Synthesis and properties of silicon/magnesium silicon nitride diatom frustule replicas

2014 ◽  
Vol 2 (39) ◽  
pp. 16410-16415 ◽  
Author(s):  
Ivar Andre Ødegård ◽  
Julien Romann ◽  
Anita Fossdal ◽  
Arne Røyset ◽  
Gabriella Tranell
Keyword(s):  
Silicon Nitride ◽  
Structural Characterization ◽  
Diatom Frustule ◽  
Metallothermic Reduction ◽  
Novel Method

A novel method for the conversion of diatom bio-silica structures into nano-porous 3D silicon/magnesium silicon nitride replicas utilising simultaneous metallothermic reduction and nitriding is described. Optical, chemical and structural characterization of the replicas is also presented.

Optical and structural characterization of rapid thermal annealed non-stoichiometric silicon nitride film

2008 ◽  
Vol 20 (33) ◽  
pp. 335232 ◽  
Author(s):  
Sarab Preet Singh ◽  
P Srivastava ◽  
G Vijaya Prakash ◽  
M H Modi ◽  
Sanjay Rai ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Structural Characterization ◽  
Nitride Film ◽  
Silicon Nitride Film

scholarly journals Preparation and Characterization of Si3N4-BN Ceramic Composites by Gelcasting

2016 ◽  
Vol 13 (1) ◽  
pp. 28-33 ◽  
Author(s):  
Nagaveni Thallapalli ◽  
K. Kishore Kumar ◽  
C. S. P. Rao
Keyword(s):  
Composite Material ◽  
Silicon Nitride ◽  
Boron Nitride ◽  
Aqueous Media ◽  
Ceramic Composites ◽  
Solution Ph ◽  
Gel Casting ◽  
Novel Method ◽  
Faceted Particles

In this work, a novel method for the preparation of colloids has been studied for the fabrication of silicon nitride –Boron nitride composites. In the present work, the dispersion of mixed silicon nitride –Boron nitride powders in aqueous media was studied with the changes dispersant concentration, solution pH etc. Polyethylenimine (PEI) additive as a dispersant were used for Si3N4 and BN powders in aqueous media. Well-dispersed Si3N4 and BN powders in aqueous media were attained atthe 1 wt% PEI and pH 9. 40 vol% covered Si3N4/BN slurries with varying BN content was adapted for gel casting. The gel casted material waspreheated at normal room temperature, debindered at 6000C and sintered at 17000C. The sintered composite material composed mainly of alpha-Si3N4, beta-Si3N4, and h-BN. The prepared composite material shows uniform microstructure with faceted particles, α-Si3N4 and abundant pores.

Structural characterization of cubic silicon nitride

2000 ◽  
Vol 51 (1) ◽  
pp. 62-67 ◽  
Author(s):  
J. Z Jiang ◽  
K Ståhl ◽  
R. W Berg ◽  
D. J Frost ◽  
T. J Zhou ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Structural Characterization

New ultrastructural findings about Borrelia burgdorferi by cryofixation, negative staining, thin sectioning and scanning techniques

1990 ◽  
Vol 48 (3) ◽  
pp. 582-583
Author(s):  
S. F. Hayes ◽  
M. D. Corwin ◽  
T. G. Schwan ◽  
D. W. Dorward ◽  
W. Burgdorfer
Keyword(s):  
Lyme Disease ◽  
Borrelia Burgdorferi ◽  
Structural Characterization ◽  
Negative Staining ◽  
Low Speed ◽  
Thin Sectioning ◽  
Ultrastructural Findings

Characterization of Borrelia burgdorferi strains by means of negative staining EM has become an integral part of many studies related to the biology of the Lyme disease organism. However, relying solely upon negative staining to compare new isolates with prototype B31 or other borreliae is often unsatisfactory. To obtain more satisfactory results, we have relied upon a correlative approach encompassing a variety EM techniques, i.e., scanning for topographical features and cryotomy, negative staining and thin sectioning to provide a more complete structural characterization of B. burgdorferi.For characterization, isolates of B. burgdorferi were cultured in BSK II media from which they were removed by low speed centrifugation. The sedimented borrelia were carefully resuspended in stabilizing buffer so as to preserve their features for scanning and negative staining. Alternatively, others were prepared for conventional thin sectioning and for cryotomy using modified procedures. For thin sectioning, the fixative described by Ito, et al.

Structural characterization of the PPIase domain of FKBP51, a cochaperone of human Hsp90

2011 ◽  
Vol 44 (06) ◽  
Author(s):  
A Bracher ◽  
C Kozany ◽  
AK Thost ◽  
F Hausch
Keyword(s):  
Structural Characterization ◽  
Ppiase Domain
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