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Online since: June 2014
Authors: Bi Xu, Jing Jing Ge, Zai Sheng Cai
One-step processing to fabricate highly transparent superhydrophobic surface via granuliform silica aerogels Bi Xu1,a *, Jingjing Ge1,b and Zaisheng Cai1,c 1College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, China 201620 axubi@dhu.edu.cn, bsunnyjingge@163.com, czshcai@dhu.edu.cn Keywords: Superhydrophobicity, Transparency, Silica aerogel.
The effect of ageing on the wettability, microstructure morphology and chemical structure of the dried gels has been investigated.
The chemical structure of the aerogels was characterized by an infrared spectrometer (ATR-IR, Nicolet Avatar380).
Meanwhile, the pore structure collapses and small particles firmly connect with each other within the xerogel.
SEM and TEM images indicate that the ageing of the alcogel would provide the aerogel with a very porous 3D network structure while the xerogel without ageing shows large clusters and voids within its structure.
Online since: June 2020
Authors: Raimons Poplausks, Vera Serga, Regina Burve, Aija Krūmiņa
Preparation and Characterization of Nanocrystalline Gadolinium Oxide Powders and Films Regina Burve1,a*, Vera Serga1,b, Aija Krumina1,c, Raimonds Poplausks2,d 1Institute of Inorganic Chemistry, Riga Technical University, P.
Polymorphic transformations of a cubic structure into a monoclinic and of a monoclinic into a hexagonal structure occur at temperatures of 1200 °C and above 2000 °C, respectively [1].
Surface structure of Gd2O3 film.
Surface structure of Gd2O3 film.
Surface structure of Gd2O3 film.
Online since: September 2007
Authors: Jing Chuan Zhu, Jie Cheng, Bo Liu
The cyclic peptides self-assembly design flexibly and synthesis easy and exhibits structural and functional properties suitable for various applications in chemistry, biology and materials science [2-4].
Early in 1974, De Santis predicted the possibility of forming cylindrical structures from D, L-cyclic peptides on the basis of investigation of liner polypeptides [5].
The four dimers represent four types of channel structures.
The optimized dimers structures are shown in Fig. 3.
By comparing the structure of H-bonds, we can conclude that the α-α dimers are more stable than the γ-γ dimers due to the side-chain groups tilting to γ-Acc face.
Online since: October 2009
Authors: Alexander G. Ulyashin, Andrzej Misiuk, Peter Formanek, Adam Barcz
Lotnikow 46, 02-668 Warsaw, Poland 2 SINTEF Materials and Chemistry, P.O.
Structure of the HT-HP processed Si:N and Si:O samples was determined by Transmission Electron Microscopy (TEM).
Typical structures of Si:N processed at 1400 K are presented in Figs 1 and 2.
Typical structures of Si:O processed at 1400 K are shown in Figs 7,8.
This aSi layer contains also nitrogen (the Si:N structures) or oxygen (the Si:O structures).
Online since: September 2020
Authors: Asanah Radhi, Nik Raihan Nik Yusoff, Abdullah Othman, Muhammad Afif Aziz
Fig 1: The molecular structure of CTAB.
This is due to the simple structure of cellulose that only consists of glucose chain with higher number of the hydroxyl groups compared to the structure of sawdust which consits of other complex polysaccharides.
This might due to the highly crystalline structure of the untreated cellulose compared to the amorphous structure of the treated cellulose.
At this magnification, only the surface structures can be clearly seen but not the porosity of the samples.
Moran-Mirabal, “Versatile Surface Modification of Cellulose Fibers and Cellulose Nanocrystals through Modular Triazinyl Chemistry,” Chem.
Online since: July 2012
Authors: Lin Li, Mei Rong Chen, Xing Shen, Song Qing Hu
Tel: +86-020-87113252; Email: fesqhu@scut.edu.cn Keywords: Triticum aestivum, LMW-GS, Cheyenne, PCR, Secondary Structure Abstract.
Prediction of Secondary Structure of Proteins.
The content of each secondary structure including random loop, α-helix and β-sheet in the three subunits were calculated by on-line server The PSIPRED Protein Structure Prediction.
Prediction of secondary structure.
Pomeranz: wheat chemistry and technology, Am Assoc Cereal Chem.
Online since: April 2008
Authors: L. Stoch, I. Wacławska, Magdalena Szumera
Amorphous silicate gel and phosphates as intermediate products of glass structure decomposition are formed.
FTIR (Digilab apparatus) was used to control changes in the glass structure.
Changes on the glass surface caused by the action of this solution during various time periods were traced by means of SEM, and the surface chemistry was determined by the EDS method.
Leachability depends on the strength of oxygen bridges, binding components in the structure of glass [10,11].
Places enriched in SiO2 and aggregates of new formed grains of amorphous silica containing K, Ca, and P are the products of degradation of glass structure.
Online since: June 2007
Authors: S.D. Bu, Y.C. Choi, J. Kim, J.K. Han, K.S. Chang
Han 1 and K-S Chang2 1 Department of Physics, Chonbuk National University, Jeonju 561-756, Korea 2 Department of Chemistry, Korea Air Force Academy, Cheongwon 363-840, Korea *Corresponding author: sbu@chonbuk.ac.kr Keywords: Ferroelectric nanotube arrays, Aluminum oxide template, Anodization Abstract.
The optimal condition for the formation of ordered structure occurs at an appropriate voltage, which can be explained by the volume expansion of the aluminum during anodic oxidation [5].
The inverted images show well a domain structure, where the domains are surrounded with distorted nanopore cells, i.e., defects.
The selected area electron diffraction (SAED) pattern reveals that PT nanotubes are polycrystalline and have a tetragonal structure (P4/mmm, a=3.899 Å and c=4.153 Å) [JCPDS # 06-0452].
SAED pattern reveals that PT nanotubes are polycrystalline and have a tetragonal structure.
Online since: December 2013
Authors: Ya Rui Wu, Qiu Ji Chen, Song Wang
In the reported of home and abroad nowadays, it can be seen that the modification materials of TiO2 mostly using the porous and activity adsorption materials such as zeolite, activated carbon, glass fiber, the synthesized materials that had structure of nanometer channel and so on[1-5].
The resource reserves of serpentine were very rich and had great applied potential and it was suitable for being carrier as its fine fibrous structure .
Table 1 Chemistry results of serpentine SiO2 MgO FeO Cr2O3 ∑ Region Ⅰ 50.05 43.94 4.95 1.06 100 Region Ⅱ 52.99 45.36 1.65 - 100 Region Ⅲ 53.97 46.03 - - 100 1.2 The preparation of TiO2/modified serpentine 1.
Summary (1)The serpentine has fine fibrous structure which make the bigger specific surface area and better adsorption properties.After the serpentine was modified it can be a goog load material
It was found that using modified serpentine as carrier can improve the photocatalytic activity of TiO2 because of its fine fibrous structure which make bigger specific surface area of modified TiO2.Also, TiO2/modified serpentine photocatalyst has a very good recycling performance.
Online since: February 2012
Authors: Fan Yang, Rui Xia Yang, Chen Xin, Peng Gao
Recently, microfluidics have been emerging as a key technology in miniaturization of analytical chemistry.
This paper details the fabrication process using SU-8 photoresist mold which provides high aspect ratio structures and the RIE bonding of PDMS and glass substrate.
The detailed size parameters of the SU-8 structure are also described in the Figure.
Because of the small adhesion between the PDMS and the SU-8, after curing, the PDMS layer with inverse structures having been transferred from the SU-8 mold can be peeled off easily.
A good structure of the microfludic chip was obtained with no leakage phenomenon.