a********y
发帖数: 386 | 1 【 以下文字转载自 Living 讨论区 】
发信人: absenttony (absent), 信区: Living
标 题: attic insulation选fiberglass还是cellulose?
发信站: BBS 未名空间站 (Thu May 26 00:23:20 2016, 美东)
坐标加州湾区。请人来做，用两个价格都是一样的。大概看了下网上的说法，基本上就
是fiberglass的厂家说fiberglass好，cellulose的厂家说cellulose好。总体来说似乎
互联网上喜欢cellulose的占上风。我不太在意环保属性，主要考虑是安全性和实用性。
安全性。貌似fiberglass曾经被列为致癌物质然后又平反了。cellulose没有说已知的
安全隐患？所以这个上面cellulose可能比较好一些。曾经cellulose是有火灾隐患的，
现在因为加了化学物质说是没有火灾隐患了，但不知道时间久了会不会失效？
粉尘数量。这个众说纷纭。虽说都在attic没啥影响，但总也有难得爬上去的时候。不
知道哪个实际上粉尘更大点？
实用性。貌似fiberglass怕特别冷的... 阅读全帖 |
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m****s
发帖数: 18160 | 2 【 以下文字转载自 Postdoc 讨论区 】
发信人: iamleo (Northwestern Wolf), 信区: Postdoc
标 题: Postdoctoral position in cellulose nanomaterials and nano-m (转载)
发信站: BBS 未名空间站 (Thu Nov 14 22:54:53 2013, 美东)
发信人: iamleo (Northwestern Wolf), 信区: Chemistry
标 题: Postdoctoral position in cellulose nanomaterials and nano-mechanics
发信站: BBS 未名空间站 (Thu Nov 14 22:51:41 2013, 美东)
Job Description
We are currently seeking application for postdoctoral positions in the area
of cellulose nanomaterials and nano-mechanical characte... 阅读全帖 |
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a********y
发帖数: 386 | 3 坐标加州湾区。请人来做，用两个价格都是一样的。大概看了下网上的说法，基本上就
是fiberglass的厂家说fiberglass好，cellulose的厂家说cellulose好。总体来说似乎
互联网上喜欢cellulose的占上风。我不太在意环保属性，主要考虑是安全性和实用性。
安全性。貌似fiberglass曾经被列为致癌物质然后又平反了。cellulose没有说已知的
安全隐患？所以这个上面cellulose可能比较好一些。曾经cellulose是有火灾隐患的，
现在因为加了化学物质说是没有火灾隐患了，但不知道时间久了会不会失效？
粉尘数量。这个众说纷纭。虽说都在attic没啥影响，但总也有难得爬上去的时候。不
知道哪个实际上粉尘更大点？
实用性。貌似fiberglass怕特别冷的天。这个我在湾区，应该不用担心这个了。
时间长久后的settle问题。这个两个都有说会settle，不知道哪个更经久耐用一点？
防虫防老鼠。这个貌似是cellulose好，因为里面有化学药品。不过不知道久了会不会
失效？
重量。cellulose中，不知道会不会有什么影响？ |
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j***b
发帖数: 5901 | 4 【 以下文字转载自 Stock 讨论区 】
发信人: jszhb (金嗓子喉宝), 信区: Stock
标 题: 关于cellulose insulation，再说说"interest groups".
