Christmas Tree Reuse

The last seasonal item from the holidays comes from a team of researchers  in Allahabad, India that are in the process of developing a compound derived from the needles of the Douglas fir to help coat nano medical devices and combat infection.

One of the largest hurdles for biomedical devices is that bacteria invade implant sites, prosthetics, and tissues. The bionanocomposite from the Douglas fir could potentially cover implants and ward off microbial growth. Combining an extract from from the Douglas fir needles with silver nitrate solution, the team has created silver nanoparticles that can make a coating. The needle extract serves as a natural chemical reducing agent that converts silver ions in the nitrate solution into tiny nanoscopic silver metal particles

Nanotechnology and Nanoparticles

These tiny little things are used in all sorts of things we never hear about, but are changing our lives. Nanotechnology is a broad term that covers many areas of science, research, and technology. In its most basic form, it can be described as working with things that are small. Things so tiny that they can't be seen with standard microscopes. The same stuff that has always been there, but we just couldn't see it.

Here is a comparison - A nanoparticle size is compared to an ant as an ant is compared to the Indianapolis Motor Speedway.

More relative sizes: (nm is nanometer)
The head of a pin 1,000,000 nm across  You can see these with your eyes unaided
The page of a book 100,000 nm thick
A human hair 40,000 nm thick
A red blood cell 7,000 nm across You can see these using a light microscope
DNA molecule  2 nm wide
Most atoms  0.1–0.2 nm

During the next 20 years, nanotechnology will touch the life of nearly every person on the planet. Below is a guide to uses for some of these nano wonders.

Quantum dots - are made of semiconducting molecules, they glow fluorescently and are great at absorbing light. Used for more efficient solar cells and microscopy dyes for cell biology research.

Silica - silicon dioxide nanoparticles enable so-called shear thickening fluid to become stronger on impact. Used for stab-resistant Kevlar for body armor.

Zinc oxide - tiny crystals stop UV radiation and are toxic to microscopic life. Used for UV-resistant packaging, sunscreen, and paint and textiles that inhibit bacteria and fungi.
   
Nano barcodes - bits of various metals linked into tiny wires make good tags for microscopic things. Used for tracking DNA and cells.

Lithium iron phosphate - particles organize themselves into an anode, which allows batteries to charge and deliver power extremely quickly. Used for electric cars, power tools.

Iron oxide - mini magnets can stick to certain chemicals. Used for steering cancer drugs and genes to targets in the body while minimizing collateral damage. Sometimes smaller is better.