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Online since: June 2010
Authors: Algirdas Vaclovas Valiulis, Jelena Škamat
Lithuanian research is strong in biotechnology, biochemistry, chemistry, mathematics, physics (especially laser physics), ICT, electronics and power-engineering.
The investigations of element and phase structure and properties of the yttrium stabilized zirconium coatings obtained by plasma spraying method are provided (Fig. 3).
Fig.3 Porous carbon (a) and catalytic (b) plasma coatings Research is carried out analyzing principles of structure formation of cementitious composite materials with nanomodifiers and impact of these composites on product properties.
Current research activities: photonic band gap structures and microdevices in semiconductor, polymeric and other materials: formation and characterization; development of the nanoimprint lithography for system polymersemiconductor; synthesis of diamond-like carbon films; GaAs surface and contact treatment and passivation by chemical and physical methods (Fig. 5); systems of nanostructured self-assembled thin films, plasmonic structures.
The level of business investment in R&D is primarily determined by the business structure of the country, in which the most research-intensive business sectors of high and medium-high technologies occupy a relatively modest share.
Online since: June 2014
Authors: Guo Xin Tan, Ying Tan, Cheng Yun Ning, Lin Zhang, Lei Zhou, Hang Wang
After photo-crosslinking, GelMA hydrogel coatings on titanium surface showed interconnected macroporous structure with the pore size ranging from 20-200μm.
Meanwhile, the mesh size of hydrogel was large enough to allow diffusion of BSA into the internal structure.
As shown in Fig.3d, fluorescence could be observed in the inner region of the GelMA hydrogel, implying that the labeled protein could diffuse into and form bind with the network structure.
The amount of protein adhered on the nanoporous structure (Fig. 3b and 3c) was higher than that on nanosteps-like structure of control Ti (Fig. 3a), suggesting that increased surface roughness provides more surface area for protein adsorption.
Taken together, each of surface properties such as chemistry, charge, morphology and wettability can affect protein adsorption differently.
Online since: June 2008
Authors: Xiang Wei Zhao, Hua Xu, Zhong Ze Gu
Introduction Recently photonic crystals (PC) or photonic band gap (PBG) materials, which have periodically modulated dielectric constants, are attracting more and more attention of researchers who are not only in the field of photonics but also in the fields of chemistry, physics, microelectronics and biology [1~3].
However, it has so far proved difficult and cost-ineffective to achieve submicron periodic structures in three dimensions [5, 6].
Moreover, the optical properties of the so called photonic crystal structures can easily be tuned only by changing the sizes of the individual colloids, or they can be used as templates to make inverted structures.
And the beads can also be used as templates to make inverted bead structures.
When binding events occurs on the surfaces of the interconnected pores in the structure, its PBG will shift due to the resulted refractive index change until the binding events on the surface is saturated.
Online since: June 2007
Authors: Moo Eon Park, Jeong Ho Chang, Young Kook Shin
The Preparation of Bone-Mimetic Sol-Gel Nanoporous Scaffold of L3phase Silica/Hydroxyapatite Jeong Ho Chang 1,a , Moo Eon Park 1, Young Kook Shin2,b 1 Korea Institute of Ceramic Engineering and Tecnology, Seoul, 153-801, Korea 2 Department of Chemistry, Chungbuk National University, Chungbuk, 361-763, Korea a Corresponding author: jhchang@kicet.re.kr b Corresponding author: synyk@chungbuk.ac.kr Keywords: Silicified L3-phase, Hydroxyapatite, Controlled release, Porosity Abstract.
This work presented the highly controlled drug delivery system to achieve the suppression of the burst release at initial time and long term release of drug with cancellous bone mimetic nanoporous structures.
Results and Discussion Based on our previous work, the silicified L3-phase gel represented the spatial continuity and high uniform of the pore structure with 5 nm of pore-size, and still multiply connected porous structure even though the pores of the L3-PNIPAm gels was covered by the PNIPAm polymer [5].
Moreover, the L3-PNIPAm gel on HA showed the distorted layer structures with 3 nm pore-size by TEM, in which the pore size was reduced by polymer-wrapping from 5 nm of silicified L3 gel (Fig. 1(c)).
Despite the PNIPAm gel showed a drastical deswelling at 35-40°C as a lower critical solution temperature (LCST), the L3-PNIPAm gels showed a slight deswelling with increased temperatures due to the existence L3 ceramic structures.
Online since: July 2012
Authors: Wen Zhi Zheng, Zhen Yue Chi, He Chao Pan, Hai Jian Chen
Pore structure is also at nanoscale and exists among the particles [2].
