m*********s
发帖数: 1188 | 1 you can DLS for sure to see the size. It give hydrodynamic size but for
polymer materials DLS has a well-established method for MW estimation (
should be an included option in your DLS machine). Also, it can give you the
size distribution/MW distribution.
But, be sue you got a good correlation curve for measurement.
I suspect about the opinion of your DLS technician. Because DLS can measure
polydispersity of particles in solution, while SLS can not do it. It's true
that monodisperse solution wil |
|
b*******n
发帖数: 29 | 2 I got a question when I was reading paper today.
It said "We utilized dynamic light scattering (DLS) to identify the
size of the dendrimer particles in 10-4 and 10-5 M solutions,.......
dendrimer 6 exhibited particles with an average size of about 2.8 nm."
Are 2.8 nm too small for DLS? What is the limit of DLS?
"Dendrimers with Both Polar and Apolar Nanocontainer Characteristics "
JACS, Volume: 126, pp. 15636-15637 |
|
c******x
发帖数: 438 | 3 I have an unknown polymer solution ( at least in visible light), the solvent
is deionzied water. can I use DLS (?any kind of DLS or specified DLS) to
measure molecular weight/distribution, or the particle size/distribution. If
OK, how I can do? I don't know the initial concentration, but I can figure
out to measture the solid content in the solution after freeze drying.
Thanks in advance for any suggestion. |
|
y**a
发帖数: 9065 | 4 【 以下文字转载自 shopping 讨论区 】
发信人: yeca (没事人), 信区: shopping
标 题: att yahoo dls contract
发信站: BBS 未名空间站 (Sun Aug 12 15:49:52 2007)
去年8月签的att dls pro，一年合约，现在时间快到了，但是中间搬过一次家。查看
att网上的service detail,似乎合同又是从搬家以后开始算的。
现在还没有收到过att的合约到期通知，应该现在打电话retention吗？ |
|
c******x
发帖数: 438 | 5 Many thanks. Actually i later talked to a technician about DLS, he said DLS
is better for monodisperse particle or within very short range. For
polydispersity, he said the data may not be trusted, also dust/containmation
can casue a lot of trouble.I only want to find a short-cut, if no other
choice, may play with zimm-plot.Thanks again. |
|
c******x
发帖数: 438 | 6 If no standard, as I mentioned it is unknown polymer, I still can run GPC? I
already ran the DLS, it gave me good correlation curve. The DLS I used is
for size/zeta-potential measurement, so I only got the data of size and
distribution. I couldn't find the option for MW measurement,maybe I need to
ask somebody again. Thanks for your help.
the
measure
true |
|
z*******o
发帖数: 136 | 7 看到一篇paper 用 Brookheaven BI9000AT system 的DLS 测散射光强，然后说正比于
粒子数目，可以这么测吗？我现在用的这台malvern的DLS测不出来啊。
请问还有什么仪器可以测纳米粒子的数目？ |
|
t******a
发帖数: 42 | 8 DLS是测Ｈｙｄｒｏｄｙｎａｍｉｃ SIZE, 包括外面的Surfactants.而TEM 测的是Ag
的尺寸,不包括外面的Coatings. 两种方法都比较准确.如果你用MALVERN 的DLS 仪器
，可以准确到１ｎｍ |
|
z*******o
发帖数: 136 | 9 看到一篇paper 用 Brookheaven BI9000AT system 的DLS 测散射光强，然后说正比于
粒子数目，可以这么测吗？我现在用的这台malvern的DLS测不出来啊。
请问还有什么仪器可以测纳米粒子的数目？ |
|
f*****g
发帖数: 237 | 10 问一个dls测颗粒电荷的问题
最近用dls（zetasizer， malvern）测颗粒电荷，发现这批数据比上一批低了20mv,因
为有同一种东西，所以想问一
下如何校正这个系统参数，达到与上次一致？ 或者是不是我测量有误？
谢谢！ |
|
s*******n
发帖数: 546 | 11 看到周围很多朋友生娃前都买了camcorder，所以也在盘算要买个什么。
现在有个Canon的卡片机10mp的3x，dv连720都不是。
想买个DLS或者camcorder，想以后能拍高清的video，最好也能照好点的照片(应该是像
素高吧)。
budget 1000以内吧。
本人对摄影一窍不通，有朋友买Nikon D90， D5100。我是totally have no idea....
