Sustainable approach toward synthesis of green functional carbonaceous 3-D micro/nanostructures from biomass

Ambient Conditions ◽

Step Process ◽

Novel Technique ◽

Electronic Sensing ◽

By Products

This study proposes a novel technique to synthesize functional carbonaceous three-dimensional (3-D) micro/ nanocompounds from agricultural by-products using femtosecond laser irradiation. Biowastes of rice husk and wheat straw are value-engineered to carbonaceous structures in a single-step process under ambient conditions. Our results demonstrate that by controlling the laser fluence, structures with a variety of different morphologies from nanostructures to microstructures can be achieved. Also, the results indicate that altering the laser processing parameters influences the chemical composition of the synthesized structures. This sustainable approach presents an important step towards synthesizing 3-D micro/nanofibrous compounds from biowaste materials. These structures, as-synthesized or as nanocomposite fillers, can have practical uses in electronic, sensing, biological, and environmental applications.

Sustainable approach toward synthesis of green functional carbonaceous 3-D micro/nanostructures from biomass

10.32920/14637894.v1 ◽

2021 ◽

Author(s):

Amirhossein Tavangar ◽

Bo Tan ◽

Krishnan Venkatakrishnan

Keyword(s):

Laser Processing ◽

Three Dimensional ◽

Processing Parameters ◽

Single Step ◽

Ambient Conditions ◽

Step Process ◽

Novel Technique ◽

Electronic Sensing ◽

By Products

This study proposes a novel technique to synthesize functional carbonaceous three-dimensional (3-D) micro/ nanocompounds from agricultural by-products using femtosecond laser irradiation. Biowastes of rice husk and wheat straw are value-engineered to carbonaceous structures in a single-step process under ambient conditions. Our results demonstrate that by controlling the laser fluence, structures with a variety of different morphologies from nanostructures to microstructures can be achieved. Also, the results indicate that altering the laser processing parameters influences the chemical composition of the synthesized structures. This sustainable approach presents an important step towards synthesizing 3-D micro/nanofibrous compounds from biowaste materials. These structures, as-synthesized or as nanocomposite fillers, can have practical uses in electronic, sensing, biological, and environmental applications.

Sustainable approach toward synthesis of green functional carbonaceous 3-D micro/nanostructures from biomass

10.32920/ryerson.14669034 ◽

2021 ◽

Author(s):

Amirhossein Tavangar ◽

Bo Tan ◽

Krishnan Venkatakrishnan

Keyword(s):

Laser Processing ◽

Three Dimensional ◽

Processing Parameters ◽

Single Step ◽

Ambient Conditions ◽

Step Process ◽

Novel Technique ◽

Electronic Sensing ◽

By Products

This study proposes a novel technique to synthesize functional carbonaceous three-dimensional (3-D) micro/ nanocompounds from agricultural by-products using femtosecond laser irradiation. Biowastes of rice husk and wheat straw are value-engineered to carbonaceous structures in a single-step process under ambient conditions. Our results demonstrate that by controlling the laser fluence, structures with a variety of different morphologies from nanostructures to microstructures can be achieved. Also, the results indicate that altering the laser processing parameters influences the chemical composition of the synthesized structures. This sustainable approach presents an important step towards synthesizing 3-D micro/nanofibrous compounds from biowaste materials. These structures, as-synthesized or as nanocomposite fillers, can have practical uses in electronic, sensing, biological, and environmental applications.

Synthesis of three-dimensional calcium carbonate nanofibrous structure from eggshell using femtosecond laser ablation

10.32920/14640117.v1 ◽

2021 ◽

Author(s):

Amirhossein Tavangar ◽

Bo Tan ◽

Krishnan Venkatakrishnan

Keyword(s):

Calcium Carbonate ◽

Femtosecond Laser ◽

Three Dimensional ◽

Bone Substitutes ◽

Cell Interaction ◽

Single Step ◽

Ambient Conditions ◽

Functional Biomaterials

Background Natural biomaterials from bone-like minerals derived from avian eggshells have been considered as promising bone substitutes owing to their biodegradability, abundance, and lower price in comparison with synthetic biomaterials. However, cell adhesion to bulk biomaterials is poor and surface modifications are required to improve biomaterial-cell interaction. Three-dimensional (3D) nanostructures are preferred to act as growth support platforms for bone and stem cells. Although there have been several studies on generating nanoparticles from eggshells, no research has been reported on synthesizing 3D nanofibrous structures. Results In this study, we propose a novel technique to synthesize 3D calcium carbonate interwoven nanofibrous platforms from eggshells using high repetition femtosecond laser irradiation. The eggshell waste is value engineered to calcium carbonate nanofibrous layer in a single step under ambient conditions. Our striking results demonstrate that by controlling the laser pulse repetition, nanostructures with different nanofiber density can be achieved. This approach presents an important step towards synthesizing 3D interwoven nanofibrous platforms from natural biomaterials. Conclusion The synthesized 3D nanofibrous structures can promote biomaterial interfacial properties to improve cell-platform surface interaction and develop new functional biomaterials for a variety of biomedical applications.

