Science topic
Adhesion - Science topic
Explore the latest questions and answers in Adhesion, and find Adhesion experts.
Questions related to Adhesion
Hi everyone,
I am a 2nd year medical student interested in conducting a retrospective cohort study to identify modifiable pre- and post-operative risk factors (patient-related and practice related) for adhesion formation in patients who undergo abdominal surgery.
I have an interest in general surgery and would love to collaborate with other students, residents, attending, faculty etc. interested in or practicing in this field. I am trying to find a collaborator with access to the ACS NSQIP database, so if you or someone you know work at a participating institution and would like to collaborate, lets get in touch!
I am also open to advice or recommendations for how to narrow the scope of this research idea to maximize clinical impact and/or feasibility of the analysis.
Thank you!
Glass substrate is cleaned with acetone, IPA and ozone treated, still facing adhesion issues.
Hello, I'd like to know whether MC3T3-E1 type pre-osteoblastic cells can adhere to wooden surfaces, more specifically Douglas-fir and poplar sapwood.
As part of my project on the Role of material porosity on osteoblast cell adhesion, we're wondering about the compatibility of these substrates for cell culture, and would like to know if you've already observed or experimented with this type of adhesion, or if you could point us in the direction of suitable protocols.
Any information or suggestions you may have would be greatly appreciated.
Thank you in advance for your help and expertise.
I have prepared rGO/In₂O₃ composite thin films using a paste formulation of ethyl cellulose and α-terpineol. The films were spin-coated onto a glass substrate, followed by an initial heating step on a hot plate at 350°C. This process was repeated for multiple layers to achieve the desired thickness. After deposition, the films were annealed at 350°C for 3 hours on a hot plate to remove the binder and improve adhesion.
However, I am experiencing a film peeling issue, where the coated layers detach from the glass substrate after annealing. I would like to understand the possible reasons behind this problem and how to improve film adhesion.
Potential factors I am considering:
- Thermal Stress & Rapid Solvent Evaporation – Could the direct hot plate heating at 350°C cause rapid drying, leading to stress-induced delamination?
- Incomplete Binder Burn-Off – Is 350°C for 3 hours sufficient for complete ethyl cellulose removal, or would a higher temperature and longer duration be required?
- Surface Adhesion Issues – I have already performed ozone treatment on the glass substrate, but are there additional surface treatments (e.g., plasma treatment, adhesion promoters) that could enhance adhesion?
- Layer Thickness & Spin Coating Parameters – Could multiple thick layers contribute to internal stress? Would increasing the spin speed (e.g., 4000–5000 rpm) or applying thinner layers improve adhesion?
- Glass Substrate Limitations – Since I am using soda-lime glass, could the substrate itself be a factor in poor adhesion due to thermal expansion mismatch?
I would appreciate any insights or recommendations on how to prevent film peeling and improve the stability of the rGO/In₂O₃ thin films.
We are considering purchasing an inverted microscope primarily for routine monitoring of adherent cell cultures (e.g., assessing adhesion, confluency, and morphology).
During our search, we found a cost-effective inverted metallography microscope designed for reflected light imaging. Given that cell culture observation usually relies on transmitted light techniques, would reflected light microscopy provide sufficient contrast and resolution to evaluate cell adhesion and confluency? Are there specific limitations or adjustments that could make this feasible?
We appreciate insights from anyone with experience adapting metallography microscopes for biological applications or knowledge of reflected light limitations in cell imaging :)
#microscopy #cell-culture #metallography #imaging
I am looking for information on the use of the pull-off strength method (ASTM 4541) for testing metallic coatings on metals and plastics by car manufacturers. Perhaps you know of documents, references, articles, etc. that are used by car manufacturers (you can just name them)
Hello,
I am trying to find the best treatment for microscope slides to promote the adhesion of cartilage and bone sections. Ideally I would like to find a way to treat common microscope slides and Ibidi chambers (glass bottom), but I am happy with either one.
I tried to use superfrost positive slides (failure) and poly-lysine coating (failure). I will try to use silane-prep slides, but in the meantime I wanted to make sure there is no other (or better) way.
Any suggestion is welcome!
Thank you.
