/min.

scholarly journals Porous cage-derived nanomaterial inks for direct and internal three-dimensional printing

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Tangi Aubert ◽  
Jen-Yu Huang ◽  
Kai Ma ◽  
Tobias Hanrath ◽  
Ulrich Wiesner
Keyword(s):  
3D Printing ◽  
Structural Control ◽  
High Surface ◽  
High Surface Area ◽  
Three Dimensional ◽  
Processing Technique ◽  
Advanced Materials ◽  
Host Matrix ◽  
Digital Light Processing ◽  
Three Dimensional Printing

Abstract The convergence of 3D printing techniques and nanomaterials is generating a compelling opportunity space to create advanced materials with multiscale structural control and hierarchical functionalities. While most nanoparticles consist of a dense material, less attention has been payed to 3D printing of nanoparticles with intrinsic porosity. Here, we combine ultrasmall (about 10 nm) silica nanocages with digital light processing technique for the direct 3D printing of hierarchically porous parts with arbitrary shapes, as well as tunable internal structures and high surface area. Thanks to the versatile and orthogonal cage surface modifications, we show how this approach can be applied for the implementation and positioning of functionalities throughout 3D printed objects. Furthermore, taking advantage of the internal porosity of the printed parts, an internal printing approach is proposed for the localized deposition of a guest material within a host matrix, enabling complex 3D material designs.

Structural control of silver(I) coordination polymers: construction of two- and three-dimensional frameworks of silver(I) ions bridged by dicyanopyrazine derivatives

2000 ◽  
Vol 308 (1-2) ◽  
pp. 17-21 ◽  
Author(s):  
Yusaku Suenaga* ◽  
Toru Kamiya ◽  
Takayoshi Kuroda-Sowa ◽  
Masahiko Maekawa ◽  
Megumu Munakata*
Keyword(s):  
Coordination Polymers ◽  
Structural Control ◽  
Three Dimensional

scholarly journals Structural control of englacial conduits in the temperate Matanuska Glacier, Alaska, USA

2009 ◽  
Vol 55 (192) ◽  
pp. 681-690 ◽  
Author(s):  
Jason Gulley
Keyword(s):  
Structural Control ◽  
Three Dimensional ◽  
Structural Features ◽  
Principal Stresses ◽  
Overburden Pressure ◽  
Matanuska Glacier

AbstractFourteen englacial conduits were mapped within 2 km of the terminus of the temperate Matanuska Glacier, Alaska, USA, to ice depths of 65 m using speleological techniques. Detailed three-dimensional maps of the conduits were made over 3 years to characterize conduit relationships with glacier structural features and to track conduit evolution through time. All conduits consisted of single unbranching passages that followed fractures in the ice. All conduits were either too constricted to continue or became water-filled at their deepest explored point and were not able to be followed to the glacier bed. Conduit morphology varied systematically with the orientation of the glacier principal stresses, allowing them to be categorized into two broad classes. The first class of conduits were formed by hydrostatic crevasse penetration where a large supraglacial stream intersected longitudinal crevasses. These conduits plunged toward the glacier bed at angles of 30–40°. The second class of conduits formed where smaller streams sank into the glacier on shear crevasses. Many of these conduits changed direction dramatically where they intersected transverse crevasses at depth. These results suggest that the conduits observed in this study formed along fractures and, over their surveyed length, were not affected by gradients in ice overburden pressure.

Spatial Characteristics of Acoustic Boundary Control for Interior Noise Suppression

1997 ◽  
Author(s):  
S. M. Hirsch ◽  
J. Q. Sun
Keyword(s):  
Boundary Control ◽  
Structural Control ◽  
Relative Phase ◽  
Noise Suppression ◽  
Three Dimensional ◽  
Interesting Phenomenon ◽  
Spatial Characteristics ◽  
Structural Controls ◽  
Low Dimensionality ◽  
Boundary Controls

Abstract Suppressing interior sound radiation in aircraft and automobiles is a important problem. There are two mainstream methods for this problem: active noise cancellation (ANC) and active structural acoustic controls (ASAC). An ANC system often requires a high dimensionality to achieve the level of global noise reduction in a three dimensional volume that ASAC systems with a relatively low dimensionality are capable of, while actuators for structural control systems are power intensive. There are also concerns that structural controls may cause damages to the structure. This paper develops an acoustic boundary actuation method that may retain the advantages of both methods. Steady-state optimal noise control in a rectangular enclosure is studied by using the proposed method. Simulation results are presented to demonstrate the ability of acoustic boundary controls to cancel noise fields due to various sources. A study of the spatial characteristics of the acoustic boundary control as a function of frequency and relative phase of disturbances is also presented. Numerical simulations uncover an interesting phenomenon on the variation of the optimal control vector which may have significant implications to the actuator grouping studies.

