Fabrication - Science topic

Since I received the new orders of this nichrome wire sold by Phymep but fabricated by A-M Systems, it is totally impossible for me (and for others) to build the twisted electrodes as usual without them breaking all the time... Lateron, I learned that the reason was a change in their fabrication, and in particular the coating. Thus, I cannot use this new wire at all but need the same as before to build my electrodes. Would you know another company fabricating it ?

I'm welding (laser welding) a nitinol cylindrical tube to a nitinol flat surface, and I am evaluating three methods for the laser welding configuration (as depicted below):

I) using a groove on the surface for the tube before welding

II and IV) making a full cut-through in the surface for the tube insertion before welding.

III) direct welding of the tube to the surface

Which method would offer the best balance between durability (lower stress concentrations) and manufacturing feasibility? Insights into experiences with similar welding challenges or recommendations on materials and techniques would be greatly appreciated.

I have depicted the forces applied to the structure below (Fig. V).

Any method for DNA extraction from cotton fibre and fabrics.

Is it possible to generate drill files in CST for PCB fabrication? I know I can make gerber files there, but can't find any way to make drill file

The layup contains a biaxial non-crimp fabric (NCF) with orientations +45° and -45°. Would the correct notation be [(± 45)ncf ] , or should the fabric be noted like two separate unidirectional plies [+45/-45]?

Hello everyone,

I am trying to fabricate a homogeneous polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) thin film by spin coating. However, my spin-coated film is opaque and porous in the middle with many defects, and there are also some areas not covered by the film on the edge of the Si wafer.

I dissolved 12wt.% PVDF-TrFE powder into DMF. The solution was shaken in a mixer overnight until getting a transparent and homogeneous solution. Then, the solution was dropped on a clean Si wafer and spin-coated at 3000r/m for 60s.

Does anyone know how to get a transparent and homogeneous PVDF-TrFE film?

I have a project regarding lipid nanoparticles.

I faced a problem that I don't have the related apparatus for PDMS fabrication.

Is fabrication a necessary procedure before mixing lipid with oligonucleotide with microfluidic chip?

Is there any alternative ways to do fabrication in lab?

I have an automated design on CST Studio . I am trying to generate the Gerber file or DXF file. I am unable to finally get the file correctly. The error I am facing is attached.

We are working on the fabrication of Hall devices from exfoliated flakes of 2D materials. We are exfoliating these 2D materials on polymer stamps (PDMS) and then deterministically transferring them on pre-patterned Hall geometry devices(Ti/Au contacts 5/70nm respectively) on SiO2/Si substrate using 2D dry transfer setup. After the successful transfer of 2D flakes on device geometry, we inspect the devices microscopically (in high-resolution 100X). Optically the 2D flake appears to be in perfect physical contact with all contact leads. But when we are characterizing them electrically, in the first 2-3 sets of I-V measurements, we are getting the expected resistivity range and also the Ohmic nature of our contacts. But after 2-3 sets of measurements, the resistance of the sample reaches to giga-ohm range, and also, the contacts are losing their ohmic nature.

While inspecting the device optically after IV measurements, it appears in perfect working order (i.e. the flake is still in the same condition as it was before the measurements).

It would be a great help if you could suggest something regarding the issue based on thhe expertise in bottom contact devices.

Hello everyone,

I am using multilayer soft lithography to fabricate microfluidic devices. I am struggling to align the PDMS layers using a stereo microscope since both of the layers stick together and eventually do not move.

Is there a way to prevent them to stick with each other and align them eventually?

Hi all

I want to know what is colour strength and why it it importance to test it on materials/fabrics after being dyed. and what does it mean when the colour strength value/ percentage is high?

tha nk you

Hi,

We want to make a Self-Assembly of the probe to which -the SH bond is attached for the gold surface. We plan to make an annealing process to reduce residual stress of the 25 nm thick gold surface, which is coated by thermal evaporation. Can you give any advice on temperature?

Thank you for your help:)

Osman

Hello.

I am looking for a bicrystal fabrication company.

My major is focusing on the exploration of grain boundary structure.

And thus for a model experiment I need metal*or ceramic** bicrystals.

Could you let me know about possible companies which grow bicrystals for my research.

I would appreciate your reply.

