单壁碳纳米管放大:在一个特定类型的增长机制的道路上
Richard E Smalley1, Yubao Li, Valerie C Moore
1Department of Chemistry, the Carbon Nanotechnology Laboratory and the Smalley Institute for Nanoscale Science and Technology, Rice University, MS 222, Houston, Texas 77005, USA.
Journal of the American Chemical Society
|December 7, 2006
概括
研究人员展示了一种方法来放大单壁碳纳米管 (SWNTs) 使用模板蒸汽-液体-固体生长过程. 这种技术可以从小样本中大量生产特定的SWNT类型.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 化学工程是化学工程的重要组成部分.
背景情况:
- 目前合成特定单壁碳纳米管 (SWNT) 类型的方法有限,阻碍了大规模生产.
- 在纳米技术中,实现具有特定性 (n,m类型) 的SWNTs的受控合成是一个重大挑战.
- 扩大现有的SWNT的能力可以彻底改变它们对各种应用的可用性.
研究的目的:
- 开发一个概念验证,用模板增长方法来放大单个SWNT.
- 调查使用短SWNT作为种植更长,相同SWNT的模板的可行性.
- 为一种可扩展的方法奠定基础,以生产特定的n,m型SWNT.
主要方法:
- 用铁 (Fe) 盐功能化的短,末端碳化SWNT种子作为模板.
- 用乙烯 (C2H4) 作为碳来源,SWNT种子经受蒸汽-液体-固体 (VLS) 生长条件.
- 取消了聚合物包装,并将Fe盐减少到Fe(0) 催化剂,使VLS由SWNT种子模板成长.
主要成果:
- 通过VLS生长,使用短SWNT种子作为模板,成功种植了长SWNT.
- 分析证实,模板VLS种植的SWNT与原始种子具有相同的直径和表面方向.
- 原始SWNT的特定n,m类型的放大仍然需要被最终证明.
结论:
- 该研究提出了一种有前途的SWNT放大方法,该方法使用模板VLS增长.
- 这种方法证明了从种子模板中复制SWNT特征的潜力.
- 需要进一步的研究来确认精确的n,m类型放大,并优化大规模生产的过程.
相关概念视频
Enlargement of the Plasma Membrane
Cell division and enlargement are processes that require precise control. The control ensures that cell division cannot proceed unless the cell has grown to a specific size. A spherical, dividing cell requires an approximately 1.6X increase in its surface area to double its volume. The secretory pathway also has a significant role in cell membrane enlargement. Secretory vesicles that bud off from the Golgi apparatus and later fuse with the plasma membrane during exocytosis are a major source of...
Cells Coordinate Growth and Proliferation
Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
Mechanism of Lamellipodia Formation
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
Types of Membrane Protrusions
The protrusion of the cell surface is an initial step for several cellular processes, including cell migration, phagocytosis, and neurite outgrowth. These membrane protrusions are a result of cytoskeletal rearrangement. The most widely observed cell protrusions include lamellipodia, pseudopodia, filopodia, microvilli, invadopodia, and podosomes. These protrusions can be of two types — static or dynamic.
The microvilli, an example of stable protrusions, are finger-like projections with a...
The microvilli, an example of stable protrusions, are finger-like projections with a...
Cells Coordinate Growth and Proliferation
Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
Designing Growth Media for Bioreactors
Growth media provide essential nutrients that support cell growth and metabolism, thereby enhancing the yield of valuable products such as enzymes, antibiotics, and biomass. Designing an effective growth medium involves balancing all components to prevent nutrient limitations or toxic excesses, both of which can impair growth and reduce product yields.Composition of a Typical Growth MediumA typical growth medium contains carbon and nitrogen sources, salts, vitamins, trace elements, and...


