Supramolecular Structure Characterization of Molecularly Thin Cellulose I Nanoparticles

2011 ◽  
Vol 12 (3) ◽  
pp. 650-659 ◽  
Author(s):  
Qingqing Li ◽  
Scott Renneckar
Keyword(s):  
Supramolecular Structure ◽  
Structure Characterization ◽  
Cellulose I

Supramolecular Structure Characterization of Cellulose II Nanowhiskers Produced by Acid Hydrolysis of Cellulose I Substrates

2012 ◽  
Vol 13 (2) ◽  
pp. 570-578 ◽  
Author(s):  
Gilles Sèbe ◽  
Frédérique Ham-Pichavant ◽  
Emmanuel Ibarboure ◽  
Akissi Lydie Chantal Koffi ◽  
Philippe Tingaut
Keyword(s):  
Acid Hydrolysis ◽  
Supramolecular Structure ◽  
Structure Characterization ◽  
Cellulose Ii ◽  
Cellulose I ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

Morphology and supramolecular structure characterization of cellulose isolated from heat-treated moso bamboo

Cellulose ◽  
2019 ◽  
Vol 26 (12) ◽  
pp. 7067-7078 ◽  
Author(s):  
Yuxiang Huang ◽  
Fandan Meng ◽  
Ru Liu ◽  
Yanglun Yu ◽  
Wenji Yu
Keyword(s):  
Supramolecular Structure ◽  
Moso Bamboo ◽  
Structure Characterization ◽  
Heat Treated

scholarly journals Nitrate-Bridged One-Dimension Coordination Polymer Self-Assembled from a N4O2-Tetraiminodiphenolate Dicopper(II) Macrocyclic Complex

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Julio Cesar da Rocha ◽  
Priscilla J. Zambiazi ◽  
Manfredo Hörner ◽  
Fábio Souza Nunes
Keyword(s):  
Hydrogen Bonding ◽  
Coordination Polymer ◽  
Supramolecular Structure ◽  
Macrocyclic Ligand ◽  
Macrocyclic Complex ◽  
Structure Characterization ◽  
One Dimension ◽  
Coordination Geometry ◽  
X Ray

Herein we report on the synthesis and single crystal X-ray structure characterization of [{Cu2(tidf)(μ-NO3)}∞]ClO4(tidf = a Robson type macrocyclic ligand obtained upon condensation of 2,6-diformyl-4-methylphenol and 1,3-diaminopropane). The coordination geometry around the copper(II) is square-pyramidal and has [Cu2(tidf)]2+units connected to each other through nitrate bridges extending as a one-dimension coordination polymer. The compound exhibits an extensive supramolecular structure supported by nonclassic hydrogen bonding between C-H⋯Operchlorateand C-H⋯Onitrate.

Characterization of microwave-sintered ceramic composites

1993 ◽  
Vol 51 ◽  
pp. 1136-1137
Author(s):  
X. Zhang ◽  
Y. Pan ◽  
T.T. Meek
Keyword(s):  
Matrix Material ◽  
Maximum Output Power ◽  
Ceramic Matrix Composite ◽  
Ceramic Composites ◽  
Processing Technique ◽  
Structure Characterization ◽  
Alumina Powder ◽  
Maximum Output ◽  
Sintered Ceramic

Industrial microwave heating technology has emerged as a new ceramic processing technique. The unique advantages of fast sintering, high density, and improved materials properties makes it superior in certain respects to other processing methods. This work presents the structure characterization of a microwave sintered ceramic matrix composite.Commercial α-alumina powder A-16 (Alcoa) is chosen as the matrix material, β-silicon carbide whiskers (Third Millennium Technologies, Inc.) are used as the reinforcing element. The green samples consisted of 90 vol% Al2O3 powder and 10 vol% ultrasonically-dispersed SiC whiskers. The powder mixture is blended together, and then uniaxially pressed into a cylindrical pellet under a pressure of 230 MPa, which yields a 52% green density. The sintering experiments are carried out using an industry microwave system (Gober, Model S6F) which generates microwave radiation at 2.45 GHz with a maximum output power of 6 kW. The composites are sintered at two different temperatures (1550°C and 1650°C) with various isothermal processing time intervals ranging from 10 to 20 min.

scholarly journals Common Phase and Structure Misidentifications in High-Resolution TEM Characterization of Perovskite Materials

2020 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Yu-Hao Deng
Keyword(s):  
High Resolution ◽  
Research Field ◽  
Structure Characterization ◽  
Phase Identification ◽  
Lead Iodide ◽  
Perovskite Materials ◽  
High Resolution Tem ◽  
Methylammonium Lead Iodide ◽  
Dose Imaging

High-resolution TEM (HRTEM) is a powerful tool for structure characterization. However, methylammonium lead iodide (MAPbI3) perovskite is highly sensitive to electron beams and easily decomposes into lead iodide (PbI2). Misidentifications, such as PbI2 being incorrectly labeled as perovskite, are widely present in HRTEM characterization and would negatively affect the development of perovskite research field. Here misidentifications in MAPbI3 perovskite are summarized, classified, and corrected based on low-dose imaging and electron diffraction (ED) simulations. Corresponding crystallographic parameters of intrinsic tetragonal MAPbI3 and the confusable hexagonal PbI2 are presented unambiguously. Finally, the method of proper phase identification and some strategies to control the radiation damage in HRTEM are provided. This warning paves the way to avoid future misinterpretations in HRTEM characterization of perovskite and other electron beam-sensitive materials.

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