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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.

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20 views

Can iron oxide nanoparticles form with diamagnetic surfactants? [closed]

When using charged surfactants, such as oleic acid the preparing iron oxide nanoparticles, what would result from utilizing a charged surfactant with a negative magnetic susceptibility?
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9 views

What are the diameter-dependent properties of nanotubes?

since the diameter can affect (n,m) in the chiral vector C = na1 + ma hence properties associated with (n,m) would also change. would this be true ?
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32 views

How to prepare an emulsion (compounds in wt%)

I am trying to replicate an experiment to generate microparticles but I found myself confused about how to prepare the ingredients as some need to be weighed and dissolved before and I think the ...
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17 views

Can two two-material composite precipitation methods be used to make one three-material composite?

There are many methods used in the synthesis of cellulose nanocomposites, including Fe₃O₄@Cellulose in urea, ammonia, and water solution and immersing the product in sulfuric acid, or somewhat ...
3
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1answer
61 views

Why don't carbon nanotubes behave like quantum dots?

If carbon nanotubes (CNTs) have the size required to have an bound electron energy state, why don't CNTs behave like quantum dots, such as having optical tunability, amongst other properties?
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21 views

Nanocomposite hydrogel for wet adehsion in biomedical applications

My name‘s Tristan and I‘m a bachelor‘s student in Germany. I‘m trying to synthesize an injectable nanocomposite hydrogel for wound closure and wound healing applications. The problem is that, next to ...
4
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1answer
33 views

Practical to measure topography of a large area (mm-scale) with scanning probe microscopy (SPM)?

I'm currently very new to nanotechnology. I do understand that it is possible to achieve an excellent topography image of a sample by SPM. However, is it possible to do SPM over a large area (for ...
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51 views

How does the surface to volume ratio of ions and their distribution in solution compare to that of suspended nanoparticles in nanofluids?

I am interested in understanding the heat transfer capabilities of fluids. Nano-fluids are suspensions of nanoparticles (1-100nm sized particles) in a base fluid, often water, oil or glycol. These ...
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0answers
17 views

How carbon nanotube sensors works?

How carbon nanotube sensors works? Is the protein (or chemical compound used as part of the sensor) placed inside the tube or where is it placed? and how is the technology used to place the protein ...
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0answers
13 views

Calculating nanocluster's Lewis acidity

In general, fluoride ion affinity, ammonia binding energy, photoacoustic IR spectra of adsorbed species (pyridine, CO) are used to measure the Lewis acidity of a material. But in the computer ...
5
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2answers
62 views

Why are nanoliposome encapsulated antibiotics still so unavailable despite being so effective?

I wasnt sure how the phrase the headline question really nor if this is the right place to ask it, but i'm primarily interested in the chemical synthesis aspect and the experience of chemists ...
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15 views

Carbon Nanotube Host Molecule

I have seen several chemical papers on where carbon nanotubes are made into host-guest molecules, with the researchers inserting molecules or ions inside the tubes. These talk about the properties of ...
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1answer
32 views

Miller Indices of Goldnanoparticles from Turkevich and Frens method

I need the miller indices of gold nanoparticles that were synthesized after the route of Turkevich and Frens. I during my research I found a lot of publications, but it looks like no one measured it ...
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2answers
123 views

How to get the coordinates or .cif file of β𝟏𝟐 𝐛𝐨𝐫𝐨𝐩𝐡𝐞𝐧𝐞 and χ𝟑 𝐛𝐨𝐫𝐨𝐩𝐡𝐞𝐧𝐞?

Can someone tell me how to draw the β𝟏𝟐 𝐛𝐨𝐫𝐨𝐩𝐡𝐞𝐧𝐞 and χ𝟑 𝐛𝐨𝐫𝐨𝐩𝐡𝐞𝐧𝐞 in Materials Studio or any other software? I've just started my project work, and I'm a beginner in this field. ...
1
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1answer
64 views

Exactly how the subscripted numbers are given to the different types of boron sheets (borophenes)?

I was going to start a project on Borophene, and hence I was going through a review journal, 2D Boron: Boraphene, Borophene, Boronene, where they have said many types of borophenes had been proposed. ...
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28 views

How is ECR (Electron Counting Rule) done in a structure?