发信站: BBS 未名空间站 (Wed Oct 27 23:32:59 2010, 美东)
最近在考虑加insulation的问题。在cellulose和fiberglass之间犹豫不决。于是上网
做了些research。有以下发现：
首先，cellulose有很多由于fiberglass的地方。便宜，不透气，驱虫，驱老鼠。等等
。但是我在一个论坛上发现许多post说cellulose有火灾危险。一些说的很耸人听闻。
多年形成的敏感性立刻让我感觉这里有interest group。于是上wiki看了一下，发现一
下段落：
"The fiberglass industry meanwhile benefited from most of the regulations
passed by the federal government. The heavy lobbying by the... 阅读全帖 |
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j***b
发帖数: 5901 | 5 最近在考虑加insulation的问题。在cellulose和fiberglass之间犹豫不决。于是上网
做了些research。有以下发现：
首先，cellulose有很多由于fiberglass的地方。便宜，不透气，驱虫，驱老鼠。等等
。但是我在一个论坛上发现许多post说cellulose有火灾危险。一些说的很耸人听闻。
多年形成的敏感性立刻让我感觉这里有interest group。于是上wiki看了一下，发现一
下段落：
"The fiberglass industry meanwhile benefited from most of the regulations
passed by the federal government. The heavy lobbying by the more centralized
fiberglass and mineral insulation manufacturers helped pass the tough fire
standards for cellulose insulation. These standards wer... 阅读全帖 |
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j***b
发帖数: 5901 | 6 Believe me, fiberglass insulation will be phase out in the matter of a
decade or so. There's no reason not to. Cellulose is a better insulator, it
also provides air sealing ability. If you insulate with cellulose, you don't
need vapor barrier, again saves money. It's estimated that using cellulose
will make your energy bill about 20% less than if you use fiberglass. It's
cheaper than fiber glass, and it's green.
The only reason fiberglass is still in use is because first, the lobbying of
the fib... 阅读全帖 |
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h**********r
发帖数: 671 | 7 Title: Immobilization of Lactococcus lactis to cellulosic material by
cellulose-binding domain of Cellvibrio japonicus
DOI: 10.1111/j.1365-2672.2010.04757.x
Journal of Applied Microbiology
Volume 109, Issue 4, pages 1274–1283, October 2010
My Email is m******[email protected]. Thank you so much! |
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c**i
发帖数: 6973 | 8 Sarah Nassauer, Why Wood Pulp Makes Ice Cream Creamier. Wall Street Journal,
May 4, 2011.
http://online.wsj.com/article/SB1000142405
2748703834804576300991196803916.html
Note:
(a) colloid
http://en.wikipedia.org/wiki/Colloid
(A hydrocolloid is defined as a colloid system wherein the colloid particles
are dispersed in water)
Chemically, a typical hydrocolloid is emulsion, where an individual particle
with an oil core is separated nd stabilized--so that the oil droplets will
not rise to the top--b... 阅读全帖 |
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j***b
发帖数: 5901 | 9 The fact that fiberglass isn't as emphasized as a health hazard as Shi2
Mian2 (I can never spell that word) is partially because the heavy lobbying
of the fiberglass industry. It used to be consider as causing lung cancer, but
then removed from the list.
If I build a new house in the future, I will see to it that only cellulose insulation is used. It performs better because it prevents air leak. Fiberglass is very poor insulator since it allows air to flow through it rather easily. It's said tha... 阅读全帖 |
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j***b
发帖数: 5901 | 10 Actually, if you compare cellulose against fiberglass, the fact is that
fiberglass insulation has no reason to be still in the market. Cellulose
simply does everything better than fiberglass. |
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s*i
发帖数: 1402 | 11 这话说的，你这些claim难道不是cellulose的lobby集团搞出来的？
it
't
cellulose
of |
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j***b
发帖数: 5901 | 12 Eventually, it's not really about who said it. It's still going to be said
by someone. Everyone has interest. So it's still yourself who make the
conclusion. Even interest groups seldom made official claims that are false.
They don't say they have scientific evidence because they don't have.
From wiki
Mold and Pest Control
The borates in cellulose insulation provide superior control against mold.
Installations have shown that even several months of water-saturation and
improper installation did ... 阅读全帖 |
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G**P
发帖数: 369 | 13 今年冬天不太冷，加INSULATON的事都快忘了。直到昨天MASS SAVE提醒我跟他们签的加
INSULATION的CONTRACT才想起这个问题。
现在好像很流行cellulose BLOWN-IN insulation, 请问cellulose是不是真的很容易着
火？ 这个BLOWN-IN的INSULATION是不是很MESSY？不如BATTED ROLL好？
谢谢分享您的看法。 |
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C*******d
发帖数: 15836 | 14 cellulose一般有防火添加剂，所以不会那么容易着火。
cellulose一般更便宜，更容易装，更快，更Messy，更均匀，绝缘性更好（BATTED
ROLL很容易留空隙）。 |
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j***b
发帖数: 5901 | 15 By the way, be careful with fiberglass insulation. I'm still feeling itchy in my throat after like a week. That stuff isn't much safer. Actually, I think cellulose is way better than fiberglass. I wish I had it in my house, but it isn't.
