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Mesoporous SBA-15 in the biological separation and preparation of nanometer materials and related research on the application of

Author: GaoFeng
Tutor: ZhaoDongYuan
School: Fudan University
Course: Physical and chemical
Keywords: Mesoporous SBA-15 Biological macromolecules Separate Low-dimensional Nanomaterials Synthesis
CLC: TB383
Type: PhD thesis
Year: 2003
Downloads: 1148
Quote: 1
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Abstract

Mesoporous materials have large specific surface area and pore volume, pore size in the nanometer size uniform and adjustable, controlled morphology, surface functional groups and a series of easy to characteristics, which in the separation of biological macromolecules as well as the size and dimensions of nanomaterials control has broad application prospects. Currently mesoporous materials development has gradually transformed to the application of mesoporous materials, but assembled in separation applications and nano science and other aspects still only in its infancy. In this paper, we choose to mesoporous SBA-15 in the separation of biological macromolecules and nanomaterials assembly of the application and its related fields of research as our research direction, this direction involves both the life sciences, nano-science and media Hole materials science and other major hot areas, has a certain theoretical and practical significance. In this work, including the following: In the second chapter, we adjust the synthesis conditions more uniform spherical prepared mesoporous SBA-15, and its surface was modified to meet the requirements of liquid chromatography. C18 in the surface-modified mesoporous SBA-15 as a filler high pressure liquid chromatography, were realized on the molecular weights of biological molecules of various sizes, including small biomolecules (cysteine, dopamine, glutathione, and 6 - mercapto- purine), peptides (myoglobin and bovine serum albumin tryptic hydrolyzate) and protein (lysozyme, myoglobin and egg white protein) good separation. Compared to the commercial C18 column, C18-SBA-15 results in the separation column, the actual plate number and resolution, etc. show better nature, but also reflects the good separation reproducibility initially confirmed the referral Hole SBA-15 as liquid chromatography packing material has good application prospects. In addition, we also examined the mesoporous SBA-15 materials, the nature of protein adsorption and desorption, and by adjusting the pore size of SBA-15, SBA-15 as well as a certain degree of surface modification, to the separation of the molecular weight proteins of different sizes purposes. In the third chapter, we develop in situ adsorption method, the first of SBA-15 mesoporous thiol-modified surface, and then use a mercapto group and a metal ion adsorption of Pb2 Pb ions adsorbed to the pores, and finally under certain conditions so that the two react to obtain binary metal sulfide PbS nanoparticles. The resulting PbS nanoparticles uniformly dispersed in the pores of SBA-15, and has a uniform particle size (6 nm). The advantage of this method is non-reactive under the conditions of two different inorganic component introduced into the pores of the mesoporous material, so as to effectively solve the conventional impregnation method easily cause pore blockage, but also by changing the use of SBA- 15 template pore size, can be successfully achieved within the mesopores nanometer particle size control. This approach can be extended to other two yuan sulfide, such as CdS nanoparticles synthesis. In the fourth chapter, we sulfide nanoparticles synthesized on the basis of the experimental conditions by changing, succeeded in mesoporous SBA-15 synthesized within the pores of this binary sulfide nanowires. Situ assay synthesis of nanomaterials, to achieve the nanowires from nanoparticles to change, you must go pores of mesoporous materials introduce more inorganic reactant. In this chapter, we use alcohol extraction method instead of the original high-temperature calcination to remove the synthesis of mesoporous materials required surfactant, thereby avoiding high temperature roasting mesoporous materials caused a significant reduction in the surface silanols, maintaining SBA-15 The amount of surface silanol groups, and to improve surface modification of the thiol group lt; WP = 6 gt; weight and amount of adsorption of metal ions, up to the channels of the purpose of introducing more inorganic components, in the channel to achieve the sulfide from Nanowires nanoparticles to change. We first synthesized having a uniform diameter (6 nm) of PbS nanowires, it will also be extended to other sulfide nanowires, such as CdS, Ag2S nanowires, which is the first on the pore mesoporous materials Synthesis of two yuan sulfide nanowires were reported. Compared with the mesoporous oxide material, the structure of non-oxide dielectric materials, particularly metal chalcogenide compound semiconductor material, due to a space and the non-conductive semiconductor material continuous periodic quantum dot array structure may be provide unique optical and electrical properties will be advanced electronic and optoelectronic nanodevices preparation and so has important applications. Sulphide has been synthesized structural materials have dielectric walls are amorphous materials, thermal stability, surface active agent will lead to the removal of the structure and collapse mediated shortcomings greatly limits their practical application. In the fifth chapter, we use a simple single precursor decomposition and SBA-15 Template combination of methods at a lower temperature synthesis of high specific surface area (101 m2 / g) stable mesoporous crystalline CdS materials. The use of a single precursor [Cd10S16C32H80N4O26] CdS mesoporous materials is the key to successfully synthesized, it contains a lot of Cd and S, and can be generated in situ decomposition of CdS nanocrystals, so that you can in a non-reaction conditions and make the large scale introduction of inorganic sources in situ decomposition of the inorganic species, thus solving the introduction channel blocking problems caused. This is the first report with crystal walls of mesoporous materials, enriched mesoporous materials composed of nano-devices will likely have a significant role in the development. In the use of SBA-15 as template to synthesize CdS mesoporous materials, we will introduce this single precursor to the soft template, explore the CdS nanocrystals in the assembly behavior of soft template to synthesize a novel by CdS nanoclusters to build a uniform nanospheres. In the use of mesoporous materials as a hard template synthesis of nanomaterials at the same time, we also developed a template and a solvent thermal method of combining to achieve control of nanomaterials synthesis and assembly. In the sixth chapter, we use a surfactant and a strong chelating agent to control the synthesis and assembly of nanomaterials, respectively, use the eight - hydroxyquinoline, dodecyl mercaptan as templating agent in solvothermal conditions, respectively the realization of the CdS nanowire length and axial ratio control, and build a structure having a dobby controlled synthesis of CdS nanorods and various Ag2S superlattice structure. Use the eight - hydroxyquinoline and ethylenediamine synergistic role in controlling the diameter of CdS nanorods essentially the same, but the length of 300 nm ~ 3.0 (m adjustable range; use synergy dodecanethiol and ethylenediamine role, and won in cubic CdS crystal nucleus to hexagonal CdS [001] direction of growth of nanorods as arms Dobby CdS nanorods structure; with dodecanethiol as structure-directing agent, get the Ag2S nanoparticles and nanorods orthogonal two-dimensional and two-dimensional hexagonal structure.

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