Sincerely,

Bo

*Cu, Ni, Au, etc

**SrTiO3, BaTiO3, sapphire (Al2O3), etc.

I am trying to fabricate some silicon pillars with different radiuses on SOI exploiting an Ebeam lithography with 30KV. I already tried different photoresists including PMMA, Ma-N, and SU8 to make a pattern on SOI but yet it didn't work properly. The issue is that the pillars are so close to each other (periodicity 190nm) that the backscattering is affecting other adjacent parts and the result is not good enough for the next step which is RIE etching. I was wondering to ask the experts how can I manage to make these features on such a scale using a different fabrication approach or photoresist...

I would like to extend the study of electrochemical performance of the electrode material using two electrode setup and the literature describes the coin cell fabrication in a glovebox. If I am not using elements like lithium or sodium, should the assembling be done necessarily inside a glovebox or is there any alternative?

Would you kindly give me some requirements about fabricating core-shell fiber? Such as the requirements of the polymer solutions (miscible, immiscible?), the applied voltage, etc.?

Thank you.

I fabricated a supercapacitor which uses carbon as electrode material and found specific capacitance, cycle life, EIS studies, GCD curves, power and energy density.

Is it possible to simulate the same (fabricated electrode) using MATLAB Simulation.

Hello Researchers,

I am looking for some research work on the topic of ''Influence of laid scrim or grid on the Permeability of carbon Non crimped fabric (NFC) without Stitched.See the attached picture.

Mostly of the articles which I found was related to NCF stitched fabric.

I request if anyone working on it please share the knowledge.

Hello Everyone!

Greetings!

I am planning to work in the area of Synthesis of Polymer matrix composites for various Industry applications.

We have a dedicated Lab comprising 'Electrospinning Machine'. So any collaborations and constructive remarks are most welcome.

Thank you

Regards

Dr. Namdev Ashok Patil

#planning #work #research #electrospinning

When we fabricate a free-standing membrane sample, we would perform primary characterizations like FTIR, microscopic analysis, thickness, diffraction studies, thermal-mechanical analysis. Other than these I would like to know about some advanced techniques or experiments to examine the prepared membrane samples in general.

Thanks in advance.

I have metalic nanoparticle powders iwanna perform a cv electrichemical measurement i could not fabricate my working electrode using the powder please could anyone suggest to me ways and tips to prepare my working electrode. I'll be so thankful

Hello everyone,

I hope you all are doing good.

During UV soft molding I am facing the delamination of Photoresist in The UV soft mold.

Can anyone suggest the best releasing agent for photoresist for UV soft molding?

Thanks.

Have a good day.

Can someone please tell me which agencies in India fabricate microwave absorbers, typically transparent ones.

I hope you are doing well. I need your suggestion on PR stripping during UV soft mold imprinting directly from a silicon wafer. After making the silicon wafer mold by using the silicon wafer fabrication process.

I modified the surface with releasing agent.

Try to do UV soft imprinting directly from the silicon wafer mold.

But I am facing stripping of PR from the silicon wafer.

Could you suggest to me some method to overcome this issue?

I don’t want to use PDMS due to the shrinking issue.

Here is my method to make the silicon wafer.

📷Cleaning with piranha (H2SO4+H2O2).

📷Heating 110 0C for 3 minutes.

📷PR (AZ 10 XT).

📷Spin coating 2000~3000 rpm.

📷Bake 110 0C for 3 minutes.

📷Expose :300 mJ, 5mW/cm2for 60 sec.

📷Develop: (AZ 300 mif) 5~7 minutes.

📷Bake 150 0C oven for 5 minutes.

📷hard bake 110 deg for 6 hours.

📷Releasing agent dip for 20 minutes and dry for 24 hours under

📷Then did the UV imprinting.

📷Issue PR is stripping from the silicon wafer during soft molding.

Currently, liposomes are synthesized using lipid-coated beads. To make lipid-coated beads, lipid powder is initially dissolved in methanol containing rhamnose and glass beads. I am wondering about the function of the rhamnose, is it related to the coating ability of lipid on the beads?

We have tried to fabricated nano and micro structures together by using MR-I-8000 resist. However, we havent obtained any good patterns. After that, when we extracted microstrucutes from our design, nearly good resolution patterns were fabricated. In that time, thermal resist was not seen in some of the substrate. Therefore, ı need to some suggestion about thermal and UV Nil.

