silica nanofibers and subwavelength diameter fibers

... linkage between silicate or tetrahedral silica units in poly(silicate) is an ester-like bond In order to test whether silicatein – in addition to being a poly(silicate)-forming enzyme (silica polymerase) ... activity of silicatein as a silica esterase, we used recombinant silicatein-a from the demosponge S domuncula [10] Results Presence of silicatein in the spicules and cell organelles, the silicasomes ... its silica polymerase activity, silicatein also comprises a silica esterase function, thus supporting the concept that silicatein is involved in stabilization of the sol state of biogenic silica...

Ngày tải lên: 18/02/2014, 16:20

... absorption bands centered at 3400, 1630 and 950 cm−1 can be assigned to O–H stretching mode for interlayer water, oxonium ions and hydroxyl groups, H–O–H bending for water and oxonium ions, and O–H ... throughly with water and 0.1 mol/L HCl aqueous solution until the pH value of the washing solution lower than 7, and subsequently filtered and dried at 60 ◦ C The structural and chemical natures ... these nanosheets were often bent (Figs and 4) The Na+ ions attached in nanotubes and nanosheets could be exchanged and removed after washing with water and diluted acid solution Titanium in the...

Ngày tải lên: 20/03/2014, 13:11

... 2 .Silica Cr ystalline 2.2 Tổng hợp Hỗn hợp gồm amorphous silica, nước muối amoni điều chỉnh pH 10 pH> 10 Amorphous silica H2O NH4+ Silicate alkonium Tinh thể hóa  (t0) Crystalline silica 2 .Silica Cr ... NỘI DUNG Giới thiệu  1 .Silica Amor phous 2 .Silica Cr ystalline 3 .Silica Fumed 4.Silic Aerogel Giới thiệu • Silica tên gọi chất hóa học silic dioxide SiO2 • Silica tồn nhiều khoáng chất ... sống số dạng silica kích thước nano có tính chất ưu việt đáng quan tâm, nghiên cứu 1 .Silica Amorphous 1.1 Tính chất  Silica amorphous dạng vô định hình  Có đất đá , trầm tích, thể  Silica amorphous...

Ngày tải lên: 03/05/2014, 20:06

... spatial and temporal dependence of the free electron density and the spatial and temporal dependence of laser intensity inside the fused silica At the airsample interface, the transmitted and reflected ... of the photoionization rate WPI in fused silica based on the Keldysh theory The band gap of fused silica is U = 9.0 eV,18 the laser wavelength is 800 nm, and the effective electron mass is 0.86 ... relative dielectric constant of excited fused silica, and n = Reͱ␧ is the corresponding refractive index The first term on the righthand side ͑RHS͒ in Eq ͑2͒ stands for laser diffraction in the transverse...

Ngày tải lên: 06/05/2014, 08:55

... mother liquor and (b) PHPP-SMNPs Fig UV spectra of (a) PHPP, (b) PHPP mixed with SMNPs, (c) PHPP dissolved in HCl and ethanol, (d) SMNPs dissolved in HCl and ethanol, and (e) SMNPs and PHPP dissolved ... (d) indicated absorptions of SMNPs and HCl at 240, 314, and 364 nm, demonstrating that the 240, 314, and 364 nm peak of the spectrum (e) attributed to SMNPs and HCl Therefore, the 409 nm was the ... absorption of PHPP and SMNPs mixture was caused by the Fig 10 UV spectra of the PHPP-SMNPs treated with HCl and ethanol 123 406 Fig 11 The standard curve of PHPP dissolved in HCl and ethanol, measured...

Ngày tải lên: 22/06/2014, 01:20

... compare individual nanofibers, since these fibers cannot be imaged by light microscopy However, bundled fibers were clearly correlated with the polysaccharide stain In addition to nanofibers, nanoparticles ... determined that a complex network of nanofibers of varying lengths and thicknesses were deposited on the coated substrates, as shown in Figure A network of nanofibers was formed from the deposition ... that the nanofibers were composed of individual nanoparticles as shown in Figure Nanoparticles were found in close contact with one another and were associated with the polysaccharide nanofibers...

