surface modification of carbon nanotubes cnts for composites

... ENGINEERING AND SURFACE MODIFICATION OF BACULOVIRUS DERIVED VECTORS FOR IMPROVED GENE DELIVERY TO THE CENTRAL NERVOUS SYSTEM YANG YI (B Eng.) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY ... Characterization of Baculovirus Particles…………141 5.1.2 Genetic Engineering of Baculovirus Vectors for Controlled Gene Expression……………………………………………………… 142 5.1.3 Surface Modifications of Baculovirus Vectors for ... to become protonated The branched form of PEI has yielded significantly greater success in terms of cell transfection, and is therefore the standard form of PEI for gene delivery Highly branched...

Ngày tải lên: 14/09/2015, 11:28

... energy of singlewalled carbon nanotubes Appl Phys Lett 1999, 16:2307-2309 Peigney A, Laurent C, Flahaut E, Bacsa RR, Rousset A: Specific surface area of carbon nanotubes and bundles of carbon nanotubes ... functionalization of single-wall carbon nanotubes through C-N bond forming substitutions of fluoronanotubes-Patent 2006, US2006171874 Ford WE, Wessels J, Yasuda A: Method and apparatus for producing carbon nanotubes- Patent ... properties of CNTs Carbon nanotubes are a huge cylindrical large molecules consisting of a hexagonal arrangement of sp2 hybridized carbon atoms (C-C distance is about 1.4 Ǻ) The wall of CNTs is...

Ngày tải lên: 20/06/2014, 22:20

... Fig Dependence of carbon yield on the reaction temperature be through the precipitation of carbon in the form of MWNTs from the molten catalytic particles The melting temperatures of the alloy-C ... could act as nucleation sites for the growth of carbon nanotubes There could be a further reduction in the catalyst particle size during the hydrogen treatment before the carbon deposition Further, ... of D-band for Nifilled MWNTs is due to the non-uniform filling of Ni, resulting in increased degree of disorderness Alloy nanowire filled MWNTs could be used in the development and fabrication of...

Ngày tải lên: 22/06/2014, 22:20

... loss of magnetism and dispersibility Therefore, the surface modification of nanoparticles is indispensable and the particle surface can be modified by grafting inorganic or organic coating Surface ... of MNPs endows the particles with important properties Modification of the surface of MNPs prevents agglomeration of the particles and thus stabilizes the colloidal system Functionalization of ... the modification of the surfaces of such magnetic particles with polymeric substance to receive organic-inorganic nanocomposites These nanocomposites has made accessible in immense area of new...

Ngày tải lên: 08/09/2015, 19:41

... measured for a bulk sample.24 The mechanism of size-dependent UC properties may be attributed to the surface ligands quenching, surface defects and surface segregation.25 Therefore, surface modification ... of 4f-4f transition of surface Ln3+ ions Undesirable distribution of the dopant ions can also be resulted due to a higher ratio of surface- to-interior atoms, like surface segregation.31 All of ... UC/shell/Au-silica nanocomposites with the interval time of 14 h Diffraction patterns (inset of a) of UC/shell/Au-silica nanocomposites 83 Figure 5.2 XPS spectrum of Au 4d level for UC/shell/Au-silica...

Ngày tải lên: 09/09/2015, 10:20

... electrospinning 14 2.3.3 Modifications of the electrospun nanofibers 19 2.3.4 Potential application of Mesenchymal stem cells for osseointegration 20 Chapter 3: Biomimetic surface modification of dental implant ... thank my parents for their profound love and support TABLE OF CONTENTS ACKNOWLEDGEMENTS TABLE OF CONTENTS LIST OF FIGURES LIST OF TABLES LIST OF APPENDICES LIST OF ABBREVIATIONS Chapter 1: Introduction ... roughness of the implant surface owing to the various surface modification techniques were shown in Table 2.1 Table 2.1 Different types of implant surface modifications and their surface roughness and...

Ngày tải lên: 02/10/2015, 12:55

... regions of the CD molecules 24 Figure 2-6 The formation of CD inclusion complex 25 Figure 2-7 Molecular structures of RhB, (a) Monomeric form/Cationic form and (b) Dimer form/Zwitterionic form 29 ... temperature [39] 2.2.4 Surface modification of magnetic particles In the absence of any surface modification, magnetic nano-sized particles exhibit hydrophobic surfaces with a large surface area to ... Figure 2-1 Schematic diagram for separation of non-magnetic materials 2.1.2 Driving force for dye adsorption on solid surface The uptake of dye onto the adsorbent surface depends on several factors...