Best,
Giulia
Introduction
In complete edentulous patients, particularly those who have recently undergone extractions, significant differences in the anatomical and biomechanical properties of the maxilla and mandible influence denture design. The mandibular mucosa is thinner, more fragile, and less resilient compared to the maxilla. Additionally, mandibular bone has reduced vascularity, higher density, and increased susceptibility to resorption under pressure. This creates unique challenges in mandibular denture fabrication, particularly in maintaining stability and reducing tissue trauma.
The incorporation of soft liners as an interface material in dentures has been proposed to mitigate these challenges by redistributing forces, reducing pressure points, and enhancing patient comfort. This discussion explores the advantages, limitations, and future potential of soft liners in mandibular dentures.
---
Anatomical and Biomechanical Considerations
1. Mandibular Challenges:
The mandibular ridge is more prone to resorption under pressure due to its dense structure and limited vascularity.
Areas such as the labial and distolingual regions are particularly sensitive to pressure, often requiring modification of the denture base, which may compromise seal and retention.
2. Maxillary Advantages:
In contrast, the maxilla often benefits from undercuts that contribute to retention without causing significant discomfort. The mucosal properties also enhance the seal and support of the denture.
---
Soft Liners: Properties and Applications
Soft liners are categorized into two main types: acrylic-based and silicone-based, each with distinct properties and limitations.
1. Acrylic-Based Soft Liners:
Derived from poly(methyl methacrylate) (PMMA) with added plasticizers.
Advantages:
Good adhesion to the acrylic denture base.
Effective in temporary applications.
Limitations:
Plasticizers leach out over time, leading to hardening, porosity, and bacterial colonization.
Short lifespan and odor development due to fluid absorption.
2. Silicone-Based Soft Liners:
Composed of dense, non-porous silicone materials.
Advantages:
Superior durability and elasticity.
Capable of distributing forces evenly with moderate thickness.
Resists hardening over time.
Limitations:
Poor adhesion to the acrylic base, leading to potential microleakage.
Microorganism accumulation in the interface.
---
Challenges in Silicone Liner Integration
The primary obstacle in utilizing silicone liners effectively is achieving strong, long-lasting adhesion to the denture base. The hydrophobic and dense nature of silicone resists chemical bonding with PMMA. This results in:
Separation of the liner from the base.
Microbial infiltration at the interface.
---
Potential Solutions
1. Adhesive Primers:
Application of specialized primers can enhance chemical bonding between silicone and acrylic, improving liner retention.
2. Hybrid Materials:
Development of hybrid soft liner materials combining silicone flexibility with acrylic adhesion properties.
3. Advanced Fabrication Techniques:
Utilization of 3D printing technologies to create custom-designed dentures with integrated liner materials, ensuring uniform thickness and precision.
4. Antimicrobial Modifications:
Incorporating antimicrobial agents (e.g., silver nanoparticles) in silicone liners to reduce bacterial growth at the interface.
5. Localized Application:
Partial application of soft liners in high-pressure areas (e.g., labial and distolingual) to balance flexibility and retention.
---
Clinical Recommendations
1. Pre-Denture Tissue Conditioning:
Employ soft tissue conditioning techniques to prepare the mandibular ridge before denture fabrication.
2. Trial Use of Temporary Liners:
Use temporary soft liners to assess patient tolerance and make necessary adjustments before final fabrication.
3. Combination of Rigid and Flexible Materials:
Design dentures that combine rigid bases with flexible liners for optimized performance in specific regions.
---
Conclusion
Soft liners represent a valuable tool in addressing the unique challenges of mandibular denture fabrication. Acrylic-based liners are suitable for short-term applications, while silicone liners offer long-term benefits if issues with adhesion and microbial infiltration are resolved. Advances in material science, such as hybrid formulations, and manufacturing techniques like 3D printing, have the potential to establish soft liners as an integral component of modern denture prosthetics.
Further research is needed to optimize the integration of soft liners in mandibular dentures and address existing challenges, particularly in adhesion and microbial resistance.
