Photon Force-Induced Phase Transition Dynamics of Single Hydrogel Nanoparticles in Water
Photon Force-Induced Phase Transition Dynamics of Single Hydrogel Nanoparticles in Water
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水中单个水凝胶纳米颗粒的光子力诱导相变动力学
DOI：
10.12693/aphyspola.112.s-57
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发表时间：
2007
影响因子：
0.7
通讯作者：
H. Masuhara
中科院分区：
文献类型：
--
作者：
C. Hosokawa;Yuriko Matsumura;H. Yoshikawa;K. Iwai;H. Masuhara
用聚焦激光束捕获了极性敏感的荧光探针单体标记的（--异丙基丙烯酰胺）凝胶颗粒，并对其荧光动力学进行了分析。捕获的单个凝胶粒子的荧光强度随激光功率的增加而增加，而荧光峰波长不变。温度引起的单颗粒发光特性的变化与本体溶液的发光特性相似。考虑到荧光强度和荧光峰分别反映了荧光探针和附着（结合）水分子之间的局部相互作用以及由粒子中（自由）水含量决定的有效极性，可以很好地解释这些行为。激光捕集后荧光峰波长发生变化，并在几百秒内发生蓝移，表明单个凝胶颗粒在此时间尺度上逐渐达到球形状态，首先排出游离水分子，然后排出结合水分子。PACS编号：87.80.Cc，33.50.Dq，61.25.Hq，87.64。{t
--isopropylacrylamide) gel particles labeled with a polarity-sensitive °uores-cent probe monomer were optically trapped by a focused laser beam and its°uorescence dynamics was analyzed. The °uorescence intensity of trappedsingle gel particles was increased with the trapping laser power, while the °u-orescence peak wavelength was not changed. Temperature-induced changesof °uorescence properties of the single particle were conflrmed to be simi-lar to those of the bulk solution. These behaviors are well interpreted byconsidering that the °uorescence intensity and °uorescence peak re°ect lo-cal interactions between the °uorescent probe and attaching (bound) watermolecules and efiective polarity determined by (free) water content in theparticle, respectively. A change in the °uorescence peak wavelength afterlaser trapping was followed and its blue-shift was conflrmed to occur withina few hundreds seconds, indicating that a single gel particle gradually attainsto a globular state on this timescale, expelling initially free water moleculesand then bound ones.PACS numbers: 87.80.Cc, 33.50.Dq, 61.25.Hq, 87.64.{t
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DOI：
10.1021/jp044894b
发表时间：
2005-03
期刊：
The journal of physical chemistry. B
影响因子：
--
作者：
Yasuyuki Tsuboi;Masayuki Nishino;Tetsuya Sasaki;N. Kitamura
通讯作者：
Yasuyuki Tsuboi;Masayuki Nishino;Tetsuya Sasaki;N. Kitamura
DOI：
10.1021/jp0441184
发表时间：
2005-03
期刊：
The journal of physical chemistry. B
影响因子：
--
作者：
Sadahiro Masuo;H. Yoshikawa;H. Nothofer;A. Grimsdale;U. Scherf;K. Müllen;H. Masuhara
通讯作者：
Sadahiro Masuo;H. Yoshikawa;H. Nothofer;A. Grimsdale;U. Scherf;K. Müllen;H. Masuhara
通过聚焦激光束的辐射压力产生的聚（N-异丙基丙烯酰胺）微粒
DOI：
--
发表时间：
2005
期刊：
The Journal of Physical Chemistry B 109(印刷中)
影响因子：
--
作者：
K.Nishihara;A.Sasaki;T.Nishikawa;A.Sunahara;R.Hatakeyama;R.Hatakeyama;R.Hatakeyama;W.Oohara;G.Sato;W.Oohara;G.Sato;W.Oohara;R.Hatakeyama;坪井泰之;Y.Tsuboi et al.;Y.Tsuboi et al.;H.Yan et al.;Y.Tsuboi et al.;Y.Tsuboi
通讯作者：
Y.Tsuboi
影响因子：
2.4
作者：
Hosokawa, C;Yoshikawa, H;Masuhara, H
通讯作者：
Masuhara, H
影响因子：
2.4
作者：
Hosokawa, C;Yoshikawa, H;Masuhara, H
通讯作者：
Masuhara, H