I've been told how to apply the ECR to GaAs{001}(2×4) in my lectures but it makes no sense to me and I don't seem to be able to find any other sources that explain this. (This is a further question on ...
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96 views

Stress-Strain Graph Under Uniaxial and Biaxial Strain

I was going through a recently published journal paper by ACS (Applied Nano Materials) about gas separation using nanoporous Graphene. DOI No. - https://dx.doi.org/10.1021/acsanm.0c02340 Supporting ...
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39 views

Reaction analogous to burning that causes cooling rather than releasing heat [closed]

Is it physically and chemically possible to design both a gas and a solid substance, such that there would be a technologically feasible initiation of a chain reaction analogous to the spark that ...
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0answers
14 views

Create metallic nanstructure on aluminum or copper film

I want to etch Al/Cu film (0.05 mm thick) to create nanopatterns on to the surface of the film. The etched surface should be metallic. The idea is to develop a simple tribolectric nanogenerator with ...
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32 views

Keeping a catalyst suspension suspended

I am currently working on a heterogeneous photocatalyst project. We are having significant problems with the catalyst not staying suspended in an aqueous solution. What can I do to prevent ...
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0answers
12 views

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 ...
4
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1answer
124 views

Fractional index in a chemical formula of metal oxide

I have just read an article in which they used $\ce{WO3}$ and $\ce{WO_{2.9}}$ as precursors, whose objective was to form $\ce{WS2}$, in an atmosphere of argon by CVD. In one boat there is the powder ...
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127 views

Estimating maximum size of magnetite particles in this Nile Red ferrofluid video?

In the Nile Red video Making ferrofluid from scratch a suspension of small magnetite ($\ce{Fe^{2+}Fe_2^{3+}O_4^{2−}}$) particles is produced from a combination of ferrous chloride and ferric chloride. ...
2
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1answer
68 views

Nano coatings reaction with Al bottles

I have a question regarding nano coatings based on the formula "modified $\ce{SiO2}$". I have been told that $\ce{Al}$ bottles react with substances with a $\mathrm{pH}$ value below 3 or above 9. ...
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48 views

Is there a cheap and effective way to make PdZn-Ag foam?

I am trying to design a machine that can convert carbon dioxide into methanol and/or hydrocarbons. My design requires PdZn-Ag foam (nanoparticles), which is made by depositing palladium-zinc vapor ...
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90 views

Synthesis of silver nanoparticles [closed]

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 ...
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1answer
157 views

Are all stable Xenes (graphene-like 2D honeycomb sheets) buckled?

background: Per this abstract Silicene, germanene and stanene are part of a monoelemental class of two-dimensional (2D) crystals termed 2D-Xenes (X = Si, Ge, Sn and so on) which, together with ...
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1answer
456 views

Why does the displacement reaction of zinc in copper(II) sulfate solution result in dark metallic copper?

It is commonly known that when zinc metal is placed in a solution of copper(II) sulfate, a displacement reaction occurs, and elemental copper is deposited onto the decomposing zinc metal. A practical ...
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0answers
20 views

Modification of Janus nanoparticles [closed]

I would like to synthesis gold/polyacrylic acid (PAA) Janus nanoparticles in solution. Any ideas how I can functionalize gold with a photosensitizer and PAA with an antibody so that there would be no ...
2
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35 views

What is the approximate cost per unit length to synthesize carbon nanotubes free of defects? [closed]

As implied near the end of this article, carbon nanotube fibers have been synthesized in chunks on the order of about a centimeter in length (Fei Wei at Tsinghua University in 2018). What is the cost ...
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73 views

Has there been any independent verification of the results from this Chinese nanotube study?