Ngày tải lên: 11/08/2014, 00:22

... and AB18C6-CD-HPS 95 4.3.4 Comparison of Enantioseparations among the Columns Packed with βCD-bonded Silica Particles, Crown Ether-bonded Silica Particles and Crown Ether-capped β-CD-bonded Silica ... RESULTS AND DISCUSSION Selective modification of the primary and secondary hydroxyl groups of β-CD is complicated and very difficult to control because of statistical and steric problems D′Souza and ... isomers of disubstituted benzenes and stereoisomers of chiral compounds under both normal phase and reversed-phase conditions in HPLC and UHPLC The enantioselectivity and column efficiency for columns...

Ngày tải lên: 17/09/2015, 17:19

... Hct and tube diameter on WSS with special reference to normal and disease level of RBC aggregation and Hct obtained from the study would lead to an advanced understanding of WSS in vivo and possibly ... aggregation and Hct, and a geometric factor, tube diameter (tube size) on WSS The study was performed with special reference to the levels of RBC aggregation and Hct found in normal and diseases ... levels of RBC aggregation and Hct found in normal and disease states in glass microtubes of inner diameter (ID) 30 µm, 50 µm and 100 µm relevant to microcirculation and are described as follow:...

Ngày tải lên: 05/10/2015, 18:59

... = if and only if d = n + and up to a linear coordinate change we have i (x) = xi−1 for all i = 1, , n + 1; (b2) bn (D(Q)) = if and only if d = n + and up to a linear coordinate change and re-ordering ... Hattori’s general position class, and also the (aspherical) fiber-type arrangements of Falk and Randell [FR]; see [JP1] It follows from [JP1, Def 1.8 and Prop 1.10] and [JP2, Cor 3.1] that the (essential) ... will use Q-coefficients ∗ ∗ and the resolution from Proposition 22(ii) Denote by {Bq }q∈Z and {Kq }q∈Z 504 ALEXANDRU DIMCA AND STEFAN PAPADIMA respectively, the q-boundaries and the q-chains of the...

Ngày tải lên: 14/02/2014, 16:20

... 103.35 and 532.65 eV as shown in Results and discussion TEM micrography shows the general morphology and dimension of SiONWs The nanowires shown in Fig 1(a) look like polyp with trunks and branches, ... surface is smooth The trunk has 110 nm in diameter and hundreds micrometers in length by scanning throughout the sample The brunches have the diameter about 60 nm and a length up to lm Electron di€raction ... due to the coexistence of monocentric and polycentric nucleation and of the periodic stable growth on the basis of the trunks and the branches with even diameters When trunks stably grow in monocentric...

Ngày tải lên: 16/03/2014, 15:07

... larger diameters (> rà ) can grow to form nanowires This may be the reason why the diameters of nanowires in zone C are larger than those in zone A or zone B Conclusions In summary, the diameter and ... correlation between morphology and diameter of nanowires Nanowires of larger diameter (100–150 nm) were inclined to be octopus-shaped, while nanowires of smaller diameter (10–15 nm) were inclined ... growth of crystal silicon ceased and silicon oxide of outer layer coalesced together and extended In order to investigate the reason why the SiNWs of such larger diameters were deposited in zone...

Ngày tải lên: 16/03/2014, 15:09

... study are amorphous across the diameter instead of crystalline Si core and amorphous SiO2 outer shell structure as confirmed by HRTEM image and SAED pattern On the other hand, the formation of crystalline ... found to be essential for the SiOx nanowires growth and also different from bi-cycle chain-like morphology of silica nanowires observed by Kar and Chaudhuri [14] during carbon-assisted non-catalytic ... have diameter in the range 30–100 nm with center of the distribution at $50 nm The diameters remain nearly constant throughout the length of the nanowires The nanowires have remarkably clean and...

Ngày tải lên: 16/03/2014, 15:18

... / Physica E 31 (2006) 218–223 219 silica ‘‘nanoflowers’’ [22], radial patterns of carbonated silica fibers [10], silica nanowire ‘‘braids’’ [6], ‘‘bundles’’ and silica ‘‘nanobrushes’’ [23] In the ... from SiONWs with the diameters of $50, $100, and $500 nm, respectively distinct PL bands corresponding to red and green light emissions are observed around 770 nm (1.61 eV) and 550 nm (2.25 eV), ... band) and Egreen (green emission band) can be obtained, although the fitting was quite subjective The results are tabulated in Table The red emission band has a relatively constant intensity, and...