We have tried to fabricated nano and micro structures together by using MR-I-8000 resist. However, we havent obtained any good patterns. After that, when we extracted microstrucutes from our design, nearly good resolution patterns were fabricated. In that time, thermal resist was not seen in some of the substrate. Therefore, ı need to some suggestion about thermal and UV Nil.

Can someone help me know the program that I can use to draw the stages of manufacturing silicon solar cells.

I mean, is there any possible way to make polyester fabric as soft as cotton or like?

Can we make any masterbatch for this application if yes then what raw material will be involved in making of masterbatch?

Recently, we built up a new fuel cell station. But I cannot reproduce my old data for a while at other test station even use commercial one. I am not sure where is wrong.

I've tried some conditions and variables: MEA fabrication (including CCM, CCL, new ionomer, new catalyst, dispersion solvent ratio, spray-coating, hand-brushing...etc.) and test condition (anode/cathode flow rate, humidity, cell temperature...etc.), but still no production of current and power. OCV was normal (around 1-0.9 V).

So I started to consider about the test station, however, I am not familiar with this. Maybe is the cable(but VOM meter test no problem) or over connection(I need two terminals to connect cell because the types of electrode are different. I'm not sure this will have too much resistance that make current no produce or not).

And another question is, after cell test, CCL cannot stick on the AEM. Will there is the reason why make current produce? (but I used CCM still not produce current at all)

This bother me for a while. Can anyone help me? I will be really appreciate you.

We wanted to fabricate a perovskite solar cell using methylammonium lead iodide as the absorber material. But the popular HTL and ETL layers are very expensive and we can't afford those. Also, we don't have the facility to synthesize them too. Could somebody please suggest a few low-cost HTL and ETL materials that we can purchase to use with methylammonium lead iodide perovskite?

For making conductive fabric either we can print the fabric with conductive inks or we can simply use conductive yarns that have metallic or non metallic coatings. So which method is more useful and what are the advantages and disadvantages for both methods?

CFRP panel is fabricated and cure for 24 hours at atmospheric condition. now I want to know that, Is further curing can be done on hot air oven? and how we decide the temperature limit?

Hello,

I have unsuccessfully tried to determine ultraviolet protection factor (UPF) for fabric samples as described in standard EN 13758-1. To calculate UPF, I have measured absorbance spectra of the fabrics with a spectrophotometer with an integrating sphere, as told in the standard. However, my calculations produced way too low UPF values for each sample, including reference samples with known UPF. After double-checking the calculations and absorbance data with my professors, we noticed that at 290 - 340 nm even the most opaque samples did not exceed certain absorbance threshold. In fact, almost all my samples had some kind of an "absorbance plateau" there.

My questions:

1) What could have gone wrong with my measurements?

2) Is it common for the absorbance data to plateau like that?

3) Is the data unusable? If yes, how can I get correct absorbance data when doing re-measurements?

All the best and thank you for your answers.

Hi,

I tried to use SU-8 2150 to fabricate some micro structures (with a thickness of about 500um) with Mask Aligner. But I saw some white residue on top surface of the structure (see picture attached) after development. I used PGMEA to develop, followed by rinse with IPA. But no matter how long I developed, the white stuff was still there.

Does anyone have similar experience? What are the possible reasons for this?

Thanks!

Dear Researchers, Need to fabricate specimen from CNT powder using additive manufacturing technique and What could be suitable process for fabrication. Any vendors available for specimen preparation.

Thanks in advance

Metal matrix composites fabricated using stir casting is machined as per ASTM standards for tensile testing. Please suggest me the steps to give mirror finish for the specimen to conduct tensile test.

is immediately after cell fabrication the li ion goes to the carbon? and so when we carried out first cycle it is discharging (lithium goes back to anode). or in discharging lithium ions got inserted in to carbon anode.

What will the thickness of patch for fabricating CPW fed antenna.(substrate is FR4 Epoxy with thickness 1.6mm)?

Can you recommend a high resolution printer to fabricate plastic photo masks for lithography (esp. for SU8).

Please recommend a specific printer that's suitable for printing minimum feature size of 5 um.

Hello Folks, I have fabricated perovskite module of size 10*10cm2. Now I want to laminate this module? Can someone suggest how to do proper lamination of the module. If you can please refer the method, materials or reseach papers, it would be of great help. I have been looking for materials like meltonix (by Solaronix), encapsulation epoxy (Osilla) but not sure if we can use it? Please let me know If anyone can assist. Thanks

The type k has chromei wire,alumei wite n probably copper wire.It is the most available thermocouple probably.