Complex landslide behaviour and structural control: a three-dimensional conceptual model of Åknes rockslide, Norway

2011 ◽  
Vol 351 (1) ◽  
pp. 147-161 ◽  
Author(s):  
Michel Jaboyedoff ◽  
Thierry Oppikofer ◽  
Marc-Henri Derron ◽  
Lars Harald Blikra ◽  
Martina Böhme ◽  
...  
Keyword(s):  
Conceptual Model ◽  
Structural Control ◽  
Three Dimensional ◽  
Complex Landslide

scholarly journals Structural control of englacial drainage systems in Himalayan debris-covered glaciers

2007 ◽  
Vol 53 (182) ◽  
pp. 399-412 ◽  
Author(s):  
J. Gulley ◽  
D.I. Benn
Keyword(s):  
Structural Control ◽  
Three Dimensional ◽  
Karst Hydrology ◽  
Near Surface ◽  
Base Level ◽  
Supraglacial Lakes ◽  
Three Dimensional Mapping ◽  
Himalayan Glaciers ◽  
Karst Landscapes ◽  
Englacial Drainage

AbstractEnglacial cave systems were mapped using speleological techniques in three debris-covered glaciers in the Khumbu Himal, Nepal. Detailed three-dimensional mapping of the cave systems and observations of relationships with structures in the surrounding ice show conduits formed by a mechanism directly analogous to speleogenesis in limestone karst. The highest, oldest parts of all passages developed along debris-filled crevasse traces with hydraulic conductivity in the range 10–4 to 10–5ms–1. Conduits form when these hydraulically efficient pathways bridge between areas with different hydraulic potential. They then evolve by grading (through head-ward migration of nick points and vertical incision) to local base level, often the surface of supraglacial lakes. Most supraglacial lakes on Himalayan glaciers are perched above the elevation of the terminal stream, and exist for a few years before draining through englacial conduits. As a result, near-surface drainage evolution is frequently interrupted by base-level fall, and conduits may record multiple phases of incision. Conduits commonly migrate laterally during incision, undermining higher levels of the ice and encouraging collapse. Voids can be created by fluvial processes and collapse of crevassed ice. The oft-noted resemblance of the surface morphology of debris-covered glaciers to karst landscapes thus extends to the subsurface, and karst hydrology provides a framework for understanding englacial drainage.

Structural Control of Copper(I) Coordination Polymers:  Construction of One-, Two-, and Three-Dimensional Frameworks of Tetrahedral Copper(I) Ions Bridged by Dicyanobenzene Derivatives

1997 ◽  
Vol 36 (27) ◽  
pp. 6382-6389 ◽  
Author(s):  
Takayoshi Kuroda-Sowa ◽  
Takashi Horino ◽  
Mikiko Yamamoto ◽  
Yasuhiro Ohno ◽  
Masahiko Maekawa ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Structural Control ◽  
Three Dimensional

Optimal Design and Practical Considerations of Tuned Mass Dampers for Structural Control

2013 ◽  
pp. 126-149
Author(s):  
Chi-Chang Lin ◽  
Jer-Fu Wang
Keyword(s):  
Numerical Simulation ◽  
Structural Control ◽  
Three Dimensional ◽  
Design Procedure ◽  
Experimental Tests ◽  
Movement Direction ◽  
Empirical Formulas ◽  
Tuned Mass Dampers ◽  
Structure Interaction ◽  
Building Models

The design concept and procedure for tuned mass dampers (TMDs) have been extensively investigated through numerical simulation analyses and experimental tests. Sophisticated three-dimensional building models were developed to examine the optimum installation location in elevation and in plane, number and movement direction of the TMDs with the consideration of translation-torsion coupling and soil-structure interaction effects. Analytical and empirical formulas were also derived to determine the optimal parameters of TMD. It is well recognized that the performance of a TMD is sensitive to the slight deviation of frequency ratio between the TMD and the structure. Multiple tuned mass dampers (MTMDs) were proposed to reduce this detuning effect. It is also recognized that TMD’s performance relies on its large stroke which may not be allowed due to the limitation of space and vibration components. The authors presented a two-stage optimum design procedure for MTMDs with limitation of their strokes. New invention patents both in Taiwan and in USA have been granted for the MTMD device.

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