---
Keywords
Soft liners
Acrylic-based liners
Silicone-based liners
Mandibular dentures
Tissue conditioning
Denture retention
Prosthetic materials
---
This discussion is prepared to foster academic exchange on ResearchGate, encouraging collaboration on material innovations and clinical applications in denture prosthetics.
Hello dear professors: Please advise on the materials used in acidic, neutral and alkaline antiscalants and also how to prevent the adhesion of polyacrylic in antiscalants to the membrane surface in water containing iron.
Thank you.
I am working on a dental adhesive (bonding) and want to know which one of my samples is better. I am not talking about shear or bending or tensile strength. I just want to know what the characterization method is for dentists to know that the dental adhesive reaches the adhesion qualification before applying restoration.
Thanks
My goal is to use the spin coating technique to deposit a thin film of a material dispersed in an NMP-based solvent on a glass slide. As the solvent is very slippery, its adhesion is very poor over the slide and I am unable to deposit it. How can it be improved?
Hello everyone,
I want to know how to find about DC2.4 cell's information,
like 'is it adhesion or suspension?' and 'DC2.4 cell' s doubling time?'
but I can't found those information in internet,
some paper only say how to culture.
I really want to know.
Thanks!!
For hydrogel coating materials, how can the mechanical properties and adhesion to substrates be effectively improved?
Does adhesion energy work better for polymers and oligomers?
the adhesion for sub nano(below 5 nm ) Pt deposition by PVD is challenge or not?
How can I determine a good adhesion strength range for coatings on polymer surfaces, such as DLC on polymer substrates? Is there a specific threshold for adhesion strength (from T-peel tests) above which it is considered adequate, particularly when the coating needs to function as part of a frictional pair?
I aim to be as skeptical as possible regarding whether a pair of orthologous genes results in the same phenotype in their different but related bacterial organisms under similar environmental conditions.
"Methodology ..... To determine whether type IV pili play a role in bacterial host-cell adhesion, we measured the ability of wild type A. nosocomialis M2 and mutants with altered type IV pili biogenesis phenotypes to bind to immortalized lung (A549) and nasopharyngeal (Detroit 562) epithelial cells in vitro."
"Introduction ..... We demonstrate that Acinetobacter type IV pili promote host-cell adhesion in a manner independent of C-terminal glycosylation."
"Abstract ..... examine the consequences of this heterogeneity for protein folding and assembly as well as host-cell adhesion by Acinetobacter."
Maybe there is something in the details that makes a working interpolation possible.
If the pairs are similar, will it reduce the adhesion due to electric charges?
The shell material is melamine formaldehyde and polyurethane, polyurethane-urea fragrance capsules are produced and the laundry is washed with softeners. However, the fragrance capsules do not bind to the fabric sufficiently. What should be done for this?
- i try to simulate a peeling process, however once i particiant the cohesive slave surface or other try......
- the simulation will show us near not adhesion between adhesive and adherend?
- the msg file told me there are 2 region that are not connected but i ckeck my boundary condition, it dose not have any problem?
anyone meet the same problem?
thank you
I submitted my journal and got some comments, I have answered and corrected all the comments from the reviewer but I don't understand how to answer this question.
any expert researcher help me to explain what I have to do and how?
What can the authors say about the interface problem between the concrete core and the CFRP shells? What is the adhesion type like? How can core-shell bonding affect performance?
I had deposited Ni (350nm) and Cr (100nm) on a Si-SiO2 wafer. But when I stripped the photoresist (LOR 3B as first layer, and then S1818) the devices were destroyed. I guess this is because of poor adhesion. But in some articles I have read that Ni and Cr are good adhesion materials on SiO2. Can anyone justify that?
I have tried combination of few monomers and resulting emulsion shows tack but tack is not enough to be measured by lap shear test machine, should I try new combinations or use some other method to check adhesion? by changing ratios of monomers viscosity is getting higher with formation of lumps
FeCrAlloy® foils are commonly used for fabricating metallic monoliths. However, their lack of specific surface area/roughness (pores) hinders catalyst adhesion during the coating process. Several pre-treatment processes have been investigated in recent years. Is it possible to exploit the high porosity of MOFs as a primer, thereby enhancing catalyst adhesion on these monoliths for the development of more stable structured catalysts?