Their structures and performances were characterized and contrasted to provide the basic information for the application study of SiO2 aerogels.
After metal spraying treatment on the surface, the pore structure and particle size distribution on the surface of the sample were observed at a certain magnification.
This umbrella shaped hydrophobic structure shape connected to the SiO2 would connect to each other and form a hydrophobic membrane.
Materials Chemistry and Physics.Forum Vol. 113 (2009), p. 485-490
Online since: June 2014
Authors: Quan Sheng Liu, Ke Duan Zhi, Yan Peng Ban, Yan Hua Tang, Jie Wang, Ya Jie Wu, Yuan Fan, Yang Li
During the pyrolysis progress, bridged bond fission of inner activity structure and the interreaction between side chain and low molecular compound would produce volatile gas, and at the same time, carbon content would increase, hydrogen content would decline, side chain of coal molecular would break, free radical would reduce, pore structure would enrich and more active group would expose; so, the reaction rate with oxygen would accelerate in unit time along with the increase of oxygen consumption and CO2 production.
In less than 200 ℃ pyrolysis, The structure of the coal similar to the raw coal basically stable.
With increasing degree of pyrolysis, the side chain of coal molecular rupture ,free radical decrease and abundant pore structure .There is no generate CO when proceed physical adsorption .However, the CO, C2H4, H2O and CO2 gas were generated in the chemical reaction
Acknowledgements This work was financially supported by National Natural Science Foundation of China (21266012), Program of Natural Science Foundation of Inner Mongolia(2012MS0203), Universities Scientific Research Project of Inner Mongolia Department of Education (NJZY12067), Major Program of IMUT(ZD201108) and Program Foundation for Coal Chemistry Preponderant Discipline of IMUT.
The science of Victorian brownal: structure properties and consequences for utilization[M].
Online since: October 2012
Authors: Ye Fei Jin, Wei Lin Shi, Yao Ge
The mosaic blocks are the smallest unit cell of structure, almost as thick as a small block.
These show that the growth style is characteristic of epitaxy growth of layer- structured.
Moreover, unlike the pearls from the control group, the pearls from the low Ce group possess an unambiguously layered structure.
[6] Shi Ling-yun, Guo Shou-guo, Study on the composition and structure of pearls[J].
Charateristics of Ecological Chemistry of Rare Earth Elements in Fish from Xiamen Bay.
Online since: January 2014
Authors: M.Z.A. Malik, M.T. Zainuddin, S.A.A.A. Nazri, N.M.A.N.A. Aziz, K.M. Isha, N.Z.M. Islam
It is important to all applications of photochromic to observe the stable moleculers structure of photochromism behaviour.
The intermediate structure molecules are known as isomer ‘X’ [11, 12].
Isomer ‘X’ are potential to convert into the most stable structure which are formed into 4 possibilities of cisoid stereoisomers structures and 4 transoid stereoisomers structures same as found by Guglielmetti as cited in [13].
The increasing number of transformation structure to open merocyanine can be predicted from the observation of higher absorption bands intensity.
Bertelson, In Techniques of Chemistry, vol.
Online since: January 2013
Authors: Xiao Ya Hu, Tian Tian, Lu Wang, Yang Wang
Simultaneous Determination of Lomefloxacin and Ciprofloxacin in Dairy Products by First-Derivative Synchronous Spectrofluorimetry Yang Wang*, Tian Tian, Lu Wang, and Xiaoya Hu College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, PR China *wangyangyz@yahoo.cn Keywords: First-derivative excitation spectrofluorimetry; Zero-crossing technique; Lomefloxacin; Ciprofloxacin Abstract.
Due to their similar molecule structures, it was difficult to analysis and determine LFLX and CPLX simultaneously by conventional fluorometry.
There is a carbanyl group, a carboxyl group and an amino group in the molecular structure of LFLX and CPLX.
Online since: February 2013
Authors: Dan Zhang, He Zhang, Cheng Xun Sun, Bao Yu Zhu
The size, crystal structure, composition and the optical property of product were further studied in detail by TEM, PL, UV, XRD and EDS.
In this work, we prepared a kind of lanthanide ions doped CdSe Nanocrystals by non-injection one-pot synthesized method, and the size, crystal structure, composition and the optical property were further studied in detail.
Matthews, Comprehensive Coordination Chemistry II, Vol. 9, Elsevier, Oxford, UK, 913-944(2004) [26] A.Beeby, S.W.