dummy
看canon有个sx40貌似不错。不知道怎么样。
求推荐！！！多谢 |
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n****a
发帖数: 2 | 12 DLS（dynamic light scattering）
实验数据软件，想带回来处理，
自己的电脑打不开
是*.dts文件
有人有这个软件吗？或者转换成一般我们可以打开处理的形式，传给我好吗？
谢谢 |
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S*****n
发帖数: 6055 | 13 I think DLS can get 2.8 nm |
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d***p
发帖数: 306 | 14 【 以下文字转载自 Chemistry 讨论区 】
发信人: ddppp (er'do's耳朵屎), 信区: Chemistry
标 题: DLS对样品的散射能力有什么要求？
发信站: BBS 未名空间站 (Mon Oct 1 21:45:07 2007)
我是想知道样品中粒子总的（散射cross-section/溶液体积）不低于多少时能被检测出
来？ |
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c********r
发帖数: 154 | 15 DLS can measure particle size in water of course. But there is an appropriat
e size range. If the size is below several nm or above several micrometer (n
ot sure the exact range), it does not work. And be aware of the measured siz
e. It is the so-called hydrodynamic size. By the way, static light scatterin
g may be better in some way. Good luck!
solvent
If
figure |
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k*******a
发帖数: 772 | 16 i think
DLS is for size measurement
SLS is for molecular weight measurement
solvent
If
figure |
|
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g***y
发帖数: 4784 | 18 我用DLS测颗粒直径和分布
没听说过测CNT，如果有高级软件的话我也想要一个 |
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s**l
发帖数: 869 | 19 假如颗粒在显微镜里是椭圆，你这个测出来的diameter是长轴还是短轴？
另外这个DLS精确度怎么样啊？是否可靠，比如说至少可以用来作为尺寸变化的证据 |
|
g***y
发帖数: 4784 | 20 颗粒当做球形处理
同样用DLS结果来比较
还算可靠
虽然不可以像电镜照片那样单独作为证据
但是也算有力的辅助证据了，建议与电镜照片同时举证 |
|
s**l
发帖数: 869 | 21 谢了：）
理论上cnt这样的rod在DLS的结果里代表以长度为半径的球状颗粒吗？ |
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D********g
发帖数: 533 | 22 DLS数据处理出来的是 散射半径 也就是说 所有散射的微粒都被等效为一个散射小球 |
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D********g
发帖数: 533 | 23 可以看看高分子物理方面的书
里面有怎样Zimm Plot测量Rg，就是高分子的链段半径，和你说的这个有点像。
CNT不大清楚 没看过文章。 不过我觉得应该和测液晶高分子的Rg差不多。 应该是可行
的。
这个和显微镜的差别在于 显微镜是看的local的性质 而DLS是全局的尺度 最后的结果
是所有CNT的平均尺寸 也许更加有说服力 |
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l********8
发帖数: 7 | 24 DLS测量时通常假设所测样品是球形，至少比较接近球形，而CNT是线形，从仪器原理
上讲这种方法似乎不能用于CNT粒径的测量。 |
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d***p
发帖数: 306 | 25 【 以下文字转载自 Chemistry 讨论区 】
发信人: ddppp (er'do's耳朵屎), 信区: Chemistry
标 题: DLS对样品的散射能力有什么要求？
发信站: BBS 未名空间站 (Mon Oct 1 21:45:07 2007)
我是想知道样品中粒子总的（散射cross-section/溶液体积）不低于多少时能被检测出
来？ |
|
c*s
发帖数: 2145 | 26 这两个要一致似乎很难，做电竞的时候稍微有点defocus，那就是几个纳米的误差，
dls测这么小的颗粒，本来就到下限了，还要和tem比较，晕 |
|
f*****g
发帖数: 237 | 27 最近用dls（zetasizer， malvern）测颗粒电荷，发现这批数据比上一批低了20mv,因
为有同一种东西，所以想问一
下如何校正这个系统参数，达到与上次一致？ 或者是不是我测量有误？
谢谢！ |
|
l**********1
发帖数: 5204 | 28 2 Y wet Bio experience is enough to be a Global top 10 pharm生统的PhD
level graduated 工作?
if LZ does not think so,
pls try free onine web lectures:
by 弯立 陽明大學 生命科學系& 基因科學研究所
生化及細胞分子生物學 I (Biochemistry & Molecular Cell Biology Ⅰ)
pls visit below web link:
HTTP: //dls.ym.edu.tw/sa/dls/dls02/dls02-3/dls2-3-1/newssig.asp?id=13
then selct
10/29 王廷方 講義 click here please download compressed rar file.
