Stadium, Alameda and Research

Here for the last week has given me a chance to do some last minute site-seeing before going back. Today, some of us went to take some pictures of the Olympic Stadium and the Ice Cube so when we get back we can say to our friends and family that we were there as we watch from the TV set. The stadium is truly magnificant to see even from a distance, but It would have been great to be able to see the inside. While we took pictures a formation of guards walked by us, which was interesting to observe...especially since they couldn't keep there eyes off Kelly. Xu was able to catch a priceless picture of this that will hopefully be on the photo diary soon.

After our Olympic excursion, I was able to experience what its like to get a hair-cut in China with my friend Wu Di from lab. Before going I had my doubts, but the hair-cut come out exactly as I hoped with Wu Di's help all with the phrase "Just a little off the top" to my barber in Chinese. Furthermore, it only cost 3oRMB, equivalent to around $4 US, which is a price I could never get a hair-cut for back home. This is why I usually got my roommate during this last year at school to cut my hair for me so I could avoid paying the $20 US that it usually costs for one in Ann Arbor.

Tonight, I also was able to go to a restaurant named Alameda, which had amasing high-class Western food. The placed is tucked in a little unassuming alcove in the Sanlitun bar strip area. Spencer, Donna and myself were all able to get there fairly quick (45 minutes) by taking bus 394 from our appt. and one of the new Subway lines (10). Some of the others didn't want to go since they thought it too expensive at 158RMB; however, I would never be able to find a meal this good or this cheap anywhere else. For this price you get an starter course and an entree that would cost me well in the $60 range to purchase in the US. For my starter I had roasted Asparagus with Mozzorella cheeze and Ceaser Dressing and for the main entree I had Sea-Bass with Grilled Potatoes and Salsa. I might have to venture here again before we leave on Sunday.

Tomorrow is our big presentation day, where a few of us will present our work via an online-feed to other RU programs (2 at U of M, and 1 at Notre Dame). I think it will be a good way to recap what some of us have done and give us a chance to see the work of others, which will be very varied since many of us have worked in different Chemistry labs including Nanochemistry (physical), Organic, Analytical, and Applied. But, before our presentation I think we plan to go to a Museum in the city and then I'm going to have a farewell dinner with my Professor. Even with all the hassle that resulted from the Olympics with work at lab, I'm happy with how this summer ended in the lab has ended. If I pursue grad school, I may come back for a few months out of the year to do some research, which my Professor has encouraged me to think about.

new changes

This week there have been quite a few changes that have appeared as a result of the approaching Olympic games. For instance, on Monday we all had to get photo ID cards made to enter into Peking University's gates. So far I haven't had any problems getting access through the gates after showing my card, but yesterday Spencer got stopped by the guards so the undergraduate student I work with had to help him out. Also, there seem to be many Olympic teenage volunteers around Beijing, who are easily recognized by their blue and white uniforms. Some even look to be helping with traffic crosswalks, which I think is a very noble task given that the intersections here are much more dangerous than back home. Many of the buses are becoming more crowded too since the amount of traffic allowed on the roads is now restricted, which started this last monday. The other day I got bumped into after the bus driver made a halting stop and consequently stepped on a girl's foot in front of me. I tried my best to say "I'm sorry" in Chinese, but even if I said it perfectly she didn't let on. Now, though, since bumps on the bus are becoming more of a frequent part of the ride back to WanLiu, I've gotten used to it.

I continue to be busy in lab with research and am waiting until I finish this coming Thursday/Friday before I work on my final presentation for our lab meeting this Saturday. So far we've been unsuccessful in our attempt to photo-oxidize multi-walled nanotubes, but there's still a few different ways we plan to do this before Thursday that may work so I continue to be optimistic until then. Now, in lab it feels as though I'm much more a part of the group than when I first arrived. I think the more time I've spent here putting in long hours with experiments I garnered more respect. Many of the lab members tell me I work hard, but in reality I work no harder than anyone else. All the lab members in Prof. Liu's lab are very dedicated workers. The undergraduate student I work with, Wu Di, for instance, decided to get a head start with his grad school work by staying here over the summer instead of going home like most undergraduates do when they graduate before they attend their first year of grad school. He's been a great help since he's been collaborating with me on my project. Recently, we've been looking through many papers and thinking of different ways to get our photo-catalyst to work. If I'm not able to get a good result before I leave, I'm confident he will be able to achieve this when I go back from the insight we've gained this summer.