When look at stats, don't just be assured by the low fatality rate. You can be very miserable and ... alive. |
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j***b
发帖数: 5901 | 16 I also judge from the way an argument is made.
For example, those argue against cellulose say that it can't be guaranteed that every single bag of the insulation is well treated with chemical so that it won't burn. This is typical fear tactic. This argument can be used in anything. So anything is unsafe if this argument is valid.
I also love the way wiki is always discredited left and right. Like it's just a useless website. |
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j***b
发帖数: 5901 | 17 There is no research or scientific evidence that shows cellulose is flammable. There are only anecdotal evidence "I know someone..." and so on. Or even worse, simply fear mongering arguments that's not even backed by anecdotal evidence. |
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s*i
发帖数: 1402 | 18 我铺过fiber glass，cellulose必须要那个机器喷出来吧，方便这一点上，还是fiber
glass好一点。 |
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f****i
发帖数: 20252 | 20 我家阁楼上两个都有，cellulose明显味道大 |
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j***b
发帖数: 5901 | 21 Let's put it this way, they don't say something that are out right lies.
They may say something vague but usually not OUT RIGHT LIES.
For example, if they don't have scientific evidence, they will not say they have, because it's OUT RIGHT LIE. But they will still say that cellulose is a fire hazard, which is false.
I hope I have got myself understood. |
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f****i
发帖数: 20252 | 22 那你认为global warming论使用的线性外推法是不是bloody lie？
they have, because it's OUT RIGHT LIE. But they will still say that
cellulose is a fire hazard, which is false. |
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i***e
发帖数: 9429 | 23 应该是cellulose效果好， 不过我还是喜欢fiberglass的， 干净点。 |
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a********y
发帖数: 386 | 24 谢谢 是说cellulose飞起来的颗粒太多么？
★ 发自iPhone App: ChineseWeb 11 |
|
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s**********x
发帖数: 4593 | 26 demin是recycled的牛仔裤
也是cellulose的一种 |
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z**h
发帖数: 224 | 27 【 以下文字转载自 Chemistry 讨论区 】
发信人: zzwh (微尺度爱情), 信区: Chemistry
标 题: 那里可以买到不同分子量的 cellulose?
发信站: BBS 未名空间站 (Thu Apr 22 19:46:31 2010, 美东)
thanks. |
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d****g
发帖数: 40 | 28 1. Are those transparency films cellulose triacetate?
2. Where can i get this kind of film?
Thanks! |
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z**h
发帖数: 224 | 29 【 以下文字转载自 Chemistry 讨论区 】
发信人: zzwh (微尺度爱情), 信区: Chemistry
标 题: 那里可以买到不同分子量的 cellulose?
发信站: BBS 未名空间站 (Thu Apr 22 19:46:31 2010, 美东)
thanks. |
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z*h
发帖数: 773 | 30 Science -- Could Wood Feed the World
http://news.sciencemag.org/sciencenow/2013/04/could-wood-feed-t
The main ingredient of wood, cellulose, is one of the most abundant organic
compounds on Earth and a dream source of renewable fuel. Now, bioengineers
suggest that it could feed the hungry as well. In a new study, researchers
have found a way to turn cellulose into starch, the most common carbohydrate
in the human diet.
Ethanol is today's most common biofuel used to power vehicles. It's
typically... 阅读全帖 |
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H********g
发帖数: 43926 | 31 https://www.technologynetworks.com/applied-sciences/news/from-poop-to-paper-
298888
It’s likely not the first thing you think of when you see elephant dung,
but this material turns out to be an excellent source of cellulose for paper
manufacturing in countries where trees are scarce, scientists report. And
in regions with plenty of farm animals such as cows, upcycling manure into
paper products could be a cheap and environmentally sound method to get rid
of this pervasive agricultural waste.
