3 Bio-nanotechnology Application in Wastewater Treatment
47
nanotubes and nanowires by ablating solid materials in laser liquid media. Recently,
researchers benefit from laser ablation in liquid appropriately because of the unique
properties of nanotechnology with new and changing morphologies (Lin et al. 2010).
Formation of nanoparticles using laser ablation at surface plasmon resonance frequencies can supply an efficient means of changing sizes and shapes of NPs. That
is specially, so because the sizes of the particles, along with the surface-absorbing
species and the insulating medium, influence the situation and form plasmon absorption. The application of laser ablation on a huge numeral of materials is possible. It is
easy and eco-friendly for producing nanoparticles with a trend to synthesis distributions of relatively large size (Burakov et al. 2005). There are frequent reports on using
Nd:YAG laser to synthesize metal nanoparticles. This laser Nd:YAG (Neodymium
doped Yttrium Aluminium Garnet) has a short length. That is convenient for pulse
applications requiring more profound breakthrough, covering smaller areas as well
as precise processing for specified purposes. Laser Nd-YAG is a practical option
for procedure involving various modifications occurring in a short period. In such
procedure, the laser energy as well as reaction period is decisive (Majumdar and
Manna 2003). Pules laser ablation in liquid is a promising, multilateral, easy, and
technical technology with a broad zone of attainable materials. Laser ablation has
been used in the production of varied nanoscale structures. Pulse laser ablation in liquid of NPs results in the formation of self-regulating nanostructure materials which
sizes are monitored based on the pulse period (Barmina et al. 2010). Modification
of nanoparticles by laser irradiation includes nanorods, nanocubes structures and
related nanostructures, arranged arrays of NPs, and heterogeneous structures (Kim
et al. 2017).
3.4.4 Reshaping and Fragmentation of Metal NPs Using
Laser Irradiation
The modification of Ag NPs shape with laser pulse involves the interaction of laser
radiation in resonance with nanoparticles for transformations to plasmonic nanocrystals. The first investigations of the effect of laser pulses on the colloidal dispersions
of spherical NPs showed that reshaping and fragmentation were the significant influences caused by the intensity of the laser pulse (Kurita et al. 1998). In 2000, Link.
et al. used laser pulses at high influence for fragmentation and reshaping of nanomaterials into sphere nanoparticles (Link et al. 2000). The fragmentation and reshaping
phenomena are dominated by the electron dynamics of the nanomaterials and the
relaxation procedure after laser irradiation, photons are absorbed when laser excitation is subjected, producing fast thermal electrons, followed by energy of electron lattice transfer and that heat transport to the surrounding (Ahmadi et al. 1996;
Logunov et al. 1997).
Laser irradiation at nanosecond pulse experiments, the absorption of photons continues, when the relaxation procedures start and still lattice hot, yielding an increase
47
nanotubes and nanowires by ablating solid materials in laser liquid media. Recently,
researchers benefit from laser ablation in liquid appropriately because of the unique
properties of nanotechnology with new and changing morphologies (Lin et al. 2010).
Formation of nanoparticles using laser ablation at surface plasmon resonance frequencies can supply an efficient means of changing sizes and shapes of NPs. That
is specially, so because the sizes of the particles, along with the surface-absorbing
species and the insulating medium, influence the situation and form plasmon absorption. The application of laser ablation on a huge numeral of materials is possible. It is
easy and eco-friendly for producing nanoparticles with a trend to synthesis distributions of relatively large size (Burakov et al. 2005). There are frequent reports on using
Nd:YAG laser to synthesize metal nanoparticles. This laser Nd:YAG (Neodymium
doped Yttrium Aluminium Garnet) has a short length. That is convenient for pulse
applications requiring more profound breakthrough, covering smaller areas as well
as precise processing for specified purposes. Laser Nd-YAG is a practical option
for procedure involving various modifications occurring in a short period. In such
procedure, the laser energy as well as reaction period is decisive (Majumdar and
Manna 2003). Pules laser ablation in liquid is a promising, multilateral, easy, and
technical technology with a broad zone of attainable materials. Laser ablation has
been used in the production of varied nanoscale structures. Pulse laser ablation in liquid of NPs results in the formation of self-regulating nanostructure materials which
sizes are monitored based on the pulse period (Barmina et al. 2010). Modification
of nanoparticles by laser irradiation includes nanorods, nanocubes structures and
related nanostructures, arranged arrays of NPs, and heterogeneous structures (Kim
et al. 2017).
3.4.4 Reshaping and Fragmentation of Metal NPs Using
Laser Irradiation
The modification of Ag NPs shape with laser pulse involves the interaction of laser
radiation in resonance with nanoparticles for transformations to plasmonic nanocrystals. The first investigations of the effect of laser pulses on the colloidal dispersions
of spherical NPs showed that reshaping and fragmentation were the significant influences caused by the intensity of the laser pulse (Kurita et al. 1998). In 2000, Link.
et al. used laser pulses at high influence for fragmentation and reshaping of nanomaterials into sphere nanoparticles (Link et al. 2000). The fragmentation and reshaping
phenomena are dominated by the electron dynamics of the nanomaterials and the
relaxation procedure after laser irradiation, photons are absorbed when laser excitation is subjected, producing fast thermal electrons, followed by energy of electron lattice transfer and that heat transport to the surrounding (Ahmadi et al. 1996;
Logunov et al. 1997).
Laser irradiation at nanosecond pulse experiments, the absorption of photons continues, when the relaxation procedures start and still lattice hot, yielding an increase