Chain Tilt and Surface Disorder in Lamellar Crystals. A FTIR and SAXS Study of Labeled Long Alkanes

2002 ◽  
Vol 35 (20) ◽  
pp. 7730-7741 ◽  
Author(s):  
D. Sujeewa M. de Silva ◽  
Xiang-bing Zeng ◽  
Goran Ungar ◽  
Stephen J. Spells
Keyword(s):  
Surface Disorder ◽  
Lamellar Crystals ◽  
Chain Tilt

Emergence of size induced metallic state in the ferromagnetic insulating Pr0.8Sr0.2MnO3 manganite: Breaking of surface polarons

2015 ◽  
Vol 8 (2) ◽  
pp. 2084-2093 ◽  
Author(s):  
PROLOY TARAN DAS ◽  
Arun Kumar Nigam ◽  
Tapan Kumar Nath
Keyword(s):  
Transport Properties ◽  
Metallic State ◽  
Temperature Dependent ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
System A ◽  
Surface Disorder ◽  
Bulk System ◽  
Magnetic Transport ◽  
Grain Surface

Nano-dimensional effects on electronic-, magneto-transport properties of granular ferromagnetic insulating (FMI) Pr0.8Sr0.2MnO3 (PSMO) manganite (down to 40 nm) have been investigated in details. From the electronic and magnetic transport properties, a metallic state has been observed in grain size modulation by suppressing the ferromagnetic insulating state of PSMO bulk system. A distinct metal-insulator transition (MIT) temperature around 150 K has been observed in all nanometric samples. The observed insulator to metallic transition with size reduction can be explained with surface polaron breaking model, originates due to enhanced grain surface disorder. This proposed phenomenological polaronic model plays a significant role to understand the polaronic destabilization process on the grain surface regime of these phase separated nano-mangnatie systems. Temperature dependent resistivity and magnetoresistance data in presence of external magnetic fields are investigated in details with various compatible models.

scholarly journals Nanowires with surface disorder: Giant localization length and dynamical tunneling in the presence of directed chaos

2009 ◽  
Vol 80 (24) ◽  
Author(s):  
J. Feist ◽  
A. Bäcker ◽  
R. Ketzmerick ◽  
J. Burgdörfer ◽  
S. Rotter
Keyword(s):  
Localization Length ◽  
Surface Disorder

scholarly journals Non-Linear Thermoelectric Devices with Surface-Disordered Nanowires

Applied Nano ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 162-183
Author(s):  
Peter Markoš ◽  
Khandker Muttalib
Keyword(s):  
Thermodynamic Parameters ◽  
Power Output ◽  
Heat Current ◽  
Linear Regime ◽  
Thermoelectric Devices ◽  
Charge Current ◽  
Thermal Current ◽  
Surface Disorder ◽  
Non Linear

We reviewed some recent ideas to improve the efficiency and power output of thermoelectric nano-devices. We focused on two essentially independent aspects: (i) increasing the charge current by taking advantage of an interplay between the material and the thermodynamic parameters, which is only available in the non-linear regime; and (ii) decreasing the heat current by using nanowires with surface disorder, which helps excite localized phonons at random positions that can strongly scatter the propagating phonons carrying the thermal current.

scholarly journals Synergetic Enhancement of Light Harvesting and Charge Separation over Surface-Disorder-Engineered TiO 2 Photonic Crystals

Chem ◽  
2017 ◽  
Vol 2 (6) ◽  
pp. 877-892 ◽  
Author(s):  
Jinmeng Cai ◽  
Moqing Wu ◽  
Yating Wang ◽  
Hao Zhang ◽  
Ming Meng ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Charge Separation ◽  
Light Harvesting ◽  
Surface Disorder

Research on In Situ Anionic Polymerization of PA6/PI Alloy

2011 ◽  
Vol 295-297 ◽  
pp. 21-25
Author(s):  
Hong Kai Zhao ◽  
Li Guang Xiao ◽  
Hong Jie Wang
Keyword(s):  
Molecular Weight ◽  
Bisphenol A ◽  
High Performance ◽  
Hot Spot ◽  
Microscopic Analysis ◽  
Infrared Analysis ◽  
Elongation At Break ◽  
System Temperature ◽  
Lamellar Crystals

High performance trend of plastics has become a hot spot of current research. Select bisphenol A dianhydride and bisphenol A diamine with excellent water resistance as the reactant monomers to obtain anhydride-terminated polyimide with very high molecular weight by two-step polymerization, graft the active radicals of acyl caprolactam using the activity of anhydride and obtain PI modified nylon resin by polymerization.When the system temperature is above 160 °C and the added modifiers are greater than 10%, the system viscosity increases very fast; when the system temperature reaches 140 °C and the added modifiers are at 5%, the system viscosity increases very slowly. It is proved that the reaction in each above step is successful through infrared analysis. The mechanical properties of modified PI nylon increases with the increase of consumption and molecular weight of polyimide, when the molecular weight is selected to be about 8000~10000 and the adding amount is 10wt%~15 wt%, the tensile strength reaches over 85MPa, the notch impact strength is increased to 19.6kJ.m-2 and the elongation at break reaches 18%, which are remarkably better than general engineering plastics.Through microscopic analysis, the molecules of polyimide does not enter crystallization phase of nylon resin, but forms compact lamellar crystals existing in nylon matrix.

Self-Nucleation of β-Form Isotactic Polypropylene Lamellar Crystals in Thin Films

2021 ◽  
Author(s):  
Binghua Wang ◽  
Gang Wang ◽  
Shanshan He ◽  
Taicheng Sun ◽  
Jingbo Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Isotactic Polypropylene ◽  
Lamellar Crystals

scholarly journals Double-Twisted Helical Lamellar Crystals in a Synthetic Main-Chain Chiral Polyester Similar to Biological Polymers. Volume 32, Number 2, January 26, 1999, pp 524−527.

2000 ◽  
Vol 33 (2) ◽  
pp. 647-647
Author(s):  
Chritopher Y. Li ◽  
Donghang Yan ◽  
Stephen Z. D. Cheng ◽  
Feng Bai ◽  
Tianbai He ◽  
...  
Keyword(s):  
Main Chain ◽  
Biological Polymers ◽  
Lamellar Crystals
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