The... 阅读全帖 |
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g********y
发帖数: 45 | 32 please send to: w*********[email protected], thanks a lot!
http://www.actapress.com/Abstract.aspx?paperId=29911
Renewable Materials for Tissue Repair/Biocompatibility of Cellulose
Nanocrystals
E.-M.U. Egertsdotter and C.K. Aidun (USA)
Keywords
cellulose nanoparticles, Atomic Force Microscope, biocompatibility
Abstract
The surface of cellulose displays hydroxyl groups can be reacted to a broad
range of molecules adding unique properties to cellulose surfaces. This
opens for possible applications for... 阅读全帖 |
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z*h
发帖数: 773 | 33 Of course 二三流的杂志Editor judge 科学家 is 一流 nor not. It is a silly
system. Give you an example, our paper on conversion of cellulose to starch
was rejected by Nature and Science without review. It will be one of the
most important breakthroughs in the human history.
See the PNAS paper http://www.pnas.org/content/early/2013/04/12/1302420110
Abstract
The global demand for food could double in another 40 y owing to growth in
the population and food consumption per capita. To meet the world’s future
food... 阅读全帖 |
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s*******s
发帖数: 623 | 34 谁叫人家是名人呢～
http://www.ncbi.nlm.nih.gov/pubmed/22123987
Proc Natl Acad Sci U S A. 2011 Nov 28. [Epub ahead of print]
Synthesis of three advanced biofuels from ionic liquid-pretreated
switchgrass using engineered Escherichia coli.
Bokinsky G, Peralta-Yahya PP, George A, Holmes BM, Steen EJ, Dietrich J,
Soon Lee T, Tullman-Ercek D, Voigt CA, Simmons BA, Keasling JD.
Source
Joint BioEnergy Institute, 5885 Hollis Avenue, Emeryville, CA 94608.
Abstract
One approach to reducing the costs of advanced bio... 阅读全帖 |
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j***b
发帖数: 5901 | 35 A vapor barrier may not be needed with cellulose insulation. For example,
recent studies have shown that air movement is the primary method by which
excessive moisture can accumulate in mild marine climate such as Portland,
OR, USA.[6] An insulation that fills the wall cavity completely (such as
cellulose or foam) can help prevent moisture problems. Recommendations
against using vapor barriers with cellulose insulation are supported by
studies, even though they classify cellulose as vapor perme... 阅读全帖 |
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z*h
发帖数: 773 | 36 Abstract
The global demand for food could double in another 40 y owing to growth in
the population and food consumption per capita. To meet the world’s future
food and sustainability needs for biofuels and renewable materials, the
production of starch-rich cereals and cellulose-rich bioenergy plants must
grow substantially while minimizing agriculture’s environmental footprint
and conserving biodiversity. Here we demonstrate one-pot enzymatic
conversion of pretreated biomass to starch through a ... 阅读全帖 |
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z*h
发帖数: 773 | 37 【 以下文字转载自 ECUST 讨论区 】
发信人: zyh (CH2O), 信区: ECUST
标 题: From nonfood biomass to starch
发信站: BBS 未名空间站 (Mon Apr 15 18:26:35 2013, 美东)
Abstract
The global demand for food could double in another 40 y owing to growth in
the population and food consumption per capita. To meet the world’s future
food and sustainability needs for biofuels and renewable materials, the
production of starch-rich cereals and cellulose-rich bioenergy plants must
grow substantially while minimizing agriculture’s environmenta... 阅读全帖 |
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z*h
发帖数: 773 | 38 【 以下文字转载自 Chemistry 讨论区 】
发信人: zyh (CH2O), 信区: Chemistry
标 题: From nonfood biomass to starch (转载)
发信站: BBS 未名空间站 (Mon Apr 15 18:28:25 2013, 美东)
发信人: zyh (CH2O), 信区: ECUST
标 题: From nonfood biomass to starch
发信站: BBS 未名空间站 (Mon Apr 15 18:26:35 2013, 美东)
Abstract
The global demand for food could double in another 40 y owing to growth in
the population and food consumption per capita. To meet the world’s future
food and sustainability needs for biofuels and renewable materials, the
production of ... 阅读全帖 |
|
z*h
发帖数: 773 | 39 【 以下文字转载自 ECUST 讨论区 】
发信人: zyh (CH2O), 信区: ECUST
标 题: From nonfood biomass to starch
发信站: BBS 未名空间站 (Mon Apr 15 18:26:35 2013, 美东)
Abstract
The global demand for food could double in another 40 y owing to growth in
the population and food consumption per capita. To meet the world’s future
food and sustainability needs for biofuels and renewable materials, the
production of starch-rich cereals and cellulose-rich bioenergy plants must
grow substantially while minimizing agriculture’s environmenta... 阅读全帖 |
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c**i
发帖数: 6973 | 40 You say, "你跟本不用查找专业文献，反渗透膜是porous 的高分子材料，有点高分子
物理知识的人都知道温度降低，高分子链的热物理性能和构型会发生改变，这样膜的孔
径就会收缩，透水率就会明显降低."