I have to fabricate a 2D Hot electron transistor for my project.

I come mainly from a theoretical physics background. So I don't know what to search or read to know about what parameters affect the frequency of a 2D heterostructure Transistor. Can someone help me out by pointing the literature I should really be looking for?

I am fabricating the screen printed carbon electrodes with Ag/AgCl reference electrode, carbon working and carbon counter electrodes. How can I validate its parameters and functioning? Is there any defined set of standards regarding electrical conductivity and resistance? How shall I carry out the electrochemical characterization?

Also recommend which fabric to use for better results in evaporation?

the types of the electrodes in Cyclic voltammetry according to what I can choose it

and

if you are fabricating a counter electrode (cathode ) in PV cell and anode

Are they the same in CV, if they are the same which one is the working electrode and counter electrode

As we know, heteroepitaxy is an interesting topic in the field of semiconductor material fabrication by CVD method. For diamond heteroepitaxy on Ir substrate, we know no related results about heteroepitaxial nucleation are reported without the bias enhanced stage. It means some specific method is needs though the diamond heteroepitaxy on Ir substrate is possible from a theoretical point of view. So what factor decides whether one material can be heteroepitaxially grown on a substrate?

how we can synthesize control growth of the vertically aligned ZnO nanostructures on the carbon fiber surface in a outward direction?

We are going to fabricate silicon based anode materials on copper foil. We are targeting to enhance cyclic stability of anode as a result of Li ion insertion. In literature, mostly it has been done after coin cell fabrication. Is it possible to test that without coin cell fabrication in electrochemical work station by EIS and CV? If yes, then what should be complete electrode assembly? We are looking to use LiOH solution as an electrolyte, sample deposited copper foil as working electrode and Ag/AgCl as reference electrode. Will it work? Any suggestion or recommend from literature will be appreciated.

Hello all colleagues,

I have a simple question that I am finding the Grams spectroscopy software (with full approach) for 3D fabrication. I am not able to find any version for personal usage. If you have information how to search for it or if you have the software to share with me , please let me know. I will contact via email as well.

Thank you and Most sincerely,

Hi,

I am simulating a NFC antenna (planar coil inductor) on a polyimide substrate in HFSS and comparing the input impedance/smith chart of the simulation with the fabricated sample. I checked the inductor value at 13.6 MHz which is a good match between the physical sample and simulation. However, for the physical sample smith chart measurement, I am getting open point at 45 MHz frequency whereas in the simulation it is 66.3 MHz. I have attached the picture of both simulation and actual measurement. I want to match my simulation with the physical measurement.

In the simulation what might cause this difference in open point frequency shift, anybody can suggest?

we want to fabricate Schottky barrier-based Source and Drain in MOSFET without ion implantation and Diffusion because of lack of facilities. For our device, Channel width and length are not a concern, we want to fabricate Simple high channel length devices.

can anyone suggest to me the process flow and any good paper for fabricating simple SBMOSFET?

Looking for Graphite whose particle size is less than 1 micro meter in India.

I am working on composites for FDM, my work requires mixing of additives and filament fabrication.

I want to fabricate CuSe thin film by... solution method

a brief review about properties and charactertics of blended fabrics of 20%wool/80%nylon

The cantilever is trapezoidal shaped with non uniform substrate thickness. Piezoelectric layer, and electrode layers are uniform. I want to learn the the possible fabrication steps such kind of cantilever.

I am working in perovskite photovoltaic lab. We are fabricating carbon based monolithic perovskite solar cell. The structure of our cell is FTO/c-TiO2/m-TiO2/ZrO2/C and perovskite infiltration. We have fabricated the solar but we are not getting ideal IV curve which also results in low efficiency. How to improve the fill factor and get better IV curve?

I fabricated a composite membrane using PSF and PEG with DMF.

What are the challenges in using glass substrate for microstrip fabrication? Do industries really use them?

Hello,

I am planning to coat membrane casting solution onto a supporting material. However, it is quite difficult to find a suitable membrane support material. Most of vendors sell nonwoven support materials in buck, more than 200 yards, which is quite expensive.

Can anyone recommend any vendor who sells nonwoven fabrics for ultrafiltration membrane support in lab scales?