Synthesis of three-dimensional calcium carbonate nanofibrous structure from eggshell using femtosecond laser ablation

10.32920/14640117 ◽

2021 ◽

Author(s):

Amirhossein Tavangar ◽

Bo Tan ◽

Krishnan Venkatakrishnan

Keyword(s):

Calcium Carbonate ◽

Femtosecond Laser ◽

Three Dimensional ◽

Bone Substitutes ◽

Cell Interaction ◽

Single Step ◽

Ambient Conditions ◽

Functional Biomaterials

Background Natural biomaterials from bone-like minerals derived from avian eggshells have been considered as promising bone substitutes owing to their biodegradability, abundance, and lower price in comparison with synthetic biomaterials. However, cell adhesion to bulk biomaterials is poor and surface modifications are required to improve biomaterial-cell interaction. Three-dimensional (3D) nanostructures are preferred to act as growth support platforms for bone and stem cells. Although there have been several studies on generating nanoparticles from eggshells, no research has been reported on synthesizing 3D nanofibrous structures. Results In this study, we propose a novel technique to synthesize 3D calcium carbonate interwoven nanofibrous platforms from eggshells using high repetition femtosecond laser irradiation. The eggshell waste is value engineered to calcium carbonate nanofibrous layer in a single step under ambient conditions. Our striking results demonstrate that by controlling the laser pulse repetition, nanostructures with different nanofiber density can be achieved. This approach presents an important step towards synthesizing 3D interwoven nanofibrous platforms from natural biomaterials. Conclusion The synthesized 3D nanofibrous structures can promote biomaterial interfacial properties to improve cell-platform surface interaction and develop new functional biomaterials for a variety of biomedical applications.

Synthesis of Nanotips Through Femtosecond Laser Ablation of Glass with Assisted Gas

10.32920/ryerson.14656779.v1 ◽

2021 ◽

Author(s):

Nikunj Patel

Keyword(s):

Femtosecond Laser ◽

Building Materials ◽

High Vacuum ◽

Synthesis Method ◽

Target Surface ◽

Laser Pulses ◽

Single Step ◽

Ambient Conditions

Nanotips are the key nanostructures for many applications. Until now, the nanotips of only the crystalline materials have been produced via various deposition methods which require sophisticated equipment, high vacuum, and clean room operations. This thesis proposes a single step, rapid synthesis method using femtosecond laser irradiation at megahertz frequency with background flow of nitrogen gas at ambient conditions. Amorphous nanotips are obtained without the use of catalyst. The nanotips grow from highly energetic plasma generated when target is irradiated with laser pulses. The vapor condensates, nanoparticles and droplets from the plasma get deposited back on to the hot target surface where they experience force imbalance due to which the stems for the nanotips growth are initiated. Once the stems are generated, the continuous deposition of vapor condensates [sic] provides building materials to the stems to complete the growth of nanotips. Further study found that the growth of the nanotips is influenced by laser parameters and gas conditions.

Synthesis of bio-functionalized three-dimensional titania nanofibrous 3 using femtosecond laser ablation

10.32920/14638530.v1 ◽

2021 ◽

Author(s):

Amirhossein Tavangar ◽

Bo Tan ◽

Krishnan Venkatakrishnan

Keyword(s):

Femtosecond Laser ◽

Three Dimensional ◽

Titanium Substrate ◽

Chemical Properties ◽

Cell Interaction ◽

Primary Objective ◽

Ambient Conditions

The primary objective of current tissue regeneration research is to synthesize nano-based platforms that 24 can induce guided, controlled, and rapid healing. Titanium nanotubes have been extensively considered 25 as a new biomaterial for biosensors, implants, cell growth, tissue engineering, and drug delivery systems. 26 However, cell adhesion to nanotubes is poor due to their chemical inertness, as well as the one-dimen- 27 sional structure, and surface modification is required to enhance nanotube–cell interaction. While there 28 have been a considerable number of studies on growing titanium nanotubes, synthesizing a three-dimen- 29 sional (3-D) nano-architecture which can act as a growth support platform for bone and stem cells has 30 not been reported so far. Therefore, we present a novel technique to synthesize and grow 3-D titania 31 interwoven nanofibrous structures on a titanium substrate using femtosecond laser irradiation under 32 ambient conditions. This surface architecture incorporate the functions of 3-D nano-scaled topography 33 and modified chemical properties to improve osseointegration while at the same time leaving space to 34 deliver other functional agents. The results indicate that laser pulse repetition can control the density 35 and pore size of engineered nanofibrous structures. In vitro experiments reveal that the titania nanofi- 36 brous architecture possesses excellent bioactivity and can induce rapid, uniform, and controllable 37 bone-like apatite precipitation once immersed in simulated body fluid (SBF). This approach to synthesiz- 38 ing 3-D titania nanofibrous structures suggests considerable promise for the promotion of Ti interfacial 39 properties to develop new functional biomaterials for various biomedical applications.