In the primary school, we learn that if we heat a metal with a hole, the
hole will be bigger. Search the Web, with the terms (metal hole heat).
What is used in reverse osmosis (RO) is not metal but polymer. Thus there is
nothing intuitive about how pore will behaves. Indeed emperically there are
two types of pores in a RO membrane.
(1) That temperature affects membrane permeability is a fact. ... 阅读全帖 |
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C*******d
发帖数: 15836 | 41 谢谢SirCOFFEE的热情鼓励和大包子。作为一个极其关注节能并且积极实践的人，我在
此把我的一点冬季房屋保暖的个人经验与大家分享。希望能够抛砖引玉，也希望大家批
评指正。
温度测试：
能够快速探测室内各个部分的温度，比如墙壁，门窗，空调出气口，壁炉等等的温度
对于检测房屋的绝缘和空调的运行极为重要。红外遥感温度仪是完成这一任务的极为有
效的工具。我用的是在Amazon买的kintrex irt0421 non-contact infrared
thermometer with laser targeting，用了两年多了，非常的满意，全力向大家推荐。
很多大的漏风可以简单的用手放在可疑处就可以感觉到。燃香据说也可以判断漏风，但
是从我的经验看还不如用手。
窗户：
尤其对老房子，窗户漏风经常是一个非常重大的热量散失的通道。有很多窗户用手就
可以明显感觉到外面进来的凉风。堵塞这些风口就成为一个非常重要的问题。有人直接
用Shrink window kit，但是我觉得如果窗户本身漏风严重的话，还是要从堵窗户开始
。否则，外面的凉风很容易接触到Shrink window kit，... 阅读全帖 |
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j******8
发帖数: 1006 | 42 I did the cellulose @ my house years ago, not too bad. my house is very old
and have no insulations either. rented a blower machine and bought some
cellulose from HD. You have to drill a 1.5" to 2" hole between each stud,
have someone operates the machine, and you will need to hold the hose and
spray the cellulose into the hole. |
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S********t
发帖数: 76 | 43 我家是80年代的房子，发现冬天楼上冷，房子保温不太好。找了做insulation的公司来
看，说是阁楼的insulation太少了，只有3寸左右。他们说需要加到13到16寸厚，达到
R38的值才好。找了两家公司报价，价格差很多，所以准备找大家问问。我家阁楼面积
大约700尺。
公司1：说$2.5/square foot。这样就要1750美元；说加14至16英寸厚的insulation，
加到 R38。
公司2：说总价$980，加12英寸的cellulose insulation，加到R60。
我问可不可以用Batt insulation，他们都说不做这个材料。还说这个材料不如
cellulose insulation好。
我觉得为什么都是本地公司，报价差别这么大。还有那个R value，怎么说出来都不一
样？我看Batt insulation看起来好像比较好安装。是不是因为这个原因公司才不做？
我想问各位大牛，第一：他们价格合理吗？第二：自己装batt insulation可行吗？大
约要花多少？如果差不多，我就让他们装cellulose insulation了。 多谢。 |
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s*******s
发帖数: 623 | 44 Job ID: GF2011A001
Posting Title: Research Scientist/Research Associate/Bacterial Geneticist
Brief Introduction of Gate Fuels Inc.: “Imagination, Innovation,
Implementation --- Enabled Technologies for a Green Clean World”
Gate Fuels Inc. is a research start-up firm based in Blacksburg, VA, with
the goal of developing microbial and cell-free platform technologies that
enable low-cost production of biochemicals and biofuels. The first platform
is based on industrially-safe Bacillus subtilis. Thi... 阅读全帖 |
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c*h
发帖数: 33018 | 45 【 以下文字转载自 Living 讨论区 】
发信人: Clearmind (Clearmind), 信区: Living
标 题: 冬季房屋保暖的个人经验分享
发信站: BBS 未名空间站 (Thu Dec 9 20:05:09 2010, 美东)
新加了：个人防护，热水管的保暖，空调的密封和使用，和新产品新技术。
更新了：墙壁，并增加了密封材料的标准名称以便大家购买。
=================
谢谢SirCOFFEE的热情鼓励和大包子。作为一个极其关注节能并且积极实践的人，我在此把我的一点冬季房屋保暖的个人经验与大家分享。希望能够抛砖引玉，也希望大家批评指正。
＝＝＝＝个人防护：