Watts up referred to the South China Morning Post in reporting that a Tsinghua University team led by Wei Fei claimed in 2018 to have manufactured carbon nanotube fibre with tensile strength of 80 ...
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2answers
312 views

Generating colloids / nano-particles from palladium and platinum wire

I know I can generate colloidal silver from the following link generate colloidal silver I now have 2 palladium and 2 platinum wires and would like to make one colloidal solution of palladium and one ...
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1answer
35 views

Sample: How to calculate mass of nanopaticles with given density and Vol % [closed]

I'm trying to calculate the wt% and the mass of the nanoparticles in a ferrofluid solution. Attached is data from the supplier: ...
4
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1answer
90 views

Nanocar racing competition and the race tracks used

In the Nanocar race competition the molecules are raced on a gold surface. Is there a specific property of gold that it forms a good "racetrack"? On what criteria does it compare with other metal ...
4
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1answer
176 views

What is the crystal structure of bismuth oxyhydroxyphosphate (BOHP)?

The recent Chemical & Engineering News article Photocatalyst shreds drinking water contaminant PFOA report the following: Cates and his colleagues made an accidental breakthrough while testing ...
1
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1answer
65 views

Spraying aluminium hydroxide nanoparticles onto PLA as fire retardant?

Several scientific papers study FR-PLA (fire resistant PLA) in which Aluminium Hydroxide nanoparticles are melt blended into the PLA (example source: Advances in Flame Retardant Poly(Lactic Acid). ...
2
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1answer
50 views

Nanoparticle tracking analysis v.s Transmission Electron Microscope

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 ...
4
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0answers
41 views

Nanoparticle Alloys (Gold-Silver) not forming

I have synthesised what I thought were gold-silver alloys at various different compositions. The UV/vis data showed that nanoparticles alloys with a majority of the composition made from gold had one ...
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1answer
91 views

Characterisation of gold-silver alloy nanoparticle

I have various compositions of gold-silver alloy nanoparticles. I would like to characterize my nanoparticles and confirm that they are alloys. Aside from the qualitative analysis of the colour and ...
2
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1answer
31 views

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.
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1answer
49 views

What are nanoparticles made of? [closed]

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...?
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681 views

Why is bis(1,2,2,6,6-Pentamethyl-4-Piperidinyl) Sebacate used as a "bottom coat" for a superhydrophobic coating?

According to this MSDS sheet, a compound named bis(1,2,2,6,6-Pentamethyl-4-Piperidinyl) Sebacate is used in the "bottom coat" layer before a "top coat" of superhydrophobic NeverWet coating is applied. ...
2
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1answer
503 views

What is 'desorption hysteresis'?

I am currently reading a paper titled "Polystyrene Nanoplastics-Enhanced Contaminant Transport: Role of Irreversible Adsorption in Glassy Polymeric Domain" (link here). In the paper, the authors ...
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1answer
44 views

Lyophilization Advantage

I've been reading about freeze drying and how it increases the shelf life of certain foods and is overall a good preserving technique. My question is with regard to the actual process. I understand ...
2
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1answer
190 views

how to manufacture PTC ink

I am trying to create a PTC ink similar to Henkel ECI8120 , I researched PTC rubber and found that it was Polydimethylsiloxane (PDMS) loaded carbon nanoparticles, I was wondering if anyone here has ...
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1answer
107 views

Help with Carbon Fibre

I'm having trouble finding articles about carbon fibre that don't contradict other articles. I just have a few questions about the atomic structure and the intermolecular and intramolecular forces. ...
1
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1answer
92 views

how to avoid bubble formation in hexane

I have faced this problems when I was working in lab with hexane for the first time. I was trying to guide dispersion of nano-particles in hexane solution to a fluid cell (vacuum chamber) with a ...
5
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0answers
58 views

Computational modeling of steric repulsion between two polymer mediated magnetic Nanoparticle?

Can you recommend any modern article or research papers on steric interactions and forces between two or multiple magnetic nanoparticles with polymer brushes in a nonpolar solvents? something with ...
0
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2answers
106 views

Is it possible to solve the equation for the diffusion of gas through a sphere analytically by applying e.g. "combination of variables"?

In the case of diffusion through a thin film it is possible to combine the variables in the following way: $\sigma = \frac{x}{\sqrt{4Dt}}$ where $x$=length $D$=diffusion coefficient $t$=time $\...
2
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1answer
75 views

Intensity of “surface plasmon resonance “ absorption peaks for a nano-rod

The SPR absorption spectrum of a nano-rod is seen to have two peaks with the longer wavelength peak corresponding to the absorption by the longitudinal plasmons and the other to the transverse ...