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Online since: April 2013
Authors: Tse Pu Chen, Shoou Jinn Chang, Sheng Po Chang
But, there is little report to investigate the 2D structure of ZnO, like nanowalls.
The nanowall structure is advantageous in gas and photonic sensing devices, due to its high surface-to-volume ratio and easy fabrication.
The SEM image of the ZnO nanowalls grown at 550°C only had nanorod-like structure and the nanowalls had almost disappeared.
At 450°C of growth temperature, the ZnO morphology forms nanowalls structure, this showed a good crystal quality in PL spectrum.
Okada: Journal of Physical Chemistry C, Vol. 113 (2009), p. 10975
Online since: March 2006
Authors: An Jie Wang, Dong Pyo Kim, Jia Yan
Preparation of Silver Metallic Sponge from Macroporous Carbon Template Jia Yan 1,a, Anjie Wang 1,b, Dong-Pyo Kim*2,c 1 State Key Laboratory of Fine Chemicals, Dalian University of Technology, 158 Zhongshan Road, Dalian 116012, P.R.China 2 Dept of Fine Chemical Engineering and Chemistry, Chungnam National University, Daejeon, 305-764, Korea a yanjia0625@yahoo.com.cn, banjwang@chem.dlut.edu.cn, *cdpkim@cnu.ac.kr Keywords: Silver Sponge, Macroporous Carbon, template Abstract.
It has been proven by our own previous work that, SiC hollow sphere assembly structures prepared from the identical carbon template were preserved under the same oxidative post-treatment at 500ºC without any sintering behavior [11].
Moreover, in the sample prepared at 550ºC (Fig. 1B), the regular porous structure became less homogenous framework by merging the pores or/and breaking the fused rows or rings.
As the carbon template was removed at higher temperature of 600ºC (Fig. 1C), the silver structure was significantly changed to discontinuous porous network, which was composed of Ag rods with 300~400 nm in skeletal width.
The XRD data show reflections at 2.37, 2.04, 1.44, 1.23 and 1.18 ‡ corresponding to the (111), (200), (220), (311) and (222) d spacings, respectively, of metallic silver with a face-centered-cubic unit cell structure [7].
Online since: May 2012
Authors: Sheng Li Lu, Qing Yun Gao, Yan Yan Tian, Mei Ling Liu
Introduction Environmental monitoring is a process of protecting environment and people health by using chemistry, biology, physics and public health.
Overall Plan of the System The structure of atmospheric environmental monitoring system based on wireless sensor network is shown in Fig. 1.
An embedded gateway and a number of sensor nodes are organized into the wireless sensor network which adopts the structure of star topology.
Fig. 1 Structure of atmospheric environmental monitoring system Environmental Monitoring Variables and Sensors Air quality monitoring was defined as a progress evaluating atmospheric environmental quality, which is based on the observation of the major air pollutants in a certain region [2].
The task of these device drivers is to initialize hardware devices, add and delete device structures, apply for and release the number of device and fill the file_operations structure, and so on.
Online since: March 2011
Authors: Chao Wang, Yu Qiao, Lin Lin Cai, Yu Peng Zhu, Mei Xu
Introduction Polysaccharides especially some molecular weight in thousands of above, biologically active polysaccharide, their physiological activity and structure-activity relationships become research the forefront of polysaccharide.
Results and discussion Rotation analysis.α=0.1096c-0.6738 R2=0.98 C/mg.ml-1 α Fig. 1 The relationship between value and concentration of optical C/mg.ml-1 Fig.2 After ultrasonic 120min on the rotation value of different concentrations KGM Fig 1, KGM water sol have larger rotation value, so may exist KGM molecular left the spiral structure, and this kind of space with the increase of concentration of asymmetric linearly increase.
Mw have no significant differences between 240min and 270min, because ultrasonic time continues to extend and its strength already cannot destroy deeper KGM molecular structure.
Explain when enzyme liquid concentration large, enzyme full role has cut off molecules of KGM, Otherwise enzyme cut it is random. figure 16, enzyme damage molecular and Molecular conformation of KGM, β around in 1.0, this elucidation enzyme causing KGM molecular conformation approximate become rigid molecular structure.
References [1] Pang J, Lin Q, Tian S P: Structural chemistry Vol.22( 2003),p.633-642
Online since: June 2014
Authors: Ji Cheng Xu, Ting Tian, Feng Xian Qiu, Xin Shan Rong
Introduction Cyclodextrins (CDs) are a class of biodegradable cyclic oligosaccharides, consisting of glycopyranose units as a torus-like structure with hydrophilism on the outer surface and relative hydrophobicity in their internal cavity.
