Crystal Structure Engineering by Fine-Tuning the Surface Energy: The Case of CdE (E = S/Se) Nanocrystals

2011 ◽  
Vol 2 (7) ◽  
pp. 706-712 ◽  
Author(s):  
Angshuman Nag ◽  
Abhijit Hazarika ◽  
K. V. Shanavas ◽  
Surinder M. Sharma ◽  
I. Dasgupta ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Surface Energy ◽  
Fine Tuning ◽  
Structure Engineering

scholarly journals Anomalously Strong Second‐Harmonic Generation in GaAs Nanowires via Crystal‐Structure Engineering

2021 ◽  
pp. 2104671
Author(s):  
Bin Zhang ◽  
Jan E. Stehr ◽  
Ping‐Ping Chen ◽  
Xingjun Wang ◽  
Fumitaro Ishikawa ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Gaas Nanowires ◽  
Structure Engineering

Analysis of plasma effect on ultrahigh-molecular weight polyethylene fibers’ surface energy on strength of fibers and fiber reinforced composites

2021 ◽  
Vol 3 ◽  
pp. 42-54
Author(s):  
V. I. Mamonov ◽  
Keyword(s):  
Crystal Structure ◽  
Molecular Weight ◽  
Surface Energy ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Necessary Condition ◽  
Matrix System ◽  
Maximal Load ◽  
Ultrahigh Molecular Weight ◽  
Uhmwpe Fibers ◽  
Fiber Matrix

Completely saturated chemical bonds in ultrahigh-molecular-weight polyethylene (UHMWPE) fibers — are a reason for their low surface energy (FSE), i.e. inert properties. Elongated crystal structure of UHMWPE molecules ensures high anisotropic tensile strength of the fibers. An inertness is a problem for utilization these fibers in high-strength composites production. Surface energy (SE) difference of the fibers and a binder in fiber/matrix system hinders chemical interaction at interphase boundary and worsens fiber wettability. Increase in their FSE is a topical task for this problem decision. Necessary condition of FSE increase is the integrity of molecule structure, lying under modified surface. Low temperature, nonequilibrium plasma (LTP) treatment in a medium of argon and argon/propane mixture, used in this work for plasma activation of fibers’ surface, permits to abide by this condition. However, plasma ion bombardment during a process of activation can modify interior crystal structure and, as a result, decrease their strength. The rovings SK75 (Holland) and D800 (China) were used for study of the properties of UHMWPE fibers after plasma treatment. Activation effect on FSE, strength, and fibers’ wetting by water and epoxy binder before and after ageing was studied. Capillary wetting of the fibers by distilled water used for FSE evaluation. The data of filaments surface structure and their diameter change at maximal load, obtained by optical microscope study, were used for the analysis of FSE and epoxy matrix effect on the strength of fiber/matrix systems. Essential distinction of SK75 and D800 fibers properties is ascertained. Negative effect of fibers’ and matrix’s stiffness, as well as increased FSE of stiff fibers on the strength of fiber/matrix system is revealed.

Crystal structure engineering and optical analysis of novel greenish Sr9Al6O18:Er3+ nanomaterials for NUV excitable cool-white LED applications

2020 ◽  
Vol 759 ◽  
pp. 138044 ◽  
Author(s):  
Priyanka Sehrawat ◽  
Dayawati ◽  
Priti Boora ◽  
Mukesh Kumar ◽  
R.K. Malik ◽  
...  
Keyword(s):  
Crystal Structure ◽  
White Led ◽  
Optical Analysis ◽  
Structure Engineering

Correlation of the Coefficient of Adhesion With Various Physical and Mechanical Properties of Metals

1963 ◽  
Vol 85 (2) ◽  
pp. 279-285 ◽  
Author(s):  
M. E. Sikorski
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Elastic Modulus ◽  
Surface Energy ◽  
Work Hardening ◽  
Physical And Mechanical Properties ◽  
Atomic Volume ◽  
Recrystallization Temperature ◽  
Bonding Method

The coefficients of adhesion determined by a modification of the twist-compression bonding method are compared with the following properties of metals: crystal structure, hardness, surface energy, elastic modulus, work-hardening properties, recrystallization temperature, purity, and atomic volume. Conclusions are reached regarding the desirable characteristics of metals, or combinations of metals, for antifriction applications.

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