在增加房屋保暖绝缘的过程中，有时会涉及接触后对人体有刺激的物质，比如Fiberglass insulation和Expansion foam。在其他时候保护自己不被灰尘粗糙的表面伤害也很重要。一下是常用的防护工具：
Ｎ95口罩（大约$1-$2/个。强烈不建议使用很便宜的廉价低劣口罩，效果不好。毕竟是自己的肺，进入杂质很不舒服而且难清除）。
Safety Glasses
Rubber ... 阅读全帖 |
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f*******c
发帖数: 94 | 46 Chenchuan,
Who are you? do not paste this kind funny breakthrough again!
Do you cellulose ethanol is not compatitive and higher cost than starch
ethanol with established platform except one company in German or Denmark
can marginally compete with starch etanol. Although cellulosic ethanol is a
facncy idea, the energy balance does not shown significant energy gain (when
compared with solar energy, wind energy, hydrolic power as well as
pyrolysis of biomass). The cellulose should not be converted |
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s*******s
发帖数: 623 | 47 Job ID: GF2011A001
Posting Title: Research Scientist/Research Associate/Bacterial Geneticist
Brief Introduction of Gate Fuels Inc.: “Imagination, Innovation,
Implementation --- Enabled Technologies for a Green Clean World”
Gate Fuels Inc. is a research start-up firm based in Blacksburg, VA, with
the goal of developing microbial and cell-free platform technologies that
enable low-cost production of biochemicals and biofuels. The first platform
is based on industrially-safe Bacillus subtilis. Thi... 阅读全帖 |
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n******t
发帖数: 1281 | 48 Job ID: GF2013A001
Posting Title: Research Scientist/Research Associate/Bacterial Geneticist/
Fermentation Scientist
Brief Introduction of Gate Fuels Inc.: “Imagination, Innovation,
Implementation --- Enabled Technologies for a Green Clean World”
Gate Fuels Inc. is a research start-up firm based in Blacksburg, VA, with
the goal of developing microbial platform technologies that enable low-cost
production of biochemicals and biofuels. The platform is based on the well-
studied Gram-positive mode... 阅读全帖 |
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o*****e
发帖数: 2 | 49 【 以下文字转载自 NanoST 讨论区 】
发信人: oldcake (oldcake), 信区: NanoST
标 题: 请教：关于买原材料寄回中国
发信站: BBS 未名空间站 (Sat Jun 5 16:03:42 2010, 美东)
请教版上各位，有朋友托我在美国帮他买 Ethyl cellulose ethoce （ECT10），约十
公斤，寄回国内。我是外行，对这些东西不了解，不知道哪里可以买得到？同时也想知
道邮寄这些东西回中国会有问题吗？就是有没有什么规定不能这样做？
另外，我在google上找关于这种化学品的资料，Ethyl cellulose 是乙基钎维素，那
ethoce是什么？ECT10是Ethyl cellulose 某一种形态吗？
问的问题可能比较外行，但请大家帮忙，先谢了。 |
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s********r
发帖数: 536 | 50 第一篇
Turbak, A. F., Snyder, F. W., & Sandberg, K. R. (1983). Microfibrillated
cellulose, a new
cellulose product: Properties, uses, and commercial potential. Journal of
Applied
Polymer Science: Applied Polymer Symposium, 37, 815
第二篇
Herrick, F. W., Casebier, R. L., Hamilton, J. K., & Sandberg, K. R. (1983).
Microfibrillated
cellulose: Morphology and accessibility. Journal of Applied Polymer Science:
Applied Polymer Symposium, 37, 797–813. |
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