svaya tech overview for marblar nanoreactors v2
TRANSCRIPT
svayasvaya
svayananotechnologies
1
Scaled Nanoreactor Chemistry!
Svaya Nanotechnologies
svayasvaya
2
What’s Svaya up to?
Svaya Nanotechnologies
• Create a wide range of high-quality surface coatings at industrial scale (see slide 3)
• All based on MIT research on layer-by-layer assembly (explained in slide 4 & 5)
• Developed a method to load these films with metallic/semiconductor nanoparticles (see slide 6-7)
• Main application being developed: Ag-loaded antimicrobial films (slide 8)
• We’re now looking for new applications for this “nanoreactor” technique
svayasvayaPrecision and uniformity using simple processing
304/13/2023 Svaya Nanotechnologies
Biomimetic Structural Color Uniformity and Precision: reflectivity
Industrial Scale Processing
Using our methods we can create precise & uniform films over large scales. One example: reflective films based on alternating high- and low-refractive index layers.
svayasvaya
4
Our technology: Layer by Layer Assembly
Svaya Nanotechnologies
This is the technique we use to create all our coatings:• Gradually build up
multilayer nanoscale films
• Alternating deposition of +ve/-ve species (with rinsing steps)
• Water based solutions and chemistries
• Wide range of components
polymer polymer nanoparticlepolymer nanoparticle nanoparticle
50-2000 nm
svayasvaya
504/13/2023
High accuracy - “molecular beaker epitaxy”
Svaya Nanotechnologies
Ariga et al., Phys Chem Chem Phys (2007)
de Villiers et al., Advanced Drug Delivery Reviews 63:9, 701–715 (2011)
Robust charge reversal
Controlled Growth
Advantages of solution-based LbL methods• Linear growth of film thickness with layer number• No degradation in adsorption efficiency• Control comparable to vacuum-deposition methods like
molecular beam epitaxy (thus the nick-name), but at industrial scale
svayasvayaSome other examples of our LbL coatings
604/13/2023 Svaya Nanotechnologies
svayasvaya
7
Nanoreactor Chemistry – loading films with nanoparticles
Original lab-scale synthesis process
1. Coat substrate with poly(acrylic acid) PAA and poly(allylamine) PAH – by controlling pH, some fraction acid and amine groups will participate in ionic bonding, some fraction will remain neutral. PAA is a negatively charged polymer at these conditions and PAH is positively charged.
2. Soak film in solution containing metal salts and wait for ion exchange3. Expose film to reducing environment and generate metal nanoparticles. The
reaction groups in the films are regenerated, so can grow particles with repeated loading/reduction cycles.
Step 1 Step 2 Step 3
At Svaya, we’ve modified the process so we combine steps1 & 2 to make the process simpler and more scalable
COOH is regenerated!
svayasvayaControl of the synthesis – Silver, Gold, Copper, Iron, Lead, many more
process pH = 4.5 process pH = 3.5 process pH = 2.5
1x metal saltloading
5x metal saltloading
Bigger particles, more particles
svayasvayaExample: Deposition of silver loaded films
• Right after deposition, the coatings look transparent.• After a few hours they start to gain a purple tint, as Ag(+) is reduced to Ag(0)• Purple tint comes from nanoparticle absorbance of light
50 bilayers
25 bilayers
After heat treatment:metallic sheen
svayasvaya
Svaya NanotechnologiesCompany Confidential
1004/13/2023
Thank you! Excited to see your ideas for our
nanoreactor coatings