Ngày tải lên: 12/10/2015, 17:36

... presents the results of nanofibrous surface modification of PCL membrane in terms of surface characterization and cell behavior studies The results showed that uniform nanofibrous topology were ... knowledge of biomaterials, the author would like to present recent data published for the surface modification of PCL, only to clarify the traditional ways to modify the inert surface of PCL It ... first summarized success of nanofibrous surface modification on ultra-thin PCL membrane With the consequent serial of changes due to the modification, a better ECM-mimic surface was achieved, so...

Ngày tải lên: 26/11/2015, 22:40

... dependence of@ e structure of EELS on the diameter and the anisotropic features of CNTs Introduction - Morphological Features of CNTs Since the discovery of carbon nanotubes (CNTs) [I], most of the ... monograph is entitled "The Science and Technology of Carbon Nanotubes" as the successive version of ref for the benefit of actual and potential researchers of these materials by collecting and arranging ... all of the authors should like to offer the readers the newest developments of the science and technological aspects of CNTs vi It is our biggest sorrow that in the course of preparation of this...

Ngày tải lên: 05/03/2014, 17:20

... mixture of graphitic carbon and SiC nanowires was formed because of both the carbonization of the nanowires and the fast carbon deposition to form the carbon- like structure Conclusions In summary, CNTs ... characteristics of carbon deposition on the crystalline Si NW can be envisaged to be controlled by both a template e€ect for the formation of tube-like carbon shell structure and a carbonization e€ect for ... $900°C, carbon multilayers were formed on the surface of carbonized Si NWs At a higher reaction temperature ($1000°C), the silicon cores reacted with carbon and transformed into b-SiC cores Carbon...

Ngày tải lên: 16/03/2014, 15:04

... chemical properties of CNTs, highly efficient purification of the as-prepared CNTs is, therefore, very important 1.3 Assessment of CNT purity To evaluate the purity of CNTs, the efficiency of a purification ... Precise content of carbon and metals Diameter, quality and conductivity of SWCNTs Conductivity feature and content of SWCNTs Accurate assessment of F-G on CNTs Elemental contents, special for trace ... relatively low and of short range Therefore, the polymer chain length and surface coverage for the dispersion of CNPs was lower than that needed for the dispersion of MWCNTs On the basis of this theoretical...

Ngày tải lên: 20/03/2014, 13:06

... nano 2.4 Tổng hợp chức hóa Carbon nanotubes (CNTs) Với trang thiết bị có phòng thí nghiệm lọc hóa dầu – Đại học Bách khoa Đà Nẵng , tổng hợp thành công Carbon nanotubes (CNTs) theo phương pháp kết ... hóa CNTs mô tả hình Quá trình chức hóa CNTs thực vòng 24 CNTs sau chức hóa, ký hiệu CNTs- unct, thu hồi lọc hút chân không rửa nhiều lần nước cất đạt pH trung tính Kết thúc trình này, thu CNTs ... Vật liệu tổ hợp g-nano /CNTs- funct/cotton Kết chụp TEM vật liệu CNTs tổng hợp được trình bày hình cho thấy kích thước ống carbon (CNTs) nằm khoảng 10 – 30nm Hình 5: Ảnh TEM CNTs Trong trình thí...

Ngày tải lên: 22/03/2014, 17:20

... Properties of Carbon Nanotubes 319 Fig 17 Molecular mechanics calculations on the axial and radial deformation of single-wall carbon nanotubes (a) Axial deformation resulting from the crossing of two ... TPa nm/d for SWNT’s of diameter d 3.2 Evidence of Nonlinear Mechanics and Resilience of Nanotubes Large amplitude deformations, beyond the Hookean behavior, reveal nonlinear properties of nanotubes, ... is responsible for the apparent softening of MWNT of larger diameters A variety of largely and reversibly distorted (estimated up to 15% of local strain) configurations of the nanotubes has been...