I have been searching for experimental data on the sticking coefficients of atomic neutral hydrogen on copper surfaces as a function of the initial kinetic energy of the beam, but I have only found data for one value of the initial kinetic energy.
If anyone knows of any sources where I can find this type of experimental data, it would be greatly appreciated.
Thank you.
I'm trying to achieve bonding between two different substrates through thermocompression using indium as an adhesion layer. After depositing indium through e-beam evaporation, the thin film is white and not metallic like the pellets. Is this common or an issue?
How the adhesion of thick SU8 to copper seed layer can be improved ?
And which SU8 resist would you recommend for MEMS ?
Thank you.
quick summary: I am looking for a way to slow down lift-off (1165 or acetone) for a given material system (changing materials to solve the problem is not possible)
This is a relatively general question. I have a given material system which presents low adhesion between semiconductor and metal (But imparts certain desirable properties). Lift-off is then not impossible but is completely done in under 5 minute and invariably leads to undesired loss of deposited metal. I would like to slow the process down (mainly for convenience and reproducibility). I am going to try IPA dilutions and active cooling as 2 approaches.
Has anyone ever tried these or other methods to slow down lift-off ?
dear friends
I was playing with some theory of friction in viscoelastic solids, perhaps you can help me finding if there is any research on friction at negative loads (therefore under adhesive forces) for viscoelastic materials, for which friction is due to the difference between work of adhesion at trailing and leading edges. There are some few papers in the literature (see below) on friction at negative loads, as after all the classical Bowden Tabor model or the Derjaguin model of friction do predict a normal load independent constant value of friction Ft=Ft0 + mu N, so this is nothing surprising. However, actual models for this are mostly in metals or due to triboattraction, not in viscoelastic materials. Any suggestions in general?
Regards
Mike
Skinner, J., & Gane, N. (1972). Sliding friction under a negative load. Journal of Physics D: Applied Physics, 5(11), 2087.
Brezoczky, B., & Seki, H. (1990). Triboattraction: friction under negative load. Langmuir, 6(6), 1141-1145.
Common acrylic adhesive, such as two part acrylic adhesive, can bond two metal material very tightly, but can not bond two plastics. Is there any solution to improve the adhesion ability between two plastics?
Is there any adhesion cells with potential cance therapy?
I mean working on shape and size without changing materials. The goas is to reduce joint and adhesion failures.
Hi everyone
im trying to evaporate gold with electron beam evaporation. but haven't shown any adhesion.
i have used microscope slides as well as Titanium as a adhesion layer but there haven't seen any adhesion between titanium and gold.
can any body help me?
I have seen polyimides being used as a binder for lithium-ion battery electrodes. I wonder if all types of polyimides exhibit adhesion properties? What chemistry of polyimides makes it a binder?
we have done a PCR for adhesion molecules comparing lung tissue from healthy mice to inflamed mice. surprisingly, the RNA expression in the inflamed mice is much lower than the healthy ones. I don't know how to interpret this, we are ruling out technical problems. Has anyone seen this before?
Produced wax emulsion is mixed with acrylic binder for hydrophobic coating of papers or fabrics with good adhesion.
I need some useful empirical information on the formulations of raw materials and procedures.
Soobok Cho
I have platelet pellet in PBS in my lab, but I am not sure how to proceed with platelet adhesion assay using platelet pellet with minimal amount of PBS. Most of the protocol show platelet adhesion assay using fresh human platelet rich plasma (PRP) instead.
When I culture Candida albicans biofilm in 48-wells plate for one day, some floating pieces could be observed in the liquid-air interface. Is it the broken biofilm?
My biofilm culture procedure: After initial adhesion for 90 min, unattached Candida albicans cells were removed and the 48-wells plate was washed by PBS. After PBS removal, the culture media is added. And the plate is settled in incubator with shaking rate of 180 rpm.
How can test the adhesion of CE in DSSC using scratch test?
Hi Sirs,
How can rate the adhesion strength of thin film after scratch hatch test (tape test) by accurate method ?
I know That the tested area is examined with Magnification glass and adhesion strength is rated according to the amount and removed coating but what the accurate ways??
thanks
In these diagrams, how to convert the numbers obtained from the tensile test to units?
