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Online since: July 2011
Authors: Zhuang Liu, Zhi Hui Sun, Jing Lin, Lin Zhu
Conclusions We have proposed magnetron co-sputtering with different RF powers which increased the compactness of SiOx films effectively, formed the hybrid structure between SiOx films and PET substrates and decreased the gas permeability almost ten times compared to single target sputtering.
Harrvey, Activated rate theory treatment of oxygen and water transport through silicon oxide poly(ethylene terephthalate) composite barrier structures, Journal of Physical Chemistry B 101(1997)2259-2266
Structure of sputtered silicon suboxide single and multi layers, Thin Solid Films 420-421(2002) 382-385
Online since: July 2017
Authors: A. Pereira, Márcio Antônio Fiori, Humberto Gracher Riella, A.M. Bugiereck, F. Dalcanton, R. Ternus, J. Dal Magro, J.M.M. Mello, Raquel Piletti
It is properties are due to its essential oils (EOs) and other components of secondary metabolites present in the structure.
According to Wang et al. (2011) in that they are in smaller wave numbers, those relating to complex interactions with water have higher values of energy and are a strong indication that the original structure of β-cyclodextrin molecule was modified by the presence of eugenol, possibly due to its encapsulation [12].
These, have an additional membrane with a structure of phospholipid bilayer, responsible for protecting the inner cytoplasmic membrane, to a greater degree, which promotes greater resistance to this class of bacteria, which explains the occurrence of a smaller halo for E. coli [16].
Higuchi, K.A Connors, Advances in Analytical Chemistry and Instrumentation Vol. 4 (1965), p. 117
Online since: July 2014
Authors: Wen Tao Zhang, Zhong Yi Luan, Zhong Lian Yang, Ming Qiang Chen
Introduction Lignin pyrolysis has been focused widely because this progress can unravel the structure of the aromatic biopolymer and produce monomeric phenols [1].
Therefore, since the last decade or so, there are many new treating methods such as solving in alkaline [4], hot water and/or organic solvent as phenols, which have been devoted to depolymerize the complex structure of lignin.
Fig. 2 The determinate plot of pyrolysis kinetic break points using Coats and Redfern (C-R) method Compared with the activation energy E and frequency factor A respectively, the former section is the pyrolysis dominating moment in the kinetic control range, and the activation energy of treated sample is about 2.2 times greater than the original one, which indicated that a more stable chemical structure has been generated from the ALG sample by the treatment of the mixture solution of hydrogen peroxide and [BMIm]Cl, but the new modified ALG can be pyrolysis easier than before as a result of extremely huge frequency factor.
Kirchner (Ed.), Ionic liquids, volume 290 of Topics in Current Chemistry, Springer Berlin Heidelberg, (2010), pp. 311–339
Online since: September 2013
Authors: Tijjani Adam, U. Hashim, M. Wesam Al-Mufti
Design and Fabrication of PDMS Microchamber for Fast Reaction Assays in Biosensing Application Tijjani Adam1,a and U.Hashim1,b, M.Wesam Al-Mufti1,c 1Nano structure Lab on chip research group, Institute Nano Electronic Engineering, Universiti Malaysia Perlis.
DNA or protein must be attached to certain locations within the structure.
Critical for this is to have a robust binding chemistry to the surface in the microstructure.
Appreciation also goes to all the team members in the Institute of Nanoelectronic Engineering especially the Nano structure Lab On chip Research Group.
Online since: August 2016
Authors: Pavel Mec, Jana Boháčová, Petr Závrský
According to the structure, the material is at the interface of glass and ceramic materials and also conventional hydrated inorganic binder.
Structure of alkali activated materials has not been fully elucidated.
Alkali Activated Materials could be used as repair materials, repair mortar, leveling compounds, socle plaster as well as for grouting stone cladding and also in construction, where is the higher strength of the substrate (concrete structures).
Davidovits, Geopolymer, chemistry and application.
Online since: February 2012
Authors: Lin Dai, Jing He, Shu Xiao
Introduction In response to the shortage of petroleum resources and the strategy of sustainable development, green chemistry and its industrial revolution are rising rapidly.
FTIR spectroscopy (Magna-IR 750, Nicolet, USA) was used to characterize the structure of AmimCl and cellulose-g-poly (L-lactide), respectively, using a KBr tablet Method.
In this case, the ionic liquid changed the microscopic structure of cellulose during its dissolution process, and the cellulose changed from cellulose I to II.
Structure characterizations of cellulose-g-PLLA.
Online since: May 2011
Authors: Chao Hui Zhang, Si Si Liu, Jun Ming Liu, Yue Tao Sun
Water soluble polyether is usually used as nonionic surfactant due to the fact that epoxy ethenyl (epoxy ethyl) result in a unsymmetrical molecular structure – with a non-polar hydrophobic end and the other a polar hydrophilic end.
And the molecular structures of the four PEOEs are listed in Tab. 2.
Tab. 1 Characteristics of four kinds of PEOEs Cloud point / ℃ (1% water solution) pH value (1% water solution) HLB value KE-1 75-85 7-9.9 14-15 L-64 57-61 5.0-7.0 13 TX-15 90-95 5.0-7.0 14.5-15 EL-40 70-84 5.0-7.0 13-14 Tab. 2 Molecular structure of four kinds of polyethoxylated ether KE-1 L-64 TX-15 EL-40 De-ionized (DI) water was used to prepare all aqueous solutions.