The extraordinary structure of CD brings excellent adsorption properties and is able to encapsulate various organic guests within their hydrophobic cavities to afford host-guest complex or supramolecular species [1-3].
From the Fig. 2 (b), the bridged structure is observed.
As shown in Fig. 2 (c), three-dimensional network structures are also observed and the result indicates that host-guest inclusion complex is formed between BDCD and pesticide carbendazim.
Moreover, less sharp peaks in the XRD of inclusion complex (BDCD-carbendazim) may infer that inclusion complex has a more amorphous structure than BDCD.
Online since: May 2006
Authors: Peter Greil, Kristina Lessnau, Marcus W. Rauch, Frank A. Müller, Lenka Müller, Cordt Zollfrank
Introduction Human bone is a complex structured composite material, primarily composed of hydroxylapatite (HAp), an inorganic calcium phosphate, and collagen, an organic protein.
The resulting structure of the tapes is stabilized by intra- and inter-molecular hydrogen bonding.
Subsequent drying leads to a slow evaporation of the remaining water and thus to a collapse of the open structure of the water-swollen tapes.
Decreasing the filler load led to a HAp gradient structure that might be of interest for co-cultured bone-cartilage tissue engineering with adapted biomechanical requirements.
Comprehensive Cellulose Chemistry: Volume 1: Fundamentals and Analytical Methods, Wiley-VCH, (1998) [3] Togawa E, Kondo T.
Online since: January 2018
Authors: Antônio Hortêncio Munhoz Jr., Terezinha Jocelen Masson, Raphael Cons Andrades, Leila Figueiredo de Miranda, Heber Silvestre da Silva, Marcos V. Yamamoto, Mariana Oliva de Oliveira, Renato M. Peres
It is possible to control stoichiometry, porosity, crystalline structure and particle size of the desired products, which influence their morphology and surface area [6].
Pseudoboemita→γAl2O3→δAl2O3→θAl2O3→αAl2O3 (1) The polymorphs of alumina have different structure and properties.
To obtain nitrogen adsorption data for the porous structure of alumina, it was used a Belsorp equipment (model: Belsorp MAX).
The X-ray diffraction data and other analyses together with the literature review confirm that the obtained material has the structure of pseudoboehmite.
Sahu: Materials Chemistry and Physics Vol. 113 (2009), p. 244
Online since: May 2011
Authors: Ying Xue Zhou, Xiao Dong Fan
Littler salt change resulted in larger micelles transition derived from supramolecule structure of SDS and Al3+.
The gel structure of SDS concentrated solutions induced of Al(NO3)3 was studied by rheological method, electron micrograph and differential scanning calorimetry (DSC) and gel microstructure trans- formed from spherical, short rod-like to larger cylindrical micelles was due to formation of supramolecular structure.
Furthermore, were increased with increasing of Al(NO3)3 concentrations, where it can be observed that the micllar structures are clearly more compact[12].
The micellar structures are changed from spherical, short rod-like to larger cylindrical micelles.
Spherical micelles are formed due to structure of SDS in aqueous solution above critical micelle concentration (cmc).
Online since: October 2007
Authors: Pee Yew Lee, Chung Kwei Lin, Chih Chieh Chan, Chen Chin Yi
X-ray absorption near edge structure (XANES) of S K-edges distinguished better the structural evolution of these iron sulfides.
XANES can be used to investigate the electronic structure of specific elements, while EXAFS is used to investigate the local atomic structure of detected atoms.
The results from X-ray absorption spectroscopy (electronic structure and local atomic environment) can be combined with those obtained from conventional X-ray diffraction (long range order) and transmission electron microscopy to understand better the structure of materials.
Photon Energy (KeV) Additionally, the XANES of S K-edge can better examine the structure of this phase.
Solid State Chemistry Vol. 138 (1998), p. 114
Online since: April 2015
Authors: Mun Heng Lam, Mohd Firdaus bin Jaafar, Linasuriani Muhamad, Hanim Salleh
Four different strategies of structural modification are employed for optimization by using additional beam structure as well as incorporation of rubber layer.
In all cases, we can observe that the structure or configuration of the energy harvester is modified in some way.
The modification of the structure using the rubber silicon has shown the best performance when compared to other strategies.
Basrour, Vibration Energy Harvesting with PZT Micro Device, Procedia Chemistry. 1 (1) (2009) 1191-1194
Yang, “Wide-bandwidth piezoelectric energy harvester integrated with parylene-C beam structures”, Microelectronic Engineering (2013)