I intend to use Tetra deacyl acrylate with methacrylate for adhesion with human skin operated by human's body temperature. Therefore, Please suggest an alternative of this acrylate. Thank you.
Recently we have fabricated a biobased nanocomposite films from PLA/CNC by effective blending then solution casting method followed by EIPS. But for a perticular composite it has clerly been found a large agglomeration additionally poor adhesion during compounding indeed whereas it exhibited less thermal stability & lower crystalinity index. But i am not sure about the actual reason behind the sence but suspect that the large agglomeration & poor adhesion is guilty for it, is it?
What do you think about it?
It is well-known that 2D materials are used to improve tribological properties either as solid lubricants or as lubricant additives. Few layers of 2D materials are known to provide reduced friction than monolayers because of the easy shearing between the layers due to the presence of van der Waals forces. However, monolayers also reduce friction, so is it due to the chemistry, inertness, and atomic level smoothness of monolayers or lower adhesion between the two contacting surfaces, or something else? Please enlighten me with your thoughts.
How to design an experiment to see if an adhesive molecule can form a homodimer to mediate cell-cell adhesion? From other molecule binding modes, the interactions can be divided into homophilically and heterophilically trans-interact or cis-interact. How to clarify?
Hi everyone, I want to simulate bacterial adhesion by COMSOL.
Can anyone suggest how can it be possible
Dear friends!
Which thermoplastic polymer exhibits the best adhesion to aluminum?
Thank you
I have observed opposite response from gram negative and gram positive bacterial cells on plasma modified polymeric surface in terms of adhesion and biofilm formation.
gram negative cells show above 90% reduction in adhesion and gram positive show only 9% reduction. What could be the reason behind this?
Which property of bacterial cell type might be playing a role?
Please explain.
Thanks in advance.
Hello,
I am having trouble sputter coating Mg on glass substrate. The adhesion is terrible during lift-off and I lose significant yield. I tested the same process with a silicon wafer, and the results were extraordinary but terrible with glass.
I know I can use an adhesion layer like titanium, but at this stage, I want pure magnesium structures.
Is there anyone with experience regarding this problem?
We don't have HMDS vapor priming, unfortunately.
Is there any other Ebeam resist adhesion promoter that can be used by spin-coating onto the substrate?
I want to perform coating of PMMA-ceramic composite on metallic substrate. but the coating gets detached after it is completely dry. can I add any adhesive to get proper adhesion? kindly suggest?
In order to synthesize mesoporous polydopamine nanoparticles, F127 and trimethylbenzene were used as organic templates. Then the nanoparticles were centrifuged and washed ultrasonic three times with a mixture of ethanol-acetone for 30min each time, and finally suspended in water. However, the TEM images showed large coral-like adhesion, and the boundary and morphology of the particles were not clear. Is there any solution?So kindlly help.
Hello I am doing primary pulp cell culture and I get them from the mechanical method. better known as the overgrowth method. the problem has been two: adhesion and another is that even if there is adhesion in one well or another there is no proliferation of cells.
another issue is the enzymatic method that we do with collagenase type I and it goes straight to the T25 flask, but the cells are not adhering to the bottom of the bottle. Any suggestion?
How to Place Carbon fibre as a factsheet over PLA 3D printed Honeycomb Structure?
What are all the adhesives used to bind both facesheet and PLA core?
I am radiolabeling silica nanoparticles with a certain radioistope, however after purification I found that the activity was still in the eppendorfs, means that my particles get stuck to the tubes, although I am using low adhesion eppendorfs.
So what is the best way to prevent adhesion ? coating with hydrophilic polymers to polysterens ? and how to do so ?
I have used dopamine hydrochloride solution: 2g/L of 10 mM Tris-HCL (pH=8.5) buffer for dip coating certain surfaces such as PDMS for around 24 hours while stirring slowly. The solution changes color to dark brown signifying the oxidation of catechols and the AFM scan shows the formation of a thin layer on ODMS film. The problem is I am getting zero adhesion in the dry state as well underwater. I do not understand what I am missing and why the surface is not sticky at all. I followed a couple of papers and the following is one of them. Can anybody please help me out in this regard?