Ngày tải lên: 16/03/2014, 15:19

... Rs(air)/Rs(gas), where Rs(air) and Rs(gas) are the resistance of the sensor in clean air and in detected gas, respectively Results and Discussion 3.1 Morphology, Characterization, and Formation Mechanism ... of S1 and S2 were found to be 5.9 and 15.8 m2/g, respectively, by calculating from the results of N2 adsorption The BET values of S3 and S4 show relatively higher surface areas of 32.5 and 52.3 ... effect in the case of diameters larger than 60 nm (S1 and S2) Second, the experimental results show that the decreasing diameter of nanorods could lead to the split in the ZC and ZFC magnetization...

Ngày tải lên: 20/03/2014, 13:08

... in RADIUS and Diameter May 2009 Introduction This document defines attributes within RADIUS and Diameter that can be used to convey location-related information within authentication and accounting ... Internet-Draft Carrying LOs in RADIUS and Diameter May 2009 Diameter RADIUS Interoperability When used in Diameter, the attributes defined in this specification can be used as Diameter AVPs from the Code ... Asveren and John Loughney helped us with the Diameter RADIUS interoperability section Andreas Pashalidis reviewed a later version document and provided a number of comments Alan DeKok, Lionel Morand,...

Ngày tải lên: 23/03/2014, 03:20

... Prassas and Zarzycki23 prepared lithium aluminosilicates from lithium and aluminum nitrates and ethyl silicate; and some calcium silicates were prepared from calcium nitrate and ethyl silicate ... examples are Brinker and Mukherjef? who used sodium and barium acetates with aluminum, boron and silicon alkoxides; Holand, Plumat and Duvigneaud” used magnesium acetate with aluminum and silicon alkoxides; ... Schuegraf HANDBOOK; James J Licari DEPOSITION Equipment ELEC- Materials, Procand Leonard R PROCESSES AND TECHand Applications: edited by Related Titles ADHESIVES TECHNOLOGY HANDBOOK OF THERMOSET HANDBOOK:...

Ngày tải lên: 30/03/2014, 12:20

... losic Fibers Cellulose Ester Fibers Protein Fibers Polyamide Fibers Polyester Fibers Acrylic Fibers Polyolefin Fibers Vinyl Fibers Elastomeric Fibers Mineral and Metallic Fibers 18 FINISHES AND ... structure and properties This book addresses itself to the structure and properties of textile fibers, dyes, and finishes and the processes used in fiber, yarn, and substrate formation and in dyeing and ... etc.) and not require fiber formation or reformation are classed as natural fibers Natural fibers include the protein fibers such as wool and silk, the cellulose fibers such as cotton and linen, and...

Ngày tải lên: 31/05/2014, 01:29

... micromotion and 15 mm diameter stems at (depth) points of measured cm diaphyseal contact lengththe four data for both 18 mm cm diaphyseal contact length (depth) data for both 18 mm and 15 mm diameter ... micromotion and 15 mm diameter stems at (depth) points of measured cm diaphyseal contact lengththe four data for both 18 mm cm diaphyseal contact length (depth) data for both 18 mm and 15 mm diameter ... experimental protocols and loading conditions and have analyzed a multitude of variables including cemented versus uncemented fixation, proximal and distal fixation, reaming technique and implant design...

Ngày tải lên: 20/06/2014, 00:20

... of FITC and Ru(phen) 32+ co-doped silica particles and TEM images of the Ru(phen)32+-doped particles (A) Procedures for preparation of the FITC (green) and Ru(phen)32+ (red) co-doped silica particles ... Results and discussion Figure 1A illustrates the procedures for preparation of the FITC and Ru(phen) 2+ co-doped silica particles First, the reference dye, Ru(phen)32+, was incorporated into the silica ... and Ru(phen)32+ co-doped silica particles Ammonia (2.4 mL) and water (1.2 mL) were added into the ethanol dispersion of the Ru(phen)3 2+-doped silica particles (60 mL) and then 80 μL APS was added...

Ngày tải lên: 20/06/2014, 22:20