Catálogo de publicaciones - revistas

<jats:title>Growing polymer brushes from surfaces</jats:title> <jats:p> Surface functionalization is important in a broad range of fields. One approach involves polymer brushes, where polymer chains are grafted onto a surface. Cai <jats:italic>et al.</jats:italic> describe the nanoscale functionalization of surfaces by exploiting the living crystallization-driven self-assembly of polyferrocenyl-based block copolymers (see the Perspective by Presa Soto). Small crystalline cylindrical micelle seeds were attached using noncovalent bonds to a variety of surfaces, including silicon wafers, graphene oxide nanosheets, and gold. Addition of dissolved unimers over the seed-coated surfaces allowed micellar brushes to grow. Protonation and postdecoration with gold and silver nanoparticles demonstrated the applicability of such modified surfaces in catalysis, as antibacterial agents, and in separation processes. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6469" page="1095" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aax9075">1095</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6469" page="1078" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aay8350">1078</jats:related-article> </jats:p>

<jats:title>A sharp boundary in the cuprates</jats:title> <jats:p> Many physicists working on cuprate superconductors believe that the so-called strange metal phase in the cuprate phase diagram is associated with a quantum critical point. Within this picture, the quantum critical point gives rise to a V-shaped region in the doping-temperature phase diagram of the cuprates: the strange metal phase. Chen <jats:italic>et al.</jats:italic> used angle-resolved photoemission spectroscopy in the cuprate family Bi2212 to challenge this view. By taking comprehensive measurements as a function of doping and temperature—and making sure that the signal was not affected by environmental conditions—they found an incoherent strange metal phase that was sharply separated from a conventional phase by a temperature-independent vertical line in the phase diagram. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6469" page="1099" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aaw8850">1099</jats:related-article> </jats:p>

<jats:title>Marine observations with optics</jats:title> <jats:p> Placing sensors on the seafloor is difficult, but a sensor network has huge potential for observing processes occurring both below and above the seafloor. Lindsey <jats:italic>et al.</jats:italic> measured acoustic vibrations collected by attaching a laser to the Monterey Accelerated Research System's subsea optical fiber during a maintenance period (see the Perspective by Jousset). Acoustic waves were monitored by changes in laser light along the cable. The observations from just a few days allowed mapping of an unknown fault system and detection of several dynamic processes in the water column above. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6469" page="1103" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aay5881">1103</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6469" page="1076" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aaz7750">1076</jats:related-article> </jats:p>

<jats:title>Controlling quantum defects in graphene</jats:title> <jats:p> The development of quantum technologies relies on the ability to fabricate and engineer materials with robust quantum properties. The controlled introduction of defects in semiconductors is one of the most promising platforms under development. With the capability to precisely position point defects (five-membered rings) in the graphene honeycomb lattice, Lombardi <jats:italic>et al.</jats:italic> explored recent theoretical work suggesting that such defects should display enhanced quantum properties (see the Perspective by von Kugelgen and Freedman). The spin-bearing properties of the defects and the engineered control of their interactions open up exciting possibilities for graphene-based spintronics and quantum electronics. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6469" page="1107" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aay7203">1107</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6469" page="1070" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aaz4044">1070</jats:related-article> </jats:p>

<jats:title>Glimpsing an exchange of partners</jats:title> <jats:p> When two diatomic molecules collide, they can sometimes swap partners. For instance, two potassium-rubidium (KRb) molecules can produce K <jats:sub>2</jats:sub> and Rb <jats:sub>2</jats:sub> . The four-atom intermediate formed upon collision is typically too scarce and short-lived to spot, even using ultrafast techniques. Hu <jats:italic>et al.</jats:italic> circumvented this problem by studying the reaction at temperatures approaching 0 kelvin. Using a combination of mass spectrometry and velocity-map imaging, the authors directly characterized the ionized K <jats:sub>2</jats:sub> Rb <jats:sub>2</jats:sub> complex as well as the reactant and product populations. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6469" page="1111" related-article-type="in-this-issue" vol="366" xlink:href="10.1126/science.aay9531">1111</jats:related-article> </jats:p>