H. Lee et al. Mussel-inspired surface chemistry for multifunctional coatings. Science 318, 426–430 (2007)
I want to stick a PTFE membrane onto a piece of Al foil. I have Ag paste and I think it is a good conductive adhesion. How can I distribute the paste uniformly on the membrane and stick it firmly onto the Al foil? My lab also has a spin coater and some ovens. Thank you.
Hello,
i know that the 2 tests test how good is the adhesion. So what is the difference between these 2 tests?
best regards
Mokhtar
Can any body let me know some good adhesion promoters for Butyl rubber sealants.
Currenty we are using c5 resins and PIB but not very useful.
Thanks in Advance
Dinesh Gupta
Hi All, I need your help. Im working on one project and i would like to enhance the attachment of one organism (streptococcus) to solid surface. Can any one help me on that? Some they told me only conventional organisms that easy to bioengineer can be done, but streptococcus is very difficult.
Thanks
Has anyone experience with growing Caco-2 cells on poly-l-lysine coated surfaces? What concentration of poly-l-lysine works best? What other matrices work best for Caco-2?
Hi!
I am looking for a summary/review of overall different integrin isoforms' affinity to different ECM ligand isoforms。 eg. integrin a7b1 has high affinity to Laminin a2, while a3b1 and a6b1 has high affinity to Laminin a5. Not just laminin but also different collagen. I have came across some papers but there should have been some previously done review.
Thank you!
We seed the BM-MSCs with 10% exosome-depleted FBS (Gibco) in culture and we couldn't see adherent cells after 24h. Should we wait for 48h or should we discharge all the flasks? If you give a response back, we will be grateful.
I transferred KB cells stored in -80 into a T-75 flask by adding 10% FBS media without centrifugation.
I plan to change the media after proper adhesion of the cells. I don't know how many days it will take the cells to adhere and when to subculture it. Please let me know how many days it would take those cells to be revived. And also when to subculture it
Hello,
i am making researches about what can affect (or what could improve) the adhesion of CAR
if any one have articles for this topic, please let me know. Thank you very much!!
best regards
chiko
Hello,
when we expose a photoresist with a mask that has big and small structures, which structures will have a better adhesion on the wafer? and why (how can we explaine that in the physic)?
thank you very much!!
best regards
Mokhtar
Hello,
i did a nanoindentation test on 2 photoresists. The results show that the 2 FR have the same hardness but there are a big difference on mudulus between them.
can please some one explaine to me how can we explain that in the physic?
and what is the difference between hardness and modulus of polymers?
thank you very much!!
Mokhtar
Hello,
i would like to now please if ther is a book that talk about hardness/modulus or adhesion of polymers?
thank you very much!!
best regards
Chiko
I want to reduce the adhesion between the sand and the cast iron despite not reducing the adhesion of the sand together, what materials can I use?
Hello friends,
I want to coat on aluminum alloy, but before I do the coating, I will do the zincating process to activate the aluminum and to ensure the adhesion of the product to the surface. In the research I have done, they briefly talk about the process of Zincate. How is this process done and which chemicals are preferred?
Thank you for helping.
What is the lowest known detection limit of microplate testing for identifying antifouling agents?
See : "A marine bacterial adhesion microplate test using the fluorescent DAPI dye: a new method to screen antifouling agents" C. Leroy et al. Letters in Applied Microbiology ISSN 0266-8254
Our method allows the quantification of adhered marine bacteria in well from about 2 · 107to 2 · 108 bacteria per cm2
Thanks in advance
Hi all, I am depositing thin films onto quartz glass substrates, but due to supply problems the only adhesion metal available to me is chromium. My 2nd layer is silver to provide good conduction. Does anyone have experience with chromium-silver films? Does silver adhere well to chromium?
Done the usual googling and came up with nothing - maybe I'm not googling correctly.
Thanks in advance,
Nick
Previous test showed that polypropylene fiber has poor adhesion to epoxy resin. Consequently, the mechanical properties of reinforced resin are reduced. From some literatures, the reason for poor bond properties is that the surface of polypropylene fibers lacks active groups. I know that both the polypropylene fiber and epoxy resin are hydrophobic. I have a question. How to improve the bond between polypropylene fiber and epoxy resin, and related mechanisms.