Many Thanks!

What will be the future of solar cells? Perovskite solar cells? OR III-V Solar cells ??

1. Perovskite solar : Easier to fabricate (can be printed like paper) and have low conversion efficiency but might include toxic materials.

2. III-V solar cell: Difficult to fabricate, however, it can provide higher efficiency (47.1%, 2020).

I'd like to fabricate by lithography multilayer metasurfaces in the visible. Which kind of high transparent polymers or something else can you suggest me ? For example I tried with OrmoClear FX but NMP damages the polymer with the second layer.

Share novel interlacement of woven fabric and how the effect interlacement pattern on mechanical properties of the fabric.

Is it possible to fabricate perovskite (AgNbO₃, BaTiO₃ etc.) thin-film via the RF/DC sputtering method with the help of pure metal precursors such as Silver and Niobium in the presence of an Oxigen (O₂) environment?

If anyone has tried,

If anyone has experience with another perovskite thin film, please share your experience.

Dear scholars,

I am wondering to know which type of cellulose nanocrystals (CNC) can yield epoxy nanocomposites with superior optical properties, particularly transparency. In other words, is there any difference between the transparency of nanocomposites fabricated by cellulose I or cellulose II.

I would be grateful if you could please suggest decent references regarding the feature of nanofillers that affect the transparency of composites.

I use indium mounts to hold my sample on an 2-inch holder, now I want to remove the indium on the backside of my sample since I want to fabricate a MOSCAP, can somebody tell me what can I do?

I am fabricating activated carbon from biowaste like peanut shell for supercapacitor applications. Literature shows that all calcination are doing under inert atmosphere and not normal calcination. We dont have facility to do calcination under inert atmosphere. Will it affects the result if I go for calcination without providing inert atmosphere

I am fabricating a optical micro ring resonator where the width of the main waveguide and ring wave guide is 1 um. I am wondering what should be (optimum) height of the waveguides so that it supports a single mode with maximum confinement.

Thanks.

I need a High Precision Printer that can print photolithography Mask in Transparency at 10um range. I know Inkjet printers does better in this case but I need a specific Model that people used for this kind of thing. It would be really helpful for me if can suggest me the model number.

Hi,

I am working on the design and modeling of micro heat pipes. Then, I am going to fabricate some samples and experimentally validate the obtained results. Is there any research center or company in Europe where can I use their setups or order them to fill the customized heat pipes? I would appreciate it if you mention some places.

Best regards,

Respected Researchers,

I want to fabricate the rods from Hydroxyapatite ( HAP) nano powder. I want to develop these rods for the coating purpose by thermal spray process.

1. Can opt the thermal spray method for the development of coating with this powder?

2. Please suggest the good literature and method for the fabrication of the rods of dia 6.67mm length 300mm.

I am waiting for the positive response

I want to fabricate a floating gate FET for biosensing but I could not understand about width, length size for Drain, Source and Channel. I want to make a well up on channel for electrolyte and analyte housing by PDMS and want to use gate as floating in the electrolyte. Would you please help me about this?

As we know, it is a very difficult task to differentiate tsunami deposits from storm deposits. Sedimentological (grain size, grain sorting, sedimentary structure and sedimentary fabric), palaeontological, geochemistry and geophysical analysis are the most common methods to identify and characterise the tsunami deposits. Recently, X-ray computed tomography is being used in grain size, sedimentary structures and fabric analysis. Can we consider X-ray computed tomography as a unique tool that could discriminate between storm and tsunami deposits?

I see a similar issues encountered by other. Can anyone help answering. Thank you.

My hyperledger fabric network consists of 1 orderer, 1 organization and 3 peers. I tampered ledger of first peer and then tried to do another transaction on the same peer, then the following error was thrown:

"Error: deliver completed with status (SERVICE_UNAVAILABLE) before txid received - proposal response: "

But the transaction was executed and also the block was added in tampered ledger of peer. But the tampered data was not restored to previous state.

With the reference of the answer in this link - "https://intellipaat.com/community/17752/in-hyperledger-fabric-blocks-locations-and-validity-criteria", I came to know that if the tampering is done, "the state database can be dropped and rebuilt from the blockchain".

So this process of dropping and rebuilding the database is done automatically by peer or we need to do it manually?

In short, if tampering is done in ledger of peer, how can be the previous state of ledger restored?