| 查看: 873 | 回复: 5 | ||
| 本帖产生 1 个 翻译EPI ，点击这里进行查看 | ||
[求助]
求指点
|
||
| 在化学中，GM是什么单位，代表什么？比如in the range of 100-5400GM |
回复此楼» 猜你喜欢
带资进组求博导收留
已经有10人回复
-
最近几年招的学生写论文不引自己组发的文章
已经有11人回复
-
写了一篇“相变储能技术在冷库中应用”的论文，论文内容以实验为主，投什么期刊合适？
已经有4人回复
-
需要合成515-64-0，50g，能接单的留言
已经有3人回复
-
中科院杭州医学所招收博士生一名（生物分析化学、药物递送）
已经有3人回复
-
临港实验室与上科大联培博士招生1名
已经有8人回复
-
想换工作。大多数高校都是 评职称时 认可5年内在原单位取得的成果吗？
已经有4人回复
818james
铜虫 (著名写手)
- 翻译EPI: 140
- 应助: 59 (初中生)
- 金币: 7611.1
- 红花: 17
- 帖子: 1455
- 在线: 878.1小时
- 虫号: 3719023
- 注册: 2015-03-08
2楼2016-06-18 19:50:39
3楼2016-06-19 10:00:02
818james
铜虫 (著名写手)
- 翻译EPI: 140
- 应助: 59 (初中生)
- 金币: 7611.1
- 红花: 17
- 帖子: 1455
- 在线: 878.1小时
- 虫号: 3719023
- 注册: 2015-03-08
4楼2016-06-19 11:12:22
5楼2016-06-19 11:24:56
818james
铜虫 (著名写手)
- 翻译EPI: 140
- 应助: 59 (初中生)
- 金币: 7611.1
- 红花: 17
- 帖子: 1455
- 在线: 878.1小时
- 虫号: 3719023
- 注册: 2015-03-08
【答案】应助回帖
★ ★ ★ ★ ★
刘璐蓉123: 金币+5, 翻译EPI+1, ★★★很有帮助 2016-06-19 21:46:11
刘璐蓉123: 金币+5, 翻译EPI+1, ★★★很有帮助 2016-06-19 21:46:11
|
把你提供的话放到百度一搜，得到好几篇文章，其中一篇就清楚表明GM是什么（当然不是克了），你看看合你意吗。 Previously reported δ values for a limited number of conventional photoinitiators are on the order of or less than 10 Göppert Mayer (GM) units, where 1 GM = 10−50 cm4 s per photon [3]. 文章前面部分如下，你也可以自己去下下来仔细看看。 Two-photon absorption cross-sections of common photoinitiators Katherine J. Schafer a, Joel M. Hales b, Mihaela Balu b, Kevin D. Belfield a,b,∗, Eric W. Van Stryland b, David J. Hagan b a Department of Chemistry, University of Central Florida 4000 Central Florida Blvd., Orlando, FL 32826, USA b School of Optics/CREOL, University of Central Florida, Orlando, FL 32826, USA Received 26 June 2003; received in revised form 10 September 2003; accepted 22 September 2003 Abstract Recent interests in and applications of two-photon absorption (2PA) induced photopolymerization have afforded advanced opportunities to perform three-dimensionally resolved polymerization, resulting in intricate microfabrication and imaging. Many of the reported 2PA-induced polymerizations make use of commercially available photoinitiators, and a key parameter to consider is the two-photon absorption cross-section (δ) of the initiator. To date, there has been no comprehensive investigation of two-photon absorptivity of commercial photoinitiators, though a few studies presenting novel photoinitiators for two-photon polymerization have appeared. Herein, we report the 2PA properties of common, commercially available photoinitiators typically utilized in conventional radiation curing science and technologies, and often used in 2PA-based polymerizations. Z-scan and white-light continuum (WLC) pump–probe techniques were utilized to obtain two-photon absorption cross-sections (δ). The results for most compounds were found to yield good agreement between the two methods. Most of the photoinitiators studied possess low δ, except Irgacure OXE01, indicating a need for the development of new photoinitiators with improved properties optimized for 2PA applications. A compound prepared in our laboratories exhibits high 2PA and was useful as a two-photon free-radical photoinitiator. © 2004 Elsevier B.V. All rights reserved. Keywords: Two-photon absorption; Photoinitiators; Photopolymerization; Irgacure; Darocure 1. Introduction The process of two-photon absorption (2PA), applied to photopolymerization, is a method being examined for a number of advanced applications such as the production of intricate three-dimensional (3D) microstructures [1–3], high density optical data storage [4], and 3D integrated optical components [5–7]. Typical resins used for photopolymerization are often comprised of carefully selected photoinitiators, monomers and/or oligomers, photosensitizers or co-initiators, and various additives may often be included in the final composite system. Inherent in these photopolymerizable resin systems is the use of photoinitiators typically absorbing UV and/or visible radiation. Efforts in the synthesis and photochemical studies of novel photoinitiators with more desirable properties have been the subject of investigation for conventional UV-visible radiation curing technologies [8,9]. Conventional photoinitiators, however, often suffer from small 2PA cross-sections (δ) in the near-IR ∗ Corresponding author. Tel.: +1-407-823-1028; fax: +1-407-823-2252. E-mail address: kbelfiel@mail.ucf.edu (K.D. Belfield). wavelength range where femtosecond-lasers are typically used for 2PA-induced polymerization. Previously reported δ values for a limited number of conventional photoinitiators are on the order of or less than 10 Göppert Mayer (GM) units, where 1 GM = 10−50 cm4 s per photon [3]. Despite the low δ values, we have demonstrated the general utility of a wide variety of conventional photoinitiators for the 2PA polymerization of acrylate, epoxide, vinyl ether, and thiol-ene monomers [10–12]. In response to the low δ of commercially available photoinitiators, efforts have been made to prepare novel photoinitiators possessing higher 2PA cross-sections, with the expectation that larger δ values allow for lower laser powers and shorter irradiation time, resulting in minimal optical damage to materials [3,10,13]. It has also been suggested that a photoinitiator possessing high δ may allow the use of low-cost micro-lasers, of the same polymerization speed as that obtained with conventional femtosecond-lasers and commercial UV resins [14]. Efforts to produce novel photoinitiators with improved photosensitivity to near-IR radiation for 2PA polymerization are limited, and subject to tedious synthetic procedures. |
6楼2016-06-19 19:32:56