I need to open and elaborate a force-distance curve measurement file with Gwyddion.
How can I normalize the raw data, apply a model (e.g. Hertz) and get mechanical info of the material behavior (elastic modulus and adhesion force)?
Dear Colleagues,
I have been performing the adhesion studies for my polymeric patches in the TA.XT plus texture analyser instrument.
The unit displayed for the adhesion force is in newton (N) or kilogram (Kg). I need to convert the newton unit to a pascal or kilopascal unit. Can anyone let me know the mathematical conversion for this?
Kindly suggest.
I am trying to culture primary microglia cells from adult mice but for some reason I am getting really small cells and not seeing the typical morphology of microglia cells. Even when cells are put in MCSF media and left for a couple days I am not seeing any change in their morphology or any adhesion to the plate. Could someone please let me know if there is something I can do to get better results?
How can the adhesion between the Teflon coating and the base material be enhanced? In particular, the working environment has heating conditions.
Hello,
Au does not form a good metal-oxide interface, we obviously need to insert an adhesion metal layer (Cr, Ti, etc) to make a good bonding with the substrate. I was wondering if there is any way to improve the adhesion between gold and a transition metal oxide film (SrTiO3 thin film) without an extra adhesion layer. Would thermal annealing be helpful? Or plasma cleaning of SrTiO3 surface right before Au deposition? I use electron beam evaporator for Au deposition (~30nm).
I would greatly appreciate any suggestion!
Hello, I've met a problem trying to simulate a transient impact case with the ‘Solid Mechanics Module’ in COMSOL.
In this case, there are two blocks which are formed assembly. And the contact surfaces are defined as contact pairs.
‘Penalty, Dynamic’ is selected as the contact method. And the ‘Adhesion’ and ‘Decohesion’ are also defined. Fixed constraint is applied to the bottom surface. And a transient total force changing with time is applied to the top surface. A Time-dependent study is conducted and the time is (0, 1e-6, 3e-5) [s].
However, when I submit the calculation, the error occurs. which said that "failed to evaluate Jacobian"
I attached pictures with comsol configurations.
anyway thanks for your kindly help!
I attached the file, which is COMSOL 5.6 version
Dear researchers,
I am working on Mg composites fabricated by powder metallurgy. I have investigated the wear behavior of Mg-based composites with variation in temperature. I observed that wear rate increased with an increase in the wear temperature. Can anyone explain me in detail, why is it happening? What is the mechanism? I am looking for your responses.
Thank you so much.
I am using Eco flex as a dielectric material for my flexible capacitive pressure sensor. To fabricate the second layer of my capacitive electrodes I need the plasma treatment on the surface of Eco Flex.
Dear community,
does anyone have suggestions on papers which adress the influence of surface chemistry (which is e. g. altered by surface treatments) on adhesion of different adhesive types?
I would especially interested in research on polymeric substrates but also metallic ones (especially aluminum).
Other influencing factors (e. g. topography, roughness, crystallinity) would also be interesting.
Thank you all!
I was trying to adhere PU (60A) with UHMWPE. For that, I PU liquid mixture (part A and B, purchased from Mcmaster carr, link: https://www.mcmaster.com/8644K24) on
Then I put 75 D machined part in a container and then poured 60A liquid around. Then I let it form over 12 hours. Then I baked at 120F for another 10 hours to cure.
Unfortunately, I noticed that the UHMWPE parts can be easily peeled off from the PU as can be seen from attached figure.
In contrast, I did same thing for PU-60D (instead of UHMWPE) and found good adhesion between PU 60A and PU60D.
Literature suggest that surface treatment of UHMWPE (surface roughening or corona or plasma treatment) may induce good adhesion.
Any insight on adhesion between UHMWPE with PU 60A will be appreciable
In DSSC or any other PV solar cell
the counter electrode put on FTO
how we can measure adhesion strength between CE and FTO by AFM
thanks
I want Friction pile group efficiency data and I am unable to find anything about it. I want cohesion number of pile adhesion factor etc.?