more Global top 10 pharm生统的工作
may be neded,
選修 生物科技產業與管理（含上課講義下載） 下載 web link:
HTTP : //... 阅读全帖 |
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l**********1
发帖数: 5204 | 29 FDA approved drug NDA: those repeat tests already have been done
pls refer PPT document:
CRO and CMO of New Drug Development:
HTTP : //dls.ym.edu.tw/sa/dls/upload/2-3/leg/bioindustry/990615.pdf
or
HTTP : //dls.ym.edu.tw/sa/dls/dls02/dls02-3/dls2-3-1/newssig.asp?id=60
more
HTTP : //dls.ym.edu.tw/sa/dls/dls02/dls02-3/dls2-3-1/dls2-3.asp
50 |
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l**********1
发帖数: 5204 | 30 LZ
对这个感兴趣的话
以下的
進階發育生物學 (PDF檔案)
都下载后 看了 再来问 如何?
//dls.ym.edu.tw/sa/dls/dls02/dls02-3/dls2-3-1/newssig.asp?id=42
more
//dls.ym.edu.tw/sa/dls/dls02/dls02-3/dls2-3-1/dls2-3.asp
all are free down except GFW banned them. |
|
|
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o****p
发帖数: 9785 | 33 Ouch...
Drivers from China needs to get a transcript of their DLs if their DLs are
not in dual languages(Chinese/English), this is just to avoid any
unnecessary troubles. Drivers out of the States are allowed to drive with
DLs issued by their home country for up to 1 year.
The latest version of Chinese DL is dual-lingual.
to
you
an
your |
|
i********e
发帖数: 50 | 34
of
非常感谢！请问DLS跟CD是一回事吗？我有未知的纯化样品和已知tetramer的纯化样品
，以前跟老板提过用DLS来做，结果被否决了。他说CD didn't work.我对光学原理真是
一窍不通。DLS是CD？ |
|
s*******g
发帖数: 16 | 35 dls 水平是高，不过pump垃圾股很多。有兴趣的可以看看ECTY，去年dls在168 和几个
人在1.8 一起pump的，后来破产了. 我亏大了 |
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I****8
发帖数: 988 | 36 我被interview过，过程和这个相似，这个是一个老印论坛上看到了，贴在下面：
Just came back from the AOS interview that lasted just under 10 minutes.
Officer said that he will approve the applications as soon as visa numbers
are available come October. As of now there are no visa numbers as far as he
knows. Those who want to read just the summary can scroll down and just
read the summary.. rest ..Keep on reading.
Here is the complete experience -
We(Me and my wife and kid) reached the Local Office at San Jose half an hour
before t... 阅读全帖 |
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B*****e
发帖数: 9375 | 37 巨人对拍子是本周的重头戏，
咱们纸上谈兵的中年WSN们, 没有身材也没有臂力去打NFL，
但脑子就够使么？
嘿嘿, 这里说两个Eli和Brady常使用的排兵布阵法,
周日下午大家看球的时候可能会提高欣赏性.
攻方排好阵型, 如果QB走上来, 喊"Hut Hut!!"就直接开球,
那就是最简单的了, 但这不多见.
一般会跟着有下面两个显著的特点.
*****
Eli经常, Brady有些时候,
会指着对方一个球员大叫"# xx is the MIKE! # xx is the MIKE!!"
但有时候你会看到那个球员已经明显不是middle linebacker,
(或者不是4-3防守, 根本没有MIKE这个位置)
他已经移到SAM or WILL的位置上, 或者已经压上第一线了.
但他仍然被对方两毛五指定为MIKE.
OL有五个人, 在正常情况下防守会有四个杀过来冲击QB,
(4 DLs in a 4-3, or 3 DLs + 1 LB in a 3-4).
QB喊一句谁谁谁是MIKE, 是指出他认为最有可能作为额外的那个冲击者,
告诉OL, 他也是你们的责任: 这些人, 你们五个... 阅读全帖 |
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n***s
发帖数: 10056 | 38 Our new S&C really helped. DLs gained ~10 lbs/each this past a few months. Last year DLs were pushed around. |
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j*****t
发帖数: 5475 | 39 果真是的，大牌都不参与，太过分了！
http://www.guitarcenter.com/GC-Coupon-Details-g25685t0.gc
In-Store Offer Exclusions
The following manufacturers have chosen not to participate in this promotion
in Guitar Center Stores:
Ampeg, Apple, Apogee, Black Cat, Bogner, Bose, Boss (select models), Cusak,
Dangerous Music, Death By Audio, Diamond, DLS, DW Drums (select models), EBS
, Eden, Egnater (select models), EMMA, Empress, Epiphone, ESP, Eventide, EVH
, Fender, Gibson, Fuchs, Fulltone, GNI, Gretsch guitars, Hao, Hard... 阅读全帖 |
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u********o
发帖数: 258 | 40
model coupling theory?你是学物理的吗？找找学软凝聚态物理(soft condensed
matter)的同学，可能他们能给你帮助。
colloid到gel/glass的transition是soft condensed matter研究的重要对象之一，很多
采用了动态光散射技术。
DLS=dynamic light scattering?这个我接触过一些，我的实验在物理系的DLS lab做，去
ISI web of science搜搜，很多相关文章的。Berne写过一本经典的书：
Dynamic light scattering : with applications to chemistry, biology, and
physics，可以一读。
good luck!
