Tuesday, December 29, 2009

Cleaner Air and Water Possible with Improved Photocatalytic Nano-Crystalline TiO2 Thin Films Developed by Chinese University of Hong Kong Researchers


In U.S. Patent  7,638,555Chinese University of Hong Kong (CUHK) (Hong Kong, CN) inventors Professor Chai-Mei Jimmy Yu and Jun Lin reveal photocatalytic nano-crystalline titanium dioxide (TiO2) thin films with improved catalytic activity and their manufacturing methods.  The TiO2 thin films can be used for killing bacteria and viruses in an environment under ultraviolet irradiation. The TiO2 thin films have higher photocatalytic activity, and can particularly be used to photocatalytically degrade organic pollutants in the air by killing bacteria and viruses.

Compared with the prior art, the invention has many advantages in that the TiO2 thin film can be formed onto all kinds of substrates in various shapes without any specific manufacturing apparatus. The TiO2 thin film can be readily doped with other components by coating essential components for the TiO2 thin film together with the other components. The TiO2 particle's size in the thin film can be controlled by changing the molar ratio between the surfactant and water in the reverse micelle solution. The phase constitutions can be controlled by the thermal treatment of the thin film.  The thin film has a larger specific area and a higher activity of killing bacteria and viruses due to its nano-structure.

The manufacturing method includes:


a) providing a reverse micelle solution containing highly-dispersed water nano-droplets, which is made from an organic continuous phase, a non-ionic surfactant and water;

b) adding an alkyl titanate to the reverse micelle solution and subjecting titanium alkoxide to being hydrolyzed in said nano-droplets of the reverse micelle solution to form a TiO2-containing solution;

c) forming a wet film onto a substrate dipped into the TiO2-containing solution by a dip coating technique; and

d) drying the wet film and calcining the dried film.


FIG. 4 is a scanning electron microscope image of a TiO2 thin film on stainless steel calcined at 500.degree. C. for 3 hours which exhibit improved photocatalytic activity made by CUHK process.


 Image Source: U.S. Patent  7,638,555, Figure 4.

Researchers at the CUHK have successfully developed state-of-the-art photocatalytic oxidation technology with the support of the Innovation and Technology Fund, and transferred the new invention to industry. NanoPCO ™ technology has been commercialized and licensed to EnvironmentalCare Ltd., a company selling environmental protection products for use in high-end water treatment and air purification systems. 

The first application of this new technology, developed by Prof. Jimmy Yu Chai-mei of the Department of Chemistry, leads to a very safe and attractive water treatment system which has been proven to be more effective than conventional UV irradiation. It can be used to treat drinking water, industrial or agricultural waste water, and sea water. Currently water treatment systems employing NanoPCO ™ technology have been installed in many Hong Kong seafood restaurants. 


The second license introduces a new approach for cleaning up air which overcomes the poor solar efficiency of traditional photocatalysts, making commercialization possible. This air purification system can be installed at hospitals, offices, schools, restaurants, and homes.

The Chinese University of Hong Kong
Technology Licensing Office
Rm 328, Pi Ch'iu Building Shatin, N.T. Hong Kong SAR
Tel: (852) 2609 8885 Fax: (852) 2603 5451

23 comments:

  1. Such a nice post, it is really interesting,you are really a hard worker guy, Thanks.


    College Research Papers

    ReplyDelete
  2. Hi, nice post. I have been thinking about this topic,so thanks for sharing. I will likely be coming back to your blog. Keep up the good work

    Advantage Term paper help – We do it your way

    ReplyDelete
  3. I think this is one of the best blog for me because this is really helpful for me. Thanks for sharing this valuable information for free packers and movers in patna

    ReplyDelete
  4. Understudies have numerous kinds of issue identified with school task. So we have an accomplished master for composing a task. In the event that you have any issue with composing a task.
    assignment help

    ReplyDelete
  5. Hire online assignment writers from studentsassignmenthelp.com where well-trained assignment writers offer you the NZ's best assignment help Auckland services at a very cheap price.

    ReplyDelete
  6. Nice to be visiting your blog again, it has been months for me. Well this article that i've been waited for so long. I need this article to complete my assignment in the college, and it has same topic with your article. Thanks, great share.
    rta bus timings

    ReplyDelete
  7. Your article is attractive and informative. Thank you for sharing. Any student pursuing nursing should be passionate about it. Even though it is important to attain high scores, there’s a need to go the extra mile in delivery of services to the patients which is a skill that may not be learned in school. Also, nursing students need to understand nursing concepts and be able to implement them in real life. They have to carry out a lot of research especially when they have assignments to handle. Learn more from Nursing Assignment Help .

    ReplyDelete
  8. It’s a very attractive article thank you for sharing. A Statement of Purpose (SOP) is an application document that basically tells the reader who you are, your professional interests, what has influenced your career as well as your professional goals. The SOP gives you a platform to talk directly to the admissions committee. In other words, a statement of purpose gives you an opportunity to convince the admission committee that you are the right candidate among many qualified applicants. Learn more from SOP Writing Services .