Ngày tải lên: 24/03/2014, 05:20

... spectra of CNTs grown under negative and zero dc bias voltage represent sp3 rich phases of CNTs and suggest the existence of amorphous carbon or defects on the walls of CNTs. 31 The absence of a ... resistances of the CNTs tend to show a somewhat inverse correlation with the quality of the CNTs The absence of a distinct D′ mode at 1625 cm-1 and a peak at 1180 cm-1 for the Raman spectra of CNTs ... to be the relative amount of amorphous carbon and the density of defects on the walls of the CNTs However, as subsequently shown, the high electrical resistance of CNTs grown under negative dc...

Ngày tải lên: 06/05/2014, 08:53

... (MOSFETs) The key role of Schottky barriers and the critical effects of the environment on the performance of SWNT-FETs are stressed Then the nature of the excited states of nanotubes and their optoelectronic ... single-walled variant of carbon nanotubes Since then, we have observed the progress of science and technology as it relates to carbon nanotubes changing from the discovery of various methods to ... concepts to the studies of the unique physical and mechanical properties of carbon nanotubes Some of the chapters in these books deal with what might be unique about carbon nanotubes and where one...

Ngày tải lên: 04/06/2014, 14:50

... single wall carbon nanotubes Carbon 2002, 40:2043-2061 24 Deng F, Zheng QS, Wang LF: Effects of anisotropy, aspect ratio, and nonstraightness of carbon nanotubes on thermal conductivity of carbon ... properties of the system Thus, we aimed at studying the effect of two types of carbon- based nanofillers, in particular, nanotubes and graphene sheets, on the thermal conductivity of an uncured ... interest and effort in the transport properties of carbon nanotube [CNT] filled polymer nanocomposites [2, 3] Electrical conductivity of epoxy nanocomposites increases by several orders of magnitude...

Ngày tải lên: 20/06/2014, 23:20

... (l = 365 nm) for h, the replica mold was peeled off, providing a surface nanopillar-patterned NOA63 polymer layer formed on a PET film (Figure Page of 1b) For the generation of surface hydroxyl ... 2b) FE-SEM images of the surface of the sample treated for 15 showed that the pillar agglomeration and surface deformation continually progressed (Figure 3c), and after 30 of treatment (Figure ... FE-SEM images of the surface of samples treated with photooxidation for different periods of time Short exposure to UV radiation, e.g., (Figure 2a), did not significantly alter the surface, except...

Ngày tải lên: 20/06/2014, 23:20

... at the surface, enabling the construction of CNTs However, the formation of the initial caps at the nucleation stage has yet to be clarified [19] Some argue a transformation process of surface ... [20,21] or amorphous carbon [22] forms nucleation caps Others argue the formation of convex structures on the surface enable initial cap formation [23-25] Single-walled carbon nanotubes (SWNTs) ... Self-assembly formation of multi-walled carbon nanotubes on gold surfaces Nanoscale 2010, 2:2835 53 Lin JH, Chen CS, Rümmeli MH, Bachmatiuk A, Zeng ZY, Ma HL, Büchner B, Chen HW: Growth of Carbon Nanotubes...

Ngày tải lên: 21/06/2014, 04:20

... branched carbon nanotubes, a PECVD process A nm layer of nickel catalysts were deposited on a silicon wafer After the synthesis of VA -CNTs, a conformal layer of TiO2 was coated on the exterior of the ... low-temperature plasmaassisted growth of CNTs [27, 51], which was similar to the activation energy of surface diffusion of carbon atoms on polycrystalline Ni (0.3 eV) [52] Hoffman et al [51] suggested ... high energy of *100 eV and caused C–C bond breakage The presence of plasma radicals such as NHx and H further chemically etched the surface of the carbon nanotubes The growth mechanism of SWNT in...

Ngày tải lên: 21/06/2014, 07:20

... (l = 365 nm) for h, the replica mold was peeled off, providing a surface nanopillar-patterned NOA63 polymer layer formed on a PET film (Figure Page of 1b) For the generation of surface hydroxyl ... 2b) FE-SEM images of the surface of the sample treated for 15 showed that the pillar agglomeration and surface deformation continually progressed (Figure 3c), and after 30 of treatment (Figure ... FE-SEM images of the surface of samples treated with photooxidation for different periods of time Short exposure to UV radiation, e.g., (Figure 2a), did not significantly alter the surface, except...

Ngày tải lên: 21/06/2014, 17:20