How to measure the adhesion of an anodized layer to an Mg alloy?
I am grinding active material, acetylene black and PVDF before adding NMP to the mixture. What should be the weight ratios of PVDF and NMP so that the adhesion of the coating to Cu foil is good?
I am interested in the technique of obtaining high-quality replicas from diffraction gratings, as well as holograms with surface relief. What materials are best used in this process? Also of interest is the method of processing the surface of the grating to reduce adhesion in the process of removing a replica from it.
Dear experts,
In the area of food packaging materials it is a common way to improve the oxygen barrier of a packaging film by coating it with a poly vinyl alcohol (PVOH) lacquer.
To make a wetting of aqueous PVOH on polypropylen (PP) possible, a treatment with plasma (corona discharge) is mandatory. The surface energy of PP is much lower, than the surface tension of aqueous PVOH, with the plasma treatment the surface energy is increased, and a wetting is possible.
However, after curing, the adhesion of PVOH to PP is quite weak ( < 1 N/15mm). My question is whether somebody has an idea how to increase this adhesion, in the ideal case with a chemical modification/grafting of PVOH. E.g. does it make sense to graft poly acrylic acid (PAA) on PVA to improve the adhesion on PP?
From the food packaging engineers point of view a chemical pre-treatment with PEI might also be an opportunity.
I would appreaciate to get some ideas.
Thanks in advance.
Stefan
Last week, I published a problem. I used soda-lime glass and dip coating into the gel. I driyed 80 Celcius for an hour and 450 Celcius calsination for two hour. But gel layer wasn't adhesion to glass surface.
(My gel gels within an hour and I dip it without aging.)
For some special reason, I hope to reduce the adhesion between AZ-5214E photoresist and silicon wafer. Right now I spin coat AZ-5214E on solvents & DI water rinsed smooth silicon wafer, without the usage of any primer. The adhesion of photoresist is still too good. May I ask if anyone know how to further weaken the adhesion of photoresist?
I know HMDS is a popular primer in the MEMS field. It replace the hydroxyl groups on silicon surface with methyl groups which believes to bond with photoresist better and thus improve the adhesion. However, HMDS also makes the surface more hydrophobic. Hydrophobic surfaces usually have bad adhesion properties (for example, Teflon and PDMS surfaces). Why does HMDS improve adhesion while increasing the hydrophobicity of the wafer surface?
I have a question that seems really simple, however, no one has ever addressed anywhere (of course not in Fluent Manual). That is the wall adhesion option:
I understand It is only there for surface tension, so you can specify a contact angle between the liquid phase and the wall. (Obviously static contact angle, cause I do not see any dynamic contact angle option in Fluent.)
But, what happens if the wall adhesion option is NOT enabled? I test it with two transient thin-film flow cases: Case 1 using wall adhesion with 90-degree contact angle; Case 2 without turning on the wall adhesion at all. They give me exactly the same result.
So, does this mean Fluent still enforces a hidden (default) contact angle (90 degrees) with the wall adhesion option OFF? I haven't found any clear answer so far. I appreciate any related answer or reference if possible.
Hello everybody,
I am trying to do some tests to improve the adhesion of HEK 293T cells in T-flask, and I wanted to ask you which matrix do you think is the best to grow them in.
Thank you very much,
Ismael
How can I prevent curing inhibition of polyurethane adhesive on silicone rubber (apart from using primers). How to 'deactivate' Pt catalyst residues which hamper the curing of my PU adhesive?
If the asphalt is aging test alone, then the adhesion between asphalt after aging and aggregate is enhanced or weakened? Note: asphalt is aged and coated with aggregate, not aged after coated.
What are the advantages of using ITO or thin film FTO substrate (deposited by CBD) and can the use of ammonia (NH3) improve the adhesion and homogeneity of the layer
I want to measure how well nanoparticles can transfect cells based on NP adhesion properties. In the literature I find people do it in animal studies, and epithelial adhesion helps in transfection efficiency through airways.
Is there any in vitro method for measuring how the improved adhesion can influence cell transfection efficiency?
Many thanks,
Teo
Dear All, I would like to know the basic testing of cement plaster for cracking and adhesion . Thank you