Wen: Physics and Chemistry of Micro-Nanotribology (ASTM Int.
Online since: March 2011
Authors: Jun Gang Gao, Xiao Na Zhang, Yong Gang Du
Synthesis of Three Novel Aromatic Biazomethine Liquid- Crystalline Epoxy Resins and Curing Reaction with Aromatic Diamine Jungang Gao1,a, Xiaona Zhang1,2,b, Yonggang Du1, c 1College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China 2Hebei Chenyang Industrial CO., Hebei Xushui, 07100, China agaojg@hbu.edu.cn ; bzhangxiaonaz@163.com; cdyg2166@sina.com Keywords: liquid crystal; epoxy resins; aromatic diamine; curing reaction Abstract: Three class of novel liquid crystalline epoxy resins containing azomething groups: N,N’-Bis[4-(2,3-epoxypropoxy)benzylidene]-4,4-diamino-diphenyl ether (p-BEPBDDE), N,N’-Bis[4-(2,3-epoxypropoxy)benzylidene]-4,4-diamino-diphenyl methane (p-BEPBDDM) and N,N’-Bis[(4-(2,3-epoxypropoxy)-benzyliden)-1,4- phenylene diamine] (p-BEPBPD) were synthesized and characterized.
In this works, three kinds of aromatic biazomethine liquid-crystalline diglycidyl ethers from 4,4-diaminodiphenyl ether (DDE), 4,4-diaminodiphenyl methane (DDM) and p-Phenylene diamine were synthesized and molecular structures and physical properties were characterized by 1HNMR, FTIR, DSC, POM and XRD.
Characterization: Fourier transform infrared spectrophotography (FTIR FTS-40, Bio-Rad, USA) was used to determine the structure of the liquid crystalline compounds (KBr plate method).
Schem.1.The synthesis routes and molecular structure of A2, B2 and C2 Synthesis of N,N’-Bis[4-(2,3-epoxypropoxy)benzylidene]-4,4-diamino-diphenyl ether (p-BEBDDE, A2): A mixture of 4,4-diaminodiphenyl ether and 4-Hydroxybenzaldehyde in a molar ratio of 1:2 was dissolved in N,N’-dimethylformamide and heated at reflux temperature for 24h.
Online since: September 2018
Authors: Torranin Chairuangsri, Amporn Wiengmoon, John T.H. Pearce, Suttawan Imurai, Napachat Tareelap
Pearce5,e 1Department of Physics, Faculty of Science, Naresuan University, Phitsanulok, 65000, Thailand 2School of Energy, Environment and Materials, King Mongkut’s University of Technology Thonburi, Bangkok, 10140, Thailand 3Faculty of Gemological Science and Applied Art, Rambhai Barni Rajabhat University, Chanthaburi, 22000, Thailand 4Department of Industrial Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand 5Panyapiwat Institute of Management, Nonthaburi, 11120, Thailand a*ampornw@nu.ac.th, bnapachat.tar@gmail.com, csuttawani@gmail.com dtchairuangsri@gmail.com, ejthp70@gmail.com Keywords: High chromium cast iron, molybdenum, heat treatment, corrosion.
After destabilisation and air hardening, the structures contained secondary carbides within martensitic matrices (Fig. 2).
g M7C3 M6C g M7C3 M6C g M7C3 Fe Cr c d b 10mm 10mm 10mm 10mm 10mm 10mm a Figure 1 (a-c) SEM-BEIs show the as-cast microstructure in the reference iron (R), Mo1 and Mo6 irons, respectively (d) EDS spectrum from the Mo-rich lamellar structure in Mo6 iron.
a M7C3 SC within a¢ 5mm 5mm SC SC M7C3 M7C3 c 20mm M7C3 M6C SC within a¢ 20mm b d Figure 2 SEM-BEIs show the secondary carbide (SC) precipitates within martensite (a¢) matrix after destabilisation (a-b) the reference iron (R) and (c-d) Mo6 iron (Denoted, b and d were deep etched structure after removal the martensite matrix).
Online since: September 2013
Authors: Hui Li, Xiao Ting Li, Shou Zhi Pu
Photochemistry Properties of a Novel Photochromic Diarylethene Derivative Xiaoting Li, Hui Li, Shouzhi Pu* Jiangxi Key Laboratory of Organic Chemistry,Jiangxi Science and Technology Normal University Nanchang 330013, P.R.
Introduction Photochromism is a reversible transformation induced by photoirradiation between two forms with different chemical structures [1, 2].
The different chemical structures may cause changes of various physicochemical properties, such as absorption, emission and redox potential.
The structure of diarylethene 1o was confirmed by NMR; 1H NMR (400 MHz, CDCl3, TMS): δ 1.98 (s, 3H, –CH3), 2.31 (s, 3H, –CH3), 2.68 (s, 3H, –CH3), 7.11–7.13 (d, 1H, J = 8.0 Hz, benzene–H), 7.22 (s, 1H, thiophene–H),7.27–7.29 (d, 1H, J = 8.0 Hz, benzene–H), 7.33–7.35 (d, 2H, J = 8.0 Hz, benzene–H).