This weekend after as my lab work draws to an end, I plan to go with a student in our lab to visit a modern art exhibit called "789", which requires about a 1hr. bus ride. I hope it will be a fun event to explore.

trip flying by

Yesterday a few of us, which included myself along with Kelly, Zhaleh, Spencer, Alisa, and Donna decided to go see the Peking Man site in Zhoukoudian, which is about 50km southwest of Beijing. I’ve wanted to see this site for awhile since we first arrived, but had trouble figuring out exactly how to get there by bus. Fortunately, Julia from the Joint Institute was able to help me with this last Friday by supplying me with directions and a map. It was quite an excursion, since the whole trip required three buses and some careful monitoring of the Chinese characters for the stops that we wanted to get off at, but we made it there with little difficulty. If future participants in this program want to go here from Wan Liu next year simply take bus 394 to Liu Li Qiao Dong, where you’ll take bus 917 to Fang Shan Dong Da Qiao and then board transfer bus 38 to Zhoukoudian. We knew when we got off at the Zhoukoudian stop that we had arrived at the right place, since we saw a giant-sized brass head of Peking Man outside the exhibit’s entrance about 200m from our stop.

I found Zhoukoudian to be a very tourist friendly place. We were allowed to go into all of the caves that the H. erectus fossils of Peking Man had been found in; however, most of the Peking Man specimens have been recovered from the caves so the current excavation of the site has all but stopped. The peak time of excavation occurred during the 1920’s to the 1940’s, which began with the discovery of a couple of human molars here by Swedish geologist Johan Andersson. My favorite Anthropologist that worked on the site, though, was Fanz Weidenreich, because it was his casts of the original Peking Man skulls (about 40 altogether) that allow us to still know what they looked like, since the original skulls were lost during WWII (now, somewhere at the bottom of the ocean) as they were shipped from China in a US freight to keep them from harm. Since I’m a dual Chemistry and Anthropology major I found the museum to be my favorite part of the exhibit, but I think the others enjoyed lunch the best. When we went to the restaurant for lunch, we had just missed the last serving time of 12:30pm so we were first bummed out since we were both hungry from the long bus ride and because I told everyone that it was supposed to be a four-star restaurant (info I got from an online source). However, even though we were late the chef insisted we stay and instantly made us a delicious vegetable dish from two heads of cabbage and some tomatoes he brought in from an outdoor garden. It was probably some of the best, inexpensive dishes I’ve eaten while here. After the museum and lunch we visited the scientists’ memorial where some of the old anthropologists who worked at the site were buried and also some more of the caves (also called localities) before we headed back to the bus.

To switch gears to research, my work in the lab continues to keep me busy for most of the week, where I run experiments pretty much autonomously now. I am still working on Multi-walled nanotube synthesis and believe I have found the growth conditions (temp, flow-rate) that give me the best aligned nanotube array so now I plan this week to attempt the photo-oxidizing step. One problem I’ve had in lab, though, is finding time to get use on the Scanning Electron Microscope (SEM), since everyone in our lab needs this machine to look at their samples. There was a communication mix-up between my grad student and myself last Sunday where I thought I had been scheduled time to use the machine from midnight to 1am, when he actually meant 12pm to 1pm…so when I got there at midnight the person using the machine was very confused why I insisted on taking his time away from him. However, I’ve made friends with those who are scheduled to use the SEM for long durations, which has given me more accessibility to the machine since they let me view my samples at the same time they look at theirs by putting both of our samples on the same stage in the SEM. I hope this week I can get a lot accomplished so I can begin to prepare my PowerPoint presentation in our lab on my work; it seems many of the lab’s members are eager to hear me speak as I am continually told by others in lab “I hear you will be giving a presentation”. If nothing else it reminds me that I need to move quickly to put my ppt. slides together before my presentation date of July 22. Just writing this date is a shocker, I really can’t believe how fast this study-aboard trip has gone this summer…in 3 weeks I probably won’t want to leave.

