Chemistry Stack Exchange
Chemistry Stack Exchange

Questions tagged [nanotechnology]

For questions relating to the synthesis of supramolecular, or colloidal structures and their properties or manufacturing processes of characterization for nano-featured structures.

Nanotechnology ("nanotech") is manipulation of matter on an atomic, molecular, and supramolecular scale.

130 questions
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Why do nanoparticles have a different color than their macro counterparts?

It astonished me when I learned that at nanoscale, gold is no longer "gold",rather it's red. Other elements' nanoparticles also have a different color than their macro counterparts. Why does this phenomenon occur?
Mockingbird
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Solvent effect on gold nanoparticle and silver nanoparticle in UV spectroscopy?

Can anyone explain to me that how solvent factor affect the wavelength and intensity of gold nanoparticle and silver nanoparticle in UV spectroscopy?
Tianyu Zheng
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Discrepancy between preparation of yttrium aluminum garnet powder in a nonpreheated and preheated oven

I've made yttrium aluminum garnet (YAG) precursor powder and in my last batch, I placed one half of the powder to be annealed in a non-preheated oven (letting the powder heat up with the oven) and the other half of the powder, I placed it in the…
Jacqui Lee
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Nanoparticle tracking analysis versus transmission electron microscopy

I have various bimetallic nanoparticles which have formed alloys. I then used NTA and TEM to characterize the size of my nanoparticles. The TEM shows that the size of nanoparticles is considerably less than the NTA. Can anybody help explain the…
The Free Radical
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Are all lift-off resist negative photoresists?

Are all lift-off resist negative photoresists? I'm a bit confused as I can't find anything in my textbook/lecture slides about the type of resist used for lift-off.
user75484
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Any way that I can extract sugar from drinks? Without boiling the drinks

Any method? Materials, engineering, any technology. I am a product design student, so any possible method is useful to me. I am thinking to add this kind of technology into my concept.
Michael Yan
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Why does density increases when adding nanoparticles in a mixture of water and some clay?

I want to know that why density of drilling fluid which is a mixture of water, barrite, bentonite and carboxymethyl cellulose increases when i am adding silica nanoparticles. My ain of adding these nanoparticles is to improve the viscosity.
Vivek Raipuria
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How to calculate "accurate" surface area of a microporous material using Micromeritics equipment?

How do I get an accurate surface area from a nitrogen isotherm? I've been doing some surface areas on MOFs and upon showing my boss the isotherms he asked me to convert them to show the "range", which will give the most accurate surface area. I'm…
Mattzm
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Ni etching using nitric acid

I etched Ni film (200nm) coated on diamond substrate using 30% nitric acid. It worked well and I was able to remove the Ni in 1 minute. A few things I noted that I'm hoping to understand why they happened and if I could do something about…
JOHN
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Synthesis of silver nanoparticles

Synthesis of silver nanoparticles by electrochemical Method The silver content in these products consists of both silver ions and silver particles. Typically 90% of silver content is in the form of ionic silver and the remaining 10% of the silver…
Adnan AL-Amleh
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How can I remove a TiO2 coating from my car windows?

I've tried all the common solvents including hydrogen peroxide, chlorine, acetone. I tried a high speed sander with a rare earth polish. I have spoken to the head of the chemistry dept. at Cornell University and she said she did not have a remedy…
user53176
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What are nanoparticles made of?

No, really. I can't seem to find anything that properly explains this concept. What are nanoparticles? Are they charged metal ions held together by bridging ligands, or...?
FlyingFalcon
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