Single-step fabrication of microfluidic channels filled with nanofibrous membrane using femtosecond laser irradiation

10.32920/14636256.v1 ◽

2021 ◽

Author(s):

Amirhossein Tavangar ◽

Bo Tan ◽

Krishnan Venkatakrishnan

Keyword(s):

Femtosecond Laser ◽

Laser Irradiation ◽

Microfluidic Channel ◽

Scanning Speed ◽

Single Step ◽

Microfluidic Channels ◽

Ambient Conditions ◽

Nanofibrous Structure ◽

Channel Surface

In this paper, we demonstrate a new method of fabricating silicon microfluidic channels filled with a porous nanofibrous structure utilizing a femtosecond laser. The nanofibrous structure can act as a membrane used for microfiltration. This method allows us to generate both the microfluidic channel and the fibrous nanostructure in a single step under ambient conditions. Due to laser irradiation, a large number of nanoparticles ablate from the channel surface, and then aggregate and grow into porous nanofibrous structures and fill the channels. Energy dispersive x-ray spectroscopy (EDS) analysis was conducted to examine the oxygen concentration in the membrane structure. Our results demonstrated that by controlling the laser parameters including pulse repetition, pulse width and scanning speed, different microfluidic channels with a variety of porosity could be obtained.

Experimental Investigation Of Nanostructures Generated On Glasses Using A MHz Femtosecond Laser

10.32920/ryerson.14648571 ◽

2021 ◽

Author(s):

Dheeraj Vipparty

Keyword(s):

Femtosecond Laser ◽

Laser Irradiation ◽

Dwell Time ◽

Three Dimensional ◽

Soda Lime ◽

Soda Lime Glass ◽

Ambient Conditions ◽

Nanoparticle Agglomerate ◽

Insight Into

This dissertation reports the synthesis of unique Si0₂ based nanostructures by exposing glass samples to MHz repletion rate femtosecond laser irradiation. A three-dimensional fibrous nanoparticle agglomerate network was observed on soda-lime glass (73% SiO + other compounds) when exposed to femtosecond laser irradiation at 8.4 MHz and 12.6 MHz repetition rate and 0.5 ms dwell time, in air. By irradiating silica glass (96% SiO₂+ trace elements) sample under ambient conditions with femtosecond pulses at 12.6 MHz and dwell time in excess of 3.0 ms; long continuous nanofibers of extremely high aspect ration (certain fibers up to 100000:1) were obtained. The mechanisms that promote such nanostructures with distinct morphologies have been explored. A deeper insight into the fundamentals of femtosecond laser interaction with dielectrics led to the understanding that variations in bandgap alters ablation dynamics and dictates the response of glass to femtosecond laser irradiation, ultimately resulting in the formation of structures with dissimilar morphology on silica and soda-lime glass.

Experimental Investigation Of Nanostructures Generated On Glasses Using A MHz Femtosecond Laser

10.32920/ryerson.14648571.v1 ◽

2021 ◽

Author(s):

Dheeraj Vipparty

Keyword(s):

Femtosecond Laser ◽

Laser Irradiation ◽

Dwell Time ◽

Three Dimensional ◽

Soda Lime ◽

Soda Lime Glass ◽

Ambient Conditions ◽

Nanoparticle Agglomerate ◽

Insight Into

This dissertation reports the synthesis of unique Si0₂ based nanostructures by exposing glass samples to MHz repletion rate femtosecond laser irradiation. A three-dimensional fibrous nanoparticle agglomerate network was observed on soda-lime glass (73% SiO + other compounds) when exposed to femtosecond laser irradiation at 8.4 MHz and 12.6 MHz repetition rate and 0.5 ms dwell time, in air. By irradiating silica glass (96% SiO₂+ trace elements) sample under ambient conditions with femtosecond pulses at 12.6 MHz and dwell time in excess of 3.0 ms; long continuous nanofibers of extremely high aspect ration (certain fibers up to 100000:1) were obtained. The mechanisms that promote such nanostructures with distinct morphologies have been explored. A deeper insight into the fundamentals of femtosecond laser interaction with dielectrics led to the understanding that variations in bandgap alters ablation dynamics and dictates the response of glass to femtosecond laser irradiation, ultimately resulting in the formation of structures with dissimilar morphology on silica and soda-lime glass.