    ReplyDelete
  9. Thank you for sharing such an informative article looking forward for part 2. Cycling outdoor could have been easy and very much achievable during one’s youth but it certainly isn’t in the golden years. Beyond age 60 people tend to tone down to less strenuous exercises. Well, you do not have to switch to other exercises if you are still passionate about cycling. Take advantage of Recumbent Bikes for Seniors .

    ReplyDelete
  10. Such a wonderful information blog post on this topic Allassignmentservices.com provides assignment service at affordable cost in a wide range of subject areas for all grade levels, we are already trusted by thousands of students who struggle to write their academic papers and also by those students who simply want ERP assignment writing help to save their time and make life easy.

    ReplyDelete
  11. I love the art of writing you possess. Good job man. Writing capstone project is paved with myriad challenges. At this point, there’s one important but unanswered question: “who’ll do my capstone project?” That’s a great question to pose at this time. But it may not be the best question someone in your predicament should ask. The best question to ask would be: “i need help with my capstone project?” That’s because a successful capstone project is rarely the result of unassisted effort. So, stop digging around the web for someone to alleviate your problem. Do My Capstone Project is here for you.

    ReplyDelete
  12. I couldn’t ignore the art of writing you have to ensure you deliver the best. If you are a student working on a paper that requires data analysis such as a statistical research project or a dissertation on the location of features and boundaries around the earth, the major challenge you are likely to face is getting a better understanding of the data and materials that you’ve gathered. Go ahead and reach out to us for Dissertation Data Analysis Help

    ReplyDelete
  13. Thank your dear, for making such as important information. I hope you will update this information to add more value if needed, thank you again take care.
    Internal Financial Control in Delhi

    ReplyDelete
  14. This article is extremely educational lastly I got what I needed. Thank you kindly for this Information.
    business advisory firm, compliance outsourcing services 

    ReplyDelete
  15. I’ve enjoyed reading through your article. This is a great post. Before you know it, you’ve run out of all of the time. At that point, the project becomes some sort of an emergency. That’s when finding some DNP capstone project help starts feeling conceivable. This page presents a few tips to help you successfully manage the DNP project writing process. Read more on DNP Capstone Project Writing Help .

    ReplyDelete
  16. Thank you so much for such a quality article. Our dissertation data analysis services are meant to help students complete their dissertations without stress. Our writers can either write your dissertation from scratch or complete the part the customer requests. Most of the requested parts are the methodology, data analysis, findings and the conclusion part. However, we can also complete the other parts which include the abstract, introduction, literature review, problem statement and any other part as required. Now you can get Help With Data Analysis For Dissertation

    ReplyDelete
  17. This article has brought to an end my long internet search thank you. You’re a fresh DNP candidate. At this time, it’s too early to start worrying about your DNP capstone project. Possibly, the idea of working with a quality DNP capstone project writing service hasn’t crossed your mind. You still have time, don’t you? But time keeps playing tricks on people. At the start, it may feel like you’ve got more than enough time. Time flies, though. Before you know it, you’ve run out of all of the time. Read more on DNP Project Help

    ReplyDelete
  18. Thank you for this amazing article. A nursing capstone project is an academic paper that utilizes practical work experience, experimentation, and facts. It helps you identify real-world issues and apply them. In nursing, a capstone project is done through research or solving an identified problem. Nursing capstone projects reinforce best practices in different nursing fields because they are evidence-based practice. Read more on Nursing Capstone Project Help

    ReplyDelete
  19. If you're feeling such as you have lost the zeal and intimacy of your sexual life then a reliable sexologist in Delhi are a few things that you just actually would like. He has registered himself within the list of the highest purported sexologist. you've got got it here! he's Associate in Nursing honorable name within the trade of sexologist treatment. and best sexologist in Delhi or top sexologist in Faridabad.

    ReplyDelete
  20. Thank you for posting such a great article. Keep it up mate.

    ttms net banking

    ReplyDelete
  21. Do you enjoy soaking in the tub or taking a long bath? You may have trouble fitting in it due to the small Bathtub. Does it ever get uncomfortable to use it? Well, we’ve got the best solution available for you. You should not be concerned about someone at home being tall and unable to use the Bathtub to relax. Tall people can find relaxing in a rather congested bathtub very uncomfortable. Read more about Bathtub for Tall People

    ReplyDelete
  22. The CIPD Level 7 Advanced Diploma in Strategic People Management is a professional qualification designed to stress your strategic thinking and handling of complex people management and business decisions. Therefore, if you are pursuing this CIPD qualification, you will be able to develop the latest specialisms essential for your organization to thrive in an ever-changing business context. Read More CIPD Level 7 Assignment Help

    ReplyDelete
  23. Among academic projects, which postgraduate students dread writing, is a capstone paper. Regrettably, it is impossible to avoid producing it, when pursuing a DNP degree. Among the key graduation requirements of this program is submitting a capstone that meets the set standards. It may prove useful for you to request for DNP Capstone Project Help .

    ReplyDelete