nanotube synthesis success

Last Monday in my post I mentioned that I was trying to complete synthesis of a nanotube array on my own. I have, indeed, accomplished this task but it took me a few days to achieve success because as every scientist knows you must usually try many times before you get what you hope for. In my case, it took three tries, so I guess the cliché “three time’s the charm” held true for me. Both of my first two attempts to create a nanotube array ran into error with the last step of the procedure involving the furnace, which uses methane and hydrogen gas to grow nanotubes from the deposited FeO3 catalyst on the surface of silicon wafers. The first time in the middle of the experiment the furnace ran out of hydrogen gas, while the second time was even more frustrating because a grad student accidentally pressed the wrong button on the circuit breaker that powered the furnace and subsequently turned it off during my experiment. However, when I finally achieved construction of a single walled nanotube array (SWNT) with my third attempt, it made my success feel much more worthwhile.

Recently, instead of doing SWNT synthesis I have been given the project to make multi-walled nanotubes (MWNTs), since we want to see if we can cut these nanotubes with our photocatalyst. If this is possible, it will have great implications for nanotube devices in the future if such cutting can be done on a large-scale. Surprisingly, MWNTs are much easier to make than SWNT since some of the preliminary steps can be taken out, such as exposing the silicon wafers to the piranha solution; this is because with MWNTs it is not as important for the silicon dioxide surface to be protonated by this highly acidic solution. The only preliminary steps that need to be done with the wafers are to expose them to acetone in a water-bath for 10 minutes, then in ethanol for 10 minutes. The rest of the procedure is carried out in the furnace. I was very fortunate to get one of the grad students familiar with MWNTs to walk me through how the engineering dynamics of the furnace work, which actually is a very simple process. In contrast to SWNT, the carbon source for MWNT synthesis is held in a cylinder at the bottom of the furnace as opposed to the methane gas flow, which serves as the carbon source in SWNT synthesis. Therefore, Argon gas is used to carry the carbon source in the furnace to the quartz tube where the reaction happens. The grad student who helped me with this was named Yongyi Zhang and he will be going to U of M this coming fall for a Post Doc position in the Mechanical Engineering Department. Other students in the lab told me before that Yongyi is sort of the engineering genius in the lab, where if something breaks he’s the one to fix it. I had no question about this statement after we worked together. For example, he fixed a small electrical device, which we needed to heat up the iron cyclohexane catalyst in the quartz tube, by detaching, reattaching, and splicing wires together. I do believe he might become a great professor at U of M in the near future because of his engineering expertise and his ability to teach others---in this sense U of M is very lucky to have him. In the last few days Yongyi has been looking online for housing at U of M, which I have tried to help him with; however, this is no small task since much of the housing close to North Campus is already taken and it is very difficult to make any arrangements with landlords when you’re not in Ann Arbor. I know I have hard enough time myself to find close, affordable housing each year I’ve lived off-campus in Ann Arbor. Melody and I have talked about this on numerous occasions; I sometimes think students are more stressed out with housing negotiations than with classes during the “house signing time” of the year. Nevertheless, I hope to help Yongyi find a few places that might work out for him.

When I get back to campus in the fall I hope to take what I’ve learned from nanotube synthesis and apply it to biology. Since professor Liu’s lab is focused strictly on Physical chemistry, I don’t have a chance to pursue this type of research at the present moment, but feel nanotubes could have many implications in biological science such as with molecule detection and cancer research. In fact, one of Professor Liu’s former students named Hongjie Dai has conducted a lot of biological research with nanotubes at Stanford University. In one of this papers, I read, he attached the peptide RGD onto nanotubes and subjected these tubes through the bloodstream of mice to determine the efficiency with which these nanotubes contact localized tumors that express the alpha(v)beta3 cancer integrin. Though some of these nanotubes were found in the liver upon dissection, many of them localized to the site of the tumor; this is a promising result since it implicates the Kanzius RF (microwave) therapy as a potential treatment that might be available to cancer patients in the near future. Another one of Prof. Dai’s papers involves drugs bound to nanotubes through base-stacking, which could be equally promising. Therefore, one thing I have learned from my research experience so far is just how connected all the sciences are to one another, whether that is physical chemistry, biology, physics, or engineering. If I had came to this revelation earlier, I probably would have taken some of my former courses like physics of physical chemistry more seriously, now I have a new found passion for these two areas of science.