写 |
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l**********1
发帖数: 5204 | 41 En
btw LZ can try Wan-wan '國'立陽明大學生科
研究所課程 講義 pdf rar pptx etc files 下載
link:
//dls.ym.edu.tw/sa/dls/dls02/dls02-3/dls2-3-1/dls2-3.asp |
|
l**********1
发帖数: 5204 | 42 sure
almost hand writing within this 酶动力学 field:
pls go to
//dls.ym.edu.tw/sa/dls/dls02/dls02-3/dls2-3-1/newssig.asp?id=13
then
10/08
Prof. 王廷方
講義 icon click here then got compressed rar folder
next decompress that folder
then open that 'Enzyme kinetics (TFW)-2' dot pdf
then Go Go to look a lo 酶动力学how to 和数学结合起来? |
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x****a
发帖数: 1041 | 43 组里最近考虑买个DLS。想请教下那个公司的设备好用。这个设备大概什么价位。
主要用来表征nano particle (无机和有机的都有）。另外，做DLS的时候是不是一定要
知道材料的折射指数？
谢谢
★ 发自iPhone App: ChineseWeb 7.8 |
|
b*******u
发帖数: 75 | 44 搭车求问一下， DLS能测2nm以下的球形聚集物么？ 原来看见过有人说DLS能测普通表
活的micelle，有点不信...... 多谢！ |
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w******r
发帖数: 43 | 45 transition between coil and globule with changing to quality of solvent has
been predicted by theory. B. Chu and he just showed the transtion by DLS. He
did this long time ago. But he characterized the exact transition temperature
of PNIPAM by using DLS. That was done by himself.
Anyway, he is cool. He has a paper about characterization of Teflon by using
fluorinated oligomer as solvent. If my memory is corrent, that is his PH.D.
Solution
大
的
变
问
化
分
构
分
系
多 |
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c******h
发帖数: 4573 | 46
这个你是怎么看出来得？你做DLS的浓度是多少？能确定在溶液中就是单分子么？
怎么能单独从DLS的结果判断到底是sphere-like还是linear？ |
|
m*********k
发帖数: 10521 | 47 成功奖励 20 伪币的用户:
south, waiting140, MarsLynn, bondpont, email5030, dls, Tupac, redrivermoon,
gwrfxj, lilyhe1999, felixcat, yjcs, zbzdsb, gundamzz, nicaibudao, dahai,
cattemplar, tyhu, MemForg, wantusiruifo, hexieNo1, shuihaizi, otheraffairs,
MnMemail, Azhua, lana1972, toldo, waterapple, aquarius923, simplesoul,
pirateyo, wala, yoyofather, yangmoon, rockjohnny, pker, jianye5,
texasredneck, nuonuo12, WillyBass, HH7, rockyroc, pipigou123, felixcat,
donthurtme, melindaz, Qipa
奖励版面:(Badminton)20伪币成功
奖励... 阅读全帖 |
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a****l
发帖数: 1696 | 49 里面的一段话尤其重要。说日本刚投降的几天内，政府发密令给所有外交官，要求他们
从此开始舆论工作，尽力把日本描绘成二战受害者，同时掩盖其战争罪行。这个密令，
被美国知道，但美国是多年后才公布的。公布的时候，冷战已经开始了，那是日本已经
成为欧美的盟友了。
国内很多分析日本的文章，水平都不高。你说日本民族很变态，什么证据？看看人家这
篇文章，用的都是数据，比如被日本抓获的战俘的死亡率比其他国家抓获的要高得多，
然后有具体数据，然后有分析原因。
欢饮翻译成中文然后转帖国内论坛。
http://www.strategypage.com/dls/articles/Japan-Wants-To-Rewrite
Japan Wants To Rewrite World War II
by James Dunnigan
August 22, 2010
August 15th is 65th the anniversary of the end of World War II, the day when
Japan finally surrendered. This year, the annivers... 阅读全帖 |
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